nanovg-agg backend

3rd/README.md

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+# 第三方库
+
+本目录放第三方库，并遵循下列原则：
+
+* PC上需要的软件包，可在本目录放完整的软件包。如SDL和gtest。
+* 嵌入式平台需要的软件包，只放需要的文件。这样在移植到新的平台时，要加哪些文件，一目了然。
+* 如果需要修改才能使用的第三方库，请将原始项目clone到zlgopen组织下进行修改，测试无误后再同步到AWTK中，同步之后请将所有平台都测试一遍。

3rd/agg/SConscript

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+import os
+
+env = DefaultEnvironment().Clone()
+LIB_DIR = os.environ['LIB_DIR'];
+BIN_DIR = os.environ['BIN_DIR'];
+
+SOURCES = Glob('src/*.cpp')
+env.Library(os.path.join(LIB_DIR, 'agg'), SOURCES);
+

3rd/agg/include/agg_basics.h

@@ -0,0 +1,560 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+
+#ifndef AGG_BASICS_INCLUDED
+#define AGG_BASICS_INCLUDED
+
+#include <math.h>
+#include "agg_config.h"
+
+//---------------------------------------------------------AGG_CUSTOM_ALLOCATOR
+#ifdef AGG_CUSTOM_ALLOCATOR
+#include "agg_allocator.h"
+#else
+namespace agg
+{
+    // The policy of all AGG containers and memory allocation strategy 
+    // in general is that no allocated data requires explicit construction.
+    // It means that the allocator can be really simple; you can even
+    // replace new/delete to malloc/free. The constructors and destructors 
+    // won't be called in this case, however everything will remain working. 
+    // The second argument of deallocate() is the size of the allocated 
+    // block. You can use this information if you wish.
+    //------------------------------------------------------------pod_allocator
+    template<class T> struct pod_allocator
+    {
+        static T*   allocate(unsigned num)       { return new T [num]; }
+        static void deallocate(T* ptr, unsigned) { delete [] ptr;      }
+    };
+
+    // Single object allocator. It's also can be replaced with your custom
+    // allocator. The difference is that it can only allocate a single 
+    // object and the constructor and destructor must be called. 
+    // In AGG there is no need to allocate an array of objects with
+    // calling their constructors (only single ones). So that, if you
+    // replace these new/delete to malloc/free make sure that the in-place
+    // new is called and take care of calling the destructor too.
+    //------------------------------------------------------------obj_allocator
+    template<class T> struct obj_allocator
+    {
+        static T*   allocate()         { return new T; }
+        static void deallocate(T* ptr) { delete ptr;   }
+    };
+}
+#endif
+
+
+//-------------------------------------------------------- Default basic types
+//
+// If the compiler has different capacity of the basic types you can redefine
+// them via the compiler command line or by generating agg_config.h that is
+// empty by default.
+//
+#ifndef AGG_INT8
+#define AGG_INT8 signed char
+#endif
+
+#ifndef AGG_INT8U
+#define AGG_INT8U unsigned char
+#endif
+
+#ifndef AGG_INT16
+#define AGG_INT16 short
+#endif
+
+#ifndef AGG_INT16U
+#define AGG_INT16U unsigned short
+#endif
+
+#ifndef AGG_INT32
+#define AGG_INT32 int
+#endif
+
+#ifndef AGG_INT32U
+#define AGG_INT32U unsigned
+#endif
+
+#ifndef AGG_INT64
+#if defined(_MSC_VER) || defined(__BORLANDC__)
+#define AGG_INT64 signed __int64
+#else
+#define AGG_INT64 signed long long
+#endif
+#endif
+
+#ifndef AGG_INT64U
+#if defined(_MSC_VER) || defined(__BORLANDC__)
+#define AGG_INT64U unsigned __int64
+#else
+#define AGG_INT64U unsigned long long
+#endif
+#endif
+
+//------------------------------------------------ Some fixes for MS Visual C++
+#if defined(_MSC_VER)
+#pragma warning(disable:4786) // Identifier was truncated...
+#endif
+
+#if defined(_MSC_VER)
+#define AGG_INLINE __forceinline
+#else
+#define AGG_INLINE inline
+#endif
+
+namespace agg
+{
+    //-------------------------------------------------------------------------
+    typedef AGG_INT8   int8;         //----int8
+    typedef AGG_INT8U  int8u;        //----int8u
+    typedef AGG_INT16  int16;        //----int16
+    typedef AGG_INT16U int16u;       //----int16u
+    typedef AGG_INT32  int32;        //----int32
+    typedef AGG_INT32U int32u;       //----int32u
+    typedef AGG_INT64  int64;        //----int64
+    typedef AGG_INT64U int64u;       //----int64u
+
+#if defined(AGG_FISTP)
+#pragma warning(push)
+#pragma warning(disable : 4035) //Disable warning "no return value"
+    AGG_INLINE int iround(double v)              //-------iround
+    {
+        int t;
+        __asm fld   qword ptr [v]
+        __asm fistp dword ptr [t]
+        __asm mov eax, dword ptr [t]
+    }
+    AGG_INLINE unsigned uround(double v)         //-------uround
+    {
+        unsigned t;
+        __asm fld   qword ptr [v]
+        __asm fistp dword ptr [t]
+        __asm mov eax, dword ptr [t]
+    }
+#pragma warning(pop)
+    AGG_INLINE int ifloor(double v)
+    {
+        return int(floor(v));
+    }
+    AGG_INLINE unsigned ufloor(double v)         //-------ufloor
+    {
+        return unsigned(floor(v));
+    }
+    AGG_INLINE int iceil(double v)
+    {
+        return int(ceil(v));
+    }
+    AGG_INLINE unsigned uceil(double v)          //--------uceil
+    {
+        return unsigned(ceil(v));
+    }
+#elif defined(AGG_QIFIST)
+    AGG_INLINE int iround(double v)
+    {
+        return int(v);
+    }
+    AGG_INLINE int uround(double v)
+    {
+        return unsigned(v);
+    }
+    AGG_INLINE int ifloor(double v)
+    {
+        return int(floor(v));
+    }
+    AGG_INLINE unsigned ufloor(double v)
+    {
+        return unsigned(floor(v));
+    }
+    AGG_INLINE int iceil(double v)
+    {
+        return int(ceil(v));
+    }
+    AGG_INLINE unsigned uceil(double v)
+    {
+        return unsigned(ceil(v));
+    }
+#else
+    AGG_INLINE int iround(double v)
+    {
+        return int((v < 0.0) ? v - 0.5 : v + 0.5);
+    }
+    AGG_INLINE int uround(double v)
+    {
+        return unsigned(v + 0.5);
+    }
+    AGG_INLINE int ifloor(double v)
+    {
+        int i = int(v);
+        return i - (i > v);
+    }
+    AGG_INLINE unsigned ufloor(double v)
+    {
+        return unsigned(v);
+    }
+    AGG_INLINE int iceil(double v)
+    {
+        return int(ceil(v));
+    }
+    AGG_INLINE unsigned uceil(double v)
+    {
+        return unsigned(ceil(v));
+    }
+#endif
+
+    //---------------------------------------------------------------saturation
+    template<int Limit> struct saturation
+    {
+        AGG_INLINE static int iround(double v)
+        {
+            if(v < double(-Limit)) return -Limit;
+            if(v > double( Limit)) return  Limit;
+            return agg::iround(v);
+        }
+    };
+
+    //------------------------------------------------------------------mul_one
+    template<unsigned Shift> struct mul_one
+    {
+        AGG_INLINE static unsigned mul(unsigned a, unsigned b)
+        {
+            unsigned q = a * b + (1 << (Shift-1));
+            return (q + (q >> Shift)) >> Shift;
+        }
+    };
+
+    //-------------------------------------------------------------------------
+    typedef unsigned char cover_type;    //----cover_type
+    enum cover_scale_e
+    {
+        cover_shift = 8,                 //----cover_shift
+        cover_size  = 1 << cover_shift,  //----cover_size 
+        cover_mask  = cover_size - 1,    //----cover_mask 
+        cover_none  = 0,                 //----cover_none 
+        cover_full  = cover_mask         //----cover_full 
+    };
+
+    //----------------------------------------------------poly_subpixel_scale_e
+    // These constants determine the subpixel accuracy, to be more precise, 
+    // the number of bits of the fractional part of the coordinates. 
+    // The possible coordinate capacity in bits can be calculated by formula:
+    // sizeof(int) * 8 - poly_subpixel_shift, i.e, for 32-bit integers and
+    // 8-bits fractional part the capacity is 24 bits.
+    enum poly_subpixel_scale_e
+    {
+        poly_subpixel_shift = 8,                      //----poly_subpixel_shift
+        poly_subpixel_scale = 1<<poly_subpixel_shift, //----poly_subpixel_scale 
+        poly_subpixel_mask  = poly_subpixel_scale-1   //----poly_subpixel_mask 
+    };
+
+    //----------------------------------------------------------filling_rule_e
+    enum filling_rule_e
+    {
+        fill_non_zero,
+        fill_even_odd
+    };
+
+    //-----------------------------------------------------------------------pi
+    const double pi = 3.14159265358979323846;
+
+    //------------------------------------------------------------------deg2rad
+    inline double deg2rad(double deg)
+    {
+        return deg * pi / 180.0;
+    }
+
+    //------------------------------------------------------------------rad2deg
+    inline double rad2deg(double rad)
+    {
+        return rad * 180.0 / pi;
+    }
+ 
+    //----------------------------------------------------------------rect_base
+    template<class T> struct rect_base
+    {
+        typedef T            value_type;
+        typedef rect_base<T> self_type;
+        T x1, y1, x2, y2;
+
+        rect_base() {}
+        rect_base(T x1_, T y1_, T x2_, T y2_) :
+            x1(x1_), y1(y1_), x2(x2_), y2(y2_) {}
+
+        void init(T x1_, T y1_, T x2_, T y2_) 
+        {
+            x1 = x1_; y1 = y1_; x2 = x2_; y2 = y2_; 
+        }
+
+        const self_type& normalize()
+        {
+            T t;
+            if(x1 > x2) { t = x1; x1 = x2; x2 = t; }
+            if(y1 > y2) { t = y1; y1 = y2; y2 = t; }
+            return *this;
+        }
+
+        bool clip(const self_type& r)
+        {
+            if(x2 > r.x2) x2 = r.x2;
+            if(y2 > r.y2) y2 = r.y2;
+            if(x1 < r.x1) x1 = r.x1;
+            if(y1 < r.y1) y1 = r.y1;
+            return x1 <= x2 && y1 <= y2;
+        }
+
+        bool is_valid() const
+        {
+            return x1 <= x2 && y1 <= y2;
+        }
+
+        bool hit_test(T x, T y) const
+        {
+            return (x >= x1 && x <= x2 && y >= y1 && y <= y2);
+        }
+        
+        bool overlaps(const self_type& r) const
+        {
+            return !(r.x1 > x2 || r.x2 < x1
+                  || r.y1 > y2 || r.y2 < y1);
+        }
+    };
+
+    //-----------------------------------------------------intersect_rectangles
+    template<class Rect> 
+    inline Rect intersect_rectangles(const Rect& r1, const Rect& r2)
+    {
+        Rect r = r1;
+
+        // First process x2,y2 because the other order 
+        // results in Internal Compiler Error under 
+        // Microsoft Visual C++ .NET 2003 69462-335-0000007-18038 in 
+        // case of "Maximize Speed" optimization option.
+        //-----------------
+        if(r.x2 > r2.x2) r.x2 = r2.x2; 
+        if(r.y2 > r2.y2) r.y2 = r2.y2;
+        if(r.x1 < r2.x1) r.x1 = r2.x1;
+        if(r.y1 < r2.y1) r.y1 = r2.y1;
+        return r;
+    }
+
+
+    //---------------------------------------------------------unite_rectangles
+    template<class Rect> 
+    inline Rect unite_rectangles(const Rect& r1, const Rect& r2)
+    {
+        Rect r = r1;
+        if(r.x2 < r2.x2) r.x2 = r2.x2;
+        if(r.y2 < r2.y2) r.y2 = r2.y2;
+        if(r.x1 > r2.x1) r.x1 = r2.x1;
+        if(r.y1 > r2.y1) r.y1 = r2.y1;
+        return r;
+    }
+
+    typedef rect_base<int>    rect_i; //----rect_i
+    typedef rect_base<float>  rect_f; //----rect_f
+    typedef rect_base<double> rect_d; //----rect_d
+
+    //---------------------------------------------------------path_commands_e
+    enum path_commands_e
+    {
+        path_cmd_stop     = 0,        //----path_cmd_stop    
+        path_cmd_move_to  = 1,        //----path_cmd_move_to 
+        path_cmd_line_to  = 2,        //----path_cmd_line_to 
+        path_cmd_curve3   = 3,        //----path_cmd_curve3  
+        path_cmd_curve4   = 4,        //----path_cmd_curve4  
+        path_cmd_curveN   = 5,        //----path_cmd_curveN
+        path_cmd_catrom   = 6,        //----path_cmd_catrom
+        path_cmd_ubspline = 7,        //----path_cmd_ubspline
+        path_cmd_end_poly = 0x0F,     //----path_cmd_end_poly
+        path_cmd_mask     = 0x0F      //----path_cmd_mask    
+    };
+
+    //------------------------------------------------------------path_flags_e
+    enum path_flags_e
+    {
+        path_flags_none  = 0,         //----path_flags_none 
+        path_flags_ccw   = 0x10,      //----path_flags_ccw  
+        path_flags_cw    = 0x20,      //----path_flags_cw   
+        path_flags_close = 0x40,      //----path_flags_close
+        path_flags_mask  = 0xF0       //----path_flags_mask 
+    };
+
+    //---------------------------------------------------------------is_vertex
+    inline bool is_vertex(unsigned c)
+    {
+        return c >= path_cmd_move_to && c < path_cmd_end_poly;
+    }
+
+    //--------------------------------------------------------------is_drawing
+    inline bool is_drawing(unsigned c)
+    {
+        return c >= path_cmd_line_to && c < path_cmd_end_poly;
+    }
+
+    //-----------------------------------------------------------------is_stop
+    inline bool is_stop(unsigned c)
+    { 
+        return c == path_cmd_stop;
+    }
+
+    //--------------------------------------------------------------is_move_to
+    inline bool is_move_to(unsigned c)
+    {
+        return c == path_cmd_move_to;
+    }
+
+    //--------------------------------------------------------------is_line_to
+    inline bool is_line_to(unsigned c)
+    {
+        return c == path_cmd_line_to;
+    }
+
+    //----------------------------------------------------------------is_curve
+    inline bool is_curve(unsigned c)
+    {
+        return c == path_cmd_curve3 || c == path_cmd_curve4;
+    }
+
+    //---------------------------------------------------------------is_curve3
+    inline bool is_curve3(unsigned c)
+    {
+        return c == path_cmd_curve3;
+    }
+
+    //---------------------------------------------------------------is_curve4
+    inline bool is_curve4(unsigned c)
+    {
+        return c == path_cmd_curve4;
+    }
+
+    //-------------------------------------------------------------is_end_poly
+    inline bool is_end_poly(unsigned c)
+    {
+        return (c & path_cmd_mask) == path_cmd_end_poly;
+    }
+
+    //----------------------------------------------------------------is_close
+    inline bool is_close(unsigned c)
+    {
+        return (c & ~(path_flags_cw | path_flags_ccw)) ==
+               (path_cmd_end_poly | path_flags_close); 
+    }
+
+    //------------------------------------------------------------is_next_poly
+    inline bool is_next_poly(unsigned c)
+    {
+        return is_stop(c) || is_move_to(c) || is_end_poly(c);
+    }
+
+    //-------------------------------------------------------------------is_cw
+    inline bool is_cw(unsigned c)
+    {
+        return (c & path_flags_cw) != 0;
+    }
+
+    //------------------------------------------------------------------is_ccw
+    inline bool is_ccw(unsigned c)
+    {
+        return (c & path_flags_ccw) != 0;
+    }
+
+    //-------------------------------------------------------------is_oriented
+    inline bool is_oriented(unsigned c)
+    {
+        return (c & (path_flags_cw | path_flags_ccw)) != 0; 
+    }
+
+    //---------------------------------------------------------------is_closed
+    inline bool is_closed(unsigned c)
+    {
+        return (c & path_flags_close) != 0; 
+    }
+
+    //----------------------------------------------------------get_close_flag
+    inline unsigned get_close_flag(unsigned c)
+    {
+        return c & path_flags_close; 
+    }
+
+    //-------------------------------------------------------clear_orientation
+    inline unsigned clear_orientation(unsigned c)
+    {
+        return c & ~(path_flags_cw | path_flags_ccw);
+    }
+
+    //---------------------------------------------------------get_orientation
+    inline unsigned get_orientation(unsigned c)
+    {
+        return c & (path_flags_cw | path_flags_ccw);
+    }
+
+    //---------------------------------------------------------set_orientation
+    inline unsigned set_orientation(unsigned c, unsigned o)
+    {
+        return clear_orientation(c) | o;
+    }
+
+    //--------------------------------------------------------------point_base
+    template<class T> struct point_base
+    {
+        typedef T value_type;
+        T x,y;
+        point_base() {}
+        point_base(T x_, T y_) : x(x_), y(y_) {}
+    };
+    typedef point_base<int>    point_i; //-----point_i
+    typedef point_base<float>  point_f; //-----point_f
+    typedef point_base<double> point_d; //-----point_d
+
+    //-------------------------------------------------------------vertex_base
+    template<class T> struct vertex_base
+    {
+        typedef T value_type;
+        T x,y;
+        unsigned cmd;
+        vertex_base() {}
+        vertex_base(T x_, T y_, unsigned cmd_) : x(x_), y(y_), cmd(cmd_) {}
+    };
+    typedef vertex_base<int>    vertex_i; //-----vertex_i
+    typedef vertex_base<float>  vertex_f; //-----vertex_f
+    typedef vertex_base<double> vertex_d; //-----vertex_d
+
+    //----------------------------------------------------------------row_info
+    template<class T> struct row_info
+    {
+        int x1, x2;
+        T* ptr;
+        row_info() {}
+        row_info(int x1_, int x2_, T* ptr_) : x1(x1_), x2(x2_), ptr(ptr_) {}
+    };
+
+    //----------------------------------------------------------const_row_info
+    template<class T> struct const_row_info
+    {
+        int x1, x2;
+        const T* ptr;
+        const_row_info() {}
+        const_row_info(int x1_, int x2_, const T* ptr_) : 
+            x1(x1_), x2(x2_), ptr(ptr_) {}
+    };
+
+    //------------------------------------------------------------is_equal_eps
+    template<class T> inline bool is_equal_eps(T v1, T v2, T epsilon)
+    {
+        return fabs(v1 - v2) <= double(epsilon);
+    }
+}
+
+
+#endif
+

3rd/agg/include/agg_clip_liang_barsky.h

@@ -0,0 +1,333 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// Liang-Barsky clipping 
+//
+//----------------------------------------------------------------------------
+#ifndef AGG_CLIP_LIANG_BARSKY_INCLUDED
+#define AGG_CLIP_LIANG_BARSKY_INCLUDED
+
+#include "agg_basics.h"
+
+namespace agg
+{
+
+    //------------------------------------------------------------------------
+    enum clipping_flags_e
+    {
+        clipping_flags_x1_clipped = 4,
+        clipping_flags_x2_clipped = 1,
+        clipping_flags_y1_clipped = 8,
+        clipping_flags_y2_clipped = 2,
+        clipping_flags_x_clipped = clipping_flags_x1_clipped | clipping_flags_x2_clipped,
+        clipping_flags_y_clipped = clipping_flags_y1_clipped | clipping_flags_y2_clipped
+    };
+
+    //----------------------------------------------------------clipping_flags
+    // Determine the clipping code of the vertex according to the 
+    // Cyrus-Beck line clipping algorithm
+    //
+    //        |        |
+    //  0110  |  0010  | 0011
+    //        |        |
+    // -------+--------+-------- clip_box.y2
+    //        |        |
+    //  0100  |  0000  | 0001
+    //        |        |
+    // -------+--------+-------- clip_box.y1
+    //        |        |
+    //  1100  |  1000  | 1001
+    //        |        |
+    //  clip_box.x1  clip_box.x2
+    //
+    // 
+    template<class T>
+    inline unsigned clipping_flags(T x, T y, const rect_base<T>& clip_box)
+    {
+        return  (x > clip_box.x2) |
+               ((y > clip_box.y2) << 1) |
+               ((x < clip_box.x1) << 2) |
+               ((y < clip_box.y1) << 3);
+    }
+
+    //--------------------------------------------------------clipping_flags_x
+    template<class T>
+    inline unsigned clipping_flags_x(T x, const rect_base<T>& clip_box)
+    {
+        return  (x > clip_box.x2) | ((x < clip_box.x1) << 2);
+    }
+
+
+    //--------------------------------------------------------clipping_flags_y
+    template<class T>
+    inline unsigned clipping_flags_y(T y, const rect_base<T>& clip_box)
+    {
+        return ((y > clip_box.y2) << 1) | ((y < clip_box.y1) << 3);
+    }
+
+
+    //-------------------------------------------------------clip_liang_barsky
+    template<class T>
+    inline unsigned clip_liang_barsky(T x1, T y1, T x2, T y2,
+                                      const rect_base<T>& clip_box,
+                                      T* x, T* y)
+    {
+        const double nearzero = 1e-30;
+
+        double deltax = x2 - x1;
+        double deltay = y2 - y1; 
+        double xin;
+        double xout;
+        double yin;
+        double yout;
+        double tinx;
+        double tiny;
+        double toutx;
+        double touty;  
+        double tin1;
+        double tin2;
+        double tout1;
+        unsigned np = 0;
+
+        if(deltax == 0.0) 
+        {   
+            // bump off of the vertical
+            deltax = (x1 > clip_box.x1) ? -nearzero : nearzero;
+        }
+
+        if(deltay == 0.0) 
+        { 
+            // bump off of the horizontal 
+            deltay = (y1 > clip_box.y1) ? -nearzero : nearzero;
+        }
+        
+        if(deltax > 0.0) 
+        {                
+            // points to right
+            xin  = clip_box.x1;
+            xout = clip_box.x2;
+        }
+        else 
+        {
+            xin  = clip_box.x2;
+            xout = clip_box.x1;
+        }
+
+        if(deltay > 0.0) 
+        {
+            // points up
+            yin  = clip_box.y1;
+            yout = clip_box.y2;
+        }
+        else 
+        {
+            yin  = clip_box.y2;
+            yout = clip_box.y1;
+        }
+        
+        tinx = (xin - x1) / deltax;
+        tiny = (yin - y1) / deltay;
+        
+        if (tinx < tiny) 
+        {
+            // hits x first
+            tin1 = tinx;
+            tin2 = tiny;
+        }
+        else
+        {
+            // hits y first
+            tin1 = tiny;
+            tin2 = tinx;
+        }
+        
+        if(tin1 <= 1.0) 
+        {
+            if(0.0 < tin1) 
+            {
+                *x++ = (T)xin;
+                *y++ = (T)yin;
+                ++np;
+            }
+
+            if(tin2 <= 1.0)
+            {
+                toutx = (xout - x1) / deltax;
+                touty = (yout - y1) / deltay;
+                
+                tout1 = (toutx < touty) ? toutx : touty;
+                
+                if(tin2 > 0.0 || tout1 > 0.0) 
+                {
+                    if(tin2 <= tout1) 
+                    {
+                        if(tin2 > 0.0) 
+                        {
+                            if(tinx > tiny) 
+                            {
+                                *x++ = (T)xin;
+                                *y++ = (T)(y1 + tinx * deltay);
+                            }
+                            else 
+                            {
+                                *x++ = (T)(x1 + tiny * deltax);
+                                *y++ = (T)yin;
+                            }
+                            ++np;
+                        }
+
+                        if(tout1 < 1.0) 
+                        {
+                            if(toutx < touty) 
+                            {
+                                *x++ = (T)xout;
+                                *y++ = (T)(y1 + toutx * deltay);
+                            }
+                            else 
+                            {
+                                *x++ = (T)(x1 + touty * deltax);
+                                *y++ = (T)yout;
+                            }
+                        }
+                        else 
+                        {
+                            *x++ = x2;
+                            *y++ = y2;
+                        }
+                        ++np;
+                    }
+                    else 
+                    {
+                        if(tinx > tiny) 
+                        {
+                            *x++ = (T)xin;
+                            *y++ = (T)yout;
+                        }
+                        else 
+                        {
+                            *x++ = (T)xout;
+                            *y++ = (T)yin;
+                        }
+                        ++np;
+                    }
+                }
+            }
+        }
+        return np;
+    }
+
+
+    //----------------------------------------------------------------------------
+    template<class T>
+    bool clip_move_point(T x1, T y1, T x2, T y2, 
+                         const rect_base<T>& clip_box, 
+                         T* x, T* y, unsigned flags)
+    {
+       T bound;
+
+       if(flags & clipping_flags_x_clipped)
+       {
+           if(x1 == x2)
+           {
+               return false;
+           }
+           bound = (flags & clipping_flags_x1_clipped) ? clip_box.x1 : clip_box.x2;
+           *y = (T)(double(bound - x1) * (y2 - y1) / (x2 - x1) + y1);
+           *x = bound;
+       }
+
+       flags = clipping_flags_y(*y, clip_box);
+       if(flags & clipping_flags_y_clipped)
+       {
+           if(y1 == y2)
+           {
+               return false;
+           }
+           bound = (flags & clipping_flags_y1_clipped) ? clip_box.y1 : clip_box.y2;
+           *x = (T)(double(bound - y1) * (x2 - x1) / (y2 - y1) + x1);
+           *y = bound;
+       }
+       return true;
+    }
+
+    //-------------------------------------------------------clip_line_segment
+    // Returns: ret >= 4        - Fully clipped
+    //          (ret & 1) != 0  - First point has been moved
+    //          (ret & 2) != 0  - Second point has been moved
+    //
+    template<class T>
+    unsigned clip_line_segment(T* x1, T* y1, T* x2, T* y2,
+                               const rect_base<T>& clip_box)
+    {
+        unsigned f1 = clipping_flags(*x1, *y1, clip_box);
+        unsigned f2 = clipping_flags(*x2, *y2, clip_box);
+        unsigned ret = 0;
+
+        if((f2 | f1) == 0)
+        {
+            // Fully visible
+            return 0;
+        }
+
+        if((f1 & clipping_flags_x_clipped) != 0 && 
+           (f1 & clipping_flags_x_clipped) == (f2 & clipping_flags_x_clipped))
+        {
+            // Fully clipped
+            return 4;
+        }
+
+        if((f1 & clipping_flags_y_clipped) != 0 && 
+           (f1 & clipping_flags_y_clipped) == (f2 & clipping_flags_y_clipped))
+        {
+            // Fully clipped
+            return 4;
+        }
+
+        T tx1 = *x1;
+        T ty1 = *y1;
+        T tx2 = *x2;
+        T ty2 = *y2;
+        if(f1) 
+        {   
+            if(!clip_move_point(tx1, ty1, tx2, ty2, clip_box, x1, y1, f1)) 
+            {
+                return 4;
+            }
+            if(*x1 == *x2 && *y1 == *y2) 
+            {
+                return 4;
+            }
+            ret |= 1;
+        }
+        if(f2) 
+        {
+            if(!clip_move_point(tx1, ty1, tx2, ty2, clip_box, x2, y2, f2))
+            {
+                return 4;
+            }
+            if(*x1 == *x2 && *y1 == *y2) 
+            {
+                return 4;
+            }
+            ret |= 2;
+        }
+        return ret;
+    }
+
+
+}
+
+
+#endif

3rd/agg/include/agg_config.h

@@ -0,0 +1,44 @@
+#ifndef AGG_CONFIG_INCLUDED
+#define AGG_CONFIG_INCLUDED
+
+// This file can be used to redefine certain data types.
+
+//---------------------------------------
+// 1. Default basic types such as:
+// 
+// AGG_INT8
+// AGG_INT8U
+// AGG_INT16
+// AGG_INT16U
+// AGG_INT32
+// AGG_INT32U
+// AGG_INT64
+// AGG_INT64U
+//
+// Just replace this file with new defines if necessary. 
+// For example, if your compiler doesn't have a 64 bit integer type
+// you can still use AGG if you define the follows:
+//
+// #define AGG_INT64  int
+// #define AGG_INT64U unsigned
+//
+// It will result in overflow in 16 bit-per-component image/pattern resampling
+// but it won't result any crash and the rest of the library will remain 
+// fully functional.
+
+
+//---------------------------------------
+// 2. Default rendering_buffer type. Can be:
+//
+// Provides faster access for massive pixel operations, 
+// such as blur, image filtering:
+// #define AGG_RENDERING_BUFFER row_ptr_cache<int8u>
+// 
+// Provides cheaper creation and destruction (no mem allocs):
+// #define AGG_RENDERING_BUFFER row_accessor<int8u>
+//
+// You can still use both of them simultaneously in your applications 
+// This #define is used only for default rendering_buffer type,
+// in short hand typedefs like pixfmt_rgba32.
+
+#endif

3rd/agg/include/agg_conv_adaptor_vcgen.h

@@ -0,0 +1,157 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+
+#ifndef AGG_CONV_ADAPTOR_VCGEN_INCLUDED
+#define AGG_CONV_ADAPTOR_VCGEN_INCLUDED
+
+#include "agg_basics.h"
+
+namespace agg
+{
+    //------------------------------------------------------------null_markers
+    struct null_markers
+    {
+        void remove_all() {}
+        void add_vertex(double, double, unsigned) {}
+        void prepare_src() {}
+
+        void rewind(unsigned) {}
+        unsigned vertex(double*, double*) { return path_cmd_stop; }
+    };
+
+
+    //------------------------------------------------------conv_adaptor_vcgen
+    template<class VertexSource, 
+             class Generator, 
+             class Markers=null_markers> class conv_adaptor_vcgen
+    {
+        enum status
+        {
+            initial,
+            accumulate,
+            generate
+        };
+
+    public:
+        explicit conv_adaptor_vcgen(VertexSource& source) :
+            m_source(&source), 
+            m_status(initial)
+        {}
+        void attach(VertexSource& source) { m_source = &source; }
+
+        Generator& generator() { return m_generator; }
+        const Generator& generator() const { return m_generator; }
+
+        Markers& markers() { return m_markers; }
+        const Markers& markers() const { return m_markers; }
+        
+        void rewind(unsigned path_id) 
+        { 
+            m_source->rewind(path_id); 
+            m_status = initial;
+        }
+
+        unsigned vertex(double* x, double* y);
+
+    private:
+        // Prohibit copying
+        conv_adaptor_vcgen(const conv_adaptor_vcgen<VertexSource, Generator, Markers>&);
+        const conv_adaptor_vcgen<VertexSource, Generator, Markers>& 
+            operator = (const conv_adaptor_vcgen<VertexSource, Generator, Markers>&);
+
+        VertexSource* m_source;
+        Generator     m_generator;
+        Markers       m_markers;
+        status        m_status;
+        unsigned      m_last_cmd;
+        double        m_start_x;
+        double        m_start_y;
+    };
+
+
+
+
+
+    //------------------------------------------------------------------------
+    template<class VertexSource, class Generator, class Markers> 
+    unsigned conv_adaptor_vcgen<VertexSource, Generator, Markers>::vertex(double* x, double* y)
+    {
+        unsigned cmd = path_cmd_stop;
+        bool done = false;
+        while(!done)
+        {
+            switch(m_status)
+            {
+            case initial:
+                m_markers.remove_all();
+                m_last_cmd = m_source->vertex(&m_start_x, &m_start_y);
+                m_status = accumulate;
+
+            case accumulate:
+                if(is_stop(m_last_cmd)) return path_cmd_stop;
+
+                m_generator.remove_all();
+                m_generator.add_vertex(m_start_x, m_start_y, path_cmd_move_to);
+                m_markers.add_vertex(m_start_x, m_start_y, path_cmd_move_to);
+
+                for(;;)
+                {
+                    cmd = m_source->vertex(x, y);
+                    if(is_vertex(cmd))
+                    {
+                        m_last_cmd = cmd;
+                        if(is_move_to(cmd))
+                        {
+                            m_start_x = *x;
+                            m_start_y = *y;
+                            break;
+                        }
+                        m_generator.add_vertex(*x, *y, cmd);
+                        m_markers.add_vertex(*x, *y, path_cmd_line_to);
+                    }
+                    else
+                    {
+                        if(is_stop(cmd))
+                        {
+                            m_last_cmd = path_cmd_stop;
+                            break;
+                        }
+                        if(is_end_poly(cmd))
+                        {
+                            m_generator.add_vertex(*x, *y, cmd);
+                            break;
+                        }
+                    }
+                }
+                m_generator.rewind(0);
+                m_status = generate;
+
+            case generate:
+                cmd = m_generator.vertex(x, y);
+                if(is_stop(cmd))
+                {
+                    m_status = accumulate;
+                    break;
+                }
+                done = true;
+                break;
+            }
+        }
+        return cmd;
+    }
+
+}
+
+#endif

3rd/agg/include/agg_conv_stroke.h

@@ -0,0 +1,73 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// conv_stroke
+//
+//----------------------------------------------------------------------------
+#ifndef AGG_CONV_STROKE_INCLUDED
+#define AGG_CONV_STROKE_INCLUDED
+
+#include "agg_basics.h"
+#include "agg_vcgen_stroke.h"
+#include "agg_conv_adaptor_vcgen.h"
+
+namespace agg
+{
+
+    //-------------------------------------------------------------conv_stroke
+    template<class VertexSource, class Markers=null_markers> 
+    struct conv_stroke : 
+    public conv_adaptor_vcgen<VertexSource, vcgen_stroke, Markers>
+    {
+        typedef Markers marker_type;
+        typedef conv_adaptor_vcgen<VertexSource, vcgen_stroke, Markers> base_type;
+
+        conv_stroke(VertexSource& vs) : 
+            conv_adaptor_vcgen<VertexSource, vcgen_stroke, Markers>(vs)
+        {
+        }
+
+        void line_cap(line_cap_e lc)     { base_type::generator().line_cap(lc);  }
+        void line_join(line_join_e lj)   { base_type::generator().line_join(lj); }
+        void inner_join(inner_join_e ij) { base_type::generator().inner_join(ij); }
+
+        line_cap_e   line_cap()   const { return base_type::generator().line_cap();  }
+        line_join_e  line_join()  const { return base_type::generator().line_join(); }
+        inner_join_e inner_join() const { return base_type::generator().inner_join(); }
+
+        void width(double w) { base_type::generator().width(w); }
+        void miter_limit(double ml) { base_type::generator().miter_limit(ml); }
+        void miter_limit_theta(double t) { base_type::generator().miter_limit_theta(t); }
+        void inner_miter_limit(double ml) { base_type::generator().inner_miter_limit(ml); }
+        void approximation_scale(double as) { base_type::generator().approximation_scale(as); }
+
+        double width() const { return base_type::generator().width(); }
+        double miter_limit() const { return base_type::generator().miter_limit(); }
+        double inner_miter_limit() const { return base_type::generator().inner_miter_limit(); }
+        double approximation_scale() const { return base_type::generator().approximation_scale(); }
+
+        void shorten(double s) { base_type::generator().shorten(s); }
+        double shorten() const { return base_type::generator().shorten(); }
+
+    private:
+       conv_stroke(const conv_stroke<VertexSource, Markers>&);
+       const conv_stroke<VertexSource, Markers>& 
+           operator = (const conv_stroke<VertexSource, Markers>&);
+
+    };
+
+}
+
+#endif

3rd/agg/include/agg_dda_line.h

@@ -0,0 +1,290 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// classes dda_line_interpolator, dda2_line_interpolator
+//
+//----------------------------------------------------------------------------
+
+#ifndef AGG_DDA_LINE_INCLUDED
+#define AGG_DDA_LINE_INCLUDED
+
+#include <stdlib.h>
+#include "agg_basics.h"
+
+namespace agg
+{
+
+    //===================================================dda_line_interpolator
+    template<int FractionShift, int YShift=0> class dda_line_interpolator
+    {
+    public:
+        //--------------------------------------------------------------------
+        dda_line_interpolator() {}
+
+        //--------------------------------------------------------------------
+        dda_line_interpolator(int y1, int y2, unsigned count) :
+            m_y(y1),
+            m_inc(((y2 - y1) << FractionShift) / int(count)),
+            m_dy(0)
+        {
+        }
+
+        //--------------------------------------------------------------------
+        void operator ++ ()
+        {
+            m_dy += m_inc;
+        }
+
+        //--------------------------------------------------------------------
+        void operator -- ()
+        {
+            m_dy -= m_inc;
+        }
+
+        //--------------------------------------------------------------------
+        void operator += (unsigned n)
+        {
+            m_dy += m_inc * n;
+        }
+
+        //--------------------------------------------------------------------
+        void operator -= (unsigned n)
+        {
+            m_dy -= m_inc * n;
+        }
+
+
+        //--------------------------------------------------------------------
+        int y()  const { return m_y + (m_dy >> (FractionShift-YShift)); }
+        int dy() const { return m_dy; }
+
+
+    private:
+        int m_y;
+        int m_inc;
+        int m_dy;
+    };
+
+
+
+
+
+    //=================================================dda2_line_interpolator
+    class dda2_line_interpolator
+    {
+    public:
+        typedef int save_data_type;
+        enum save_size_e { save_size = 2 };
+
+        //--------------------------------------------------------------------
+        dda2_line_interpolator() {}
+
+        //-------------------------------------------- Forward-adjusted line
+        dda2_line_interpolator(int y1, int y2, int count) :
+            m_cnt(count <= 0 ? 1 : count),
+            m_lft((y2 - y1) / m_cnt),
+            m_rem((y2 - y1) % m_cnt),
+            m_mod(m_rem),
+            m_y(y1)
+        {
+            if(m_mod <= 0)
+            {
+                m_mod += count;
+                m_rem += count;
+                m_lft--;
+            }
+            m_mod -= count;
+        }
+
+        //-------------------------------------------- Backward-adjusted line
+        dda2_line_interpolator(int y1, int y2, int count, int) :
+            m_cnt(count <= 0 ? 1 : count),
+            m_lft((y2 - y1) / m_cnt),
+            m_rem((y2 - y1) % m_cnt),
+            m_mod(m_rem),
+            m_y(y1)
+        {
+            if(m_mod <= 0)
+            {
+                m_mod += count;
+                m_rem += count;
+                m_lft--;
+            }
+        }
+
+        //-------------------------------------------- Backward-adjusted line
+        dda2_line_interpolator(int y, int count) :
+            m_cnt(count <= 0 ? 1 : count),
+            m_lft(y / m_cnt),
+            m_rem(y % m_cnt),
+            m_mod(m_rem),
+            m_y(0)
+        {
+            if(m_mod <= 0)
+            {
+                m_mod += count;
+                m_rem += count;
+                m_lft--;
+            }
+        }
+
+
+        //--------------------------------------------------------------------
+        void save(save_data_type* data) const
+        {
+            data[0] = m_mod;
+            data[1] = m_y;
+        }
+
+        //--------------------------------------------------------------------
+        void load(const save_data_type* data)
+        {
+            m_mod = data[0];
+            m_y   = data[1];
+        }
+
+        //--------------------------------------------------------------------
+        void operator++()
+        {
+            m_mod += m_rem;
+            m_y += m_lft;
+            if(m_mod > 0)
+            {
+                m_mod -= m_cnt;
+                m_y++;
+            }
+        }
+
+        //--------------------------------------------------------------------
+        void operator--()
+        {
+            if(m_mod <= m_rem)
+            {
+                m_mod += m_cnt;
+                m_y--;
+            }
+            m_mod -= m_rem;
+            m_y -= m_lft;
+        }
+
+        //--------------------------------------------------------------------
+        void adjust_forward()
+        {
+            m_mod -= m_cnt;
+        }
+
+        //--------------------------------------------------------------------
+        void adjust_backward()
+        {
+            m_mod += m_cnt;
+        }
+
+        //--------------------------------------------------------------------
+        int mod() const { return m_mod; }
+        int rem() const { return m_rem; }
+        int lft() const { return m_lft; }
+
+        //--------------------------------------------------------------------
+        int y() const { return m_y; }
+
+    private:
+        int m_cnt;
+        int m_lft;
+        int m_rem;
+        int m_mod;
+        int m_y;
+    };
+
+
+
+
+
+
+
+    //---------------------------------------------line_bresenham_interpolator
+    class line_bresenham_interpolator
+    {
+    public:
+        enum subpixel_scale_e
+        {
+            subpixel_shift = 8,
+            subpixel_scale = 1 << subpixel_shift,
+            subpixel_mask  = subpixel_scale - 1
+        };
+
+        //--------------------------------------------------------------------
+        static int line_lr(int v) { return v >> subpixel_shift; }
+
+        //--------------------------------------------------------------------
+        line_bresenham_interpolator(int x1, int y1, int x2, int y2) :
+            m_x1_lr(line_lr(x1)),
+            m_y1_lr(line_lr(y1)),
+            m_x2_lr(line_lr(x2)),
+            m_y2_lr(line_lr(y2)),
+            m_ver(abs(m_x2_lr - m_x1_lr) < abs(m_y2_lr - m_y1_lr)),
+            m_len(m_ver ? abs(m_y2_lr - m_y1_lr) : 
+                          abs(m_x2_lr - m_x1_lr)),
+            m_inc(m_ver ? ((y2 > y1) ? 1 : -1) : ((x2 > x1) ? 1 : -1)),
+            m_interpolator(m_ver ? x1 : y1, 
+                           m_ver ? x2 : y2, 
+                           m_len)
+        {
+        }
+    
+        //--------------------------------------------------------------------
+        bool     is_ver() const { return m_ver; }
+        unsigned len()    const { return m_len; }
+        int      inc()    const { return m_inc; }
+
+        //--------------------------------------------------------------------
+        void hstep()
+        {
+            ++m_interpolator;
+            m_x1_lr += m_inc;
+        }
+
+        //--------------------------------------------------------------------
+        void vstep()
+        {
+            ++m_interpolator;
+            m_y1_lr += m_inc;
+        }
+
+        //--------------------------------------------------------------------
+        int x1() const { return m_x1_lr; }
+        int y1() const { return m_y1_lr; }
+        int x2() const { return line_lr(m_interpolator.y()); }
+        int y2() const { return line_lr(m_interpolator.y()); }
+        int x2_hr() const { return m_interpolator.y(); }
+        int y2_hr() const { return m_interpolator.y(); }
+
+    private:
+        int                    m_x1_lr;
+        int                    m_y1_lr;
+        int                    m_x2_lr;
+        int                    m_y2_lr;
+        bool                   m_ver;
+        unsigned               m_len;
+        int                    m_inc;
+        dda2_line_interpolator m_interpolator;
+
+    };
+
+
+}
+
+
+
+#endif

3rd/agg/include/agg_gamma_functions.h

@@ -0,0 +1,132 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+
+#ifndef AGG_GAMMA_FUNCTIONS_INCLUDED
+#define AGG_GAMMA_FUNCTIONS_INCLUDED
+
+#include <math.h>
+#include "agg_basics.h"
+
+namespace agg
+{
+    //===============================================================gamma_none
+    struct gamma_none
+    {
+        double operator()(double x) const { return x; }
+    };
+
+
+    //==============================================================gamma_power
+    class gamma_power
+    {
+    public:
+        gamma_power() : m_gamma(1.0) {}
+        gamma_power(double g) : m_gamma(g) {}
+
+        void gamma(double g) { m_gamma = g; }
+        double gamma() const { return m_gamma; }
+
+        double operator() (double x) const
+        {
+            return pow(x, m_gamma);
+        }
+
+    private:
+        double m_gamma;
+    };
+
+
+    //==========================================================gamma_threshold
+    class gamma_threshold
+    {
+    public:
+        gamma_threshold() : m_threshold(0.5) {}
+        gamma_threshold(double t) : m_threshold(t) {}
+
+        void threshold(double t) { m_threshold = t; }
+        double threshold() const { return m_threshold; }
+
+        double operator() (double x) const
+        {
+            return (x < m_threshold) ? 0.0 : 1.0;
+        }
+
+    private:
+        double m_threshold;
+    };
+
+
+    //============================================================gamma_linear
+    class gamma_linear
+    {
+    public:
+        gamma_linear() : m_start(0.0), m_end(1.0) {}
+        gamma_linear(double s, double e) : m_start(s), m_end(e) {}
+
+        void set(double s, double e) { m_start = s; m_end = e; }
+        void start(double s) { m_start = s; }
+        void end(double e) { m_end = e; }
+        double start() const { return m_start; }
+        double end() const { return m_end; }
+
+        double operator() (double x) const
+        {
+            if(x < m_start) return 0.0;
+            if(x > m_end) return 1.0;
+            return (x - m_start) / (m_end - m_start);
+        }
+
+    private:
+        double m_start;
+        double m_end;
+    };
+
+
+    //==========================================================gamma_multiply
+    class gamma_multiply
+    {
+    public:
+        gamma_multiply() : m_mul(1.0) {}
+        gamma_multiply(double v) : m_mul(v) {}
+
+        void value(double v) { m_mul = v; }
+        double value() const { return m_mul; }
+
+        double operator() (double x) const
+        {
+            double y = x * m_mul;
+            if(y > 1.0) y = 1.0;
+            return y;
+        }
+
+    private:
+        double m_mul;
+    };
+
+    inline double sRGB_to_linear(double x)
+    {
+        return (x <= 0.04045) ? (x / 12.92) : pow((x + 0.055) / (1.055), 2.4);
+    }
+
+    inline double linear_to_sRGB(double x)
+    {
+        return (x <= 0.0031308) ? (x * 12.92) : (1.055 * pow(x, 1 / 2.4) - 0.055);
+    }
+}
+
+#endif
+
+
+

3rd/agg/include/agg_gamma_lut.h

@@ -0,0 +1,300 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+
+#ifndef AGG_GAMMA_LUT_INCLUDED
+#define AGG_GAMMA_LUT_INCLUDED
+
+#include <math.h>
+#include "agg_basics.h"
+#include "agg_gamma_functions.h"
+
+namespace agg
+{
+    template<class LoResT=int8u, 
+             class HiResT=int8u, 
+             unsigned GammaShift=8, 
+             unsigned HiResShift=8> class gamma_lut
+    {
+    public:
+        typedef gamma_lut<LoResT, HiResT, GammaShift, HiResShift> self_type;
+
+        enum gamma_scale_e
+        {
+            gamma_shift = GammaShift,
+            gamma_size  = 1 << gamma_shift,
+            gamma_mask  = gamma_size - 1
+        };
+
+        enum hi_res_scale_e
+        {
+            hi_res_shift = HiResShift,
+            hi_res_size  = 1 << hi_res_shift,
+            hi_res_mask  = hi_res_size - 1
+        };
+
+        ~gamma_lut()
+        {
+            pod_allocator<LoResT>::deallocate(m_inv_gamma, hi_res_size);
+            pod_allocator<HiResT>::deallocate(m_dir_gamma, gamma_size);
+        }
+
+        gamma_lut() : 
+            m_gamma(1.0), 
+            m_dir_gamma(pod_allocator<HiResT>::allocate(gamma_size)),
+            m_inv_gamma(pod_allocator<LoResT>::allocate(hi_res_size))
+        {
+            unsigned i;
+            for(i = 0; i < gamma_size; i++)
+            {
+                m_dir_gamma[i] = HiResT(i << (hi_res_shift - gamma_shift));
+            }
+
+            for(i = 0; i < hi_res_size; i++)
+            {
+                m_inv_gamma[i] = LoResT(i >> (hi_res_shift - gamma_shift));
+            }
+        }
+
+        gamma_lut(double g) :
+            m_gamma(1.0), 
+            m_dir_gamma(pod_allocator<HiResT>::allocate(gamma_size)),
+            m_inv_gamma(pod_allocator<LoResT>::allocate(hi_res_size))
+        {
+            gamma(g);
+        }
+
+        void gamma(double g) 
+        {
+            m_gamma = g;
+
+            unsigned i;
+            for(i = 0; i < gamma_size; i++)
+            {
+                m_dir_gamma[i] = (HiResT)
+                    uround(pow(i / double(gamma_mask), m_gamma) * double(hi_res_mask));
+            }
+
+            double inv_g = 1.0 / g;
+            for(i = 0; i < hi_res_size; i++)
+            {
+                m_inv_gamma[i] = (LoResT)
+                    uround(pow(i / double(hi_res_mask), inv_g) * double(gamma_mask));
+            }
+        }
+
+        double gamma() const
+        {
+            return m_gamma;
+        }
+
+        HiResT dir(LoResT v) const 
+        { 
+            return m_dir_gamma[unsigned(v)]; 
+        }
+
+        LoResT inv(HiResT v) const 
+        { 
+            return m_inv_gamma[unsigned(v)];
+        }
+
+    private:
+        gamma_lut(const self_type&);
+        const self_type& operator = (const self_type&);
+
+        double m_gamma;
+        HiResT* m_dir_gamma;
+        LoResT* m_inv_gamma;
+    };
+
+    //
+    // sRGB support classes
+    //
+
+    // sRGB_lut - implements sRGB conversion for the various types.
+    // Base template is undefined, specializations are provided below.
+    template<class LinearType>
+    class sRGB_lut;
+
+    template<>
+    class sRGB_lut<float>
+    {
+    public:
+		sRGB_lut()
+		{
+			// Generate lookup tables.
+			for (int i = 0; i <= 255; ++i)
+			{
+				m_dir_table[i] = float(sRGB_to_linear(i / 255.0));
+			}
+			for (int i = 0; i <= 65535; ++i)
+			{
+				m_inv_table[i] = uround(255.0 * linear_to_sRGB(i / 65535.0));
+			}
+		}
+
+		float dir(int8u v) const
+		{
+			return m_dir_table[v];
+		}
+
+		int8u inv(float v) const
+		{
+			return m_inv_table[int16u(0.5 + v * 65535)];
+		}
+
+	private:
+		float m_dir_table[256];
+		int8u m_inv_table[65536];
+    };
+
+    template<>
+    class sRGB_lut<int16u>
+    {
+    public:
+        sRGB_lut()
+        {
+            // Generate lookup tables.
+            for (int i = 0; i <= 255; ++i)
+            {
+                m_dir_table[i] = uround(65535.0 * sRGB_to_linear(i / 255.0));
+            }
+			for (int i = 0; i <= 65535; ++i)
+			{
+				m_inv_table[i] = uround(255.0 * linear_to_sRGB(i / 65535.0));
+			}
+		}
+
+		int16u dir(int8u v) const
+		{
+			return m_dir_table[v];
+		}
+
+		int8u inv(int16u v) const
+		{
+			return m_inv_table[v];
+		}
+
+	private:
+		int16u m_dir_table[256];
+		int8u m_inv_table[65536];
+	};
+
+    template<>
+    class sRGB_lut<int8u>
+    {
+    public:
+        sRGB_lut()
+        {
+            // Generate lookup tables. 
+            for (int i = 0; i <= 255; ++i)
+            {
+                m_dir_table[i] = uround(255.0 * sRGB_to_linear(i / 255.0));
+                m_inv_table[i] = uround(255.0 * linear_to_sRGB(i / 255.0));
+            }
+        }
+
+		int8u dir(int8u v) const
+		{
+			return m_dir_table[v];
+		}
+
+		int8u inv(int8u v) const
+        {
+            return m_inv_table[v];
+        }
+
+	private:
+		int8u m_dir_table[256];
+		int8u m_inv_table[256];
+	};
+
+    // Common base class for sRGB_conv objects. Defines an internal 
+    // sRGB_lut object so that users don't have to.
+    template<class T>
+    class sRGB_conv_base
+    {
+    public:
+        static T rgb_from_sRGB(int8u x)
+        {
+            return lut.dir(x);
+        }
+
+        static int8u rgb_to_sRGB(T x)
+        {
+            return lut.inv(x);
+        }
+
+    private:
+        static sRGB_lut<T> lut;
+    };
+
+    // Definition of sRGB_conv_base::lut. Due to the fact that this a template, 
+    // we don't need to place the definition in a cpp file. Hurrah.
+    template<class T>
+    sRGB_lut<T> sRGB_conv_base<T>::lut;
+
+    // Wrapper for sRGB-linear conversion. 
+    // Base template is undefined, specializations are provided below.
+    template<class T>
+    class sRGB_conv;
+
+    template<>
+    class sRGB_conv<float> : public sRGB_conv_base<float>
+    {
+    public:
+        static float alpha_from_sRGB(int8u x)
+        {
+			static const double y = 1 / 255.0;
+            return float(x * y);
+        }
+
+        static int8u alpha_to_sRGB(float x)
+        {
+            return int8u(0.5 + x * 255);
+        }
+    };
+
+    template<>
+    class sRGB_conv<int16u> : public sRGB_conv_base<int16u>
+    {
+    public:
+        static int16u alpha_from_sRGB(int8u x)
+        {
+            return (x << 8) | x;
+        }
+
+        static int8u alpha_to_sRGB(int16u x)
+        {
+            return x >> 8;
+        }
+    };
+
+    template<>
+    class sRGB_conv<int8u> : public sRGB_conv_base<int8u>
+    {
+    public:
+        static int8u alpha_from_sRGB(int8u x)
+        {
+            return x;
+        }
+
+        static int8u alpha_to_sRGB(int8u x)
+        {
+            return x;
+        }
+    };
+}
+
+#endif

3rd/agg/include/agg_image_accessors.h

@@ -0,0 +1,481 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+
+#ifndef AGG_IMAGE_ACCESSORS_INCLUDED
+#define AGG_IMAGE_ACCESSORS_INCLUDED
+
+#include "agg_basics.h"
+
+namespace agg
+{
+
+    //-----------------------------------------------------image_accessor_clip
+    template<class PixFmt> class image_accessor_clip
+    {
+    public:
+        typedef PixFmt   pixfmt_type;
+        typedef typename pixfmt_type::color_type color_type;
+        typedef typename pixfmt_type::order_type order_type;
+        typedef typename pixfmt_type::value_type value_type;
+        enum pix_width_e { pix_width = pixfmt_type::pix_width };
+
+        image_accessor_clip() {}
+        explicit image_accessor_clip(pixfmt_type& pixf, 
+                                     const color_type& bk) : 
+            m_pixf(&pixf)
+        {
+            pixfmt_type::make_pix(m_bk_buf, bk);
+        }
+
+        void attach(pixfmt_type& pixf)
+        {
+            m_pixf = &pixf;
+        }
+
+        void background_color(const color_type& bk)
+        {
+            pixfmt_type::make_pix(m_bk_buf, bk);
+        }
+
+    private:
+        AGG_INLINE const int8u* pixel() const
+        {
+            if(m_y >= 0 && m_y < (int)m_pixf->height() &&
+               m_x >= 0 && m_x < (int)m_pixf->width())
+            {
+                return m_pixf->pix_ptr(m_x, m_y);
+            }
+            return m_bk_buf;
+        }
+
+    public:
+        AGG_INLINE const int8u* span(int x, int y, unsigned len)
+        {
+            m_x = m_x0 = x;
+            m_y = y;
+            if(y >= 0 && y < (int)m_pixf->height() &&
+               x >= 0 && x+(int)len <= (int)m_pixf->width())
+            {
+                return m_pix_ptr = m_pixf->pix_ptr(x, y);
+            }
+            m_pix_ptr = 0;
+            return pixel();
+        }
+
+        AGG_INLINE const int8u* next_x()
+        {
+            if(m_pix_ptr) return m_pix_ptr += pix_width;
+            ++m_x;
+            return pixel();
+        }
+
+        AGG_INLINE const int8u* next_y()
+        {
+            ++m_y;
+            m_x = m_x0;
+            if(m_pix_ptr && 
+               m_y >= 0 && m_y < (int)m_pixf->height())
+            {
+                return m_pix_ptr = m_pixf->pix_ptr(m_x, m_y);
+            }
+            m_pix_ptr = 0;
+            return pixel();
+        }
+
+    private:
+        const pixfmt_type* m_pixf;
+        int8u              m_bk_buf[pix_width];
+        int                m_x, m_x0, m_y;
+        const int8u*       m_pix_ptr;
+    };
+
+
+
+
+    //--------------------------------------------------image_accessor_no_clip
+    template<class PixFmt> class image_accessor_no_clip
+    {
+    public:
+        typedef PixFmt   pixfmt_type;
+        typedef typename pixfmt_type::color_type color_type;
+        typedef typename pixfmt_type::order_type order_type;
+        typedef typename pixfmt_type::value_type value_type;
+        enum pix_width_e { pix_width = pixfmt_type::pix_width };
+
+        image_accessor_no_clip() {}
+        explicit image_accessor_no_clip(pixfmt_type& pixf) : 
+            m_pixf(&pixf) 
+        {}
+
+        void attach(pixfmt_type& pixf)
+        {
+            m_pixf = &pixf;
+        }
+
+        AGG_INLINE const int8u* span(int x, int y, unsigned)
+        {
+            m_x = x;
+            m_y = y;
+            return m_pix_ptr = m_pixf->pix_ptr(x, y);
+        }
+
+        AGG_INLINE const int8u* next_x()
+        {
+            return m_pix_ptr += pix_width;
+        }
+
+        AGG_INLINE const int8u* next_y()
+        {
+            ++m_y;
+            return m_pix_ptr = m_pixf->pix_ptr(m_x, m_y);
+        }
+
+    private:
+        const pixfmt_type* m_pixf;
+        int                m_x, m_y;
+        const int8u*       m_pix_ptr;
+    };
+
+
+
+
+    //----------------------------------------------------image_accessor_clone
+    template<class PixFmt> class image_accessor_clone
+    {
+    public:
+        typedef PixFmt   pixfmt_type;
+        typedef typename pixfmt_type::color_type color_type;
+        typedef typename pixfmt_type::order_type order_type;
+        typedef typename pixfmt_type::value_type value_type;
+        enum pix_width_e { pix_width = pixfmt_type::pix_width };
+
+        image_accessor_clone() {}
+        explicit image_accessor_clone(pixfmt_type& pixf) : 
+            m_pixf(&pixf) 
+        {}
+
+        void attach(pixfmt_type& pixf)
+        {
+            m_pixf = &pixf;
+        }
+
+    private:
+        AGG_INLINE const int8u* pixel() const
+        {
+            int x = m_x;
+            int y = m_y;
+            if(x < 0) x = 0;
+            if(y < 0) y = 0;
+            if(x >= (int)m_pixf->width())  x = m_pixf->width() - 1;
+            if(y >= (int)m_pixf->height()) y = m_pixf->height() - 1;
+            return m_pixf->pix_ptr(x, y);
+        }
+
+    public:
+        AGG_INLINE const int8u* span(int x, int y, unsigned len)
+        {
+            m_x = m_x0 = x;
+            m_y = y;
+            if(y >= 0 && y < (int)m_pixf->height() &&
+               x >= 0 && x+len <= (int)m_pixf->width())
+            {
+                return m_pix_ptr = m_pixf->pix_ptr(x, y);
+            }
+            m_pix_ptr = 0;
+            return pixel();
+        }
+
+        AGG_INLINE const int8u* next_x()
+        {
+            if(m_pix_ptr) return m_pix_ptr += pix_width;
+            ++m_x;
+            return pixel();
+        }
+
+        AGG_INLINE const int8u* next_y()
+        {
+            ++m_y;
+            m_x = m_x0;
+            if(m_pix_ptr && 
+               m_y >= 0 && m_y < (int)m_pixf->height())
+            {
+                return m_pix_ptr = m_pixf->pix_ptr(m_x, m_y);
+            }
+            m_pix_ptr = 0;
+            return pixel();
+        }
+
+    private:
+        const pixfmt_type* m_pixf;
+        int                m_x, m_x0, m_y;
+        const int8u*       m_pix_ptr;
+    };
+
+
+
+
+
+    //-----------------------------------------------------image_accessor_wrap
+    template<class PixFmt, class WrapX, class WrapY> class image_accessor_wrap
+    {
+    public:
+        typedef PixFmt   pixfmt_type;
+        typedef typename pixfmt_type::color_type color_type;
+        typedef typename pixfmt_type::order_type order_type;
+        typedef typename pixfmt_type::value_type value_type;
+        enum pix_width_e { pix_width = pixfmt_type::pix_width };
+
+        image_accessor_wrap() {}
+        explicit image_accessor_wrap(pixfmt_type& pixf) : 
+            m_pixf(&pixf), 
+            m_wrap_x(pixf.width()), 
+            m_wrap_y(pixf.height())
+        {}
+
+        void attach(pixfmt_type& pixf)
+        {
+            m_pixf = &pixf;
+        }
+
+        AGG_INLINE const int8u* span(int x, int y, unsigned)
+        {
+            m_x = x;
+            m_row_ptr = m_pixf->pix_ptr(0, m_wrap_y(y));
+            return m_row_ptr + m_wrap_x(x) * pix_width;
+        }
+
+        AGG_INLINE const int8u* next_x()
+        {
+            int x = ++m_wrap_x;
+            return m_row_ptr + x * pix_width;
+        }
+
+        AGG_INLINE const int8u* next_y()
+        {
+            m_row_ptr = m_pixf->pix_ptr(0, ++m_wrap_y);
+            return m_row_ptr + m_wrap_x(m_x) * pix_width;
+        }
+
+    private:
+        const pixfmt_type* m_pixf;
+        const int8u*       m_row_ptr;
+        int                m_x;
+        WrapX              m_wrap_x;
+        WrapY              m_wrap_y;
+    };
+
+
+
+
+    //--------------------------------------------------------wrap_mode_repeat
+    class wrap_mode_repeat
+    {
+    public:
+        wrap_mode_repeat() {}
+        wrap_mode_repeat(unsigned size) : 
+            m_size(size), 
+            m_add(size * (0x3FFFFFFF / size)),
+            m_value(0)
+        {}
+
+        AGG_INLINE unsigned operator() (int v)
+        { 
+            return m_value = (unsigned(v) + m_add) % m_size; 
+        }
+
+        AGG_INLINE unsigned operator++ ()
+        {
+            ++m_value;
+            if(m_value >= m_size) m_value = 0;
+            return m_value;
+        }
+    private:
+        unsigned m_size;
+        unsigned m_add;
+        unsigned m_value;
+    };
+
+
+    //---------------------------------------------------wrap_mode_repeat_pow2
+    class wrap_mode_repeat_pow2
+    {
+    public:
+        wrap_mode_repeat_pow2() {}
+        wrap_mode_repeat_pow2(unsigned size) : m_value(0)
+        {
+            m_mask = 1;
+            while(m_mask < size) m_mask = (m_mask << 1) | 1;
+            m_mask >>= 1;
+        }
+        AGG_INLINE unsigned operator() (int v)
+        { 
+            return m_value = unsigned(v) & m_mask;
+        }
+        AGG_INLINE unsigned operator++ ()
+        {
+            ++m_value;
+            if(m_value > m_mask) m_value = 0;
+            return m_value;
+        }
+    private:
+        unsigned m_mask;
+        unsigned m_value;
+    };
+
+
+    //----------------------------------------------wrap_mode_repeat_auto_pow2
+    class wrap_mode_repeat_auto_pow2
+    {
+    public:
+        wrap_mode_repeat_auto_pow2() {}
+        wrap_mode_repeat_auto_pow2(unsigned size) :
+            m_size(size),
+            m_add(size * (0x3FFFFFFF / size)),
+            m_mask((m_size & (m_size-1)) ? 0 : m_size-1),
+            m_value(0)
+        {}
+
+        AGG_INLINE unsigned operator() (int v) 
+        { 
+            if(m_mask) return m_value = unsigned(v) & m_mask;
+            return m_value = (unsigned(v) + m_add) % m_size;
+        }
+        AGG_INLINE unsigned operator++ ()
+        {
+            ++m_value;
+            if(m_value >= m_size) m_value = 0;
+            return m_value;
+        }
+
+    private:
+        unsigned m_size;
+        unsigned m_add;
+        unsigned m_mask;
+        unsigned m_value;
+    };
+
+
+    //-------------------------------------------------------wrap_mode_reflect
+    class wrap_mode_reflect
+    {
+    public:
+        wrap_mode_reflect() {}
+        wrap_mode_reflect(unsigned size) : 
+            m_size(size), 
+            m_size2(size * 2),
+            m_add(m_size2 * (0x3FFFFFFF / m_size2)),
+            m_value(0)
+        {}
+
+        AGG_INLINE unsigned operator() (int v)
+        { 
+            m_value = (unsigned(v) + m_add) % m_size2;
+            if(m_value >= m_size) return m_size2 - m_value - 1;
+            return m_value;
+        }
+
+        AGG_INLINE unsigned operator++ ()
+        {
+            ++m_value;
+            if(m_value >= m_size2) m_value = 0;
+            if(m_value >= m_size) return m_size2 - m_value - 1;
+            return m_value;
+        }
+    private:
+        unsigned m_size;
+        unsigned m_size2;
+        unsigned m_add;
+        unsigned m_value;
+    };
+
+
+
+    //--------------------------------------------------wrap_mode_reflect_pow2
+    class wrap_mode_reflect_pow2
+    {
+    public:
+        wrap_mode_reflect_pow2() {}
+        wrap_mode_reflect_pow2(unsigned size) : m_value(0)
+        {
+            m_mask = 1;
+            m_size = 1;
+            while(m_mask < size) 
+            {
+                m_mask = (m_mask << 1) | 1;
+                m_size <<= 1;
+            }
+        }
+        AGG_INLINE unsigned operator() (int v)
+        { 
+            m_value = unsigned(v) & m_mask;
+            if(m_value >= m_size) return m_mask - m_value;
+            return m_value;
+        }
+        AGG_INLINE unsigned operator++ ()
+        {
+            ++m_value;
+            m_value &= m_mask;
+            if(m_value >= m_size) return m_mask - m_value;
+            return m_value;
+        }
+    private:
+        unsigned m_size;
+        unsigned m_mask;
+        unsigned m_value;
+    };
+
+
+
+    //---------------------------------------------wrap_mode_reflect_auto_pow2
+    class wrap_mode_reflect_auto_pow2
+    {
+    public:
+        wrap_mode_reflect_auto_pow2() {}
+        wrap_mode_reflect_auto_pow2(unsigned size) :
+            m_size(size),
+            m_size2(size * 2),
+            m_add(m_size2 * (0x3FFFFFFF / m_size2)),
+            m_mask((m_size2 & (m_size2-1)) ? 0 : m_size2-1),
+            m_value(0)
+        {}
+
+        AGG_INLINE unsigned operator() (int v) 
+        { 
+            m_value = m_mask ? unsigned(v) & m_mask : 
+                              (unsigned(v) + m_add) % m_size2;
+            if(m_value >= m_size) return m_size2 - m_value - 1;
+            return m_value;            
+        }
+        AGG_INLINE unsigned operator++ ()
+        {
+            ++m_value;
+            if(m_value >= m_size2) m_value = 0;
+            if(m_value >= m_size) return m_size2 - m_value - 1;
+            return m_value;
+        }
+
+    private:
+        unsigned m_size;
+        unsigned m_size2;
+        unsigned m_add;
+        unsigned m_mask;
+        unsigned m_value;
+    };
+
+
+}
+
+
+#endif

3rd/agg/include/agg_image_filters.h

@@ -0,0 +1,448 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// Image transformation filters,
+// Filtering classes (image_filter_lut, image_filter),
+// Basic filter shape classes
+//----------------------------------------------------------------------------
+#ifndef AGG_IMAGE_FILTERS_INCLUDED
+#define AGG_IMAGE_FILTERS_INCLUDED
+
+#include "agg_array.h"
+#include "agg_math.h"
+
+namespace agg
+{
+
+    // See Implementation agg_image_filters.cpp 
+
+    enum image_filter_scale_e
+    {
+        image_filter_shift = 14,                      //----image_filter_shift
+        image_filter_scale = 1 << image_filter_shift, //----image_filter_scale 
+        image_filter_mask  = image_filter_scale - 1   //----image_filter_mask 
+    };
+
+    enum image_subpixel_scale_e
+    {
+        image_subpixel_shift = 8,                         //----image_subpixel_shift
+        image_subpixel_scale = 1 << image_subpixel_shift, //----image_subpixel_scale 
+        image_subpixel_mask  = image_subpixel_scale - 1   //----image_subpixel_mask 
+    };
+
+
+    //-----------------------------------------------------image_filter_lut
+    class image_filter_lut
+    {
+    public:
+        template<class FilterF> void calculate(const FilterF& filter,
+                                               bool normalization=true)
+        {
+            double r = filter.radius();
+            realloc_lut(r);
+            unsigned i;
+            unsigned pivot = diameter() << (image_subpixel_shift - 1);
+            for(i = 0; i < pivot; i++)
+            {
+                double x = double(i) / double(image_subpixel_scale);
+                double y = filter.calc_weight(x);
+                m_weight_array[pivot + i] = 
+                m_weight_array[pivot - i] = (int16)iround(y * image_filter_scale);
+            }
+            unsigned end = (diameter() << image_subpixel_shift) - 1;
+            m_weight_array[0] = m_weight_array[end];
+            if(normalization) 
+            {
+                normalize();
+            }
+        }
+
+        image_filter_lut() : m_radius(0), m_diameter(0), m_start(0) {}
+
+        template<class FilterF> image_filter_lut(const FilterF& filter, 
+                                                 bool normalization=true)
+        {
+            calculate(filter, normalization);
+        }
+
+        double       radius()       const { return m_radius;   }
+        unsigned     diameter()     const { return m_diameter; }
+        int          start()        const { return m_start;    }
+        const int16* weight_array() const { return &m_weight_array[0]; }
+        void         normalize();
+
+    private:
+        void realloc_lut(double radius);
+        image_filter_lut(const image_filter_lut&);
+        const image_filter_lut& operator = (const image_filter_lut&);
+
+        double           m_radius;
+        unsigned         m_diameter;
+        int              m_start;
+        pod_array<int16> m_weight_array;
+    };
+
+
+
+    //--------------------------------------------------------image_filter
+    template<class FilterF> class image_filter : public image_filter_lut
+    {
+    public:
+        image_filter()
+        {
+            calculate(m_filter_function);
+        }
+    private:
+        FilterF m_filter_function;
+    };
+
+
+    //-----------------------------------------------image_filter_bilinear
+    struct image_filter_bilinear
+    {
+        static double radius() { return 1.0; }
+        static double calc_weight(double x)
+        {
+            return 1.0 - x;
+        }
+    };
+
+
+    //-----------------------------------------------image_filter_hanning
+    struct image_filter_hanning
+    {
+        static double radius() { return 1.0; }
+        static double calc_weight(double x)
+        {
+            return 0.5 + 0.5 * cos(pi * x);
+        }
+    };
+
+
+    //-----------------------------------------------image_filter_hamming
+    struct image_filter_hamming
+    {
+        static double radius() { return 1.0; }
+        static double calc_weight(double x)
+        {
+            return 0.54 + 0.46 * cos(pi * x);
+        }
+    };
+
+    //-----------------------------------------------image_filter_hermite
+    struct image_filter_hermite
+    {
+        static double radius() { return 1.0; }
+        static double calc_weight(double x)
+        {
+            return (2.0 * x - 3.0) * x * x + 1.0;
+        }
+    };
+   
+    //------------------------------------------------image_filter_quadric
+    struct image_filter_quadric
+    {
+        static double radius() { return 1.5; }
+        static double calc_weight(double x)
+        {
+            double t;
+            if(x <  0.5) return 0.75 - x * x;
+            if(x <  1.5) {t = x - 1.5; return 0.5 * t * t;}
+            return 0.0;
+        }
+    };
+
+    //------------------------------------------------image_filter_bicubic
+    class image_filter_bicubic
+    {
+        static double pow3(double x)
+        {
+            return (x <= 0.0) ? 0.0 : x * x * x;
+        }
+
+    public:
+        static double radius() { return 2.0; }
+        static double calc_weight(double x)
+        {
+            return
+                (1.0/6.0) * 
+                (pow3(x + 2) - 4 * pow3(x + 1) + 6 * pow3(x) - 4 * pow3(x - 1));
+        }
+    };
+
+    //-------------------------------------------------image_filter_kaiser
+    class image_filter_kaiser
+    {
+        double a;
+        double i0a;
+        double epsilon;
+
+    public:
+        image_filter_kaiser(double b = 6.33) :
+            a(b), epsilon(1e-12)
+        {
+            i0a = 1.0 / bessel_i0(b);
+        }
+
+        static double radius() { return 1.0; }
+        double calc_weight(double x) const
+        {
+            return bessel_i0(a * sqrt(1. - x * x)) * i0a;
+        }
+
+    private:
+        double bessel_i0(double x) const
+        {
+            int i;
+            double sum, y, t;
+
+            sum = 1.;
+            y = x * x / 4.;
+            t = y;
+        
+            for(i = 2; t > epsilon; i++)
+            {
+                sum += t;
+                t *= (double)y / (i * i);
+            }
+            return sum;
+        }
+    };
+
+    //----------------------------------------------image_filter_catrom
+    struct image_filter_catrom
+    {
+        static double radius() { return 2.0; }
+        static double calc_weight(double x)
+        {
+            if(x <  1.0) return 0.5 * (2.0 + x * x * (-5.0 + x * 3.0));
+            if(x <  2.0) return 0.5 * (4.0 + x * (-8.0 + x * (5.0 - x)));
+            return 0.;
+        }
+    };
+
+    //---------------------------------------------image_filter_mitchell
+    class image_filter_mitchell
+    {
+        double p0, p2, p3;
+        double q0, q1, q2, q3;
+
+    public:
+        image_filter_mitchell(double b = 1.0/3.0, double c = 1.0/3.0) :
+            p0((6.0 - 2.0 * b) / 6.0),
+            p2((-18.0 + 12.0 * b + 6.0 * c) / 6.0),
+            p3((12.0 - 9.0 * b - 6.0 * c) / 6.0),
+            q0((8.0 * b + 24.0 * c) / 6.0),
+            q1((-12.0 * b - 48.0 * c) / 6.0),
+            q2((6.0 * b + 30.0 * c) / 6.0),
+            q3((-b - 6.0 * c) / 6.0)
+        {}
+
+        static double radius() { return 2.0; }
+        double calc_weight(double x) const
+        {
+            if(x < 1.0) return p0 + x * x * (p2 + x * p3);
+            if(x < 2.0) return q0 + x * (q1 + x * (q2 + x * q3));
+            return 0.0;
+        }
+    };
+
+
+    //----------------------------------------------image_filter_spline16
+    struct image_filter_spline16
+    {
+        static double radius() { return 2.0; }
+        static double calc_weight(double x)
+        {
+            if(x < 1.0)
+            {
+                return ((x - 9.0/5.0 ) * x - 1.0/5.0 ) * x + 1.0;
+            }
+            return ((-1.0/3.0 * (x-1) + 4.0/5.0) * (x-1) - 7.0/15.0 ) * (x-1);
+        }
+    };
+
+
+    //---------------------------------------------image_filter_spline36
+    struct image_filter_spline36
+    {
+        static double radius() { return 3.0; }
+        static double calc_weight(double x)
+        {
+           if(x < 1.0)
+           {
+              return ((13.0/11.0 * x - 453.0/209.0) * x - 3.0/209.0) * x + 1.0;
+           }
+           if(x < 2.0)
+           {
+              return ((-6.0/11.0 * (x-1) + 270.0/209.0) * (x-1) - 156.0/ 209.0) * (x-1);
+           }
+           return ((1.0/11.0 * (x-2) - 45.0/209.0) * (x-2) +  26.0/209.0) * (x-2);
+        }
+    };
+
+
+    //----------------------------------------------image_filter_gaussian
+    struct image_filter_gaussian
+    {
+        static double radius() { return 2.0; }
+        static double calc_weight(double x) 
+        {
+            return exp(-2.0 * x * x) * sqrt(2.0 / pi);
+        }
+    };
+
+
+    //------------------------------------------------image_filter_bessel
+    struct image_filter_bessel
+    {
+        static double radius() { return 3.2383; } 
+        static double calc_weight(double x)
+        {
+            return (x == 0.0) ? pi / 4.0 : besj(pi * x, 1) / (2.0 * x);
+        }
+    };
+
+
+    //-------------------------------------------------image_filter_sinc
+    class image_filter_sinc
+    {
+    public:
+        image_filter_sinc(double r) : m_radius(r < 2.0 ? 2.0 : r) {}
+        double radius() const { return m_radius; }
+        double calc_weight(double x) const
+        {
+            if(x == 0.0) return 1.0;
+            x *= pi;
+            return sin(x) / x;
+        }
+    private:
+        double m_radius;
+    };
+
+
+    //-----------------------------------------------image_filter_lanczos
+    class image_filter_lanczos
+    {
+    public:
+        image_filter_lanczos(double r) : m_radius(r < 2.0 ? 2.0 : r) {}
+        double radius() const { return m_radius; }
+        double calc_weight(double x) const
+        {
+           if(x == 0.0) return 1.0;
+           if(x > m_radius) return 0.0;
+           x *= pi;
+           double xr = x / m_radius;
+           return (sin(x) / x) * (sin(xr) / xr);
+        }
+    private:
+        double m_radius;
+    };
+
+
+    //----------------------------------------------image_filter_blackman
+    class image_filter_blackman
+    {
+    public:
+        image_filter_blackman(double r) : m_radius(r < 2.0 ? 2.0 : r) {}
+        double radius() const { return m_radius; }
+        double calc_weight(double x) const
+        {
+           if(x == 0.0) return 1.0;
+           if(x > m_radius) return 0.0;
+           x *= pi;
+           double xr = x / m_radius;
+           return (sin(x) / x) * (0.42 + 0.5*cos(xr) + 0.08*cos(2*xr));
+        }
+    private:
+        double m_radius;
+    };
+
+    //------------------------------------------------image_filter_sinc36
+    class image_filter_sinc36 : public image_filter_sinc
+    { public: image_filter_sinc36() : image_filter_sinc(3.0){} };
+
+    //------------------------------------------------image_filter_sinc64
+    class image_filter_sinc64 : public image_filter_sinc
+    { public: image_filter_sinc64() : image_filter_sinc(4.0){} };
+
+    //-----------------------------------------------image_filter_sinc100
+    class image_filter_sinc100 : public image_filter_sinc
+    { public: image_filter_sinc100() : image_filter_sinc(5.0){} };
+
+    //-----------------------------------------------image_filter_sinc144
+    class image_filter_sinc144 : public image_filter_sinc
+    { public: image_filter_sinc144() : image_filter_sinc(6.0){} };
+
+    //-----------------------------------------------image_filter_sinc196
+    class image_filter_sinc196 : public image_filter_sinc
+    { public: image_filter_sinc196() : image_filter_sinc(7.0){} };
+
+    //-----------------------------------------------image_filter_sinc256
+    class image_filter_sinc256 : public image_filter_sinc
+    { public: image_filter_sinc256() : image_filter_sinc(8.0){} };
+
+    //---------------------------------------------image_filter_lanczos36
+    class image_filter_lanczos36 : public image_filter_lanczos
+    { public: image_filter_lanczos36() : image_filter_lanczos(3.0){} };
+
+    //---------------------------------------------image_filter_lanczos64
+    class image_filter_lanczos64 : public image_filter_lanczos
+    { public: image_filter_lanczos64() : image_filter_lanczos(4.0){} };
+
+    //--------------------------------------------image_filter_lanczos100
+    class image_filter_lanczos100 : public image_filter_lanczos
+    { public: image_filter_lanczos100() : image_filter_lanczos(5.0){} };
+
+    //--------------------------------------------image_filter_lanczos144
+    class image_filter_lanczos144 : public image_filter_lanczos
+    { public: image_filter_lanczos144() : image_filter_lanczos(6.0){} };
+
+    //--------------------------------------------image_filter_lanczos196
+    class image_filter_lanczos196 : public image_filter_lanczos
+    { public: image_filter_lanczos196() : image_filter_lanczos(7.0){} };
+
+    //--------------------------------------------image_filter_lanczos256
+    class image_filter_lanczos256 : public image_filter_lanczos
+    { public: image_filter_lanczos256() : image_filter_lanczos(8.0){} };
+
+    //--------------------------------------------image_filter_blackman36
+    class image_filter_blackman36 : public image_filter_blackman
+    { public: image_filter_blackman36() : image_filter_blackman(3.0){} };
+
+    //--------------------------------------------image_filter_blackman64
+    class image_filter_blackman64 : public image_filter_blackman
+    { public: image_filter_blackman64() : image_filter_blackman(4.0){} };
+
+    //-------------------------------------------image_filter_blackman100
+    class image_filter_blackman100 : public image_filter_blackman
+    { public: image_filter_blackman100() : image_filter_blackman(5.0){} };
+
+    //-------------------------------------------image_filter_blackman144
+    class image_filter_blackman144 : public image_filter_blackman
+    { public: image_filter_blackman144() : image_filter_blackman(6.0){} };
+
+    //-------------------------------------------image_filter_blackman196
+    class image_filter_blackman196 : public image_filter_blackman
+    { public: image_filter_blackman196() : image_filter_blackman(7.0){} };
+
+    //-------------------------------------------image_filter_blackman256
+    class image_filter_blackman256 : public image_filter_blackman
+    { public: image_filter_blackman256() : image_filter_blackman(8.0){} };
+
+
+}
+
+#endif

3rd/agg/include/agg_math.h

@@ -0,0 +1,437 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+// Bessel function (besj) was adapted for use in AGG library by Andy Wilk 
+// Contact: castor.vulgaris@gmail.com
+//----------------------------------------------------------------------------
+
+#ifndef AGG_MATH_INCLUDED
+#define AGG_MATH_INCLUDED
+
+#include <math.h>
+#include "agg_basics.h"
+
+namespace agg
+{
+
+    //------------------------------------------------------vertex_dist_epsilon
+    // Coinciding points maximal distance (Epsilon)
+    const double vertex_dist_epsilon = 1e-14;
+
+    //-----------------------------------------------------intersection_epsilon
+    // See calc_intersection
+    const double intersection_epsilon = 1.0e-30;
+
+    //------------------------------------------------------------cross_product
+    AGG_INLINE double cross_product(double x1, double y1, 
+                                    double x2, double y2, 
+                                    double x,  double y)
+    {
+        return (x - x2) * (y2 - y1) - (y - y2) * (x2 - x1);
+    }
+
+    //--------------------------------------------------------point_in_triangle
+    AGG_INLINE bool point_in_triangle(double x1, double y1, 
+                                      double x2, double y2, 
+                                      double x3, double y3, 
+                                      double x,  double y)
+    {
+        bool cp1 = cross_product(x1, y1, x2, y2, x, y) < 0.0;
+        bool cp2 = cross_product(x2, y2, x3, y3, x, y) < 0.0;
+        bool cp3 = cross_product(x3, y3, x1, y1, x, y) < 0.0;
+        return cp1 == cp2 && cp2 == cp3 && cp3 == cp1;
+    }
+
+    //-----------------------------------------------------------calc_distance
+    AGG_INLINE double calc_distance(double x1, double y1, double x2, double y2)
+    {
+        double dx = x2-x1;
+        double dy = y2-y1;
+        return sqrt(dx * dx + dy * dy);
+    }
+
+    //--------------------------------------------------------calc_sq_distance
+    AGG_INLINE double calc_sq_distance(double x1, double y1, double x2, double y2)
+    {
+        double dx = x2-x1;
+        double dy = y2-y1;
+        return dx * dx + dy * dy;
+    }
+
+    //------------------------------------------------calc_line_point_distance
+    AGG_INLINE double calc_line_point_distance(double x1, double y1, 
+                                               double x2, double y2, 
+                                               double x,  double y)
+    {
+        double dx = x2-x1;
+        double dy = y2-y1;
+        double d = sqrt(dx * dx + dy * dy);
+        if(d < vertex_dist_epsilon)
+        {
+            return calc_distance(x1, y1, x, y);
+        }
+        return ((x - x2) * dy - (y - y2) * dx) / d;
+    }
+
+    //-------------------------------------------------------calc_line_point_u
+    AGG_INLINE double calc_segment_point_u(double x1, double y1, 
+                                           double x2, double y2, 
+                                           double x,  double y)
+    {
+        double dx = x2 - x1;
+        double dy = y2 - y1;
+
+        if(dx == 0 && dy == 0)
+        {
+	        return 0;
+        }
+
+        double pdx = x - x1;
+        double pdy = y - y1;
+
+        return (pdx * dx + pdy * dy) / (dx * dx + dy * dy);
+    }
+
+    //---------------------------------------------calc_line_point_sq_distance
+    AGG_INLINE double calc_segment_point_sq_distance(double x1, double y1, 
+                                                     double x2, double y2, 
+                                                     double x,  double y,
+                                                     double u)
+    {
+        if(u <= 0)
+        {
+	        return calc_sq_distance(x, y, x1, y1);
+        }
+        else 
+        if(u >= 1)
+        {
+	        return calc_sq_distance(x, y, x2, y2);
+        }
+        return calc_sq_distance(x, y, x1 + u * (x2 - x1), y1 + u * (y2 - y1));
+    }
+
+    //---------------------------------------------calc_line_point_sq_distance
+    AGG_INLINE double calc_segment_point_sq_distance(double x1, double y1, 
+                                                     double x2, double y2, 
+                                                     double x,  double y)
+    {
+        return 
+            calc_segment_point_sq_distance(
+                x1, y1, x2, y2, x, y,
+                calc_segment_point_u(x1, y1, x2, y2, x, y));
+    }
+
+    //-------------------------------------------------------calc_intersection
+    AGG_INLINE bool calc_intersection(double ax, double ay, double bx, double by,
+                                      double cx, double cy, double dx, double dy,
+                                      double* x, double* y)
+    {
+        double num = (ay-cy) * (dx-cx) - (ax-cx) * (dy-cy);
+        double den = (bx-ax) * (dy-cy) - (by-ay) * (dx-cx);
+        if(fabs(den) < intersection_epsilon) return false;
+        double r = num / den;
+        *x = ax + r * (bx-ax);
+        *y = ay + r * (by-ay);
+        return true;
+    }
+
+    //-----------------------------------------------------intersection_exists
+    AGG_INLINE bool intersection_exists(double x1, double y1, double x2, double y2,
+                                        double x3, double y3, double x4, double y4)
+    {
+        // It's less expensive but you can't control the 
+        // boundary conditions: Less or LessEqual
+        double dx1 = x2 - x1;
+        double dy1 = y2 - y1;
+        double dx2 = x4 - x3;
+        double dy2 = y4 - y3;
+        return ((x3 - x2) * dy1 - (y3 - y2) * dx1 < 0.0) != 
+               ((x4 - x2) * dy1 - (y4 - y2) * dx1 < 0.0) &&
+               ((x1 - x4) * dy2 - (y1 - y4) * dx2 < 0.0) !=
+               ((x2 - x4) * dy2 - (y2 - y4) * dx2 < 0.0);
+
+        // It's is more expensive but more flexible 
+        // in terms of boundary conditions.
+        //--------------------
+        //double den  = (x2-x1) * (y4-y3) - (y2-y1) * (x4-x3);
+        //if(fabs(den) < intersection_epsilon) return false;
+        //double nom1 = (x4-x3) * (y1-y3) - (y4-y3) * (x1-x3);
+        //double nom2 = (x2-x1) * (y1-y3) - (y2-y1) * (x1-x3);
+        //double ua = nom1 / den;
+        //double ub = nom2 / den;
+        //return ua >= 0.0 && ua <= 1.0 && ub >= 0.0 && ub <= 1.0;
+    }
+
+    //--------------------------------------------------------calc_orthogonal
+    AGG_INLINE void calc_orthogonal(double thickness,
+                                    double x1, double y1,
+                                    double x2, double y2,
+                                    double* x, double* y)
+    {
+        double dx = x2 - x1;
+        double dy = y2 - y1;
+        double d = sqrt(dx*dx + dy*dy); 
+        *x =  thickness * dy / d;
+        *y = -thickness * dx / d;
+    }
+
+    //--------------------------------------------------------dilate_triangle
+    AGG_INLINE void dilate_triangle(double x1, double y1,
+                                    double x2, double y2,
+                                    double x3, double y3,
+                                    double *x, double* y,
+                                    double d)
+    {
+        double dx1=0.0;
+        double dy1=0.0; 
+        double dx2=0.0;
+        double dy2=0.0; 
+        double dx3=0.0;
+        double dy3=0.0; 
+        double loc = cross_product(x1, y1, x2, y2, x3, y3);
+        if(fabs(loc) > intersection_epsilon)
+        {
+            if(cross_product(x1, y1, x2, y2, x3, y3) > 0.0) 
+            {
+                d = -d;
+            }
+            calc_orthogonal(d, x1, y1, x2, y2, &dx1, &dy1);
+            calc_orthogonal(d, x2, y2, x3, y3, &dx2, &dy2);
+            calc_orthogonal(d, x3, y3, x1, y1, &dx3, &dy3);
+        }
+        *x++ = x1 + dx1;  *y++ = y1 + dy1;
+        *x++ = x2 + dx1;  *y++ = y2 + dy1;
+        *x++ = x2 + dx2;  *y++ = y2 + dy2;
+        *x++ = x3 + dx2;  *y++ = y3 + dy2;
+        *x++ = x3 + dx3;  *y++ = y3 + dy3;
+        *x++ = x1 + dx3;  *y++ = y1 + dy3;
+    }
+
+    //------------------------------------------------------calc_triangle_area
+    AGG_INLINE double calc_triangle_area(double x1, double y1,
+                                         double x2, double y2,
+                                         double x3, double y3)
+    {
+        return (x1*y2 - x2*y1 + x2*y3 - x3*y2 + x3*y1 - x1*y3) * 0.5;
+    }
+
+    //-------------------------------------------------------calc_polygon_area
+    template<class Storage> double calc_polygon_area(const Storage& st)
+    {
+        unsigned i;
+        double sum = 0.0;
+        double x  = st[0].x;
+        double y  = st[0].y;
+        double xs = x;
+        double ys = y;
+
+        for(i = 1; i < st.size(); i++)
+        {
+            const typename Storage::value_type& v = st[i];
+            sum += x * v.y - y * v.x;
+            x = v.x;
+            y = v.y;
+        }
+        return (sum + x * ys - y * xs) * 0.5;
+    }
+
+    //------------------------------------------------------------------------
+    // Tables for fast sqrt
+    extern int16u g_sqrt_table[1024];
+    extern int8   g_elder_bit_table[256];
+
+
+    //---------------------------------------------------------------fast_sqrt
+    //Fast integer Sqrt - really fast: no cycles, divisions or multiplications
+    #if defined(_MSC_VER)
+    #pragma warning(push)
+    #pragma warning(disable : 4035) //Disable warning "no return value"
+    #endif
+    AGG_INLINE unsigned fast_sqrt(unsigned val)
+    {
+    #if defined(_M_IX86) && defined(_MSC_VER) && !defined(AGG_NO_ASM)
+        //For Ix86 family processors this assembler code is used. 
+        //The key command here is bsr - determination the number of the most 
+        //significant bit of the value. For other processors
+        //(and maybe compilers) the pure C "#else" section is used.
+        __asm
+        {
+            mov ebx, val
+            mov edx, 11
+            bsr ecx, ebx
+            sub ecx, 9
+            jle less_than_9_bits
+            shr ecx, 1
+            adc ecx, 0
+            sub edx, ecx
+            shl ecx, 1
+            shr ebx, cl
+    less_than_9_bits:
+            xor eax, eax
+            mov  ax, g_sqrt_table[ebx*2]
+            mov ecx, edx
+            shr eax, cl
+        }
+    #else
+
+        //This code is actually pure C and portable to most 
+        //arcitectures including 64bit ones. 
+        unsigned t = val;
+        int bit=0;
+        unsigned shift = 11;
+
+        //The following piece of code is just an emulation of the
+        //Ix86 assembler command "bsr" (see above). However on old
+        //Intels (like Intel MMX 233MHz) this code is about twice 
+        //faster (sic!) then just one "bsr". On PIII and PIV the
+        //bsr is optimized quite well.
+        bit = t >> 24;
+        if(bit)
+        {
+            bit = g_elder_bit_table[bit] + 24;
+        }
+        else
+        {
+            bit = (t >> 16) & 0xFF;
+            if(bit)
+            {
+                bit = g_elder_bit_table[bit] + 16;
+            }
+            else
+            {
+                bit = (t >> 8) & 0xFF;
+                if(bit)
+                {
+                    bit = g_elder_bit_table[bit] + 8;
+                }
+                else
+                {
+                    bit = g_elder_bit_table[t];
+                }
+            }
+        }
+
+        //This code calculates the sqrt.
+        bit -= 9;
+        if(bit > 0)
+        {
+            bit = (bit >> 1) + (bit & 1);
+            shift -= bit;
+            val >>= (bit << 1);
+        }
+        return g_sqrt_table[val] >> shift;
+    #endif
+    }
+    #if defined(_MSC_VER)
+    #pragma warning(pop)
+    #endif
+
+
+
+
+    //--------------------------------------------------------------------besj
+    // Function BESJ calculates Bessel function of first kind of order n
+    // Arguments:
+    //     n - an integer (>=0), the order
+    //     x - value at which the Bessel function is required
+    //--------------------
+    // C++ Mathematical Library
+    // Convereted from equivalent FORTRAN library
+    // Converetd by Gareth Walker for use by course 392 computational project
+    // All functions tested and yield the same results as the corresponding
+    // FORTRAN versions.
+    //
+    // If you have any problems using these functions please report them to
+    // M.Muldoon@UMIST.ac.uk
+    //
+    // Documentation available on the web
+    // http://www.ma.umist.ac.uk/mrm/Teaching/392/libs/392.html
+    // Version 1.0   8/98
+    // 29 October, 1999
+    //--------------------
+    // Adapted for use in AGG library by Andy Wilk (castor.vulgaris@gmail.com)
+    //------------------------------------------------------------------------
+    inline double besj(double x, int n)
+    {
+        if(n < 0)
+        {
+            return 0;
+        }
+        double d = 1E-6;
+        double b = 0;
+        if(fabs(x) <= d) 
+        {
+            if(n != 0) return 0;
+            return 1;
+        }
+        double b1 = 0; // b1 is the value from the previous iteration
+        // Set up a starting order for recurrence
+        int m1 = (int)fabs(x) + 6;
+        if(fabs(x) > 5) 
+        {
+            m1 = (int)(fabs(1.4 * x + 60 / x));
+        }
+        int m2 = (int)(n + 2 + fabs(x) / 4);
+        if (m1 > m2) 
+        {
+            m2 = m1;
+        }
+    
+        // Apply recurrence down from curent max order
+        for(;;) 
+        {
+            double c3 = 0;
+            double c2 = 1E-30;
+            double c4 = 0;
+            int m8 = 1;
+            if (m2 / 2 * 2 == m2) 
+            {
+                m8 = -1;
+            }
+            int imax = m2 - 2;
+            for (int i = 1; i <= imax; i++) 
+            {
+                double c6 = 2 * (m2 - i) * c2 / x - c3;
+                c3 = c2;
+                c2 = c6;
+                if(m2 - i - 1 == n)
+                {
+                    b = c6;
+                }
+                m8 = -1 * m8;
+                if (m8 > 0)
+                {
+                    c4 = c4 + 2 * c6;
+                }
+            }
+            double c6 = 2 * c2 / x - c3;
+            if(n == 0)
+            {
+                b = c6;
+            }
+            c4 += c6;
+            b /= c4;
+            if(fabs(b - b1) < d)
+            {
+                return b;
+            }
+            b1 = b;
+            m2 += 3;
+        }
+    }
+
+}
+
+
+#endif

3rd/agg/include/agg_math_stroke.h

@@ -0,0 +1,526 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// Stroke math
+//
+//----------------------------------------------------------------------------
+
+#ifndef AGG_STROKE_MATH_INCLUDED
+#define AGG_STROKE_MATH_INCLUDED
+
+#include "agg_math.h"
+#include "agg_vertex_sequence.h"
+
+namespace agg
+{
+    //-------------------------------------------------------------line_cap_e
+    enum line_cap_e
+    {
+        butt_cap,
+        square_cap,
+        round_cap
+    };
+
+    //------------------------------------------------------------line_join_e
+    enum line_join_e
+    {
+        miter_join         = 0,
+        miter_join_revert  = 1,
+        round_join         = 2,
+        bevel_join         = 3,
+        miter_join_round   = 4
+    };
+
+
+    //-----------------------------------------------------------inner_join_e
+    enum inner_join_e
+    {
+        inner_bevel,
+        inner_miter,
+        inner_jag,
+        inner_round
+    };
+
+    //------------------------------------------------------------math_stroke
+    template<class VertexConsumer> class math_stroke
+    {
+    public:
+        typedef typename VertexConsumer::value_type coord_type;
+
+        math_stroke();
+
+        void line_cap(line_cap_e lc)     { m_line_cap = lc; }
+        void line_join(line_join_e lj)   { m_line_join = lj; }
+        void inner_join(inner_join_e ij) { m_inner_join = ij; }
+
+        line_cap_e   line_cap()   const { return m_line_cap; }
+        line_join_e  line_join()  const { return m_line_join; }
+        inner_join_e inner_join() const { return m_inner_join; }
+
+        void width(double w);
+        void miter_limit(double ml) { m_miter_limit = ml; }
+        void miter_limit_theta(double t);
+        void inner_miter_limit(double ml) { m_inner_miter_limit = ml; }
+        void approximation_scale(double as) { m_approx_scale = as; }
+
+        double width() const { return m_width * 2.0; }
+        double miter_limit() const { return m_miter_limit; }
+        double inner_miter_limit() const { return m_inner_miter_limit; }
+        double approximation_scale() const { return m_approx_scale; }
+
+        void calc_cap(VertexConsumer& vc,
+                      const vertex_dist& v0, 
+                      const vertex_dist& v1, 
+                      double len);
+
+        void calc_join(VertexConsumer& vc,
+                       const vertex_dist& v0, 
+                       const vertex_dist& v1, 
+                       const vertex_dist& v2,
+                       double len1, 
+                       double len2);
+
+    private:
+        AGG_INLINE void add_vertex(VertexConsumer& vc, double x, double y)
+        {
+            vc.add(coord_type(x, y));
+        }
+
+        void calc_arc(VertexConsumer& vc,
+                      double x,   double y, 
+                      double dx1, double dy1, 
+                      double dx2, double dy2);
+
+        void calc_miter(VertexConsumer& vc,
+                        const vertex_dist& v0, 
+                        const vertex_dist& v1, 
+                        const vertex_dist& v2,
+                        double dx1, double dy1, 
+                        double dx2, double dy2,
+                        line_join_e lj,
+                        double mlimit,
+                        double dbevel);
+
+        double       m_width;
+        double       m_width_abs;
+        double       m_width_eps;
+        int          m_width_sign;
+        double       m_miter_limit;
+        double       m_inner_miter_limit;
+        double       m_approx_scale;
+        line_cap_e   m_line_cap;
+        line_join_e  m_line_join;
+        inner_join_e m_inner_join;
+    };
+
+    //-----------------------------------------------------------------------
+    template<class VC> math_stroke<VC>::math_stroke() :
+        m_width(0.5),
+        m_width_abs(0.5),
+        m_width_eps(0.5/1024.0),
+        m_width_sign(1),
+        m_miter_limit(4.0),
+        m_inner_miter_limit(1.01),
+        m_approx_scale(1.0),
+        m_line_cap(butt_cap),
+        m_line_join(miter_join),
+        m_inner_join(inner_miter)
+    {
+    }
+
+    //-----------------------------------------------------------------------
+    template<class VC> void math_stroke<VC>::width(double w)
+    { 
+        m_width = w * 0.5; 
+        if(m_width < 0)
+        {
+            m_width_abs  = -m_width;
+            m_width_sign = -1;
+        }
+        else
+        {
+            m_width_abs  = m_width;
+            m_width_sign = 1;
+        }
+        m_width_eps = m_width / 1024.0;
+    }
+
+    //-----------------------------------------------------------------------
+    template<class VC> void math_stroke<VC>::miter_limit_theta(double t)
+    { 
+        m_miter_limit = 1.0 / sin(t * 0.5) ;
+    }
+
+    //-----------------------------------------------------------------------
+    template<class VC> 
+    void math_stroke<VC>::calc_arc(VC& vc,
+                                   double x,   double y, 
+                                   double dx1, double dy1, 
+                                   double dx2, double dy2)
+    {
+        double a1 = atan2(dy1 * m_width_sign, dx1 * m_width_sign);
+        double a2 = atan2(dy2 * m_width_sign, dx2 * m_width_sign);
+        double da = a1 - a2;
+        int i, n;
+
+        da = acos(m_width_abs / (m_width_abs + 0.125 / m_approx_scale)) * 2;
+
+        add_vertex(vc, x + dx1, y + dy1);
+        if(m_width_sign > 0)
+        {
+            if(a1 > a2) a2 += 2 * pi;
+            n = int((a2 - a1) / da);
+            da = (a2 - a1) / (n + 1);
+            a1 += da;
+            for(i = 0; i < n; i++)
+            {
+                add_vertex(vc, x + cos(a1) * m_width, y + sin(a1) * m_width);
+                a1 += da;
+            }
+        }
+        else
+        {
+            if(a1 < a2) a2 -= 2 * pi;
+            n = int((a1 - a2) / da);
+            da = (a1 - a2) / (n + 1);
+            a1 -= da;
+            for(i = 0; i < n; i++)
+            {
+                add_vertex(vc, x + cos(a1) * m_width, y + sin(a1) * m_width);
+                a1 -= da;
+            }
+        }
+        add_vertex(vc, x + dx2, y + dy2);
+    }
+
+    //-----------------------------------------------------------------------
+    template<class VC> 
+    void math_stroke<VC>::calc_miter(VC& vc,
+                                     const vertex_dist& v0, 
+                                     const vertex_dist& v1, 
+                                     const vertex_dist& v2,
+                                     double dx1, double dy1, 
+                                     double dx2, double dy2,
+                                     line_join_e lj,
+                                     double mlimit,
+                                     double dbevel)
+    {
+        double xi  = v1.x;
+        double yi  = v1.y;
+        double di  = 1;
+        double lim = m_width_abs * mlimit;
+        bool miter_limit_exceeded = true; // Assume the worst
+        bool intersection_failed  = true; // Assume the worst
+
+        if(calc_intersection(v0.x + dx1, v0.y - dy1,
+                             v1.x + dx1, v1.y - dy1,
+                             v1.x + dx2, v1.y - dy2,
+                             v2.x + dx2, v2.y - dy2,
+                             &xi, &yi))
+        {
+            // Calculation of the intersection succeeded
+            //---------------------
+            di = calc_distance(v1.x, v1.y, xi, yi);
+            if(di <= lim)
+            {
+                // Inside the miter limit
+                //---------------------
+                add_vertex(vc, xi, yi);
+                miter_limit_exceeded = false;
+            }
+            intersection_failed = false;
+        }
+        else
+        {
+            // Calculation of the intersection failed, most probably
+            // the three points lie one straight line. 
+            // First check if v0 and v2 lie on the opposite sides of vector: 
+            // (v1.x, v1.y) -> (v1.x+dx1, v1.y-dy1), that is, the perpendicular
+            // to the line determined by vertices v0 and v1.
+            // This condition determines whether the next line segments continues
+            // the previous one or goes back.
+            //----------------
+            double x2 = v1.x + dx1;
+            double y2 = v1.y - dy1;
+            if((cross_product(v0.x, v0.y, v1.x, v1.y, x2, y2) < 0.0) == 
+               (cross_product(v1.x, v1.y, v2.x, v2.y, x2, y2) < 0.0))
+            {
+                // This case means that the next segment continues 
+                // the previous one (straight line)
+                //-----------------
+                add_vertex(vc, v1.x + dx1, v1.y - dy1);
+                miter_limit_exceeded = false;
+            }
+        }
+
+        if(miter_limit_exceeded)
+        {
+            // Miter limit exceeded
+            //------------------------
+            switch(lj)
+            {
+            case miter_join_revert:
+                // For the compatibility with SVG, PDF, etc, 
+                // we use a simple bevel join instead of
+                // "smart" bevel
+                //-------------------
+                add_vertex(vc, v1.x + dx1, v1.y - dy1);
+                add_vertex(vc, v1.x + dx2, v1.y - dy2);
+                break;
+
+            case miter_join_round:
+                calc_arc(vc, v1.x, v1.y, dx1, -dy1, dx2, -dy2);
+                break;
+
+            default:
+                // If no miter-revert, calculate new dx1, dy1, dx2, dy2
+                //----------------
+                if(intersection_failed)
+                {
+                    mlimit *= m_width_sign;
+                    add_vertex(vc, v1.x + dx1 + dy1 * mlimit, 
+                                   v1.y - dy1 + dx1 * mlimit);
+                    add_vertex(vc, v1.x + dx2 - dy2 * mlimit, 
+                                   v1.y - dy2 - dx2 * mlimit);
+                }
+                else
+                {
+                    double x1 = v1.x + dx1;
+                    double y1 = v1.y - dy1;
+                    double x2 = v1.x + dx2;
+                    double y2 = v1.y - dy2;
+                    di = (lim - dbevel) / (di - dbevel);
+                    add_vertex(vc, x1 + (xi - x1) * di, 
+                                   y1 + (yi - y1) * di);
+                    add_vertex(vc, x2 + (xi - x2) * di, 
+                                   y2 + (yi - y2) * di);
+                }
+                break;
+            }
+        }
+    }
+
+    //--------------------------------------------------------stroke_calc_cap
+    template<class VC> 
+    void math_stroke<VC>::calc_cap(VC& vc,
+                                   const vertex_dist& v0, 
+                                   const vertex_dist& v1, 
+                                   double len)
+    {
+        vc.remove_all();
+
+        double dx1 = (v1.y - v0.y) / len;
+        double dy1 = (v1.x - v0.x) / len;
+        double dx2 = 0;
+        double dy2 = 0;
+
+        dx1 *= m_width;
+        dy1 *= m_width;
+
+        if(m_line_cap != round_cap)
+        {
+            if(m_line_cap == square_cap)
+            {
+                dx2 = dy1 * m_width_sign;
+                dy2 = dx1 * m_width_sign;
+            }
+            add_vertex(vc, v0.x - dx1 - dx2, v0.y + dy1 - dy2);
+            add_vertex(vc, v0.x + dx1 - dx2, v0.y - dy1 - dy2);
+        }
+        else
+        {
+            double da = acos(m_width_abs / (m_width_abs + 0.125 / m_approx_scale)) * 2;
+            double a1;
+            int i;
+            int n = int(pi / da);
+
+            da = pi / (n + 1);
+            add_vertex(vc, v0.x - dx1, v0.y + dy1);
+            if(m_width_sign > 0)
+            {
+                a1 = atan2(dy1, -dx1);
+                a1 += da;
+                for(i = 0; i < n; i++)
+                {
+                    add_vertex(vc, v0.x + cos(a1) * m_width, 
+                                   v0.y + sin(a1) * m_width);
+                    a1 += da;
+                }
+            }
+            else
+            {
+                a1 = atan2(-dy1, dx1);
+                a1 -= da;
+                for(i = 0; i < n; i++)
+                {
+                    add_vertex(vc, v0.x + cos(a1) * m_width, 
+                                   v0.y + sin(a1) * m_width);
+                    a1 -= da;
+                }
+            }
+            add_vertex(vc, v0.x + dx1, v0.y - dy1);
+        }
+    }
+
+    //-----------------------------------------------------------------------
+    template<class VC> 
+    void math_stroke<VC>::calc_join(VC& vc,
+                                    const vertex_dist& v0, 
+                                    const vertex_dist& v1, 
+                                    const vertex_dist& v2,
+                                    double len1, 
+                                    double len2)
+    {
+        double dx1 = m_width * (v1.y - v0.y) / len1;
+        double dy1 = m_width * (v1.x - v0.x) / len1;
+        double dx2 = m_width * (v2.y - v1.y) / len2;
+        double dy2 = m_width * (v2.x - v1.x) / len2;
+
+        vc.remove_all();
+
+        double cp = cross_product(v0.x, v0.y, v1.x, v1.y, v2.x, v2.y);
+        if(cp != 0 && (cp > 0) == (m_width > 0))
+        {
+            // Inner join
+            //---------------
+            double limit = ((len1 < len2) ? len1 : len2) / m_width_abs;
+            if(limit < m_inner_miter_limit)
+            {
+                limit = m_inner_miter_limit;
+            }
+
+            switch(m_inner_join)
+            {
+            default: // inner_bevel
+                add_vertex(vc, v1.x + dx1, v1.y - dy1);
+                add_vertex(vc, v1.x + dx2, v1.y - dy2);
+                break;
+
+            case inner_miter:
+                calc_miter(vc,
+                           v0, v1, v2, dx1, dy1, dx2, dy2, 
+                           miter_join_revert, 
+                           limit, 0);
+                break;
+
+            case inner_jag:
+            case inner_round:
+                cp = (dx1-dx2) * (dx1-dx2) + (dy1-dy2) * (dy1-dy2);
+                if(cp < len1 * len1 && cp < len2 * len2)
+                {
+                    calc_miter(vc,
+                               v0, v1, v2, dx1, dy1, dx2, dy2, 
+                               miter_join_revert, 
+                               limit, 0);
+                }
+                else
+                {
+                    if(m_inner_join == inner_jag)
+                    {
+                        add_vertex(vc, v1.x + dx1, v1.y - dy1);
+                        add_vertex(vc, v1.x,       v1.y      );
+                        add_vertex(vc, v1.x + dx2, v1.y - dy2);
+                    }
+                    else
+                    {
+                        add_vertex(vc, v1.x + dx1, v1.y - dy1);
+                        add_vertex(vc, v1.x,       v1.y      );
+                        calc_arc(vc, v1.x, v1.y, dx2, -dy2, dx1, -dy1);
+                        add_vertex(vc, v1.x,       v1.y      );
+                        add_vertex(vc, v1.x + dx2, v1.y - dy2);
+                    }
+                }
+                break;
+            }
+        }
+        else
+        {
+            // Outer join
+            //---------------
+
+            // Calculate the distance between v1 and 
+            // the central point of the bevel line segment
+            //---------------
+            double dx = (dx1 + dx2) / 2;
+            double dy = (dy1 + dy2) / 2;
+            double dbevel = sqrt(dx * dx + dy * dy);
+
+            if(m_line_join == round_join || m_line_join == bevel_join)
+            {
+                // This is an optimization that reduces the number of points 
+                // in cases of almost collinear segments. If there's no
+                // visible difference between bevel and miter joins we'd rather
+                // use miter join because it adds only one point instead of two. 
+                //
+                // Here we calculate the middle point between the bevel points 
+                // and then, the distance between v1 and this middle point. 
+                // At outer joins this distance always less than stroke width, 
+                // because it's actually the height of an isosceles triangle of
+                // v1 and its two bevel points. If the difference between this
+                // width and this value is small (no visible bevel) we can 
+                // add just one point. 
+                //
+                // The constant in the expression makes the result approximately 
+                // the same as in round joins and caps. You can safely comment 
+                // out this entire "if".
+                //-------------------
+                if(m_approx_scale * (m_width_abs - dbevel) < m_width_eps)
+                {
+                    if(calc_intersection(v0.x + dx1, v0.y - dy1,
+                                         v1.x + dx1, v1.y - dy1,
+                                         v1.x + dx2, v1.y - dy2,
+                                         v2.x + dx2, v2.y - dy2,
+                                         &dx, &dy))
+                    {
+                        add_vertex(vc, dx, dy);
+                    }
+                    else
+                    {
+                        add_vertex(vc, v1.x + dx1, v1.y - dy1);
+                    }
+                    return;
+                }
+            }
+
+            switch(m_line_join)
+            {
+            case miter_join:
+            case miter_join_revert:
+            case miter_join_round:
+                calc_miter(vc, 
+                           v0, v1, v2, dx1, dy1, dx2, dy2, 
+                           m_line_join, 
+                           m_miter_limit,
+                           dbevel);
+                break;
+
+            case round_join:
+                calc_arc(vc, v1.x, v1.y, dx1, -dy1, dx2, -dy2);
+                break;
+
+            default: // Bevel join
+                add_vertex(vc, v1.x + dx1, v1.y - dy1);
+                add_vertex(vc, v1.x + dx2, v1.y - dy2);
+                break;
+            }
+        }
+    }
+
+
+
+
+}
+
+#endif

3rd/agg/include/agg_pixfmt_base.h

@@ -0,0 +1,97 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+
+#ifndef AGG_PIXFMT_BASE_INCLUDED
+#define AGG_PIXFMT_BASE_INCLUDED
+
+#include "agg_basics.h"
+#include "agg_color_gray.h"
+#include "agg_color_rgba.h"
+
+namespace agg
+{
+    struct pixfmt_gray_tag
+    {
+    };
+
+    struct pixfmt_rgb_tag
+    {
+    };
+
+    struct pixfmt_rgba_tag
+    {
+    };
+
+    //--------------------------------------------------------------blender_base
+    template<class ColorT, class Order = void> 
+    struct blender_base
+    {
+        typedef ColorT color_type;
+        typedef Order order_type;
+        typedef typename color_type::value_type value_type;
+
+        static rgba get(value_type r, value_type g, value_type b, value_type a, cover_type cover = cover_full)
+        {
+            if (cover > cover_none)
+            {
+                rgba c(
+                    color_type::to_double(r), 
+                    color_type::to_double(g), 
+                    color_type::to_double(b), 
+                    color_type::to_double(a));
+
+                if (cover < cover_full)
+                {
+                    double x = double(cover) / cover_full;
+                    c.r *= x;
+                    c.g *= x;
+                    c.b *= x;
+                    c.a *= x;
+                }
+
+                return c;
+            }
+            else return rgba::no_color();
+        }
+
+        static rgba get(const value_type* p, cover_type cover = cover_full)
+        {
+            return get(
+                p[order_type::R], 
+                p[order_type::G], 
+                p[order_type::B], 
+                p[order_type::A], 
+                cover);
+        }
+
+        static void set(value_type* p, value_type r, value_type g, value_type b, value_type a)
+        {
+            p[order_type::R] = r;
+            p[order_type::G] = g;
+            p[order_type::B] = b;
+            p[order_type::A] = a;
+        }
+
+        static void set(value_type* p, const rgba& c)
+        {
+            p[order_type::R] = color_type::from_double(c.r);
+            p[order_type::G] = color_type::from_double(c.g);
+            p[order_type::B] = color_type::from_double(c.b);
+            p[order_type::A] = color_type::from_double(c.a);
+        }
+    };
+}
+
+#endif

3rd/agg/include/agg_pixfmt_rgb.h

@@ -0,0 +1,995 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// Adaptation for high precision colors has been sponsored by 
+// Liberty Technology Systems, Inc., visit http://lib-sys.com
+//
+// Liberty Technology Systems, Inc. is the provider of
+// PostScript and PDF technology for software developers.
+// 
+//----------------------------------------------------------------------------
+
+#ifndef AGG_PIXFMT_RGB_INCLUDED
+#define AGG_PIXFMT_RGB_INCLUDED
+
+#include <string.h>
+#include "agg_pixfmt_base.h"
+#include "agg_rendering_buffer.h"
+
+namespace agg
+{
+
+    //=====================================================apply_gamma_dir_rgb
+    template<class ColorT, class Order, class GammaLut> class apply_gamma_dir_rgb
+    {
+    public:
+        typedef typename ColorT::value_type value_type;
+
+        apply_gamma_dir_rgb(const GammaLut& gamma) : m_gamma(gamma) {}
+
+        AGG_INLINE void operator () (value_type* p)
+        {
+            p[Order::R] = m_gamma.dir(p[Order::R]);
+            p[Order::G] = m_gamma.dir(p[Order::G]);
+            p[Order::B] = m_gamma.dir(p[Order::B]);
+        }
+
+    private:
+        const GammaLut& m_gamma;
+    };
+
+
+
+    //=====================================================apply_gamma_inv_rgb
+    template<class ColorT, class Order, class GammaLut> class apply_gamma_inv_rgb
+    {
+    public:
+        typedef typename ColorT::value_type value_type;
+
+        apply_gamma_inv_rgb(const GammaLut& gamma) : m_gamma(gamma) {}
+
+        AGG_INLINE void operator () (value_type* p)
+        {
+            p[Order::R] = m_gamma.inv(p[Order::R]);
+            p[Order::G] = m_gamma.inv(p[Order::G]);
+            p[Order::B] = m_gamma.inv(p[Order::B]);
+        }
+
+    private:
+        const GammaLut& m_gamma;
+    };
+
+
+    //=========================================================blender_rgb
+    template<class ColorT, class Order> 
+    struct blender_rgb
+    {
+        typedef ColorT color_type;
+        typedef Order order_type;
+        typedef typename color_type::value_type value_type;
+        typedef typename color_type::calc_type calc_type;
+        typedef typename color_type::long_type long_type;
+
+        // Blend pixels using the non-premultiplied form of Alvy-Ray Smith's
+        // compositing function. Since the render buffer is opaque we skip the
+        // initial premultiply and final demultiply.
+
+        //--------------------------------------------------------------------
+        static AGG_INLINE void blend_pix(value_type* p, 
+            value_type cr, value_type cg, value_type cb, value_type alpha, cover_type cover)
+        {
+            blend_pix(p, cr, cg, cb, color_type::mult_cover(alpha, cover));
+        }
+        
+        //--------------------------------------------------------------------
+        static AGG_INLINE void blend_pix(value_type* p, 
+            value_type cr, value_type cg, value_type cb, value_type alpha)
+        {
+            p[Order::R] = color_type::lerp(p[Order::R], cr, alpha);
+            p[Order::G] = color_type::lerp(p[Order::G], cg, alpha);
+            p[Order::B] = color_type::lerp(p[Order::B], cb, alpha);
+        }
+    };
+
+    //======================================================blender_rgb_pre
+    template<class ColorT, class Order> 
+    struct blender_rgb_pre
+    {
+        typedef ColorT color_type;
+        typedef Order order_type;
+        typedef typename color_type::value_type value_type;
+        typedef typename color_type::calc_type calc_type;
+        typedef typename color_type::long_type long_type;
+
+        // Blend pixels using the premultiplied form of Alvy-Ray Smith's
+        // compositing function. 
+
+        //--------------------------------------------------------------------
+        static AGG_INLINE void blend_pix(value_type* p, 
+            value_type cr, value_type cg, value_type cb, value_type alpha, cover_type cover)
+        {
+            blend_pix(p, 
+                color_type::mult_cover(cr, cover), 
+                color_type::mult_cover(cg, cover), 
+                color_type::mult_cover(cb, cover), 
+                color_type::mult_cover(alpha, cover));
+        }
+
+        //--------------------------------------------------------------------
+        static AGG_INLINE void blend_pix(value_type* p, 
+            value_type cr, value_type cg, value_type cb, value_type alpha)
+        {
+            p[Order::R] = color_type::prelerp(p[Order::R], cr, alpha);
+            p[Order::G] = color_type::prelerp(p[Order::G], cg, alpha);
+            p[Order::B] = color_type::prelerp(p[Order::B], cb, alpha);
+        }
+    };
+
+    //===================================================blender_rgb_gamma
+    template<class ColorT, class Order, class Gamma> 
+    class blender_rgb_gamma : public blender_base<ColorT, Order>
+    {
+    public:
+        typedef ColorT color_type;
+        typedef Order order_type;
+        typedef Gamma gamma_type;
+        typedef typename color_type::value_type value_type;
+        typedef typename color_type::calc_type calc_type;
+        typedef typename color_type::long_type long_type;
+
+        //--------------------------------------------------------------------
+        blender_rgb_gamma() : m_gamma(0) {}
+        void gamma(const gamma_type& g) { m_gamma = &g; }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE void blend_pix(value_type* p, 
+            value_type cr, value_type cg, value_type cb, value_type alpha, cover_type cover)
+        {
+            blend_pix(p, cr, cg, cb, color_type::mult_cover(alpha, cover));
+        }
+        
+        //--------------------------------------------------------------------
+        AGG_INLINE void blend_pix(value_type* p, 
+            value_type cr, value_type cg, value_type cb, value_type alpha)
+        {
+            calc_type r = m_gamma->dir(p[Order::R]);
+            calc_type g = m_gamma->dir(p[Order::G]);
+            calc_type b = m_gamma->dir(p[Order::B]);
+            p[Order::R] = m_gamma->inv(color_type::downscale((m_gamma->dir(cr) - r) * alpha) + r);
+            p[Order::G] = m_gamma->inv(color_type::downscale((m_gamma->dir(cg) - g) * alpha) + g);
+            p[Order::B] = m_gamma->inv(color_type::downscale((m_gamma->dir(cb) - b) * alpha) + b);
+        }
+        
+    private:
+        const gamma_type* m_gamma;
+    };
+
+
+    //==================================================pixfmt_alpha_blend_rgb
+    template<class Blender, class RenBuf, unsigned Step, unsigned Offset = 0> 
+    class pixfmt_alpha_blend_rgb
+    {
+    public:
+        typedef pixfmt_rgb_tag pixfmt_category;
+        typedef RenBuf   rbuf_type;
+        typedef Blender  blender_type;
+        typedef typename rbuf_type::row_data row_data;
+        typedef typename blender_type::color_type color_type;
+        typedef typename blender_type::order_type order_type;
+        typedef typename color_type::value_type value_type;
+        typedef typename color_type::calc_type calc_type;
+        enum 
+        {
+            num_components = 3,
+            pix_step = Step,
+            pix_offset = Offset,
+            pix_width = sizeof(value_type) * pix_step
+        };
+        struct pixel_type
+        {
+            value_type c[num_components];
+
+            void set(value_type r, value_type g, value_type b)
+            {
+                c[order_type::R] = r;
+                c[order_type::G] = g;
+                c[order_type::B] = b;
+            }
+
+            void set(const color_type& color)
+            {
+                set(color.r, color.g, color.b);
+            }
+
+            void get(value_type& r, value_type& g, value_type& b) const
+            {
+                r = c[order_type::R];
+                g = c[order_type::G];
+                b = c[order_type::B];
+            }
+
+            color_type get() const
+            {
+                return color_type(
+                    c[order_type::R], 
+                    c[order_type::G], 
+                    c[order_type::B]);
+            }
+
+            pixel_type* next()
+            {
+                return (pixel_type*)(c + pix_step);
+            }
+
+            const pixel_type* next() const
+            {
+                return (const pixel_type*)(c + pix_step);
+            }
+
+            pixel_type* advance(int n)
+            {
+                return (pixel_type*)(c + n * pix_step);
+            }
+
+            const pixel_type* advance(int n) const
+            {
+                return (const pixel_type*)(c + n * pix_step);
+            }
+        };
+
+    private:
+        //--------------------------------------------------------------------
+        AGG_INLINE void blend_pix(pixel_type* p, 
+            value_type r, value_type g, value_type b, value_type a, 
+            unsigned cover)
+        {
+            m_blender.blend_pix(p->c, r, g, b, a, cover);
+        }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE void blend_pix(pixel_type* p, 
+            value_type r, value_type g, value_type b, value_type a)
+        {
+            m_blender.blend_pix(p->c, r, g, b, a);
+        }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE void blend_pix(pixel_type* p, const color_type& c, unsigned cover)
+        {
+            m_blender.blend_pix(p->c, c.r, c.g, c.b, c.a, cover);
+        }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE void blend_pix(pixel_type* p, const color_type& c)
+        {
+            m_blender.blend_pix(p->c, c.r, c.g, c.b, c.a);
+        }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE void copy_or_blend_pix(pixel_type* p, const color_type& c, unsigned cover)
+        {
+            if (!c.is_transparent())
+            {
+                if (c.is_opaque() && cover == cover_mask)
+                {
+                    p->set(c);
+                }
+                else
+                {
+                    blend_pix(p, c, cover);
+                }
+            }
+        }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE void copy_or_blend_pix(pixel_type* p, const color_type& c)
+        {
+            if (!c.is_transparent())
+            {
+                if (c.is_opaque())
+                {
+                    p->set(c);
+                }
+                else
+                {
+                    blend_pix(p, c);
+                }
+            }
+        }
+
+    public:
+        //--------------------------------------------------------------------
+        explicit pixfmt_alpha_blend_rgb(rbuf_type& rb) :
+            m_rbuf(&rb)
+        {}
+        void attach(rbuf_type& rb) { m_rbuf = &rb; }
+
+        //--------------------------------------------------------------------
+        template<class PixFmt>
+        bool attach(PixFmt& pixf, int x1, int y1, int x2, int y2)
+        {
+            rect_i r(x1, y1, x2, y2);
+            if (r.clip(rect_i(0, 0, pixf.width()-1, pixf.height()-1)))
+            {
+                int stride = pixf.stride();
+                m_rbuf->attach(pixf.pix_ptr(r.x1, stride < 0 ? r.y2 : r.y1), 
+                               (r.x2 - r.x1) + 1,
+                               (r.y2 - r.y1) + 1,
+                               stride);
+                return true;
+            }
+            return false;
+        }
+
+        //--------------------------------------------------------------------
+        Blender& blender() { return m_blender; }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE unsigned width()  const { return m_rbuf->width();  }
+        AGG_INLINE unsigned height() const { return m_rbuf->height(); }
+        AGG_INLINE int      stride() const { return m_rbuf->stride(); }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE       int8u* row_ptr(int y)       { return m_rbuf->row_ptr(y); }
+        AGG_INLINE const int8u* row_ptr(int y) const { return m_rbuf->row_ptr(y); }
+        AGG_INLINE row_data     row(int y)     const { return m_rbuf->row(y); }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE int8u* pix_ptr(int x, int y) 
+        { 
+            return m_rbuf->row_ptr(y) + sizeof(value_type) * (x * pix_step + pix_offset);
+        }
+
+        AGG_INLINE const int8u* pix_ptr(int x, int y) const 
+        { 
+            return m_rbuf->row_ptr(y) + sizeof(value_type) * (x * pix_step + pix_offset);
+        }
+
+        // Return pointer to pixel value, forcing row to be allocated.
+        AGG_INLINE pixel_type* pix_value_ptr(int x, int y, unsigned len) 
+        {
+            return (pixel_type*)(m_rbuf->row_ptr(x, y, len) + sizeof(value_type) * (x * pix_step + pix_offset));
+        }
+
+        // Return pointer to pixel value, or null if row not allocated.
+        AGG_INLINE const pixel_type* pix_value_ptr(int x, int y) const 
+        {
+            int8u* p = m_rbuf->row_ptr(y);
+            return p ? (pixel_type*)(p + sizeof(value_type) * (x * pix_step + pix_offset)) : 0;
+        }
+
+        // Get pixel pointer from raw buffer pointer.
+        AGG_INLINE static pixel_type* pix_value_ptr(void* p) 
+        {
+            return (pixel_type*)((value_type*)p + pix_offset);
+        }
+
+        // Get pixel pointer from raw buffer pointer.
+        AGG_INLINE static const pixel_type* pix_value_ptr(const void* p) 
+        {
+            return (const pixel_type*)((const value_type*)p + pix_offset);
+        }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE static void write_plain_color(void* p, color_type c)
+        {
+            // RGB formats are implicitly premultiplied.
+            c.premultiply();
+            pix_value_ptr(p)->set(c);
+        }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE static color_type read_plain_color(const void* p)
+        {
+            return pix_value_ptr(p)->get();
+        }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE static void make_pix(int8u* p, const color_type& c)
+        {
+            ((pixel_type*)p)->set(c);
+        }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE color_type pixel(int x, int y) const
+        {
+            if (const pixel_type* p = pix_value_ptr(x, y))
+            {
+                return p->get();
+            }
+            return color_type::no_color();
+        }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE void copy_pixel(int x, int y, const color_type& c)
+        {
+            pix_value_ptr(x, y, 1)->set(c);
+        }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE void blend_pixel(int x, int y, const color_type& c, int8u cover)
+        {
+            copy_or_blend_pix(pix_value_ptr(x, y, 1), c, cover);
+        }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE void copy_hline(int x, int y, 
+                                   unsigned len, 
+                                   const color_type& c)
+        {
+            pixel_type* p = pix_value_ptr(x, y, len);
+            do
+            {
+                p->set(c);
+                p = p->next();
+            }
+            while(--len);
+        }
+
+
+        //--------------------------------------------------------------------
+        AGG_INLINE void copy_vline(int x, int y,
+                                   unsigned len, 
+                                   const color_type& c)
+        {
+            do
+            {
+                pix_value_ptr(x, y++, 1)->set(c);
+            }
+            while (--len);
+        }
+
+        //--------------------------------------------------------------------
+        void blend_hline(int x, int y,
+                         unsigned len, 
+                         const color_type& c,
+                         int8u cover)
+        {
+            if (!c.is_transparent())
+            {
+                pixel_type* p = pix_value_ptr(x, y, len);
+
+                if (c.is_opaque() && cover == cover_mask)
+                {
+                    do
+                    {
+                        p->set(c);
+                        p = p->next();
+                    }
+                    while (--len);
+                }
+                else
+                {
+                    do
+                    {
+                        blend_pix(p, c, cover);
+                        p = p->next();
+                    }
+                    while (--len);
+                }
+            }
+        }
+
+
+        //--------------------------------------------------------------------
+        void blend_vline(int x, int y,
+                         unsigned len, 
+                         const color_type& c,
+                         int8u cover)
+        {
+            if (!c.is_transparent())
+            {
+                if (c.is_opaque() && cover == cover_mask)
+                {
+                    do
+                    {
+                        pix_value_ptr(x, y++, 1)->set(c);
+                    }
+                    while (--len);
+                }
+                else
+                {
+                    do
+                    {
+                        blend_pix(pix_value_ptr(x, y++, 1), c, cover);
+                    }
+                    while (--len);
+                }
+            }
+        }
+
+        //--------------------------------------------------------------------
+        void blend_solid_hspan(int x, int y,
+                               unsigned len, 
+                               const color_type& c,
+                               const int8u* covers)
+        {
+            if (!c.is_transparent())
+            {
+                pixel_type* p = pix_value_ptr(x, y, len);
+
+                do 
+                {
+                    if (c.is_opaque() && *covers == cover_mask)
+                    {
+                        p->set(c);
+                    }
+                    else
+                    {
+                        blend_pix(p, c, *covers);
+                    }
+                    p = p->next();
+                    ++covers;
+                }
+                while (--len);
+            }
+        }
+
+
+        //--------------------------------------------------------------------
+        void blend_solid_vspan(int x, int y,
+                               unsigned len, 
+                               const color_type& c,
+                               const int8u* covers)
+        {
+            if (!c.is_transparent())
+            {
+                do 
+                {
+                    pixel_type* p = pix_value_ptr(x, y++, 1);
+
+                    if (c.is_opaque() && *covers == cover_mask)
+                    {
+                        p->set(c);
+                    }
+                    else
+                    {
+                        blend_pix(p, c, *covers);
+                    }
+                    ++covers;
+                }
+                while (--len);
+            }
+        }
+
+        //--------------------------------------------------------------------
+        void copy_color_hspan(int x, int y,
+                              unsigned len, 
+                              const color_type* colors)
+        {
+            pixel_type* p = pix_value_ptr(x, y, len);
+
+            do 
+            {
+                p->set(*colors++);
+                p = p->next();
+            }
+            while (--len);
+        }
+
+
+        //--------------------------------------------------------------------
+        void copy_color_vspan(int x, int y,
+                              unsigned len, 
+                              const color_type* colors)
+        {
+            do 
+            {
+                pix_value_ptr(x, y++, 1)->set(*colors++);
+            }
+            while (--len);
+        }
+
+        //--------------------------------------------------------------------
+        void blend_color_hspan(int x, int y,
+                               unsigned len, 
+                               const color_type* colors,
+                               const int8u* covers,
+                               int8u cover)
+        {
+            pixel_type* p = pix_value_ptr(x, y, len);
+
+            if (covers)
+            {
+                do 
+                {
+                    copy_or_blend_pix(p, *colors++, *covers++);
+                    p = p->next();
+                }
+                while (--len);
+            }
+            else
+            {
+                if (cover == cover_mask)
+                {
+                    do 
+                    {
+                        copy_or_blend_pix(p, *colors++);
+                        p = p->next();
+                    }
+                    while (--len);
+                }
+                else
+                {
+                    do 
+                    {
+                        copy_or_blend_pix(p, *colors++, cover);
+                        p = p->next();
+                    }
+                    while (--len);
+                }
+            }
+        }
+
+        //--------------------------------------------------------------------
+        void blend_color_vspan(int x, int y,
+                               unsigned len, 
+                               const color_type* colors,
+                               const int8u* covers,
+                               int8u cover)
+        {
+            if (covers)
+            {
+                do 
+                {
+                    copy_or_blend_pix(pix_value_ptr(x, y++, 1), *colors++, *covers++);
+                }
+                while (--len);
+            }
+            else
+            {
+                if (cover == cover_mask)
+                {
+                    do 
+                    {
+                        copy_or_blend_pix(pix_value_ptr(x, y++, 1), *colors++);
+                    }
+                    while (--len);
+                }
+                else
+                {
+                    do 
+                    {
+                        copy_or_blend_pix(pix_value_ptr(x, y++, 1), *colors++, cover);
+                    }
+                    while (--len);
+                }
+            }
+        }
+
+        //--------------------------------------------------------------------
+        template<class Function> void for_each_pixel(Function f)
+        {
+            for (unsigned y = 0; y < height(); ++y)
+            {
+                row_data r = m_rbuf->row(y);
+                if (r.ptr)
+                {
+                    unsigned len = r.x2 - r.x1 + 1;
+                    pixel_type* p = pix_value_ptr(r.x1, y, len);
+                    do
+                    {
+                        f(p->c);
+                        p = p->next();
+                    }
+                    while (--len);
+                }
+            }
+        }
+
+        //--------------------------------------------------------------------
+        template<class GammaLut> void apply_gamma_dir(const GammaLut& g)
+        {
+            for_each_pixel(apply_gamma_dir_rgb<color_type, order_type, GammaLut>(g));
+        }
+
+        //--------------------------------------------------------------------
+        template<class GammaLut> void apply_gamma_inv(const GammaLut& g)
+        {
+            for_each_pixel(apply_gamma_inv_rgb<color_type, order_type, GammaLut>(g));
+        }
+
+        //--------------------------------------------------------------------
+        template<class RenBuf2>
+        void copy_from(const RenBuf2& from, 
+                       int xdst, int ydst,
+                       int xsrc, int ysrc,
+                       unsigned len)
+        {
+            if (const int8u* p = from.row_ptr(ysrc))
+            {
+                memmove(m_rbuf->row_ptr(xdst, ydst, len) + xdst * pix_width, 
+                        p + xsrc * pix_width, 
+                        len * pix_width);
+            }
+        }
+
+        //--------------------------------------------------------------------
+        // Blend from an RGBA surface.
+        template<class SrcPixelFormatRenderer>
+        void blend_from(const SrcPixelFormatRenderer& from, 
+                        int xdst, int ydst,
+                        int xsrc, int ysrc,
+                        unsigned len,
+                        int8u cover)
+        {
+            typedef typename SrcPixelFormatRenderer::pixel_type src_pixel_type;
+            typedef typename SrcPixelFormatRenderer::order_type src_order;
+
+            if (const src_pixel_type* psrc = from.pix_value_ptr(xsrc, ysrc))
+            {
+                pixel_type* pdst = pix_value_ptr(xdst, ydst, len);
+
+                if (cover == cover_mask)
+                {
+                    do 
+                    {
+                        value_type alpha = psrc->c[src_order::A];
+                        if (alpha <= color_type::empty_value())
+                        {
+                            if (alpha >= color_type::full_value())
+                            {
+                                pdst->c[order_type::R] = psrc->c[src_order::R];
+                                pdst->c[order_type::G] = psrc->c[src_order::G];
+                                pdst->c[order_type::B] = psrc->c[src_order::B];
+                            }
+                            else
+                            {
+                                blend_pix(pdst, 
+                                    psrc->c[src_order::R],
+                                    psrc->c[src_order::G],
+                                    psrc->c[src_order::B],
+                                    alpha);
+                            }
+                        }
+                        psrc = psrc->next();
+                        pdst = pdst->next();
+                    }
+                    while(--len);
+                }
+                else
+                {
+                    do 
+                    {
+                        copy_or_blend_pix(pdst, psrc->get(), cover);
+                        psrc = psrc->next();
+                        pdst = pdst->next();
+                    }
+                    while (--len);
+                }
+            }
+        }
+
+        //--------------------------------------------------------------------
+        // Blend from single color, using grayscale surface as alpha channel.
+        template<class SrcPixelFormatRenderer>
+        void blend_from_color(const SrcPixelFormatRenderer& from, 
+                              const color_type& color,
+                              int xdst, int ydst,
+                              int xsrc, int ysrc,
+                              unsigned len,
+                              int8u cover)
+        {
+            typedef typename SrcPixelFormatRenderer::pixel_type src_pixel_type;
+            typedef typename SrcPixelFormatRenderer::color_type src_color_type;
+
+            if (const src_pixel_type* psrc = from.pix_value_ptr(xsrc, ysrc))
+            {
+                pixel_type* pdst = pix_value_ptr(xdst, ydst, len);
+
+                do 
+                {
+                    copy_or_blend_pix(pdst, color, src_color_type::scale_cover(cover, psrc->c[0]));
+                    psrc = psrc->next();
+                    pdst = pdst->next();
+                }
+                while (--len);
+            }
+        }
+
+        //--------------------------------------------------------------------
+        // Blend from color table, using grayscale surface as indexes into table. 
+        // Obviously, this only works for integer value types.
+        template<class SrcPixelFormatRenderer>
+        void blend_from_lut(const SrcPixelFormatRenderer& from, 
+                            const color_type* color_lut,
+                            int xdst, int ydst,
+                            int xsrc, int ysrc,
+                            unsigned len,
+                            int8u cover)
+        {
+            typedef typename SrcPixelFormatRenderer::pixel_type src_pixel_type;
+
+            if (const src_pixel_type* psrc = from.pix_value_ptr(xsrc, ysrc))
+            {
+                pixel_type* pdst = pix_value_ptr(xdst, ydst, len);
+
+                if (cover == cover_mask)
+                {
+                    do 
+                    {
+                        const color_type& color = color_lut[psrc->c[0]];
+                        blend_pix(pdst, color);
+                        psrc = psrc->next();
+                        pdst = pdst->next();
+                    }
+                    while(--len);
+                }
+                else
+                {
+                    do 
+                    {
+                        copy_or_blend_pix(pdst, color_lut[psrc->c[0]], cover);
+                        psrc = psrc->next();
+                        pdst = pdst->next();
+                    }
+                    while(--len);
+                }
+            }
+        }
+
+    private:
+        rbuf_type* m_rbuf;
+        Blender    m_blender;
+    };
+    
+    //-----------------------------------------------------------------------
+    typedef blender_rgb<rgba8, order_rgb> blender_rgb24;
+    typedef blender_rgb<rgba8, order_bgr> blender_bgr24;
+    typedef blender_rgb<srgba8, order_rgb> blender_srgb24;
+    typedef blender_rgb<srgba8, order_bgr> blender_sbgr24;
+    typedef blender_rgb<rgba16, order_rgb> blender_rgb48;
+    typedef blender_rgb<rgba16, order_bgr> blender_bgr48;
+    typedef blender_rgb<rgba32, order_rgb> blender_rgb96;
+    typedef blender_rgb<rgba32, order_bgr> blender_bgr96;
+
+    typedef blender_rgb_pre<rgba8, order_rgb> blender_rgb24_pre;
+    typedef blender_rgb_pre<rgba8, order_bgr> blender_bgr24_pre;
+    typedef blender_rgb_pre<srgba8, order_rgb> blender_srgb24_pre;
+    typedef blender_rgb_pre<srgba8, order_bgr> blender_sbgr24_pre;
+    typedef blender_rgb_pre<rgba16, order_rgb> blender_rgb48_pre;
+    typedef blender_rgb_pre<rgba16, order_bgr> blender_bgr48_pre;
+    typedef blender_rgb_pre<rgba32, order_rgb> blender_rgb96_pre;
+    typedef blender_rgb_pre<rgba32, order_bgr> blender_bgr96_pre;
+
+    typedef pixfmt_alpha_blend_rgb<blender_rgb24, rendering_buffer, 3> pixfmt_rgb24;
+    typedef pixfmt_alpha_blend_rgb<blender_bgr24, rendering_buffer, 3> pixfmt_bgr24;
+    typedef pixfmt_alpha_blend_rgb<blender_srgb24, rendering_buffer, 3> pixfmt_srgb24;
+    typedef pixfmt_alpha_blend_rgb<blender_sbgr24, rendering_buffer, 3> pixfmt_sbgr24;
+    typedef pixfmt_alpha_blend_rgb<blender_rgb48, rendering_buffer, 3> pixfmt_rgb48;
+    typedef pixfmt_alpha_blend_rgb<blender_bgr48, rendering_buffer, 3> pixfmt_bgr48;
+    typedef pixfmt_alpha_blend_rgb<blender_rgb96, rendering_buffer, 3> pixfmt_rgb96;
+    typedef pixfmt_alpha_blend_rgb<blender_bgr96, rendering_buffer, 3> pixfmt_bgr96;
+
+    typedef pixfmt_alpha_blend_rgb<blender_rgb24_pre, rendering_buffer, 3> pixfmt_rgb24_pre;
+    typedef pixfmt_alpha_blend_rgb<blender_bgr24_pre, rendering_buffer, 3> pixfmt_bgr24_pre;
+    typedef pixfmt_alpha_blend_rgb<blender_srgb24_pre, rendering_buffer, 3> pixfmt_srgb24_pre;
+    typedef pixfmt_alpha_blend_rgb<blender_sbgr24_pre, rendering_buffer, 3> pixfmt_sbgr24_pre;
+    typedef pixfmt_alpha_blend_rgb<blender_rgb48_pre, rendering_buffer, 3> pixfmt_rgb48_pre;
+    typedef pixfmt_alpha_blend_rgb<blender_bgr48_pre, rendering_buffer, 3> pixfmt_bgr48_pre;
+    typedef pixfmt_alpha_blend_rgb<blender_rgb96_pre, rendering_buffer, 3> pixfmt_rgb96_pre;
+    typedef pixfmt_alpha_blend_rgb<blender_bgr96_pre, rendering_buffer, 3> pixfmt_bgr96_pre;
+
+    typedef pixfmt_alpha_blend_rgb<blender_rgb24, rendering_buffer, 4, 0> pixfmt_rgbx32;
+    typedef pixfmt_alpha_blend_rgb<blender_rgb24, rendering_buffer, 4, 1> pixfmt_xrgb32;
+    typedef pixfmt_alpha_blend_rgb<blender_bgr24, rendering_buffer, 4, 1> pixfmt_xbgr32;
+    typedef pixfmt_alpha_blend_rgb<blender_bgr24, rendering_buffer, 4, 0> pixfmt_bgrx32;
+    typedef pixfmt_alpha_blend_rgb<blender_srgb24, rendering_buffer, 4, 0> pixfmt_srgbx32;
+    typedef pixfmt_alpha_blend_rgb<blender_srgb24, rendering_buffer, 4, 1> pixfmt_sxrgb32;
+    typedef pixfmt_alpha_blend_rgb<blender_sbgr24, rendering_buffer, 4, 1> pixfmt_sxbgr32;
+    typedef pixfmt_alpha_blend_rgb<blender_sbgr24, rendering_buffer, 4, 0> pixfmt_sbgrx32;
+    typedef pixfmt_alpha_blend_rgb<blender_rgb48, rendering_buffer, 4, 0> pixfmt_rgbx64;
+    typedef pixfmt_alpha_blend_rgb<blender_rgb48, rendering_buffer, 4, 1> pixfmt_xrgb64;
+    typedef pixfmt_alpha_blend_rgb<blender_bgr48, rendering_buffer, 4, 1> pixfmt_xbgr64;
+    typedef pixfmt_alpha_blend_rgb<blender_bgr48, rendering_buffer, 4, 0> pixfmt_bgrx64;
+    typedef pixfmt_alpha_blend_rgb<blender_rgb96, rendering_buffer, 4, 0> pixfmt_rgbx128;
+    typedef pixfmt_alpha_blend_rgb<blender_rgb96, rendering_buffer, 4, 1> pixfmt_xrgb128;
+    typedef pixfmt_alpha_blend_rgb<blender_bgr96, rendering_buffer, 4, 1> pixfmt_xbgr128;
+    typedef pixfmt_alpha_blend_rgb<blender_bgr96, rendering_buffer, 4, 0> pixfmt_bgrx128;
+
+    typedef pixfmt_alpha_blend_rgb<blender_rgb24_pre, rendering_buffer, 4, 0> pixfmt_rgbx32_pre;
+    typedef pixfmt_alpha_blend_rgb<blender_rgb24_pre, rendering_buffer, 4, 1> pixfmt_xrgb32_pre;
+    typedef pixfmt_alpha_blend_rgb<blender_bgr24_pre, rendering_buffer, 4, 1> pixfmt_xbgr32_pre;
+    typedef pixfmt_alpha_blend_rgb<blender_bgr24_pre, rendering_buffer, 4, 0> pixfmt_bgrx32_pre;
+    typedef pixfmt_alpha_blend_rgb<blender_srgb24_pre, rendering_buffer, 4, 0> pixfmt_srgbx32_pre;
+    typedef pixfmt_alpha_blend_rgb<blender_srgb24_pre, rendering_buffer, 4, 1> pixfmt_sxrgb32_pre;
+    typedef pixfmt_alpha_blend_rgb<blender_sbgr24_pre, rendering_buffer, 4, 1> pixfmt_sxbgr32_pre;
+    typedef pixfmt_alpha_blend_rgb<blender_sbgr24_pre, rendering_buffer, 4, 0> pixfmt_sbgrx32_pre;
+    typedef pixfmt_alpha_blend_rgb<blender_rgb48_pre, rendering_buffer, 4, 0> pixfmt_rgbx64_pre;
+    typedef pixfmt_alpha_blend_rgb<blender_rgb48_pre, rendering_buffer, 4, 1> pixfmt_xrgb64_pre;
+    typedef pixfmt_alpha_blend_rgb<blender_bgr48_pre, rendering_buffer, 4, 1> pixfmt_xbgr64_pre;
+    typedef pixfmt_alpha_blend_rgb<blender_bgr48_pre, rendering_buffer, 4, 0> pixfmt_bgrx64_pre;
+    typedef pixfmt_alpha_blend_rgb<blender_rgb96_pre, rendering_buffer, 4, 0> pixfmt_rgbx128_pre;
+    typedef pixfmt_alpha_blend_rgb<blender_rgb96_pre, rendering_buffer, 4, 1> pixfmt_xrgb128_pre;
+    typedef pixfmt_alpha_blend_rgb<blender_bgr96_pre, rendering_buffer, 4, 1> pixfmt_xbgr128_pre;
+    typedef pixfmt_alpha_blend_rgb<blender_bgr96_pre, rendering_buffer, 4, 0> pixfmt_bgrx128_pre;
+    
+
+    //-----------------------------------------------------pixfmt_rgb24_gamma
+    template<class Gamma> class pixfmt_rgb24_gamma : 
+    public pixfmt_alpha_blend_rgb<blender_rgb_gamma<rgba8, order_rgb, Gamma>, rendering_buffer, 3>
+    {
+    public:
+        pixfmt_rgb24_gamma(rendering_buffer& rb, const Gamma& g) :
+            pixfmt_alpha_blend_rgb<blender_rgb_gamma<rgba8, order_rgb, Gamma>, rendering_buffer, 3>(rb) 
+        {
+            this->blender().gamma(g);
+        }
+    };
+        
+    //-----------------------------------------------------pixfmt_srgb24_gamma
+    template<class Gamma> class pixfmt_srgb24_gamma : 
+    public pixfmt_alpha_blend_rgb<blender_rgb_gamma<srgba8, order_rgb, Gamma>, rendering_buffer, 3>
+    {
+    public:
+        pixfmt_srgb24_gamma(rendering_buffer& rb, const Gamma& g) :
+            pixfmt_alpha_blend_rgb<blender_rgb_gamma<srgba8, order_rgb, Gamma>, rendering_buffer, 3>(rb) 
+        {
+            this->blender().gamma(g);
+        }
+    };
+        
+    //-----------------------------------------------------pixfmt_bgr24_gamma
+    template<class Gamma> class pixfmt_bgr24_gamma : 
+    public pixfmt_alpha_blend_rgb<blender_rgb_gamma<rgba8, order_bgr, Gamma>, rendering_buffer, 3>
+    {
+    public:
+        pixfmt_bgr24_gamma(rendering_buffer& rb, const Gamma& g) :
+            pixfmt_alpha_blend_rgb<blender_rgb_gamma<rgba8, order_bgr, Gamma>, rendering_buffer, 3>(rb) 
+        {
+            this->blender().gamma(g);
+        }
+    };
+
+    //-----------------------------------------------------pixfmt_sbgr24_gamma
+    template<class Gamma> class pixfmt_sbgr24_gamma : 
+    public pixfmt_alpha_blend_rgb<blender_rgb_gamma<srgba8, order_bgr, Gamma>, rendering_buffer, 3>
+    {
+    public:
+        pixfmt_sbgr24_gamma(rendering_buffer& rb, const Gamma& g) :
+            pixfmt_alpha_blend_rgb<blender_rgb_gamma<srgba8, order_bgr, Gamma>, rendering_buffer, 3>(rb) 
+        {
+            this->blender().gamma(g);
+        }
+    };
+
+    //-----------------------------------------------------pixfmt_rgb48_gamma
+    template<class Gamma> class pixfmt_rgb48_gamma : 
+    public pixfmt_alpha_blend_rgb<blender_rgb_gamma<rgba16, order_rgb, Gamma>, rendering_buffer, 3>
+    {
+    public:
+        pixfmt_rgb48_gamma(rendering_buffer& rb, const Gamma& g) :
+            pixfmt_alpha_blend_rgb<blender_rgb_gamma<rgba16, order_rgb, Gamma>, rendering_buffer, 3>(rb) 
+        {
+            this->blender().gamma(g);
+        }
+    };
+        
+    //-----------------------------------------------------pixfmt_bgr48_gamma
+    template<class Gamma> class pixfmt_bgr48_gamma : 
+    public pixfmt_alpha_blend_rgb<blender_rgb_gamma<rgba16, order_bgr, Gamma>, rendering_buffer, 3>
+    {
+    public:
+        pixfmt_bgr48_gamma(rendering_buffer& rb, const Gamma& g) :
+            pixfmt_alpha_blend_rgb<blender_rgb_gamma<rgba16, order_bgr, Gamma>, rendering_buffer, 3>(rb) 
+        {
+            this->blender().gamma(g);
+        }
+    };
+    
+}
+
+#endif
+

3rd/agg/include/agg_platform_support.h

@@ -0,0 +1,148 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// class platform_support
+//
+// It's not a part of the AGG library, it's just a helper class to create 
+// interactive demo examples. Since the examples should not be too complex
+// this class is provided to support some very basic interactive graphical
+// funtionality, such as putting the rendered image to the window, simple 
+// keyboard and mouse input, window resizing, setting the window title,
+// and catching the "idle" events.
+// 
+// The idea is to have a single header file that does not depend on any 
+// platform (I hate these endless #ifdef/#elif/#elif.../#endif) and a number
+// of different implementations depending on the concrete platform. 
+// The most popular platforms are:
+//
+// Windows-32 API
+// X-Window API
+// SDL library (see http://www.libsdl.org/)
+// MacOS C/C++ API
+// 
+// This file does not include any system dependent .h files such as
+// windows.h or X11.h, so, your demo applications do not depend on the
+// platform. The only file that can #include system dependend headers
+// is the implementation file agg_platform_support.cpp. Different
+// implementations are placed in different directories, such as
+// ~/agg/src/platform/win32
+// ~/agg/src/platform/sdl
+// ~/agg/src/platform/X11
+// and so on.
+//
+// All the system dependent stuff sits in the platform_specific 
+// class which is forward-declared here but not defined. 
+// The platform_support class has just a pointer to it and it's 
+// the responsibility of the implementation to create/delete it.
+// This class being defined in the implementation file can have 
+// any platform dependent stuff such as HWND, X11 Window and so on.
+//
+//----------------------------------------------------------------------------
+
+
+#ifndef AGG_PLATFORM_SUPPORT_INCLUDED
+#define AGG_PLATFORM_SUPPORT_INCLUDED
+
+
+#include "agg_basics.h"
+#include "agg_rendering_buffer.h"
+#include "agg_trans_viewport.h"
+
+namespace agg
+{
+
+    //----------------------------------------------------------window_flag_e
+    // These are flags used in method init(). Not all of them are
+    // applicable on different platforms, for example the win32_api
+    // cannot use a hardware buffer (window_hw_buffer).
+    // The implementation should simply ignore unsupported flags.
+    enum window_flag_e
+    {
+        window_resize            = 1,
+        window_hw_buffer         = 2,
+        window_keep_aspect_ratio = 4,
+        window_process_all_keys  = 8
+    };
+
+    //-----------------------------------------------------------pix_format_e
+    // Possible formats of the rendering buffer. Initially I thought that it's
+    // reasonable to create the buffer and the rendering functions in 
+    // accordance with the native pixel format of the system because it 
+    // would have no overhead for pixel format conersion. 
+    // But eventually I came to a conclusion that having a possibility to 
+    // convert pixel formats on demand is a good idea. First, it was X11 where 
+    // there lots of different formats and visuals and it would be great to 
+    // render everything in, say, RGB-24 and display it automatically without
+    // any additional efforts. The second reason is to have a possibility to 
+    // debug renderers for different pixel formats and colorspaces having only 
+    // one computer and one system.
+    //
+    // This stuff is not included into the basic AGG functionality because the 
+    // number of supported pixel formats (and/or colorspaces) can be great and 
+    // if one needs to add new format it would be good only to add new 
+    // rendering files without having to modify any existing ones (a general 
+    // principle of incapsulation and isolation).
+    //
+    // Using a particular pixel format doesn't obligatory mean the necessity
+    // of software conversion. For example, win32 API can natively display 
+    // gray8, 15-bit RGB, 24-bit BGR, and 32-bit BGRA formats. 
+    // This list can be (and will be!) extended in future.
+    enum pix_format_e
+    {
+        pix_format_undefined = 0,  // By default. No conversions are applied 
+        pix_format_bw,             // 1 bit per color B/W
+        pix_format_gray8,          // Simple 256 level grayscale
+        pix_format_sgray8,         // Simple 256 level grayscale (sRGB)
+        pix_format_gray16,         // Simple 65535 level grayscale
+        pix_format_gray32,         // Grayscale, one 32-bit float per pixel
+        pix_format_rgb555,         // 15 bit rgb. Depends on the byte ordering!
+        pix_format_rgb565,         // 16 bit rgb. Depends on the byte ordering!
+        pix_format_rgbAAA,         // 30 bit rgb. Depends on the byte ordering!
+        pix_format_rgbBBA,         // 32 bit rgb. Depends on the byte ordering!
+        pix_format_bgrAAA,         // 30 bit bgr. Depends on the byte ordering!
+        pix_format_bgrABB,         // 32 bit bgr. Depends on the byte ordering!
+        pix_format_rgb24,          // R-G-B, one byte per color component
+        pix_format_srgb24,         // R-G-B, one byte per color component (sRGB)
+        pix_format_bgr24,          // B-G-R, one byte per color component
+        pix_format_sbgr24,         // B-G-R, native win32 BMP format (sRGB)
+        pix_format_rgba32,         // R-G-B-A, one byte per color component
+        pix_format_srgba32,        // R-G-B-A, one byte per color component (sRGB)
+        pix_format_argb32,         // A-R-G-B, native MAC format
+        pix_format_sargb32,        // A-R-G-B, native MAC format (sRGB)
+        pix_format_abgr32,         // A-B-G-R, one byte per color component
+        pix_format_sabgr32,        // A-B-G-R, one byte per color component (sRGB)
+        pix_format_bgra32,         // B-G-R-A, native win32 BMP format
+        pix_format_sbgra32,        // B-G-R-A, native win32 BMP format (sRGB)
+        pix_format_rgb48,          // R-G-B, 16 bits per color component
+        pix_format_bgr48,          // B-G-R, native win32 BMP format.
+        pix_format_rgb96,          // R-G-B, one 32-bit float per color component
+        pix_format_bgr96,          // B-G-R, one 32-bit float per color component
+        pix_format_rgba64,         // R-G-B-A, 16 bits byte per color component
+        pix_format_argb64,         // A-R-G-B, native MAC format
+        pix_format_abgr64,         // A-B-G-R, one byte per color component
+        pix_format_bgra64,         // B-G-R-A, native win32 BMP format
+        pix_format_rgba128,        // R-G-B-A, one 32-bit float per color component
+        pix_format_argb128,        // A-R-G-B, one 32-bit float per color component
+        pix_format_abgr128,        // A-B-G-R, one 32-bit float per color component
+        pix_format_bgra128,        // B-G-R-A, one 32-bit float per color component
+  
+        end_of_pix_formats
+    };
+}
+
+
+
+#endif
+

3rd/agg/include/agg_rasterizer_cells_aa.h

@@ -0,0 +1,738 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+//
+// The author gratefully acknowleges the support of David Turner, 
+// Robert Wilhelm, and Werner Lemberg - the authors of the FreeType 
+// libray - in producing this work. See http://www.freetype.org for details.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// Adaptation for 32-bit screen coordinates has been sponsored by 
+// Liberty Technology Systems, Inc., visit http://lib-sys.com
+//
+// Liberty Technology Systems, Inc. is the provider of
+// PostScript and PDF technology for software developers.
+// 
+//----------------------------------------------------------------------------
+#ifndef AGG_RASTERIZER_CELLS_AA_INCLUDED
+#define AGG_RASTERIZER_CELLS_AA_INCLUDED
+
+#include <string.h>
+#include <math.h>
+#include "agg_math.h"
+#include "agg_array.h"
+
+
+namespace agg
+{
+
+    //-----------------------------------------------------rasterizer_cells_aa
+    // An internal class that implements the main rasterization algorithm.
+    // Used in the rasterizer. Should not be used direcly.
+    template<class Cell> class rasterizer_cells_aa
+    {
+        enum cell_block_scale_e
+        {
+            cell_block_shift = 12,
+            cell_block_size  = 1 << cell_block_shift,
+            cell_block_mask  = cell_block_size - 1,
+            cell_block_pool  = 256,
+            cell_block_limit = 1024
+        };
+
+        struct sorted_y
+        {
+            unsigned start;
+            unsigned num;
+        };
+
+    public:
+        typedef Cell cell_type;
+        typedef rasterizer_cells_aa<Cell> self_type;
+
+        ~rasterizer_cells_aa();
+        rasterizer_cells_aa();
+
+        void reset();
+        void style(const cell_type& style_cell);
+        void line(int x1, int y1, int x2, int y2);
+
+        int min_x() const { return m_min_x; }
+        int min_y() const { return m_min_y; }
+        int max_x() const { return m_max_x; }
+        int max_y() const { return m_max_y; }
+
+        void sort_cells();
+
+        unsigned total_cells() const 
+        {
+            return m_num_cells;
+        }
+
+        unsigned scanline_num_cells(unsigned y) const 
+        { 
+            return m_sorted_y[y - m_min_y].num; 
+        }
+
+        const cell_type* const* scanline_cells(unsigned y) const
+        { 
+            return m_sorted_cells.data() + m_sorted_y[y - m_min_y].start; 
+        }
+
+        bool sorted() const { return m_sorted; }
+
+    private:
+        rasterizer_cells_aa(const self_type&);
+        const self_type& operator = (const self_type&);
+
+        void set_curr_cell(int x, int y);
+        void add_curr_cell();
+        void render_hline(int ey, int x1, int y1, int x2, int y2);
+        void allocate_block();
+        
+    private:
+        unsigned                m_num_blocks;
+        unsigned                m_max_blocks;
+        unsigned                m_curr_block;
+        unsigned                m_num_cells;
+        cell_type**             m_cells;
+        cell_type*              m_curr_cell_ptr;
+        pod_vector<cell_type*>  m_sorted_cells;
+        pod_vector<sorted_y>    m_sorted_y;
+        cell_type               m_curr_cell;
+        cell_type               m_style_cell;
+        int                     m_min_x;
+        int                     m_min_y;
+        int                     m_max_x;
+        int                     m_max_y;
+        bool                    m_sorted;
+    };
+
+
+
+
+    //------------------------------------------------------------------------
+    template<class Cell> 
+    rasterizer_cells_aa<Cell>::~rasterizer_cells_aa()
+    {
+        if(m_num_blocks)
+        {
+            cell_type** ptr = m_cells + m_num_blocks - 1;
+            while(m_num_blocks--)
+            {
+                pod_allocator<cell_type>::deallocate(*ptr, cell_block_size);
+                ptr--;
+            }
+            pod_allocator<cell_type*>::deallocate(m_cells, m_max_blocks);
+        }
+    }
+
+    //------------------------------------------------------------------------
+    template<class Cell> 
+    rasterizer_cells_aa<Cell>::rasterizer_cells_aa() :
+        m_num_blocks(0),
+        m_max_blocks(0),
+        m_curr_block(0),
+        m_num_cells(0),
+        m_cells(0),
+        m_curr_cell_ptr(0),
+        m_sorted_cells(),
+        m_sorted_y(),
+        m_min_x(0x7FFFFFFF),
+        m_min_y(0x7FFFFFFF),
+        m_max_x(-0x7FFFFFFF),
+        m_max_y(-0x7FFFFFFF),
+        m_sorted(false)
+    {
+        m_style_cell.initial();
+        m_curr_cell.initial();
+    }
+
+    //------------------------------------------------------------------------
+    template<class Cell> 
+    void rasterizer_cells_aa<Cell>::reset()
+    {
+        m_num_cells = 0; 
+        m_curr_block = 0;
+        m_curr_cell.initial();
+        m_style_cell.initial();
+        m_sorted = false;
+        m_min_x =  0x7FFFFFFF;
+        m_min_y =  0x7FFFFFFF;
+        m_max_x = -0x7FFFFFFF;
+        m_max_y = -0x7FFFFFFF;
+    }
+
+    //------------------------------------------------------------------------
+    template<class Cell> 
+    AGG_INLINE void rasterizer_cells_aa<Cell>::add_curr_cell()
+    {
+        if(m_curr_cell.area | m_curr_cell.cover)
+        {
+            if((m_num_cells & cell_block_mask) == 0)
+            {
+                if(m_num_blocks >= cell_block_limit) return;
+                allocate_block();
+            }
+            *m_curr_cell_ptr++ = m_curr_cell;
+            ++m_num_cells;
+        }
+    }
+
+    //------------------------------------------------------------------------
+    template<class Cell> 
+    AGG_INLINE void rasterizer_cells_aa<Cell>::set_curr_cell(int x, int y)
+    {
+        if(m_curr_cell.not_equal(x, y, m_style_cell))
+        {
+            add_curr_cell();
+            m_curr_cell.style(m_style_cell);
+            m_curr_cell.x     = x;
+            m_curr_cell.y     = y;
+            m_curr_cell.cover = 0;
+            m_curr_cell.area  = 0;
+        }
+    }
+
+    //------------------------------------------------------------------------
+    template<class Cell> 
+    AGG_INLINE void rasterizer_cells_aa<Cell>::render_hline(int ey, 
+                                                            int x1, int y1, 
+                                                            int x2, int y2)
+    {
+        int ex1 = x1 >> poly_subpixel_shift;
+        int ex2 = x2 >> poly_subpixel_shift;
+        int fx1 = x1 & poly_subpixel_mask;
+        int fx2 = x2 & poly_subpixel_mask;
+
+        int delta, p, first, dx;
+        int incr, lift, mod, rem;
+
+        //trivial case. Happens often
+        if(y1 == y2)
+        {
+            set_curr_cell(ex2, ey);
+            return;
+        }
+
+        //everything is located in a single cell.  That is easy!
+        if(ex1 == ex2)
+        {
+            delta = y2 - y1;
+            m_curr_cell.cover += delta;
+            m_curr_cell.area  += (fx1 + fx2) * delta;
+            return;
+        }
+
+        //ok, we'll have to render a run of adjacent cells on the same
+        //hline...
+        p     = (poly_subpixel_scale - fx1) * (y2 - y1);
+        first = poly_subpixel_scale;
+        incr  = 1;
+
+        dx = x2 - x1;
+
+        if(dx < 0)
+        {
+            p     = fx1 * (y2 - y1);
+            first = 0;
+            incr  = -1;
+            dx    = -dx;
+        }
+
+        delta = p / dx;
+        mod   = p % dx;
+
+        if(mod < 0)
+        {
+            delta--;
+            mod += dx;
+        }
+
+        m_curr_cell.cover += delta;
+        m_curr_cell.area  += (fx1 + first) * delta;
+
+        ex1 += incr;
+        set_curr_cell(ex1, ey);
+        y1  += delta;
+
+        if(ex1 != ex2)
+        {
+            p     = poly_subpixel_scale * (y2 - y1 + delta);
+            lift  = p / dx;
+            rem   = p % dx;
+
+            if (rem < 0)
+            {
+                lift--;
+                rem += dx;
+            }
+
+            mod -= dx;
+
+            while (ex1 != ex2)
+            {
+                delta = lift;
+                mod  += rem;
+                if(mod >= 0)
+                {
+                    mod -= dx;
+                    delta++;
+                }
+
+                m_curr_cell.cover += delta;
+                m_curr_cell.area  += poly_subpixel_scale * delta;
+                y1  += delta;
+                ex1 += incr;
+                set_curr_cell(ex1, ey);
+            }
+        }
+        delta = y2 - y1;
+        m_curr_cell.cover += delta;
+        m_curr_cell.area  += (fx2 + poly_subpixel_scale - first) * delta;
+    }
+
+    //------------------------------------------------------------------------
+    template<class Cell> 
+    AGG_INLINE void rasterizer_cells_aa<Cell>::style(const cell_type& style_cell)
+    { 
+        m_style_cell.style(style_cell); 
+    }
+
+    //------------------------------------------------------------------------
+    template<class Cell> 
+    void rasterizer_cells_aa<Cell>::line(int x1, int y1, int x2, int y2)
+    {
+        enum dx_limit_e { dx_limit = 16384 << poly_subpixel_shift };
+
+        int dx = x2 - x1;
+
+        if(dx >= dx_limit || dx <= -dx_limit)
+        {
+            int cx = (x1 + x2) >> 1;
+            int cy = (y1 + y2) >> 1;
+            line(x1, y1, cx, cy);
+            line(cx, cy, x2, y2);
+        }
+
+        int dy = y2 - y1;
+        int ex1 = x1 >> poly_subpixel_shift;
+        int ex2 = x2 >> poly_subpixel_shift;
+        int ey1 = y1 >> poly_subpixel_shift;
+        int ey2 = y2 >> poly_subpixel_shift;
+        int fy1 = y1 & poly_subpixel_mask;
+        int fy2 = y2 & poly_subpixel_mask;
+
+        int x_from, x_to;
+        int p, rem, mod, lift, delta, first, incr;
+
+        if(ex1 < m_min_x) m_min_x = ex1;
+        if(ex1 > m_max_x) m_max_x = ex1;
+        if(ey1 < m_min_y) m_min_y = ey1;
+        if(ey1 > m_max_y) m_max_y = ey1;
+        if(ex2 < m_min_x) m_min_x = ex2;
+        if(ex2 > m_max_x) m_max_x = ex2;
+        if(ey2 < m_min_y) m_min_y = ey2;
+        if(ey2 > m_max_y) m_max_y = ey2;
+
+        set_curr_cell(ex1, ey1);
+
+        //everything is on a single hline
+        if(ey1 == ey2)
+        {
+            render_hline(ey1, x1, fy1, x2, fy2);
+            return;
+        }
+
+        //Vertical line - we have to calculate start and end cells,
+        //and then - the common values of the area and coverage for
+        //all cells of the line. We know exactly there's only one 
+        //cell, so, we don't have to call render_hline().
+        incr  = 1;
+        if(dx == 0)
+        {
+            int ex = x1 >> poly_subpixel_shift;
+            int two_fx = (x1 - (ex << poly_subpixel_shift)) << 1;
+            int area;
+
+            first = poly_subpixel_scale;
+            if(dy < 0)
+            {
+                first = 0;
+                incr  = -1;
+            }
+
+            x_from = x1;
+
+            //render_hline(ey1, x_from, fy1, x_from, first);
+            delta = first - fy1;
+            m_curr_cell.cover += delta;
+            m_curr_cell.area  += two_fx * delta;
+
+            ey1 += incr;
+            set_curr_cell(ex, ey1);
+
+            delta = first + first - poly_subpixel_scale;
+            area = two_fx * delta;
+            while(ey1 != ey2)
+            {
+                //render_hline(ey1, x_from, poly_subpixel_scale - first, x_from, first);
+                m_curr_cell.cover = delta;
+                m_curr_cell.area  = area;
+                ey1 += incr;
+                set_curr_cell(ex, ey1);
+            }
+            //render_hline(ey1, x_from, poly_subpixel_scale - first, x_from, fy2);
+            delta = fy2 - poly_subpixel_scale + first;
+            m_curr_cell.cover += delta;
+            m_curr_cell.area  += two_fx * delta;
+            return;
+        }
+
+        //ok, we have to render several hlines
+        p     = (poly_subpixel_scale - fy1) * dx;
+        first = poly_subpixel_scale;
+
+        if(dy < 0)
+        {
+            p     = fy1 * dx;
+            first = 0;
+            incr  = -1;
+            dy    = -dy;
+        }
+
+        delta = p / dy;
+        mod   = p % dy;
+
+        if(mod < 0)
+        {
+            delta--;
+            mod += dy;
+        }
+
+        x_from = x1 + delta;
+        render_hline(ey1, x1, fy1, x_from, first);
+
+        ey1 += incr;
+        set_curr_cell(x_from >> poly_subpixel_shift, ey1);
+
+        if(ey1 != ey2)
+        {
+            p     = poly_subpixel_scale * dx;
+            lift  = p / dy;
+            rem   = p % dy;
+
+            if(rem < 0)
+            {
+                lift--;
+                rem += dy;
+            }
+            mod -= dy;
+
+            while(ey1 != ey2)
+            {
+                delta = lift;
+                mod  += rem;
+                if (mod >= 0)
+                {
+                    mod -= dy;
+                    delta++;
+                }
+
+                x_to = x_from + delta;
+                render_hline(ey1, x_from, poly_subpixel_scale - first, x_to, first);
+                x_from = x_to;
+
+                ey1 += incr;
+                set_curr_cell(x_from >> poly_subpixel_shift, ey1);
+            }
+        }
+        render_hline(ey1, x_from, poly_subpixel_scale - first, x2, fy2);
+    }
+
+    //------------------------------------------------------------------------
+    template<class Cell> 
+    void rasterizer_cells_aa<Cell>::allocate_block()
+    {
+        if(m_curr_block >= m_num_blocks)
+        {
+            if(m_num_blocks >= m_max_blocks)
+            {
+                cell_type** new_cells = 
+                    pod_allocator<cell_type*>::allocate(m_max_blocks + 
+                                                        cell_block_pool);
+
+                if(m_cells)
+                {
+                    memcpy(new_cells, m_cells, m_max_blocks * sizeof(cell_type*));
+                    pod_allocator<cell_type*>::deallocate(m_cells, m_max_blocks);
+                }
+                m_cells = new_cells;
+                m_max_blocks += cell_block_pool;
+            }
+
+            m_cells[m_num_blocks++] = 
+                pod_allocator<cell_type>::allocate(cell_block_size);
+
+        }
+        m_curr_cell_ptr = m_cells[m_curr_block++];
+    }
+
+
+
+    //------------------------------------------------------------------------
+    template <class T> static AGG_INLINE void swap_cells(T* a, T* b)
+    {
+        T temp = *a;
+        *a = *b;
+        *b = temp;
+    }
+
+
+    //------------------------------------------------------------------------
+    enum
+    {
+        qsort_threshold = 9
+    };
+
+
+    //------------------------------------------------------------------------
+    template<class Cell>
+    void qsort_cells(Cell** start, unsigned num)
+    {
+        Cell**  stack[80];
+        Cell*** top; 
+        Cell**  limit;
+        Cell**  base;
+
+        limit = start + num;
+        base  = start;
+        top   = stack;
+
+        for (;;)
+        {
+            int len = int(limit - base);
+
+            Cell** i;
+            Cell** j;
+            Cell** pivot;
+
+            if(len > qsort_threshold)
+            {
+                // we use base + len/2 as the pivot
+                pivot = base + len / 2;
+                swap_cells(base, pivot);
+
+                i = base + 1;
+                j = limit - 1;
+
+                // now ensure that *i <= *base <= *j 
+                if((*j)->x < (*i)->x)
+                {
+                    swap_cells(i, j);
+                }
+
+                if((*base)->x < (*i)->x)
+                {
+                    swap_cells(base, i);
+                }
+
+                if((*j)->x < (*base)->x)
+                {
+                    swap_cells(base, j);
+                }
+
+                for(;;)
+                {
+                    int x = (*base)->x;
+                    do i++; while( (*i)->x < x );
+                    do j--; while( x < (*j)->x );
+
+                    if(i > j)
+                    {
+                        break;
+                    }
+
+                    swap_cells(i, j);
+                }
+
+                swap_cells(base, j);
+
+                // now, push the largest sub-array
+                if(j - base > limit - i)
+                {
+                    top[0] = base;
+                    top[1] = j;
+                    base   = i;
+                }
+                else
+                {
+                    top[0] = i;
+                    top[1] = limit;
+                    limit  = j;
+                }
+                top += 2;
+            }
+            else
+            {
+                // the sub-array is small, perform insertion sort
+                j = base;
+                i = j + 1;
+
+                for(; i < limit; j = i, i++)
+                {
+                    for(; j[1]->x < (*j)->x; j--)
+                    {
+                        swap_cells(j + 1, j);
+                        if (j == base)
+                        {
+                            break;
+                        }
+                    }
+                }
+
+                if(top > stack)
+                {
+                    top  -= 2;
+                    base  = top[0];
+                    limit = top[1];
+                }
+                else
+                {
+                    break;
+                }
+            }
+        }
+    }
+
+
+    //------------------------------------------------------------------------
+    template<class Cell> 
+    void rasterizer_cells_aa<Cell>::sort_cells()
+    {
+        if(m_sorted) return; //Perform sort only the first time.
+
+        add_curr_cell();
+        m_curr_cell.x     = 0x7FFFFFFF;
+        m_curr_cell.y     = 0x7FFFFFFF;
+        m_curr_cell.cover = 0;
+        m_curr_cell.area  = 0;
+
+        if(m_num_cells == 0) return;
+
+// DBG: Check to see if min/max works well.
+//for(unsigned nc = 0; nc < m_num_cells; nc++)
+//{
+//    cell_type* cell = m_cells[nc >> cell_block_shift] + (nc & cell_block_mask);
+//    if(cell->x < m_min_x || 
+//       cell->y < m_min_y || 
+//       cell->x > m_max_x || 
+//       cell->y > m_max_y)
+//    {
+//        cell = cell; // Breakpoint here
+//    }
+//}
+        // Allocate the array of cell pointers
+        m_sorted_cells.allocate(m_num_cells, 16);
+
+        // Allocate and zero the Y array
+        m_sorted_y.allocate(m_max_y - m_min_y + 1, 16);
+        m_sorted_y.zero();
+
+        // Create the Y-histogram (count the numbers of cells for each Y)
+        cell_type** block_ptr = m_cells;
+        cell_type*  cell_ptr;
+        unsigned nb = m_num_cells;
+        unsigned i;
+        while(nb)
+        {
+            cell_ptr = *block_ptr++;
+            i = (nb > cell_block_size) ? cell_block_size : nb;
+            nb -= i;
+            while(i--) 
+            {
+                m_sorted_y[cell_ptr->y - m_min_y].start++;
+                ++cell_ptr;
+            }
+        }
+
+        // Convert the Y-histogram into the array of starting indexes
+        unsigned start = 0;
+        for(i = 0; i < m_sorted_y.size(); i++)
+        {
+            unsigned v = m_sorted_y[i].start;
+            m_sorted_y[i].start = start;
+            start += v;
+        }
+
+        // Fill the cell pointer array sorted by Y
+        block_ptr = m_cells;
+        nb = m_num_cells;
+        while(nb)
+        {
+            cell_ptr = *block_ptr++;
+            i = (nb > cell_block_size) ? cell_block_size : nb;
+            nb -= i;
+            while(i--)
+            {
+                sorted_y& curr_y = m_sorted_y[cell_ptr->y - m_min_y];
+                m_sorted_cells[curr_y.start + curr_y.num] = cell_ptr;
+                ++curr_y.num;
+                ++cell_ptr;
+            }
+        }
+        
+        // Finally arrange the X-arrays
+        for(i = 0; i < m_sorted_y.size(); i++)
+        {
+            const sorted_y& curr_y = m_sorted_y[i];
+            if(curr_y.num)
+            {
+                qsort_cells(m_sorted_cells.data() + curr_y.start, curr_y.num);
+            }
+        }
+        m_sorted = true;
+    }
+
+
+
+    //------------------------------------------------------scanline_hit_test
+    class scanline_hit_test
+    {
+    public:
+        scanline_hit_test(int x) : m_x(x), m_hit(false) {}
+
+        void reset_spans() {}
+        void finalize(int) {}
+        void add_cell(int x, int)
+        {
+            if(m_x == x) m_hit = true;
+        }
+        void add_span(int x, int len, int)
+        {
+            if(m_x >= x && m_x < x+len) m_hit = true;
+        }
+        unsigned num_spans() const { return 1; }
+        bool hit() const { return m_hit; }
+
+    private:
+        int  m_x;
+        bool m_hit;
+    };
+
+
+}
+
+#endif

3rd/agg/include/agg_rasterizer_scanline_aa.h

@@ -0,0 +1,481 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+//
+// The author gratefully acknowleges the support of David Turner, 
+// Robert Wilhelm, and Werner Lemberg - the authors of the FreeType 
+// libray - in producing this work. See http://www.freetype.org for details.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// Adaptation for 32-bit screen coordinates has been sponsored by 
+// Liberty Technology Systems, Inc., visit http://lib-sys.com
+//
+// Liberty Technology Systems, Inc. is the provider of
+// PostScript and PDF technology for software developers.
+// 
+//----------------------------------------------------------------------------
+#ifndef AGG_RASTERIZER_SCANLINE_AA_INCLUDED
+#define AGG_RASTERIZER_SCANLINE_AA_INCLUDED
+
+#include "agg_rasterizer_cells_aa.h"
+#include "agg_rasterizer_sl_clip.h"
+#include "agg_rasterizer_scanline_aa_nogamma.h"
+#include "agg_gamma_functions.h"
+
+
+namespace agg
+{
+    //==================================================rasterizer_scanline_aa
+    // Polygon rasterizer that is used to render filled polygons with 
+    // high-quality Anti-Aliasing. Internally, by default, the class uses 
+    // integer coordinates in format 24.8, i.e. 24 bits for integer part 
+    // and 8 bits for fractional - see poly_subpixel_shift. This class can be 
+    // used in the following  way:
+    //
+    // 1. filling_rule(filling_rule_e ft) - optional.
+    //
+    // 2. gamma() - optional.
+    //
+    // 3. reset()
+    //
+    // 4. move_to(x, y) / line_to(x, y) - make the polygon. One can create 
+    //    more than one contour, but each contour must consist of at least 3
+    //    vertices, i.e. move_to(x1, y1); line_to(x2, y2); line_to(x3, y3);
+    //    is the absolute minimum of vertices that define a triangle.
+    //    The algorithm does not check either the number of vertices nor
+    //    coincidence of their coordinates, but in the worst case it just 
+    //    won't draw anything.
+    //    The orger of the vertices (clockwise or counterclockwise) 
+    //    is important when using the non-zero filling rule (fill_non_zero).
+    //    In this case the vertex order of all the contours must be the same
+    //    if you want your intersecting polygons to be without "holes".
+    //    You actually can use different vertices order. If the contours do not 
+    //    intersect each other the order is not important anyway. If they do, 
+    //    contours with the same vertex order will be rendered without "holes" 
+    //    while the intersecting contours with different orders will have "holes".
+    //
+    // filling_rule() and gamma() can be called anytime before "sweeping".
+    //------------------------------------------------------------------------
+    template<class Clip=rasterizer_sl_clip_int> class rasterizer_scanline_aa
+    {
+        enum status
+        {
+            status_initial,
+            status_move_to,
+            status_line_to,
+            status_closed
+        };
+
+    public:
+        typedef Clip                      clip_type;
+        typedef typename Clip::conv_type  conv_type;
+        typedef typename Clip::coord_type coord_type;
+
+        enum aa_scale_e
+        {
+            aa_shift  = 8,
+            aa_scale  = 1 << aa_shift,
+            aa_mask   = aa_scale - 1,
+            aa_scale2 = aa_scale * 2,
+            aa_mask2  = aa_scale2 - 1
+        };
+
+        //--------------------------------------------------------------------
+        rasterizer_scanline_aa() : 
+            m_outline(),
+            m_clipper(),
+            m_filling_rule(fill_non_zero),
+            m_auto_close(true),
+            m_start_x(0),
+            m_start_y(0),
+            m_status(status_initial)
+        {
+            int i;
+            for(i = 0; i < aa_scale; i++) m_gamma[i] = i;
+        }
+
+        //--------------------------------------------------------------------
+        template<class GammaF> 
+        rasterizer_scanline_aa(const GammaF& gamma_function) : 
+            m_outline(),
+            m_clipper(m_outline),
+            m_filling_rule(fill_non_zero),
+            m_auto_close(true),
+            m_start_x(0),
+            m_start_y(0),
+            m_status(status_initial)
+        {
+            gamma(gamma_function);
+        }
+
+        //--------------------------------------------------------------------
+        void reset(); 
+        void reset_clipping();
+        void clip_box(double x1, double y1, double x2, double y2);
+        void filling_rule(filling_rule_e filling_rule);
+        void auto_close(bool flag) { m_auto_close = flag; }
+
+        //--------------------------------------------------------------------
+        template<class GammaF> void gamma(const GammaF& gamma_function)
+        { 
+            int i;
+            for(i = 0; i < aa_scale; i++)
+            {
+                m_gamma[i] = uround(gamma_function(double(i) / aa_mask) * aa_mask);
+            }
+        }
+
+        //--------------------------------------------------------------------
+        unsigned apply_gamma(unsigned cover) const 
+        { 
+            return m_gamma[cover]; 
+        }
+
+        //--------------------------------------------------------------------
+        void move_to(int x, int y);
+        void line_to(int x, int y);
+        void move_to_d(double x, double y);
+        void line_to_d(double x, double y);
+        void close_polygon();
+        void add_vertex(double x, double y, unsigned cmd);
+
+        void edge(int x1, int y1, int x2, int y2);
+        void edge_d(double x1, double y1, double x2, double y2);
+
+        //-------------------------------------------------------------------
+        template<class VertexSource>
+        void add_path(VertexSource& vs, unsigned path_id=0)
+        {
+            double x;
+            double y;
+
+            unsigned cmd;
+            vs.rewind(path_id);
+            if(m_outline.sorted()) reset();
+            while(!is_stop(cmd = vs.vertex(&x, &y)))
+            {
+                add_vertex(x, y, cmd);
+            }
+        }
+        
+        //--------------------------------------------------------------------
+        int min_x() const { return m_outline.min_x(); }
+        int min_y() const { return m_outline.min_y(); }
+        int max_x() const { return m_outline.max_x(); }
+        int max_y() const { return m_outline.max_y(); }
+
+        //--------------------------------------------------------------------
+        void sort();
+        bool rewind_scanlines();
+        bool navigate_scanline(int y);
+
+        //--------------------------------------------------------------------
+        AGG_INLINE unsigned calculate_alpha(int area) const
+        {
+            int cover = area >> (poly_subpixel_shift*2 + 1 - aa_shift);
+
+            if(cover < 0) cover = -cover;
+            if(m_filling_rule == fill_even_odd)
+            {
+                cover &= aa_mask2;
+                if(cover > aa_scale)
+                {
+                    cover = aa_scale2 - cover;
+                }
+            }
+            if(cover > aa_mask) cover = aa_mask;
+            return m_gamma[cover];
+        }
+
+        //--------------------------------------------------------------------
+        template<class Scanline> bool sweep_scanline(Scanline& sl)
+        {
+            for(;;)
+            {
+                if(m_scan_y > m_outline.max_y()) return false;
+                sl.reset_spans();
+                unsigned num_cells = m_outline.scanline_num_cells(m_scan_y);
+                const cell_aa* const* cells = m_outline.scanline_cells(m_scan_y);
+                int cover = 0;
+
+                while(num_cells)
+                {
+                    const cell_aa* cur_cell = *cells;
+                    int x    = cur_cell->x;
+                    int area = cur_cell->area;
+                    unsigned alpha;
+
+                    cover += cur_cell->cover;
+
+                    //accumulate all cells with the same X
+                    while(--num_cells)
+                    {
+                        cur_cell = *++cells;
+                        if(cur_cell->x != x) break;
+                        area  += cur_cell->area;
+                        cover += cur_cell->cover;
+                    }
+
+                    if(area)
+                    {
+                        alpha = calculate_alpha((cover << (poly_subpixel_shift + 1)) - area);
+                        if(alpha)
+                        {
+                            sl.add_cell(x, alpha);
+                        }
+                        x++;
+                    }
+
+                    if(num_cells && cur_cell->x > x)
+                    {
+                        alpha = calculate_alpha(cover << (poly_subpixel_shift + 1));
+                        if(alpha)
+                        {
+                            sl.add_span(x, cur_cell->x - x, alpha);
+                        }
+                    }
+                }
+        
+                if(sl.num_spans()) break;
+                ++m_scan_y;
+            }
+
+            sl.finalize(m_scan_y);
+            ++m_scan_y;
+            return true;
+        }
+
+        //--------------------------------------------------------------------
+        bool hit_test(int tx, int ty);
+
+
+    private:
+        //--------------------------------------------------------------------
+        // Disable copying
+        rasterizer_scanline_aa(const rasterizer_scanline_aa<Clip>&);
+        const rasterizer_scanline_aa<Clip>& 
+        operator = (const rasterizer_scanline_aa<Clip>&);
+
+    private:
+        rasterizer_cells_aa<cell_aa> m_outline;
+        clip_type      m_clipper;
+        int            m_gamma[aa_scale];
+        filling_rule_e m_filling_rule;
+        bool           m_auto_close;
+        coord_type     m_start_x;
+        coord_type     m_start_y;
+        unsigned       m_status;
+        int            m_scan_y;
+    };
+
+
+
+
+
+
+
+
+
+
+
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa<Clip>::reset() 
+    { 
+        m_outline.reset(); 
+        m_status = status_initial;
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa<Clip>::filling_rule(filling_rule_e filling_rule) 
+    { 
+        m_filling_rule = filling_rule; 
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa<Clip>::clip_box(double x1, double y1, 
+                                                double x2, double y2)
+    {
+        reset();
+        m_clipper.clip_box(conv_type::upscale(x1), conv_type::upscale(y1), 
+                           conv_type::upscale(x2), conv_type::upscale(y2));
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa<Clip>::reset_clipping()
+    {
+        reset();
+        m_clipper.reset_clipping();
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa<Clip>::close_polygon()
+    {
+        if(m_status == status_line_to)
+        {
+            m_clipper.line_to(m_outline, m_start_x, m_start_y);
+            m_status = status_closed;
+        }
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa<Clip>::move_to(int x, int y)
+    {
+        if(m_outline.sorted()) reset();
+        if(m_auto_close) close_polygon();
+        m_clipper.move_to(m_start_x = conv_type::downscale(x), 
+                          m_start_y = conv_type::downscale(y));
+        m_status = status_move_to;
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa<Clip>::line_to(int x, int y)
+    {
+        m_clipper.line_to(m_outline, 
+                          conv_type::downscale(x), 
+                          conv_type::downscale(y));
+        m_status = status_line_to;
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa<Clip>::move_to_d(double x, double y) 
+    { 
+        if(m_outline.sorted()) reset();
+        if(m_auto_close) close_polygon();
+        m_clipper.move_to(m_start_x = conv_type::upscale(x), 
+                          m_start_y = conv_type::upscale(y)); 
+        m_status = status_move_to;
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa<Clip>::line_to_d(double x, double y) 
+    { 
+        m_clipper.line_to(m_outline, 
+                          conv_type::upscale(x), 
+                          conv_type::upscale(y)); 
+        m_status = status_line_to;
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa<Clip>::add_vertex(double x, double y, unsigned cmd)
+    {
+        if(is_move_to(cmd)) 
+        {
+            move_to_d(x, y);
+        }
+        else 
+        if(is_vertex(cmd))
+        {
+            line_to_d(x, y);
+        }
+        else
+        if(is_close(cmd))
+        {
+            close_polygon();
+        }
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa<Clip>::edge(int x1, int y1, int x2, int y2)
+    {
+        if(m_outline.sorted()) reset();
+        m_clipper.move_to(conv_type::downscale(x1), conv_type::downscale(y1));
+        m_clipper.line_to(m_outline, 
+                          conv_type::downscale(x2), 
+                          conv_type::downscale(y2));
+        m_status = status_move_to;
+    }
+    
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa<Clip>::edge_d(double x1, double y1, 
+                                              double x2, double y2)
+    {
+        if(m_outline.sorted()) reset();
+        m_clipper.move_to(conv_type::upscale(x1), conv_type::upscale(y1)); 
+        m_clipper.line_to(m_outline, 
+                          conv_type::upscale(x2), 
+                          conv_type::upscale(y2)); 
+        m_status = status_move_to;
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa<Clip>::sort()
+    {
+        if(m_auto_close) close_polygon();
+        m_outline.sort_cells();
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    AGG_INLINE bool rasterizer_scanline_aa<Clip>::rewind_scanlines()
+    {
+        if(m_auto_close) close_polygon();
+        m_outline.sort_cells();
+        if(m_outline.total_cells() == 0) 
+        {
+            return false;
+        }
+        m_scan_y = m_outline.min_y();
+        return true;
+    }
+
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    AGG_INLINE bool rasterizer_scanline_aa<Clip>::navigate_scanline(int y)
+    {
+        if(m_auto_close) close_polygon();
+        m_outline.sort_cells();
+        if(m_outline.total_cells() == 0 || 
+           y < m_outline.min_y() || 
+           y > m_outline.max_y()) 
+        {
+            return false;
+        }
+        m_scan_y = y;
+        return true;
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    bool rasterizer_scanline_aa<Clip>::hit_test(int tx, int ty)
+    {
+        if(!navigate_scanline(ty)) return false;
+        scanline_hit_test sl(tx);
+        sweep_scanline(sl);
+        return sl.hit();
+    }
+
+
+
+}
+
+
+
+#endif
+

3rd/agg/include/agg_rasterizer_scanline_aa_nogamma.h

@@ -0,0 +1,482 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+//
+// The author gratefully acknowleges the support of David Turner, 
+// Robert Wilhelm, and Werner Lemberg - the authors of the FreeType 
+// libray - in producing this work. See http://www.freetype.org for details.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// Adaptation for 32-bit screen coordinates has been sponsored by 
+// Liberty Technology Systems, Inc., visit http://lib-sys.com
+//
+// Liberty Technology Systems, Inc. is the provider of
+// PostScript and PDF technology for software developers.
+// 
+//----------------------------------------------------------------------------
+#ifndef AGG_RASTERIZER_SCANLINE_AA_NOGAMMA_INCLUDED
+#define AGG_RASTERIZER_SCANLINE_AA_NOGAMMA_INCLUDED
+
+#include "agg_rasterizer_cells_aa.h"
+#include "agg_rasterizer_sl_clip.h"
+
+
+namespace agg
+{
+
+
+    //-----------------------------------------------------------------cell_aa
+    // A pixel cell. There're no constructors defined and it was done 
+    // intentionally in order to avoid extra overhead when allocating an 
+    // array of cells.
+    struct cell_aa
+    {
+        int x;
+        int y;
+        int cover;
+        int area;
+
+        void initial()
+        {
+            x = 0x7FFFFFFF;
+            y = 0x7FFFFFFF;
+            cover = 0;
+            area  = 0;
+        }
+
+        void style(const cell_aa&) {}
+
+        int not_equal(int ex, int ey, const cell_aa&) const
+        {
+            return (ex - x) | (ey - y);
+        }
+    };
+
+
+    //==================================================rasterizer_scanline_aa_nogamma
+    // Polygon rasterizer that is used to render filled polygons with 
+    // high-quality Anti-Aliasing. Internally, by default, the class uses 
+    // integer coordinates in format 24.8, i.e. 24 bits for integer part 
+    // and 8 bits for fractional - see poly_subpixel_shift. This class can be 
+    // used in the following  way:
+    //
+    // 1. filling_rule(filling_rule_e ft) - optional.
+    //
+    // 2. gamma() - optional.
+    //
+    // 3. reset()
+    //
+    // 4. move_to(x, y) / line_to(x, y) - make the polygon. One can create 
+    //    more than one contour, but each contour must consist of at least 3
+    //    vertices, i.e. move_to(x1, y1); line_to(x2, y2); line_to(x3, y3);
+    //    is the absolute minimum of vertices that define a triangle.
+    //    The algorithm does not check either the number of vertices nor
+    //    coincidence of their coordinates, but in the worst case it just 
+    //    won't draw anything.
+    //    The orger of the vertices (clockwise or counterclockwise) 
+    //    is important when using the non-zero filling rule (fill_non_zero).
+    //    In this case the vertex order of all the contours must be the same
+    //    if you want your intersecting polygons to be without "holes".
+    //    You actually can use different vertices order. If the contours do not 
+    //    intersect each other the order is not important anyway. If they do, 
+    //    contours with the same vertex order will be rendered without "holes" 
+    //    while the intersecting contours with different orders will have "holes".
+    //
+    // filling_rule() and gamma() can be called anytime before "sweeping".
+    //------------------------------------------------------------------------
+    template<class Clip=rasterizer_sl_clip_int> class rasterizer_scanline_aa_nogamma
+    {
+        enum status
+        {
+            status_initial,
+            status_move_to,
+            status_line_to,
+            status_closed
+        };
+
+    public:
+        typedef Clip                      clip_type;
+        typedef typename Clip::conv_type  conv_type;
+        typedef typename Clip::coord_type coord_type;
+
+        enum aa_scale_e
+        {
+            aa_shift  = 8,
+            aa_scale  = 1 << aa_shift,
+            aa_mask   = aa_scale - 1,
+            aa_scale2 = aa_scale * 2,
+            aa_mask2  = aa_scale2 - 1
+        };
+
+        //--------------------------------------------------------------------
+        rasterizer_scanline_aa_nogamma() : 
+            m_outline(),
+            m_clipper(),
+            m_filling_rule(fill_non_zero),
+            m_auto_close(true),
+            m_start_x(0),
+            m_start_y(0),
+            m_status(status_initial)
+        {
+        }
+
+        //--------------------------------------------------------------------
+        void reset(); 
+        void reset_clipping();
+        void clip_box(double x1, double y1, double x2, double y2);
+        void filling_rule(filling_rule_e filling_rule);
+        void auto_close(bool flag) { m_auto_close = flag; }
+
+        //--------------------------------------------------------------------
+        unsigned apply_gamma(unsigned cover) const 
+        { 
+            return cover;
+        }
+
+        //--------------------------------------------------------------------
+        void move_to(int x, int y);
+        void line_to(int x, int y);
+        void move_to_d(double x, double y);
+        void line_to_d(double x, double y);
+        void close_polygon();
+        void add_vertex(double x, double y, unsigned cmd);
+
+        void edge(int x1, int y1, int x2, int y2);
+        void edge_d(double x1, double y1, double x2, double y2);
+
+        //-------------------------------------------------------------------
+        template<class VertexSource>
+        void add_path(VertexSource& vs, unsigned path_id=0)
+        {
+            double x;
+            double y;
+
+            unsigned cmd;
+            vs.rewind(path_id);
+            if(m_outline.sorted()) reset();
+            while(!is_stop(cmd = vs.vertex(&x, &y)))
+            {
+                add_vertex(x, y, cmd);
+            }
+        }
+        
+        //--------------------------------------------------------------------
+        int min_x() const { return m_outline.min_x(); }
+        int min_y() const { return m_outline.min_y(); }
+        int max_x() const { return m_outline.max_x(); }
+        int max_y() const { return m_outline.max_y(); }
+
+        //--------------------------------------------------------------------
+        void sort();
+        bool rewind_scanlines();
+        bool navigate_scanline(int y);
+
+        //--------------------------------------------------------------------
+        AGG_INLINE unsigned calculate_alpha(int area) const
+        {
+            int cover = area >> (poly_subpixel_shift*2 + 1 - aa_shift);
+
+            if(cover < 0) cover = -cover;
+            if(m_filling_rule == fill_even_odd)
+            {
+                cover &= aa_mask2;
+                if(cover > aa_scale)
+                {
+                    cover = aa_scale2 - cover;
+                }
+            }
+            if(cover > aa_mask) cover = aa_mask;
+            return cover;
+        }
+
+        //--------------------------------------------------------------------
+        template<class Scanline> bool sweep_scanline(Scanline& sl)
+        {
+            for(;;)
+            {
+                if(m_scan_y > m_outline.max_y()) return false;
+                sl.reset_spans();
+                unsigned num_cells = m_outline.scanline_num_cells(m_scan_y);
+                const cell_aa* const* cells = m_outline.scanline_cells(m_scan_y);
+                int cover = 0;
+
+                while(num_cells)
+                {
+                    const cell_aa* cur_cell = *cells;
+                    int x    = cur_cell->x;
+                    int area = cur_cell->area;
+                    unsigned alpha;
+
+                    cover += cur_cell->cover;
+
+                    //accumulate all cells with the same X
+                    while(--num_cells)
+                    {
+                        cur_cell = *++cells;
+                        if(cur_cell->x != x) break;
+                        area  += cur_cell->area;
+                        cover += cur_cell->cover;
+                    }
+
+                    if(area)
+                    {
+                        alpha = calculate_alpha((cover << (poly_subpixel_shift + 1)) - area);
+                        if(alpha)
+                        {
+                            sl.add_cell(x, alpha);
+                        }
+                        x++;
+                    }
+
+                    if(num_cells && cur_cell->x > x)
+                    {
+                        alpha = calculate_alpha(cover << (poly_subpixel_shift + 1));
+                        if(alpha)
+                        {
+                            sl.add_span(x, cur_cell->x - x, alpha);
+                        }
+                    }
+                }
+        
+                if(sl.num_spans()) break;
+                ++m_scan_y;
+            }
+
+            sl.finalize(m_scan_y);
+            ++m_scan_y;
+            return true;
+        }
+
+        //--------------------------------------------------------------------
+        bool hit_test(int tx, int ty);
+
+
+    private:
+        //--------------------------------------------------------------------
+        // Disable copying
+        rasterizer_scanline_aa_nogamma(const rasterizer_scanline_aa_nogamma<Clip>&);
+        const rasterizer_scanline_aa_nogamma<Clip>& 
+        operator = (const rasterizer_scanline_aa_nogamma<Clip>&);
+
+    private:
+        rasterizer_cells_aa<cell_aa> m_outline;
+        clip_type      m_clipper;
+        filling_rule_e m_filling_rule;
+        bool           m_auto_close;
+        coord_type     m_start_x;
+        coord_type     m_start_y;
+        unsigned       m_status;
+        int            m_scan_y;
+    };
+
+
+
+
+
+
+
+
+
+
+
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa_nogamma<Clip>::reset() 
+    { 
+        m_outline.reset(); 
+        m_status = status_initial;
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa_nogamma<Clip>::filling_rule(filling_rule_e filling_rule) 
+    { 
+        m_filling_rule = filling_rule; 
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa_nogamma<Clip>::clip_box(double x1, double y1, 
+                                                double x2, double y2)
+    {
+        reset();
+        m_clipper.clip_box(conv_type::upscale(x1), conv_type::upscale(y1), 
+                           conv_type::upscale(x2), conv_type::upscale(y2));
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa_nogamma<Clip>::reset_clipping()
+    {
+        reset();
+        m_clipper.reset_clipping();
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa_nogamma<Clip>::close_polygon()
+    {
+        if(m_status == status_line_to)
+        {
+            m_clipper.line_to(m_outline, m_start_x, m_start_y);
+            m_status = status_closed;
+        }
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa_nogamma<Clip>::move_to(int x, int y)
+    {
+        if(m_outline.sorted()) reset();
+        if(m_auto_close) close_polygon();
+        m_clipper.move_to(m_start_x = conv_type::downscale(x), 
+                          m_start_y = conv_type::downscale(y));
+        m_status = status_move_to;
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa_nogamma<Clip>::line_to(int x, int y)
+    {
+        m_clipper.line_to(m_outline, 
+                          conv_type::downscale(x), 
+                          conv_type::downscale(y));
+        m_status = status_line_to;
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa_nogamma<Clip>::move_to_d(double x, double y) 
+    { 
+        if(m_outline.sorted()) reset();
+        if(m_auto_close) close_polygon();
+        m_clipper.move_to(m_start_x = conv_type::upscale(x), 
+                          m_start_y = conv_type::upscale(y)); 
+        m_status = status_move_to;
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa_nogamma<Clip>::line_to_d(double x, double y) 
+    { 
+        m_clipper.line_to(m_outline, 
+                          conv_type::upscale(x), 
+                          conv_type::upscale(y)); 
+        m_status = status_line_to;
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa_nogamma<Clip>::add_vertex(double x, double y, unsigned cmd)
+    {
+        if(is_move_to(cmd)) 
+        {
+            move_to_d(x, y);
+        }
+        else 
+        if(is_vertex(cmd))
+        {
+            line_to_d(x, y);
+        }
+        else
+        if(is_close(cmd))
+        {
+            close_polygon();
+        }
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa_nogamma<Clip>::edge(int x1, int y1, int x2, int y2)
+    {
+        if(m_outline.sorted()) reset();
+        m_clipper.move_to(conv_type::downscale(x1), conv_type::downscale(y1));
+        m_clipper.line_to(m_outline, 
+                          conv_type::downscale(x2), 
+                          conv_type::downscale(y2));
+        m_status = status_move_to;
+    }
+    
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa_nogamma<Clip>::edge_d(double x1, double y1, 
+                                              double x2, double y2)
+    {
+        if(m_outline.sorted()) reset();
+        m_clipper.move_to(conv_type::upscale(x1), conv_type::upscale(y1)); 
+        m_clipper.line_to(m_outline, 
+                          conv_type::upscale(x2), 
+                          conv_type::upscale(y2)); 
+        m_status = status_move_to;
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    void rasterizer_scanline_aa_nogamma<Clip>::sort()
+    {
+        if(m_auto_close) close_polygon();
+        m_outline.sort_cells();
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    AGG_INLINE bool rasterizer_scanline_aa_nogamma<Clip>::rewind_scanlines()
+    {
+        if(m_auto_close) close_polygon();
+        m_outline.sort_cells();
+        if(m_outline.total_cells() == 0) 
+        {
+            return false;
+        }
+        m_scan_y = m_outline.min_y();
+        return true;
+    }
+
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    AGG_INLINE bool rasterizer_scanline_aa_nogamma<Clip>::navigate_scanline(int y)
+    {
+        if(m_auto_close) close_polygon();
+        m_outline.sort_cells();
+        if(m_outline.total_cells() == 0 || 
+           y < m_outline.min_y() || 
+           y > m_outline.max_y()) 
+        {
+            return false;
+        }
+        m_scan_y = y;
+        return true;
+    }
+
+    //------------------------------------------------------------------------
+    template<class Clip> 
+    bool rasterizer_scanline_aa_nogamma<Clip>::hit_test(int tx, int ty)
+    {
+        if(!navigate_scanline(ty)) return false;
+        scanline_hit_test sl(tx);
+        sweep_scanline(sl);
+        return sl.hit();
+    }
+
+
+
+}
+
+
+
+#endif
+

3rd/agg/include/agg_rasterizer_sl_clip.h

@@ -0,0 +1,351 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+#ifndef AGG_RASTERIZER_SL_CLIP_INCLUDED
+#define AGG_RASTERIZER_SL_CLIP_INCLUDED
+
+#include "agg_clip_liang_barsky.h"
+
+namespace agg
+{
+    //--------------------------------------------------------poly_max_coord_e
+    enum poly_max_coord_e
+    {
+        poly_max_coord = (1 << 30) - 1 //----poly_max_coord
+    };
+    
+    //------------------------------------------------------------ras_conv_int
+    struct ras_conv_int
+    {
+        typedef int coord_type;
+        static AGG_INLINE int mul_div(double a, double b, double c)
+        {
+            return iround(a * b / c);
+        }
+        static int xi(int v) { return v; }
+        static int yi(int v) { return v; }
+        static int upscale(double v) { return iround(v * poly_subpixel_scale); }
+        static int downscale(int v)  { return v; }
+    };
+
+    //--------------------------------------------------------ras_conv_int_sat
+    struct ras_conv_int_sat
+    {
+        typedef int coord_type;
+        static AGG_INLINE int mul_div(double a, double b, double c)
+        {
+            return saturation<poly_max_coord>::iround(a * b / c);
+        }
+        static int xi(int v) { return v; }
+        static int yi(int v) { return v; }
+        static int upscale(double v) 
+        { 
+            return saturation<poly_max_coord>::iround(v * poly_subpixel_scale); 
+        }
+        static int downscale(int v) { return v; }
+    };
+
+    //---------------------------------------------------------ras_conv_int_3x
+    struct ras_conv_int_3x
+    {
+        typedef int coord_type;
+        static AGG_INLINE int mul_div(double a, double b, double c)
+        {
+            return iround(a * b / c);
+        }
+        static int xi(int v) { return v * 3; }
+        static int yi(int v) { return v; }
+        static int upscale(double v) { return iround(v * poly_subpixel_scale); }
+        static int downscale(int v)  { return v; }
+    };
+
+    //-----------------------------------------------------------ras_conv_dbl
+    struct ras_conv_dbl
+    {
+        typedef double coord_type;
+        static AGG_INLINE double mul_div(double a, double b, double c)
+        {
+            return a * b / c;
+        }
+        static int xi(double v) { return iround(v * poly_subpixel_scale); }
+        static int yi(double v) { return iround(v * poly_subpixel_scale); }
+        static double upscale(double v) { return v; }
+        static double downscale(int v)  { return v / double(poly_subpixel_scale); }
+    };
+
+    //--------------------------------------------------------ras_conv_dbl_3x
+    struct ras_conv_dbl_3x
+    {
+        typedef double coord_type;
+        static AGG_INLINE double mul_div(double a, double b, double c)
+        {
+            return a * b / c;
+        }
+        static int xi(double v) { return iround(v * poly_subpixel_scale * 3); }
+        static int yi(double v) { return iround(v * poly_subpixel_scale); }
+        static double upscale(double v) { return v; }
+        static double downscale(int v)  { return v / double(poly_subpixel_scale); }
+    };
+
+
+
+
+
+    //------------------------------------------------------rasterizer_sl_clip
+    template<class Conv> class rasterizer_sl_clip
+    {
+    public:
+        typedef Conv                      conv_type;
+        typedef typename Conv::coord_type coord_type;
+        typedef rect_base<coord_type>     rect_type;
+
+        //--------------------------------------------------------------------
+        rasterizer_sl_clip() :  
+            m_clip_box(0,0,0,0),
+            m_x1(0),
+            m_y1(0),
+            m_f1(0),
+            m_clipping(false) 
+        {}
+
+        //--------------------------------------------------------------------
+        void reset_clipping()
+        {
+            m_clipping = false;
+        }
+
+        //--------------------------------------------------------------------
+        void clip_box(coord_type x1, coord_type y1, coord_type x2, coord_type y2)
+        {
+            m_clip_box = rect_type(x1, y1, x2, y2);
+            m_clip_box.normalize();
+            m_clipping = true;
+        }
+
+        //--------------------------------------------------------------------
+        void move_to(coord_type x1, coord_type y1)
+        {
+            m_x1 = x1;
+            m_y1 = y1;
+            if(m_clipping) m_f1 = clipping_flags(x1, y1, m_clip_box);
+        }
+
+    private:
+        //------------------------------------------------------------------------
+        template<class Rasterizer>
+        AGG_INLINE void line_clip_y(Rasterizer& ras,
+                                    coord_type x1, coord_type y1, 
+                                    coord_type x2, coord_type y2, 
+                                    unsigned   f1, unsigned   f2) const
+        {
+            f1 &= 10;
+            f2 &= 10;
+            if((f1 | f2) == 0)
+            {
+                // Fully visible
+                ras.line(Conv::xi(x1), Conv::yi(y1), Conv::xi(x2), Conv::yi(y2)); 
+            }
+            else
+            {
+                if(f1 == f2)
+                {
+                    // Invisible by Y
+                    return;
+                }
+
+                coord_type tx1 = x1;
+                coord_type ty1 = y1;
+                coord_type tx2 = x2;
+                coord_type ty2 = y2;
+
+                if(f1 & 8) // y1 < clip.y1
+                {
+                    tx1 = x1 + Conv::mul_div(m_clip_box.y1-y1, x2-x1, y2-y1);
+                    ty1 = m_clip_box.y1;
+                }
+
+                if(f1 & 2) // y1 > clip.y2
+                {
+                    tx1 = x1 + Conv::mul_div(m_clip_box.y2-y1, x2-x1, y2-y1);
+                    ty1 = m_clip_box.y2;
+                }
+
+                if(f2 & 8) // y2 < clip.y1
+                {
+                    tx2 = x1 + Conv::mul_div(m_clip_box.y1-y1, x2-x1, y2-y1);
+                    ty2 = m_clip_box.y1;
+                }
+
+                if(f2 & 2) // y2 > clip.y2
+                {
+                    tx2 = x1 + Conv::mul_div(m_clip_box.y2-y1, x2-x1, y2-y1);
+                    ty2 = m_clip_box.y2;
+                }
+                ras.line(Conv::xi(tx1), Conv::yi(ty1), 
+                         Conv::xi(tx2), Conv::yi(ty2)); 
+            }
+        }
+
+
+    public:
+        //--------------------------------------------------------------------
+        template<class Rasterizer>
+        void line_to(Rasterizer& ras, coord_type x2, coord_type y2)
+        {
+            if(m_clipping)
+            {
+                unsigned f2 = clipping_flags(x2, y2, m_clip_box);
+
+                if((m_f1 & 10) == (f2 & 10) && (m_f1 & 10) != 0)
+                {
+                    // Invisible by Y
+                    m_x1 = x2;
+                    m_y1 = y2;
+                    m_f1 = f2;
+                    return;
+                }
+
+                coord_type x1 = m_x1;
+                coord_type y1 = m_y1;
+                unsigned   f1 = m_f1;
+                coord_type y3, y4;
+                unsigned   f3, f4;
+
+                switch(((f1 & 5) << 1) | (f2 & 5))
+                {
+                case 0: // Visible by X
+                    line_clip_y(ras, x1, y1, x2, y2, f1, f2);
+                    break;
+
+                case 1: // x2 > clip.x2
+                    y3 = y1 + Conv::mul_div(m_clip_box.x2-x1, y2-y1, x2-x1);
+                    f3 = clipping_flags_y(y3, m_clip_box);
+                    line_clip_y(ras, x1, y1, m_clip_box.x2, y3, f1, f3);
+                    line_clip_y(ras, m_clip_box.x2, y3, m_clip_box.x2, y2, f3, f2);
+                    break;
+
+                case 2: // x1 > clip.x2
+                    y3 = y1 + Conv::mul_div(m_clip_box.x2-x1, y2-y1, x2-x1);
+                    f3 = clipping_flags_y(y3, m_clip_box);
+                    line_clip_y(ras, m_clip_box.x2, y1, m_clip_box.x2, y3, f1, f3);
+                    line_clip_y(ras, m_clip_box.x2, y3, x2, y2, f3, f2);
+                    break;
+
+                case 3: // x1 > clip.x2 && x2 > clip.x2
+                    line_clip_y(ras, m_clip_box.x2, y1, m_clip_box.x2, y2, f1, f2);
+                    break;
+
+                case 4: // x2 < clip.x1
+                    y3 = y1 + Conv::mul_div(m_clip_box.x1-x1, y2-y1, x2-x1);
+                    f3 = clipping_flags_y(y3, m_clip_box);
+                    line_clip_y(ras, x1, y1, m_clip_box.x1, y3, f1, f3);
+                    line_clip_y(ras, m_clip_box.x1, y3, m_clip_box.x1, y2, f3, f2);
+                    break;
+
+                case 6: // x1 > clip.x2 && x2 < clip.x1
+                    y3 = y1 + Conv::mul_div(m_clip_box.x2-x1, y2-y1, x2-x1);
+                    y4 = y1 + Conv::mul_div(m_clip_box.x1-x1, y2-y1, x2-x1);
+                    f3 = clipping_flags_y(y3, m_clip_box);
+                    f4 = clipping_flags_y(y4, m_clip_box);
+                    line_clip_y(ras, m_clip_box.x2, y1, m_clip_box.x2, y3, f1, f3);
+                    line_clip_y(ras, m_clip_box.x2, y3, m_clip_box.x1, y4, f3, f4);
+                    line_clip_y(ras, m_clip_box.x1, y4, m_clip_box.x1, y2, f4, f2);
+                    break;
+
+                case 8: // x1 < clip.x1
+                    y3 = y1 + Conv::mul_div(m_clip_box.x1-x1, y2-y1, x2-x1);
+                    f3 = clipping_flags_y(y3, m_clip_box);
+                    line_clip_y(ras, m_clip_box.x1, y1, m_clip_box.x1, y3, f1, f3);
+                    line_clip_y(ras, m_clip_box.x1, y3, x2, y2, f3, f2);
+                    break;
+
+                case 9:  // x1 < clip.x1 && x2 > clip.x2
+                    y3 = y1 + Conv::mul_div(m_clip_box.x1-x1, y2-y1, x2-x1);
+                    y4 = y1 + Conv::mul_div(m_clip_box.x2-x1, y2-y1, x2-x1);
+                    f3 = clipping_flags_y(y3, m_clip_box);
+                    f4 = clipping_flags_y(y4, m_clip_box);
+                    line_clip_y(ras, m_clip_box.x1, y1, m_clip_box.x1, y3, f1, f3);
+                    line_clip_y(ras, m_clip_box.x1, y3, m_clip_box.x2, y4, f3, f4);
+                    line_clip_y(ras, m_clip_box.x2, y4, m_clip_box.x2, y2, f4, f2);
+                    break;
+
+                case 12: // x1 < clip.x1 && x2 < clip.x1
+                    line_clip_y(ras, m_clip_box.x1, y1, m_clip_box.x1, y2, f1, f2);
+                    break;
+                }
+                m_f1 = f2;
+            }
+            else
+            {
+                ras.line(Conv::xi(m_x1), Conv::yi(m_y1), 
+                         Conv::xi(x2),   Conv::yi(y2)); 
+            }
+            m_x1 = x2;
+            m_y1 = y2;
+        }
+
+
+    private:
+        rect_type        m_clip_box;
+        coord_type       m_x1;
+        coord_type       m_y1;
+        unsigned         m_f1;
+        bool             m_clipping;
+    };
+
+
+
+
+    //---------------------------------------------------rasterizer_sl_no_clip
+    class rasterizer_sl_no_clip
+    {
+    public:
+        typedef ras_conv_int conv_type;
+        typedef int          coord_type;
+
+        rasterizer_sl_no_clip() : m_x1(0), m_y1(0) {}
+
+        void reset_clipping() {}
+        void clip_box(coord_type x1, coord_type y1, coord_type x2, coord_type y2) {}
+        void move_to(coord_type x1, coord_type y1) { m_x1 = x1; m_y1 = y1; }
+
+        template<class Rasterizer>
+        void line_to(Rasterizer& ras, coord_type x2, coord_type y2) 
+        { 
+            ras.line(m_x1, m_y1, x2, y2); 
+            m_x1 = x2; 
+            m_y1 = y2;
+        }
+
+    private:
+        int m_x1, m_y1;
+    };
+
+
+    //                                         -----rasterizer_sl_clip_int
+    //                                         -----rasterizer_sl_clip_int_sat
+    //                                         -----rasterizer_sl_clip_int_3x
+    //                                         -----rasterizer_sl_clip_dbl
+    //                                         -----rasterizer_sl_clip_dbl_3x
+    //------------------------------------------------------------------------
+    typedef rasterizer_sl_clip<ras_conv_int>     rasterizer_sl_clip_int;
+    typedef rasterizer_sl_clip<ras_conv_int_sat> rasterizer_sl_clip_int_sat;
+    typedef rasterizer_sl_clip<ras_conv_int_3x>  rasterizer_sl_clip_int_3x;
+    typedef rasterizer_sl_clip<ras_conv_dbl>     rasterizer_sl_clip_dbl;
+    typedef rasterizer_sl_clip<ras_conv_dbl_3x>  rasterizer_sl_clip_dbl_3x;
+
+
+}
+
+#endif

3rd/agg/include/agg_renderer_base.h

@@ -0,0 +1,731 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// class renderer_base
+//
+//----------------------------------------------------------------------------
+
+#ifndef AGG_RENDERER_BASE_INCLUDED
+#define AGG_RENDERER_BASE_INCLUDED
+
+#include "agg_basics.h"
+#include "agg_rendering_buffer.h"
+
+namespace agg
+{
+
+    //-----------------------------------------------------------renderer_base
+    template<class PixelFormat> class renderer_base
+    {
+    public:
+        typedef PixelFormat pixfmt_type;
+        typedef typename pixfmt_type::color_type color_type;
+        typedef typename pixfmt_type::row_data row_data;
+
+        //--------------------------------------------------------------------
+        renderer_base() : m_ren(0), m_clip_box(1, 1, 0, 0) {}
+        explicit renderer_base(pixfmt_type& ren) :
+            m_ren(&ren),
+            m_clip_box(0, 0, ren.width() - 1, ren.height() - 1)
+        {}
+        void attach(pixfmt_type& ren)
+        {
+            m_ren = &ren;
+            m_clip_box = rect_i(0, 0, ren.width() - 1, ren.height() - 1);
+        }
+
+        //--------------------------------------------------------------------
+        const pixfmt_type& ren() const { return *m_ren;  }
+        pixfmt_type& ren() { return *m_ren;  }
+          
+        //--------------------------------------------------------------------
+        unsigned width()  const { return m_ren->width();  }
+        unsigned height() const { return m_ren->height(); }
+
+        //--------------------------------------------------------------------
+        bool clip_box(int x1, int y1, int x2, int y2)
+        {
+            rect_i cb(x1, y1, x2, y2);
+            cb.normalize();
+            if(cb.clip(rect_i(0, 0, width() - 1, height() - 1)))
+            {
+                m_clip_box = cb;
+                return true;
+            }
+            m_clip_box.x1 = 1;
+            m_clip_box.y1 = 1;
+            m_clip_box.x2 = 0;
+            m_clip_box.y2 = 0;
+            return false;
+        }
+
+        //--------------------------------------------------------------------
+        void reset_clipping(bool visibility)
+        {
+            if(visibility)
+            {
+                m_clip_box.x1 = 0;
+                m_clip_box.y1 = 0;
+                m_clip_box.x2 = width() - 1;
+                m_clip_box.y2 = height() - 1;
+            }
+            else
+            {
+                m_clip_box.x1 = 1;
+                m_clip_box.y1 = 1;
+                m_clip_box.x2 = 0;
+                m_clip_box.y2 = 0;
+            }
+        }
+
+        //--------------------------------------------------------------------
+        void clip_box_naked(int x1, int y1, int x2, int y2)
+        {
+            m_clip_box.x1 = x1;
+            m_clip_box.y1 = y1;
+            m_clip_box.x2 = x2;
+            m_clip_box.y2 = y2;
+        }
+
+        //--------------------------------------------------------------------
+        bool inbox(int x, int y) const
+        {
+            return x >= m_clip_box.x1 && y >= m_clip_box.y1 &&
+                   x <= m_clip_box.x2 && y <= m_clip_box.y2;
+        }
+
+        //--------------------------------------------------------------------
+        const rect_i& clip_box() const { return m_clip_box;    }
+        int           xmin()     const { return m_clip_box.x1; }
+        int           ymin()     const { return m_clip_box.y1; }
+        int           xmax()     const { return m_clip_box.x2; }
+        int           ymax()     const { return m_clip_box.y2; }
+
+        //--------------------------------------------------------------------
+        const rect_i& bounding_clip_box() const { return m_clip_box;    }
+        int           bounding_xmin()     const { return m_clip_box.x1; }
+        int           bounding_ymin()     const { return m_clip_box.y1; }
+        int           bounding_xmax()     const { return m_clip_box.x2; }
+        int           bounding_ymax()     const { return m_clip_box.y2; }
+
+        //--------------------------------------------------------------------
+        void clear(const color_type& c)
+        {
+            unsigned y;
+            if(width())
+            {
+                for(y = 0; y < height(); y++)
+                {
+                    m_ren->copy_hline(0, y, width(), c);
+                }
+            }
+        }
+          
+
+        //--------------------------------------------------------------------
+        void fill(const color_type& c)
+        {
+            unsigned y;
+            if(width())
+            {
+                for(y = 0; y < height(); y++)
+                {
+                    m_ren->blend_hline(0, y, width(), c, cover_mask);
+                }
+            }
+        }
+        
+        //--------------------------------------------------------------------
+        void copy_pixel(int x, int y, const color_type& c)
+        {
+            if(inbox(x, y))
+            {
+                m_ren->copy_pixel(x, y, c);
+            }
+        }
+
+        //--------------------------------------------------------------------
+        void blend_pixel(int x, int y, const color_type& c, cover_type cover)
+        {
+            if(inbox(x, y))
+            {
+                m_ren->blend_pixel(x, y, c, cover);
+            }
+        }
+
+        //--------------------------------------------------------------------
+        color_type pixel(int x, int y) const
+        {
+            return inbox(x, y) ? 
+                   m_ren->pixel(x, y) :
+                   color_type::no_color();
+        }
+
+        //--------------------------------------------------------------------
+        void copy_hline(int x1, int y, int x2, const color_type& c)
+        {
+            if(x1 > x2) { int t = x2; x2 = x1; x1 = t; }
+            if(y  > ymax()) return;
+            if(y  < ymin()) return;
+            if(x1 > xmax()) return;
+            if(x2 < xmin()) return;
+
+            if(x1 < xmin()) x1 = xmin();
+            if(x2 > xmax()) x2 = xmax();
+
+            m_ren->copy_hline(x1, y, x2 - x1 + 1, c);
+        }
+
+        //--------------------------------------------------------------------
+        void copy_vline(int x, int y1, int y2, const color_type& c)
+        {
+            if(y1 > y2) { int t = y2; y2 = y1; y1 = t; }
+            if(x  > xmax()) return;
+            if(x  < xmin()) return;
+            if(y1 > ymax()) return;
+            if(y2 < ymin()) return;
+
+            if(y1 < ymin()) y1 = ymin();
+            if(y2 > ymax()) y2 = ymax();
+
+            m_ren->copy_vline(x, y1, y2 - y1 + 1, c);
+        }
+
+        //--------------------------------------------------------------------
+        void blend_hline(int x1, int y, int x2, 
+                         const color_type& c, cover_type cover)
+        {
+            if(x1 > x2) { int t = x2; x2 = x1; x1 = t; }
+            if(y  > ymax()) return;
+            if(y  < ymin()) return;
+            if(x1 > xmax()) return;
+            if(x2 < xmin()) return;
+
+            if(x1 < xmin()) x1 = xmin();
+            if(x2 > xmax()) x2 = xmax();
+
+            m_ren->blend_hline(x1, y, x2 - x1 + 1, c, cover);
+        }
+
+        //--------------------------------------------------------------------
+        void blend_vline(int x, int y1, int y2, 
+                         const color_type& c, cover_type cover)
+        {
+            if(y1 > y2) { int t = y2; y2 = y1; y1 = t; }
+            if(x  > xmax()) return;
+            if(x  < xmin()) return;
+            if(y1 > ymax()) return;
+            if(y2 < ymin()) return;
+
+            if(y1 < ymin()) y1 = ymin();
+            if(y2 > ymax()) y2 = ymax();
+
+            m_ren->blend_vline(x, y1, y2 - y1 + 1, c, cover);
+        }
+
+
+        //--------------------------------------------------------------------
+        void copy_bar(int x1, int y1, int x2, int y2, const color_type& c)
+        {
+            rect_i rc(x1, y1, x2, y2);
+            rc.normalize();
+            if(rc.clip(clip_box()))
+            {
+                int y;
+                for(y = rc.y1; y <= rc.y2; y++)
+                {
+                    m_ren->copy_hline(rc.x1, y, unsigned(rc.x2 - rc.x1 + 1), c);
+                }
+            }
+        }
+
+        //--------------------------------------------------------------------
+        void blend_bar(int x1, int y1, int x2, int y2, 
+                       const color_type& c, cover_type cover)
+        {
+            rect_i rc(x1, y1, x2, y2);
+            rc.normalize();
+            if(rc.clip(clip_box()))
+            {
+                int y;
+                for(y = rc.y1; y <= rc.y2; y++)
+                {
+                    m_ren->blend_hline(rc.x1,
+                                       y,
+                                       unsigned(rc.x2 - rc.x1 + 1), 
+                                       c, 
+                                       cover);
+                }
+            }
+        }
+
+        //--------------------------------------------------------------------
+        void blend_solid_hspan(int x, int y, int len, 
+                               const color_type& c, 
+                               const cover_type* covers)
+        {
+            if(y > ymax()) return;
+            if(y < ymin()) return;
+
+            if(x < xmin())
+            {
+                len -= xmin() - x;
+                if(len <= 0) return;
+                covers += xmin() - x;
+                x = xmin();
+            }
+            if(x + len > xmax())
+            {
+                len = xmax() - x + 1;
+                if(len <= 0) return;
+            }
+            m_ren->blend_solid_hspan(x, y, len, c, covers);
+        }
+
+        //--------------------------------------------------------------------
+        void blend_solid_vspan(int x, int y, int len, 
+                               const color_type& c, 
+                               const cover_type* covers)
+        {
+            if(x > xmax()) return;
+            if(x < xmin()) return;
+
+            if(y < ymin())
+            {
+                len -= ymin() - y;
+                if(len <= 0) return;
+                covers += ymin() - y;
+                y = ymin();
+            }
+            if(y + len > ymax())
+            {
+                len = ymax() - y + 1;
+                if(len <= 0) return;
+            }
+            m_ren->blend_solid_vspan(x, y, len, c, covers);
+        }
+
+
+        //--------------------------------------------------------------------
+        void copy_color_hspan(int x, int y, int len, const color_type* colors)
+        {
+            if(y > ymax()) return;
+            if(y < ymin()) return;
+
+            if(x < xmin())
+            {
+                int d = xmin() - x;
+                len -= d;
+                if(len <= 0) return;
+                colors += d;
+                x = xmin();
+            }
+            if(x + len > xmax())
+            {
+                len = xmax() - x + 1;
+                if(len <= 0) return;
+            }
+            m_ren->copy_color_hspan(x, y, len, colors);
+        }
+
+
+        //--------------------------------------------------------------------
+        void copy_color_vspan(int x, int y, int len, const color_type* colors)
+        {
+            if(x > xmax()) return;
+            if(x < xmin()) return;
+
+            if(y < ymin())
+            {
+                int d = ymin() - y;
+                len -= d;
+                if(len <= 0) return;
+                colors += d;
+                y = ymin();
+            }
+            if(y + len > ymax())
+            {
+                len = ymax() - y + 1;
+                if(len <= 0) return;
+            }
+            m_ren->copy_color_vspan(x, y, len, colors);
+        }
+
+
+        //--------------------------------------------------------------------
+        void blend_color_hspan(int x, int y, int len, 
+                               const color_type* colors, 
+                               const cover_type* covers,
+                               cover_type cover = agg::cover_full)
+        {
+            if(y > ymax()) return;
+            if(y < ymin()) return;
+
+            if(x < xmin())
+            {
+                int d = xmin() - x;
+                len -= d;
+                if(len <= 0) return;
+                if(covers) covers += d;
+                colors += d;
+                x = xmin();
+            }
+            if(x + len > xmax())
+            {
+                len = xmax() - x + 1;
+                if(len <= 0) return;
+            }
+            m_ren->blend_color_hspan(x, y, len, colors, covers, cover);
+        }
+
+        //--------------------------------------------------------------------
+        void blend_color_vspan(int x, int y, int len, 
+                               const color_type* colors, 
+                               const cover_type* covers,
+                               cover_type cover = agg::cover_full)
+        {
+            if(x > xmax()) return;
+            if(x < xmin()) return;
+
+            if(y < ymin())
+            {
+                int d = ymin() - y;
+                len -= d;
+                if(len <= 0) return;
+                if(covers) covers += d;
+                colors += d;
+                y = ymin();
+            }
+            if(y + len > ymax())
+            {
+                len = ymax() - y + 1;
+                if(len <= 0) return;
+            }
+            m_ren->blend_color_vspan(x, y, len, colors, covers, cover);
+        }
+
+        //--------------------------------------------------------------------
+        rect_i clip_rect_area(rect_i& dst, rect_i& src, int wsrc, int hsrc) const
+        {
+            rect_i rc(0,0,0,0);
+            rect_i cb = clip_box();
+            ++cb.x2;
+            ++cb.y2;
+
+            if(src.x1 < 0)
+            {
+                dst.x1 -= src.x1;
+                src.x1 = 0;
+            }
+            if(src.y1 < 0)
+            {
+                dst.y1 -= src.y1;
+                src.y1 = 0;
+            }
+
+            if(src.x2 > wsrc) src.x2 = wsrc;
+            if(src.y2 > hsrc) src.y2 = hsrc;
+
+            if(dst.x1 < cb.x1)
+            {
+                src.x1 += cb.x1 - dst.x1;
+                dst.x1 = cb.x1;
+            }
+            if(dst.y1 < cb.y1)
+            {
+                src.y1 += cb.y1 - dst.y1;
+                dst.y1 = cb.y1;
+            }
+
+            if(dst.x2 > cb.x2) dst.x2 = cb.x2;
+            if(dst.y2 > cb.y2) dst.y2 = cb.y2;
+
+            rc.x2 = dst.x2 - dst.x1;
+            rc.y2 = dst.y2 - dst.y1;
+
+            if(rc.x2 > src.x2 - src.x1) rc.x2 = src.x2 - src.x1;
+            if(rc.y2 > src.y2 - src.y1) rc.y2 = src.y2 - src.y1;
+            return rc;
+        }
+
+        //--------------------------------------------------------------------
+        template<class RenBuf>
+        void copy_from(const RenBuf& src, 
+                       const rect_i* rect_src_ptr = 0, 
+                       int dx = 0, 
+                       int dy = 0)
+        {
+            rect_i rsrc(0, 0, src.width(), src.height());
+            if(rect_src_ptr)
+            {
+                rsrc.x1 = rect_src_ptr->x1; 
+                rsrc.y1 = rect_src_ptr->y1;
+                rsrc.x2 = rect_src_ptr->x2 + 1;
+                rsrc.y2 = rect_src_ptr->y2 + 1;
+            }
+
+            // Version with xdst, ydst (absolute positioning)
+            //rect_i rdst(xdst, ydst, xdst + rsrc.x2 - rsrc.x1, ydst + rsrc.y2 - rsrc.y1);
+
+            // Version with dx, dy (relative positioning)
+            rect_i rdst(rsrc.x1 + dx, rsrc.y1 + dy, rsrc.x2 + dx, rsrc.y2 + dy);
+
+            rect_i rc = clip_rect_area(rdst, rsrc, src.width(), src.height());
+
+            if(rc.x2 > 0)
+            {
+                int incy = 1;
+                if(rdst.y1 > rsrc.y1)
+                {
+                    rsrc.y1 += rc.y2 - 1;
+                    rdst.y1 += rc.y2 - 1;
+                    incy = -1;
+                }
+                while(rc.y2 > 0)
+                {
+                    m_ren->copy_from(src, 
+                                     rdst.x1, rdst.y1,
+                                     rsrc.x1, rsrc.y1,
+                                     rc.x2);
+                    rdst.y1 += incy;
+                    rsrc.y1 += incy;
+                    --rc.y2;
+                }
+            }
+        }
+
+        //--------------------------------------------------------------------
+        template<class SrcPixelFormatRenderer>
+        void blend_from(const SrcPixelFormatRenderer& src, 
+                        const rect_i* rect_src_ptr = 0, 
+                        int dx = 0, 
+                        int dy = 0,
+                        cover_type cover = agg::cover_full)
+        {
+            rect_i rsrc(0, 0, src.width(), src.height());
+            if(rect_src_ptr)
+            {
+                rsrc.x1 = rect_src_ptr->x1; 
+                rsrc.y1 = rect_src_ptr->y1;
+                rsrc.x2 = rect_src_ptr->x2 + 1;
+                rsrc.y2 = rect_src_ptr->y2 + 1;
+            }
+
+            // Version with xdst, ydst (absolute positioning)
+            //rect_i rdst(xdst, ydst, xdst + rsrc.x2 - rsrc.x1, ydst + rsrc.y2 - rsrc.y1);
+
+            // Version with dx, dy (relative positioning)
+            rect_i rdst(rsrc.x1 + dx, rsrc.y1 + dy, rsrc.x2 + dx, rsrc.y2 + dy);
+            rect_i rc = clip_rect_area(rdst, rsrc, src.width(), src.height());
+
+            if(rc.x2 > 0)
+            {
+                int incy = 1;
+                if(rdst.y1 > rsrc.y1)
+                {
+                    rsrc.y1 += rc.y2 - 1;
+                    rdst.y1 += rc.y2 - 1;
+                    incy = -1;
+                }
+                while(rc.y2 > 0)
+                {
+                    typename SrcPixelFormatRenderer::row_data rw = src.row(rsrc.y1);
+                    if(rw.ptr)
+                    {
+                        int x1src = rsrc.x1;
+                        int x1dst = rdst.x1;
+                        int len   = rc.x2;
+                        if(rw.x1 > x1src)
+                        {
+                            x1dst += rw.x1 - x1src;
+                            len   -= rw.x1 - x1src;
+                            x1src  = rw.x1;
+                        }
+                        if(len > 0)
+                        {
+                            if(x1src + len-1 > rw.x2)
+                            {
+                                len -= x1src + len - rw.x2 - 1;
+                            }
+                            if(len > 0)
+                            {
+                                m_ren->blend_from(src,
+                                                  x1dst, rdst.y1,
+                                                  x1src, rsrc.y1,
+                                                  len,
+                                                  cover);
+                            }
+                        }
+                    }
+                    rdst.y1 += incy;
+                    rsrc.y1 += incy;
+                    --rc.y2;
+                }
+            }
+        }
+
+        //--------------------------------------------------------------------
+        template<class SrcPixelFormatRenderer>
+        void blend_from_color(const SrcPixelFormatRenderer& src, 
+                              const color_type& color,
+                              const rect_i* rect_src_ptr = 0, 
+                              int dx = 0, 
+                              int dy = 0,
+                              cover_type cover = agg::cover_full)
+        {
+            rect_i rsrc(0, 0, src.width(), src.height());
+            if(rect_src_ptr)
+            {
+                rsrc.x1 = rect_src_ptr->x1; 
+                rsrc.y1 = rect_src_ptr->y1;
+                rsrc.x2 = rect_src_ptr->x2 + 1;
+                rsrc.y2 = rect_src_ptr->y2 + 1;
+            }
+
+            // Version with xdst, ydst (absolute positioning)
+            //rect_i rdst(xdst, ydst, xdst + rsrc.x2 - rsrc.x1, ydst + rsrc.y2 - rsrc.y1);
+
+            // Version with dx, dy (relative positioning)
+            rect_i rdst(rsrc.x1 + dx, rsrc.y1 + dy, rsrc.x2 + dx, rsrc.y2 + dy);
+            rect_i rc = clip_rect_area(rdst, rsrc, src.width(), src.height());
+
+            if(rc.x2 > 0)
+            {
+                int incy = 1;
+                if(rdst.y1 > rsrc.y1)
+                {
+                    rsrc.y1 += rc.y2 - 1;
+                    rdst.y1 += rc.y2 - 1;
+                    incy = -1;
+                }
+                while(rc.y2 > 0)
+                {
+                    typename SrcPixelFormatRenderer::row_data rw = src.row(rsrc.y1);
+                    if(rw.ptr)
+                    {
+                        int x1src = rsrc.x1;
+                        int x1dst = rdst.x1;
+                        int len   = rc.x2;
+                        if(rw.x1 > x1src)
+                        {
+                            x1dst += rw.x1 - x1src;
+                            len   -= rw.x1 - x1src;
+                            x1src  = rw.x1;
+                        }
+                        if(len > 0)
+                        {
+                            if(x1src + len-1 > rw.x2)
+                            {
+                                len -= x1src + len - rw.x2 - 1;
+                            }
+                            if(len > 0)
+                            {
+                                m_ren->blend_from_color(src,
+                                                        color,
+                                                        x1dst, rdst.y1,
+                                                        x1src, rsrc.y1,
+                                                        len,
+                                                        cover);
+                            }
+                        }
+                    }
+                    rdst.y1 += incy;
+                    rsrc.y1 += incy;
+                    --rc.y2;
+                }
+            }
+        }
+
+        //--------------------------------------------------------------------
+        template<class SrcPixelFormatRenderer>
+        void blend_from_lut(const SrcPixelFormatRenderer& src, 
+                            const color_type* color_lut,
+                            const rect_i* rect_src_ptr = 0, 
+                            int dx = 0, 
+                            int dy = 0,
+                            cover_type cover = agg::cover_full)
+        {
+            rect_i rsrc(0, 0, src.width(), src.height());
+            if(rect_src_ptr)
+            {
+                rsrc.x1 = rect_src_ptr->x1; 
+                rsrc.y1 = rect_src_ptr->y1;
+                rsrc.x2 = rect_src_ptr->x2 + 1;
+                rsrc.y2 = rect_src_ptr->y2 + 1;
+            }
+
+            // Version with xdst, ydst (absolute positioning)
+            //rect_i rdst(xdst, ydst, xdst + rsrc.x2 - rsrc.x1, ydst + rsrc.y2 - rsrc.y1);
+
+            // Version with dx, dy (relative positioning)
+            rect_i rdst(rsrc.x1 + dx, rsrc.y1 + dy, rsrc.x2 + dx, rsrc.y2 + dy);
+            rect_i rc = clip_rect_area(rdst, rsrc, src.width(), src.height());
+
+            if(rc.x2 > 0)
+            {
+                int incy = 1;
+                if(rdst.y1 > rsrc.y1)
+                {
+                    rsrc.y1 += rc.y2 - 1;
+                    rdst.y1 += rc.y2 - 1;
+                    incy = -1;
+                }
+                while(rc.y2 > 0)
+                {
+                    typename SrcPixelFormatRenderer::row_data rw = src.row(rsrc.y1);
+                    if(rw.ptr)
+                    {
+                        int x1src = rsrc.x1;
+                        int x1dst = rdst.x1;
+                        int len   = rc.x2;
+                        if(rw.x1 > x1src)
+                        {
+                            x1dst += rw.x1 - x1src;
+                            len   -= rw.x1 - x1src;
+                            x1src  = rw.x1;
+                        }
+                        if(len > 0)
+                        {
+                            if(x1src + len-1 > rw.x2)
+                            {
+                                len -= x1src + len - rw.x2 - 1;
+                            }
+                            if(len > 0)
+                            {
+                                m_ren->blend_from_lut(src,
+                                                      color_lut,
+                                                      x1dst, rdst.y1,
+                                                      x1src, rsrc.y1,
+                                                      len,
+                                                      cover);
+                            }
+                        }
+                    }
+                    rdst.y1 += incy;
+                    rsrc.y1 += incy;
+                    --rc.y2;
+                }
+            }
+        }
+
+    private:
+        pixfmt_type* m_ren;
+        rect_i       m_clip_box;
+    };
+
+
+}
+
+#endif

3rd/agg/include/agg_renderer_scanline.h

@@ -0,0 +1,852 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+
+#ifndef AGG_RENDERER_SCANLINE_INCLUDED
+#define AGG_RENDERER_SCANLINE_INCLUDED
+
+#include "agg_basics.h"
+#include "agg_renderer_base.h"
+
+namespace agg
+{
+
+    //================================================render_scanline_aa_solid
+    template<class Scanline, class BaseRenderer, class ColorT> 
+    void render_scanline_aa_solid(const Scanline& sl, 
+                                  BaseRenderer& ren, 
+                                  const ColorT& color)
+    {
+        int y = sl.y();
+        unsigned num_spans = sl.num_spans();
+        typename Scanline::const_iterator span = sl.begin();
+
+        for(;;)
+        {
+            int x = span->x;
+            if(span->len > 0)
+            {
+                ren.blend_solid_hspan(x, y, (unsigned)span->len, 
+                                      color, 
+                                      span->covers);
+            }
+            else
+            {
+                ren.blend_hline(x, y, (unsigned)(x - span->len - 1), 
+                                color, 
+                                *(span->covers));
+            }
+            if(--num_spans == 0) break;
+            ++span;
+        }
+    }
+
+    //===============================================render_scanlines_aa_solid
+    template<class Rasterizer, class Scanline, 
+             class BaseRenderer, class ColorT>
+    void render_scanlines_aa_solid(Rasterizer& ras, Scanline& sl, 
+                                   BaseRenderer& ren, const ColorT& color)
+    {
+        if(ras.rewind_scanlines())
+        {
+            // Explicitly convert "color" to the BaseRenderer color type.
+            // For example, it can be called with color type "rgba", while
+            // "rgba8" is needed. Otherwise it will be implicitly 
+            // converted in the loop many times.
+            //----------------------
+            typename BaseRenderer::color_type ren_color = color;
+
+            sl.reset(ras.min_x(), ras.max_x());
+            while(ras.sweep_scanline(sl))
+            {
+                //render_scanline_aa_solid(sl, ren, ren_color);
+
+                // This code is equivalent to the above call (copy/paste). 
+                // It's just a "manual" optimization for old compilers,
+                // like Microsoft Visual C++ v6.0
+                //-------------------------------
+                int y = sl.y();
+                unsigned num_spans = sl.num_spans();
+                typename Scanline::const_iterator span = sl.begin();
+
+                for(;;)
+                {
+                    int x = span->x;
+                    if(span->len > 0)
+                    {
+                        ren.blend_solid_hspan(x, y, (unsigned)span->len, 
+                                              ren_color, 
+                                              span->covers);
+                    }
+                    else
+                    {
+                        ren.blend_hline(x, y, (unsigned)(x - span->len - 1), 
+                                        ren_color, 
+                                        *(span->covers));
+                    }
+                    if(--num_spans == 0) break;
+                    ++span;
+                }
+            }
+        }
+    }
+
+    //==============================================renderer_scanline_aa_solid
+    template<class BaseRenderer> class renderer_scanline_aa_solid
+    {
+    public:
+        typedef BaseRenderer base_ren_type;
+        typedef typename base_ren_type::color_type color_type;
+
+        //--------------------------------------------------------------------
+        renderer_scanline_aa_solid() : m_ren(0) {}
+        explicit renderer_scanline_aa_solid(base_ren_type& ren) : m_ren(&ren) {}
+        void attach(base_ren_type& ren)
+        {
+            m_ren = &ren;
+        }
+        
+        //--------------------------------------------------------------------
+        void color(const color_type& c) { m_color = c; }
+        const color_type& color() const { return m_color; }
+
+        //--------------------------------------------------------------------
+        void prepare() {}
+
+        //--------------------------------------------------------------------
+        template<class Scanline> void render(const Scanline& sl)
+        {
+            render_scanline_aa_solid(sl, *m_ren, m_color);
+        }
+        
+    private:
+        base_ren_type* m_ren;
+        color_type m_color;
+    };
+
+
+
+
+
+
+
+
+
+
+
+
+
+    //======================================================render_scanline_aa
+    template<class Scanline, class BaseRenderer, 
+             class SpanAllocator, class SpanGenerator> 
+    void render_scanline_aa(const Scanline& sl, BaseRenderer& ren, 
+                            SpanAllocator& alloc, SpanGenerator& span_gen)
+    {
+        int y = sl.y();
+
+        unsigned num_spans = sl.num_spans();
+        typename Scanline::const_iterator span = sl.begin();
+        for(;;)
+        {
+            int x = span->x;
+            int len = span->len;
+            const typename Scanline::cover_type* covers = span->covers;
+
+            if(len < 0) len = -len;
+            typename BaseRenderer::color_type* colors = alloc.allocate(len);
+            span_gen.generate(colors, x, y, len);
+            ren.blend_color_hspan(x, y, len, colors, 
+                                  (span->len < 0) ? 0 : covers, *covers);
+
+            if(--num_spans == 0) break;
+            ++span;
+        }
+    }
+
+    //=====================================================render_scanlines_aa
+    template<class Rasterizer, class Scanline, class BaseRenderer, 
+             class SpanAllocator, class SpanGenerator>
+    void render_scanlines_aa(Rasterizer& ras, Scanline& sl, BaseRenderer& ren, 
+                             SpanAllocator& alloc, SpanGenerator& span_gen)
+    {
+        if(ras.rewind_scanlines())
+        {
+            sl.reset(ras.min_x(), ras.max_x());
+            span_gen.prepare();
+            while(ras.sweep_scanline(sl))
+            {
+                render_scanline_aa(sl, ren, alloc, span_gen);
+            }
+        }
+    }
+
+    //====================================================renderer_scanline_aa
+    template<class BaseRenderer, class SpanAllocator, class SpanGenerator> 
+    class renderer_scanline_aa
+    {
+    public:
+        typedef BaseRenderer  base_ren_type;
+        typedef SpanAllocator alloc_type;
+        typedef SpanGenerator span_gen_type;
+
+        //--------------------------------------------------------------------
+        renderer_scanline_aa() : m_ren(0), m_alloc(0), m_span_gen(0) {}
+        renderer_scanline_aa(base_ren_type& ren, 
+                             alloc_type& alloc, 
+                             span_gen_type& span_gen) :
+            m_ren(&ren),
+            m_alloc(&alloc),
+            m_span_gen(&span_gen)
+        {}
+        void attach(base_ren_type& ren, 
+                    alloc_type& alloc, 
+                    span_gen_type& span_gen)
+        {
+            m_ren = &ren;
+            m_alloc = &alloc;
+            m_span_gen = &span_gen;
+        }
+        
+        //--------------------------------------------------------------------
+        void prepare() { m_span_gen->prepare(); }
+
+        //--------------------------------------------------------------------
+        template<class Scanline> void render(const Scanline& sl)
+        {
+            render_scanline_aa(sl, *m_ren, *m_alloc, *m_span_gen);
+        }
+
+    private:
+        base_ren_type* m_ren;
+        alloc_type*    m_alloc;
+        span_gen_type* m_span_gen;
+    };
+
+
+
+
+
+
+    //===============================================render_scanline_bin_solid
+    template<class Scanline, class BaseRenderer, class ColorT> 
+    void render_scanline_bin_solid(const Scanline& sl, 
+                                   BaseRenderer& ren, 
+                                   const ColorT& color)
+    {
+        unsigned num_spans = sl.num_spans();
+        typename Scanline::const_iterator span = sl.begin();
+        for(;;)
+        {
+            ren.blend_hline(span->x, 
+                            sl.y(), 
+                            span->x - 1 + ((span->len < 0) ? 
+                                              -span->len : 
+                                               span->len), 
+                               color, 
+                               cover_full);
+            if(--num_spans == 0) break;
+            ++span;
+        }
+    }
+
+    //==============================================render_scanlines_bin_solid
+    template<class Rasterizer, class Scanline, 
+             class BaseRenderer, class ColorT>
+    void render_scanlines_bin_solid(Rasterizer& ras, Scanline& sl, 
+                                    BaseRenderer& ren, const ColorT& color)
+    {
+        if(ras.rewind_scanlines())
+        {
+            // Explicitly convert "color" to the BaseRenderer color type.
+            // For example, it can be called with color type "rgba", while
+            // "rgba8" is needed. Otherwise it will be implicitly 
+            // converted in the loop many times.
+            //----------------------
+            typename BaseRenderer::color_type ren_color(color);
+
+            sl.reset(ras.min_x(), ras.max_x());
+            while(ras.sweep_scanline(sl))
+            {
+                //render_scanline_bin_solid(sl, ren, ren_color);
+
+                // This code is equivalent to the above call (copy/paste). 
+                // It's just a "manual" optimization for old compilers,
+                // like Microsoft Visual C++ v6.0
+                //-------------------------------
+                unsigned num_spans = sl.num_spans();
+                typename Scanline::const_iterator span = sl.begin();
+                for(;;)
+                {
+                    ren.blend_hline(span->x, 
+                                    sl.y(), 
+                                    span->x - 1 + ((span->len < 0) ? 
+                                                      -span->len : 
+                                                       span->len), 
+                                       ren_color, 
+                                       cover_full);
+                    if(--num_spans == 0) break;
+                    ++span;
+                }
+            }
+        }
+    }
+
+    //=============================================renderer_scanline_bin_solid
+    template<class BaseRenderer> class renderer_scanline_bin_solid
+    {
+    public:
+        typedef BaseRenderer base_ren_type;
+        typedef typename base_ren_type::color_type color_type;
+
+        //--------------------------------------------------------------------
+        renderer_scanline_bin_solid() : m_ren(0) {}
+        explicit renderer_scanline_bin_solid(base_ren_type& ren) : m_ren(&ren) {}
+        void attach(base_ren_type& ren)
+        {
+            m_ren = &ren;
+        }
+        
+        //--------------------------------------------------------------------
+        void color(const color_type& c) { m_color = c; }
+        const color_type& color() const { return m_color; }
+
+        //--------------------------------------------------------------------
+        void prepare() {}
+
+        //--------------------------------------------------------------------
+        template<class Scanline> void render(const Scanline& sl)
+        {
+            render_scanline_bin_solid(sl, *m_ren, m_color);
+        }
+        
+    private:
+        base_ren_type* m_ren;
+        color_type m_color;
+    };
+
+
+
+
+
+
+
+
+    //======================================================render_scanline_bin
+    template<class Scanline, class BaseRenderer, 
+             class SpanAllocator, class SpanGenerator> 
+    void render_scanline_bin(const Scanline& sl, BaseRenderer& ren, 
+                             SpanAllocator& alloc, SpanGenerator& span_gen)
+    {
+        int y = sl.y();
+
+        unsigned num_spans = sl.num_spans();
+        typename Scanline::const_iterator span = sl.begin();
+        for(;;)
+        {
+            int x = span->x;
+            int len = span->len;
+            if(len < 0) len = -len;
+            typename BaseRenderer::color_type* colors = alloc.allocate(len);
+            span_gen.generate(colors, x, y, len);
+            ren.blend_color_hspan(x, y, len, colors, 0, cover_full); 
+            if(--num_spans == 0) break;
+            ++span;
+        }
+    }
+
+    //=====================================================render_scanlines_bin
+    template<class Rasterizer, class Scanline, class BaseRenderer, 
+             class SpanAllocator, class SpanGenerator>
+    void render_scanlines_bin(Rasterizer& ras, Scanline& sl, BaseRenderer& ren, 
+                              SpanAllocator& alloc, SpanGenerator& span_gen)
+    {
+        if(ras.rewind_scanlines())
+        {
+            sl.reset(ras.min_x(), ras.max_x());
+            span_gen.prepare();
+            while(ras.sweep_scanline(sl))
+            {
+                render_scanline_bin(sl, ren, alloc, span_gen);
+            }
+        }
+    }
+
+    //====================================================renderer_scanline_bin
+    template<class BaseRenderer, class SpanAllocator, class SpanGenerator> 
+    class renderer_scanline_bin
+    {
+    public:
+        typedef BaseRenderer  base_ren_type;
+        typedef SpanAllocator alloc_type;
+        typedef SpanGenerator span_gen_type;
+
+        //--------------------------------------------------------------------
+        renderer_scanline_bin() : m_ren(0), m_alloc(0), m_span_gen(0) {}
+        renderer_scanline_bin(base_ren_type& ren, 
+                              alloc_type& alloc, 
+                              span_gen_type& span_gen) :
+            m_ren(&ren),
+            m_alloc(&alloc),
+            m_span_gen(&span_gen)
+        {}
+        void attach(base_ren_type& ren, 
+                    alloc_type& alloc, 
+                    span_gen_type& span_gen)
+        {
+            m_ren = &ren;
+            m_alloc = &alloc;
+            m_span_gen = &span_gen;
+        }
+        
+        //--------------------------------------------------------------------
+        void prepare() { m_span_gen->prepare(); }
+
+        //--------------------------------------------------------------------
+        template<class Scanline> void render(const Scanline& sl)
+        {
+            render_scanline_bin(sl, *m_ren, *m_alloc, *m_span_gen);
+        }
+
+    private:
+        base_ren_type* m_ren;
+        alloc_type*    m_alloc;
+        span_gen_type* m_span_gen;
+    };
+
+
+
+
+
+
+
+
+
+
+    //========================================================render_scanlines
+    template<class Rasterizer, class Scanline, class Renderer>
+    void render_scanlines(Rasterizer& ras, Scanline& sl, Renderer& ren)
+    {
+        if(ras.rewind_scanlines())
+        {
+            sl.reset(ras.min_x(), ras.max_x());
+            ren.prepare();
+            while(ras.sweep_scanline(sl))
+            {
+                ren.render(sl);
+            }
+        }
+    }
+
+    //========================================================render_all_paths
+    template<class Rasterizer, class Scanline, class Renderer, 
+             class VertexSource, class ColorStorage, class PathId>
+    void render_all_paths(Rasterizer& ras, 
+                          Scanline& sl,
+                          Renderer& r, 
+                          VertexSource& vs, 
+                          const ColorStorage& as, 
+                          const PathId& path_id,
+                          unsigned num_paths)
+    {
+        for(unsigned i = 0; i < num_paths; i++)
+        {
+            ras.reset();
+            ras.add_path(vs, path_id[i]);
+            r.color(as[i]);
+            render_scanlines(ras, sl, r);
+        }
+    }
+
+
+
+
+
+
+    //=============================================render_scanlines_compound
+    template<class Rasterizer, 
+             class ScanlineAA, 
+             class ScanlineBin, 
+             class BaseRenderer, 
+             class SpanAllocator,
+             class StyleHandler>
+    void render_scanlines_compound(Rasterizer& ras, 
+                                   ScanlineAA& sl_aa,
+                                   ScanlineBin& sl_bin,
+                                   BaseRenderer& ren,
+                                   SpanAllocator& alloc,
+                                   StyleHandler& sh)
+    {
+        if(ras.rewind_scanlines())
+        {
+            int min_x = ras.min_x();
+            int len = ras.max_x() - min_x + 2;
+            sl_aa.reset(min_x, ras.max_x());
+            sl_bin.reset(min_x, ras.max_x());
+
+            typedef typename BaseRenderer::color_type color_type;
+            color_type* color_span = alloc.allocate(len * 2);
+            color_type* mix_buffer = color_span + len;
+            unsigned num_spans;
+
+            unsigned num_styles;
+            unsigned style;
+            bool     solid;
+            while((num_styles = ras.sweep_styles()) > 0)
+            {
+                typename ScanlineAA::const_iterator span_aa;
+                if(num_styles == 1)
+                {
+                    // Optimization for a single style. Happens often
+                    //-------------------------
+                    if(ras.sweep_scanline(sl_aa, 0))
+                    {
+                        style = ras.style(0);
+                        if(sh.is_solid(style))
+                        {
+                            // Just solid fill
+                            //-----------------------
+                            render_scanline_aa_solid(sl_aa, ren, sh.color(style));
+                        }
+                        else
+                        {
+                            // Arbitrary span generator
+                            //-----------------------
+                            span_aa   = sl_aa.begin();
+                            num_spans = sl_aa.num_spans();
+                            for(;;)
+                            {
+                                len = span_aa->len;
+                                sh.generate_span(color_span, 
+                                                 span_aa->x, 
+                                                 sl_aa.y(), 
+                                                 len, 
+                                                 style);
+
+                                ren.blend_color_hspan(span_aa->x, 
+                                                      sl_aa.y(), 
+                                                      span_aa->len,
+                                                      color_span,
+                                                      span_aa->covers);
+                                if(--num_spans == 0) break;
+                                ++span_aa;
+                            }
+                        }
+                    }
+                }
+                else
+                {
+                    if(ras.sweep_scanline(sl_bin, -1))
+                    {
+                        // Clear the spans of the mix_buffer
+                        //--------------------
+                        typename ScanlineBin::const_iterator span_bin = sl_bin.begin();
+                        num_spans = sl_bin.num_spans();
+                        for(;;)
+                        {
+                            memset(mix_buffer + span_bin->x - min_x, 
+                                   0, 
+                                   span_bin->len * sizeof(color_type));
+
+                            if(--num_spans == 0) break;
+                            ++span_bin;
+                        }
+
+                        unsigned i;
+                        for(i = 0; i < num_styles; i++)
+                        {
+                            style = ras.style(i);
+                            solid = sh.is_solid(style);
+
+                            if(ras.sweep_scanline(sl_aa, i))
+                            {
+                                color_type* colors;
+                                color_type* cspan;
+                                typename ScanlineAA::cover_type* covers;
+                                span_aa   = sl_aa.begin();
+                                num_spans = sl_aa.num_spans();
+                                if(solid)
+                                {
+                                    // Just solid fill
+                                    //-----------------------
+                                    for(;;)
+                                    {
+                                        color_type c = sh.color(style);
+                                        len    = span_aa->len;
+                                        colors = mix_buffer + span_aa->x - min_x;
+                                        covers = span_aa->covers;
+                                        do
+                                        {
+                                            if(*covers == cover_full) 
+                                            {
+                                                *colors = c;
+                                            }
+                                            else
+                                            {
+                                                colors->add(c, *covers);
+                                            }
+                                            ++colors;
+                                            ++covers;
+                                        }
+                                        while(--len);
+                                        if(--num_spans == 0) break;
+                                        ++span_aa;
+                                    }
+                                }
+                                else
+                                {
+                                    // Arbitrary span generator
+                                    //-----------------------
+                                    for(;;)
+                                    {
+                                        len = span_aa->len;
+                                        colors = mix_buffer + span_aa->x - min_x;
+                                        cspan  = color_span;
+                                        sh.generate_span(cspan, 
+                                                         span_aa->x, 
+                                                         sl_aa.y(), 
+                                                         len, 
+                                                         style);
+                                        covers = span_aa->covers;
+                                        do
+                                        {
+                                            if(*covers == cover_full) 
+                                            {
+                                                *colors = *cspan;
+                                            }
+                                            else
+                                            {
+                                                colors->add(*cspan, *covers);
+                                            }
+                                            ++cspan;
+                                            ++colors;
+                                            ++covers;
+                                        }
+                                        while(--len);
+                                        if(--num_spans == 0) break;
+                                        ++span_aa;
+                                    }
+                                }
+                            }
+                        }
+
+                        // Emit the blended result as a color hspan
+                        //-------------------------
+                        span_bin = sl_bin.begin();
+                        num_spans = sl_bin.num_spans();
+                        for(;;)
+                        {
+                            ren.blend_color_hspan(span_bin->x, 
+                                                  sl_bin.y(), 
+                                                  span_bin->len,
+                                                  mix_buffer + span_bin->x - min_x,
+                                                  0,
+                                                  cover_full);
+                            if(--num_spans == 0) break;
+                            ++span_bin;
+                        }
+                    } // if(ras.sweep_scanline(sl_bin, -1))
+                } // if(num_styles == 1) ... else
+            } // while((num_styles = ras.sweep_styles()) > 0)
+        } // if(ras.rewind_scanlines())
+    }
+
+    //=======================================render_scanlines_compound_layered
+    template<class Rasterizer, 
+             class ScanlineAA, 
+             class BaseRenderer, 
+             class SpanAllocator,
+             class StyleHandler>
+    void render_scanlines_compound_layered(Rasterizer& ras, 
+                                           ScanlineAA& sl_aa,
+                                           BaseRenderer& ren,
+                                           SpanAllocator& alloc,
+                                           StyleHandler& sh)
+    {
+        if(ras.rewind_scanlines())
+        {
+            int min_x = ras.min_x();
+            int len = ras.max_x() - min_x + 2;
+            sl_aa.reset(min_x, ras.max_x());
+
+            typedef typename BaseRenderer::color_type color_type;
+            color_type* color_span   = alloc.allocate(len * 2);
+            color_type* mix_buffer   = color_span + len;
+            cover_type* cover_buffer = ras.allocate_cover_buffer(len);
+            unsigned num_spans;
+
+            unsigned num_styles;
+            unsigned style;
+            bool     solid;
+            while((num_styles = ras.sweep_styles()) > 0)
+            {
+                typename ScanlineAA::const_iterator span_aa;
+                if(num_styles == 1)
+                {
+                    // Optimization for a single style. Happens often
+                    //-------------------------
+                    if(ras.sweep_scanline(sl_aa, 0))
+                    {
+                        style = ras.style(0);
+                        if(sh.is_solid(style))
+                        {
+                            // Just solid fill
+                            //-----------------------
+                            render_scanline_aa_solid(sl_aa, ren, sh.color(style));
+                        }
+                        else
+                        {
+                            // Arbitrary span generator
+                            //-----------------------
+                            span_aa   = sl_aa.begin();
+                            num_spans = sl_aa.num_spans();
+                            for(;;)
+                            {
+                                len = span_aa->len;
+                                sh.generate_span(color_span, 
+                                                 span_aa->x, 
+                                                 sl_aa.y(), 
+                                                 len, 
+                                                 style);
+
+                                ren.blend_color_hspan(span_aa->x, 
+                                                      sl_aa.y(), 
+                                                      span_aa->len,
+                                                      color_span,
+                                                      span_aa->covers);
+                                if(--num_spans == 0) break;
+                                ++span_aa;
+                            }
+                        }
+                    }
+                }
+                else
+                {
+                    int      sl_start = ras.scanline_start();
+                    unsigned sl_len   = ras.scanline_length();
+
+                    if(sl_len)
+                    {
+                        memset(mix_buffer + sl_start - min_x, 
+                               0, 
+                               sl_len * sizeof(color_type));
+
+                        memset(cover_buffer + sl_start - min_x, 
+                               0, 
+                               sl_len * sizeof(cover_type));
+
+                        int sl_y = 0x7FFFFFFF;
+                        unsigned i;
+                        for(i = 0; i < num_styles; i++)
+                        {
+                            style = ras.style(i);
+                            solid = sh.is_solid(style);
+
+                            if(ras.sweep_scanline(sl_aa, i))
+                            {
+                                unsigned    cover;
+                                color_type* colors;
+                                color_type* cspan;
+                                cover_type* src_covers;
+                                cover_type* dst_covers;
+                                span_aa   = sl_aa.begin();
+                                num_spans = sl_aa.num_spans();
+                                sl_y      = sl_aa.y();
+                                if(solid)
+                                {
+                                    // Just solid fill
+                                    //-----------------------
+                                    for(;;)
+                                    {
+                                        color_type c = sh.color(style);
+                                        len    = span_aa->len;
+                                        colors = mix_buffer + span_aa->x - min_x;
+                                        src_covers = span_aa->covers;
+                                        dst_covers = cover_buffer + span_aa->x - min_x;
+                                        do
+                                        {
+                                            cover = *src_covers;
+                                            if(*dst_covers + cover > cover_full)
+                                            {
+                                                cover = cover_full - *dst_covers;
+                                            }
+                                            if(cover)
+                                            {
+                                                colors->add(c, cover);
+                                                *dst_covers += cover;
+                                            }
+                                            ++colors;
+                                            ++src_covers;
+                                            ++dst_covers;
+                                        }
+                                        while(--len);
+                                        if(--num_spans == 0) break;
+                                        ++span_aa;
+                                    }
+                                }
+                                else
+                                {
+                                    // Arbitrary span generator
+                                    //-----------------------
+                                    for(;;)
+                                    {
+                                        len = span_aa->len;
+                                        colors = mix_buffer + span_aa->x - min_x;
+                                        cspan  = color_span;
+                                        sh.generate_span(cspan, 
+                                                         span_aa->x, 
+                                                         sl_aa.y(), 
+                                                         len, 
+                                                         style);
+                                        src_covers = span_aa->covers;
+                                        dst_covers = cover_buffer + span_aa->x - min_x;
+                                        do
+                                        {
+                                            cover = *src_covers;
+                                            if(*dst_covers + cover > cover_full)
+                                            {
+                                                cover = cover_full - *dst_covers;
+                                            }
+                                            if(cover)
+                                            {
+                                                colors->add(*cspan, cover);
+                                                *dst_covers += cover;
+                                            }
+                                            ++cspan;
+                                            ++colors;
+                                            ++src_covers;
+                                            ++dst_covers;
+                                        }
+                                        while(--len);
+                                        if(--num_spans == 0) break;
+                                        ++span_aa;
+                                    }
+                                }
+                            }
+                        }
+                        ren.blend_color_hspan(sl_start, 
+                                              sl_y, 
+                                              sl_len,
+                                              mix_buffer + sl_start - min_x,
+                                              0,
+                                              cover_full);
+                    } //if(sl_len)
+                } //if(num_styles == 1) ... else
+            } //while((num_styles = ras.sweep_styles()) > 0)
+        } //if(ras.rewind_scanlines())
+    }
+
+
+}
+
+#endif

3rd/agg/include/agg_rendering_buffer.h

@@ -0,0 +1,300 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// class rendering_buffer
+//
+//----------------------------------------------------------------------------
+
+#ifndef AGG_RENDERING_BUFFER_INCLUDED
+#define AGG_RENDERING_BUFFER_INCLUDED
+
+#include "agg_array.h"
+
+namespace agg
+{
+
+    //===========================================================row_accessor
+    template<class T> class row_accessor
+    {
+    public:
+        typedef const_row_info<T> row_data;
+
+        //-------------------------------------------------------------------
+        row_accessor() :
+            m_buf(0),
+            m_start(0),
+            m_width(0),
+            m_height(0),
+            m_stride(0)
+        {
+        }
+
+        //--------------------------------------------------------------------
+        row_accessor(T* buf, unsigned width, unsigned height, int stride) :
+            m_buf(0),
+            m_start(0),
+            m_width(0),
+            m_height(0),
+            m_stride(0)
+        {
+            attach(buf, width, height, stride);
+        }
+
+
+        //--------------------------------------------------------------------
+        void attach(T* buf, unsigned width, unsigned height, int stride)
+        {
+            m_buf = m_start = buf;
+            m_width = width;
+            m_height = height;
+            m_stride = stride;
+            if(stride < 0) 
+            { 
+                m_start = m_buf - int(height - 1) * stride;
+            }
+        }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE       T* buf()          { return m_buf;    }
+        AGG_INLINE const T* buf()    const { return m_buf;    }
+        AGG_INLINE unsigned width()  const { return m_width;  }
+        AGG_INLINE unsigned height() const { return m_height; }
+        AGG_INLINE int      stride() const { return m_stride; }
+        AGG_INLINE unsigned stride_abs() const 
+        {
+            return (m_stride < 0) ? unsigned(-m_stride) : unsigned(m_stride); 
+        }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE       T* row_ptr(int, int y, unsigned) 
+        { 
+            return m_start + y * m_stride; 
+        }
+        AGG_INLINE       T* row_ptr(int y)       { return m_start + y * m_stride; }
+        AGG_INLINE const T* row_ptr(int y) const { return m_start + y * m_stride; }
+        AGG_INLINE row_data row    (int y) const 
+        { 
+            return row_data(0, m_width-1, row_ptr(y)); 
+        }
+
+        //--------------------------------------------------------------------
+        template<class RenBuf>
+        void copy_from(const RenBuf& src)
+        {
+            unsigned h = height();
+            if(src.height() < h) h = src.height();
+        
+            unsigned l = stride_abs();
+            if(src.stride_abs() < l) l = src.stride_abs();
+        
+            l *= sizeof(T);
+
+            unsigned y;
+            unsigned w = width();
+            for (y = 0; y < h; y++)
+            {
+                memcpy(row_ptr(0, y, w), src.row_ptr(y), l);
+            }
+        }
+
+        //--------------------------------------------------------------------
+        void clear(T value)
+        {
+            unsigned y;
+            unsigned w = width();
+            unsigned stride = stride_abs();
+            for(y = 0; y < height(); y++)
+            {
+                T* p = row_ptr(0, y, w);
+                unsigned x;
+                for(x = 0; x < stride; x++)
+                {
+                    *p++ = value;
+                }
+            }
+        }
+
+    private:
+        //--------------------------------------------------------------------
+        T*            m_buf;    // Pointer to renrdering buffer
+        T*            m_start;  // Pointer to first pixel depending on stride 
+        unsigned      m_width;  // Width in pixels
+        unsigned      m_height; // Height in pixels
+        int           m_stride; // Number of bytes per row. Can be < 0
+    };
+
+
+
+
+    //==========================================================row_ptr_cache
+    template<class T> class row_ptr_cache
+    {
+    public:
+        typedef const_row_info<T> row_data;
+
+        //-------------------------------------------------------------------
+        row_ptr_cache() :
+            m_buf(0),
+            m_rows(),
+            m_width(0),
+            m_height(0),
+            m_stride(0)
+        {
+        }
+
+        //--------------------------------------------------------------------
+        row_ptr_cache(T* buf, unsigned width, unsigned height, int stride) :
+            m_buf(0),
+            m_rows(),
+            m_width(0),
+            m_height(0),
+            m_stride(0)
+        {
+            attach(buf, width, height, stride);
+        }
+
+        //--------------------------------------------------------------------
+        void attach(T* buf, unsigned width, unsigned height, int stride)
+        {
+            m_buf = buf;
+            m_width = width;
+            m_height = height;
+            m_stride = stride;
+            if(height > m_rows.size())
+            {
+                m_rows.resize(height);
+            }
+
+            T* row_ptr = m_buf;
+
+            if(stride < 0)
+            {
+                row_ptr = m_buf - int(height - 1) * stride;
+            }
+
+            T** rows = &m_rows[0];
+
+            while(height--)
+            {
+                *rows++ = row_ptr;
+                row_ptr += stride;
+            }
+        }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE       T* buf()          { return m_buf;    }
+        AGG_INLINE const T* buf()    const { return m_buf;    }
+        AGG_INLINE unsigned width()  const { return m_width;  }
+        AGG_INLINE unsigned height() const { return m_height; }
+        AGG_INLINE int      stride() const { return m_stride; }
+        AGG_INLINE unsigned stride_abs() const 
+        {
+            return (m_stride < 0) ? unsigned(-m_stride) : unsigned(m_stride); 
+        }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE       T* row_ptr(int, int y, unsigned) 
+        { 
+            return m_rows[y]; 
+        }
+        AGG_INLINE       T* row_ptr(int y)       { return m_rows[y]; }
+        AGG_INLINE const T* row_ptr(int y) const { return m_rows[y]; }
+        AGG_INLINE row_data row    (int y) const 
+        { 
+            return row_data(0, m_width-1, m_rows[y]); 
+        }
+
+        //--------------------------------------------------------------------
+        T const* const* rows() const { return &m_rows[0]; }
+
+        //--------------------------------------------------------------------
+        template<class RenBuf>
+        void copy_from(const RenBuf& src)
+        {
+            unsigned h = height();
+            if(src.height() < h) h = src.height();
+        
+            unsigned l = stride_abs();
+            if(src.stride_abs() < l) l = src.stride_abs();
+        
+            l *= sizeof(T);
+
+            unsigned y;
+            unsigned w = width();
+            for (y = 0; y < h; y++)
+            {
+                memcpy(row_ptr(0, y, w), src.row_ptr(y), l);
+            }
+        }
+
+        //--------------------------------------------------------------------
+        void clear(T value)
+        {
+            unsigned y;
+            unsigned w = width();
+            unsigned stride = stride_abs();
+            for(y = 0; y < height(); y++)
+            {
+                T* p = row_ptr(0, y, w);
+                unsigned x;
+                for(x = 0; x < stride; x++)
+                {
+                    *p++ = value;
+                }
+            }
+        }
+
+    private:
+        //--------------------------------------------------------------------
+        T*            m_buf;        // Pointer to renrdering buffer
+        pod_array<T*> m_rows;       // Pointers to each row of the buffer
+        unsigned      m_width;      // Width in pixels
+        unsigned      m_height;     // Height in pixels
+        int           m_stride;     // Number of bytes per row. Can be < 0
+    };
+
+
+
+
+    //========================================================rendering_buffer
+    // 
+    // The definition of the main type for accessing the rows in the frame 
+    // buffer. It provides functionality to navigate to the rows in a 
+    // rectangular matrix, from top to bottom or from bottom to top depending 
+    // on stride.
+    //
+    // row_accessor is cheap to create/destroy, but performs one multiplication
+    // when calling row_ptr().
+    // 
+    // row_ptr_cache creates an array of pointers to rows, so, the access 
+    // via row_ptr() may be faster. But it requires memory allocation 
+    // when creating. For example, on typical Intel Pentium hardware 
+    // row_ptr_cache speeds span_image_filter_rgb_nn up to 10%
+    //
+    // It's used only in short hand typedefs like pixfmt_rgba32 and can be 
+    // redefined in agg_config.h
+    // In real applications you can use both, depending on your needs
+    //------------------------------------------------------------------------
+#ifdef AGG_RENDERING_BUFFER
+    typedef AGG_RENDERING_BUFFER rendering_buffer;
+#else
+//  typedef row_ptr_cache<int8u> rendering_buffer;
+    typedef row_accessor<int8u> rendering_buffer;
+#endif
+
+}
+
+
+#endif

3rd/agg/include/agg_scanline_u.h

@@ -0,0 +1,499 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// Adaptation for 32-bit screen coordinates (scanline32_u) has been sponsored by 
+// Liberty Technology Systems, Inc., visit http://lib-sys.com
+//
+// Liberty Technology Systems, Inc. is the provider of
+// PostScript and PDF technology for software developers.
+// 
+//----------------------------------------------------------------------------
+
+#ifndef AGG_SCANLINE_U_INCLUDED
+#define AGG_SCANLINE_U_INCLUDED
+
+#include "agg_array.h"
+
+namespace agg
+{
+    //=============================================================scanline_u8
+    //
+    // Unpacked scanline container class
+    //
+    // This class is used to transfer data from a scanline rasterizer 
+    // to the rendering buffer. It's organized very simple. The class stores 
+    // information of horizontal spans to render it into a pixel-map buffer. 
+    // Each span has staring X, length, and an array of bytes that determine the 
+    // cover-values for each pixel. 
+    // Before using this class you should know the minimal and maximal pixel 
+    // coordinates of your scanline. The protocol of using is:
+    // 1. reset(min_x, max_x)
+    // 2. add_cell() / add_span() - accumulate scanline. 
+    //    When forming one scanline the next X coordinate must be always greater
+    //    than the last stored one, i.e. it works only with ordered coordinates.
+    // 3. Call finalize(y) and render the scanline.
+    // 3. Call reset_spans() to prepare for the new scanline.
+    //    
+    // 4. Rendering:
+    // 
+    // Scanline provides an iterator class that allows you to extract
+    // the spans and the cover values for each pixel. Be aware that clipping
+    // has not been done yet, so you should perform it yourself.
+    // Use scanline_u8::iterator to render spans:
+    //-------------------------------------------------------------------------
+    //
+    // int y = sl.y();                    // Y-coordinate of the scanline
+    //
+    // ************************************
+    // ...Perform vertical clipping here...
+    // ************************************
+    //
+    // scanline_u8::const_iterator span = sl.begin();
+    // 
+    // unsigned char* row = m_rbuf->row(y); // The the address of the beginning 
+    //                                      // of the current row
+    // 
+    // unsigned num_spans = sl.num_spans(); // Number of spans. It's guaranteed that
+    //                                      // num_spans is always greater than 0.
+    //
+    // do
+    // {
+    //     const scanline_u8::cover_type* covers =
+    //         span->covers;                     // The array of the cover values
+    //
+    //     int num_pix = span->len;              // Number of pixels of the span.
+    //                                           // Always greater than 0, still it's
+    //                                           // better to use "int" instead of 
+    //                                           // "unsigned" because it's more
+    //                                           // convenient for clipping
+    //     int x = span->x;
+    //
+    //     **************************************
+    //     ...Perform horizontal clipping here...
+    //     ...you have x, covers, and pix_count..
+    //     **************************************
+    //
+    //     unsigned char* dst = row + x;  // Calculate the start address of the row.
+    //                                    // In this case we assume a simple 
+    //                                    // grayscale image 1-byte per pixel.
+    //     do
+    //     {
+    //         *dst++ = *covers++;        // Hypotetical rendering. 
+    //     }
+    //     while(--num_pix);
+    //
+    //     ++span;
+    // } 
+    // while(--num_spans);  // num_spans cannot be 0, so this loop is quite safe
+    //------------------------------------------------------------------------
+    //
+    // The question is: why should we accumulate the whole scanline when we
+    // could render just separate spans when they're ready?
+    // That's because using the scanline is generally faster. When is consists 
+    // of more than one span the conditions for the processor cash system
+    // are better, because switching between two different areas of memory 
+    // (that can be very large) occurs less frequently.
+    //------------------------------------------------------------------------
+    class scanline_u8
+    {
+    public:
+        typedef scanline_u8 self_type;
+        typedef int8u       cover_type;
+        typedef int16       coord_type;
+
+        //--------------------------------------------------------------------
+        struct span
+        {
+            coord_type  x;
+            coord_type  len;
+            cover_type* covers;
+        };
+
+        typedef span* iterator;
+        typedef const span* const_iterator;
+
+        //--------------------------------------------------------------------
+        scanline_u8() :
+            m_min_x(0),
+            m_last_x(0x7FFFFFF0),
+            m_cur_span(0)
+        {}
+
+        //--------------------------------------------------------------------
+        void reset(int min_x, int max_x)
+        {
+            unsigned max_len = max_x - min_x + 2;
+            if(max_len > m_spans.size())
+            {
+                m_spans.resize(max_len);
+                m_covers.resize(max_len);
+            }
+            m_last_x   = 0x7FFFFFF0;
+            m_min_x    = min_x;
+            m_cur_span = &m_spans[0];
+        }
+
+        //--------------------------------------------------------------------
+        void add_cell(int x, unsigned cover)
+        {
+            x -= m_min_x;
+            m_covers[x] = (cover_type)cover;
+            if(x == m_last_x+1)
+            {
+                m_cur_span->len++;
+            }
+            else
+            {
+                m_cur_span++;
+                m_cur_span->x      = (coord_type)(x + m_min_x);
+                m_cur_span->len    = 1;
+                m_cur_span->covers = &m_covers[x];
+            }
+            m_last_x = x;
+        }
+
+        //--------------------------------------------------------------------
+        void add_cells(int x, unsigned len, const cover_type* covers)
+        {
+            x -= m_min_x;
+            memcpy(&m_covers[x], covers, len * sizeof(cover_type));
+            if(x == m_last_x+1)
+            {
+                m_cur_span->len += (coord_type)len;
+            }
+            else
+            {
+                m_cur_span++;
+                m_cur_span->x      = (coord_type)(x + m_min_x);
+                m_cur_span->len    = (coord_type)len;
+                m_cur_span->covers = &m_covers[x];
+            }
+            m_last_x = x + len - 1;
+        }
+
+        //--------------------------------------------------------------------
+        void add_span(int x, unsigned len, unsigned cover)
+        {
+            x -= m_min_x;
+            memset(&m_covers[x], cover, len);
+            if(x == m_last_x+1)
+            {
+                m_cur_span->len += (coord_type)len;
+            }
+            else
+            {
+                m_cur_span++;
+                m_cur_span->x      = (coord_type)(x + m_min_x);
+                m_cur_span->len    = (coord_type)len;
+                m_cur_span->covers = &m_covers[x];
+            }
+            m_last_x = x + len - 1;
+        }
+
+        //--------------------------------------------------------------------
+        void finalize(int y) 
+        { 
+            m_y = y; 
+        }
+
+        //--------------------------------------------------------------------
+        void reset_spans()
+        {
+            m_last_x    = 0x7FFFFFF0;
+            m_cur_span  = &m_spans[0];
+        }
+
+        //--------------------------------------------------------------------
+        int      y()           const { return m_y; }
+        unsigned num_spans()   const { return unsigned(m_cur_span - &m_spans[0]); }
+        const_iterator begin() const { return &m_spans[1]; }
+        iterator       begin()       { return &m_spans[1]; }
+
+    private:
+        scanline_u8(const self_type&);
+        const self_type& operator = (const self_type&);
+
+    private:
+        int                   m_min_x;
+        int                   m_last_x;
+        int                   m_y;
+        pod_array<cover_type> m_covers;
+        pod_array<span>       m_spans;
+        span*                 m_cur_span;
+    };
+
+
+
+
+    //==========================================================scanline_u8_am
+    // 
+    // The scanline container with alpha-masking
+    // 
+    //------------------------------------------------------------------------
+    template<class AlphaMask> 
+    class scanline_u8_am : public scanline_u8
+    {
+    public:
+        typedef scanline_u8           base_type;
+        typedef AlphaMask             alpha_mask_type;
+        typedef base_type::cover_type cover_type;
+        typedef base_type::coord_type coord_type;
+
+        scanline_u8_am() : base_type(), m_alpha_mask(0) {}
+        scanline_u8_am(AlphaMask& am) : base_type(), m_alpha_mask(&am) {}
+
+        //--------------------------------------------------------------------
+        void finalize(int span_y)
+        {
+            base_type::finalize(span_y);
+            if(m_alpha_mask)
+            {
+                typename base_type::iterator span = base_type::begin();
+                unsigned count = base_type::num_spans();
+                do
+                {
+                    m_alpha_mask->combine_hspan(span->x, 
+                                                base_type::y(), 
+                                                span->covers, 
+                                                span->len);
+                    ++span;
+                }
+                while(--count);
+            }
+        }
+
+    private:
+        AlphaMask* m_alpha_mask;
+    };
+
+
+
+
+    //===========================================================scanline32_u8
+    class scanline32_u8
+    {
+    public:
+        typedef scanline32_u8 self_type;
+        typedef int8u         cover_type;
+        typedef int32         coord_type;
+
+        //--------------------------------------------------------------------
+        struct span
+        {
+            span() {}
+            span(coord_type x_, coord_type len_, cover_type* covers_) :
+                x(x_), len(len_), covers(covers_) {}
+
+            coord_type  x;
+            coord_type  len;
+            cover_type* covers;
+        };
+
+        typedef pod_bvector<span, 4> span_array_type;
+
+        //--------------------------------------------------------------------
+        class const_iterator
+        {
+        public:
+            const_iterator(const span_array_type& spans) :
+                m_spans(spans),
+                m_span_idx(0)
+            {}
+
+            const span& operator*()  const { return m_spans[m_span_idx];  }
+            const span* operator->() const { return &m_spans[m_span_idx]; }
+
+            void operator ++ () { ++m_span_idx; }
+
+        private:
+            const span_array_type& m_spans;
+            unsigned               m_span_idx;
+        };
+
+        //--------------------------------------------------------------------
+        class iterator
+        {
+        public:
+            iterator(span_array_type& spans) :
+                m_spans(spans),
+                m_span_idx(0)
+            {}
+
+            span& operator*()  { return m_spans[m_span_idx];  }
+            span* operator->() { return &m_spans[m_span_idx]; }
+
+            void operator ++ () { ++m_span_idx; }
+
+        private:
+            span_array_type& m_spans;
+            unsigned         m_span_idx;
+        };
+
+
+
+        //--------------------------------------------------------------------
+        scanline32_u8() :
+            m_min_x(0),
+            m_last_x(0x7FFFFFF0),
+            m_covers()
+        {}
+
+        //--------------------------------------------------------------------
+        void reset(int min_x, int max_x)
+        {
+            unsigned max_len = max_x - min_x + 2;
+            if(max_len > m_covers.size())
+            {
+                m_covers.resize(max_len);
+            }
+            m_last_x = 0x7FFFFFF0;
+            m_min_x  = min_x;
+            m_spans.remove_all();
+        }
+
+        //--------------------------------------------------------------------
+        void add_cell(int x, unsigned cover)
+        {
+            x -= m_min_x;
+            m_covers[x] = cover_type(cover);
+            if(x == m_last_x+1)
+            {
+                m_spans.last().len++;
+            }
+            else
+            {
+                m_spans.add(span(coord_type(x + m_min_x), 1, &m_covers[x]));
+            }
+            m_last_x = x;
+        }
+
+        //--------------------------------------------------------------------
+        void add_cells(int x, unsigned len, const cover_type* covers)
+        {
+            x -= m_min_x;
+            memcpy(&m_covers[x], covers, len * sizeof(cover_type));
+            if(x == m_last_x+1)
+            {
+                m_spans.last().len += coord_type(len);
+            }
+            else
+            {
+                m_spans.add(span(coord_type(x + m_min_x), 
+                                 coord_type(len), 
+                                 &m_covers[x]));
+            }
+            m_last_x = x + len - 1;
+        }
+
+        //--------------------------------------------------------------------
+        void add_span(int x, unsigned len, unsigned cover)
+        {
+            x -= m_min_x;
+            memset(&m_covers[x], cover, len);
+            if(x == m_last_x+1)
+            {
+                m_spans.last().len += coord_type(len);
+            }
+            else
+            {
+                m_spans.add(span(coord_type(x + m_min_x), 
+                                 coord_type(len), 
+                                 &m_covers[x]));
+            }
+            m_last_x = x + len - 1;
+        }
+
+        //--------------------------------------------------------------------
+        void finalize(int y) 
+        { 
+            m_y = y; 
+        }
+
+        //--------------------------------------------------------------------
+        void reset_spans()
+        {
+            m_last_x = 0x7FFFFFF0;
+            m_spans.remove_all();
+        }
+
+        //--------------------------------------------------------------------
+        int      y()           const { return m_y; }
+        unsigned num_spans()   const { return m_spans.size(); }
+        const_iterator begin() const { return const_iterator(m_spans); }
+        iterator       begin()       { return iterator(m_spans); }
+
+    private:
+        scanline32_u8(const self_type&);
+        const self_type& operator = (const self_type&);
+
+    private:
+        int                   m_min_x;
+        int                   m_last_x;
+        int                   m_y;
+        pod_array<cover_type> m_covers;
+        span_array_type       m_spans;
+    };
+
+
+
+
+    //========================================================scanline32_u8_am
+    // 
+    // The scanline container with alpha-masking
+    // 
+    //------------------------------------------------------------------------
+    template<class AlphaMask> 
+    class scanline32_u8_am : public scanline32_u8
+    {
+    public:
+        typedef scanline32_u8         base_type;
+        typedef AlphaMask             alpha_mask_type;
+        typedef base_type::cover_type cover_type;
+        typedef base_type::coord_type coord_type;
+
+
+        scanline32_u8_am() : base_type(), m_alpha_mask(0) {}
+        scanline32_u8_am(AlphaMask& am) : base_type(), m_alpha_mask(&am) {}
+
+        //--------------------------------------------------------------------
+        void finalize(int span_y)
+        {
+            base_type::finalize(span_y);
+            if(m_alpha_mask)
+            {
+                typename base_type::iterator span = base_type::begin();
+                unsigned count = base_type::num_spans();
+                do
+                {
+                    m_alpha_mask->combine_hspan(span->x, 
+                                                base_type::y(), 
+                                                span->covers, 
+                                                span->len);
+                    ++span;
+                }
+                while(--count);
+            }
+        }
+
+    private:
+        AlphaMask* m_alpha_mask;
+    };
+
+
+
+}
+
+#endif
+

3rd/agg/include/agg_shorten_path.h

@@ -0,0 +1,66 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+
+#ifndef AGG_SHORTEN_PATH_INCLUDED
+#define AGG_SHORTEN_PATH_INCLUDED
+
+#include "agg_basics.h"
+#include "agg_vertex_sequence.h"
+
+namespace agg
+{
+
+    //===========================================================shorten_path
+    template<class VertexSequence> 
+    void shorten_path(VertexSequence& vs, double s, unsigned closed = 0)
+    {
+        typedef typename VertexSequence::value_type vertex_type;
+
+        if(s > 0.0 && vs.size() > 1)
+        {
+            double d;
+            int n = int(vs.size() - 2);
+            while(n)
+            {
+                d = vs[n].dist;
+                if(d > s) break;
+                vs.remove_last();
+                s -= d;
+                --n;
+            }
+            if(vs.size() < 2)
+            {
+                vs.remove_all();
+            }
+            else
+            {
+                n = vs.size() - 1;
+                vertex_type& prev = vs[n-1];
+                vertex_type& last = vs[n];
+                d = (prev.dist - s) / prev.dist;
+                double x = prev.x + (last.x - prev.x) * d;
+                double y = prev.y + (last.y - prev.y) * d;
+                last.x = x;
+                last.y = y;
+                if(!prev(last)) vs.remove_last();
+                vs.close(closed != 0);
+            }
+        }
+    }
+
+
+}
+
+#endif

3rd/agg/include/agg_span_allocator.h

@@ -0,0 +1,54 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+
+#ifndef AGG_SPAN_ALLOCATOR_INCLUDED
+#define AGG_SPAN_ALLOCATOR_INCLUDED
+
+#include "agg_array.h"
+
+namespace agg
+{
+    //----------------------------------------------------------span_allocator
+    template<class ColorT> class span_allocator
+    {
+    public:
+        typedef ColorT color_type;
+
+        //--------------------------------------------------------------------
+        AGG_INLINE color_type* allocate(unsigned span_len)
+        {
+            if(span_len > m_span.size())
+            {
+                // To reduce the number of reallocs we align the 
+                // span_len to 256 color elements. 
+                // Well, I just like this number and it looks reasonable.
+                //-----------------------
+                m_span.resize(((span_len + 255) >> 8) << 8);
+            }
+            return &m_span[0];
+        }
+
+        AGG_INLINE color_type* span()               { return &m_span[0]; }
+        AGG_INLINE unsigned    max_span_len() const { return m_span.size(); }
+
+    private:
+        pod_array<color_type> m_span;
+    };
+}
+
+
+#endif
+
+

3rd/agg/include/agg_span_image_filter.h

@@ -0,0 +1,246 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// Image transformations with filtering. Span generator base class
+//
+//----------------------------------------------------------------------------
+#ifndef AGG_SPAN_IMAGE_FILTER_INCLUDED
+#define AGG_SPAN_IMAGE_FILTER_INCLUDED
+
+#include "agg_basics.h"
+#include "agg_image_filters.h"
+#include "agg_span_interpolator_linear.h"
+
+namespace agg
+{
+
+    //-------------------------------------------------------span_image_filter
+    template<class Source, class Interpolator> class span_image_filter
+    {
+    public:
+        typedef Source source_type;
+        typedef Interpolator interpolator_type;
+
+        //--------------------------------------------------------------------
+        span_image_filter() {}
+        span_image_filter(source_type& src, 
+                          interpolator_type& interpolator,
+                          image_filter_lut* filter) : 
+            m_src(&src),
+            m_interpolator(&interpolator),
+            m_filter(filter),
+            m_dx_dbl(0.5),
+            m_dy_dbl(0.5),
+            m_dx_int(image_subpixel_scale / 2),
+            m_dy_int(image_subpixel_scale / 2)
+        {}
+        void attach(source_type& v) { m_src = &v; }
+
+        //--------------------------------------------------------------------
+               source_type& source()            { return *m_src; }
+        const  source_type& source()      const { return *m_src; }
+        const  image_filter_lut& filter() const { return *m_filter; }
+        int    filter_dx_int()            const { return m_dx_int; }
+        int    filter_dy_int()            const { return m_dy_int; }
+        double filter_dx_dbl()            const { return m_dx_dbl; }
+        double filter_dy_dbl()            const { return m_dy_dbl; }
+
+        //--------------------------------------------------------------------
+        void interpolator(interpolator_type& v)  { m_interpolator = &v; }
+        void filter(image_filter_lut& v)         { m_filter = &v; }
+        void filter_offset(double dx, double dy)
+        {
+            m_dx_dbl = dx;
+            m_dy_dbl = dy;
+            m_dx_int = iround(dx * image_subpixel_scale);
+            m_dy_int = iround(dy * image_subpixel_scale);
+        }
+        void filter_offset(double d) { filter_offset(d, d); }
+
+        //--------------------------------------------------------------------
+        interpolator_type& interpolator() { return *m_interpolator; }
+
+        //--------------------------------------------------------------------
+        void prepare() {}
+
+        //--------------------------------------------------------------------
+    private:
+        source_type*            m_src;
+        interpolator_type*      m_interpolator;
+        image_filter_lut*       m_filter;
+        double   m_dx_dbl;
+        double   m_dy_dbl;
+        unsigned m_dx_int;
+        unsigned m_dy_int;
+    };
+
+
+
+
+    //==============================================span_image_resample_affine
+    template<class Source> 
+    class span_image_resample_affine : 
+    public span_image_filter<Source, span_interpolator_linear<trans_affine> >
+    {
+    public:
+        typedef Source source_type;
+        typedef span_interpolator_linear<trans_affine> interpolator_type;
+        typedef span_image_filter<source_type, interpolator_type> base_type;
+
+        //--------------------------------------------------------------------
+        span_image_resample_affine() : 
+            m_scale_limit(200.0),
+            m_blur_x(1.0),
+            m_blur_y(1.0)
+        {}
+
+        //--------------------------------------------------------------------
+        span_image_resample_affine(source_type& src, 
+                                   interpolator_type& inter,
+                                   image_filter_lut& filter) :
+            base_type(src, inter, &filter),
+            m_scale_limit(200.0),
+            m_blur_x(1.0),
+            m_blur_y(1.0)
+        {}
+
+
+        //--------------------------------------------------------------------
+        int  scale_limit() const { return uround(m_scale_limit); }
+        void scale_limit(int v)  { m_scale_limit = v; }
+
+        //--------------------------------------------------------------------
+        double blur_x() const { return m_blur_x; }
+        double blur_y() const { return m_blur_y; }
+        void blur_x(double v) { m_blur_x = v; }
+        void blur_y(double v) { m_blur_y = v; }
+        void blur(double v) { m_blur_x = m_blur_y = v; }
+
+        //--------------------------------------------------------------------
+        void prepare() 
+        {
+            double scale_x;
+            double scale_y;
+
+            base_type::interpolator().transformer().scaling_abs(&scale_x, &scale_y);
+
+            if(scale_x * scale_y > m_scale_limit)
+            {
+                scale_x = scale_x * m_scale_limit / (scale_x * scale_y);
+                scale_y = scale_y * m_scale_limit / (scale_x * scale_y);
+            }
+
+            if(scale_x < 1) scale_x = 1;
+            if(scale_y < 1) scale_y = 1;
+
+            if(scale_x > m_scale_limit) scale_x = m_scale_limit;
+            if(scale_y > m_scale_limit) scale_y = m_scale_limit;
+
+            scale_x *= m_blur_x;
+            scale_y *= m_blur_y;
+
+            if(scale_x < 1) scale_x = 1;
+            if(scale_y < 1) scale_y = 1;
+
+            m_rx     = uround(    scale_x * double(image_subpixel_scale));
+            m_rx_inv = uround(1.0/scale_x * double(image_subpixel_scale));
+
+            m_ry     = uround(    scale_y * double(image_subpixel_scale));
+            m_ry_inv = uround(1.0/scale_y * double(image_subpixel_scale));
+        }
+
+    protected:
+        int m_rx;
+        int m_ry;
+        int m_rx_inv;
+        int m_ry_inv;
+
+    private:
+        double m_scale_limit;
+        double m_blur_x;
+        double m_blur_y;
+    };
+
+
+
+    //=====================================================span_image_resample
+    template<class Source, class Interpolator> 
+    class span_image_resample : 
+    public span_image_filter<Source, Interpolator>
+    {
+    public:
+        typedef Source source_type;
+        typedef Interpolator interpolator_type;
+        typedef span_image_filter<source_type, interpolator_type> base_type;
+
+        //--------------------------------------------------------------------
+        span_image_resample() : 
+            m_scale_limit(20),
+            m_blur_x(image_subpixel_scale),
+            m_blur_y(image_subpixel_scale)
+        {}
+
+        //--------------------------------------------------------------------
+        span_image_resample(source_type& src, 
+                            interpolator_type& inter,
+                            image_filter_lut& filter) :
+            base_type(src, inter, &filter),
+            m_scale_limit(20),
+            m_blur_x(image_subpixel_scale),
+            m_blur_y(image_subpixel_scale)
+        {}
+
+        //--------------------------------------------------------------------
+        int  scale_limit() const { return m_scale_limit; }
+        void scale_limit(int v)  { m_scale_limit = v; }
+
+        //--------------------------------------------------------------------
+        double blur_x() const { return double(m_blur_x) / double(image_subpixel_scale); }
+        double blur_y() const { return double(m_blur_y) / double(image_subpixel_scale); }
+        void blur_x(double v) { m_blur_x = uround(v * double(image_subpixel_scale)); }
+        void blur_y(double v) { m_blur_y = uround(v * double(image_subpixel_scale)); }
+        void blur(double v)   { m_blur_x = 
+                                m_blur_y = uround(v * double(image_subpixel_scale)); }
+
+    protected:
+        AGG_INLINE void adjust_scale(int* rx, int* ry)
+        {
+            if(*rx < image_subpixel_scale) *rx = image_subpixel_scale;
+            if(*ry < image_subpixel_scale) *ry = image_subpixel_scale;
+            if(*rx > image_subpixel_scale * m_scale_limit) 
+            {
+                *rx = image_subpixel_scale * m_scale_limit;
+            }
+            if(*ry > image_subpixel_scale * m_scale_limit) 
+            {
+                *ry = image_subpixel_scale * m_scale_limit;
+            }
+            *rx = (*rx * m_blur_x) >> image_subpixel_shift;
+            *ry = (*ry * m_blur_y) >> image_subpixel_shift;
+            if(*rx < image_subpixel_scale) *rx = image_subpixel_scale;
+            if(*ry < image_subpixel_scale) *ry = image_subpixel_scale;
+        }
+
+        int m_scale_limit;
+        int m_blur_x;
+        int m_blur_y;
+    };
+
+
+
+
+}
+
+#endif

3rd/agg/include/agg_span_image_filter_rgb.h

@@ -0,0 +1,861 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// Adaptation for high precision colors has been sponsored by 
+// Liberty Technology Systems, Inc., visit http://lib-sys.com
+//
+// Liberty Technology Systems, Inc. is the provider of
+// PostScript and PDF technology for software developers.
+// 
+//----------------------------------------------------------------------------
+#ifndef AGG_SPAN_IMAGE_FILTER_RGB_INCLUDED
+#define AGG_SPAN_IMAGE_FILTER_RGB_INCLUDED
+
+#include "agg_basics.h"
+#include "agg_color_rgba.h"
+#include "agg_span_image_filter.h"
+
+
+namespace agg
+{
+
+    //===============================================span_image_filter_rgb_nn
+    template<class Source, class Interpolator> 
+    class span_image_filter_rgb_nn : 
+    public span_image_filter<Source, Interpolator>
+    {
+    public:
+        typedef Source source_type;
+        typedef typename source_type::color_type color_type;
+        typedef typename source_type::order_type order_type;
+        typedef Interpolator interpolator_type;
+        typedef span_image_filter<source_type, interpolator_type> base_type;
+        typedef typename color_type::value_type value_type;
+        typedef typename color_type::calc_type calc_type;
+        typedef typename color_type::long_type long_type;
+
+        //--------------------------------------------------------------------
+        span_image_filter_rgb_nn() {}
+        span_image_filter_rgb_nn(source_type& src, 
+                                 interpolator_type& inter) :
+            base_type(src, inter, 0) 
+        {}
+
+        //--------------------------------------------------------------------
+        void generate(color_type* span, int x, int y, unsigned len)
+        {
+            base_type::interpolator().begin(x + base_type::filter_dx_dbl(), 
+                                            y + base_type::filter_dy_dbl(), len);
+            do
+            {
+                base_type::interpolator().coordinates(&x, &y);
+                const value_type* fg_ptr = (const value_type*)
+                    base_type::source().span(x >> image_subpixel_shift, 
+                                             y >> image_subpixel_shift, 
+                                             1);
+                span->r = fg_ptr[order_type::R];
+                span->g = fg_ptr[order_type::G];
+                span->b = fg_ptr[order_type::B];
+                span->a = color_type::full_value();
+                ++span;
+                ++base_type::interpolator();
+
+            } while(--len);
+        }
+    };
+
+
+
+    //==========================================span_image_filter_rgb_bilinear
+    template<class Source, class Interpolator> 
+    class span_image_filter_rgb_bilinear : 
+    public span_image_filter<Source, Interpolator>
+    {
+    public:
+        typedef Source source_type;
+        typedef typename source_type::color_type color_type;
+        typedef typename source_type::order_type order_type;
+        typedef Interpolator interpolator_type;
+        typedef span_image_filter<source_type, interpolator_type> base_type;
+        typedef typename color_type::value_type value_type;
+        typedef typename color_type::calc_type calc_type;
+        typedef typename color_type::long_type long_type;
+
+        //--------------------------------------------------------------------
+        span_image_filter_rgb_bilinear() {}
+        span_image_filter_rgb_bilinear(source_type& src, 
+                                       interpolator_type& inter) :
+            base_type(src, inter, 0) 
+        {}
+
+
+        //--------------------------------------------------------------------
+        void generate(color_type* span, int x, int y, unsigned len)
+        {
+            base_type::interpolator().begin(x + base_type::filter_dx_dbl(), 
+                                            y + base_type::filter_dy_dbl(), len);
+            long_type fg[3];
+            const value_type *fg_ptr;
+            do
+            {
+                int x_hr;
+                int y_hr;
+
+                base_type::interpolator().coordinates(&x_hr, &y_hr);
+
+                x_hr -= base_type::filter_dx_int();
+                y_hr -= base_type::filter_dy_int();
+
+                int x_lr = x_hr >> image_subpixel_shift;
+                int y_lr = y_hr >> image_subpixel_shift;
+
+                unsigned weight;
+
+                fg[0] = fg[1] = fg[2] = 0;
+
+                x_hr &= image_subpixel_mask;
+                y_hr &= image_subpixel_mask;
+
+                fg_ptr = (const value_type*)base_type::source().span(x_lr, y_lr, 2);
+                weight = (image_subpixel_scale - x_hr) * 
+                         (image_subpixel_scale - y_hr);
+                fg[0] += weight * *fg_ptr++;
+                fg[1] += weight * *fg_ptr++;
+                fg[2] += weight * *fg_ptr;
+
+                fg_ptr = (const value_type*)base_type::source().next_x();
+                weight = x_hr * (image_subpixel_scale - y_hr);
+                fg[0] += weight * *fg_ptr++;
+                fg[1] += weight * *fg_ptr++;
+                fg[2] += weight * *fg_ptr;
+
+                fg_ptr = (const value_type*)base_type::source().next_y();
+                weight = (image_subpixel_scale - x_hr) * y_hr;
+                fg[0] += weight * *fg_ptr++;
+                fg[1] += weight * *fg_ptr++;
+                fg[2] += weight * *fg_ptr;
+
+                fg_ptr = (const value_type*)base_type::source().next_x();
+                weight = x_hr * y_hr;
+                fg[0] += weight * *fg_ptr++;
+                fg[1] += weight * *fg_ptr++;
+                fg[2] += weight * *fg_ptr;
+
+                span->r = color_type::downshift(fg[order_type::R], image_subpixel_shift * 2);
+                span->g = color_type::downshift(fg[order_type::G], image_subpixel_shift * 2);
+                span->b = color_type::downshift(fg[order_type::B], image_subpixel_shift * 2);
+                span->a = color_type::full_value();
+
+                ++span;
+                ++base_type::interpolator();
+
+            } while(--len);
+        }
+    };
+
+
+
+    //=====================================span_image_filter_rgb_bilinear_clip
+    template<class Source, class Interpolator> 
+    class span_image_filter_rgb_bilinear_clip : 
+    public span_image_filter<Source, Interpolator>
+    {
+    public:
+        typedef Source source_type;
+        typedef typename source_type::color_type color_type;
+        typedef typename source_type::order_type order_type;
+        typedef Interpolator interpolator_type;
+        typedef span_image_filter<source_type, interpolator_type> base_type;
+        typedef typename color_type::value_type value_type;
+        typedef typename color_type::calc_type calc_type;
+        typedef typename color_type::long_type long_type;
+
+        //--------------------------------------------------------------------
+        span_image_filter_rgb_bilinear_clip() {}
+        span_image_filter_rgb_bilinear_clip(source_type& src, 
+                                            const color_type& back_color,
+                                            interpolator_type& inter) :
+            base_type(src, inter, 0),
+            m_back_color(back_color)
+        {}
+        const color_type& background_color() const { return m_back_color; }
+        void background_color(const color_type& v)   { m_back_color = v; }
+
+        //--------------------------------------------------------------------
+        void generate(color_type* span, int x, int y, unsigned len)
+        {
+            base_type::interpolator().begin(x + base_type::filter_dx_dbl(), 
+                                            y + base_type::filter_dy_dbl(), len);
+            long_type fg[3];
+            long_type src_alpha;
+            value_type back_r = m_back_color.r;
+            value_type back_g = m_back_color.g;
+            value_type back_b = m_back_color.b;
+            value_type back_a = m_back_color.a;
+
+            const value_type *fg_ptr;
+
+            int maxx = base_type::source().width() - 1;
+            int maxy = base_type::source().height() - 1;
+
+            do
+            {
+                int x_hr;
+                int y_hr;
+                
+                base_type::interpolator().coordinates(&x_hr, &y_hr);
+
+                x_hr -= base_type::filter_dx_int();
+                y_hr -= base_type::filter_dy_int();
+
+                int x_lr = x_hr >> image_subpixel_shift;
+                int y_lr = y_hr >> image_subpixel_shift;
+                unsigned weight;
+
+                if(x_lr >= 0    && y_lr >= 0 &&
+                   x_lr <  maxx && y_lr <  maxy) 
+                {
+                    fg[0] = fg[1] = fg[2] = 0;
+
+                    x_hr &= image_subpixel_mask;
+                    y_hr &= image_subpixel_mask;
+
+                    fg_ptr = (const value_type*)
+                        base_type::source().row_ptr(y_lr) + x_lr + x_lr + x_lr;
+
+                    weight = (image_subpixel_scale - x_hr) * 
+                             (image_subpixel_scale - y_hr);
+                    fg[0] += weight * *fg_ptr++;
+                    fg[1] += weight * *fg_ptr++;
+                    fg[2] += weight * *fg_ptr++;
+
+                    weight = x_hr * (image_subpixel_scale - y_hr);
+                    fg[0] += weight * *fg_ptr++;
+                    fg[1] += weight * *fg_ptr++;
+                    fg[2] += weight * *fg_ptr++;
+
+                    ++y_lr;
+                    fg_ptr = (const value_type*)
+                        base_type::source().row_ptr(y_lr) + x_lr + x_lr + x_lr;
+
+                    weight = (image_subpixel_scale - x_hr) * y_hr;
+                    fg[0] += weight * *fg_ptr++;
+                    fg[1] += weight * *fg_ptr++;
+                    fg[2] += weight * *fg_ptr++;
+
+                    weight = x_hr * y_hr;
+                    fg[0] += weight * *fg_ptr++;
+                    fg[1] += weight * *fg_ptr++;
+                    fg[2] += weight * *fg_ptr++;
+
+                    fg[0] = color_type::downshift(fg[0], image_subpixel_shift * 2);
+                    fg[1] = color_type::downshift(fg[1], image_subpixel_shift * 2);
+                    fg[2] = color_type::downshift(fg[2], image_subpixel_shift * 2);
+                    src_alpha = color_type::full_value();
+                }
+                else
+                {
+                    if(x_lr < -1   || y_lr < -1 ||
+                       x_lr > maxx || y_lr > maxy)
+                    {
+                        fg[order_type::R] = back_r;
+                        fg[order_type::G] = back_g;
+                        fg[order_type::B] = back_b;
+                        src_alpha         = back_a;
+                    }
+                    else
+                    {
+                        fg[0] = fg[1] = fg[2] = src_alpha = 0;
+
+                        x_hr &= image_subpixel_mask;
+                        y_hr &= image_subpixel_mask;
+
+                        weight = (image_subpixel_scale - x_hr) * 
+                                 (image_subpixel_scale - y_hr);
+                        if(x_lr >= 0    && y_lr >= 0 &&
+                           x_lr <= maxx && y_lr <= maxy)
+                        {
+                            fg_ptr = (const value_type*)
+                                base_type::source().row_ptr(y_lr) + x_lr + x_lr + x_lr;
+
+                            fg[0] += weight * *fg_ptr++;
+                            fg[1] += weight * *fg_ptr++;
+                            fg[2] += weight * *fg_ptr++;
+                            src_alpha += weight * color_type::full_value();
+                        }
+                        else
+                        {
+                            fg[order_type::R] += back_r * weight;
+                            fg[order_type::G] += back_g * weight;
+                            fg[order_type::B] += back_b * weight;
+                            src_alpha         += back_a * weight;
+                        }
+
+                        x_lr++;
+
+                        weight = x_hr * (image_subpixel_scale - y_hr);
+                        if(x_lr >= 0    && y_lr >= 0 &&
+                           x_lr <= maxx && y_lr <= maxy)
+                        {
+                            fg_ptr = (const value_type*)
+                                base_type::source().row_ptr(y_lr) + x_lr + x_lr + x_lr;
+
+                            fg[0]     += weight * *fg_ptr++;
+                            fg[1]     += weight * *fg_ptr++;
+                            fg[2]     += weight * *fg_ptr++;
+                            src_alpha += weight * color_type::full_value();
+                        }
+                        else
+                        {
+                            fg[order_type::R] += back_r * weight;
+                            fg[order_type::G] += back_g * weight;
+                            fg[order_type::B] += back_b * weight;
+                            src_alpha         += back_a * weight;
+                        }
+
+                        x_lr--;
+                        y_lr++;
+
+                        weight = (image_subpixel_scale - x_hr) * y_hr;
+                        if(x_lr >= 0    && y_lr >= 0 &&
+                           x_lr <= maxx && y_lr <= maxy)
+                        {
+                            fg_ptr = (const value_type*)
+                                base_type::source().row_ptr(y_lr) + x_lr + x_lr + x_lr;
+
+                            fg[0] += weight * *fg_ptr++;
+                            fg[1] += weight * *fg_ptr++;
+                            fg[2] += weight * *fg_ptr++;
+                            src_alpha += weight * color_type::full_value();
+                        }
+                        else
+                        {
+                            fg[order_type::R] += back_r * weight;
+                            fg[order_type::G] += back_g * weight;
+                            fg[order_type::B] += back_b * weight;
+                            src_alpha         += back_a * weight;
+                        }
+
+                        x_lr++;
+
+                        weight = x_hr * y_hr;
+                        if(x_lr >= 0    && y_lr >= 0 &&
+                           x_lr <= maxx && y_lr <= maxy)
+                        {
+                            fg_ptr = (const value_type*)
+                                base_type::source().row_ptr(y_lr) + x_lr + x_lr + x_lr;
+
+                            fg[0] += weight * *fg_ptr++;
+                            fg[1] += weight * *fg_ptr++;
+                            fg[2] += weight * *fg_ptr++;
+                            src_alpha += weight * color_type::full_value();
+                        }
+                        else
+                        {
+                            fg[order_type::R] += back_r * weight;
+                            fg[order_type::G] += back_g * weight;
+                            fg[order_type::B] += back_b * weight;
+                            src_alpha         += back_a * weight;
+                        }
+
+                        fg[0] = color_type::downshift(fg[0], image_subpixel_shift * 2);
+                        fg[1] = color_type::downshift(fg[1], image_subpixel_shift * 2);
+                        fg[2] = color_type::downshift(fg[2], image_subpixel_shift * 2);
+                        src_alpha = color_type::downshift(src_alpha, image_subpixel_shift * 2);
+                    }
+                }
+
+                span->r = (value_type)fg[order_type::R];
+                span->g = (value_type)fg[order_type::G];
+                span->b = (value_type)fg[order_type::B];
+                span->a = (value_type)src_alpha;
+                ++span;
+                ++base_type::interpolator();
+
+            } while(--len);
+        }
+    private:
+        color_type m_back_color;
+    };
+
+
+
+    //===============================================span_image_filter_rgb_2x2
+    template<class Source, class Interpolator> 
+    class span_image_filter_rgb_2x2 : 
+    public span_image_filter<Source, Interpolator>
+    {
+    public:
+        typedef Source source_type;
+        typedef typename source_type::color_type color_type;
+        typedef typename source_type::order_type order_type;
+        typedef Interpolator interpolator_type;
+        typedef span_image_filter<source_type, interpolator_type> base_type;
+        typedef typename color_type::value_type value_type;
+        typedef typename color_type::calc_type calc_type;
+        typedef typename color_type::long_type long_type;
+
+        //--------------------------------------------------------------------
+        span_image_filter_rgb_2x2() {}
+        span_image_filter_rgb_2x2(source_type& src, 
+                                  interpolator_type& inter,
+                                  image_filter_lut& filter) :
+            base_type(src, inter, &filter) 
+        {}
+
+
+        //--------------------------------------------------------------------
+        void generate(color_type* span, int x, int y, unsigned len)
+        {
+            base_type::interpolator().begin(x + base_type::filter_dx_dbl(), 
+                                            y + base_type::filter_dy_dbl(), len);
+
+            long_type fg[3];
+
+            const value_type *fg_ptr;
+            const int16* weight_array = base_type::filter().weight_array() + 
+                                        ((base_type::filter().diameter()/2 - 1) << 
+                                          image_subpixel_shift);
+            do
+            {
+                int x_hr;
+                int y_hr;
+
+                base_type::interpolator().coordinates(&x_hr, &y_hr);
+
+                x_hr -= base_type::filter_dx_int();
+                y_hr -= base_type::filter_dy_int();
+
+                int x_lr = x_hr >> image_subpixel_shift;
+                int y_lr = y_hr >> image_subpixel_shift;
+
+                unsigned weight;
+                fg[0] = fg[1] = fg[2] = 0;
+
+                x_hr &= image_subpixel_mask;
+                y_hr &= image_subpixel_mask;
+
+                fg_ptr = (const value_type*)base_type::source().span(x_lr, y_lr, 2);
+                weight = (weight_array[x_hr + image_subpixel_scale] * 
+                          weight_array[y_hr + image_subpixel_scale] + 
+                          image_filter_scale / 2) >> 
+                          image_filter_shift;
+                fg[0] += weight * *fg_ptr++;
+                fg[1] += weight * *fg_ptr++;
+                fg[2] += weight * *fg_ptr;
+
+                fg_ptr = (const value_type*)base_type::source().next_x();
+                weight = (weight_array[x_hr] * 
+                          weight_array[y_hr + image_subpixel_scale] + 
+                          image_filter_scale / 2) >> 
+                          image_filter_shift;
+                fg[0] += weight * *fg_ptr++;
+                fg[1] += weight * *fg_ptr++;
+                fg[2] += weight * *fg_ptr;
+
+                fg_ptr = (const value_type*)base_type::source().next_y();
+                weight = (weight_array[x_hr + image_subpixel_scale] * 
+                          weight_array[y_hr] + 
+                          image_filter_scale / 2) >> 
+                          image_filter_shift;
+                fg[0] += weight * *fg_ptr++;
+                fg[1] += weight * *fg_ptr++;
+                fg[2] += weight * *fg_ptr;
+
+                fg_ptr = (const value_type*)base_type::source().next_x();
+                weight = (weight_array[x_hr] * 
+                          weight_array[y_hr] + 
+                          image_filter_scale / 2) >> 
+                          image_filter_shift;
+                fg[0] += weight * *fg_ptr++;
+                fg[1] += weight * *fg_ptr++;
+                fg[2] += weight * *fg_ptr;
+
+                fg[0] = color_type::downshift(fg[0], image_filter_shift);
+                fg[1] = color_type::downshift(fg[1], image_filter_shift);
+                fg[2] = color_type::downshift(fg[2], image_filter_shift);
+
+                if(fg[order_type::R] > color_type::full_value()) fg[order_type::R] = color_type::full_value();
+                if(fg[order_type::G] > color_type::full_value()) fg[order_type::G] = color_type::full_value();
+                if(fg[order_type::B] > color_type::full_value()) fg[order_type::B] = color_type::full_value();
+
+                span->r = (value_type)fg[order_type::R];
+                span->g = (value_type)fg[order_type::G];
+                span->b = (value_type)fg[order_type::B];
+                span->a = color_type::full_value();
+
+                ++span;
+                ++base_type::interpolator();
+
+            } while(--len);
+        }
+    };
+
+
+
+    //===================================================span_image_filter_rgb
+    template<class Source, class Interpolator> 
+    class span_image_filter_rgb : 
+    public span_image_filter<Source, Interpolator>
+    {
+    public:
+        typedef Source source_type;
+        typedef typename source_type::color_type color_type;
+        typedef typename source_type::order_type order_type;
+        typedef Interpolator interpolator_type;
+        typedef span_image_filter<source_type, interpolator_type> base_type;
+        typedef typename color_type::value_type value_type;
+        typedef typename color_type::calc_type calc_type;
+        typedef typename color_type::long_type long_type;
+
+        //--------------------------------------------------------------------
+        span_image_filter_rgb() {}
+        span_image_filter_rgb(source_type& src, 
+                              interpolator_type& inter,
+                              image_filter_lut& filter) :
+            base_type(src, inter, &filter) 
+        {}
+
+        //--------------------------------------------------------------------
+        void generate(color_type* span, int x, int y, unsigned len)
+        {
+            base_type::interpolator().begin(x + base_type::filter_dx_dbl(), 
+                                            y + base_type::filter_dy_dbl(), len);
+
+            long_type fg[3];
+            const value_type *fg_ptr;
+
+            unsigned     diameter     = base_type::filter().diameter();
+            int          start        = base_type::filter().start();
+            const int16* weight_array = base_type::filter().weight_array();
+
+            int x_count; 
+            int weight_y;
+
+            do
+            {
+                base_type::interpolator().coordinates(&x, &y);
+
+                x -= base_type::filter_dx_int();
+                y -= base_type::filter_dy_int();
+
+                int x_hr = x; 
+                int y_hr = y; 
+
+                int x_lr = x_hr >> image_subpixel_shift;
+                int y_lr = y_hr >> image_subpixel_shift;
+
+                fg[0] = fg[1] = fg[2] = 0;
+
+                int x_fract = x_hr & image_subpixel_mask;
+                unsigned y_count = diameter;
+
+                y_hr = image_subpixel_mask - (y_hr & image_subpixel_mask);
+                fg_ptr = (const value_type*)base_type::source().span(x_lr + start, 
+                                                                     y_lr + start, 
+                                                                     diameter);
+                for(;;)
+                {
+                    x_count  = diameter;
+                    weight_y = weight_array[y_hr];
+                    x_hr = image_subpixel_mask - x_fract;
+                    for(;;)
+                    {
+                        int weight = (weight_y * weight_array[x_hr] + 
+                                     image_filter_scale / 2) >> 
+                                     image_filter_shift;
+
+                        fg[0] += weight * *fg_ptr++;
+                        fg[1] += weight * *fg_ptr++;
+                        fg[2] += weight * *fg_ptr;
+
+                        if(--x_count == 0) break;
+                        x_hr  += image_subpixel_scale;
+                        fg_ptr = (const value_type*)base_type::source().next_x();
+                    }
+
+                    if(--y_count == 0) break;
+                    y_hr  += image_subpixel_scale;
+                    fg_ptr = (const value_type*)base_type::source().next_y();
+                }
+
+                fg[0] = color_type::downshift(fg[0], image_filter_shift);
+                fg[1] = color_type::downshift(fg[1], image_filter_shift);
+                fg[2] = color_type::downshift(fg[2], image_filter_shift);
+
+                if(fg[0] < 0) fg[0] = 0;
+                if(fg[1] < 0) fg[1] = 0;
+                if(fg[2] < 0) fg[2] = 0;
+
+                if(fg[order_type::R] > color_type::full_value()) fg[order_type::R] = color_type::full_value();
+                if(fg[order_type::G] > color_type::full_value()) fg[order_type::G] = color_type::full_value();
+                if(fg[order_type::B] > color_type::full_value()) fg[order_type::B] = color_type::full_value();
+
+                span->r = (value_type)fg[order_type::R];
+                span->g = (value_type)fg[order_type::G];
+                span->b = (value_type)fg[order_type::B];
+                span->a = color_type::full_value();
+
+                ++span;
+                ++base_type::interpolator();
+
+            } while(--len);
+        }
+    };
+
+
+
+    //==========================================span_image_resample_rgb_affine
+    template<class Source> 
+    class span_image_resample_rgb_affine : 
+    public span_image_resample_affine<Source>
+    {
+    public:
+        typedef Source source_type;
+        typedef typename source_type::color_type color_type;
+        typedef typename source_type::order_type order_type;
+        typedef span_image_resample_affine<source_type> base_type;
+        typedef typename base_type::interpolator_type interpolator_type;
+        typedef typename color_type::value_type value_type;
+        typedef typename color_type::long_type long_type;
+        enum base_scale_e
+        {
+            downscale_shift = image_filter_shift
+        };
+
+        //--------------------------------------------------------------------
+        span_image_resample_rgb_affine() {}
+        span_image_resample_rgb_affine(source_type& src, 
+                                       interpolator_type& inter,
+                                       image_filter_lut& filter) :
+            base_type(src, inter, filter) 
+        {}
+
+
+        //--------------------------------------------------------------------
+        void generate(color_type* span, int x, int y, unsigned len)
+        {
+            base_type::interpolator().begin(x + base_type::filter_dx_dbl(), 
+                                            y + base_type::filter_dy_dbl(), len);
+
+            long_type fg[3];
+
+            int diameter     = base_type::filter().diameter();
+            int filter_scale = diameter << image_subpixel_shift;
+            int radius_x     = (diameter * base_type::m_rx) >> 1;
+            int radius_y     = (diameter * base_type::m_ry) >> 1;
+            int len_x_lr     = 
+                (diameter * base_type::m_rx + image_subpixel_mask) >> 
+                    image_subpixel_shift;
+
+            const int16* weight_array = base_type::filter().weight_array();
+
+            do
+            {
+                base_type::interpolator().coordinates(&x, &y);
+
+                x += base_type::filter_dx_int() - radius_x;
+                y += base_type::filter_dy_int() - radius_y;
+
+                fg[0] = fg[1] = fg[2] = 0;
+
+                int y_lr = y >> image_subpixel_shift;
+                int y_hr = ((image_subpixel_mask - (y & image_subpixel_mask)) * 
+                                base_type::m_ry_inv) >> 
+                                    image_subpixel_shift;
+                int total_weight = 0;
+                int x_lr = x >> image_subpixel_shift;
+                int x_hr = ((image_subpixel_mask - (x & image_subpixel_mask)) * 
+                                base_type::m_rx_inv) >> 
+                                    image_subpixel_shift;
+
+                int x_hr2 = x_hr;
+                const value_type* fg_ptr = 
+                    (const value_type*)base_type::source().span(x_lr, y_lr, len_x_lr);
+                for(;;)
+                {
+                    int weight_y = weight_array[y_hr];
+                    x_hr = x_hr2;
+                    for(;;)
+                    {
+                        int weight = (weight_y * weight_array[x_hr] + 
+                                     image_filter_scale / 2) >> 
+                                     downscale_shift;
+
+                        fg[0] += *fg_ptr++ * weight;
+                        fg[1] += *fg_ptr++ * weight;
+                        fg[2] += *fg_ptr   * weight;
+                        total_weight += weight;
+                        x_hr  += base_type::m_rx_inv;
+                        if(x_hr >= filter_scale) break;
+                        fg_ptr = (const value_type*)base_type::source().next_x();
+                    }
+                    y_hr += base_type::m_ry_inv;
+                    if(y_hr >= filter_scale) break;
+                    fg_ptr = (const value_type*)base_type::source().next_y();
+                }
+
+                fg[0] /= total_weight;
+                fg[1] /= total_weight;
+                fg[2] /= total_weight;
+
+                if(fg[0] < 0) fg[0] = 0;
+                if(fg[1] < 0) fg[1] = 0;
+                if(fg[2] < 0) fg[2] = 0;
+
+                if(fg[order_type::R] > color_type::full_value()) fg[order_type::R] = color_type::full_value();
+                if(fg[order_type::G] > color_type::full_value()) fg[order_type::G] = color_type::full_value();
+                if(fg[order_type::B] > color_type::full_value()) fg[order_type::B] = color_type::full_value();
+
+                span->r = (value_type)fg[order_type::R];
+                span->g = (value_type)fg[order_type::G];
+                span->b = (value_type)fg[order_type::B];
+                span->a = color_type::full_value();
+
+                ++span;
+                ++base_type::interpolator();
+            } while(--len);
+        }
+    };
+
+
+
+    //=================================================span_image_resample_rgb
+    template<class Source, class Interpolator>
+    class span_image_resample_rgb : 
+    public span_image_resample<Source, Interpolator>
+    {
+    public:
+        typedef Source source_type;
+        typedef typename source_type::color_type color_type;
+        typedef typename source_type::order_type order_type;
+        typedef Interpolator interpolator_type;
+        typedef span_image_resample<source_type, interpolator_type> base_type;
+        typedef typename color_type::value_type value_type;
+        typedef typename color_type::long_type long_type;
+        enum base_scale_e
+        {
+            downscale_shift = image_filter_shift
+        };
+
+        //--------------------------------------------------------------------
+        span_image_resample_rgb() {}
+        span_image_resample_rgb(source_type& src, 
+                                interpolator_type& inter,
+                                image_filter_lut& filter) :
+            base_type(src, inter, filter)
+        {}
+
+        //--------------------------------------------------------------------
+        void generate(color_type* span, int x, int y, unsigned len)
+        {
+            base_type::interpolator().begin(x + base_type::filter_dx_dbl(), 
+                                            y + base_type::filter_dy_dbl(), len);
+            long_type fg[3];
+
+            int diameter = base_type::filter().diameter();
+            int filter_scale = diameter << image_subpixel_shift;
+
+            const int16* weight_array = base_type::filter().weight_array();
+            do
+            {
+                int rx;
+                int ry;
+                int rx_inv = image_subpixel_scale;
+                int ry_inv = image_subpixel_scale;
+                base_type::interpolator().coordinates(&x,  &y);
+                base_type::interpolator().local_scale(&rx, &ry);
+                base_type::adjust_scale(&rx, &ry);
+
+                rx_inv = image_subpixel_scale * image_subpixel_scale / rx;
+                ry_inv = image_subpixel_scale * image_subpixel_scale / ry;
+
+                int radius_x = (diameter * rx) >> 1;
+                int radius_y = (diameter * ry) >> 1;
+                int len_x_lr = 
+                    (diameter * rx + image_subpixel_mask) >> 
+                        image_subpixel_shift;
+
+                x += base_type::filter_dx_int() - radius_x;
+                y += base_type::filter_dy_int() - radius_y;
+
+                fg[0] = fg[1] = fg[2] = 0;
+
+                int y_lr = y >> image_subpixel_shift;
+                int y_hr = ((image_subpixel_mask - (y & image_subpixel_mask)) * 
+                               ry_inv) >> 
+                                   image_subpixel_shift;
+                int total_weight = 0;
+                int x_lr = x >> image_subpixel_shift;
+                int x_hr = ((image_subpixel_mask - (x & image_subpixel_mask)) * 
+                               rx_inv) >> 
+                                   image_subpixel_shift;
+                int x_hr2 = x_hr;
+                const value_type* fg_ptr = 
+                    (const value_type*)base_type::source().span(x_lr, y_lr, len_x_lr);
+
+                for(;;)
+                {
+                    int weight_y = weight_array[y_hr];
+                    x_hr = x_hr2;
+                    for(;;)
+                    {
+                        int weight = (weight_y * weight_array[x_hr] + 
+                                     image_filter_scale / 2) >> 
+                                     downscale_shift;
+                        fg[0] += *fg_ptr++ * weight;
+                        fg[1] += *fg_ptr++ * weight;
+                        fg[2] += *fg_ptr   * weight;
+                        total_weight += weight;
+                        x_hr  += rx_inv;
+                        if(x_hr >= filter_scale) break;
+                        fg_ptr = (const value_type*)base_type::source().next_x();
+                    }
+                    y_hr += ry_inv;
+                    if(y_hr >= filter_scale) break;
+                    fg_ptr = (const value_type*)base_type::source().next_y();
+                }
+
+                fg[0] /= total_weight;
+                fg[1] /= total_weight;
+                fg[2] /= total_weight;
+
+                if(fg[0] < 0) fg[0] = 0;
+                if(fg[1] < 0) fg[1] = 0;
+                if(fg[2] < 0) fg[2] = 0;
+
+                if(fg[order_type::R] > color_type::full_value()) fg[order_type::R] = color_type::full_value();
+                if(fg[order_type::G] > color_type::full_value()) fg[order_type::G] = color_type::full_value();
+                if(fg[order_type::B] > color_type::full_value()) fg[order_type::B] = color_type::full_value();
+
+                span->r = (value_type)fg[order_type::R];
+                span->g = (value_type)fg[order_type::G];
+                span->b = (value_type)fg[order_type::B];
+                span->a = color_type::full_value();
+
+                ++span;
+                ++base_type::interpolator();
+            } while(--len);
+        }
+    };
+
+
+}
+
+
+#endif
+
+
+

3rd/agg/include/agg_span_image_filter_rgba.h

@@ -0,0 +1,890 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// Adaptation for high precision colors has been sponsored by 
+// Liberty Technology Systems, Inc., visit http://lib-sys.com
+//
+// Liberty Technology Systems, Inc. is the provider of
+// PostScript and PDF technology for software developers.
+// 
+//----------------------------------------------------------------------------
+#ifndef AGG_SPAN_IMAGE_FILTER_RGBA_INCLUDED
+#define AGG_SPAN_IMAGE_FILTER_RGBA_INCLUDED
+
+#include "agg_basics.h"
+#include "agg_color_rgba.h"
+#include "agg_span_image_filter.h"
+
+
+namespace agg
+{
+
+    //==============================================span_image_filter_rgba_nn
+    template<class Source, class Interpolator> 
+    class span_image_filter_rgba_nn : 
+    public span_image_filter<Source, Interpolator>
+    {
+    public:
+        typedef Source source_type;
+        typedef typename source_type::color_type color_type;
+        typedef typename source_type::order_type order_type;
+        typedef Interpolator interpolator_type;
+        typedef span_image_filter<source_type, interpolator_type> base_type;
+        typedef typename color_type::value_type value_type;
+        typedef typename color_type::calc_type calc_type;
+        typedef typename color_type::long_type long_type;
+
+        //--------------------------------------------------------------------
+        span_image_filter_rgba_nn() {}
+        span_image_filter_rgba_nn(source_type& src, 
+                                  interpolator_type& inter) :
+            base_type(src, inter, 0) 
+        {}
+
+        //--------------------------------------------------------------------
+        void generate(color_type* span, int x, int y, unsigned len)
+        {
+            base_type::interpolator().begin(x + base_type::filter_dx_dbl(), 
+                                            y + base_type::filter_dy_dbl(), len);
+            do
+            {
+                base_type::interpolator().coordinates(&x, &y);
+                const value_type* fg_ptr = (const value_type*)
+                    base_type::source().span(x >> image_subpixel_shift, 
+                                             y >> image_subpixel_shift, 
+                                             1);
+                span->r = fg_ptr[order_type::R];
+                span->g = fg_ptr[order_type::G];
+                span->b = fg_ptr[order_type::B];
+                span->a = fg_ptr[order_type::A];
+                ++span;
+                ++base_type::interpolator();
+
+            } while(--len);
+        }
+    };
+
+
+
+    //=========================================span_image_filter_rgba_bilinear
+    template<class Source, class Interpolator> 
+    class span_image_filter_rgba_bilinear : 
+        public span_image_filter<Source, Interpolator>
+    {
+    public:
+        typedef Source source_type;
+        typedef typename source_type::color_type color_type;
+        typedef typename source_type::order_type order_type;
+        typedef Interpolator interpolator_type;
+        typedef span_image_filter<source_type, interpolator_type> base_type;
+        typedef typename color_type::value_type value_type;
+        typedef typename color_type::calc_type calc_type;
+        typedef typename color_type::long_type long_type;
+
+        //--------------------------------------------------------------------
+        span_image_filter_rgba_bilinear() {}
+        span_image_filter_rgba_bilinear(source_type& src, 
+                                        interpolator_type& inter) :
+            base_type(src, inter, 0) 
+        {}
+
+
+        //--------------------------------------------------------------------
+        void generate(color_type* span, int x, int y, unsigned len)
+        {
+            base_type::interpolator().begin(x + base_type::filter_dx_dbl(), 
+                                            y + base_type::filter_dy_dbl(), len);
+
+            long_type fg[4];
+            const value_type *fg_ptr;
+
+            do
+            {
+                int x_hr;
+                int y_hr;
+
+                base_type::interpolator().coordinates(&x_hr, &y_hr);
+
+                x_hr -= base_type::filter_dx_int();
+                y_hr -= base_type::filter_dy_int();
+
+                int x_lr = x_hr >> image_subpixel_shift;
+                int y_lr = y_hr >> image_subpixel_shift;
+
+                unsigned weight;
+
+                fg[0] = 
+                fg[1] = 
+                fg[2] = 
+                fg[3] = image_subpixel_scale * image_subpixel_scale / 2;
+
+                x_hr &= image_subpixel_mask;
+                y_hr &= image_subpixel_mask;
+
+                fg_ptr = (const value_type*)base_type::source().span(x_lr, y_lr, 2);
+                weight = (image_subpixel_scale - x_hr) * 
+                         (image_subpixel_scale - y_hr);
+                fg[0] += weight * *fg_ptr++;
+                fg[1] += weight * *fg_ptr++;
+                fg[2] += weight * *fg_ptr++;
+                fg[3] += weight * *fg_ptr;
+
+                fg_ptr = (const value_type*)base_type::source().next_x();
+                weight = x_hr * (image_subpixel_scale - y_hr);
+                fg[0] += weight * *fg_ptr++;
+                fg[1] += weight * *fg_ptr++;
+                fg[2] += weight * *fg_ptr++;
+                fg[3] += weight * *fg_ptr;
+
+                fg_ptr = (const value_type*)base_type::source().next_y();
+                weight = (image_subpixel_scale - x_hr) * y_hr;
+                fg[0] += weight * *fg_ptr++;
+                fg[1] += weight * *fg_ptr++;
+                fg[2] += weight * *fg_ptr++;
+                fg[3] += weight * *fg_ptr;
+
+                fg_ptr = (const value_type*)base_type::source().next_x();
+                weight = x_hr * y_hr;
+                fg[0] += weight * *fg_ptr++;
+                fg[1] += weight * *fg_ptr++;
+                fg[2] += weight * *fg_ptr++;
+                fg[3] += weight * *fg_ptr;
+
+                span->r = value_type(color_type::downshift(fg[order_type::R], image_subpixel_shift * 2));
+                span->g = value_type(color_type::downshift(fg[order_type::G], image_subpixel_shift * 2));
+                span->b = value_type(color_type::downshift(fg[order_type::B], image_subpixel_shift * 2));
+                span->a = value_type(color_type::downshift(fg[order_type::A], image_subpixel_shift * 2));
+
+                ++span;
+                ++base_type::interpolator();
+
+            } while(--len);
+        }
+    };
+
+
+    //====================================span_image_filter_rgba_bilinear_clip
+    template<class Source, class Interpolator> 
+    class span_image_filter_rgba_bilinear_clip : 
+    public span_image_filter<Source, Interpolator>
+    {
+    public:
+        typedef Source source_type;
+        typedef typename source_type::color_type color_type;
+        typedef typename source_type::order_type order_type;
+        typedef Interpolator interpolator_type;
+        typedef span_image_filter<source_type, interpolator_type> base_type;
+        typedef typename color_type::value_type value_type;
+        typedef typename color_type::calc_type calc_type;
+        typedef typename color_type::long_type long_type;
+
+        //--------------------------------------------------------------------
+        span_image_filter_rgba_bilinear_clip() {}
+        span_image_filter_rgba_bilinear_clip(source_type& src, 
+                                             const color_type& back_color,
+                                             interpolator_type& inter) :
+            base_type(src, inter, 0),
+            m_back_color(back_color)
+        {}
+        const color_type& background_color() const { return m_back_color; }
+        void background_color(const color_type& v)   { m_back_color = v; }
+
+
+        //--------------------------------------------------------------------
+        void generate(color_type* span, int x, int y, unsigned len)
+        {
+            base_type::interpolator().begin(x + base_type::filter_dx_dbl(), 
+                                            y + base_type::filter_dy_dbl(), len);
+
+            long_type fg[4];
+            value_type back_r = m_back_color.r;
+            value_type back_g = m_back_color.g;
+            value_type back_b = m_back_color.b;
+            value_type back_a = m_back_color.a;
+
+            const value_type *fg_ptr;
+            int maxx = base_type::source().width() - 1;
+            int maxy = base_type::source().height() - 1;
+
+            do
+            {
+                int x_hr;
+                int y_hr;
+
+                base_type::interpolator().coordinates(&x_hr, &y_hr);
+
+                x_hr -= base_type::filter_dx_int();
+                y_hr -= base_type::filter_dy_int();
+
+                int x_lr = x_hr >> image_subpixel_shift;
+                int y_lr = y_hr >> image_subpixel_shift;
+
+                unsigned weight;
+
+                if(x_lr >= 0    && y_lr >= 0 &&
+                   x_lr <  maxx && y_lr <  maxy) 
+                {
+                    fg[0] = fg[1] = fg[2] = fg[3] = 0;
+
+                    x_hr &= image_subpixel_mask;
+                    y_hr &= image_subpixel_mask;
+
+                    fg_ptr = (const value_type*)
+                        base_type::source().row_ptr(y_lr) + (x_lr << 2);
+
+                    weight = (image_subpixel_scale - x_hr) * 
+                             (image_subpixel_scale - y_hr);
+                    fg[0] += weight * *fg_ptr++;
+                    fg[1] += weight * *fg_ptr++;
+                    fg[2] += weight * *fg_ptr++;
+                    fg[3] += weight * *fg_ptr++;
+
+                    weight = x_hr * (image_subpixel_scale - y_hr);
+                    fg[0] += weight * *fg_ptr++;
+                    fg[1] += weight * *fg_ptr++;
+                    fg[2] += weight * *fg_ptr++;
+                    fg[3] += weight * *fg_ptr++;
+
+                    ++y_lr;
+                    fg_ptr = (const value_type*)
+                        base_type::source().row_ptr(y_lr) + (x_lr << 2);
+
+                    weight = (image_subpixel_scale - x_hr) * y_hr;
+                    fg[0] += weight * *fg_ptr++;
+                    fg[1] += weight * *fg_ptr++;
+                    fg[2] += weight * *fg_ptr++;
+                    fg[3] += weight * *fg_ptr++;
+
+                    weight = x_hr * y_hr;
+                    fg[0] += weight * *fg_ptr++;
+                    fg[1] += weight * *fg_ptr++;
+                    fg[2] += weight * *fg_ptr++;
+                    fg[3] += weight * *fg_ptr++;
+
+                    fg[0] = color_type::downshift(fg[0], image_subpixel_shift * 2);
+                    fg[1] = color_type::downshift(fg[1], image_subpixel_shift * 2);
+                    fg[2] = color_type::downshift(fg[2], image_subpixel_shift * 2);
+                    fg[3] = color_type::downshift(fg[3], image_subpixel_shift * 2);
+                }
+                else
+                {
+                    if(x_lr < -1   || y_lr < -1 ||
+                       x_lr > maxx || y_lr > maxy)
+                    {
+                        fg[order_type::R] = back_r;
+                        fg[order_type::G] = back_g;
+                        fg[order_type::B] = back_b;
+                        fg[order_type::A] = back_a;
+                    }
+                    else
+                    {
+                        fg[0] = fg[1] = fg[2] = fg[3] = 0;
+
+                        x_hr &= image_subpixel_mask;
+                        y_hr &= image_subpixel_mask;
+
+                        weight = (image_subpixel_scale - x_hr) * 
+                                 (image_subpixel_scale - y_hr);
+                        if(x_lr >= 0    && y_lr >= 0 &&
+                           x_lr <= maxx && y_lr <= maxy)
+                        {
+                            fg_ptr = (const value_type*)
+                                base_type::source().row_ptr(y_lr) + (x_lr << 2);
+
+                            fg[0] += weight * *fg_ptr++;
+                            fg[1] += weight * *fg_ptr++;
+                            fg[2] += weight * *fg_ptr++;
+                            fg[3] += weight * *fg_ptr++;
+                        }
+                        else
+                        {
+                            fg[order_type::R] += back_r * weight;
+                            fg[order_type::G] += back_g * weight;
+                            fg[order_type::B] += back_b * weight;
+                            fg[order_type::A] += back_a * weight;
+                        }
+
+                        x_lr++;
+
+                        weight = x_hr * (image_subpixel_scale - y_hr);
+                        if(x_lr >= 0    && y_lr >= 0 &&
+                           x_lr <= maxx && y_lr <= maxy)
+                        {
+                            fg_ptr = (const value_type*)
+                                base_type::source().row_ptr(y_lr) + (x_lr << 2);
+
+                            fg[0] += weight * *fg_ptr++;
+                            fg[1] += weight * *fg_ptr++;
+                            fg[2] += weight * *fg_ptr++;
+                            fg[3] += weight * *fg_ptr++;
+                        }
+                        else
+                        {
+                            fg[order_type::R] += back_r * weight;
+                            fg[order_type::G] += back_g * weight;
+                            fg[order_type::B] += back_b * weight;
+                            fg[order_type::A] += back_a * weight;
+                        }
+
+                        x_lr--;
+                        y_lr++;
+
+                        weight = (image_subpixel_scale - x_hr) * y_hr;
+                        if(x_lr >= 0    && y_lr >= 0 &&
+                           x_lr <= maxx && y_lr <= maxy)
+                        {
+                            fg_ptr = (const value_type*)
+                                base_type::source().row_ptr(y_lr) + (x_lr << 2);
+
+                            fg[0] += weight * *fg_ptr++;
+                            fg[1] += weight * *fg_ptr++;
+                            fg[2] += weight * *fg_ptr++;
+                            fg[3] += weight * *fg_ptr++;
+                        }
+                        else
+                        {
+                            fg[order_type::R] += back_r * weight;
+                            fg[order_type::G] += back_g * weight;
+                            fg[order_type::B] += back_b * weight;
+                            fg[order_type::A] += back_a * weight;
+                        }
+
+                        x_lr++;
+
+                        weight = x_hr * y_hr;
+                        if(x_lr >= 0    && y_lr >= 0 &&
+                           x_lr <= maxx && y_lr <= maxy)
+                        {
+                            fg_ptr = (const value_type*)
+                                base_type::source().row_ptr(y_lr) + (x_lr << 2);
+
+                            fg[0] += weight * *fg_ptr++;
+                            fg[1] += weight * *fg_ptr++;
+                            fg[2] += weight * *fg_ptr++;
+                            fg[3] += weight * *fg_ptr++;
+                        }
+                        else
+                        {
+                            fg[order_type::R] += back_r * weight;
+                            fg[order_type::G] += back_g * weight;
+                            fg[order_type::B] += back_b * weight;
+                            fg[order_type::A] += back_a * weight;
+                        }
+
+                        fg[0] = color_type::downshift(fg[0], image_subpixel_shift * 2);
+                        fg[1] = color_type::downshift(fg[1], image_subpixel_shift * 2);
+                        fg[2] = color_type::downshift(fg[2], image_subpixel_shift * 2);
+                        fg[3] = color_type::downshift(fg[3], image_subpixel_shift * 2);
+                    }
+                }
+
+                span->r = (value_type)fg[order_type::R];
+                span->g = (value_type)fg[order_type::G];
+                span->b = (value_type)fg[order_type::B];
+                span->a = (value_type)fg[order_type::A];
+                ++span;
+                ++base_type::interpolator();
+
+            } while(--len);
+        }
+    private:
+        color_type m_back_color;
+    };
+
+
+    //==============================================span_image_filter_rgba_2x2
+    template<class Source, class Interpolator> 
+    class span_image_filter_rgba_2x2 : 
+    public span_image_filter<Source, Interpolator>
+    {
+    public:
+        typedef Source source_type;
+        typedef typename source_type::color_type color_type;
+        typedef typename source_type::order_type order_type;
+        typedef Interpolator interpolator_type;
+        typedef span_image_filter<source_type, interpolator_type> base_type;
+        typedef typename color_type::value_type value_type;
+        typedef typename color_type::calc_type calc_type;
+        typedef typename color_type::long_type long_type;
+
+        //--------------------------------------------------------------------
+        span_image_filter_rgba_2x2() {}
+        span_image_filter_rgba_2x2(source_type& src, 
+                                   interpolator_type& inter,
+                                   image_filter_lut& filter) :
+            base_type(src, inter, &filter) 
+        {}
+
+
+        //--------------------------------------------------------------------
+        void generate(color_type* span, int x, int y, unsigned len)
+        {
+            base_type::interpolator().begin(x + base_type::filter_dx_dbl(), 
+                                            y + base_type::filter_dy_dbl(), len);
+
+            long_type fg[4];
+
+            const value_type *fg_ptr;
+            const int16* weight_array = base_type::filter().weight_array() + 
+                                        ((base_type::filter().diameter()/2 - 1) << 
+                                          image_subpixel_shift);
+
+            do
+            {
+                int x_hr;
+                int y_hr;
+
+                base_type::interpolator().coordinates(&x_hr, &y_hr);
+
+                x_hr -= base_type::filter_dx_int();
+                y_hr -= base_type::filter_dy_int();
+
+                int x_lr = x_hr >> image_subpixel_shift;
+                int y_lr = y_hr >> image_subpixel_shift;
+
+                unsigned weight;
+                fg[0] = fg[1] = fg[2] = fg[3] = 0;
+
+                x_hr &= image_subpixel_mask;
+                y_hr &= image_subpixel_mask;
+
+                fg_ptr = (const value_type*)base_type::source().span(x_lr, y_lr, 2);
+                weight = (weight_array[x_hr + image_subpixel_scale] * 
+                          weight_array[y_hr + image_subpixel_scale] + 
+                          image_filter_scale / 2) >> 
+                          image_filter_shift;
+                fg[0] += weight * *fg_ptr++;
+                fg[1] += weight * *fg_ptr++;
+                fg[2] += weight * *fg_ptr++;
+                fg[3] += weight * *fg_ptr;
+
+                fg_ptr = (const value_type*)base_type::source().next_x();
+                weight = (weight_array[x_hr] * 
+                          weight_array[y_hr + image_subpixel_scale] + 
+                          image_filter_scale / 2) >> 
+                          image_filter_shift;
+                fg[0] += weight * *fg_ptr++;
+                fg[1] += weight * *fg_ptr++;
+                fg[2] += weight * *fg_ptr++;
+                fg[3] += weight * *fg_ptr;
+
+                fg_ptr = (const value_type*)base_type::source().next_y();
+                weight = (weight_array[x_hr + image_subpixel_scale] * 
+                          weight_array[y_hr] + 
+                          image_filter_scale / 2) >> 
+                          image_filter_shift;
+                fg[0] += weight * *fg_ptr++;
+                fg[1] += weight * *fg_ptr++;
+                fg[2] += weight * *fg_ptr++;
+                fg[3] += weight * *fg_ptr;
+
+                fg_ptr = (const value_type*)base_type::source().next_x();
+                weight = (weight_array[x_hr] * 
+                          weight_array[y_hr] + 
+                          image_filter_scale / 2) >> 
+                          image_filter_shift;
+                fg[0] += weight * *fg_ptr++;
+                fg[1] += weight * *fg_ptr++;
+                fg[2] += weight * *fg_ptr++;
+                fg[3] += weight * *fg_ptr;
+
+                fg[0] = color_type::downshift(fg[0], image_filter_shift);
+                fg[1] = color_type::downshift(fg[1], image_filter_shift);
+                fg[2] = color_type::downshift(fg[2], image_filter_shift);
+                fg[3] = color_type::downshift(fg[3], image_filter_shift);
+
+                if(fg[order_type::A] > color_type::full_value()) fg[order_type::A] = color_type::full_value();
+                if(fg[order_type::R] > fg[order_type::A]) fg[order_type::R] = fg[order_type::A];
+                if(fg[order_type::G] > fg[order_type::A]) fg[order_type::G] = fg[order_type::A];
+                if(fg[order_type::B] > fg[order_type::A]) fg[order_type::B] = fg[order_type::A];
+
+                span->r = (value_type)fg[order_type::R];
+                span->g = (value_type)fg[order_type::G];
+                span->b = (value_type)fg[order_type::B];
+                span->a = (value_type)fg[order_type::A];
+                ++span;
+                ++base_type::interpolator();
+
+            } while(--len);
+        }
+    };
+
+
+
+    //==================================================span_image_filter_rgba
+    template<class Source, class Interpolator> 
+    class span_image_filter_rgba : 
+    public span_image_filter<Source, Interpolator>
+    {
+    public:
+        typedef Source source_type;
+        typedef typename source_type::color_type color_type;
+        typedef typename source_type::order_type order_type;
+        typedef Interpolator interpolator_type;
+        typedef span_image_filter<source_type, interpolator_type> base_type;
+        typedef typename color_type::value_type value_type;
+        typedef typename color_type::calc_type calc_type;
+        typedef typename color_type::long_type long_type;
+
+        //--------------------------------------------------------------------
+        span_image_filter_rgba() {}
+        span_image_filter_rgba(source_type& src, 
+                               interpolator_type& inter,
+                               image_filter_lut& filter) :
+            base_type(src, inter, &filter) 
+        {}
+
+        //--------------------------------------------------------------------
+        void generate(color_type* span, int x, int y, unsigned len)
+        {
+            base_type::interpolator().begin(x + base_type::filter_dx_dbl(), 
+                                            y + base_type::filter_dy_dbl(), len);
+
+            long_type fg[4];
+            const value_type *fg_ptr;
+
+            unsigned     diameter     = base_type::filter().diameter();
+            int          start        = base_type::filter().start();
+            const int16* weight_array = base_type::filter().weight_array();
+
+            int x_count; 
+            int weight_y;
+
+            do
+            {
+                base_type::interpolator().coordinates(&x, &y);
+
+                x -= base_type::filter_dx_int();
+                y -= base_type::filter_dy_int();
+
+                int x_hr = x; 
+                int y_hr = y; 
+
+                int x_lr = x_hr >> image_subpixel_shift;
+                int y_lr = y_hr >> image_subpixel_shift;
+
+                fg[0] = fg[1] = fg[2] = fg[3] = 0;
+
+                int x_fract = x_hr & image_subpixel_mask;
+                unsigned y_count = diameter;
+
+                y_hr = image_subpixel_mask - (y_hr & image_subpixel_mask);
+                fg_ptr = (const value_type*)base_type::source().span(x_lr + start, 
+                                                                     y_lr + start, 
+                                                                     diameter);
+                for(;;)
+                {
+                    x_count  = diameter;
+                    weight_y = weight_array[y_hr];
+                    x_hr = image_subpixel_mask - x_fract;
+                    for(;;)
+                    {
+                        int weight = (weight_y * weight_array[x_hr] + 
+                                     image_filter_scale / 2) >> 
+                                     image_filter_shift;
+
+                        fg[0] += weight * *fg_ptr++;
+                        fg[1] += weight * *fg_ptr++;
+                        fg[2] += weight * *fg_ptr++;
+                        fg[3] += weight * *fg_ptr;
+
+                        if(--x_count == 0) break;
+                        x_hr  += image_subpixel_scale;
+                        fg_ptr = (const value_type*)base_type::source().next_x();
+                    }
+
+                    if(--y_count == 0) break;
+                    y_hr  += image_subpixel_scale;
+                    fg_ptr = (const value_type*)base_type::source().next_y();
+                }
+
+                fg[0] = color_type::downshift(fg[0], image_filter_shift);
+                fg[1] = color_type::downshift(fg[1], image_filter_shift);
+                fg[2] = color_type::downshift(fg[2], image_filter_shift);
+                fg[3] = color_type::downshift(fg[3], image_filter_shift);
+
+                if(fg[0] < 0) fg[0] = 0;
+                if(fg[1] < 0) fg[1] = 0;
+                if(fg[2] < 0) fg[2] = 0;
+                if(fg[3] < 0) fg[3] = 0;
+
+                if(fg[order_type::A] > color_type::full_value()) fg[order_type::A] = color_type::full_value();
+                if(fg[order_type::R] > fg[order_type::A]) fg[order_type::R] = fg[order_type::A];
+                if(fg[order_type::G] > fg[order_type::A]) fg[order_type::G] = fg[order_type::A];
+                if(fg[order_type::B] > fg[order_type::A]) fg[order_type::B] = fg[order_type::A];
+
+                span->r = (value_type)fg[order_type::R];
+                span->g = (value_type)fg[order_type::G];
+                span->b = (value_type)fg[order_type::B];
+                span->a = (value_type)fg[order_type::A];
+                ++span;
+                ++base_type::interpolator();
+
+            } while(--len);
+        }
+    };
+
+
+
+    //========================================span_image_resample_rgba_affine
+    template<class Source> 
+    class span_image_resample_rgba_affine : 
+    public span_image_resample_affine<Source>
+    {
+    public:
+        typedef Source source_type;
+        typedef typename source_type::color_type color_type;
+        typedef typename source_type::order_type order_type;
+        typedef span_image_resample_affine<source_type> base_type;
+        typedef typename base_type::interpolator_type interpolator_type;
+        typedef typename color_type::value_type value_type;
+        typedef typename color_type::long_type long_type;
+        enum base_scale_e
+        {
+            downscale_shift = image_filter_shift
+        };
+
+        //--------------------------------------------------------------------
+        span_image_resample_rgba_affine() {}
+        span_image_resample_rgba_affine(source_type& src, 
+                                        interpolator_type& inter,
+                                        image_filter_lut& filter) :
+            base_type(src, inter, filter) 
+        {}
+
+
+        //--------------------------------------------------------------------
+        void generate(color_type* span, int x, int y, unsigned len)
+        {
+            base_type::interpolator().begin(x + base_type::filter_dx_dbl(), 
+                                            y + base_type::filter_dy_dbl(), len);
+
+            long_type fg[4];
+
+            int diameter     = base_type::filter().diameter();
+            int filter_scale = diameter << image_subpixel_shift;
+            int radius_x     = (diameter * base_type::m_rx) >> 1;
+            int radius_y     = (diameter * base_type::m_ry) >> 1;
+            int len_x_lr     = 
+                (diameter * base_type::m_rx + image_subpixel_mask) >> 
+                    image_subpixel_shift;
+
+            const int16* weight_array = base_type::filter().weight_array();
+
+            do
+            {
+                base_type::interpolator().coordinates(&x, &y);
+
+                x += base_type::filter_dx_int() - radius_x;
+                y += base_type::filter_dy_int() - radius_y;
+
+                fg[0] = fg[1] = fg[2] = fg[3] = 0;
+
+                int y_lr = y >> image_subpixel_shift;
+                int y_hr = ((image_subpixel_mask - (y & image_subpixel_mask)) * 
+                                base_type::m_ry_inv) >> 
+                                    image_subpixel_shift;
+                int total_weight = 0;
+                int x_lr = x >> image_subpixel_shift;
+                int x_hr = ((image_subpixel_mask - (x & image_subpixel_mask)) * 
+                                base_type::m_rx_inv) >> 
+                                    image_subpixel_shift;
+
+                int x_hr2 = x_hr;
+                const value_type* fg_ptr = 
+                    (const value_type*)base_type::source().span(x_lr, y_lr, len_x_lr);
+                for(;;)
+                {
+                    int weight_y = weight_array[y_hr];
+                    x_hr = x_hr2;
+                    for(;;)
+                    {
+                        int weight = (weight_y * weight_array[x_hr] + 
+                                     image_filter_scale / 2) >> 
+                                     downscale_shift;
+
+                        fg[0] += *fg_ptr++ * weight;
+                        fg[1] += *fg_ptr++ * weight;
+                        fg[2] += *fg_ptr++ * weight;
+                        fg[3] += *fg_ptr++ * weight;
+                        total_weight += weight;
+                        x_hr  += base_type::m_rx_inv;
+                        if(x_hr >= filter_scale) break;
+                        fg_ptr = (const value_type*)base_type::source().next_x();
+                    }
+                    y_hr += base_type::m_ry_inv;
+                    if(y_hr >= filter_scale) break;
+                    fg_ptr = (const value_type*)base_type::source().next_y();
+                }
+
+                fg[0] /= total_weight;
+                fg[1] /= total_weight;
+                fg[2] /= total_weight;
+                fg[3] /= total_weight;
+
+                if(fg[0] < 0) fg[0] = 0;
+                if(fg[1] < 0) fg[1] = 0;
+                if(fg[2] < 0) fg[2] = 0;
+                if(fg[3] < 0) fg[3] = 0;
+
+                if(fg[order_type::A] > color_type::full_value()) fg[order_type::A] = color_type::full_value();
+                if(fg[order_type::R] > fg[order_type::A]) fg[order_type::R] = fg[order_type::A];
+                if(fg[order_type::G] > fg[order_type::A]) fg[order_type::G] = fg[order_type::A];
+                if(fg[order_type::B] > fg[order_type::A]) fg[order_type::B] = fg[order_type::A];
+
+                span->r = (value_type)fg[order_type::R];
+                span->g = (value_type)fg[order_type::G];
+                span->b = (value_type)fg[order_type::B];
+                span->a = (value_type)fg[order_type::A];
+
+                ++span;
+                ++base_type::interpolator();
+            } while(--len);
+        }
+    };
+
+
+
+    //==============================================span_image_resample_rgba
+    template<class Source, class Interpolator>
+    class span_image_resample_rgba : 
+    public span_image_resample<Source, Interpolator>
+    {
+    public:
+        typedef Source source_type;
+        typedef typename source_type::color_type color_type;
+        typedef typename source_type::order_type order_type;
+        typedef Interpolator interpolator_type;
+        typedef span_image_resample<source_type, interpolator_type> base_type;
+        typedef typename color_type::value_type value_type;
+        typedef typename color_type::long_type long_type;
+        enum base_scale_e
+        {
+            downscale_shift = image_filter_shift
+        };
+
+        //--------------------------------------------------------------------
+        span_image_resample_rgba() {}
+        span_image_resample_rgba(source_type& src, 
+                                 interpolator_type& inter,
+                                 image_filter_lut& filter) :
+            base_type(src, inter, filter)
+        {}
+
+        //--------------------------------------------------------------------
+        void generate(color_type* span, int x, int y, unsigned len)
+        {
+            base_type::interpolator().begin(x + base_type::filter_dx_dbl(), 
+                                            y + base_type::filter_dy_dbl(), len);
+            long_type fg[4];
+
+            int diameter = base_type::filter().diameter();
+            int filter_scale = diameter << image_subpixel_shift;
+
+            const int16* weight_array = base_type::filter().weight_array();
+            do
+            {
+                int rx;
+                int ry;
+                int rx_inv = image_subpixel_scale;
+                int ry_inv = image_subpixel_scale;
+                base_type::interpolator().coordinates(&x,  &y);
+                base_type::interpolator().local_scale(&rx, &ry);
+                base_type::adjust_scale(&rx, &ry);
+
+                rx_inv = image_subpixel_scale * image_subpixel_scale / rx;
+                ry_inv = image_subpixel_scale * image_subpixel_scale / ry;
+
+                int radius_x = (diameter * rx) >> 1;
+                int radius_y = (diameter * ry) >> 1;
+                int len_x_lr = 
+                    (diameter * rx + image_subpixel_mask) >> 
+                        image_subpixel_shift;
+
+                x += base_type::filter_dx_int() - radius_x;
+                y += base_type::filter_dy_int() - radius_y;
+
+                fg[0] = fg[1] = fg[2] = fg[3] = 0;
+
+                int y_lr = y >> image_subpixel_shift;
+                int y_hr = ((image_subpixel_mask - (y & image_subpixel_mask)) * 
+                               ry_inv) >> 
+                                   image_subpixel_shift;
+                int total_weight = 0;
+                int x_lr = x >> image_subpixel_shift;
+                int x_hr = ((image_subpixel_mask - (x & image_subpixel_mask)) * 
+                               rx_inv) >> 
+                                   image_subpixel_shift;
+                int x_hr2 = x_hr;
+                const value_type* fg_ptr = 
+                    (const value_type*)base_type::source().span(x_lr, y_lr, len_x_lr);
+
+                for(;;)
+                {
+                    int weight_y = weight_array[y_hr];
+                    x_hr = x_hr2;
+                    for(;;)
+                    {
+                        int weight = (weight_y * weight_array[x_hr] + 
+                                     image_filter_scale / 2) >> 
+                                     downscale_shift;
+                        fg[0] += *fg_ptr++ * weight;
+                        fg[1] += *fg_ptr++ * weight;
+                        fg[2] += *fg_ptr++ * weight;
+                        fg[3] += *fg_ptr++ * weight;
+                        total_weight += weight;
+                        x_hr  += rx_inv;
+                        if(x_hr >= filter_scale) break;
+                        fg_ptr = (const value_type*)base_type::source().next_x();
+                    }
+                    y_hr += ry_inv;
+                    if(y_hr >= filter_scale) break;
+                    fg_ptr = (const value_type*)base_type::source().next_y();
+                }
+
+                fg[0] /= total_weight;
+                fg[1] /= total_weight;
+                fg[2] /= total_weight;
+                fg[3] /= total_weight;
+
+                if(fg[0] < 0) fg[0] = 0;
+                if(fg[1] < 0) fg[1] = 0;
+                if(fg[2] < 0) fg[2] = 0;
+                if(fg[3] < 0) fg[3] = 0;
+
+                if(fg[order_type::A] > color_type::full_value()) fg[order_type::A] = color_type::full_value();
+                if(fg[order_type::R] > fg[order_type::R]) fg[order_type::R] = fg[order_type::R];
+                if(fg[order_type::G] > fg[order_type::G]) fg[order_type::G] = fg[order_type::G];
+                if(fg[order_type::B] > fg[order_type::B]) fg[order_type::B] = fg[order_type::B];
+
+                span->r = (value_type)fg[order_type::R];
+                span->g = (value_type)fg[order_type::G];
+                span->b = (value_type)fg[order_type::B];
+                span->a = (value_type)fg[order_type::A];
+
+                ++span;
+                ++base_type::interpolator();
+            } while(--len);
+        }
+    };
+
+
+}
+
+
+#endif
+
+
+

3rd/agg/include/agg_span_interpolator_linear.h

@@ -0,0 +1,232 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+
+#ifndef AGG_SPAN_INTERPOLATOR_LINEAR_INCLUDED
+#define AGG_SPAN_INTERPOLATOR_LINEAR_INCLUDED
+
+#include "agg_basics.h"
+#include "agg_dda_line.h"
+#include "agg_trans_affine.h"
+
+namespace agg
+{
+
+    //================================================span_interpolator_linear
+    template<class Transformer = trans_affine, unsigned SubpixelShift = 8> 
+    class span_interpolator_linear
+    {
+    public:
+        typedef Transformer trans_type;
+
+        enum subpixel_scale_e
+        {
+            subpixel_shift = SubpixelShift,
+            subpixel_scale  = 1 << subpixel_shift
+        };
+
+        //--------------------------------------------------------------------
+        span_interpolator_linear() {}
+        span_interpolator_linear(trans_type& trans) : m_trans(&trans) {}
+        span_interpolator_linear(trans_type& trans,
+                                 double x, double y, unsigned len) :
+            m_trans(&trans)
+        {
+            begin(x, y, len);
+        }
+
+        //----------------------------------------------------------------
+        const trans_type& transformer() const { return *m_trans; }
+        void transformer(trans_type& trans) { m_trans = &trans; }
+
+        //----------------------------------------------------------------
+        void begin(double x, double y, unsigned len)
+        {
+            double tx;
+            double ty;
+
+            tx = x;
+            ty = y;
+            m_trans->transform(&tx, &ty);
+            int x1 = iround(tx * subpixel_scale);
+            int y1 = iround(ty * subpixel_scale);
+
+            tx = x + len;
+            ty = y;
+            m_trans->transform(&tx, &ty);
+            int x2 = iround(tx * subpixel_scale);
+            int y2 = iround(ty * subpixel_scale);
+
+            m_li_x = dda2_line_interpolator(x1, x2, len);
+            m_li_y = dda2_line_interpolator(y1, y2, len);
+        }
+
+        //----------------------------------------------------------------
+        void resynchronize(double xe, double ye, unsigned len)
+        {
+            m_trans->transform(&xe, &ye);
+            m_li_x = dda2_line_interpolator(m_li_x.y(), iround(xe * subpixel_scale), len);
+            m_li_y = dda2_line_interpolator(m_li_y.y(), iround(ye * subpixel_scale), len);
+        }
+    
+        //----------------------------------------------------------------
+        void operator++()
+        {
+            ++m_li_x;
+            ++m_li_y;
+        }
+
+        //----------------------------------------------------------------
+        void coordinates(int* x, int* y) const
+        {
+            *x = m_li_x.y();
+            *y = m_li_y.y();
+        }
+
+    private:
+        trans_type* m_trans;
+        dda2_line_interpolator m_li_x;
+        dda2_line_interpolator m_li_y;
+    };
+
+
+
+
+
+
+    //=====================================span_interpolator_linear_subdiv
+    template<class Transformer = trans_affine, unsigned SubpixelShift = 8> 
+    class span_interpolator_linear_subdiv
+    {
+    public:
+        typedef Transformer trans_type;
+
+        enum subpixel_scale_e
+        {
+            subpixel_shift = SubpixelShift,
+            subpixel_scale = 1 << subpixel_shift
+        };
+
+
+        //----------------------------------------------------------------
+        span_interpolator_linear_subdiv() :
+            m_subdiv_shift(4),
+            m_subdiv_size(1 << m_subdiv_shift),
+            m_subdiv_mask(m_subdiv_size - 1) {}
+
+        span_interpolator_linear_subdiv(trans_type& trans, 
+                                        unsigned subdiv_shift = 4) : 
+            m_subdiv_shift(subdiv_shift),
+            m_subdiv_size(1 << m_subdiv_shift),
+            m_subdiv_mask(m_subdiv_size - 1),
+            m_trans(&trans) {}
+
+        span_interpolator_linear_subdiv(trans_type& trans,
+                                        double x, double y, unsigned len,
+                                        unsigned subdiv_shift = 4) :
+            m_subdiv_shift(subdiv_shift),
+            m_subdiv_size(1 << m_subdiv_shift),
+            m_subdiv_mask(m_subdiv_size - 1),
+            m_trans(&trans)
+        {
+            begin(x, y, len);
+        }
+
+        //----------------------------------------------------------------
+        const trans_type& transformer() const { return *m_trans; }
+        void transformer(const trans_type& trans) { m_trans = &trans; }
+
+        //----------------------------------------------------------------
+        unsigned subdiv_shift() const { return m_subdiv_shift; }
+        void subdiv_shift(unsigned shift) 
+        {
+            m_subdiv_shift = shift;
+            m_subdiv_size = 1 << m_subdiv_shift;
+            m_subdiv_mask = m_subdiv_size - 1;
+        }
+
+        //----------------------------------------------------------------
+        void begin(double x, double y, unsigned len)
+        {
+            double tx;
+            double ty;
+            m_pos   = 1;
+            m_src_x = iround(x * subpixel_scale) + subpixel_scale;
+            m_src_y = y;
+            m_len   = len;
+
+            if(len > m_subdiv_size) len = m_subdiv_size;
+            tx = x;
+            ty = y;
+            m_trans->transform(&tx, &ty);
+            int x1 = iround(tx * subpixel_scale);
+            int y1 = iround(ty * subpixel_scale);
+
+            tx = x + len;
+            ty = y;
+            m_trans->transform(&tx, &ty);
+
+            m_li_x = dda2_line_interpolator(x1, iround(tx * subpixel_scale), len);
+            m_li_y = dda2_line_interpolator(y1, iround(ty * subpixel_scale), len);
+        }
+
+        //----------------------------------------------------------------
+        void operator++()
+        {
+            ++m_li_x;
+            ++m_li_y;
+            if(m_pos >= m_subdiv_size)
+            {
+                unsigned len = m_len;
+                if(len > m_subdiv_size) len = m_subdiv_size;
+                double tx = double(m_src_x) / double(subpixel_scale) + len;
+                double ty = m_src_y;
+                m_trans->transform(&tx, &ty);
+                m_li_x = dda2_line_interpolator(m_li_x.y(), iround(tx * subpixel_scale), len);
+                m_li_y = dda2_line_interpolator(m_li_y.y(), iround(ty * subpixel_scale), len);
+                m_pos = 0;
+            }
+            m_src_x += subpixel_scale;
+            ++m_pos;
+            --m_len;
+        }
+
+        //----------------------------------------------------------------
+        void coordinates(int* x, int* y) const
+        {
+            *x = m_li_x.y();
+            *y = m_li_y.y();
+        }
+
+    private:
+        unsigned m_subdiv_shift;
+        unsigned m_subdiv_size;
+        unsigned m_subdiv_mask;
+        trans_type* m_trans;
+        dda2_line_interpolator m_li_x;
+        dda2_line_interpolator m_li_y;
+        int      m_src_x;
+        double   m_src_y;
+        unsigned m_pos;
+        unsigned m_len;
+    };
+
+
+}
+
+
+
+#endif
+
+

3rd/agg/include/agg_trans_affine.h

@@ -0,0 +1,518 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// Affine transformation classes.
+//
+//----------------------------------------------------------------------------
+#ifndef AGG_TRANS_AFFINE_INCLUDED
+#define AGG_TRANS_AFFINE_INCLUDED
+
+#include <math.h>
+#include "agg_basics.h"
+
+namespace agg
+{
+    const double affine_epsilon = 1e-14; 
+
+    //============================================================trans_affine
+    //
+    // See Implementation agg_trans_affine.cpp
+    //
+    // Affine transformation are linear transformations in Cartesian coordinates
+    // (strictly speaking not only in Cartesian, but for the beginning we will 
+    // think so). They are rotation, scaling, translation and skewing.  
+    // After any affine transformation a line segment remains a line segment 
+    // and it will never become a curve. 
+    //
+    // There will be no math about matrix calculations, since it has been 
+    // described many times. Ask yourself a very simple question:
+    // "why do we need to understand and use some matrix stuff instead of just 
+    // rotating, scaling and so on". The answers are:
+    //
+    // 1. Any combination of transformations can be done by only 4 multiplications
+    //    and 4 additions in floating point.
+    // 2. One matrix transformation is equivalent to the number of consecutive
+    //    discrete transformations, i.e. the matrix "accumulates" all transformations 
+    //    in the order of their settings. Suppose we have 4 transformations: 
+    //       * rotate by 30 degrees,
+    //       * scale X to 2.0, 
+    //       * scale Y to 1.5, 
+    //       * move to (100, 100). 
+    //    The result will depend on the order of these transformations, 
+    //    and the advantage of matrix is that the sequence of discret calls:
+    //    rotate(30), scaleX(2.0), scaleY(1.5), move(100,100) 
+    //    will have exactly the same result as the following matrix transformations:
+    //   
+    //    affine_matrix m;
+    //    m *= rotate_matrix(30); 
+    //    m *= scaleX_matrix(2.0);
+    //    m *= scaleY_matrix(1.5);
+    //    m *= move_matrix(100,100);
+    //
+    //    m.transform_my_point_at_last(x, y);
+    //
+    // What is the good of it? In real life we will set-up the matrix only once
+    // and then transform many points, let alone the convenience to set any 
+    // combination of transformations.
+    //
+    // So, how to use it? Very easy - literally as it's shown above. Not quite,
+    // let us write a correct example:
+    //
+    // agg::trans_affine m;
+    // m *= agg::trans_affine_rotation(30.0 * 3.1415926 / 180.0);
+    // m *= agg::trans_affine_scaling(2.0, 1.5);
+    // m *= agg::trans_affine_translation(100.0, 100.0);
+    // m.transform(&x, &y);
+    //
+    // The affine matrix is all you need to perform any linear transformation,
+    // but all transformations have origin point (0,0). It means that we need to 
+    // use 2 translations if we want to rotate someting around (100,100):
+    // 
+    // m *= agg::trans_affine_translation(-100.0, -100.0);         // move to (0,0)
+    // m *= agg::trans_affine_rotation(30.0 * 3.1415926 / 180.0);  // rotate
+    // m *= agg::trans_affine_translation(100.0, 100.0);           // move back to (100,100)
+    //----------------------------------------------------------------------
+    struct trans_affine
+    {
+        double sx, shy, shx, sy, tx, ty;
+
+        //------------------------------------------ Construction
+        // Identity matrix
+        trans_affine() :
+            sx(1.0), shy(0.0), shx(0.0), sy(1.0), tx(0.0), ty(0.0)
+        {}
+
+        // Custom matrix. Usually used in derived classes
+        trans_affine(double v0, double v1, double v2, 
+                     double v3, double v4, double v5) :
+            sx(v0), shy(v1), shx(v2), sy(v3), tx(v4), ty(v5)
+        {}
+
+        // Custom matrix from m[6]
+        explicit trans_affine(const double* m) :
+            sx(m[0]), shy(m[1]), shx(m[2]), sy(m[3]), tx(m[4]), ty(m[5])
+        {}
+
+        // Rectangle to a parallelogram.
+        trans_affine(double x1, double y1, double x2, double y2, 
+                     const double* parl)
+        {
+            rect_to_parl(x1, y1, x2, y2, parl);
+        }
+
+        // Parallelogram to a rectangle.
+        trans_affine(const double* parl, 
+                     double x1, double y1, double x2, double y2)
+        {
+            parl_to_rect(parl, x1, y1, x2, y2);
+        }
+
+        // Arbitrary parallelogram transformation.
+        trans_affine(const double* src, const double* dst)
+        {
+            parl_to_parl(src, dst);
+        }
+
+        //---------------------------------- Parellelogram transformations
+        // transform a parallelogram to another one. Src and dst are 
+        // pointers to arrays of three points (double[6], x1,y1,...) that 
+        // identify three corners of the parallelograms assuming implicit 
+        // fourth point. The arguments are arrays of double[6] mapped 
+        // to x1,y1, x2,y2, x3,y3  where the coordinates are:
+        //        *-----------------*
+        //       /          (x3,y3)/
+        //      /                 /
+        //     /(x1,y1)   (x2,y2)/
+        //    *-----------------*
+        const trans_affine& parl_to_parl(const double* src, 
+                                         const double* dst);
+
+        const trans_affine& rect_to_parl(double x1, double y1, 
+                                         double x2, double y2, 
+                                         const double* parl);
+
+        const trans_affine& parl_to_rect(const double* parl, 
+                                         double x1, double y1, 
+                                         double x2, double y2);
+
+
+        //------------------------------------------ Operations
+        // Reset - load an identity matrix
+        const trans_affine& reset();
+
+        // Direct transformations operations
+        const trans_affine& translate(double x, double y);
+        const trans_affine& rotate(double a);
+        const trans_affine& scale(double s);
+        const trans_affine& scale(double x, double y);
+
+        // Multiply matrix to another one
+        const trans_affine& multiply(const trans_affine& m);
+
+        // Multiply "m" to "this" and assign the result to "this"
+        const trans_affine& premultiply(const trans_affine& m);
+
+        // Multiply matrix to inverse of another one
+        const trans_affine& multiply_inv(const trans_affine& m);
+
+        // Multiply inverse of "m" to "this" and assign the result to "this"
+        const trans_affine& premultiply_inv(const trans_affine& m);
+
+        // Invert matrix. Do not try to invert degenerate matrices, 
+        // there's no check for validity. If you set scale to 0 and 
+        // then try to invert matrix, expect unpredictable result.
+        const trans_affine& invert();
+
+        // Mirroring around X
+        const trans_affine& flip_x();
+
+        // Mirroring around Y
+        const trans_affine& flip_y();
+
+        //------------------------------------------- Load/Store
+        // Store matrix to an array [6] of double
+        void store_to(double* m) const
+        {
+            *m++ = sx; *m++ = shy; *m++ = shx; *m++ = sy; *m++ = tx; *m++ = ty;
+        }
+
+        // Load matrix from an array [6] of double
+        const trans_affine& load_from(const double* m)
+        {
+            sx = *m++; shy = *m++; shx = *m++; sy = *m++; tx = *m++;  ty = *m++;
+            return *this;
+        }
+
+        //------------------------------------------- Operators
+        
+        // Multiply the matrix by another one
+        const trans_affine& operator *= (const trans_affine& m)
+        {
+            return multiply(m);
+        }
+
+        // Multiply the matrix by inverse of another one
+        const trans_affine& operator /= (const trans_affine& m)
+        {
+            return multiply_inv(m);
+        }
+
+        // Multiply the matrix by another one and return
+        // the result in a separete matrix.
+        trans_affine operator * (const trans_affine& m) const
+        {
+            return trans_affine(*this).multiply(m);
+        }
+
+        // Multiply the matrix by inverse of another one 
+        // and return the result in a separete matrix.
+        trans_affine operator / (const trans_affine& m) const
+        {
+            return trans_affine(*this).multiply_inv(m);
+        }
+
+        // Calculate and return the inverse matrix
+        trans_affine operator ~ () const
+        {
+            trans_affine ret = *this;
+            return ret.invert();
+        }
+
+        // Equal operator with default epsilon
+        bool operator == (const trans_affine& m) const
+        {
+            return is_equal(m, affine_epsilon);
+        }
+
+        // Not Equal operator with default epsilon
+        bool operator != (const trans_affine& m) const
+        {
+            return !is_equal(m, affine_epsilon);
+        }
+
+        //-------------------------------------------- Transformations
+        // Direct transformation of x and y
+        void transform(double* x, double* y) const;
+
+        // Direct transformation of x and y, 2x2 matrix only, no translation
+        void transform_2x2(double* x, double* y) const;
+
+        // Inverse transformation of x and y. It works slower than the 
+        // direct transformation. For massive operations it's better to 
+        // invert() the matrix and then use direct transformations. 
+        void inverse_transform(double* x, double* y) const;
+
+        //-------------------------------------------- Auxiliary
+        // Calculate the determinant of matrix
+        double determinant() const
+        {
+            return sx * sy - shy * shx;
+        }
+
+        // Calculate the reciprocal of the determinant
+        double determinant_reciprocal() const
+        {
+            return 1.0 / (sx * sy - shy * shx);
+        }
+
+        // Get the average scale (by X and Y). 
+        // Basically used to calculate the approximation_scale when
+        // decomposinting curves into line segments.
+        double scale() const;
+
+        // Check to see if the matrix is not degenerate
+        bool is_valid(double epsilon = affine_epsilon) const;
+
+        // Check to see if it's an identity matrix
+        bool is_identity(double epsilon = affine_epsilon) const;
+
+        // Check to see if two matrices are equal
+        bool is_equal(const trans_affine& m, double epsilon = affine_epsilon) const;
+
+        // Determine the major parameters. Use with caution considering 
+        // possible degenerate cases.
+        double rotation() const;
+        void   translation(double* dx, double* dy) const;
+        void   scaling(double* x, double* y) const;
+        void   scaling_abs(double* x, double* y) const;
+    };
+
+    //------------------------------------------------------------------------
+    inline void trans_affine::transform(double* x, double* y) const
+    {
+        double tmp = *x;
+        *x = tmp * sx  + *y * shx + tx;
+        *y = tmp * shy + *y * sy  + ty;
+    }
+
+    //------------------------------------------------------------------------
+    inline void trans_affine::transform_2x2(double* x, double* y) const
+    {
+        double tmp = *x;
+        *x = tmp * sx  + *y * shx;
+        *y = tmp * shy + *y * sy;
+    }
+
+    //------------------------------------------------------------------------
+    inline void trans_affine::inverse_transform(double* x, double* y) const
+    {
+        double d = determinant_reciprocal();
+        double a = (*x - tx) * d;
+        double b = (*y - ty) * d;
+        *x = a * sy - b * shx;
+        *y = b * sx - a * shy;
+    }
+
+    //------------------------------------------------------------------------
+    inline double trans_affine::scale() const
+    {
+        double x = 0.707106781 * sx  + 0.707106781 * shx;
+        double y = 0.707106781 * shy + 0.707106781 * sy;
+        return sqrt(x*x + y*y);
+    }
+
+    //------------------------------------------------------------------------
+    inline const trans_affine& trans_affine::translate(double x, double y) 
+    { 
+        tx += x;
+        ty += y; 
+        return *this;
+    }
+
+    //------------------------------------------------------------------------
+    inline const trans_affine& trans_affine::rotate(double a) 
+    {
+        double ca = cos(a); 
+        double sa = sin(a);
+        double t0 = sx  * ca - shy * sa;
+        double t2 = shx * ca - sy * sa;
+        double t4 = tx  * ca - ty * sa;
+        shy = sx  * sa + shy * ca;
+        sy  = shx * sa + sy * ca; 
+        ty  = tx  * sa + ty * ca;
+        sx  = t0;
+        shx = t2;
+        tx  = t4;
+        return *this;
+    }
+
+    //------------------------------------------------------------------------
+    inline const trans_affine& trans_affine::scale(double x, double y) 
+    {
+        double mm0 = x; // Possible hint for the optimizer
+        double mm3 = y; 
+        sx  *= mm0;
+        shx *= mm0;
+        tx  *= mm0;
+        shy *= mm3;
+        sy  *= mm3;
+        ty  *= mm3;
+        return *this;
+    }
+
+    //------------------------------------------------------------------------
+    inline const trans_affine& trans_affine::scale(double s) 
+    {
+        double m = s; // Possible hint for the optimizer
+        sx  *= m;
+        shx *= m;
+        tx  *= m;
+        shy *= m;
+        sy  *= m;
+        ty  *= m;
+        return *this;
+    }
+
+    //------------------------------------------------------------------------
+    inline const trans_affine& trans_affine::premultiply(const trans_affine& m)
+    {
+        trans_affine t = m;
+        return *this = t.multiply(*this);
+    }
+
+    //------------------------------------------------------------------------
+    inline const trans_affine& trans_affine::multiply_inv(const trans_affine& m)
+    {
+        trans_affine t = m;
+        t.invert();
+        return multiply(t);
+    }
+
+    //------------------------------------------------------------------------
+    inline const trans_affine& trans_affine::premultiply_inv(const trans_affine& m)
+    {
+        trans_affine t = m;
+        t.invert();
+        return *this = t.multiply(*this);
+    }
+
+    //------------------------------------------------------------------------
+    inline void trans_affine::scaling_abs(double* x, double* y) const
+    {
+        // Used to calculate scaling coefficients in image resampling. 
+        // When there is considerable shear this method gives us much
+        // better estimation than just sx, sy.
+        *x = sqrt(sx  * sx  + shx * shx);
+        *y = sqrt(shy * shy + sy  * sy);
+    }
+
+    //====================================================trans_affine_rotation
+    // Rotation matrix. sin() and cos() are calculated twice for the same angle.
+    // There's no harm because the performance of sin()/cos() is very good on all
+    // modern processors. Besides, this operation is not going to be invoked too 
+    // often.
+    class trans_affine_rotation : public trans_affine
+    {
+    public:
+        trans_affine_rotation(double a) : 
+          trans_affine(cos(a), sin(a), -sin(a), cos(a), 0.0, 0.0)
+        {}
+    };
+
+    //====================================================trans_affine_scaling
+    // Scaling matrix. x, y - scale coefficients by X and Y respectively
+    class trans_affine_scaling : public trans_affine
+    {
+    public:
+        trans_affine_scaling(double x, double y) : 
+          trans_affine(x, 0.0, 0.0, y, 0.0, 0.0)
+        {}
+
+        trans_affine_scaling(double s) : 
+          trans_affine(s, 0.0, 0.0, s, 0.0, 0.0)
+        {}
+    };
+
+    //================================================trans_affine_translation
+    // Translation matrix
+    class trans_affine_translation : public trans_affine
+    {
+    public:
+        trans_affine_translation(double x, double y) : 
+          trans_affine(1.0, 0.0, 0.0, 1.0, x, y)
+        {}
+    };
+
+    //====================================================trans_affine_skewing
+    // Sckewing (shear) matrix
+    class trans_affine_skewing : public trans_affine
+    {
+    public:
+        trans_affine_skewing(double x, double y) : 
+          trans_affine(1.0, tan(y), tan(x), 1.0, 0.0, 0.0)
+        {}
+    };
+
+
+    //===============================================trans_affine_line_segment
+    // Rotate, Scale and Translate, associating 0...dist with line segment 
+    // x1,y1,x2,y2
+    class trans_affine_line_segment : public trans_affine
+    {
+    public:
+        trans_affine_line_segment(double x1, double y1, double x2, double y2, 
+                                  double dist)
+        {
+            double dx = x2 - x1;
+            double dy = y2 - y1;
+            if(dist > 0.0)
+            {
+                multiply(trans_affine_scaling(sqrt(dx * dx + dy * dy) / dist));
+            }
+            multiply(trans_affine_rotation(atan2(dy, dx)));
+            multiply(trans_affine_translation(x1, y1));
+        }
+    };
+
+
+    //============================================trans_affine_reflection_unit
+    // Reflection matrix. Reflect coordinates across the line through 
+    // the origin containing the unit vector (ux, uy).
+    // Contributed by John Horigan
+    class trans_affine_reflection_unit : public trans_affine
+    {
+    public:
+        trans_affine_reflection_unit(double ux, double uy) :
+          trans_affine(2.0 * ux * ux - 1.0, 
+                       2.0 * ux * uy, 
+                       2.0 * ux * uy, 
+                       2.0 * uy * uy - 1.0, 
+                       0.0, 0.0)
+        {}
+    };
+
+
+    //=================================================trans_affine_reflection
+    // Reflection matrix. Reflect coordinates across the line through 
+    // the origin at the angle a or containing the non-unit vector (x, y).
+    // Contributed by John Horigan
+    class trans_affine_reflection : public trans_affine_reflection_unit
+    {
+    public:
+        trans_affine_reflection(double a) :
+          trans_affine_reflection_unit(cos(a), sin(a))
+        {}
+
+
+        trans_affine_reflection(double x, double y) :
+          trans_affine_reflection_unit(x / sqrt(x * x + y * y), y / sqrt(x * x + y * y))
+        {}
+    };
+
+}
+
+
+#endif
+

3rd/agg/include/agg_trans_viewport.h

@@ -0,0 +1,303 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// Viewport transformer - simple orthogonal conversions from world coordinates
+//                        to screen (device) ones.
+//
+//----------------------------------------------------------------------------
+
+#ifndef AGG_TRANS_VIEWPORT_INCLUDED
+#define AGG_TRANS_VIEWPORT_INCLUDED
+
+#include <string.h>
+#include "agg_trans_affine.h"
+
+
+namespace agg
+{
+
+    enum aspect_ratio_e
+    {
+        aspect_ratio_stretch,
+        aspect_ratio_meet,
+        aspect_ratio_slice
+    };
+
+
+    //----------------------------------------------------------trans_viewport
+    class trans_viewport
+    {
+    public:
+        //-------------------------------------------------------------------
+        trans_viewport() : 
+            m_world_x1(0.0),
+            m_world_y1(0.0),
+            m_world_x2(1.0),
+            m_world_y2(1.0),
+            m_device_x1(0.0),
+            m_device_y1(0.0),
+            m_device_x2(1.0),
+            m_device_y2(1.0),
+            m_aspect(aspect_ratio_stretch),
+            m_is_valid(true),
+            m_align_x(0.5),
+            m_align_y(0.5),
+            m_wx1(0.0),
+            m_wy1(0.0),
+            m_wx2(1.0),
+            m_wy2(1.0),
+            m_dx1(0.0),
+            m_dy1(0.0),
+            m_kx(1.0),
+            m_ky(1.0)
+        {}
+
+        //-------------------------------------------------------------------
+        void preserve_aspect_ratio(double alignx, 
+                                   double aligny, 
+                                   aspect_ratio_e aspect)
+        {
+            m_align_x = alignx;
+            m_align_y = aligny;
+            m_aspect  = aspect;
+            update();
+        }
+
+        //-------------------------------------------------------------------
+        void device_viewport(double x1, double y1, double x2, double y2)
+        {
+            m_device_x1 = x1;
+            m_device_y1 = y1;
+            m_device_x2 = x2;
+            m_device_y2 = y2;
+            update();
+        }
+
+        //-------------------------------------------------------------------
+        void world_viewport(double x1, double y1, double x2, double y2)
+        {
+            m_world_x1 = x1;
+            m_world_y1 = y1;
+            m_world_x2 = x2;
+            m_world_y2 = y2;
+            update();
+        }
+
+        //-------------------------------------------------------------------
+        void device_viewport(double* x1, double* y1, double* x2, double* y2) const
+        {
+            *x1 = m_device_x1;
+            *y1 = m_device_y1;
+            *x2 = m_device_x2;
+            *y2 = m_device_y2;
+        }
+
+        //-------------------------------------------------------------------
+        void world_viewport(double* x1, double* y1, double* x2, double* y2) const
+        {
+            *x1 = m_world_x1;
+            *y1 = m_world_y1;
+            *x2 = m_world_x2;
+            *y2 = m_world_y2;
+        }
+
+        //-------------------------------------------------------------------
+        void world_viewport_actual(double* x1, double* y1, 
+                                   double* x2, double* y2) const
+        {
+            *x1 = m_wx1;
+            *y1 = m_wy1;
+            *x2 = m_wx2;
+            *y2 = m_wy2;
+        }
+
+        //-------------------------------------------------------------------
+        bool   is_valid()             const { return m_is_valid; }
+        double align_x()              const { return m_align_x; }
+        double align_y()              const { return m_align_y; }
+        aspect_ratio_e aspect_ratio() const { return m_aspect; }
+
+        //-------------------------------------------------------------------
+        void transform(double* x, double* y) const
+        {
+            *x = (*x - m_wx1) * m_kx + m_dx1;
+            *y = (*y - m_wy1) * m_ky + m_dy1;
+        }
+
+        //-------------------------------------------------------------------
+        void transform_scale_only(double* x, double* y) const
+        {
+            *x *= m_kx;
+            *y *= m_ky;
+        }
+
+        //-------------------------------------------------------------------
+        void inverse_transform(double* x, double* y) const
+        {
+            *x = (*x - m_dx1) / m_kx + m_wx1;
+            *y = (*y - m_dy1) / m_ky + m_wy1;
+        }
+
+        //-------------------------------------------------------------------
+        void inverse_transform_scale_only(double* x, double* y) const
+        {
+            *x /= m_kx;
+            *y /= m_ky;
+        }
+
+        //-------------------------------------------------------------------
+        double device_dx() const { return m_dx1 - m_wx1 * m_kx; }
+        double device_dy() const { return m_dy1 - m_wy1 * m_ky; }
+
+        //-------------------------------------------------------------------
+        double scale_x() const
+        {
+            return m_kx;
+        }
+
+        //-------------------------------------------------------------------
+        double scale_y() const
+        {
+            return m_ky;
+        }
+
+        //-------------------------------------------------------------------
+        double scale() const
+        {
+            return (m_kx + m_ky) * 0.5;
+        }
+
+        //-------------------------------------------------------------------
+        trans_affine to_affine() const
+        {
+            trans_affine mtx = trans_affine_translation(-m_wx1, -m_wy1);
+            mtx *= trans_affine_scaling(m_kx, m_ky);
+            mtx *= trans_affine_translation(m_dx1, m_dy1);
+            return mtx;
+        }
+
+        //-------------------------------------------------------------------
+        trans_affine to_affine_scale_only() const
+        {
+            return trans_affine_scaling(m_kx, m_ky);
+        }
+
+        //-------------------------------------------------------------------
+        unsigned byte_size() const
+        {
+            return sizeof(*this);
+        }
+
+        void serialize(int8u* ptr) const
+        {
+            memcpy(ptr, this, sizeof(*this)); 
+        }
+
+        void deserialize(const int8u* ptr)
+        {
+            memcpy(this,  ptr, sizeof(*this));
+        }
+
+    private:
+        void update();
+
+        double         m_world_x1;
+        double         m_world_y1;
+        double         m_world_x2;
+        double         m_world_y2;
+        double         m_device_x1;
+        double         m_device_y1;
+        double         m_device_x2;
+        double         m_device_y2;
+        aspect_ratio_e m_aspect;
+        bool           m_is_valid;
+        double         m_align_x;
+        double         m_align_y;
+        double         m_wx1;
+        double         m_wy1;
+        double         m_wx2;
+        double         m_wy2;
+        double         m_dx1;
+        double         m_dy1;
+        double         m_kx;
+        double         m_ky;
+    };
+
+
+
+    //-----------------------------------------------------------------------
+    inline void trans_viewport::update()
+    {
+        const double epsilon = 1e-30;
+        if(fabs(m_world_x1  - m_world_x2)  < epsilon ||
+           fabs(m_world_y1  - m_world_y2)  < epsilon ||
+           fabs(m_device_x1 - m_device_x2) < epsilon ||
+           fabs(m_device_y1 - m_device_y2) < epsilon)
+        {
+            m_wx1 = m_world_x1;
+            m_wy1 = m_world_y1;
+            m_wx2 = m_world_x1 + 1.0;
+            m_wy2 = m_world_y2 + 1.0;
+            m_dx1 = m_device_x1;
+            m_dy1 = m_device_y1;
+            m_kx  = 1.0;
+            m_ky  = 1.0;
+            m_is_valid = false;
+            return;
+        }
+
+        double world_x1  = m_world_x1;
+        double world_y1  = m_world_y1;
+        double world_x2  = m_world_x2;
+        double world_y2  = m_world_y2;
+        double device_x1 = m_device_x1;
+        double device_y1 = m_device_y1;
+        double device_x2 = m_device_x2;
+        double device_y2 = m_device_y2;
+        if(m_aspect != aspect_ratio_stretch)
+        {
+            double d;
+            m_kx = (device_x2 - device_x1) / (world_x2 - world_x1);
+            m_ky = (device_y2 - device_y1) / (world_y2 - world_y1);
+
+            if((m_aspect == aspect_ratio_meet) == (m_kx < m_ky))
+            {
+                d         = (world_y2 - world_y1) * m_ky / m_kx;
+                world_y1 += (world_y2 - world_y1 - d) * m_align_y;
+                world_y2  =  world_y1 + d;
+            }
+            else
+            {
+                d         = (world_x2 - world_x1) * m_kx / m_ky;
+                world_x1 += (world_x2 - world_x1 - d) * m_align_x;
+                world_x2  =  world_x1 + d;
+            }
+        }
+        m_wx1 = world_x1;
+        m_wy1 = world_y1;
+        m_wx2 = world_x2;
+        m_wy2 = world_y2;
+        m_dx1 = device_x1;
+        m_dy1 = device_y1;
+        m_kx  = (device_x2 - device_x1) / (world_x2 - world_x1);
+        m_ky  = (device_y2 - device_y1) / (world_y2 - world_y1);
+        m_is_valid = true;
+    }
+
+
+}
+
+
+#endif

3rd/agg/include/agg_vcgen_stroke.h

@@ -0,0 +1,102 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+
+#ifndef AGG_VCGEN_STROKE_INCLUDED
+#define AGG_VCGEN_STROKE_INCLUDED
+
+#include "agg_math_stroke.h"
+
+
+namespace agg
+{
+
+    //============================================================vcgen_stroke
+    //
+    // See Implementation agg_vcgen_stroke.cpp
+    // Stroke generator
+    //
+    //------------------------------------------------------------------------
+    class vcgen_stroke
+    {
+        enum status_e
+        {
+            initial,
+            ready,
+            cap1,
+            cap2,
+            outline1,
+            close_first,
+            outline2,
+            out_vertices,
+            end_poly1,
+            end_poly2,
+            stop
+        };
+
+    public:
+        typedef vertex_sequence<vertex_dist, 6> vertex_storage;
+        typedef pod_bvector<point_d, 6>         coord_storage;
+
+        vcgen_stroke();
+
+        void line_cap(line_cap_e lc)     { m_stroker.line_cap(lc); }
+        void line_join(line_join_e lj)   { m_stroker.line_join(lj); }
+        void inner_join(inner_join_e ij) { m_stroker.inner_join(ij); }
+
+        line_cap_e   line_cap()   const { return m_stroker.line_cap(); }
+        line_join_e  line_join()  const { return m_stroker.line_join(); }
+        inner_join_e inner_join() const { return m_stroker.inner_join(); }
+
+        void width(double w) { m_stroker.width(w); }
+        void miter_limit(double ml) { m_stroker.miter_limit(ml); }
+        void miter_limit_theta(double t) { m_stroker.miter_limit_theta(t); }
+        void inner_miter_limit(double ml) { m_stroker.inner_miter_limit(ml); }
+        void approximation_scale(double as) { m_stroker.approximation_scale(as); }
+
+        double width() const { return m_stroker.width(); }
+        double miter_limit() const { return m_stroker.miter_limit(); }
+        double inner_miter_limit() const { return m_stroker.inner_miter_limit(); }
+        double approximation_scale() const { return m_stroker.approximation_scale(); }
+
+        void shorten(double s) { m_shorten = s; }
+        double shorten() const { return m_shorten; }
+
+        // Vertex Generator Interface
+        void remove_all();
+        void add_vertex(double x, double y, unsigned cmd);
+
+        // Vertex Source Interface
+        void     rewind(unsigned path_id);
+        unsigned vertex(double* x, double* y);
+
+    private:
+        vcgen_stroke(const vcgen_stroke&);
+        const vcgen_stroke& operator = (const vcgen_stroke&);
+
+        math_stroke<coord_storage> m_stroker;
+        vertex_storage             m_src_vertices;
+        coord_storage              m_out_vertices;
+        double                     m_shorten;
+        unsigned                   m_closed;
+        status_e                   m_status;
+        status_e                   m_prev_status;
+        unsigned                   m_src_vertex;
+        unsigned                   m_out_vertex;
+    };
+
+
+}
+
+#endif

3rd/agg/include/agg_vertex_sequence.h

@@ -0,0 +1,172 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// vertex_sequence container and vertex_dist struct
+//
+//----------------------------------------------------------------------------
+#ifndef AGG_VERTEX_SEQUENCE_INCLUDED
+#define AGG_VERTEX_SEQUENCE_INCLUDED
+
+#include "agg_basics.h"
+#include "agg_array.h"
+#include "agg_math.h"
+
+namespace agg
+{
+
+    //----------------------------------------------------------vertex_sequence
+    // Modified agg::pod_bvector. The data is interpreted as a sequence 
+    // of vertices. It means that the type T must expose:
+    //
+    // bool T::operator() (const T& val)
+    // 
+    // that is called every time new vertex is being added. The main purpose
+    // of this operator is the possibility to calculate some values during 
+    // adding and to return true if the vertex fits some criteria or false if
+    // it doesn't. In the last case the new vertex is not added. 
+    // 
+    // The simple example is filtering coinciding vertices with calculation 
+    // of the distance between the current and previous ones:
+    //
+    //    struct vertex_dist
+    //    {
+    //        double   x;
+    //        double   y;
+    //        double   dist;
+    //
+    //        vertex_dist() {}
+    //        vertex_dist(double x_, double y_) :
+    //            x(x_),
+    //            y(y_),
+    //            dist(0.0)
+    //        {
+    //        }
+    //
+    //        bool operator () (const vertex_dist& val)
+    //        {
+    //            return (dist = calc_distance(x, y, val.x, val.y)) > EPSILON;
+    //        }
+    //    };
+    //
+    // Function close() calls this operator and removes the last vertex if 
+    // necessary.
+    //------------------------------------------------------------------------
+    template<class T, unsigned S=6> 
+    class vertex_sequence : public pod_bvector<T, S>
+    {
+    public:
+        typedef pod_bvector<T, S> base_type;
+
+        void add(const T& val);
+        void modify_last(const T& val);
+        void close(bool remove_flag);
+    };
+
+
+
+    //------------------------------------------------------------------------
+    template<class T, unsigned S> 
+    void vertex_sequence<T, S>::add(const T& val)
+    {
+        if(base_type::size() > 1)
+        {
+            if(!(*this)[base_type::size() - 2]((*this)[base_type::size() - 1])) 
+            {
+                base_type::remove_last();
+            }
+        }
+        base_type::add(val);
+    }
+
+
+    //------------------------------------------------------------------------
+    template<class T, unsigned S> 
+    void vertex_sequence<T, S>::modify_last(const T& val)
+    {
+        base_type::remove_last();
+        add(val);
+    }
+
+
+
+    //------------------------------------------------------------------------
+    template<class T, unsigned S> 
+    void vertex_sequence<T, S>::close(bool closed)
+    {
+        while(base_type::size() > 1)
+        {
+            if((*this)[base_type::size() - 2]((*this)[base_type::size() - 1])) break;
+            T t = (*this)[base_type::size() - 1];
+            base_type::remove_last();
+            modify_last(t);
+        }
+
+        if(closed)
+        {
+            while(base_type::size() > 1)
+            {
+                if((*this)[base_type::size() - 1]((*this)[0])) break;
+                base_type::remove_last();
+            }
+        }
+    }
+
+
+    //-------------------------------------------------------------vertex_dist
+    // Vertex (x, y) with the distance to the next one. The last vertex has 
+    // distance between the last and the first points if the polygon is closed
+    // and 0.0 if it's a polyline.
+    struct vertex_dist
+    {
+        double   x;
+        double   y;
+        double   dist;
+
+        vertex_dist() {}
+        vertex_dist(double x_, double y_) :
+            x(x_),
+            y(y_),
+            dist(0.0)
+        {
+        }
+
+        bool operator () (const vertex_dist& val)
+        {
+            bool ret = (dist = calc_distance(x, y, val.x, val.y)) > vertex_dist_epsilon;
+            if(!ret) dist = 1.0 / vertex_dist_epsilon;
+            return ret;
+        }
+    };
+
+
+
+    //--------------------------------------------------------vertex_dist_cmd
+    // Save as the above but with additional "command" value
+    struct vertex_dist_cmd : public vertex_dist
+    {
+        unsigned cmd;
+
+        vertex_dist_cmd() {}
+        vertex_dist_cmd(double x_, double y_, unsigned cmd_) :
+            vertex_dist(x_, y_),
+            cmd(cmd_)
+        {
+        }
+    };
+
+
+}
+
+#endif

3rd/agg/src/agg_color_rgba.cpp

@@ -0,0 +1,17 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2009 John Horigan (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+//
+// Contact: john@glyphic.com.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+
+// rgbaN construction from grayN types is no longer required,
+// as grayN types now define their own conversions to rgbaN.

3rd/agg/src/agg_image_filters.cpp

@@ -0,0 +1,103 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// Filtering class image_filter_lut implemantation
+//
+//----------------------------------------------------------------------------
+
+
+#include "agg_image_filters.h"
+
+
+namespace agg
+{
+    //--------------------------------------------------------------------
+    void image_filter_lut::realloc_lut(double radius)
+    {
+        m_radius = radius;
+        m_diameter = uceil(radius) * 2;
+        m_start = -int(m_diameter / 2 - 1);
+        unsigned size = m_diameter << image_subpixel_shift;
+        if(size > m_weight_array.size())
+        {
+            m_weight_array.resize(size);
+        }
+    }
+
+
+
+    //--------------------------------------------------------------------
+    // This function normalizes integer values and corrects the rounding 
+    // errors. It doesn't do anything with the source floating point values
+    // (m_weight_array_dbl), it corrects only integers according to the rule 
+    // of 1.0 which means that any sum of pixel weights must be equal to 1.0.
+    // So, the filter function must produce a graph of the proper shape.
+    //--------------------------------------------------------------------
+    void image_filter_lut::normalize()
+    {
+        unsigned i;
+        int flip = 1;
+
+        for(i = 0; i < image_subpixel_scale; i++)
+        {
+            for(;;)
+            {
+                int sum = 0;
+                unsigned j;
+                for(j = 0; j < m_diameter; j++)
+                {
+                    sum += m_weight_array[j * image_subpixel_scale + i];
+                }
+
+                if(sum == image_filter_scale) break;
+
+                double k = double(image_filter_scale) / double(sum);
+                sum = 0;
+                for(j = 0; j < m_diameter; j++)
+                {
+                    sum +=     m_weight_array[j * image_subpixel_scale + i] = 
+                        iround(m_weight_array[j * image_subpixel_scale + i] * k);
+                }
+
+                sum -= image_filter_scale;
+                int inc = (sum > 0) ? -1 : 1;
+
+                for(j = 0; j < m_diameter && sum; j++)
+                {
+                    flip ^= 1;
+                    unsigned idx = flip ? m_diameter/2 + j/2 : m_diameter/2 - j/2;
+                    int v = m_weight_array[idx * image_subpixel_scale + i];
+                    if(v < image_filter_scale)
+                    {
+                        m_weight_array[idx * image_subpixel_scale + i] += inc;
+                        sum += inc;
+                    }
+                }
+            }
+        }
+
+        unsigned pivot = m_diameter << (image_subpixel_shift - 1);
+
+        for(i = 0; i < pivot; i++)
+        {
+            m_weight_array[pivot + i] = m_weight_array[pivot - i];
+        }
+        unsigned end = (diameter() << image_subpixel_shift) - 1;
+        m_weight_array[0] = m_weight_array[end];
+    }
+
+
+}
+

3rd/agg/src/agg_sqrt_tables.cpp

@@ -0,0 +1,115 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// static tables for fast integer sqrt
+//
+//----------------------------------------------------------------------------
+
+#include "agg_basics.h"
+
+namespace agg
+{
+    int16u g_sqrt_table[1024] =                       //----------g_sqrt_table
+    {
+        0,
+        2048,2896,3547,4096,4579,5017,5418,5793,6144,6476,6792,7094,7384,7663,7932,8192,8444,
+        8689,8927,9159,9385,9606,9822,10033,10240,10443,10642,10837,11029,11217,11403,11585,
+        11765,11942,12116,12288,12457,12625,12790,12953,13114,13273,13430,13585,13738,13890,
+        14040,14189,14336,14482,14626,14768,14910,15050,15188,15326,15462,15597,15731,15864,
+        15995,16126,16255,16384,16512,16638,16764,16888,17012,17135,17257,17378,17498,17618,
+        17736,17854,17971,18087,18203,18318,18432,18545,18658,18770,18882,18992,19102,19212,
+        19321,19429,19537,19644,19750,19856,19961,20066,20170,20274,20377,20480,20582,20684,
+        20785,20886,20986,21085,21185,21283,21382,21480,21577,21674,21771,21867,21962,22058,
+        22153,22247,22341,22435,22528,22621,22713,22806,22897,22989,23080,23170,23261,23351,
+        23440,23530,23619,23707,23796,23884,23971,24059,24146,24232,24319,24405,24491,24576,
+        24661,24746,24831,24915,24999,25083,25166,25249,25332,25415,25497,25580,25661,25743,
+        25824,25905,25986,26067,26147,26227,26307,26387,26466,26545,26624,26703,26781,26859,
+        26937,27015,27092,27170,27247,27324,27400,27477,27553,27629,27705,27780,27856,27931,
+        28006,28081,28155,28230,28304,28378,28452,28525,28599,28672,28745,28818,28891,28963,
+        29035,29108,29180,29251,29323,29394,29466,29537,29608,29678,29749,29819,29890,29960,
+        30030,30099,30169,30238,30308,30377,30446,30515,30583,30652,30720,30788,30856,30924,
+        30992,31059,31127,31194,31261,31328,31395,31462,31529,31595,31661,31727,31794,31859,
+        31925,31991,32056,32122,32187,32252,32317,32382,32446,32511,32575,32640,32704,32768,
+        32832,32896,32959,33023,33086,33150,33213,33276,33339,33402,33465,33527,33590,33652,
+        33714,33776,33839,33900,33962,34024,34086,34147,34208,34270,34331,34392,34453,34514,
+        34574,34635,34695,34756,34816,34876,34936,34996,35056,35116,35176,35235,35295,35354,
+        35413,35472,35531,35590,35649,35708,35767,35825,35884,35942,36001,36059,36117,36175,
+        36233,36291,36348,36406,36464,36521,36578,36636,36693,36750,36807,36864,36921,36978,
+        37034,37091,37147,37204,37260,37316,37372,37429,37485,37540,37596,37652,37708,37763,
+        37819,37874,37929,37985,38040,38095,38150,38205,38260,38315,38369,38424,38478,38533,
+        38587,38642,38696,38750,38804,38858,38912,38966,39020,39073,39127,39181,39234,39287,
+        39341,39394,39447,39500,39553,39606,39659,39712,39765,39818,39870,39923,39975,40028,
+        40080,40132,40185,40237,40289,40341,40393,40445,40497,40548,40600,40652,40703,40755,
+        40806,40857,40909,40960,41011,41062,41113,41164,41215,41266,41317,41368,41418,41469,
+        41519,41570,41620,41671,41721,41771,41821,41871,41922,41972,42021,42071,42121,42171,
+        42221,42270,42320,42369,42419,42468,42518,42567,42616,42665,42714,42763,42813,42861,
+        42910,42959,43008,43057,43105,43154,43203,43251,43300,43348,43396,43445,43493,43541,
+        43589,43637,43685,43733,43781,43829,43877,43925,43972,44020,44068,44115,44163,44210,
+        44258,44305,44352,44400,44447,44494,44541,44588,44635,44682,44729,44776,44823,44869,
+        44916,44963,45009,45056,45103,45149,45195,45242,45288,45334,45381,45427,45473,45519,
+        45565,45611,45657,45703,45749,45795,45840,45886,45932,45977,46023,46069,46114,46160,
+        46205,46250,46296,46341,46386,46431,46477,46522,46567,46612,46657,46702,46746,46791,
+        46836,46881,46926,46970,47015,47059,47104,47149,47193,47237,47282,47326,47370,47415,
+        47459,47503,47547,47591,47635,47679,47723,47767,47811,47855,47899,47942,47986,48030,
+        48074,48117,48161,48204,48248,48291,48335,48378,48421,48465,48508,48551,48594,48637,
+        48680,48723,48766,48809,48852,48895,48938,48981,49024,49067,49109,49152,49195,49237,
+        49280,49322,49365,49407,49450,49492,49535,49577,49619,49661,49704,49746,49788,49830,
+        49872,49914,49956,49998,50040,50082,50124,50166,50207,50249,50291,50332,50374,50416,
+        50457,50499,50540,50582,50623,50665,50706,50747,50789,50830,50871,50912,50954,50995,
+        51036,51077,51118,51159,51200,51241,51282,51323,51364,51404,51445,51486,51527,51567,
+        51608,51649,51689,51730,51770,51811,51851,51892,51932,51972,52013,52053,52093,52134,
+        52174,52214,52254,52294,52334,52374,52414,52454,52494,52534,52574,52614,52654,52694,
+        52734,52773,52813,52853,52892,52932,52972,53011,53051,53090,53130,53169,53209,53248,
+        53287,53327,53366,53405,53445,53484,53523,53562,53601,53640,53679,53719,53758,53797,
+        53836,53874,53913,53952,53991,54030,54069,54108,54146,54185,54224,54262,54301,54340,
+        54378,54417,54455,54494,54532,54571,54609,54647,54686,54724,54762,54801,54839,54877,
+        54915,54954,54992,55030,55068,55106,55144,55182,55220,55258,55296,55334,55372,55410,
+        55447,55485,55523,55561,55599,55636,55674,55712,55749,55787,55824,55862,55900,55937,
+        55975,56012,56049,56087,56124,56162,56199,56236,56273,56311,56348,56385,56422,56459,
+        56497,56534,56571,56608,56645,56682,56719,56756,56793,56830,56867,56903,56940,56977,
+        57014,57051,57087,57124,57161,57198,57234,57271,57307,57344,57381,57417,57454,57490,
+        57527,57563,57599,57636,57672,57709,57745,57781,57817,57854,57890,57926,57962,57999,
+        58035,58071,58107,58143,58179,58215,58251,58287,58323,58359,58395,58431,58467,58503,
+        58538,58574,58610,58646,58682,58717,58753,58789,58824,58860,58896,58931,58967,59002,
+        59038,59073,59109,59144,59180,59215,59251,59286,59321,59357,59392,59427,59463,59498,
+        59533,59568,59603,59639,59674,59709,59744,59779,59814,59849,59884,59919,59954,59989,
+        60024,60059,60094,60129,60164,60199,60233,60268,60303,60338,60373,60407,60442,60477,
+        60511,60546,60581,60615,60650,60684,60719,60753,60788,60822,60857,60891,60926,60960,
+        60995,61029,61063,61098,61132,61166,61201,61235,61269,61303,61338,61372,61406,61440,
+        61474,61508,61542,61576,61610,61644,61678,61712,61746,61780,61814,61848,61882,61916,
+        61950,61984,62018,62051,62085,62119,62153,62186,62220,62254,62287,62321,62355,62388,
+        62422,62456,62489,62523,62556,62590,62623,62657,62690,62724,62757,62790,62824,62857,
+        62891,62924,62957,62991,63024,63057,63090,63124,63157,63190,63223,63256,63289,63323,
+        63356,63389,63422,63455,63488,63521,63554,63587,63620,63653,63686,63719,63752,63785,
+        63817,63850,63883,63916,63949,63982,64014,64047,64080,64113,64145,64178,64211,64243,
+        64276,64309,64341,64374,64406,64439,64471,64504,64536,64569,64601,64634,64666,64699,
+        64731,64763,64796,64828,64861,64893,64925,64957,64990,65022,65054,65086,65119,65151,
+        65183,65215,65247,65279,65312,65344,65376,65408,65440,65472,65504
+    };
+
+
+    int8 g_elder_bit_table[256] =          //---------g_elder_bit_table
+    {
+        0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
+        5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
+        6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
+        6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
+        7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
+        7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
+        7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
+        7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
+    };
+ 
+}

3rd/agg/src/agg_trans_affine.cpp

@@ -0,0 +1,194 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// Affine transformations
+//
+//----------------------------------------------------------------------------
+#include "agg_trans_affine.h"
+
+
+
+namespace agg
+{
+
+    //------------------------------------------------------------------------
+    const trans_affine& trans_affine::parl_to_parl(const double* src, 
+                                                   const double* dst)
+    {
+        sx  = src[2] - src[0];
+        shy = src[3] - src[1];
+        shx = src[4] - src[0];
+        sy  = src[5] - src[1];
+        tx  = src[0];
+        ty  = src[1];
+        invert();
+        multiply(trans_affine(dst[2] - dst[0], dst[3] - dst[1], 
+                              dst[4] - dst[0], dst[5] - dst[1],
+                              dst[0], dst[1]));
+        return *this;
+    }
+
+    //------------------------------------------------------------------------
+    const trans_affine& trans_affine::rect_to_parl(double x1, double y1, 
+                                                   double x2, double y2, 
+                                                   const double* parl)
+    {
+        double src[6];
+        src[0] = x1; src[1] = y1;
+        src[2] = x2; src[3] = y1;
+        src[4] = x2; src[5] = y2;
+        parl_to_parl(src, parl);
+        return *this;
+    }
+
+    //------------------------------------------------------------------------
+    const trans_affine& trans_affine::parl_to_rect(const double* parl, 
+                                                   double x1, double y1, 
+                                                   double x2, double y2)
+    {
+        double dst[6];
+        dst[0] = x1; dst[1] = y1;
+        dst[2] = x2; dst[3] = y1;
+        dst[4] = x2; dst[5] = y2;
+        parl_to_parl(parl, dst);
+        return *this;
+    }
+
+    //------------------------------------------------------------------------
+    const trans_affine& trans_affine::multiply(const trans_affine& m)
+    {
+        double t0 = sx  * m.sx + shy * m.shx;
+        double t2 = shx * m.sx + sy  * m.shx;
+        double t4 = tx  * m.sx + ty  * m.shx + m.tx;
+        shy = sx  * m.shy + shy * m.sy;
+        sy  = shx * m.shy + sy  * m.sy;
+        ty  = tx  * m.shy + ty  * m.sy + m.ty;
+        sx  = t0;
+        shx = t2;
+        tx  = t4;
+        return *this;
+    }
+
+
+    //------------------------------------------------------------------------
+    const trans_affine& trans_affine::invert()
+    {
+        double d  = determinant_reciprocal();
+
+        double t0  =  sy  * d;
+               sy  =  sx  * d;
+               shy = -shy * d;
+               shx = -shx * d;
+
+        double t4 = -tx * t0  - ty * shx;
+               ty = -tx * shy - ty * sy;
+
+        sx = t0;
+        tx = t4;
+        return *this;
+    }
+
+
+   //------------------------------------------------------------------------
+    const trans_affine& trans_affine::flip_x()
+    {
+        sx  = -sx;
+        shy = -shy;
+        tx  = -tx;
+        return *this;
+    }
+
+    //------------------------------------------------------------------------
+    const trans_affine& trans_affine::flip_y()
+    {
+        shx = -shx;
+        sy  = -sy;
+        ty  = -ty;
+        return *this;
+    }
+
+    //------------------------------------------------------------------------
+    const trans_affine& trans_affine::reset()
+    {
+        sx  = sy  = 1.0; 
+        shy = shx = tx = ty = 0.0;
+        return *this;
+    }
+
+    //------------------------------------------------------------------------
+    bool trans_affine::is_identity(double epsilon) const
+    {
+        return is_equal_eps(sx,  1.0, epsilon) &&
+               is_equal_eps(shy, 0.0, epsilon) &&
+               is_equal_eps(shx, 0.0, epsilon) && 
+               is_equal_eps(sy,  1.0, epsilon) &&
+               is_equal_eps(tx,  0.0, epsilon) &&
+               is_equal_eps(ty,  0.0, epsilon);
+    }
+
+    //------------------------------------------------------------------------
+    bool trans_affine::is_valid(double epsilon) const
+    {
+        return fabs(sx) > epsilon && fabs(sy) > epsilon;
+    }
+
+    //------------------------------------------------------------------------
+    bool trans_affine::is_equal(const trans_affine& m, double epsilon) const
+    {
+        return is_equal_eps(sx,  m.sx,  epsilon) &&
+               is_equal_eps(shy, m.shy, epsilon) &&
+               is_equal_eps(shx, m.shx, epsilon) && 
+               is_equal_eps(sy,  m.sy,  epsilon) &&
+               is_equal_eps(tx,  m.tx,  epsilon) &&
+               is_equal_eps(ty,  m.ty,  epsilon);
+    }
+
+    //------------------------------------------------------------------------
+    double trans_affine::rotation() const
+    {
+        double x1 = 0.0;
+        double y1 = 0.0;
+        double x2 = 1.0;
+        double y2 = 0.0;
+        transform(&x1, &y1);
+        transform(&x2, &y2);
+        return atan2(y2-y1, x2-x1);
+    }
+
+    //------------------------------------------------------------------------
+    void trans_affine::translation(double* dx, double* dy) const
+    {
+        *dx = tx;
+        *dy = ty;
+    }
+
+    //------------------------------------------------------------------------
+    void trans_affine::scaling(double* x, double* y) const
+    {
+        double x1 = 0.0;
+        double y1 = 0.0;
+        double x2 = 1.0;
+        double y2 = 1.0;
+        trans_affine t(*this);
+        t *= trans_affine_rotation(-rotation());
+        t.transform(&x1, &y1);
+        t.transform(&x2, &y2);
+        *x = x2 - x1;
+        *y = y2 - y1;
+    }
+
+
+}
+

3rd/agg/src/agg_vcgen_stroke.cpp

@@ -0,0 +1,213 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// Stroke generator
+//
+//----------------------------------------------------------------------------
+#include <math.h>
+#include "agg_vcgen_stroke.h"
+#include "agg_shorten_path.h"
+
+namespace agg
+{
+
+    //------------------------------------------------------------------------
+    vcgen_stroke::vcgen_stroke() :
+        m_stroker(),
+        m_src_vertices(),
+        m_out_vertices(),
+        m_shorten(0.0),
+        m_closed(0),
+        m_status(initial),
+        m_src_vertex(0),
+        m_out_vertex(0)
+    {
+    }
+
+    //------------------------------------------------------------------------
+    void vcgen_stroke::remove_all()
+    {
+        m_src_vertices.remove_all();
+        m_closed = 0;
+        m_status = initial;
+    }
+
+
+    //------------------------------------------------------------------------
+    void vcgen_stroke::add_vertex(double x, double y, unsigned cmd)
+    {
+        m_status = initial;
+        if(is_move_to(cmd))
+        {
+            m_src_vertices.modify_last(vertex_dist(x, y));
+        }
+        else
+        {
+            if(is_vertex(cmd))
+            {
+                m_src_vertices.add(vertex_dist(x, y));
+            }
+            else
+            {
+                m_closed = get_close_flag(cmd);
+            }
+        }
+    }
+
+    //------------------------------------------------------------------------
+    void vcgen_stroke::rewind(unsigned)
+    {
+        if(m_status == initial)
+        {
+            m_src_vertices.close(m_closed != 0);
+            shorten_path(m_src_vertices, m_shorten, m_closed);
+            if(m_src_vertices.size() < 3) m_closed = 0;
+        }
+        m_status = ready;
+        m_src_vertex = 0;
+        m_out_vertex = 0;
+    }
+
+
+    //------------------------------------------------------------------------
+    unsigned vcgen_stroke::vertex(double* x, double* y)
+    {
+        unsigned cmd = path_cmd_line_to;
+        while(!is_stop(cmd))
+        {
+            switch(m_status)
+            {
+            case initial:
+                rewind(0);
+
+            case ready:
+                if(m_src_vertices.size() < 2 + unsigned(m_closed != 0))
+                {
+                    cmd = path_cmd_stop;
+                    break;
+                }
+                m_status = m_closed ? outline1 : cap1;
+                cmd = path_cmd_move_to;
+                m_src_vertex = 0;
+                m_out_vertex = 0;
+                break;
+
+            case cap1:
+                m_stroker.calc_cap(m_out_vertices,
+                                   m_src_vertices[0], 
+                                   m_src_vertices[1], 
+                                   m_src_vertices[0].dist);
+                m_src_vertex = 1;
+                m_prev_status = outline1;
+                m_status = out_vertices;
+                m_out_vertex = 0;
+                break;
+
+            case cap2:
+                m_stroker.calc_cap(m_out_vertices,
+                                   m_src_vertices[m_src_vertices.size() - 1], 
+                                   m_src_vertices[m_src_vertices.size() - 2], 
+                                   m_src_vertices[m_src_vertices.size() - 2].dist);
+                m_prev_status = outline2;
+                m_status = out_vertices;
+                m_out_vertex = 0;
+                break;
+
+            case outline1:
+                if(m_closed)
+                {
+                    if(m_src_vertex >= m_src_vertices.size())
+                    {
+                        m_prev_status = close_first;
+                        m_status = end_poly1;
+                        break;
+                    }
+                }
+                else
+                {
+                    if(m_src_vertex >= m_src_vertices.size() - 1)
+                    {
+                        m_status = cap2;
+                        break;
+                    }
+                }
+                m_stroker.calc_join(m_out_vertices, 
+                                    m_src_vertices.prev(m_src_vertex), 
+                                    m_src_vertices.curr(m_src_vertex), 
+                                    m_src_vertices.next(m_src_vertex), 
+                                    m_src_vertices.prev(m_src_vertex).dist,
+                                    m_src_vertices.curr(m_src_vertex).dist);
+                ++m_src_vertex;
+                m_prev_status = m_status;
+                m_status = out_vertices;
+                m_out_vertex = 0;
+                break;
+
+            case close_first:
+                m_status = outline2;
+                cmd = path_cmd_move_to;
+
+            case outline2:
+                if(m_src_vertex <= unsigned(m_closed == 0))
+                {
+                    m_status = end_poly2;
+                    m_prev_status = stop;
+                    break;
+                }
+
+                --m_src_vertex;
+                m_stroker.calc_join(m_out_vertices,
+                                    m_src_vertices.next(m_src_vertex), 
+                                    m_src_vertices.curr(m_src_vertex), 
+                                    m_src_vertices.prev(m_src_vertex), 
+                                    m_src_vertices.curr(m_src_vertex).dist, 
+                                    m_src_vertices.prev(m_src_vertex).dist);
+
+                m_prev_status = m_status;
+                m_status = out_vertices;
+                m_out_vertex = 0;
+                break;
+
+            case out_vertices:
+                if(m_out_vertex >= m_out_vertices.size())
+                {
+                    m_status = m_prev_status;
+                }
+                else
+                {
+                    const point_d& c = m_out_vertices[m_out_vertex++];
+                    *x = c.x;
+                    *y = c.y;
+                    return cmd;
+                }
+                break;
+
+            case end_poly1:
+                m_status = m_prev_status;
+                return path_cmd_end_poly | path_flags_close | path_flags_ccw;
+
+            case end_poly2:
+                m_status = m_prev_status;
+                return path_cmd_end_poly | path_flags_close | path_flags_cw;
+
+            case stop:
+                cmd = path_cmd_stop;
+                break;
+            }
+        }
+        return cmd;
+    }
+
+}

3rd/agg/sync.py

@@ -26,16 +26,59 @@ def copyFile(src, dst):
         shutil.copyfile(s, d)
 
 H_FILES=[
+  "agg_array.h",
+  "agg_basics.h",
+  "agg_clip_liang_barsky.h",
+  "agg_color_gray.h",
+  "agg_color_rgba.h",
+  "agg_config.h",
+  "agg_conv_adaptor_vcgen.h",
+  "agg_conv_stroke.h",
+  "agg_dda_line.h",
+  "agg_gamma_functions.h",
+  "agg_gamma_lut.h",
+  "agg_image_accessors.h",
+  "agg_image_filters.h",
+  "agg_math.h",
+  "agg_math_stroke.h",
+  "agg_pixfmt_base.h",
+  "agg_pixfmt_rgba.h",
+  "agg_pixfmt_rgb.h",
+  "agg_pixfmt_rgb_packed.h",
+  "agg_rasterizer_cells_aa.h",
+  "agg_rasterizer_scanline_aa.h",
+  "agg_rasterizer_scanline_aa_nogamma.h",
+  "agg_rasterizer_sl_clip.h",
+  "agg_renderer_base.h",
+  "agg_renderer_scanline.h",
+  "agg_rendering_buffer.h",
+  "agg_scanline_u.h",
+  "agg_shorten_path.h",
+  "agg_span_allocator.h",
+  "agg_span_image_filter.h",
+  "agg_span_image_filter_rgba.h",
+  "agg_span_image_filter_rgb.h",
+  "agg_span_interpolator_linear.h",
+  "agg_trans_affine.h",
+  "agg_trans_viewport.h",
+  "agg_vcgen_stroke.h",
+  "agg_vertex_sequence.h"
 ]
 
 for f in H_FILES:
-    src=os.path.join('agg', f);
-    dst=os.path.join('agg', f);
+    src=os.path.join('include', f);
+    dst=os.path.join('include', f);
     copyFile(src, dst)
 
-SRC_FILES=[]
+SRC_FILES=[
+"agg_color_rgba.cpp",
+"agg_image_filters.cpp",
+"agg_sqrt_tables.cpp",
+"agg_trans_affine.cpp",
+"agg_vcgen_stroke.cpp"
+]
 for f in SRC_FILES:
-    src=os.path.join('src/agg', f);
-    dst=os.path.join('agg', f);
+    src=os.path.join('src', f);
+    dst=os.path.join('src', f);
     copyFile(src, dst)
 

3rd/nanovg/README.md

@@ -0,0 +1,13 @@
+# nanovg的backend
+
+nanovg支持下列backend:
+
+* 1.gl 基于OpenGL/GLES实现(nanovg内置)。
+
+* 2.agg 基于agg实现。纯软件实现，渲染效果好，速度较慢，适合没有GPU的嵌入平台。(注意：目前不支持565格式的图片，请勿定义WITH\_BITMAP\_BGR565)。
+
+* 3.agge 基于agg实现。纯软件实现，渲染效果一般，速度较agg快，适合没有GPU的嵌入平台。
+
+* 4.bgfx 基于bgfx实现。支持多种渲染方式(OpenGL/metal/vulkan/DirectX)，推荐在Android、iOS、Linux、MacOS、Windows等平台上使用。
+
+

3rd/nanovg/SConscript

@@ -3,15 +3,26 @@ import os
 env=DefaultEnvironment().Clone()
 LIB_DIR=os.environ['LIB_DIR'];
 BIN_DIR=os.environ['BIN_DIR'];
+
 env.Library(os.path.join(LIB_DIR, 'nanovg'), Glob('base/*.c'))
-env.Library(os.path.join(LIB_DIR, 'nanovg-agge'), Glob('agge/*.cpp'))
 
-env['LIBS'] = ['nanovg-agge', 'nanovg'] + env['LIBS']
+NANOVG_BACKEND=os.environ['NANOVG_BACKEND'];
+if NANOVG_BACKEND == 'AGG':
+  env.Library(os.path.join(LIB_DIR, 'nanovg-agg'), Glob('agg/*.cpp'))
+
+  env['LIBS'] = ['nanovg-agg', 'agg', 'nanovg'] + env['LIBS']
+  env.Program(os.path.join(BIN_DIR, 'agg_stroke'), Glob('demos/agg_stroke.c'));
+  env.Program(os.path.join(BIN_DIR, 'agg_fill'), Glob('demos/agg_fill.c'));
+  env.Program(os.path.join(BIN_DIR, 'agg_draw_image'), Glob('demos/agg_draw_image.c'));
+
+elif NANOVG_BACKEND == 'AGGE':
+  env.Library(os.path.join(LIB_DIR, 'nanovg-agge'), Glob('agge/*.cpp'))
+  
+  env['LIBS'] = ['nanovg-agge', 'agge', 'nanovg'] + env['LIBS']
+  env.Program(os.path.join(BIN_DIR, 'agge_stroke'), Glob('demos/agge_stroke.c'));
+  env.Program(os.path.join(BIN_DIR, 'agge_fill'), Glob('demos/agge_fill.c'));
+  env.Program(os.path.join(BIN_DIR, 'agge_draw_image'), Glob('demos/agge_draw_image.c'));
+elif NANOVG_BACKEND == 'BGFX':
+  print("not supported yet");
 
-env.Program(os.path.join(BIN_DIR, 'agge_stroke'), Glob('demos/agge_stroke.c'));
-env.Program(os.path.join(BIN_DIR, 'agge_fill'), Glob('demos/agge_fill.c'));
-env.Program(os.path.join(BIN_DIR, 'agge_draw_image'), Glob('demos/agge_draw_image.c'));
 
-#env.Program(os.path.join(BIN_DIR, 'agg_stroke'), Glob('demos/agg_stroke.c'));
-#env.Program(os.path.join(BIN_DIR, 'agg_fill'), Glob('demos/agg_fill.c'));
-#env.Program(os.path.join(BIN_DIR, 'agg_draw_image'), Glob('demos/agg_draw_image.c'));

3rd/nanovg/agg/nanovg_agg.cpp

@@ -0,0 +1,434 @@
+#include <math.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include "nanovg_agg.h"
+#include "nanovg_vertex.h"
+
+#include "agg_basics.h"
+#include "agg_conv_stroke.h"
+#include "agg_scanline_u.h"
+#include "agg_pixfmt_rgb.h"
+#include "agg_pixfmt_rgba.h"
+#include "agg_pixfmt_rgb_packed.h"
+
+#include "agg_platform_support.h"
+#include "agg_rendering_buffer.h"
+#include "agg_renderer_scanline.h"
+#include "agg_rasterizer_scanline_aa.h"
+
+#include "agg_image_accessors.h"
+#include "agg_span_allocator.h"
+#include "agg_span_image_filter_rgb.h"
+#include "agg_span_image_filter_rgba.h"
+
+struct AGGNVGtexture {
+  int id;
+  int tex;
+  int width;
+  int height;
+  int type;
+  int flags;
+  const uint8_t* data;
+};
+typedef struct AGGNVGtexture AGGNVGtexture;
+
+struct AGGNVGcontext {
+  AGGNVGcontext() {
+    this->w = 0;
+    this->h = 0;
+    this->data = NULL;
+    this->textures = NULL;
+    this->ntextures = 0;
+    this->ctextures = 0;
+    this->textureId = 0;
+  }
+
+  ~AGGNVGcontext() {
+    free(this->textures);
+    this->textures = NULL;
+  }
+
+  int ntextures;
+  int ctextures;
+  int textureId;
+  AGGNVGtexture* textures;
+
+  /*fill/stroke color*/
+  uint8_t r;
+  uint8_t g;
+  uint8_t b;
+  uint8_t a;
+
+  /*frame buffer*/
+  int32_t w;
+  int32_t h;
+  int32_t stride;
+  uint8_t* data;
+  enum NVGtexture format;
+
+  /*agg related*/
+  agg::rendering_buffer rbuf;
+  agg::rasterizer_scanline_aa<> ras;
+};
+
+static int aggnvg__maxi(int a, int b) {
+  return a > b ? a : b;
+}
+
+static AGGNVGtexture* aggnvg__allocTexture(AGGNVGcontext* agg) {
+  int i;
+  AGGNVGtexture* tex = NULL;
+
+  for (i = 0; i < agg->ntextures; i++) {
+    if (agg->textures[i].id == 0) {
+      tex = &agg->textures[i];
+      break;
+    }
+  }
+
+  if (tex == NULL) {
+    if (agg->ntextures + 1 > agg->ctextures) {
+      AGGNVGtexture* textures;
+      int ctextures =
+          aggnvg__maxi(agg->ntextures + 1, 4) + agg->ctextures / 2;  // 1.5x Overallocate
+      textures = (AGGNVGtexture*)realloc(agg->textures, sizeof(AGGNVGtexture) * ctextures);
+      if (textures == NULL) return NULL;
+      agg->textures = textures;
+      agg->ctextures = ctextures;
+    }
+    tex = &agg->textures[agg->ntextures++];
+  }
+
+  memset(tex, 0, sizeof(*tex));
+  tex->id = ++agg->textureId;
+
+  return tex;
+}
+
+static AGGNVGtexture* aggnvg__findTexture(AGGNVGcontext* agg, int id) {
+  int i;
+  for (i = 0; i < agg->ntextures; i++)
+    if (agg->textures[i].id == id) return &agg->textures[i];
+  return NULL;
+}
+
+static int aggnvg__deleteTexture(AGGNVGcontext* agg, int id) {
+  int i;
+  for (i = 0; i < agg->ntextures; i++) {
+    if (agg->textures[i].id == id) {
+      memset(&agg->textures[i], 0, sizeof(agg->textures[i]));
+      return 1;
+    }
+  }
+  return 0;
+}
+
+static int aggnvg__renderCreate(void* uptr) {
+  NVG_NOTUSED(uptr);
+  return 1;
+}
+
+static int aggnvg__renderCreateTexture(void* uptr, int type, int w, int h, int imageFlags,
+                                        const unsigned char* data) {
+  AGGNVGcontext* agg = (AGGNVGcontext*)uptr;
+  AGGNVGtexture* tex = aggnvg__allocTexture(agg);
+
+  if (tex == NULL) return 0;
+
+  tex->width = w;
+  tex->height = h;
+  tex->type = type;
+  tex->data = data;
+  tex->flags = imageFlags;
+
+  return tex->id;
+}
+
+static int aggnvg__renderDeleteTexture(void* uptr, int image) {
+  AGGNVGcontext* agg = (AGGNVGcontext*)uptr;
+  return aggnvg__deleteTexture(agg, image);
+}
+
+static int aggnvg__renderUpdateTexture(void* uptr, int image, int x, int y, int w, int h,
+                                        const unsigned char* data) {
+  NVG_NOTUSED(x);
+  NVG_NOTUSED(y);
+  NVG_NOTUSED(w);
+  NVG_NOTUSED(h);
+  AGGNVGcontext* agg = (AGGNVGcontext*)uptr;
+  AGGNVGtexture* tex = aggnvg__findTexture(agg, image);
+  if (tex == NULL) return 0;
+
+  tex->data = data;
+
+  return 1;
+}
+
+static int aggnvg__renderGetTextureSize(void* uptr, int image, int* w, int* h) {
+  AGGNVGcontext* agg = (AGGNVGcontext*)uptr;
+  AGGNVGtexture* tex = aggnvg__findTexture(agg, image);
+  if (tex == NULL) return 0;
+  *w = tex->width;
+  *h = tex->height;
+
+  return 1;
+}
+
+static void aggnvg__renderViewport(void* uptr, float width, float height, float devicePixelRatio) {
+  NVG_NOTUSED(uptr);
+  NVG_NOTUSED(width);
+  NVG_NOTUSED(height);
+  NVG_NOTUSED(devicePixelRatio);
+}
+
+static void aggnvg__renderCancel(void* uptr) {
+  NVG_NOTUSED(uptr);
+}
+
+static void aggnvg__renderFlush(void* uptr) {
+  NVG_NOTUSED(uptr);
+}
+
+static void prepareRasterizer(AGGNVGcontext* agg, NVGscissor* scissor, NVGpaint* paint) {
+  agg::rasterizer_scanline_aa<>& ras = agg->ras;
+  agg::rendering_buffer& rbuf = agg->rbuf;
+  float_t clip_w = scissor->extent[0] * 2;
+  float_t clip_h = scissor->extent[1] * 2;
+  float_t clip_x = scissor->xform[4] - scissor->extent[0];
+  float_t clip_y = scissor->xform[5] - scissor->extent[1];
+
+  rbuf.attach(agg->data, agg->w, agg->h, agg->stride);
+
+  ras.reset();
+  if(clip_w > 0 && clip_h > 0) {
+    ras.clip_box(clip_x, clip_y, clip_x+clip_w, clip_y+clip_h);
+  }
+
+  agg->r = paint->innerColor.r * 0xff;
+  agg->g = paint->innerColor.g * 0xff;
+  agg->b = paint->innerColor.b * 0xff;
+  agg->a = paint->innerColor.a * 0xff;
+}
+
+template <typename PixelT>
+void renderPaint(AGGNVGcontext* agg, NVGpaint* paint) {
+  agg::scanline_u8 sl;
+  PixelT pixf(agg->rbuf);
+  agg::span_allocator<agg::rgba8> sa; 
+  agg::renderer_base<PixelT> ren(pixf);
+  agg::rasterizer_scanline_aa<>& ras = agg->ras;
+  
+  if (paint->image > 0) {
+    AGGNVGtexture* tex = aggnvg__findTexture(agg, paint->image);
+    float invxform[6];
+    int32_t img_w = tex->width;
+    int32_t img_h = tex->height;
+    uint8_t* img_data = (uint8_t*)(tex->data);
+    
+    nvgTransformInverse(invxform, paint->xform);
+    agg::trans_affine img_mtx(invxform[0], invxform[1], invxform[2], invxform[3], invxform[4], invxform[5]);
+    agg::span_interpolator_linear<> interpolator(img_mtx);
+
+    switch (tex->type) {
+      case NVG_TEXTURE_RGBA: {
+        agg::rendering_buffer img_rbuf(img_data, img_w, img_h, img_w * 4);
+        agg::pixfmt_rgba32 img_pixf(img_rbuf);
+        agg::span_image_filter_rgba_bilinear_clip<agg::pixfmt_rgba32, agg::span_interpolator_linear<> > sg(img_pixf, agg::rgba(0, 0, 0, 0), interpolator);
+  
+        agg::render_scanlines_aa(ras, sl, ren, sa, sg);
+        break;
+      }
+      case NVG_TEXTURE_BGRA: {
+        agg::rendering_buffer img_rbuf(img_data, img_w, img_h, img_w * 4);
+        agg::pixfmt_bgra32 img_pixf(img_rbuf);
+        agg::span_image_filter_rgba_bilinear_clip<agg::pixfmt_bgra32, agg::span_interpolator_linear<> > sg(img_pixf, agg::rgba(0, 0, 0, 0), interpolator);
+  
+        agg::render_scanlines_aa(ras, sl, ren, sa, sg);
+        break;
+      }
+      case NVG_TEXTURE_BGR565: {
+      /*FIXME:*/
+        assert(!"not supported format");
+        break;
+      }
+      case NVG_TEXTURE_RGB: {
+        agg::rendering_buffer img_rbuf(img_data, img_w, img_h, img_w * 3);
+        agg::pixfmt_rgb24 img_pixf(img_rbuf);
+        agg::span_image_filter_rgb_bilinear_clip<agg::pixfmt_rgb24, agg::span_interpolator_linear<> > sg(img_pixf, agg::rgba(0, 0, 0, 0), interpolator);
+  
+        agg::render_scanlines_aa(ras, sl, ren, sa, sg);
+        break;
+      }
+      case NVG_TEXTURE_BGR: {
+        agg::rendering_buffer img_rbuf(img_data, img_w, img_h, img_w * 3);
+        agg::pixfmt_bgr24 img_pixf(img_rbuf);
+        agg::span_image_filter_rgb_bilinear_clip<agg::pixfmt_bgr24, agg::span_interpolator_linear<> > sg(img_pixf, agg::rgba(0, 0, 0, 0), interpolator);
+  
+        agg::render_scanlines_aa(ras, sl, ren, sa, sg);
+        break;
+      }
+      default: {
+        assert(!"not supported format");
+        break;
+      }
+    }
+  } else {
+    agg::render_scanlines_aa_solid(ras, sl, ren, agg::srgba8(agg->r,agg->g,agg->b, agg->a));
+  }
+
+}
+
+template <typename PixelT>
+void renderFill(void* uptr, NVGpaint* paint, NVGcompositeOperationState compositeOperation,
+                NVGscissor* scissor, float fringe, const float* bounds, const NVGpath* paths,
+                int npaths) {
+  AGGNVGcontext* agg = (AGGNVGcontext*)uptr;
+  
+  prepareRasterizer(agg, scissor, paint);
+  
+  agg::rasterizer_scanline_aa<>& ras = agg->ras;
+
+  ras.reset();
+  for (int i = 0; i < npaths; i++) {
+    const NVGpath* p = paths + i;
+    for (int j = 0; j < p->nfill; j++) {
+      const NVGvertex* v = p->fill + j;
+      if (j == 0) {
+        ras.move_to_d(v->x, v->y);
+      } else {
+        ras.line_to_d(v->x, v->y);
+      }
+    }
+    ras.close_polygon();
+  }
+  
+  ras.sort();
+  renderPaint<PixelT>(agg, paint);
+}
+
+template <typename PixelT>
+void renderStroke(void* uptr, NVGpaint* paint, NVGcompositeOperationState compositeOperation,
+                  NVGscissor* scissor, float fringe, float strokeWidth, const NVGpath* paths,
+                  int npaths) {
+  AGGNVGcontext* agg = (AGGNVGcontext*)uptr;
+  
+  prepareRasterizer(agg, scissor, paint);
+  
+  agg::rasterizer_scanline_aa<>& ras = agg->ras;
+
+  ras.reset();
+  for (int i = 0; i < npaths; i++) {
+    const NVGpath* p = paths + i;
+
+    agg::nanovg_vertex v(p->stroke, p->nstroke);
+    agg::conv_stroke<agg::nanovg_vertex> path(v);
+    path.width(strokeWidth);
+    ras.add_path(path);
+  }
+
+  ras.sort();
+  renderPaint<PixelT>(agg, paint);
+}
+
+template <typename PixelT>
+void renderTriangles(void* uptr, NVGpaint* paint, NVGcompositeOperationState compositeOperation,
+                     NVGscissor* scissor, const NVGvertex* verts, int nverts) {
+}
+
+static void aggnvg__renderDelete(void* uptr) {
+  AGGNVGcontext* agg = (AGGNVGcontext*)uptr;
+  if (agg == NULL) return;
+
+  delete agg;
+}
+
+static void nvgInitAGG(AGGNVGcontext* agg, NVGparams* params, int32_t w, int32_t h,
+                        enum NVGtexture format, uint8_t* data) {
+  agg->w = w;
+  agg->h = h;
+  agg->data = data;
+  agg->format = format;
+  params->renderTriangles = NULL;
+
+  switch (agg->format) {
+    case NVG_TEXTURE_BGRA: {
+      params->renderStroke = renderStroke<agg::pixfmt_bgra32>;
+      params->renderFill = renderFill<agg::pixfmt_bgra32>;
+      agg->stride = w * 4;
+      break;
+    }
+    case NVG_TEXTURE_RGBA: {
+      params->renderStroke = renderStroke<agg::pixfmt_rgba32>;
+      params->renderFill = renderFill<agg::pixfmt_rgba32>;
+      agg->stride = w * 4;
+      break;
+    }
+    case NVG_TEXTURE_BGR: {
+      params->renderStroke = renderStroke<agg::pixfmt_bgr24>;
+      params->renderFill = renderFill<agg::pixfmt_bgr24>;
+      agg->stride = w * 3;
+      break;
+    }
+    case NVG_TEXTURE_RGB: {
+      params->renderStroke = renderStroke<agg::pixfmt_rgb24>;
+      params->renderFill = renderFill<agg::pixfmt_rgb24>;
+      agg->stride = w * 3;
+      break;
+    }
+    case NVG_TEXTURE_BGR565: {
+      params->renderStroke = renderStroke<agg::pixfmt_rgb565>;
+      params->renderFill = renderFill<agg::pixfmt_rgb565>;
+      agg->stride = w * 2;
+      break;
+    }
+    default: {
+      assert(!"not supported format");
+      break;
+    }
+  }
+}
+
+void nvgReinitAgge(NVGcontext* ctx, int32_t w, int32_t h, enum NVGtexture format,
+                   uint8_t* data) {
+  NVGparams* params = nvgGetParams(ctx);
+  AGGNVGcontext* agg = (AGGNVGcontext*)(params->userPtr);
+
+  nvgInitAGG(agg, params, w, h, format, data);
+}
+
+NVGcontext* nvgCreateAGG(int32_t w, int32_t h, enum NVGtexture format, uint8_t* data) {
+  NVGparams params;
+  NVGcontext* ctx = NULL;
+  AGGNVGcontext* agg = new AGGNVGcontext();
+
+  if (agg == NULL) goto error;
+
+  memset(&params, 0, sizeof(params));
+  params.renderCreate = aggnvg__renderCreate;
+  params.renderCreateTexture = aggnvg__renderCreateTexture;
+  params.renderDeleteTexture = aggnvg__renderDeleteTexture;
+  params.renderUpdateTexture = aggnvg__renderUpdateTexture;
+  params.renderGetTextureSize = aggnvg__renderGetTextureSize;
+  params.renderViewport = aggnvg__renderViewport;
+  params.renderCancel = aggnvg__renderCancel;
+  params.renderFlush = aggnvg__renderFlush;
+  params.renderDelete = aggnvg__renderDelete;
+  params.userPtr = agg;
+  params.edgeAntiAlias = 1;
+
+  nvgInitAGG(agg, &params, w, h, format, data);
+
+  ctx = nvgCreateInternal(&params);
+  if (ctx == NULL) goto error;
+
+  return ctx;
+
+error:
+  if (ctx != NULL) nvgDeleteInternal(ctx);
+  return NULL;
+}
+
+void nvgDeleteAGG(NVGcontext* ctx) {
+  nvgDeleteInternal(ctx);
+}

3rd/nanovg/agg/nanovg_agg.h

@@ -0,0 +1,26 @@
+#ifndef NANOVG_AGG_H
+#define NANOVG_AGG_H
+
+#include <math.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include "nanovg.h"
+
+#ifndef M_PI
+#define M_PI 3.1415926f
+#endif /*M_PI*/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+NVGcontext* nvgCreateAGG(int32_t w, int32_t h, enum NVGtexture format, uint8_t* data);
+void nvgReinitAgge(NVGcontext* ctx, int32_t w, int32_t h, enum NVGtexture, uint8_t* data);
+void nvgDeleteAGG(NVGcontext* ctx);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NANOVG_AGG_H */

3rd/nanovg/agg/nanovg_vertex.h

@@ -0,0 +1,52 @@
+#pragma once
+
+#include "nanovg.h"
+#include "agg_basics.h"
+
+namespace agg {
+class nanovg_vertex {
+ public:
+  class iterator;
+
+ public:
+  nanovg_vertex(NVGvertex* vertex, int n) {
+    _n = n;
+    _index = 0;
+    _vertex = vertex;
+  }
+
+  void rewind(unsigned) {
+    _index = 0;
+  }
+
+  unsigned vertex(double* x, double* y) {
+    int index = _index++;
+    NVGvertex* p = _vertex + index;
+
+    if (index < _n) {
+      *x = p->x;
+      *y = p->y;
+
+      if (index == 0) {
+        return path_cmd_move_to;
+      } else if (index == (_n - 1)) {
+        if (p->x == _vertex[0].x && p->y == _vertex[0].y) {
+          return (path_cmd_end_poly | path_flags_close);
+        } else {
+          return path_cmd_line_to;
+        }
+      } else {
+        return path_cmd_line_to;
+      }
+    } else {
+      return path_cmd_stop;
+    }
+  }
+
+ private:
+  int _n;
+  int _index;
+  NVGvertex* _vertex;
+};
+
+}  // namespace agg

3rd/nanovg/agge/nanovg_agge.cpp

@@ -70,7 +70,7 @@ struct AGGENVGcontext {
   int32_t w;
   int32_t h;
   uint8_t* data;
-  agge_bitmap_format_t format;
+  enum NVGtexture format;
 
   /*agge related*/
   agge::renderer ren;
@@ -331,38 +331,38 @@ static void aggenvg__renderDelete(void* uptr) {
 }
 
 static void nvgInitAGGE(AGGENVGcontext* agge, NVGparams* params, int32_t w, int32_t h,
-                        agge_bitmap_format_t format, uint8_t* data) {
+                        enum NVGtexture format, uint8_t* data) {
   agge->w = w;
   agge->h = h;
   agge->data = data;
   agge->format = format;
 
   switch (agge->format) {
-    case AGGE_RGBA8888: {
+    case NVG_TEXTURE_RGBA: {
       params->renderTriangles = renderTriangles<agge::pixel32_rgba>;
       params->renderStroke = renderStroke<agge::pixel32_rgba>;
       params->renderFill = renderFill<agge::pixel32_rgba>;
       break;
     }
-    case AGGE_BGRA8888: {
+    case NVG_TEXTURE_BGRA: {
       params->renderTriangles = renderTriangles<agge::pixel32_bgra>;
       params->renderStroke = renderStroke<agge::pixel32_bgra>;
       params->renderFill = renderFill<agge::pixel32_bgra>;
       break;
     }
-    case AGGE_RGB888: {
+    case NVG_TEXTURE_RGB: {
       params->renderTriangles = renderTriangles<agge::pixel24_rgb>;
       params->renderStroke = renderStroke<agge::pixel24_rgb>;
       params->renderFill = renderFill<agge::pixel24_rgb>;
       break;
     }
-    case AGGE_BGR888: {
+    case NVG_TEXTURE_BGR: {
       params->renderTriangles = renderTriangles<agge::pixel24_bgr>;
       params->renderStroke = renderStroke<agge::pixel24_bgr>;
       params->renderFill = renderFill<agge::pixel24_bgr>;
       break;
     }
-    case AGGE_BGR565: {
+    case NVG_TEXTURE_BGR565: {
       params->renderTriangles = renderTriangles<agge::pixel16_bgr565>;
       params->renderStroke = renderStroke<agge::pixel16_bgr565>;
       params->renderFill = renderFill<agge::pixel16_bgr565>;
@@ -375,7 +375,7 @@ static void nvgInitAGGE(AGGENVGcontext* agge, NVGparams* params, int32_t w, int3
   }
 }
 
-void nvgReinitAgge(NVGcontext* ctx, int32_t w, int32_t h, agge_bitmap_format_t format,
+void nvgReinitAgge(NVGcontext* ctx, int32_t w, int32_t h, enum NVGtexture format,
                    uint8_t* data) {
   NVGparams* params = nvgGetParams(ctx);
   AGGENVGcontext* agge = (AGGENVGcontext*)(params->userPtr);
@@ -383,7 +383,7 @@ void nvgReinitAgge(NVGcontext* ctx, int32_t w, int32_t h, agge_bitmap_format_t f
   nvgInitAGGE(agge, params, w, h, format, data);
 }
 
-NVGcontext* nvgCreateAGGE(int32_t w, int32_t h, agge_bitmap_format_t format, uint8_t* data) {
+NVGcontext* nvgCreateAGGE(int32_t w, int32_t h, enum NVGtexture format, uint8_t* data) {
   NVGparams params;
   NVGcontext* ctx = NULL;
   AGGENVGcontext* agge = new AGGENVGcontext();

3rd/nanovg/agge/nanovg_agge.h

@@ -15,17 +15,8 @@
 extern "C" {
 #endif
 
-typedef enum _agge_bitmap_format_t {
-  AGGE_RGBA8888 = 0,
-  AGGE_BGRA8888,
-  AGGE_RGB888,
-  AGGE_BGR888,
-  AGGE_RGB565,
-  AGGE_BGR565
-} agge_bitmap_format_t;
-
-NVGcontext* nvgCreateAGGE(int32_t w, int32_t h, agge_bitmap_format_t format, uint8_t* data);
-void nvgReinitAgge(NVGcontext* ctx, int32_t w, int32_t h, agge_bitmap_format_t format,
+NVGcontext* nvgCreateAGGE(int32_t w, int32_t h, enum NVGtexture format, uint8_t* data);
+void nvgReinitAgge(NVGcontext* ctx, int32_t w, int32_t h, enum NVGtexture format,
                    uint8_t* data);
 void nvgDeleteAGGE(NVGcontext* ctx);
 

3rd/nanovg/base/nanovg.h

@@ -621,7 +621,8 @@ enum NVGtexture {
 	NVG_TEXTURE_BGRA = 0x04,
 	NVG_TEXTURE_RGB  = 0x08,
 	NVG_TEXTURE_BGR  = 0x16,
-	NVG_TEXTURE_BGR565 = 0x32
+	NVG_TEXTURE_RGB565 = 0x32,
+	NVG_TEXTURE_BGR565 = 0x64
 };
 
 struct NVGscissor {

3rd/nanovg/bgfx/TODO

@@ -0,0 +1 @@
+todo

3rd/nanovg/demos/agg_draw_image.c

@@ -1,6 +1,6 @@
 #include <string.h>
 #include <stdlib.h>
-#include "nanovg_agg.h"
+#include "agg/nanovg_agg.h"
 
 #define STB_IMAGE_WRITE_IMPLEMENTATION
 #include "../stb/stb_image_write.h"
@@ -10,18 +10,10 @@
 
 #include "draw_image.inc"
 
-static int load_image(NVGcontext* vg, const char* filename, int32_t* comp, int32_t* iw, int32_t* ih) {
-
-  uint8_t* data = stbi_load(filename, iw, ih, comp, 4);
-
-  return nvgCreateImageRaw(vg, *iw, *ih, NVG_TEXTURE_RGBA, 0, data);
-}
-
-
 static void run_test(int32_t w, int32_t h, int32_t BPP, const char* filename) {
   int32_t size = w * h * BPP;
   uint8_t* data = (uint8_t*)malloc(size);
-  NVGcontext* vg = nvgCreateAGG(w, h, BPP == 2 ? AGG_RGB565 : AGG_RGBA8888, data);
+  NVGcontext* vg = nvgCreateAGG(w, h, BPP == 2 ? NVG_TEXTURE_BGR565 : NVG_TEXTURE_RGBA, data);
 
   memset(data, 0xff, size);
   do_draw(vg, w, h);

3rd/nanovg/demos/agg_fill.c

@@ -1,6 +1,6 @@
 #include <string.h>
 #include <stdlib.h>
-#include "nanovg-agg/nanovg_agg.h"
+#include "agg/nanovg_agg.h"
 
 #define STB_IMAGE_WRITE_IMPLEMENTATION
 #include "../stb/stb_image_write.h"
@@ -13,7 +13,7 @@
 static void run_test(int32_t w, int32_t h, int32_t BPP, const char* filename) {
   int32_t size = w * h * BPP;
   uint8_t* data = (uint8_t*)malloc(size);
-  NVGcontext* vg = nvgCreateAGG(w, h, BPP == 2 ? AGGE_RGB565 : AGGE_RGBA8888, data);
+  NVGcontext* vg = nvgCreateAGG(w, h, BPP == 2 ? NVG_TEXTURE_BGR565 : NVG_TEXTURE_RGBA, data);
 
   memset(data, 0xff, size);
 

3rd/nanovg/demos/agg_stroke.c

@@ -1,7 +1,7 @@
 #include <math.h>
 #include <stdlib.h>
 #include <string.h>
-#include "agge/nanovg_agg.h"
+#include "agg/nanovg_agg.h"
 
 #define STB_IMAGE_WRITE_IMPLEMENTATION
 #include "../stb/stb_image_write.h"
@@ -14,7 +14,7 @@
 static void run_test(int32_t w, int32_t h, int32_t BPP, const char* filename) {
   int32_t size = w * h * BPP;
   uint8_t* data = (uint8_t*)malloc(size);
-  NVGcontext* vg = nvgCreateAGG(w, h, BPP == 2 ? AGG_RGB565 : AGG_RGBA8888, data);
+  NVGcontext* vg = nvgCreateAGG(w, h, BPP == 2 ? NVG_TEXTURE_BGR565 : NVG_TEXTURE_RGBA, data);
 
   memset(data, 0xff, size);
   do_stroke(vg, w, h);

3rd/nanovg/demos/agge_draw_image.c

@@ -13,7 +13,7 @@
 static void run_test(int32_t w, int32_t h, int32_t BPP, const char* filename) {
   int32_t size = w * h * BPP;
   uint8_t* data = (uint8_t*)malloc(size);
-  NVGcontext* vg = nvgCreateAGGE(w, h, BPP == 2 ? AGGE_BGR565 : AGGE_RGBA8888, data);
+  NVGcontext* vg = nvgCreateAGGE(w, h, BPP == 2 ? NVG_TEXTURE_BGR565 : NVG_TEXTURE_BGRA, data);
 
   memset(data, 0xff, size);
   do_draw(vg, w, h);

3rd/nanovg/demos/agge_fill.c

@@ -13,7 +13,7 @@
 static void run_test(int32_t w, int32_t h, int32_t BPP, const char* filename) {
   int32_t size = w * h * BPP;
   uint8_t* data = (uint8_t*)malloc(size);
-  NVGcontext* vg = nvgCreateAGGE(w, h, BPP == 2 ? AGGE_BGR565 : AGGE_RGBA8888, data);
+  NVGcontext* vg = nvgCreateAGGE(w, h, BPP == 2 ? NVG_TEXTURE_BGR565 : NVG_TEXTURE_BGRA, data);
 
   memset(data, 0xff, size);
 

3rd/nanovg/demos/agge_stroke.c

@@ -14,7 +14,7 @@
 static void run_test(int32_t w, int32_t h, int32_t BPP, const char* filename) {
   int32_t size = w * h * BPP;
   uint8_t* data = (uint8_t*)malloc(size);
-  NVGcontext* vg = nvgCreateAGGE(w, h, BPP == 2 ? AGGE_BGR565 : AGGE_RGBA8888, data);
+  NVGcontext* vg = nvgCreateAGGE(w, h, BPP == 2 ? NVG_TEXTURE_BGR565 : NVG_TEXTURE_BGRA, data);
 
   memset(data, 0xff, size);
   do_stroke(vg, w, h);

3rd/nanovg/demos/draw_image.inc

@@ -27,7 +27,7 @@ static void do_draw(NVGcontext* vg, int32_t w, int32_t h) {
   int32_t iw = 0;
   int32_t ih = 0;
   int32_t comp = 4;
-  int img = load_image(vg, "demos/rgb.png", &comp, &iw, &ih);
+  int img = load_image(vg, "demos/assets/raw/images/x2/rgb.png", &comp, &iw, &ih);
 
   nvgBeginFrame(vg, w, h, 1);
 
@@ -37,7 +37,7 @@ static void do_draw(NVGcontext* vg, int32_t w, int32_t h) {
   draw_image(vg, imgPaint, 0, 0, iw, ih, 10, 100, iw*2, ih*2);
  
 
-  int img2 = load_image(vg, "demos/rgba.png", &comp, &iw, &ih);
+  int img2 = load_image(vg, "demos/assets/raw/images/x2/rgba.png", &comp, &iw, &ih);
   NVGpaint imgPaint2 = nvgImagePattern(vg, 0, 0, iw, ih, 0, img2, 1);
 
   nvgTranslate(vg, 100, 100);

README.md

@@ -171,6 +171,17 @@ bin\demoui
 
 ## 最新动态
 
+* 2018/10/15
+  * 用agg实现nanovg的渲染后端。
+  * 更新文档、编译脚本并测试。
+
+* 2018/10/14
+  * 用agg实现nanovg的渲染后端。
+
+* 2018/10/13
+  * 重新整理第三方库。
+  * 集成修改过的SDL(Linux/Winodws支持高清屏)。
+
 * 2018/10/12
   * 增加大字体demo。
   * 修改文本垂直居中的问题。

SConstruct

@@ -16,31 +16,54 @@ LIB_DIR=joinPath(TK_ROOT, 'lib')
 if OS_NAME == 'Windows':
   TK_ROOT=TK_ROOT.replace('\\', '\\\\');
 
-INPUT_ENGINE='null'
+#INPUT_ENGINE='null'
 INPUT_ENGINE='pinyin'
 
-LCD='SDL'
+#LCD='SDL'
 LCD='GL'
 
 VGCANVAS='NANOVG'
+#NANOVG_BACKEND='AGGE'
+#NANOVG_BACKEND='BGFX'
+#NANOVG_BACKEND='GL3'
+#NANOVG_BACKEND='GLES'
+#NANOVG_BACKEND='AGG'
+NANOVG_BACKEND='AGGE'
 
-FRAME_BUFFER_FORMAT='bgr888'
-FRAME_BUFFER_FORMAT='bgra8888'
+#FRAME_BUFFER_FORMAT='bgr888'
+#FRAME_BUFFER_FORMAT='bgra8888'
 FRAME_BUFFER_FORMAT='bgr565'
 
 COMMON_CCFLAGS=' -DTK_ROOT=\\\"'+TK_ROOT+'\\\" -DHAS_STD_MALLOC -DWITH_SDL -DWITH_FS_RES -DHAS_STDIO -DWITH_DESKTOP_STYLE '
 COMMON_CCFLAGS=COMMON_CCFLAGS+' -DSTBTT_STATIC -DSTB_IMAGE_STATIC -DWITH_STB_IMAGE -DWITH_STB_FONT -DWITH_VGCANVAS -DWITH_UNICODE_BREAK '
 
+NANOVG_BACKEND_LIBS=[];
+NANOVG_BACKEND_PROJS=[];
+
 if LCD == 'GL':
-  COMMON_CCFLAGS = COMMON_CCFLAGS + ' -DWITH_NANOVG -DWITH_NANOVG_GL3 -DWITH_NANOVG_GL -DWITH_VGCANVAS_LCD'
+  NANOVG_BACKEND='GL'
+  COMMON_CCFLAGS = COMMON_CCFLAGS + ' -DWITH_NANOVG_GL -DWITH_VGCANVAS_LCD'
 else:
-  COMMON_CCFLAGS = COMMON_CCFLAGS + ' -DWITH_BITMAP_BGRA1 -DWITH_NANOVG_AGGE -DWITH_NANOVG_SOFT'
+  COMMON_CCFLAGS = COMMON_CCFLAGS + ' -DWITH_BITMAP_BGRA -DWITH_NANOVG_SOFT '
   if FRAME_BUFFER_FORMAT=='bgra8888':
-    COMMON_CCFLAGS=COMMON_CCFLAGS+' -DWITH_FB_BGRA8888=1';
-  elif FRAME_BUFFER_FORMAT=='bgr888':
-    COMMON_CCFLAGS=COMMON_CCFLAGS+' -DWITH_FB_BGR888=1';
+    COMMON_CCFLAGS=COMMON_CCFLAGS+' -DWITH_FB_BGRA8888=1 ';
   else:
-    COMMON_CCFLAGS=COMMON_CCFLAGS+' -DWITH_FB_BGR565=1 -DWITH_BITMAP_BGR565';
+    COMMON_CCFLAGS=COMMON_CCFLAGS+' -DWITH_FB_BGR565=1 ';
+
+if NANOVG_BACKEND == 'AGG':
+  NANOVG_BACKEND_LIBS=['nanovg-agg', 'agg'];
+  NANOVG_BACKEND_PROJS=['3rd/agg/SConscript'];
+  COMMON_CCFLAGS = COMMON_CCFLAGS + ' -DWITH_NANOVG_AGG '
+elif NANOVG_BACKEND == 'AGGE':
+  NANOVG_BACKEND_LIBS=['nanovg-agge', 'agge'];
+  NANOVG_BACKEND_PROJS=['3rd/agge/SConscript'];
+  COMMON_CCFLAGS = COMMON_CCFLAGS + ' -DWITH_NANOVG_AGGE -DWITH_BITMAP_BGR565 '
+elif NANOVG_BACKEND == 'BGFX':
+  COMMON_CCFLAGS = COMMON_CCFLAGS + ' -DWITH_NANOVG_BGFX '
+elif NANOVG_BACKEND == 'GLES':
+  COMMON_CCFLAGS = COMMON_CCFLAGS + ' -DWITH_NANOVG_GLES '
+else:
+  COMMON_CCFLAGS = COMMON_CCFLAGS + ' -DWITH_NANOVG_GL3 '
 
 os.environ['LCD'] = LCD
 os.environ['VGCANVAS'] = VGCANVAS 
@@ -49,6 +72,7 @@ os.environ['LIB_DIR'] = LIB_DIR;
 os.environ['TK_ROOT'] = TK_ROOT;
 os.environ['GTEST_ROOT'] = GTEST_ROOT;
 os.environ['INPUT_ENGINE'] = INPUT_ENGINE;
+os.environ['NANOVG_BACKEND'] = NANOVG_BACKEND;
 os.environ['FRAME_BUFFER_FORMAT'] = FRAME_BUFFER_FORMAT;
 
 OS_LIBS=[]
@@ -69,7 +93,7 @@ elif OS_NAME == 'Linux':
   OS_LIBS = ['GL'] + OS_LIBS + ['gtk-3','gdk-3','Xext', 'X11', 'sndio','stdc++', 'pthread', 'm', 'dl']
   COMMON_CCFLAGS = COMMON_CCFLAGS + ' -DLINUX -DHAS_PTHREAD'
   COMMON_CCFLAGS = COMMON_CCFLAGS + ' -DSDL_REAL_API -DSDL_TIMER_UNIX -DSDL_VIDEO_DRIVER_X11 -DSDL_VIDEO_DRIVER_X11_SUPPORTS_GENERIC_EVENTS '
-  COMMON_CCFLAGS = COMMON_CCFLAGS + ' -DSDL_AUDIO_DRIVER_SNDIO -DSDL_VIDEO_OPENGL_GLX '
+  COMMON_CCFLAGS = COMMON_CCFLAGS + ' -DSDL_AUDIO_DRIVER_SNDIO -DSDL_VIDEO_OPENGL_GLX -DSDL_VIDEO_RENDER_OGL '
   COMMON_CCFLAGS = COMMON_CCFLAGS + ' -DSDL_LOADSO_DLOPEN -DSDL_VIDEO_OPENGL_EGL -DSDL_VIDEO_OPENGL_ES2 '
   COMMON_CCFLAGS = COMMON_CCFLAGS + ' -DSDL_REAL_API -DSDL_HAPTIC_DISABLED -DSDL_SENSOR_DISABLED -DSDL_JOYSTICK_DISABLED '
   OS_PROJECTS=['3rd/SDL/SConscript']
@@ -86,13 +110,14 @@ elif OS_NAME == 'Windows':
 LINKFLAGS=OS_LINKFLAGS;
 LIBPATH=[LIB_DIR] + OS_LIBPATH
 CCFLAGS=OS_FLAGS + COMMON_CCFLAGS 
-LIBS=['awtk', 'gpinyin', 'awtk', 'agge', 'linebreak', 'nanovg-agge', 'nanovg', 'SDL2', 'glad'] + OS_LIBS
+LIBS=['awtk', 'gpinyin', 'awtk', 'linebreak'] + NANOVG_BACKEND_LIBS + ['nanovg', 'SDL2', 'glad'] + OS_LIBS
 
 CPPPATH=[TK_ROOT, 
   TK_SRC, 
   TK_3RD_ROOT, 
   joinPath(TK_SRC, 'ext_widgets'), 
   joinPath(TK_3RD_ROOT, 'agge'), 
+  joinPath(TK_3RD_ROOT, 'agg/include'), 
   joinPath(TK_3RD_ROOT, 'nanovg'), 
   joinPath(TK_3RD_ROOT, 'nanovg/base'), 
   joinPath(TK_3RD_ROOT, 'nanovg/gl'), 
@@ -114,8 +139,7 @@ DefaultEnvironment(CCFLAGS = CCFLAGS,
   OS_SUBSYSTEM_WINDOWS=OS_SUBSYSTEM_WINDOWS
 )
 
-SConscriptFiles=[
-  '3rd/agge/SConscript',
+SConscriptFiles=NANOVG_BACKEND_PROJS + [
   '3rd/nanovg/SConscript',
   '3rd/glad/SConscript',
   '3rd/gpinyin/SConscript', 

demos/demo_vg_app.c

@@ -527,7 +527,7 @@ ret_t application_init() {
   widget_t* win = window_create(NULL, 0, 0, 0, 0);
   widget_t* canvas = view_create(win, 0, 0, win->w, win->h);
 
- // widget_on(canvas, EVT_PAINT, on_paint_vg_simple, NULL);
+  //widget_on(canvas, EVT_PAINT, on_paint_vg_simple, NULL);
   widget_on(canvas, EVT_PAINT, on_paint_vg, NULL);
 
   timer_add(on_timer, win, 500);

src/base/canvas.c

@@ -233,15 +233,11 @@ ret_t canvas_begin_frame(canvas_t* c, rect_t* dirty_rect, lcd_draw_mode_t draw_m
   c->ox = 0;
   c->oy = 0;
 
-#ifdef WITH_NANOVG_SOFT
   if (lcd_is_swappable(c->lcd)) {
     canvas_set_clip_rect(c, NULL);
   } else {
     canvas_set_clip_rect(c, dirty_rect);
   }
-#else  
-  canvas_set_clip_rect(c, NULL);
-#endif/*WITH_NANOVG_SOFT*/
 
   return lcd_begin_frame(c->lcd, dirty_rect, draw_mode);
 }

src/main_loop/sdl2_common.inc

@@ -159,6 +159,9 @@ static ret_t main_loop_sdl2_dispatch_window_event(main_loop_simple_t* loop, SDL_
       break;
     case SDL_WINDOWEVENT_CLOSE:
       log_debug("Window %d closed\n", event->window.windowID);
+      loop->user1 = NULL;
+      loop->user2 = NULL;
+      main_loop_quit(&(loop->base));
       break;
 #if SDL_VERSION_ATLEAST(2, 0, 5)
     case SDL_WINDOWEVENT_TAKE_FOCUS:
@@ -180,7 +183,7 @@ static ret_t main_loop_sdl2_dispatch(main_loop_simple_t* loop) {
   SDL_Event event;
   ret_t ret = RET_OK;
 
-  while (SDL_PollEvent(&event)) {
+  while (SDL_PollEvent(&event) && loop->base.running) {
     switch (event.type) {
       case SDL_KEYDOWN:
       case SDL_KEYUP: {

src/vgcanvas/vgcanvas_nanovg.c

@@ -41,6 +41,8 @@
 
 #ifdef WITH_NANOVG_AGGE
 #include "agge/nanovg_agge.h"
+#elif defined(WITH_NANOVG_AGG)
+#include "agg/nanovg_agg.h"
 #else /*OpenGL*/
 #include "glad/glad.h"
 #include "nanovg_gl.h"
@@ -58,10 +60,9 @@ typedef struct _vgcanvas_nanovg_t {
   NVGcontext* vg;
   uint32_t text_align_v;
   uint32_t text_align_h;
-#ifdef WITH_NANOVG_AGGE
-#else
+#if defined(WITH_NANOVG_GL)
   SDL_Window* sdl_window;
-#endif /*WITH_NANOVG_AGGE*/
+#endif /*WITH_NANOVG_GL*/
 } vgcanvas_nanovg_t;
 
 static int vgcanvas_nanovg_ensure_image(vgcanvas_nanovg_t* canvas, bitmap_t* img);
@@ -373,7 +374,7 @@ static float_t vgcanvas_nanovg_measure_text(vgcanvas_t* vgcanvas, const char* te
   return nvgTextBounds(vg, 0, 0, text, text + strlen(text), bounds);
 }
 
-#ifndef WITH_NANOVG_AGGE
+#if defined(WITH_NANOVG_GL)
 static ret_t nanovg_on_bitmap_destroy(bitmap_t* img) {
   int32_t id = (char*)(img->specific) - (char*)NULL;
   NVGcontext* vg = (NVGcontext*)(img->specific_ctx);
@@ -387,7 +388,7 @@ static ret_t nanovg_on_bitmap_destroy(bitmap_t* img) {
 
   return RET_OK;
 }
-#endif /*WITH_NANOVG_AGGE*/
+#endif /*WITH_NANOVG_GL*/
 
 static ret_t vgcanvas_nanovg_draw_image(vgcanvas_t* vgcanvas, bitmap_t* img, float_t sx, float_t sy,
                                         float_t sw, float_t sh, float_t dx, float_t dy, float_t dw,
@@ -513,33 +514,33 @@ static ret_t vgcanvas_nanovg_restore(vgcanvas_t* vgcanvas) {
   return RET_OK;
 }
 
-#if defined(WITH_NANOVG_AGGE)
-static agge_bitmap_format_t bitmap_format_to_agge(bitmap_format_t format) {
-  agge_bitmap_format_t f = AGGE_RGBA8888;
+#if defined(WITH_NANOVG_SOFT)
+static enum NVGtexture bitmap_format_to_nanovg(bitmap_format_t format) {
+  enum NVGtexture f = NVG_TEXTURE_BGRA;
 
   switch (format) {
     case BITMAP_FMT_RGBA8888: {
-      f = AGGE_RGBA8888;
+      f = NVG_TEXTURE_RGBA;
       break;
     }
     case BITMAP_FMT_BGRA8888: {
-      f = AGGE_BGRA8888;
+      f = NVG_TEXTURE_BGRA;
       break;
     }
     case BITMAP_FMT_BGR888: {
-      f = AGGE_BGR888;
+      f = NVG_TEXTURE_BGR;
       break;
     }
     case BITMAP_FMT_RGB888: {
-      f = AGGE_RGB888;
+      f = NVG_TEXTURE_RGB;
       break;
     }
     case BITMAP_FMT_BGR565: {
-      f = AGGE_BGR565;
+      f = NVG_TEXTURE_BGR565;
       break;
     }
     case BITMAP_FMT_RGB565: {
-      f = AGGE_RGB565;
+      f = NVG_TEXTURE_RGB565;
       break;
     }
     default: {
@@ -575,7 +576,7 @@ static ret_t vgcanvas_nanovg_reinit(vgcanvas_t* vgcanvas, uint32_t w, uint32_t h
   vgcanvas->w = w;
   vgcanvas->h = h;
   vgcanvas->buff = (uint32_t*)data;
-  nvgReinitAgge(vg, w, h, bitmap_format_to_agge(format), data);
+  nvgReinitAgge(vg, w, h, bitmap_format_to_nanovg(format), data);
 
   return RET_OK;
 }
@@ -767,6 +768,8 @@ static ret_t vgcanvas_nanovg_destroy(vgcanvas_t* vgcanvas) {
   nvgDeleteGLES3(vg);
 #elif defined(WITH_NANOVG_AGGE)
   nvgDeleteAGGE(vg);
+#elif defined(WITH_NANOVG_AGG)
+  nvgDeleteAGG(vg);
 #endif
 
   return RET_OK;
@@ -821,9 +824,9 @@ static const vgcanvas_vtable_t vt = {vgcanvas_nanovg_reinit,
                                      vgcanvas_nanovg_unbind_fbo,
                                      vgcanvas_nanovg_destroy};
 
-#if defined(WITH_NANOVG_AGGE)
+#if defined(WITH_NANOVG_SOFT)
 vgcanvas_t* vgcanvas_create(uint32_t w, uint32_t h, bitmap_format_t format, void* data) {
-  agge_bitmap_format_t f = bitmap_format_to_agge(format);
+  enum NVGtexture f = bitmap_format_to_nanovg(format);
   vgcanvas_nanovg_t* nanovg = (vgcanvas_nanovg_t*)TKMEM_ZALLOC(vgcanvas_nanovg_t);
   return_value_if_fail(nanovg != NULL, NULL);
 
@@ -832,8 +835,13 @@ vgcanvas_t* vgcanvas_create(uint32_t w, uint32_t h, bitmap_format_t format, void
   nanovg->base.vt = &vt;
   nanovg->base.ratio = 1;
   nanovg->base.buff = (uint32_t*)data;
-
+#if defined(WITH_NANOVG_AGG)
+  nanovg->vg = nvgCreateAGG(w, h, f, (uint8_t*)data);
+#elif defined(WITH_NANOVG_AGGE)
   nanovg->vg = nvgCreateAGGE(w, h, f, (uint8_t*)data);
+#else
+#error "not supported"
+#endif
 
   return &(nanovg->base);
 }

tests/canvas_test.cc

@@ -17,22 +17,6 @@ TEST(Canvas, draw_hline) {
   r = rect_init(100, 100, 200, 200);
   canvas_begin_frame(&c, &r, LCD_DRAW_NORMAL);
 
-  lcd_log_reset(lcd);
-  canvas_draw_hline(&c, 10, 20, 100);
-  ASSERT_EQ(lcd_log_get_commands(lcd), "");
-
-  lcd_log_reset(lcd);
-  canvas_draw_hline(&c, 10, 310, 100);
-  ASSERT_EQ(lcd_log_get_commands(lcd), "");
-
-  lcd_log_reset(lcd);
-  canvas_draw_hline(&c, 10, 110, 10);
-  ASSERT_EQ(lcd_log_get_commands(lcd), "");
-
-  lcd_log_reset(lcd);
-  canvas_draw_hline(&c, 320, 110, 10);
-  ASSERT_EQ(lcd_log_get_commands(lcd), "");
-
   lcd_log_reset(lcd);
   canvas_draw_hline(&c, 90, 110, 40);
   ASSERT_EQ(lcd_log_get_commands(lcd), "dhl(100,110,30);");
@@ -61,22 +45,6 @@ TEST(Canvas, draw_vline) {
   r = rect_init(100, 100, 200, 200);
   canvas_begin_frame(&c, &r, LCD_DRAW_NORMAL);
 
-  lcd_log_reset(lcd);
-  canvas_draw_vline(&c, 10, 20, 100);
-  ASSERT_EQ(lcd_log_get_commands(lcd), "");
-
-  lcd_log_reset(lcd);
-  canvas_draw_vline(&c, 310, 20, 100);
-  ASSERT_EQ(lcd_log_get_commands(lcd), "");
-
-  lcd_log_reset(lcd);
-  canvas_draw_vline(&c, 110, 10, 10);
-  ASSERT_EQ(lcd_log_get_commands(lcd), "");
-
-  lcd_log_reset(lcd);
-  canvas_draw_vline(&c, 110, 320, 10);
-  ASSERT_EQ(lcd_log_get_commands(lcd), "");
-
   lcd_log_reset(lcd);
   canvas_draw_vline(&c, 110, 90, 40);
   ASSERT_EQ(lcd_log_get_commands(lcd), "dvl(110,100,30);");
@@ -105,34 +73,6 @@ TEST(Canvas, fill_rect) {
   r = rect_init(100, 100, 200, 200);
   canvas_begin_frame(&c, &r, LCD_DRAW_NORMAL);
 
-  lcd_log_reset(lcd);
-  canvas_fill_rect(&c, 10, 10, 10, 10);
-  ASSERT_EQ(lcd_log_get_commands(lcd), "");
-
-  lcd_log_reset(lcd);
-  canvas_fill_rect(&c, 10, 210, 10, 10);
-  ASSERT_EQ(lcd_log_get_commands(lcd), "");
-
-  lcd_log_reset(lcd);
-  canvas_fill_rect(&c, 10, 310, 10, 10);
-  ASSERT_EQ(lcd_log_get_commands(lcd), "");
-
-  lcd_log_reset(lcd);
-  canvas_fill_rect(&c, 310, 10, 10, 10);
-  ASSERT_EQ(lcd_log_get_commands(lcd), "");
-
-  lcd_log_reset(lcd);
-  canvas_fill_rect(&c, 310, 210, 10, 10);
-  ASSERT_EQ(lcd_log_get_commands(lcd), "");
-
-  lcd_log_reset(lcd);
-  canvas_fill_rect(&c, 310, 310, 10, 10);
-  ASSERT_EQ(lcd_log_get_commands(lcd), "");
-
-  lcd_log_reset(lcd);
-  canvas_fill_rect(&c, 120, 10, 10, 10);
-  ASSERT_EQ(lcd_log_get_commands(lcd), "");
-
   lcd_log_reset(lcd);
   canvas_fill_rect(&c, 120, 310, 10, 10);
   ASSERT_EQ(lcd_log_get_commands(lcd), "");
@@ -229,22 +169,6 @@ TEST(Canvas, draw_glyph) {
   canvas_begin_frame(&c, &r, LCD_DRAW_NORMAL);
   canvas_set_font(&c, "demo0", font_size);
 
-  lcd_log_reset(lcd);
-  canvas_draw_char(&c, 0, 0, 0);
-  ASSERT_EQ(lcd_log_get_commands(lcd), "");
-
-  lcd_log_reset(lcd);
-  canvas_draw_char(&c, 0, 0, 120);
-  ASSERT_EQ(lcd_log_get_commands(lcd), "");
-
-  lcd_log_reset(lcd);
-  canvas_draw_char(&c, 0, 120, 320);
-  ASSERT_EQ(lcd_log_get_commands(lcd), "");
-
-  lcd_log_reset(lcd);
-  canvas_draw_char(&c, 0, 330, 320);
-  ASSERT_EQ(lcd_log_get_commands(lcd), "");
-
   lcd_log_reset(lcd);
   canvas_draw_char(&c, 0, 95, 95);
   ASSERT_EQ(lcd_log_get_commands(lcd), "dg(5,5,5,5,100,100);");

tools/image_gen/image_gen.c

@@ -66,8 +66,9 @@ uint32_t image_gen_buff(bitmap_t* image, uint8_t* output_buff, uint32_t buff_siz
     } else if (image->format == BITMAP_FMT_BGR565) {
       size = sizeof(uint16_t) * image->w * image->h;
       memcpy(header->data, image->data, size);
-    } else {
-      assert(!"not supported");
+    } else if(image->format == BITMAP_FMT_BGRA8888) {
+      size = sizeof(uint32_t) * image->w * image->h;
+      memcpy(header->data, image->data, size);
     }
   } else {
     size = sizeof(uint32_t) * image->w * image->h;