diff --git a/3rd/agge/agge/pixel.h b/3rd/agge/agge/pixel.h
index 034828ca4..8ef4a91fc 100644
--- a/3rd/agge/agge/pixel.h
+++ b/3rd/agge/agge/pixel.h
@@ -205,17 +205,38 @@ inline void pixel_blend(pixel24_rgb& t, const pixel32_rgba& s, uint8_t a) {
   }
 }
 
+static inline uint8_t pixel_limit_uint8(int tmp) {
+  if(tmp > 0xff) {
+    tmp = 0xff;
+  } else if(tmp < 0) {
+    tmp = 0;
+  }
+  return (uint8_t)tmp;
+}
+
 template <>
 inline void pixel_blend(pixel32_rgba& t, const pixel32_rgba& s, uint8_t a) {
   if (a > 0xf4) {
     t.r = s.r;
     t.g = s.g;
-    t.b = s.b;
+    t.b = s.b; 
+    t.a = a;
   } else if (a > 0x01) {
     uint8_t m_a = 0xff - a;
-    t.r = (s.r * a + t.r * m_a) >> 8;
-    t.g = (s.g * a + t.g * m_a) >> 8;
-    t.b = (s.b * a + t.b * m_a) >> 8;
+    if(t.a > 0xf4) {
+      t.r = (s.r * a + t.r * m_a) >> 8;
+      t.g = (s.g * a + t.g * m_a) >> 8;
+      t.b = (s.b * a + t.b * m_a) >> 8;
+    } else {
+      uint8_t out_a = pixel_limit_uint8(a + t.a - ((a * t.a) >> 8));
+      if(out_a > 0) {
+        uint8_t d_a = (t.a * (0xff - a)) >> 8;
+        t.r = (s.r * a + t.r * d_a) / out_a;
+        t.g = (s.g * a + t.g * d_a) / out_a;
+        t.b = (s.b * a + t.b * d_a) / out_a;
+      }
+      t.a = out_a;
+    }
   }
 }
 
@@ -225,11 +246,23 @@ inline void pixel_blend(pixel32_bgra& t, const pixel32_rgba& s, uint8_t a) {
     t.r = s.r;
     t.g = s.g;
     t.b = s.b;
+    t.a = a;
   } else if (a > 0x01) {
-    uint8_t m_a = 0xff - a;
-    t.r = (s.r * a + t.r * m_a) >> 8;
-    t.g = (s.g * a + t.g * m_a) >> 8;
-    t.b = (s.b * a + t.b * m_a) >> 8;
+    if(t.a > 0xf4) {
+      uint8_t m_a = 0xff - a;
+      t.r = (s.r * a + t.r * m_a) >> 8;
+      t.g = (s.g * a + t.g * m_a) >> 8;
+      t.b = (s.b * a + t.b * m_a) >> 8;
+    } else {
+      uint8_t out_a = pixel_limit_uint8(a + t.a - ((a * t.a) >> 8));
+      if(out_a > 0) {
+        uint8_t d_a = (t.a * (0xff - a)) >> 8;
+        t.r = (s.r * a + t.r * d_a) / out_a;
+        t.g = (s.g * a + t.g * d_a) / out_a;
+        t.b = (s.b * a + t.b * d_a) / out_a;
+      }
+      t.a = out_a;
+    }
   }
 }
 
diff --git a/docs/changes.md b/docs/changes.md
index b0e9fe44c..a06022c38 100644
--- a/docs/changes.md
+++ b/docs/changes.md
@@ -3,7 +3,8 @@
   * 增加事件录制与重放功能，辅助手动测试和压力测试。
   * 完善 text edit（感谢大恒提供补丁）。
   * 完善 system settings 和 release 脚本（感谢俊杰提供补丁）。
-  
+  * 支持硬件多层合并(GUI + Camera)（感谢尧燊提供补丁）。
+
 * 2020/05/14
   * 修复 clip view 中 type 的问题（感谢尧燊提供补丁）。
   * 修复 file browser up 中的问题（感谢瑞安提供补丁）。
diff --git a/src/base/dialog_highlighter.c b/src/base/dialog_highlighter.c
index d4021f19a..08e13c274 100644
--- a/src/base/dialog_highlighter.c
+++ b/src/base/dialog_highlighter.c
@@ -76,6 +76,14 @@ ret_t dialog_highlighter_set_bg(dialog_highlighter_t* h, bitmap_t* img, framebuf
   return RET_OK;
 }
 
+ret_t dialog_highlighter_set_bg_clip_rect(dialog_highlighter_t* h, rect_t* clip_rect) {
+  return_value_if_fail(h != NULL && h->vt != NULL, RET_BAD_PARAMS);
+
+  h->clip_rect = rect_init(clip_rect->x, clip_rect->y, clip_rect->w, clip_rect->h);
+
+  return RET_OK;
+}
+
 ret_t dialog_highlighter_draw(dialog_highlighter_t* h, float_t percent) {
   return_value_if_fail(h != NULL && h->vt != NULL, RET_BAD_PARAMS);
 
diff --git a/src/base/dialog_highlighter.h b/src/base/dialog_highlighter.h
index 52ad1cd69..045b92418 100644
--- a/src/base/dialog_highlighter.h
+++ b/src/base/dialog_highlighter.h
@@ -86,6 +86,12 @@ struct _dialog_highlighter_t {
    */
   widget_t* dialog;
 
+  /**
+   * @property {rect_t*} clip_rect
+   * 截图的显示裁减区
+   */
+  rect_t clip_rect;
+
   /*private*/
   framebuffer_object_t fbo;
   const dialog_highlighter_vtable_t* vt;
@@ -113,6 +119,16 @@ dialog_highlighter_t* dialog_highlighter_create(const dialog_highlighter_vtable_
  */
 ret_t dialog_highlighter_set_bg(dialog_highlighter_t* h, bitmap_t* img, framebuffer_object_t* fbo);
 
+/**
+ * @method dialog_highlighter_set_bg_clip_rect
+ * 设置背景图片的显示裁减区。
+ * @param {dialog_highlighter_t*} h 对话框高亮策略对象。
+ * @param {rect_t*} clip_rect 背景显示裁减区。
+ *
+ * @return {ret_t} 返回RET_OK表示成功，否则表示失败。
+ */
+ret_t dialog_highlighter_set_bg_clip_rect(dialog_highlighter_t* h, rect_t* clip_rect);
+
 /**
  * @method dialog_highlighter_prepare
  * 初始化。在绘制完背景，在截图前调用。
diff --git a/src/base/pixel.h b/src/base/pixel.h
index 1ef97bd04..4c4ee3b84 100644
--- a/src/base/pixel.h
+++ b/src/base/pixel.h
@@ -24,6 +24,16 @@
 
 #include "tkc/color.h"
 
+static inline uint8_t tk_pixel_limit_uint8(int32_t tmp) {
+  if(tmp > 0xff) {
+    tmp = 0xff;
+  } else if(tmp < 0) {
+    tmp = 0;
+  }
+  return (uint8_t)tmp;
+}
+
+
 #pragma pack(push, 1)
 typedef struct _pixel_rgb565_t {
   uint16_t r : 5;
@@ -36,8 +46,18 @@ typedef struct _pixel_rgb565_t {
 #define pixel_rgb565_format BITMAP_FMT_RGB565
 #define pixel_rgb565_to_rgba(p) \
   { p.r << 3, p.g << 2, p.b << 3, 0xff }
+
 #define pixel_rgb565_from_rgb(r, g, b) \
   { r >> 3, g >> 2, b >> 3 }
+
+#if WITH_LCD_CLEAR_ALPHA
+#define pixel_rgb565_from_rgba(r, g, b, a) \
+  { (r * a) >> 11, (g * a) >> 10, (b * a) >> 11 }
+#else 
+#define pixel_rgb565_from_rgba(r, g, b, a) \
+  pixel_rgb565_from_rgb(r, g, b)
+#endif 
+
 static inline void pixel_rgb565_blend_rgba_dark(void* p, uint8_t a) {
   uint16_t v = *(uint16_t*)p;
 
@@ -65,9 +85,18 @@ typedef struct _pixel_bgr565_t {
 #define pixel_bgr565_format BITMAP_FMT_BGR565
 #define pixel_bgr565_to_rgba(p) \
   { p.r << 3, p.g << 2, p.b << 3, 0xff }
+
 #define pixel_bgr565_from_rgb(r, g, b) \
   { b >> 3, g >> 2, r >> 3 }
 
+#if WITH_LCD_CLEAR_ALPHA
+#define pixel_bgr565_from_rgba(r, g, b, a) \
+  { (b * a) >> 11, (g * a) >> 10, (r * a) >> 11 }
+#else 
+#define pixel_bgr565_from_rgba(r, g, b, a) \
+  pixel_bgr565_from_rgb(r, g, b)
+#endif 
+
 static inline void pixel_bgr565_blend_rgba_dark(void* p, uint8_t a) {
   uint16_t v = *(uint16_t*)p;
 
@@ -105,9 +134,18 @@ typedef struct _pixel_rgb888_t {
 #define pixel_rgb888_format BITMAP_FMT_RGB888
 #define pixel_rgb888_to_rgba(p) \
   { p.r, p.g, p.b, 0xff }
+
 #define pixel_rgb888_from_rgb(r, g, b) \
   { r, g, b }
 
+#if WITH_LCD_CLEAR_ALPHA
+#define pixel_rgb888_from_rgba(r, g, b, a) \
+  { (r * a) >> 8, (g * a) >> 8, (b * a) >> 8 }
+#else
+#define pixel_rgb888_from_rgba(r, g, b, a) \
+  pixel_rgb888_from_rgb(r, g, b)
+#endif
+
 static inline void pixel_rgb888_blend_rgba_dark(void* pixel, uint8_t a) {
   uint8_t* p = (uint8_t*)pixel;
 
@@ -136,8 +174,17 @@ typedef struct _pixel_bgr888_t {
 #define pixel_bgr888_format BITMAP_FMT_BGR888
 #define pixel_bgr888_to_rgba(p) \
   { p.r, p.g, p.b, 0xff }
+
 #define pixel_bgr888_from_rgb(r, g, b) \
   { b, g, r }
+#if WITH_LCD_CLEAR_ALPHA
+#define pixel_bgr888_from_rgba(r, g, b, a) \
+  { (b * a) >> 8, (g * a) >> 8, (r * a) >> 8 }
+#else 
+#define pixel_bgr888_from_rgba(r, g, b, a) \
+  pixel_bgr888_from_rgb(r, g, b);
+#endif
+
 static inline void pixel_bgr888_blend_rgba_dark(void* pixel, uint8_t a) {
   uint8_t* p = (uint8_t*)pixel;
 
@@ -174,20 +221,44 @@ typedef struct _pixel_rgba8888_t {
 static inline void pixel_rgba8888_blend_rgba_dark(void* pixel, uint8_t a) {
   uint8_t* p = (uint8_t*)pixel;
 
-  p[0] = (p[0] * a) >> 8;
-  p[1] = (p[1] * a) >> 8;
-  p[2] = (p[2] * a) >> 8;
-  p[3] = 0xff;
+  if(p[3] > 0xf4) {
+    p[0] = (p[0] * a) >> 8;
+    p[1] = (p[1] * a) >> 8;
+    p[2] = (p[2] * a) >> 8;
+    p[3] = 0xff;
+  } else {
+    uint8_t out_a = tk_pixel_limit_uint8(p[3] + a - ((p[3] * a) >> 8));
+
+    if(out_a > 0) {
+      uint8_t d_a = (p[3] * (0xff - a)) >> 8;
+      p[0] = (p[0] * d_a) / out_a;
+      p[1] = (p[1] * d_a) / out_a;
+      p[2] = (p[2] * d_a) / out_a;
+    }
+    p[3] = out_a;
+  }
 }
 
 static inline void pixel_rgba8888_blend_rgba_premulti(void* pixel, rgba_t rgba) {
   uint8_t a = rgba.a;
   uint8_t* p = (uint8_t*)pixel;
 
-  p[0] = ((p[0] * a) >> 8) + rgba.r;
-  p[1] = ((p[1] * a) >> 8) + rgba.g;
-  p[2] = ((p[2] * a) >> 8) + rgba.b;
-  p[3] = 0xff;
+  if(p[3] > 0xf4) {
+    p[0] = ((p[0] * a) >> 8) + rgba.r;
+    p[1] = ((p[1] * a) >> 8) + rgba.g;
+    p[2] = ((p[2] * a) >> 8) + rgba.b;
+    p[3] = 0xff;
+  } else {
+    uint8_t s_a = 0xff - a;
+    uint8_t out_a = tk_pixel_limit_uint8(p[3] + s_a - ((p[3] * s_a) >> 8));
+    if(out_a > 0) {
+      uint8_t d_a = (p[3] * (0xff - rgba.a)) >> 8;
+      p[0] = (p[0] * d_a + (rgba.r << 8)) / out_a;
+      p[1] = (p[1] * d_a + (rgba.g << 8)) / out_a;
+      p[2] = (p[2] * d_a + (rgba.b << 8)) / out_a;
+    }
+    p[3] = out_a;
+  }
 }
 
 typedef struct _pixel_abgr8888_t {
@@ -208,19 +279,45 @@ typedef struct _pixel_abgr8888_t {
   { a, b, g, r }
 static inline void pixel_abgr8888_blend_rgba_dark(void* pixel, uint8_t a) {
   uint8_t* p = (uint8_t*)pixel;
-  p[0] = 0xff;
-  p[1] = (p[1] * a) >> 8;
-  p[2] = (p[2] * a) >> 8;
-  p[3] = (p[3] * a) >> 8;
+
+  if(p[3] > 0xf4) {
+    p[0] = 0xff;
+    p[1] = (p[1] * a) >> 8;
+    p[2] = (p[2] * a) >> 8;
+    p[3] = (p[3] * a) >> 8;
+  } else {
+    uint8_t s_a = 0xff - a;
+    uint8_t out_a = tk_pixel_limit_uint8(p[0] + s_a - ((p[0] * s_a) >> 8));
+    if(out_a > 0) {
+      uint8_t d_a = (p[0] * (0xff - a)) >> 8;
+      p[1] = (p[1] * d_a) / out_a;
+      p[2] = (p[2] * d_a) / out_a;
+      p[3] = (p[3] * d_a) / out_a;
+    }
+    p[0] = out_a;
+  }
 }
 
 static inline void pixel_abgr8888_blend_rgba_premulti(void* pixel, rgba_t rgba) {
   uint8_t a = rgba.a;
   uint8_t* p = (uint8_t*)pixel;
-  p[0] = 0xff;
-  p[1] = ((p[1] * a) >> 8) + rgba.b;
-  p[2] = ((p[2] * a) >> 8) + rgba.g;
-  p[3] = ((p[3] * a) >> 8) + rgba.r;
+
+  if(p[3] > 0xf4) {
+    p[0] = 0xff;
+    p[1] = ((p[1] * a) >> 8) + rgba.b;
+    p[2] = ((p[2] * a) >> 8) + rgba.g;
+    p[3] = ((p[3] * a) >> 8) + rgba.r;
+  } else {
+    uint8_t s_a = 0xff - a;
+    uint8_t out_a = tk_pixel_limit_uint8(p[0] + s_a - ((p[0] * s_a) >> 8));
+    if(out_a > 0) {
+      uint8_t d_a = (p[0] * (0xff - rgba.a)) >> 8;
+      p[1] = (p[1] * d_a + (rgba.b << 8)) / out_a;
+      p[2] = (p[2] * d_a + (rgba.g << 8)) / out_a;
+      p[3] = (p[3] * d_a + (rgba.r << 8)) / out_a;
+    }
+    p[0] = out_a;
+  }
 }
 
 typedef struct _pixel_bgra8888_t {
@@ -242,20 +339,44 @@ typedef struct _pixel_bgra8888_t {
 static inline void pixel_bgra8888_blend_rgba_dark(void* pixel, uint8_t a) {
   uint8_t* p = (uint8_t*)pixel;
 
-  p[0] = (p[0] * a) >> 8;
-  p[1] = (p[1] * a) >> 8;
-  p[2] = (p[2] * a) >> 8;
-  p[3] = 0xff;
+  if(p[3] > 0xf4) {
+    p[0] = (p[0] * a) >> 8;
+    p[1] = (p[1] * a) >> 8;
+    p[2] = (p[2] * a) >> 8;
+    p[3] = 0xff;
+  } else {
+    uint8_t s_a = 0xff - a;
+    uint8_t out_a = tk_pixel_limit_uint8(p[3] + s_a - ((p[3] * s_a) >> 8));
+    if(out_a > 0) {
+      uint8_t d_a = (p[3] * (0xff - a)) >> 8;
+      p[0] = (p[0] * d_a) / out_a;
+      p[1] = (p[1] * d_a) / out_a;
+      p[2] = (p[2] * d_a) / out_a;
+    }
+    p[3] = out_a;
+  }
 }
 
 static inline void pixel_bgra8888_blend_rgba_premulti(void* pixel, rgba_t rgba) {
   uint8_t a = rgba.a;
   uint8_t* p = (uint8_t*)pixel;
 
-  p[0] = ((p[0] * a) >> 8) + rgba.b;
-  p[1] = ((p[1] * a) >> 8) + rgba.g;
-  p[2] = ((p[2] * a) >> 8) + rgba.r;
-  p[3] = 0xff;
+  if(p[3] > 0xf4) {
+    p[0] = ((p[0] * a) >> 8) + rgba.b;
+    p[1] = ((p[1] * a) >> 8) + rgba.g;
+    p[2] = ((p[2] * a) >> 8) + rgba.r;
+    p[3] = 0xff;
+  } else {
+    uint8_t s_a = 0xff - a;
+    uint8_t out_a = tk_pixel_limit_uint8(p[3] + s_a - ((p[3] * s_a) >> 8));
+    if(out_a > 0) {
+      uint8_t d_a = (p[3] * (0xff - rgba.a)) >> 8;
+      p[0] = (p[0] * d_a + (rgba.b << 8)) / out_a;
+      p[1] = (p[1] * d_a + (rgba.g << 8)) / out_a;
+      p[2] = (p[2] * d_a + (rgba.r << 8)) / out_a;
+    }
+    p[3] = out_a;
+  }
 }
 
 typedef struct _pixel_argb8888_t {
@@ -276,19 +397,45 @@ typedef struct _pixel_argb8888_t {
   { 0xff, r, g, b }
 static inline void pixel_argb8888_blend_rgba_dark(void* pixel, uint8_t a) {
   uint8_t* p = (uint8_t*)pixel;
-  p[0] = 0xff;
-  p[1] = (p[1] * a) >> 8;
-  p[2] = (p[2] * a) >> 8;
-  p[3] = (p[3] * a) >> 8;
+
+  if(p[3] > 0xf4) {
+    p[0] = 0xff;
+    p[1] = (p[1] * a) >> 8;
+    p[2] = (p[2] * a) >> 8;
+    p[3] = (p[3] * a) >> 8;
+  } else {
+    uint8_t s_a = 0xff - a;
+    uint8_t out_a = tk_pixel_limit_uint8(p[0] + s_a - ((p[0] *s_a) >> 8));
+    if(out_a > 0) {
+      uint8_t d_a = (p[0] * (0xff - a)) >> 8;
+      p[1] = (p[1] * d_a) / out_a;
+      p[2] = (p[2] * d_a) / out_a;
+      p[3] = (p[3] * d_a) / out_a;
+    }
+    p[0] = out_a;
+  }
 }
 
 static inline void pixel_argb8888_blend_rgba_premulti(void* pixel, rgba_t rgba) {
   uint8_t a = rgba.a;
   uint8_t* p = (uint8_t*)pixel;
-  p[0] = 0xff;
-  p[1] = ((p[1] * a) >> 8) + rgba.r;
-  p[2] = ((p[2] * a) >> 8) + rgba.g;
-  p[3] = ((p[3] * a) >> 8) + rgba.b;
+
+  if(p[3] > 0xf4) {
+    p[0] = 0xff;
+    p[1] = ((p[1] * a) >> 8) + rgba.r;
+    p[2] = ((p[2] * a) >> 8) + rgba.g;
+    p[3] = ((p[3] * a) >> 8) + rgba.b;
+  } else {
+    uint8_t s_a = 0xff - a;
+    uint8_t out_a = tk_pixel_limit_uint8(p[0] + s_a - ((p[0] * s_a) >> 8));
+    if(out_a > 0) {
+      uint8_t d_a = (p[0] * (0xff - rgba.a)) >> 8;
+      p[1] = (p[1] * d_a + (rgba.r << 8)) / out_a;
+      p[2] = (p[2] * d_a + (rgba.g << 8)) / out_a;
+      p[3] = (p[3] * d_a + (rgba.b << 8)) / out_a;
+    }
+    p[0] = out_a;
+  }
 }
 
 typedef uint8_t pixel_gray_t;
diff --git a/src/base/widget.c b/src/base/widget.c
index 7512ad8fc..259303263 100644
--- a/src/base/widget.c
+++ b/src/base/widget.c
@@ -501,7 +501,7 @@ ret_t widget_set_pointer_cursor(widget_t* widget, const char* cursor) {
   return widget_set_prop_str(wm, WIDGET_PROP_CURSOR, cursor);
 }
 
-#ifndef WITHOUT_WINDOW_ANIMATORS
+#ifndef WITHOUT_WIDGET_ANIMATORS
 ret_t widget_set_animation(widget_t* widget, const char* animation) {
   return_value_if_fail(widget != NULL && animation != NULL, RET_BAD_PARAMS);
 
diff --git a/src/blend/blend_image_bgr565_bgr565.c b/src/blend/blend_image_bgr565_bgr565.c
index b14428cdd..63259c033 100644
--- a/src/blend/blend_image_bgr565_bgr565.c
+++ b/src/blend/blend_image_bgr565_bgr565.c
@@ -27,7 +27,8 @@
 #define pixel_dst_format pixel_bgr565_format
 #define pixel_dst_to_rgba pixel_bgr565_to_rgba
 #define pixel_dst_from_rgb pixel_bgr565_from_rgb
-#define pixel_dst_from_rgba(r, g, b, a) pixel_bgr565_from_rgb(r, g, b)
+#define pixel_dst_from_rgba pixel_bgr565_from_rgba
+//#define pixel_dst_from_rgba(r, g, b, a) pixel_bgr565_from_rgb(r, g, b)
 
 #define pixel_src_t pixel_bgr565_t
 #define pixel_src_format pixel_bgr565_format
@@ -35,6 +36,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 static inline void blend_a_bgr565_bgra8888(uint8_t* dst, uint8_t* src, uint8_t a) {
diff --git a/src/blend/blend_image_bgr565_bgra8888.c b/src/blend/blend_image_bgr565_bgra8888.c
index 1cd1cbb69..8f7bbc854 100644
--- a/src/blend/blend_image_bgr565_bgra8888.c
+++ b/src/blend/blend_image_bgr565_bgra8888.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_bgr565_format
 #define pixel_dst_to_rgba pixel_bgr565_to_rgba
 #define pixel_dst_from_rgb pixel_bgr565_from_rgb
+#define pixel_dst_from_rgba pixel_bgr565_from_rgba
 
 #define pixel_src_t pixel_bgra8888_t
 #define pixel_src_format pixel_bgra8888_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 static inline void blend_a_bgr565_bgra8888(uint8_t* dst, uint8_t* src, uint8_t alpha) {
diff --git a/src/blend/blend_image_bgr565_rgb565.c b/src/blend/blend_image_bgr565_rgb565.c
index c2c00b5e7..357d29089 100755
--- a/src/blend/blend_image_bgr565_rgb565.c
+++ b/src/blend/blend_image_bgr565_rgb565.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_bgr565_format
 #define pixel_dst_to_rgba pixel_bgr565_to_rgba
 #define pixel_dst_from_rgb pixel_bgr565_from_rgb
+#define pixel_dst_from_rgba pixel_bgr565_from_rgba
 
 #define pixel_src_t pixel_rgb565_t
 #define pixel_src_format pixel_rgb565_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #include "pixel_ops.inc"
diff --git a/src/blend/blend_image_bgr565_rgba8888.c b/src/blend/blend_image_bgr565_rgba8888.c
index 63db3c5cf..5f40e0723 100644
--- a/src/blend/blend_image_bgr565_rgba8888.c
+++ b/src/blend/blend_image_bgr565_rgba8888.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_bgr565_format
 #define pixel_dst_to_rgba pixel_bgr565_to_rgba
 #define pixel_dst_from_rgb pixel_bgr565_from_rgb
+#define pixel_dst_from_rgba pixel_bgr565_from_rgba
 
 #define pixel_src_t pixel_rgba8888_t
 #define pixel_src_format pixel_rgba8888_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 static inline void blend_a_bgr565_rgba8888(uint8_t* dst, uint8_t* src, uint8_t alpha) {
diff --git a/src/blend/blend_image_bgr888_bgr565.c b/src/blend/blend_image_bgr888_bgr565.c
index 1b85891e6..7e36195e0 100644
--- a/src/blend/blend_image_bgr888_bgr565.c
+++ b/src/blend/blend_image_bgr888_bgr565.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_bgr888_format
 #define pixel_dst_to_rgba pixel_bgr888_to_rgba
 #define pixel_dst_from_rgb pixel_bgr888_from_rgb
+#define pixel_dst_from_rgba pixel_bgr888_from_rgba
 
 #define pixel_src_t pixel_bgr565_t
 #define pixel_src_format pixel_bgr565_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #include "pixel_ops.inc"
diff --git a/src/blend/blend_image_bgr888_bgr888.c b/src/blend/blend_image_bgr888_bgr888.c
index aebd25585..878e6c132 100755
--- a/src/blend/blend_image_bgr888_bgr888.c
+++ b/src/blend/blend_image_bgr888_bgr888.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_bgr888_format
 #define pixel_dst_to_rgba pixel_bgr888_to_rgba
 #define pixel_dst_from_rgb pixel_bgr888_from_rgb
+#define pixel_dst_from_rgba pixel_bgr888_from_rgba
 
 #define pixel_src_t pixel_bgr888_t
 #define pixel_src_format pixel_bgr888_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #include "pixel_ops.inc"
diff --git a/src/blend/blend_image_bgr888_bgra8888.c b/src/blend/blend_image_bgr888_bgra8888.c
index ef24615b9..14a641e32 100644
--- a/src/blend/blend_image_bgr888_bgra8888.c
+++ b/src/blend/blend_image_bgr888_bgra8888.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_bgr888_format
 #define pixel_dst_to_rgba pixel_bgr888_to_rgba
 #define pixel_dst_from_rgb pixel_bgr888_from_rgb
+#define pixel_dst_from_rgba pixel_bgr888_from_rgba
 
 #define pixel_src_t pixel_bgra8888_t
 #define pixel_src_format pixel_bgra8888_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #include "pixel_ops.inc"
diff --git a/src/blend/blend_image_bgr888_rgb565.c b/src/blend/blend_image_bgr888_rgb565.c
index 76a50c6c8..0c1830ee9 100755
--- a/src/blend/blend_image_bgr888_rgb565.c
+++ b/src/blend/blend_image_bgr888_rgb565.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_bgr888_format
 #define pixel_dst_to_rgba pixel_bgr888_to_rgba
 #define pixel_dst_from_rgb pixel_bgr888_from_rgb
+#define pixel_dst_from_rgba pixel_bgr888_from_rgba
 
 #define pixel_src_t pixel_rgb565_t
 #define pixel_src_format pixel_rgb565_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #include "pixel_ops.inc"
diff --git a/src/blend/blend_image_bgr888_rgba8888.c b/src/blend/blend_image_bgr888_rgba8888.c
index fa2bc15c6..b1f0b260e 100644
--- a/src/blend/blend_image_bgr888_rgba8888.c
+++ b/src/blend/blend_image_bgr888_rgba8888.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_bgr888_format
 #define pixel_dst_to_rgba pixel_bgr888_to_rgba
 #define pixel_dst_from_rgb pixel_bgr888_from_rgb
+#define pixel_dst_from_rgba pixel_bgr888_from_rgba
 
 #define pixel_src_t pixel_rgba8888_t
 #define pixel_src_format pixel_rgba8888_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #include "pixel_ops.inc"
diff --git a/src/blend/blend_image_bgra8888_bgr565.c b/src/blend/blend_image_bgra8888_bgr565.c
index b4f118aef..d27a3ebcb 100644
--- a/src/blend/blend_image_bgra8888_bgr565.c
+++ b/src/blend/blend_image_bgra8888_bgr565.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_bgra8888_format
 #define pixel_dst_to_rgba pixel_bgra8888_to_rgba
 #define pixel_dst_from_rgb pixel_bgra8888_from_rgb
+#define pixel_dst_from_rgba pixel_bgra8888_from_rgba
 
 #define pixel_src_t pixel_bgr565_t
 #define pixel_src_format pixel_bgr565_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #include "pixel_ops.inc"
diff --git a/src/blend/blend_image_bgra8888_bgra8888.c b/src/blend/blend_image_bgra8888_bgra8888.c
index 43f8b79a3..1b1f79dcb 100644
--- a/src/blend/blend_image_bgra8888_bgra8888.c
+++ b/src/blend/blend_image_bgra8888_bgra8888.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_bgra8888_format
 #define pixel_dst_to_rgba pixel_bgra8888_to_rgba
 #define pixel_dst_from_rgb pixel_bgra8888_from_rgb
+#define pixel_dst_from_rgba pixel_bgra8888_from_rgba
 
 #define pixel_src_t pixel_bgra8888_t
 #define pixel_src_format pixel_bgra8888_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #include "pixel_ops.inc"
diff --git a/src/blend/blend_image_bgra8888_rgb565.c b/src/blend/blend_image_bgra8888_rgb565.c
index bd085678d..e09da9d73 100755
--- a/src/blend/blend_image_bgra8888_rgb565.c
+++ b/src/blend/blend_image_bgra8888_rgb565.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_bgra8888_format
 #define pixel_dst_to_rgba pixel_bgra8888_to_rgba
 #define pixel_dst_from_rgb pixel_bgra8888_from_rgb
+#define pixel_dst_from_rgba pixel_bgra8888_from_rgba
 
 #define pixel_src_t pixel_rgb565_t
 #define pixel_src_format pixel_rgb565_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #include "pixel_ops.inc"
diff --git a/src/blend/blend_image_bgra8888_rgba8888.c b/src/blend/blend_image_bgra8888_rgba8888.c
index 5aff6f352..bba86f9d7 100644
--- a/src/blend/blend_image_bgra8888_rgba8888.c
+++ b/src/blend/blend_image_bgra8888_rgba8888.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_bgra8888_format
 #define pixel_dst_to_rgba pixel_bgra8888_to_rgba
 #define pixel_dst_from_rgb pixel_bgra8888_from_rgb
+#define pixel_dst_from_rgba pixel_bgra8888_from_rgba
 
 #define pixel_src_t pixel_rgba8888_t
 #define pixel_src_format pixel_rgba8888_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #include "pixel_ops.inc"
diff --git a/src/blend/blend_image_rgb565_bgr565.c b/src/blend/blend_image_rgb565_bgr565.c
index 0ccd76e92..95926b6e5 100644
--- a/src/blend/blend_image_rgb565_bgr565.c
+++ b/src/blend/blend_image_rgb565_bgr565.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_rgb565_format
 #define pixel_dst_to_rgba pixel_rgb565_to_rgba
 #define pixel_dst_from_rgb pixel_rgb565_from_rgb
+#define pixel_dst_from_rgba pixel_rgb565_from_rgba
 
 #define pixel_src_t pixel_bgr565_t
 #define pixel_src_format pixel_bgr565_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #include "pixel_ops.inc"
diff --git a/src/blend/blend_image_rgb565_bgra8888.c b/src/blend/blend_image_rgb565_bgra8888.c
index b9be7bd51..cda42e182 100644
--- a/src/blend/blend_image_rgb565_bgra8888.c
+++ b/src/blend/blend_image_rgb565_bgra8888.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_rgb565_format
 #define pixel_dst_to_rgba pixel_rgb565_to_rgba
 #define pixel_dst_from_rgb pixel_rgb565_from_rgb
+#define pixel_dst_from_rgba pixel_rgb565_from_rgba
 
 #define pixel_src_t pixel_bgra8888_t
 #define pixel_src_format pixel_bgra8888_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #include "pixel_ops.inc"
diff --git a/src/blend/blend_image_rgb565_rgb565.c b/src/blend/blend_image_rgb565_rgb565.c
index 6d3bab97f..865178cab 100755
--- a/src/blend/blend_image_rgb565_rgb565.c
+++ b/src/blend/blend_image_rgb565_rgb565.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_rgb565_format
 #define pixel_dst_to_rgba pixel_rgb565_to_rgba
 #define pixel_dst_from_rgb pixel_rgb565_from_rgb
+#define pixel_dst_from_rgba pixel_rgb565_from_rgba
 
 #define pixel_src_t pixel_rgb565_t
 #define pixel_src_format pixel_rgb565_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #include "pixel_ops.inc"
diff --git a/src/blend/blend_image_rgb565_rgba8888.c b/src/blend/blend_image_rgb565_rgba8888.c
index 378d578b9..ea8a34a0d 100644
--- a/src/blend/blend_image_rgb565_rgba8888.c
+++ b/src/blend/blend_image_rgb565_rgba8888.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_rgb565_format
 #define pixel_dst_to_rgba pixel_rgb565_to_rgba
 #define pixel_dst_from_rgb pixel_rgb565_from_rgb
+#define pixel_dst_from_rgba pixel_rgb565_from_rgba
 
 #define pixel_src_t pixel_rgba8888_t
 #define pixel_src_format pixel_rgba8888_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #include "pixel_ops.inc"
diff --git a/src/blend/blend_image_rgb888_bgr565.c b/src/blend/blend_image_rgb888_bgr565.c
index c84d78fbb..cb5401ba3 100644
--- a/src/blend/blend_image_rgb888_bgr565.c
+++ b/src/blend/blend_image_rgb888_bgr565.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_rgb888_format
 #define pixel_dst_to_rgba pixel_rgb888_to_rgba
 #define pixel_dst_from_rgb pixel_rgb888_from_rgb
+#define pixel_dst_from_rgba pixel_rgb888_from_rgba
 
 #define pixel_src_t pixel_bgr565_t
 #define pixel_src_format pixel_bgr565_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #include "pixel_ops.inc"
diff --git a/src/blend/blend_image_rgb888_bgra8888.c b/src/blend/blend_image_rgb888_bgra8888.c
index 131d21e9e..4998aaef9 100644
--- a/src/blend/blend_image_rgb888_bgra8888.c
+++ b/src/blend/blend_image_rgb888_bgra8888.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_rgb888_format
 #define pixel_dst_to_rgba pixel_rgb888_to_rgba
 #define pixel_dst_from_rgb pixel_rgb888_from_rgb
+#define pixel_dst_from_rgba pixel_rgb888_from_rgba
 
 #define pixel_src_t pixel_bgra8888_t
 #define pixel_src_format pixel_bgra8888_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #include "pixel_ops.inc"
diff --git a/src/blend/blend_image_rgb888_rgb565.c b/src/blend/blend_image_rgb888_rgb565.c
index a06f6ee49..29a08b97d 100755
--- a/src/blend/blend_image_rgb888_rgb565.c
+++ b/src/blend/blend_image_rgb888_rgb565.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_rgb888_format
 #define pixel_dst_to_rgba pixel_rgb888_to_rgba
 #define pixel_dst_from_rgb pixel_rgb888_from_rgb
+#define pixel_dst_from_rgba pixel_rgb888_from_rgba
 
 #define pixel_src_t pixel_rgb565_t
 #define pixel_src_format pixel_rgb565_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #include "pixel_ops.inc"
diff --git a/src/blend/blend_image_rgb888_rgb888.c b/src/blend/blend_image_rgb888_rgb888.c
index a4ae26ddc..2caa29f26 100755
--- a/src/blend/blend_image_rgb888_rgb888.c
+++ b/src/blend/blend_image_rgb888_rgb888.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_rgb888_format
 #define pixel_dst_to_rgba pixel_rgb888_to_rgba
 #define pixel_dst_from_rgb pixel_rgb888_from_rgb
+#define pixel_dst_from_rgba pixel_rgb888_from_rgba
 
 #define pixel_src_t pixel_rgb888_t
 #define pixel_src_format pixel_rgb888_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #include "pixel_ops.inc"
diff --git a/src/blend/blend_image_rgb888_rgba8888.c b/src/blend/blend_image_rgb888_rgba8888.c
index 1b97832c5..b25cda691 100644
--- a/src/blend/blend_image_rgb888_rgba8888.c
+++ b/src/blend/blend_image_rgb888_rgba8888.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_rgb888_format
 #define pixel_dst_to_rgba pixel_rgb888_to_rgba
 #define pixel_dst_from_rgb pixel_rgb888_from_rgb
+#define pixel_dst_from_rgba pixel_rgb888_from_rgba
 
 #define pixel_src_t pixel_rgba8888_t
 #define pixel_src_format pixel_rgba8888_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #include "pixel_ops.inc"
diff --git a/src/blend/blend_image_rgba8888_bgr565.c b/src/blend/blend_image_rgba8888_bgr565.c
index 550ef89e7..8a56676de 100644
--- a/src/blend/blend_image_rgba8888_bgr565.c
+++ b/src/blend/blend_image_rgba8888_bgr565.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_rgba8888_format
 #define pixel_dst_to_rgba pixel_rgba8888_to_rgba
 #define pixel_dst_from_rgb pixel_rgba8888_from_rgb
+#define pixel_dst_from_rgba pixel_rgba8888_from_rgba
 
 #define pixel_src_t pixel_bgr565_t
 #define pixel_src_format pixel_bgr565_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #include "pixel_ops.inc"
diff --git a/src/blend/blend_image_rgba8888_bgra8888.c b/src/blend/blend_image_rgba8888_bgra8888.c
index a2c388843..db0d34966 100644
--- a/src/blend/blend_image_rgba8888_bgra8888.c
+++ b/src/blend/blend_image_rgba8888_bgra8888.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_rgba8888_format
 #define pixel_dst_to_rgba pixel_rgba8888_to_rgba
 #define pixel_dst_from_rgb pixel_rgba8888_from_rgb
+#define pixel_dst_from_rgba pixel_rgba8888_from_rgba
 
 #define pixel_src_t pixel_bgra8888_t
 #define pixel_src_format pixel_bgra8888_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #include "pixel_ops.inc"
diff --git a/src/blend/blend_image_rgba8888_rgb565.c b/src/blend/blend_image_rgba8888_rgb565.c
index 2b6f3697d..6dc2f0b8a 100755
--- a/src/blend/blend_image_rgba8888_rgb565.c
+++ b/src/blend/blend_image_rgba8888_rgb565.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_rgba8888_format
 #define pixel_dst_to_rgba pixel_rgba8888_to_rgba
 #define pixel_dst_from_rgb pixel_rgba8888_from_rgb
+#define pixel_dst_from_rgba pixel_rgba8888_from_rgba
 
 #define pixel_src_t pixel_rgb565_t
 #define pixel_src_format pixel_rgb565_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #include "pixel_ops.inc"
diff --git a/src/blend/blend_image_rgba8888_rgba8888.c b/src/blend/blend_image_rgba8888_rgba8888.c
index 7bae2ab7a..bc7f9adc6 100644
--- a/src/blend/blend_image_rgba8888_rgba8888.c
+++ b/src/blend/blend_image_rgba8888_rgba8888.c
@@ -27,6 +27,7 @@
 #define pixel_dst_format pixel_rgba8888_format
 #define pixel_dst_to_rgba pixel_rgba8888_to_rgba
 #define pixel_dst_from_rgb pixel_rgba8888_from_rgb
+#define pixel_dst_from_rgba pixel_rgba8888_from_rgba
 
 #define pixel_src_t pixel_rgba8888_t
 #define pixel_src_format pixel_rgba8888_format
@@ -34,6 +35,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #include "pixel_ops.inc"
diff --git a/src/blend/fill_image.inc b/src/blend/fill_image.inc
index 2d814355a..a6baf4b65 100644
--- a/src/blend/fill_image.inc
+++ b/src/blend/fill_image.inc
@@ -11,7 +11,7 @@ static ret_t clear_image(bitmap_t* dst, rect_t* dst_r, color_t c) {
   pixel_dst_t data = pixel_dst_from_rgba(c.rgba.r, c.rgba.g, c.rgba.b, c.rgba.a);
 
   dst_data = bitmap_lock_buffer_for_write(dst);
-  return_value_if_fail(dst_data != NULL, RET_BAD_PARAMS);
+  return_value_if_fail(dst_data != NULL && dst_r->w > 0 && dst_r->h > 0, RET_BAD_PARAMS);
 
   if (dst->w == dst_r->w && (dst->w * bpp) == line_length && dst->h == dst_r->h) {
     uint32_t size = w * h;
@@ -50,7 +50,7 @@ static ret_t fill_image(bitmap_t* dst, rect_t* dst_r, color_t c) {
   uint32_t a = c.rgba.a;
 
   if (a > 0xf8) {
-    clear_image(dst, dst_r, c);
+    return clear_image(dst, dst_r, c);
   } else {
     int x = 0;
     int y = 0;
@@ -70,7 +70,7 @@ static ret_t fill_image(bitmap_t* dst, rect_t* dst_r, color_t c) {
     rgba.a = minus_a;
 
     dst_data = bitmap_lock_buffer_for_write(dst);
-    return_value_if_fail(dst_data != NULL, RET_BAD_PARAMS);
+    return_value_if_fail(dst_data != NULL && dst_r->w > 0 && dst_r->h > 0, RET_BAD_PARAMS);
 
     for (y = 0; y < h; y++) {
       p = (pixel_dst_t*)(dst_data + (dst_r->y + y) * line_length + dst_r->x * bpp);
diff --git a/src/blend/fill_image_abgr8888.c b/src/blend/fill_image_abgr8888.c
index 2cc2ba132..b60d59eeb 100644
--- a/src/blend/fill_image_abgr8888.c
+++ b/src/blend/fill_image_abgr8888.c
@@ -31,6 +31,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #define pixel_blend_rgba_dark pixel_abgr8888_blend_rgba_dark
diff --git a/src/blend/fill_image_argb8888.c b/src/blend/fill_image_argb8888.c
index edbb17f29..c04555b88 100644
--- a/src/blend/fill_image_argb8888.c
+++ b/src/blend/fill_image_argb8888.c
@@ -31,6 +31,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #define pixel_blend_rgba_dark pixel_argb8888_blend_rgba_dark
diff --git a/src/blend/fill_image_bgr565.c b/src/blend/fill_image_bgr565.c
index b7f91591c..3336d28c4 100644
--- a/src/blend/fill_image_bgr565.c
+++ b/src/blend/fill_image_bgr565.c
@@ -27,10 +27,12 @@
 #define pixel_dst_format pixel_bgr565_format
 #define pixel_dst_to_rgba pixel_bgr565_to_rgba
 #define pixel_dst_from_rgb pixel_bgr565_from_rgb
-#define pixel_dst_from_rgba(r, g, b, a) pixel_bgr565_from_rgb(r, g, b)
+#define pixel_dst_from_rgba pixel_bgr565_from_rgba
+// #define pixel_dst_from_rgba(r, g, b, a) pixel_bgr565_from_rgb(r, g, b)
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 #define pixel_blend_rgba_dark pixel_bgr565_blend_rgba_dark
 #define pixel_blend_rgba_premulti pixel_bgr565_blend_rgba_premulti
diff --git a/src/blend/fill_image_bgr888.c b/src/blend/fill_image_bgr888.c
index e7e4f151e..77fd26862 100644
--- a/src/blend/fill_image_bgr888.c
+++ b/src/blend/fill_image_bgr888.c
@@ -27,10 +27,12 @@
 #define pixel_dst_format pixel_bgr888_format
 #define pixel_dst_to_rgba pixel_bgr888_to_rgba
 #define pixel_dst_from_rgb pixel_bgr888_from_rgb
-#define pixel_dst_from_rgba(r, g, b, a) pixel_bgr888_from_rgb(r, g, b)
+#define pixel_dst_from_rgba pixel_bgr888_from_rgba
+// #define pixel_dst_from_rgba(r, g, b, a) pixel_bgr888_from_rgb(r, g, b)
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 #define pixel_blend_rgba_dark pixel_bgr888_blend_rgba_dark
 #define pixel_blend_rgba_premulti pixel_bgr888_blend_rgba_premulti
diff --git a/src/blend/fill_image_bgra8888.c b/src/blend/fill_image_bgra8888.c
index 3f5fbca0c..707f26e17 100644
--- a/src/blend/fill_image_bgra8888.c
+++ b/src/blend/fill_image_bgra8888.c
@@ -31,6 +31,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #define pixel_blend_rgba_dark pixel_bgra8888_blend_rgba_dark
diff --git a/src/blend/fill_image_rgb565.c b/src/blend/fill_image_rgb565.c
index 241280242..66fb4819e 100644
--- a/src/blend/fill_image_rgb565.c
+++ b/src/blend/fill_image_rgb565.c
@@ -27,10 +27,12 @@
 #define pixel_dst_format pixel_rgb565_format
 #define pixel_dst_to_rgba pixel_rgb565_to_rgba
 #define pixel_dst_from_rgb pixel_rgb565_from_rgb
-#define pixel_dst_from_rgba(r, g, b, a) pixel_rgb565_from_rgb(r, g, b)
+#define pixel_dst_from_rgba pixel_rgb565_from_rgba
+// #define pixel_dst_from_rgba(r, g, b, a) pixel_rgb565_from_rgb(r, g, b)
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 #define pixel_blend_rgba_dark pixel_rgb565_blend_rgba_dark
 #define pixel_blend_rgba_premulti pixel_rgb565_blend_rgba_premulti
diff --git a/src/blend/fill_image_rgb888.c b/src/blend/fill_image_rgb888.c
index 3d13dc0f2..1af66e3d0 100644
--- a/src/blend/fill_image_rgb888.c
+++ b/src/blend/fill_image_rgb888.c
@@ -27,10 +27,12 @@
 #define pixel_dst_format pixel_rgb888_format
 #define pixel_dst_to_rgba pixel_rgb888_to_rgba
 #define pixel_dst_from_rgb pixel_rgb888_from_rgb
-#define pixel_dst_from_rgba(r, g, b, a) pixel_rgb888_from_rgb(r, g, b)
+#define pixel_dst_from_rgba pixel_rgb888_from_rgba
+// #define pixel_dst_from_rgba(r, g, b, a) pixel_rgb888_from_rgb(r, g, b)
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 #define pixel_blend_rgba_dark pixel_rgb888_blend_rgba_dark
 #define pixel_blend_rgba_premulti pixel_rgb888_blend_rgba_premulti
diff --git a/src/blend/fill_image_rgba8888.c b/src/blend/fill_image_rgba8888.c
index 3cf452785..161ad340e 100644
--- a/src/blend/fill_image_rgba8888.c
+++ b/src/blend/fill_image_rgba8888.c
@@ -31,6 +31,7 @@
 
 #define pixel_t pixel_dst_t
 #define pixel_from_rgb pixel_dst_from_rgb
+#define pixel_from_rgba pixel_dst_from_rgba
 #define pixel_to_rgba pixel_dst_to_rgba
 
 #define pixel_blend_rgba_dark pixel_rgba8888_blend_rgba_dark
diff --git a/src/blend/pixel_ops.inc b/src/blend/pixel_ops.inc
index 592c18afc..bc1a7d8c5 100644
--- a/src/blend/pixel_ops.inc
+++ b/src/blend/pixel_ops.inc
@@ -19,65 +19,166 @@
  *
  */
 
+static inline uint8_t tk_pixel_ops_limit_uint8(int32_t tmp) {
+  if(tmp > 0xff) {
+    tmp = 0xff;
+  } else if(tmp < 0) {
+    tmp = 0;
+  }
+  return (uint8_t)tmp;
+}
+
 static inline pixel_t blend_color(color_t bg, color_t fg, uint8_t a) {
-  uint8_t minus_a = 0xff - a;
+  if(a > 0xf4) { 
+    uint8_t minus_a = 0xff - a;
 
-  uint8_t r = (bg.rgba.r * minus_a + fg.rgba.r * a) >> 8;
-  uint8_t g = (bg.rgba.g * minus_a + fg.rgba.g * a) >> 8;
-  uint8_t b = (bg.rgba.b * minus_a + fg.rgba.b * a) >> 8;
-  pixel_t p = pixel_from_rgb(r, g, b);
+    uint8_t r = (bg.rgba.r * minus_a + fg.rgba.r * a) >> 8;
+    uint8_t g = (bg.rgba.g * minus_a + fg.rgba.g * a) >> 8;
+    uint8_t b = (bg.rgba.b * minus_a + fg.rgba.b * a) >> 8;
+    pixel_t p = pixel_from_rgb(r, g, b);
 
-  return p;
+    return p;
+  } else {
+    uint8_t fg_a = (fg.rgba.a * a) >> 8;
+    uint8_t out_a = tk_pixel_ops_limit_uint8(bg.rgba.a + fg_a - ((bg.rgba.a * fg_a) >> 8));
+    if(out_a > 0) {
+      uint8_t d_a = (bg.rgba.a * (0xff - fg_a)) >> 8;
+      uint8_t r = (bg.rgba.r * d_a + fg.rgba.r * fg_a) / out_a;
+      uint8_t g = (bg.rgba.g * d_a + fg.rgba.g * fg_a) / out_a;
+      uint8_t b = (bg.rgba.b * d_a + fg.rgba.b * fg_a) / out_a;
+      pixel_t p = pixel_from_rgba(r, g, b, out_a);
+      return p;
+    } else {
+      pixel_t p = pixel_from_rgba(0x0, 0x0, 0x0, 0x0);
+      return p;
+    }
+  }
 }
 
 static inline pixel_t blend_pixel(pixel_t pixel, color_t c) {
   uint8_t a = c.rgba.a;
   uint8_t minus_a = 0xff - a;
   rgba_t rgba = pixel_to_rgba(pixel);
+  
+  if(rgba.a > 0xf4) { 
+    uint8_t r = (rgba.r * minus_a + c.rgba.r * a) >> 8;
+    uint8_t g = (rgba.g * minus_a + c.rgba.g * a) >> 8;
+    uint8_t b = (rgba.b * minus_a + c.rgba.b * a) >> 8;
+    pixel_t p = pixel_from_rgb(r, g, b);
 
-  uint8_t r = (rgba.r * minus_a + c.rgba.r * a) >> 8;
-  uint8_t g = (rgba.g * minus_a + c.rgba.g * a) >> 8;
-  uint8_t b = (rgba.b * minus_a + c.rgba.b * a) >> 8;
-  pixel_t p = pixel_from_rgb(r, g, b);
-
-  return p;
+    return p;
+  } else {
+    uint8_t out_a = tk_pixel_ops_limit_uint8(c.rgba.a + rgba.a - ((c.rgba.a * rgba.a) >> 8));
+    if(out_a > 0) {
+      uint8_t d_a = (rgba.a * (0xff - c.rgba.a)) >> 8;
+      uint8_t r = (rgba.r * d_a + c.rgba.r * c.rgba.a) / out_a;
+      uint8_t g = (rgba.g * d_a + c.rgba.g * c.rgba.a) / out_a;
+      uint8_t b = (rgba.b * d_a + c.rgba.b * c.rgba.a) / out_a;
+      pixel_t p = pixel_from_rgba(r, g, b, out_a);
+      return p;
+    } else {
+      pixel_t p = pixel_from_rgba(0x0, 0x0, 0x0, 0x0);
+      return p;
+    }
+  }
 }
 
 static inline pixel_t blend_alpha(color_t fg, uint8_t a) {
-  uint8_t r = (fg.rgba.r * a) >> 8;
-  uint8_t g = (fg.rgba.g * a) >> 8;
-  uint8_t b = (fg.rgba.b * a) >> 8;
-  pixel_t p = pixel_from_rgb(r, g, b);
+  if(fg.rgba.a > 0xf4) {
+    uint8_t r = (fg.rgba.r * a) >> 8;
+    uint8_t g = (fg.rgba.g * a) >> 8;
+    uint8_t b = (fg.rgba.b * a) >> 8;
+    pixel_t p = pixel_from_rgb(r, g, b);
 
-  return p;
+    return p;
+  } else {
+
+    uint8_t out_a =tk_pixel_ops_limit_uint8(a + fg.rgba.a - ((a * fg.rgba.a) >> 8));
+    if(out_a > 0) {
+      uint8_t d_a = (fg.rgba.a * (0xff - a)) >> 8;
+      uint8_t r = (fg.rgba.r * d_a) / out_a;
+      uint8_t g = (fg.rgba.g * d_a) / out_a;
+      uint8_t b = (fg.rgba.b * d_a) / out_a;
+      pixel_t p = pixel_from_rgba(r, g, b, out_a);
+      return p;
+    } else {
+      pixel_t p = pixel_from_rgba(0x0, 0x0, 0x0, 0x0);
+      return p;
+    }
+  }
 }
 
 static inline pixel_t blend_rgba(rgba_t d, rgba_t s, uint8_t a) {
-  uint8_t minus_a = 0xff - a;
-  uint8_t r = (d.r * minus_a + s.r * a) >> 8;
-  uint8_t g = (d.g * minus_a + s.g * a) >> 8;
-  uint8_t b = (d.b * minus_a + s.b * a) >> 8;
-  pixel_t p = pixel_from_rgb(r, g, b);
+  if(d.a > 0xf4) {
+    uint8_t minus_a = 0xff - a;
+    uint8_t r = (d.r * minus_a + s.r * a) >> 8;
+    uint8_t g = (d.g * minus_a + s.g * a) >> 8;
+    uint8_t b = (d.b * minus_a + s.b * a) >> 8;
 
-  return p;
+    pixel_t p = pixel_from_rgb(r, g, b);
+    return p;
+  } else {
+    uint8_t out_a = tk_pixel_ops_limit_uint8(s.a + d.a - ((s.a * d.a) >> 8));
+    if(out_a > 0) {
+      uint8_t d_a = (d.a * (0xff - s.a)) >> 8;
+      uint8_t r = (d.r * d_a + s.r * s.a) / out_a;
+      uint8_t g = (d.g * d_a + s.g * s.a) / out_a;
+      uint8_t b = (d.b * d_a + s.b * s.a) / out_a;
+      pixel_t p = pixel_from_rgba(r, g, b, out_a);
+      return p;
+    } else {
+      pixel_t p = pixel_from_rgba(0x0, 0x0, 0x0, 0x0);
+      return p;
+    }
+  }
 }
 
 static inline pixel_t blend_rgba_premulti(rgba_t d, rgba_t s, uint8_t a) {
-  uint8_t r = ((d.r * a) >> 8) + s.r;
-  uint8_t g = ((d.g * a) >> 8) + s.g;
-  uint8_t b = ((d.b * a) >> 8) + s.b;
+  if(d.a > 0xf4) {
+    uint8_t r = ((d.r * a) >> 8) + s.r;
+    uint8_t g = ((d.g * a) >> 8) + s.g;
+    uint8_t b = ((d.b * a) >> 8) + s.b;
 
-  pixel_t p = pixel_from_rgb(r, g, b);
-
-  return p;
+    pixel_t p = pixel_from_rgb(r, g, b);
+    return p;
+  } else {
+    uint8_t out_a = tk_pixel_ops_limit_uint8(s.a + d.a - ((s.a * d.a) >> 8));
+    if(out_a > 0) {
+      uint8_t d_a = (d.a * (0xff - s.a)) >> 8;
+      uint8_t r = (d.r * d_a + s.r) / out_a;
+      uint8_t g = (d.g * d_a + s.g) / out_a;
+      uint8_t b = (d.b * d_a + s.b) / out_a;
+      pixel_t p = pixel_from_rgba(r, g, b, out_a);
+      return p;
+    } else {
+      pixel_t p = pixel_from_rgba(0x0, 0x0, 0x0, 0x0);
+      return p;
+    }
+  }
 }
 
 static inline pixel_t blend_rgba_dark(rgba_t d, uint8_t a) {
-  uint8_t r = ((d.r * a) >> 8);
-  uint8_t g = ((d.g * a) >> 8);
-  uint8_t b = ((d.b * a) >> 8);
+  if(d.a > 0xf4) {
+    uint8_t r = ((d.r * a) >> 8);
+    uint8_t g = ((d.g * a) >> 8);
+    uint8_t b = ((d.b * a) >> 8);
 
-  pixel_t p = pixel_from_rgb(r, g, b);
+    pixel_t p = pixel_from_rgb(r, g, b);
 
-  return p;
+    return p;
+  } else {
+
+    uint8_t out_a =tk_pixel_ops_limit_uint8(a + d.a - ((a * d.a) >> 8));
+    if(out_a > 0) {
+      uint8_t d_a = (d.a * (0xff - a)) >> 8;
+      uint8_t r  = (d.r * d_a) / out_a;
+      uint8_t g = (d.g * d_a) / out_a;
+      uint8_t b = (d.b * d_a) / out_a;
+      pixel_t p = pixel_from_rgba(r, g, b, out_a);
+      return p;
+    } else {
+      pixel_t p = pixel_from_rgba(0x0, 0x0, 0x0, 0x0);
+      return p;
+    }
+  }
 }
diff --git a/src/dialog_highlighters/dialog_highlighter_default.c b/src/dialog_highlighters/dialog_highlighter_default.c
index f4961cdbc..051331668 100755
--- a/src/dialog_highlighters/dialog_highlighter_default.c
+++ b/src/dialog_highlighters/dialog_highlighter_default.c
@@ -53,6 +53,8 @@ static ret_t dialog_highlighter_default_prepare(dialog_highlighter_t* h, canvas_
 }
 
 static ret_t dialog_highlighter_default_draw(dialog_highlighter_t* h, float_t percent) {
+  rect_t r;
+  rect_t save_r;
   canvas_t* c = h->canvas;
   bitmap_t* img = &(h->img);
   rect_t src = rect_init(0, 0, img->w, img->h);
@@ -64,7 +66,11 @@ static ret_t dialog_highlighter_default_draw(dialog_highlighter_t* h, float_t pe
     canvas_draw_image(c, img, &src, &dst);
     window_manager_paint_system_bar(window_manager(), c);
   } else {
-    lcd_draw_image(c->lcd, img, &src, &dst);
+    canvas_get_clip_rect(c, &save_r);
+    r = rect_intersect(&save_r, &h->clip_rect);
+    canvas_set_clip_rect(c, &r);
+    canvas_draw_image(c, img, &src, &dst);
+    canvas_set_clip_rect(c, &save_r);
   }
 
   /*
diff --git a/src/lcd/lcd_mem.inc b/src/lcd/lcd_mem.inc
index 8afa6a680..0ce9c812c 100644
--- a/src/lcd/lcd_mem.inc
+++ b/src/lcd/lcd_mem.inc
@@ -1,4 +1,4 @@
-/**
+/**
  * File:   lcd_mem.c
  * Author: Li XianJing <xianjimli@hotmail.com>
  * Brief:  mem implemented lcd interface
@@ -74,7 +74,21 @@ static bitmap_t* lcd_mem_init_online_fb(lcd_t* lcd, bitmap_t* fb, lcd_orientatio
 }
 
 static ret_t lcd_mem_begin_frame(lcd_t* lcd, rect_t* dirty_rect) {
+#if WITH_LCD_CLEAR_ALPHA
+  rect_t r;
+  bitmap_t fb;
+  
+  if (lcd->draw_mode == LCD_DRAW_OFFLINE || dirty_rect == NULL) {
+    r = rect_init(0, 0, lcd->w, lcd->h);
+  } else {
+    r = rect_init(dirty_rect->x, dirty_rect->y, dirty_rect->w, dirty_rect->h);
+  }
+
+  lcd_mem_init_drawing_fb(lcd, &fb);
+  return image_clear(&fb, &r, color_init(0x0, 0x0, 0x0, 0x0));
+#else
   return RET_OK;
+#endif
 }
 
 static ret_t lcd_mem_fill_rect_with_color(lcd_t* lcd, xy_t x, xy_t y, wh_t w, wh_t h, color_t c) {
diff --git a/src/lcd/lcd_mem_bgr565.c b/src/lcd/lcd_mem_bgr565.c
index 4c0177163..646aec090 100644
--- a/src/lcd/lcd_mem_bgr565.c
+++ b/src/lcd/lcd_mem_bgr565.c
@@ -29,6 +29,7 @@
 #define pixel_bpp pixel_bgr565_BPP
 #define pixel_to_rgba pixel_bgr565_to_rgba
 #define pixel_from_rgb pixel_bgr565_from_rgb
+#define pixel_from_rgba pixel_bgr565_from_rgba
 
 #include "blend/pixel_ops.inc"
 #include "lcd/lcd_mem.inc"
diff --git a/src/lcd/lcd_mem_bgr888.c b/src/lcd/lcd_mem_bgr888.c
index 428aef796..824e2ea87 100644
--- a/src/lcd/lcd_mem_bgr888.c
+++ b/src/lcd/lcd_mem_bgr888.c
@@ -29,6 +29,7 @@
 #define pixel_bpp pixel_bgr888_BPP
 #define pixel_to_rgba pixel_bgr888_to_rgba
 #define pixel_from_rgb pixel_bgr888_from_rgb
+#define pixel_from_rgba pixel_bgr888_from_rgba
 
 #include "blend/pixel_ops.inc"
 #include "lcd/lcd_mem.inc"
diff --git a/src/lcd/lcd_mem_bgra8888.c b/src/lcd/lcd_mem_bgra8888.c
index ae2e0a6f9..4ddcee1b8 100644
--- a/src/lcd/lcd_mem_bgra8888.c
+++ b/src/lcd/lcd_mem_bgra8888.c
@@ -29,6 +29,7 @@
 #define pixel_bpp pixel_bgra8888_BPP
 #define pixel_to_rgba pixel_bgra8888_to_rgba
 #define pixel_from_rgb pixel_bgra8888_from_rgb
+#define pixel_from_rgba pixel_bgra8888_from_rgba
 
 #include "blend/pixel_ops.inc"
 #include "lcd/lcd_mem.inc"
diff --git a/src/lcd/lcd_mem_rgb565.c b/src/lcd/lcd_mem_rgb565.c
index f65c722ac..f7b5511c1 100644
--- a/src/lcd/lcd_mem_rgb565.c
+++ b/src/lcd/lcd_mem_rgb565.c
@@ -29,6 +29,7 @@
 #define pixel_bpp pixel_rgb565_BPP
 #define pixel_to_rgba pixel_rgb565_to_rgba
 #define pixel_from_rgb pixel_rgb565_from_rgb
+#define pixel_from_rgba pixel_rgb565_from_rgba
 
 #include "blend/pixel_ops.inc"
 #include "lcd/lcd_mem.inc"
diff --git a/src/lcd/lcd_mem_rgb888.c b/src/lcd/lcd_mem_rgb888.c
index 2d55bb10a..b7a3f1288 100644
--- a/src/lcd/lcd_mem_rgb888.c
+++ b/src/lcd/lcd_mem_rgb888.c
@@ -29,6 +29,7 @@
 #define pixel_bpp pixel_rgb888_BPP
 #define pixel_to_rgba pixel_rgb888_to_rgba
 #define pixel_from_rgb pixel_rgb888_from_rgb
+#define pixel_from_rgba pixel_rgb888_from_rgba
 
 #include "blend/pixel_ops.inc"
 #include "lcd/lcd_mem.inc"
diff --git a/src/lcd/lcd_mem_rgba8888.c b/src/lcd/lcd_mem_rgba8888.c
index 394ee941e..df83fdc5b 100644
--- a/src/lcd/lcd_mem_rgba8888.c
+++ b/src/lcd/lcd_mem_rgba8888.c
@@ -29,6 +29,7 @@
 #define pixel_bpp pixel_rgba8888_BPP
 #define pixel_to_rgba pixel_rgba8888_to_rgba
 #define pixel_from_rgb pixel_rgba8888_from_rgb
+#define pixel_from_rgba pixel_rgba8888_from_rgba
 
 #include "blend/pixel_ops.inc"
 #include "lcd/lcd_mem.inc"
diff --git a/src/lcd/lcd_mem_special.c b/src/lcd/lcd_mem_special.c
index d3e7eddd4..fcf860e72 100644
--- a/src/lcd/lcd_mem_special.c
+++ b/src/lcd/lcd_mem_special.c
@@ -31,7 +31,7 @@
 static ret_t lcd_mem_special_begin_frame(lcd_t* lcd, rect_t* dr) {
   lcd_mem_special_t* special = (lcd_mem_special_t*)lcd;
   lcd_t* mem = (lcd_t*)(special->lcd_mem);
-
+  mem->draw_mode = lcd->draw_mode;
   mem->begin_frame(mem, dr);
 
   return RET_OK;
diff --git a/src/vgcanvas/vgcanvas_nanovg_gl.inc b/src/vgcanvas/vgcanvas_nanovg_gl.inc
index 2f680c2d0..a991f5bce 100644
--- a/src/vgcanvas/vgcanvas_nanovg_gl.inc
+++ b/src/vgcanvas/vgcanvas_nanovg_gl.inc
@@ -11,8 +11,14 @@ static ret_t vgcanvas_nanovg_reinit(vgcanvas_t* vg, uint32_t w, uint32_t h, uint
 }
 
 static inline void vgcanvas_nanovg_set_offline_fb(vgcanvas_nanovg_t* canvas, uint32_t w,
-                                                  uint32_t h) {
+                                                  uint32_t h, rect_t* dirty_rect) {
   GLint default_fbo = 0;
+
+#if WITH_LCD_CLEAR_ALPHA
+  rect_t r;
+  system_info_t* info = system_info();
+#endif
+
   vgcanvas_nanovg_offline_fb_t* offline_fb = canvas->offline_fb;
   if (offline_fb != NULL) {
     glGetIntegerv(GL_FRAMEBUFFER_BINDING, &default_fbo);
@@ -30,6 +36,33 @@ static inline void vgcanvas_nanovg_set_offline_fb(vgcanvas_nanovg_t* canvas, uin
       // 去除这两行注释就可以显示脏矩形的工作原理。
       // glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
       // glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+
+#if WITH_LCD_CLEAR_ALPHA
+      switch (info->lcd_orientation) {
+        case LCD_ORIENTATION_0:
+          r = rect_init(dirty_rect->x, h - dirty_rect->h - dirty_rect->y, dirty_rect->w, dirty_rect->h);
+          break;
+        case LCD_ORIENTATION_90:
+          r = rect_init(w - dirty_rect->h - dirty_rect->y, h - dirty_rect->w - dirty_rect->x, dirty_rect->h, dirty_rect->w);
+          break;
+        case LCD_ORIENTATION_180:
+          r = rect_init(w - dirty_rect->w - dirty_rect->x, dirty_rect->y, dirty_rect->w, dirty_rect->h);
+          break;
+        case LCD_ORIENTATION_270:
+          r = rect_init(dirty_rect->y, dirty_rect->x, dirty_rect->h, dirty_rect->w);
+          break;
+      }
+      
+      // 把脏矩形的区域刷新为黑色透明度为0的颜色
+      glScissor(r.x, r.y, r.w, r.h);
+      glEnable(GL_SCISSOR_TEST);
+      glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
+      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+      glDisable(GL_SCISSOR_TEST);
+#else
+      (void)dirty_rect;
+#endif
+
     }
   }
 }
@@ -44,7 +77,7 @@ static inline void vgcanvas_nanovg_offline_fb_flush(vgcanvas_nanovg_t* canvas) {
     glViewport(0, 0, info->lcd_w * info->device_pixel_ratio,
                info->lcd_h * info->device_pixel_ratio);
 
-    glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
+    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
 
     glUseProgram(shader_info->program_object);
@@ -91,8 +124,6 @@ static ret_t vgcanvas_nanovg_begin_frame(vgcanvas_t* vgcanvas, rect_t* dirty_rec
 
   native_window_gl_make_current(canvas->window);
 
-  vgcanvas_nanovg_set_offline_fb(canvas, info->lcd_w * info->device_pixel_ratio,
-                                 info->lcd_h * info->device_pixel_ratio);
   if (dirty_rect != NULL) {
     canvas->base.dirty_rect = rect_init(dirty_rect->x, dirty_rect->y, dirty_rect->w, dirty_rect->h);
   } else {
@@ -104,6 +135,9 @@ static ret_t vgcanvas_nanovg_begin_frame(vgcanvas_t* vgcanvas, rect_t* dirty_rec
     }
   }
 
+  vgcanvas_nanovg_set_offline_fb(canvas, info->lcd_w * info->device_pixel_ratio,
+                                 info->lcd_h * info->device_pixel_ratio, &canvas->base.dirty_rect);
+
   nvgBeginFrame(canvas->vg, info->lcd_w, info->lcd_h, info->device_pixel_ratio);
 
   switch (info->lcd_orientation) {
@@ -183,9 +217,11 @@ static ret_t vgcanvas_nanovg_bind_fbo(vgcanvas_t* vgcanvas, framebuffer_object_t
   NVGLUframebuffer* handle = (NVGLUframebuffer*)fbo->handle;
   vgcanvas->dirty_rect = rect_init(0, 0, fbo->w, fbo->h);
   nvgluBindFramebuffer(handle);
-  glClearColor(0, 0, 0, 0);
   glViewport(0, 0, fbo->w * fbo->ratio, fbo->h * fbo->ratio);
-  glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+
+  glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
+  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+
   nvgBeginFrame(vg, fbo->w, fbo->h, fbo->ratio);
 
   return RET_OK;
diff --git a/src/window_manager/window_manager_default.c b/src/window_manager/window_manager_default.c
index 1de505c94..3deb2eca8 100644
--- a/src/window_manager/window_manager_default.c
+++ b/src/window_manager/window_manager_default.c
@@ -153,11 +153,10 @@ ret_t window_manager_default_snap_curr_window(widget_t* widget, widget_t* curr_w
 
 ret_t window_manager_default_snap_prev_window(widget_t* widget, widget_t* prev_win, bitmap_t* img,
                                               framebuffer_object_t* fbo, bool_t auto_rotate) {
+  rect_t r = {0};
   canvas_t* c = NULL;
 #ifdef WITH_NANOVG_GPU
   vgcanvas_t* vg = NULL;
-#else
-  rect_t r = {0};
 #endif /*WITH_NANOVG_GPU*/
 
   window_manager_default_t* wm = WINDOW_MANAGER_DEFAULT(widget);
@@ -178,11 +177,13 @@ ret_t window_manager_default_snap_prev_window(widget_t* widget, widget_t* prev_w
   }
   WIDGET_FOR_EACH_CHILD_END()
 
+  r = rect_init(prev_win->x, prev_win->y, prev_win->w, prev_win->h);
+
 #ifdef WITH_NANOVG_GPU
   vg = lcd_get_vgcanvas(c->lcd);
   ENSURE(vgcanvas_create_fbo(vg, fbo) == RET_OK);
   ENSURE(vgcanvas_bind_fbo(vg, fbo) == RET_OK);
-  canvas_set_clip_rect(c, NULL);
+  canvas_set_clip_rect(c, &r);
   ENSURE(widget_on_paint_background(widget, c) == RET_OK);
   window_manager_paint_system_bar(widget, c);
   {
@@ -203,7 +204,6 @@ ret_t window_manager_default_snap_prev_window(widget_t* widget, widget_t* prev_w
   ENSURE(vgcanvas_unbind_fbo(vg, fbo) == RET_OK);
   fbo_to_img(fbo, img);
 #else
-  r = rect_init(prev_win->x, prev_win->y, prev_win->w, prev_win->h);
   ENSURE(canvas_begin_frame(c, &r, LCD_DRAW_OFFLINE) == RET_OK);
   canvas_set_clip_rect(c, &r);
   ENSURE(widget_on_paint_background(widget, c) == RET_OK);
@@ -229,6 +229,7 @@ ret_t window_manager_default_snap_prev_window(widget_t* widget, widget_t* prev_w
 
   if (dialog_highlighter != NULL) {
     dialog_highlighter_set_bg(dialog_highlighter, img, fbo);
+    dialog_highlighter_set_bg_clip_rect(dialog_highlighter, &r);
   }
   wm->curr_win = NULL;
   return RET_OK;