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53 lines
1.9 KiB
C++
Executable File
53 lines
1.9 KiB
C++
Executable File
#include <cdroid.h>
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#include <cdlog.h>
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#include <widget/candidateview.h>
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#include <cairomm/cairomm.h>
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class MyWindow:public Window{
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public:
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MyWindow(int x,int y,int w,int h):Window(x,y,w,h){};
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void onDraw(Canvas&canvas)override{
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LOGD("%p onDraw",this);
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Rect rc={0,0,getWidth(),getHeight()};
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canvas.set_source_rgb(1,0,0);
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canvas.rotate(30);
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//canvas.arc(100,100,50,0,M_PI*2);
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canvas.rectangle(0,0,100,100);
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canvas.clip();
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double x,y,w,h;
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canvas.get_clip_extents(x,y,w,h);
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LOGD("clip=%f,%f,%f,%f",x,y,w,h);
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for(int i=0;i<10;i++){
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canvas.rectangle(rc.left,rc.top,rc.width,rc.height);
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canvas.stroke();
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rc.inflate(-10,-10);
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}
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}
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};
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int main(int argc,const char*argv[]){
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App app(argc,argv);
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Window*w=new MyWindow(0,0,-1,-1);
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// 加载彩色图像
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Cairo::RefPtr<Cairo::ImageSurface> colorImage = Cairo::ImageSurface::create_from_png("bg_1.png");
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// 创建一个灰度图像表面
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Cairo::RefPtr<Cairo::ImageSurface> grayImage = Cairo::ImageSurface::create(Cairo::Surface::Format::ARGB32, colorImage->get_width(), colorImage->get_height());
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// 创建一个绘图上下文
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Cairo::RefPtr<Cairo::Context> cr = Cairo::Context::create(grayImage);
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// 创建一个表面填充对象
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Cairo::RefPtr<Cairo::SurfacePattern> pattern = Cairo::SurfacePattern::create(colorImage);
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// 创建一个变换矩阵来实现灰度滤镜效果
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const long start=SystemClock::uptimeMillis();
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Cairo::Matrix matrix=Cairo::rotation_matrix(M_PI/10.f);//{0.3, 0.59, 0.11, 0, 0, 0}; // 灰度转换矩阵
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// 应用变换矩阵
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pattern->set_matrix(matrix);
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// 使用填充对象填充一个矩形，以实现灰度滤镜效果
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cr->set_source(pattern);
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cr->paint();
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LOGD("used time=%ld",SystemClock::uptimeMillis()-start);
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grayImage->write_to_png("gray.png");
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return app.exec();
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}
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