AGG学习之二----使用像素格式对渲染内存封装

#include "agg_rendering_buffer.h"#include "agg_basics.h"#include "platform/agg_platform_support.h"#include "agg_pixfmt_rgb.h"enum {flip_y = true,};template<class Ren>void draw_black_frame(Ren &ren){agg::rgba8 c(0,0,0);unsigned i;for (i=0; i<ren.height(); ++i){ren.copy_pixel(0, i, c);ren.copy_pixel(ren.width()-1, i, c);}for (i=0; i<ren.width(); ++i){ren.copy_pixel(i, 0, c);ren.copy_pixel(i,ren.height()-1, c);}}class the_application : public agg::platform_support{public:the_application(agg::pix_format_e format, bool flip_y): agg::platform_support(format,flip_y) {} virtual ~the_application() { } virtual void on_init(){} virtual void on_draw() { agg::rendering_buffer rbuf = this->rbuf_window(); agg::pixfmt_rgb24 pixf(rbuf);//底层像素渲染对象，对渲染内存进行包装了 int w = pixf.width(); int h = pixf.height(); memset( rbuf.row_ptr(0), 255, w*h*3 );//绘制白色背景 agg::rgba8 c(127,200,98); unsigned i; for (i=0; i<h/2; ++i)//绘制对角线 { pixf.copy_pixel(i, i,c); } draw_black_frame(pixf); }};int agg_main(int argc, char* argv[]){the_application app(agg::pix_format_bgr24, flip_y);app.caption("My AGG Demo");if(app.init(320, 200, agg::window_resize )){app.run();}return 1;}