Win7 VS2015及MinGW环境编译矢量库agg-2.5和cairo-1.14.6

#include "agg_basics.h" #include "agg_rendering_buffer.h" #include "agg_rasterizer_scanline_aa.h" #include "agg_scanline_u.h" #include "agg_renderer_scanline.h" #include "agg_pixfmt_rgb.h" #include "platform/agg_platform_support.h" #include "agg_ellipse.h" #include "agg_conv_contour.h" #include "agg_conv_stroke.h" #include "agg_conv_marker.h" #include "agg_arrowhead.h" #include "agg_path_storage.h" #include "agg_vcgen_markers_term.h" #include <agg_conv_stroke.h> // conv_stroke #include <agg_conv_dash.h> // conv_dash #include <agg_conv_marker.h> // conv_marker #include <agg_conv_curve.h> // conv_curve #include <agg_conv_contour.h> // conv_contour #include <agg_conv_smooth_poly1.h> // conv_smooth_poly1.h #include <agg_conv_bspline.h> // conv_bspline #include <agg_conv_transform.h> // conv_transform 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 void on_draw() { //Rendering Buffer //用于存放像素点阵数据的内存块，这里是最终形成的图像数据 agg::rendering_buffer &rbuf = rbuf_window(); agg::pixfmt_bgr24 pixf(rbuf); // Renderers typedef agg::renderer_base<agg::pixfmt_bgr24> renderer_base_type; //底层渲染器 renderer_base_type renb(pixf); // typedef agg::renderer_scanline_aa_solid<renderer_base_type> renderer_scanline_type; //高层渲染器 typedef agg::renderer_scanline_bin_solid<renderer_base_type> renderer_scanline_type; //高层渲染器 renderer_scanline_type rensl(renb); /* // Vertex Source //agg::ellipse ell(100,100,50,50); //顶点源，里面存放了一堆2D顶点以及对应的命令，这个顶点源呈现的是一个圆形 agg::triangle ell(100,100,50); // Coordinate conversion pipeline //坐标转换管道，它可以变换Vertex Source中的顶点，比如矩阵变换，轮廓提取，转换为虚线等。 //typedef agg::conv_contour<agg::ellipse> ell_cc_type; //扩展轮廓线 typedef agg::conv_contour<agg::triangle> ell_cc_type; ell_cc_type ccell(ell); typedef agg::conv_stroke<ell_cc_type> ell_cc_cs_type; //只显示轮廓线 ell_cc_cs_type csccell(ccell); */ // Vertex Source agg::ellipse ell(, , , ); // 圆心在中间 // Coordinate conversion pipeline agg::trans_affine mtx; // trans_affine不 仅仅用于源顶点的变换，在AGG库中有不少地方都能看到它 mtx.scale(); // x轴缩小到原来的一半 mtx.rotate(agg::deg2rad()); // 旋转30度 mtx.translate(, ); // 平移100,100 typedef agg::conv_transform<agg::ellipse> ell_ct_type; ell_ct_type ctell(ell, mtx); // 矩阵变换 typedef agg::conv_contour<ell_ct_type> ell_cc_type; ell_cc_type ccell(ctell); // 轮廓变换 typedef agg::conv_dash<ell_cc_type> ell_cd_type; ell_cd_type cdccell(ccell); cdccell.add_dash(, ); typedef agg::conv_stroke<ell_cd_type> ell_cc_cs_type; // ell_cc_cs_type csccell(ccell); // 转换成多义线 ell_cc_cs_type csccell(cdccell); // csccell.width(3); // Scanline Rasterizer //把顶点数据（矢量数据）转换成一组水平扫描线，扫描线由一组线段(Span)组成，线段(Span)包含了起始位置、长度和覆盖率（可以理解为透明度）信息。AGG的抗锯齿（Anti-Aliasing）功能也是在这时引入的。 agg::rasterizer_scanline_aa<> ras; agg::scanline_u8 sl; // Draw renb.clear(agg::rgba8(, , )); // renb.clip_box(30,30,160,160); // 设置可写区域 ; i<; i++) { ccell.width(i * ); ras.add_path(csccell); rensl.color(agg::rgba8(, , i * )); // agg::render_scanlines(ras,sl,rensl); agg::render_scanlines_aa_solid(ras, sl, renb, agg::rgba8(, , i * )); } ; ++i; agg::path_storage ps; ps.start_new_path(); ps.move_to(+ i, ); ps.line_to(, ); ps.line_to(, ); ps.end_poly(); agg::conv_stroke<agg::path_storage, agg::vcgen_markers_term> csps(ps); ras.add_path(csps); agg::render_scanlines_aa_solid(ras, sl, renb, agg::rgba8(, , )); /* agg::arrowhead ah; ah.head(0,10,5,5); ah.tail(10,10,5,5); // 用path_storage生成一条直线 agg::path_storage ps; ps.move_to(160,60); ps.line_to(100,100); // 转换 agg::conv_stroke<agg::path_storage, agg::vcgen_markers_term> csps(ps); agg::conv_marker<agg::vcgen_markers_term, agg::arrowhead> arrow(csps.markers(), ah); // 画线 ras.add_path(csps); agg::render_scanlines_aa_solid(ras,sl,renb,agg::rgba8(0,0,0)); // 画箭头 ras.add_path(arrow); agg::render_scanlines_aa_solid(ras,sl,renb,agg::rgba8(255,0,0)); agg::triangle t(100,100,50);//自定义顶点源 agg::conv_smooth_poly1_curve<agg::triangle> cspct(t); ras.add_path(cspct); agg::render_scanlines_aa_solid( ras,sl,renb,agg::rgba8(255,0,0)); for(int j=0; j<20; j++) pixf.blend_vline(50+j,20,100,agg::rgba(j/20.0,0,0),128); agg::int8u* p = rbuf.row_ptr(20);//得到第20行指针 memset(p,0,rbuf.stride_abs());//整行以0填充 */ } virtual void on_post_draw(void* raw_handler) override { } }; int agg_main(int argc, char* argv[]) { the_application app(agg::pix_format_bgr24, false); app.caption("AGG Example. Anti-Aliasing Demo"); , , agg::window_resize)) { return app.run(); } ; }

#include <stdlib.h> #include <stdio.h> #include <malloc.h> #define _USE_MATH_DEFINES #include <math.h> #include <gl/glut.h> #include <gl/glext.h> #include <cairo.h> ; ; ; ; double line_width = 5; //double line_width = 1 / win_width; cairo_surface_t * surf = NULL; cairo_t * cr = NULL; unsigned char * surf_data = NULL; GLuint texture_id; // Interface // void opengl_init(void) { printf("OpenGL version: %s\n", glGetString(GL_VERSION)); printf("OpenGL vendor: %s\n", glGetString(GL_VENDOR)); printf("OpenGL renderer: %s\n", glGetString(GL_RENDERER)); glClearColor(0.0f, 0.0f, 0.0f, 0.0f); glDisable(GL_DEPTH_TEST); glEnable(GL_BLEND); glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); glEnable(GL_TEXTURE_RECTANGLE_ARB); } void opengl_cleanup(void) { glDeleteTextures(, &texture_id); } void opengl_draw(int width, int height, unsigned char * surf_data) { if (!surf_data) { printf("draw_func() - No valid pointer to surface-data passed\n"); return; } glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glClear(GL_COLOR_BUFFER_BIT); glPushMatrix(); glBindTexture(GL_TEXTURE_RECTANGLE_ARB, texture_id); glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, , GL_RGBA, width, height, , GL_BGRA, GL_UNSIGNED_BYTE, surf_data); glColor3f(0.25f, 0.5f, 1.0f); glBegin(GL_QUADS); glTexCoord2f(0.0f, 0.0f); glVertex2f(0.0f, 0.0f); glTexCoord2f((GLfloat)width, 0.0f); glVertex2f(1.0f, 0.0f); glTexCoord2f((GLfloat)width, (GLfloat)height); glVertex2f(1.0f, 1.0f); glTexCoord2f(0.0f, (GLfloat)height); glVertex2f(0.0f, 1.0f); glEnd(); glPopMatrix(); } void opengl_resize(int width, int height) { glViewport(, , width, height); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(0.0f, 1.0f, 0.0f, 1.0f, -1.0f, 1.0f); glClear(GL_COLOR_BUFFER_BIT); glDeleteTextures(, &texture_id); glGenTextures(, &texture_id); glBindTexture(GL_TEXTURE_RECTANGLE_ARB, texture_id); glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, , GL_RGBA, width, height, , GL_BGRA, GL_UNSIGNED_BYTE, NULL); glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL); } void drawShape() { //save current brush cairo_save(cr); // clear background cairo_set_operator(cr, CAIRO_OPERATOR_OVER); //cairo_scale(cr, (double)win_height / 1.0f, (double)win_height / 1.0f); cairo_set_source_rgba(cr, , , , ); cairo_paint(cr); //set line color and style cairo_set_line_cap(cr, CAIRO_LINE_CAP_ROUND); cairo_set_line_width(cr, line_width); ; angle += 0.01f; //画矩形 cairo_set_source_rgba(cr, , , , ); //cairo_rectangle(cr, 0.5f + sinf(angle) * 0.1f, 0.5f, 0.1f, 0.1f); cairo_rectangle(cr, hw + sin(angle) * , hh, , ); cairo_fill(cr); cairo_stroke(cr); //画弧 cairo_set_source_rgba(cr, , , , ); cairo_arc(cr, , hh, , , * M_PI); //cairo_fill(cr); cairo_stroke(cr); //画线 ; ; ; ; ; x = r * cosf(angle); y = r * sinf(angle); cairo_set_source_rgba(cr, , , , ); cairo_move_to(cr, x + posx, y + posy); cairo_line_to(cr, -x + posx, -y + posy); cairo_stroke(cr); //restore previous brush cairo_restore(cr); } void display(void) { drawShape(); opengl_draw(win_width, win_height, surf_data); glutSwapBuffers(); } cairo_t* create_cairo_context(int width, int height, int channels, cairo_surface_t** surf, unsigned char** buffer) { cairo_t* cr; // create cairo-surface/context to act as OpenGL-texture source *buffer = (unsigned char*)calloc(channels * width * height, sizeof(unsigned char)); if (!*buffer) { printf("create_cairo_context() - Couldn't allocate buffer\n"); return NULL; } *surf = cairo_image_surface_create_for_data(*buffer, CAIRO_FORMAT_ARGB32, width, height, channels * width); if (cairo_surface_status(*surf) != CAIRO_STATUS_SUCCESS) { free(*buffer); printf("create_cairo_context() - Couldn't create surface\n"); return NULL; } cr = cairo_create(*surf); if (cairo_status(cr) != CAIRO_STATUS_SUCCESS) { free(*buffer); printf("create_cairo_context() - Couldn't create context\n"); return NULL; } return cr; } void cleanup(void) { opengl_cleanup(); free(surf_data); cairo_destroy(cr); exit(); } void keyboard(unsigned char key, int x, int y) { switch (key) { //27 is ESC key : case 'q': cleanup(); break; case 'd': cairo_surface_write_to_png(surf, "frame.png"); break; case '+': ) line_width += ; break; case '-': ) line_width -= ; break; } } void idle(void) { glutPostRedisplay(); } int main(int argc, char ** argv) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA); glutInitWindowSize(win_width, win_height); ) exit(-); // create cairo-surface/context to act as OpenGL-texture source cr = create_cairo_context(win_width, win_height, , &surf, &surf_data); // setup "GL-context" opengl_init(); glutDisplayFunc(display); glutKeyboardFunc(keyboard); glutIdleFunc(idle); opengl_resize(win_width, win_height); glutMainLoop(); ; }