Win7VS2015及MinGW环境编译矢量库agg2.5和cairo1.14.6

1 #include "agg_basics.h"
2 #include "agg_rendering_buffer.h"
3 #include "agg_rasterizer_scanline_aa.h"
4 #include "agg_scanline_u.h"
5 #include "agg_renderer_scanline.h"
6 #include "agg_pixfmt_rgb.h"
7 #include "platform/agg_platform_support.h"
8 #include "agg_ellipse.h"
9 #include "agg_conv_contour.h"
10 #include "agg_conv_stroke.h"
11
12 #include "agg_conv_marker.h"
13 #include "agg_arrowhead.h"
14 #include "agg_path_storage.h"
15 #include "agg_vcgen_markers_term.h"
16
17
18 #include // conv_stroke
19 #include // conv_dash
20 #include // conv_marker
21 #include // conv_curve
22 #include // conv_contour
23 #include // conv_smooth_poly1.h
24 #include // conv_bspline
25 #include // conv_transform
26
27
28 class the_application : public agg::platform_support
29 {
30 public:
31 the_application(agg::pix_format_e format, bool flip_y) :
32 agg::platform_support(format, flip_y)
33 {
34 }
35
36 virtual void on_draw()
37 {
38 //Rendering Buffer //用于存放像素点阵数据的内存块&＃xff0c;这里是最终形成的图像数据
39 agg::rendering_buffer &rbuf &＃61; rbuf_window();
40 agg::pixfmt_bgr24 pixf(rbuf);
41
42 // Renderers
43 typedef agg::renderer_base renderer_base_type; //底层渲染器
44 renderer_base_type renb(pixf);
45
46 // typedef agg::renderer_scanline_aa_solid renderer_scanline_type; //高层渲染器
47 typedef agg::renderer_scanline_bin_solid renderer_scanline_type; //高层渲染器
48
49 renderer_scanline_type rensl(renb);
50 /*
51 // Vertex Source
52 //agg::ellipse ell(100,100,50,50); //顶点源&＃xff0c;里面存放了一堆2D顶点以及对应的命令&＃xff0c;这个顶点源呈现的是一个圆形
53 agg::triangle ell(100,100,50);
54
55 // Coordinate conversion pipeline //坐标转换管道&＃xff0c;它可以变换Vertex Source中的顶点&＃xff0c;比如矩阵变换&＃xff0c;轮廓提取&＃xff0c;转换为虚线等。
56 //typedef agg::conv_contour ell_cc_type; //扩展轮廓线
57 typedef agg::conv_contour ell_cc_type;
58 ell_cc_type ccell(ell);
59
60 typedef agg::conv_stroke ell_cc_cs_type; //只显示轮廓线
61 ell_cc_cs_type csccell(ccell);
62 */
63
64 // Vertex Source
65
66 agg::ellipse ell(0, 0, 50, 50); // 圆心在中间
67 // Coordinate conversion pipeline
68 agg::trans_affine mtx; // trans_affine不 仅仅用于源顶点的变换&＃xff0c;在AGG库中有不少地方都能看到它
69 mtx.scale(0.5, 1); // x轴缩小到原来的一半
70 mtx.rotate(agg::deg2rad(30)); // 旋转30度
71 mtx.translate(100, 100); // 平移100,100
72 typedef agg::conv_transform ell_ct_type;
73 ell_ct_type ctell(ell, mtx); // 矩阵变换
74
75 typedef agg::conv_contour ell_cc_type;
76 ell_cc_type ccell(ctell); // 轮廓变换
77
78 typedef agg::conv_dash ell_cd_type;
79 ell_cd_type cdccell(ccell);
80 cdccell.add_dash(5, 5);
81
82
83 typedef agg::conv_stroke ell_cc_cs_type;
84 // ell_cc_cs_type csccell(ccell); // 转换成多义线
85 ell_cc_cs_type csccell(cdccell);
86
87 // csccell.width(3);
88
89
90 // Scanline Rasterizer //把顶点数据&＃xff08;矢量数据&＃xff09;转换成一组水平扫描线&＃xff0c;扫描线由一组线段(Span)组成&＃xff0c;线段(Span)包含了起始位置、长度和覆盖率&＃xff08;可以理解为透明度&＃xff09;信息。AGG的抗锯齿&＃xff08;Anti-Aliasing&＃xff09;功能也是在这时引入的。
91 agg::rasterizer_scanline_aa<> ras;
92 agg::scanline_u8 sl;
93
94 // Draw
95 renb.clear(agg::rgba8(255, 255, 255));
96 // renb.clip_box(30,30,160,160); // 设置可写区域
97
98 for (int i &＃61; 0; i<5; i&＃43;&＃43;)
99 {
100 ccell.width(i * 20);
101 ras.add_path(csccell);
102 rensl.color(agg::rgba8(0, 0, i * 50));
103 // agg::render_scanlines(ras,sl,rensl);
104 agg::render_scanlines_aa_solid(ras, sl, renb, agg::rgba8(0, 0, i * 50));
105
106 }
107
108
109 static double i &＃61; 0;
110 &＃43;&＃43;i;
111 agg::path_storage ps;
112
113 ps.start_new_path();
114 ps.move_to(200&＃43; i, 60);
115 ps.line_to(400, 100);
116 ps.line_to(300, 140);
117 ps.end_poly();
118
119
120
121 agg::conv_stroke csps(ps);
122 ras.add_path(csps);
123 agg::render_scanlines_aa_solid(ras, sl, renb, agg::rgba8(0, 0, 0));
124
125
126
127
128
129 /*
130 agg::arrowhead ah;
131 ah.head(0,10,5,5);
132 ah.tail(10,10,5,5);
133 // 用path_storage生成一条直线
134 agg::path_storage ps;
135 ps.move_to(160,60);
136 ps.line_to(100,100);
137 // 转换
138 agg::conv_stroke csps(ps);
139 agg::conv_marker
140 arrow(csps.markers(), ah);
141 // 画线
142 ras.add_path(csps);
143 agg::render_scanlines_aa_solid(ras,sl,renb,agg::rgba8(0,0,0));
144 // 画箭头
145 ras.add_path(arrow);
146 agg::render_scanlines_aa_solid(ras,sl,renb,agg::rgba8(255,0,0));
147
148
149 agg::triangle t(100,100,50);//自定义顶点源
150 agg::conv_smooth_poly1_curve cspct(t);
151 ras.add_path(cspct);
152 agg::render_scanlines_aa_solid(
153 ras,sl,renb,agg::rgba8(255,0,0));
154
155
156 for(int j&＃61;0; j<20; j&＃43;&＃43;)
157 pixf.blend_vline(50&＃43;j,20,100,agg::rgba(j/20.0,0,0),128);
158
159
160
161 agg::int8u* p &＃61; rbuf.row_ptr(20);//得到第20行指针
162 memset(p,0,rbuf.stride_abs());//整行以0填充
163 */
164 }
165
166 virtual void on_post_draw(void* raw_handler) override
167 {
168 }
169
170 };
171
172
173 int agg_main(int argc, char* argv[])
174 {
175
176
177 the_application app(agg::pix_format_bgr24, false);
178
179 app.caption("AGG Example. Anti-Aliasing Demo");
180
181 if (app.init(600, 400, agg::window_resize))
182 {
183 return app.run();
184 }
185 return -1;
186
187 }

1 #include
2 #include
3 #include <malloc.h>
4
5 #define _USE_MATH_DEFINES
6 #include
7
8 #include
9 #include
10
11 #include
12
13
14
15 double win_width &＃61; 800;
16 double win_height &＃61; 600;
17 double hw &＃61; win_width / 2;
18 double hh &＃61; win_height / 2;
19 double line_width &＃61; 5;
20 //double line_width &＃61; 1 / win_width;
21
22 cairo_surface_t * surf &＃61; NULL;
23 cairo_t * cr &＃61; NULL;
24 unsigned char * surf_data &＃61; NULL;
25
26 GLuint texture_id;
27
28 // Interface //
29
30 void opengl_init(void)
31 {
32 printf("OpenGL version: %s\n", glGetString(GL_VERSION));
33 printf("OpenGL vendor: %s\n", glGetString(GL_VENDOR));
34 printf("OpenGL renderer: %s\n", glGetString(GL_RENDERER));
35
36 glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
37 glDisable(GL_DEPTH_TEST);
38 glEnable(GL_BLEND);
39 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
40 glEnable(GL_TEXTURE_RECTANGLE_ARB);
41 }
42
43 void opengl_cleanup(void)
44 {
45 glDeleteTextures(1, &texture_id);
46 }
47
48 void opengl_draw(int width, int height, unsigned char * surf_data)
49 {
50 if (!surf_data)
51 {
52 printf("draw_func() - No valid pointer to surface-data passed\n");
53 return;
54 }
55
56 glMatrixMode(GL_MODELVIEW);
57 glLoadIdentity();
58 glClear(GL_COLOR_BUFFER_BIT);
59
60 glPushMatrix();
61
62 glBindTexture(GL_TEXTURE_RECTANGLE_ARB, texture_id);
63 glTexImage2D(GL_TEXTURE_RECTANGLE_ARB,
64 0,
65 GL_RGBA,
66 width,
67 height,
68 0,
69 GL_BGRA,
70 GL_UNSIGNED_BYTE,
71 surf_data);
72
73 glColor3f(0.25f, 0.5f, 1.0f);
74 glBegin(GL_QUADS);
75 glTexCoord2f(0.0f, 0.0f);
76 glVertex2f(0.0f, 0.0f);
77 glTexCoord2f((GLfloat)width, 0.0f);
78 glVertex2f(1.0f, 0.0f);
79 glTexCoord2f((GLfloat)width, (GLfloat)height);
80 glVertex2f(1.0f, 1.0f);
81 glTexCoord2f(0.0f, (GLfloat)height);
82 glVertex2f(0.0f, 1.0f);
83 glEnd();
84
85 glPopMatrix();
86 }
87
88 void opengl_resize(int width, int height)
89 {
90 glViewport(0, 0, width, height);
91 glMatrixMode(GL_PROJECTION);
92 glLoadIdentity();
93 glOrtho(0.0f, 1.0f, 0.0f, 1.0f, -1.0f, 1.0f);
94
95 glClear(GL_COLOR_BUFFER_BIT);
96
97 glDeleteTextures(1, &texture_id);
98 glGenTextures(1, &texture_id);
99 glBindTexture(GL_TEXTURE_RECTANGLE_ARB, texture_id);
100 glTexImage2D(GL_TEXTURE_RECTANGLE_ARB,
101 0,
102 GL_RGBA,
103 width,
104 height,
105 0,
106 GL_BGRA,
107 GL_UNSIGNED_BYTE,
108 NULL);
109 glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
110 }
111
112
113 void drawShape()
114 {
115 //save current brush
116 cairo_save(cr);
117
118 // clear background
119 cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
120 //cairo_scale(cr, (double)win_height / 1.0f, (double)win_height / 1.0f);
121 cairo_set_source_rgba(cr, 1, 1, 1, 1);
122 cairo_paint(cr);
123
124 //set line color and style
125 cairo_set_line_cap(cr, CAIRO_LINE_CAP_ROUND);
126 cairo_set_line_width(cr, line_width);
127
128
129
130 static double angle &＃61; 0;
131 angle &＃43;&＃61; 0.01f;
132
133 //画矩形
134 cairo_set_source_rgba(cr, 1, 0, 0, 1);
135 //cairo_rectangle(cr, 0.5f &＃43; sinf(angle) * 0.1f, 0.5f, 0.1f, 0.1f);
136 cairo_rectangle(cr, hw &＃43; sin(angle) * 100, hh, 100, 100);
137 cairo_fill(cr);
138 cairo_stroke(cr);
139
140 //画弧
141 cairo_set_source_rgba(cr, 0, 0, 1, 1);
142 cairo_arc(cr, 300, hh, 100, 0, 2 * M_PI);
143 //cairo_fill(cr);
144 cairo_stroke(cr);
145
146 //画线
147 static double r &＃61; 100;
148 static double posx &＃61; 500;
149 static double posy &＃61; 500;
150 static double x &＃61; 0;
151 static double y &＃61; 0;
152
153 x &＃61; r * cosf(angle);
154 y &＃61; r * sinf(angle);
155
156 cairo_set_source_rgba(cr, 0, 1, 0, 1);
157 cairo_move_to(cr, x &＃43; posx, y &＃43; posy);
158 cairo_line_to(cr, -x &＃43; posx, -y &＃43; posy);
159 cairo_stroke(cr);
160
161
162
163 //restore previous brush
164 cairo_restore(cr);
165 }
166
167
168 void display(void)
169 {
170 drawShape();
171
172 opengl_draw(win_width, win_height, surf_data);
173
174 glutSwapBuffers();
175 }
176
177 cairo_t*
178 create_cairo_context(int width,
179 int height,
180 int channels,
181 cairo_surface_t** surf,
182 unsigned char** buffer)
183 {
184 cairo_t* cr;
185
186 // create cairo-surface/context to act as OpenGL-texture source
187 *buffer &＃61; (unsigned char*)calloc(channels * width * height, sizeof(unsigned char));
188 if (!*buffer)
189 {
190 printf("create_cairo_context() - Couldn&＃39;t allocate buffer\n");
191 return NULL;
192 }
193
194 *surf &＃61; cairo_image_surface_create_for_data(*buffer,
195 CAIRO_FORMAT_ARGB32,
196 width,
197 height,
198 channels * width);
199 if (cairo_surface_status(*surf) !&＃61; CAIRO_STATUS_SUCCESS)
200 {
201 free(*buffer);
202 printf("create_cairo_context() - Couldn&＃39;t create surface\n");
203 return NULL;
204 }
205
206 cr &＃61; cairo_create(*surf);
207 if (cairo_status(cr) !&＃61; CAIRO_STATUS_SUCCESS)
208 {
209 free(*buffer);
210 printf("create_cairo_context() - Couldn&＃39;t create context\n");
211 return NULL;
212 }
213
214 return cr;
215 }
216
217 void cleanup(void)
218 {
219 opengl_cleanup();
220 free(surf_data);
221 cairo_destroy(cr);
222 exit(0);
223 }
224
225 void keyboard(unsigned char key, int x, int y)
226 {
227 switch (key)
228 {
229 //27 is ESC key
230 case 27:
231 case &＃39;q&＃39;:
232 cleanup();
233 break;
234
235 case &＃39;d&＃39;:
236 cairo_surface_write_to_png(surf, "frame.png");
237 break;
238
239 case &＃39;&＃43;&＃39;:
240 if (line_width <10)
241 line_width &＃43;&＃61; 1;
242 break;
243
244 case &＃39;-&＃39;:
245 if (line_width > 1)
246 line_width -&＃61; 1;
247 break;
248
249 }
250 }
251
252 void idle(void)
253 {
254 glutPostRedisplay();
255 }
256
257 int main(int argc, char ** argv)
258 {
259 glutInit(&argc, argv);
260 glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA);
261 glutInitWindowSize(win_width, win_height);
262
263 if (glutCreateWindow("Opengl Test") &＃61;&＃61; 0)
264 exit(-2);
265
266 // create cairo-surface/context to act as OpenGL-texture source
267 cr &＃61; create_cairo_context(win_width, win_height, 4, &surf, &surf_data);
268
269 // setup "GL-context"
270 opengl_init();
271
272 glutDisplayFunc(display);
273 glutKeyboardFunc(keyboard);
274 glutIdleFunc(idle);
275 opengl_resize(win_width, win_height);
276
277 glutMainLoop();
278
279 return 0;
280 }