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画布分割算法

使用递归函数，实现在添加方形画布时，自动过滤画布重叠区域
  1 #define LCM_BUF_SIZE (85*1024)
  2 
  3 typedef struct _draw_img
  4 {
  5     int16_t  x0;
  6     int16_t  y0;
  7     int16_t  x1;
  8     int16_t  y1;
  9     uint16_t len;
 10 } draw_img_t;
 11 
 12 uint8_t lcm_buf[LCM_BUF_SIZE] = { 0x00 };
 13 
 14 static void canvas_regist(uint16_t x, uint16_t y, uint16_t w, uint16_t h)
 15 {
 16     uint8_t *lcd_buff = lcm_buf;
 17 
 18     uint32_t readSize = (uint32_t)(w * h);
 19 
 20     ASSERT ( gimgNext != NULL && (gimgNext >= lcd_buff) && (gimgNext <= (lcd_buff + LCM_BUF_SIZE - readSize - sizeof(draw_img_t))));
 21     if(gimgNext > (lcd_buff + LCM_BUF_SIZE - readSize))
 22     {
 23         NRF_LOG_ERROR("lcm buf overflow!!!");
 24         NRF_LOG_ERROR("lcm buf need size = %d.%dk", (uint32_t)((gimgNext+readSize)-lcd_buff)/1000,
 25         (uint32_t)((gimgNext+readSize)-lcd_buff)%1000);
 26         return;
 27     }
 28     draw_img_t *p = (draw_img_t *)gimgNext;
 29 
 30     p->x0 = x;
 31     p->y0 = y;
 32     p->x1 = x + w - 1;
 33     p->y1 = y + h - 1;
 34     p->len =readSize + sizeof(draw_img_t);
 35 
 36     gimgCount++;
 37     lcd_buff[0] = gimgCount;
 38     gimgNext += p->len;
 39 
 40     return;
 41 }
 42 void add_new_canvas(uint16_t x, uint16_t y, uint16_t w, uint16_t h)
 43 {
 44     if((w <= 1) || (h <= 1))
 45     {
 46         return;
 47     }
 48     
 49     uint8_t *lcd_buff = lcm_buf;
 50     draw_img_t *p_img = NULL;
 51     uint32_t index = 2;
 52     draw_img_t new_canvas;
 53     new_canvas.x0 = x;
 54     new_canvas.y0 = y;
 55     new_canvas.x1 = x + w - 1;
 56     new_canvas.y1 = y + h - 1;
 57     int i = 0;
 58 
 59     if(gimgCount == 0)
 60     {
 61         canvas_regist(x, y, w, h);
 62         return;
 63     }
 64     for(i = 0; i < gimgCount; i++)
 65     {
 66         p_img = (draw_img_t *)&lcd_buff[index];
 67         if(((p_img->x1-p_img->x0+1)==LCD_WIDTH) && ((p_img->y1-p_img->y0+1)==LCD_HEIGHT))
 68         {
 69             index += p_img->len;
 70             continue;
 71         }
 72         /*    *******************
 73               *                 *
 74               *  *************  *
 75               *  *           *  *
 76               *  *           *  *
 77               *  *           *  *
 78               *  *           *  *
 79               *  *************  *
 80               *                 *
 81               *******************           */
 82         else if((p_img->x0 <= new_canvas.x0) && (p_img->x1 >= new_canvas.x1) && (p_img->y0 <= new_canvas.y0) && (p_img->y1 >= new_canvas.y1))
 83         {
 84             //NRF_LOG_ERROR("canvas existed");
 85             return;
 86         }
 87         /*    *******************
 88               *                 *
 89               *  *************  *
 90               *  *           *  *
 91               *  *           *  *
 92               *  *           *  *
 93               *  *           *  *
 94               *  *************  *
 95               *                 *
 96               *******************           */
 97         else if((p_img->x0 >= new_canvas.x0) && (p_img->x1 <= new_canvas.x1) && (p_img->y0 >= new_canvas.y0) && (p_img->y1 <= new_canvas.y1))
 98         {
 99             add_new_canvas(new_canvas.x0, new_canvas.y0, w, p_img->y0-new_canvas.y0+1);
100             add_new_canvas(new_canvas.x0, p_img->y1, w, new_canvas.y1-p_img->y1+1);
101             add_new_canvas(new_canvas.x0, p_img->y0, p_img->x0-new_canvas.x0+1, p_img->y1-p_img->y0+1);
102             add_new_canvas(p_img->x1, p_img->y0, new_canvas.x1-p_img->x1+1, p_img->y1-p_img->y0+1);
103             return;
104         }
105         /*  *********
106             *       *
107             *   *************
108             *   *   *       *
109             *********       *
110                 *           *
111                 *           *
112                 *************        */
113         else if((p_img->x0 > new_canvas.x0) && (p_img->x0 < new_canvas.x1) && (p_img->y0 > new_canvas.y0) && (p_img->y0 < new_canvas.y1))
114         {
115             add_new_canvas(new_canvas.x0, new_canvas.y0, w, p_img->y0-new_canvas.y0+1);
116             add_new_canvas(new_canvas.x0, p_img->y0, p_img->x0-new_canvas.x0+1, new_canvas.y1-p_img->y0+1);
117             if(p_img->x1 < new_canvas.x1)
118             {
119                 add_new_canvas(p_img->x1, p_img->y0, new_canvas.x1-p_img->x1+1, new_canvas.y1-p_img->y0+1);
120             }
121             return;
122         }
123         /*                *********
124                           *       *
125                  *************    *
126                  *        *  *    *
127                  *        *********
128                  *           *
129                  *           *
130                  *************        */
131         else if((p_img->x1 > new_canvas.x0) && (p_img->x1 < new_canvas.x1) && (p_img->y0 > new_canvas.y0) && (p_img->y0 < new_canvas.y1))
132         {
133             add_new_canvas(new_canvas.x0, new_canvas.y0, w, p_img->y0-new_canvas.y0+1);
134             add_new_canvas(p_img->x1, p_img->y0, new_canvas.x1-p_img->x1+1, new_canvas.y1-p_img->y0+1);
135             if(p_img->y1 < new_canvas.y1)
136             {
137                 add_new_canvas(new_canvas.x0, p_img->y1, p_img->x1-new_canvas.x0+1, new_canvas.y1-p_img->y1+1);
138             }
139             return;
140         }
141         /*       *************
142                  *           *
143                  *           *
144              *********       *
145              *   *   *       *
146              *   *************
147              *       *
148              *********                */
149         else if((p_img->x0 > new_canvas.x0) && (p_img->x0 < new_canvas.x1) && (p_img->y1 > new_canvas.y0) && (p_img->y1 < new_canvas.y1))
150         {
151             add_new_canvas(new_canvas.x0, new_canvas.y0, p_img->x0-new_canvas.x0+1, p_img->y1-new_canvas.y0+1);
152             add_new_canvas(new_canvas.x0, p_img->y1, w, new_canvas.y1-p_img->y1+1);
153             if(p_img->y0 > new_canvas.y0)
154             {
155                 add_new_canvas(p_img->x0,new_canvas.y0,  new_canvas.x1-p_img->x0+1, p_img->y0-new_canvas.y0+1);
156             }
157             return;
158         }
159         /*       *************
160                  *           *
161                  *           *
162                  *        *********
163                  *        *  *    *
164                  *************    *
165                           *       *
166                           *********   */
167         else if((p_img->x1 > new_canvas.x0) && (p_img->x1 < new_canvas.x1) && (p_img->y1 > new_canvas.y0) && (p_img->y1 < new_canvas.y1))
168         {
169             add_new_canvas(p_img->x1, new_canvas.y0, new_canvas.x1-p_img->x1+1, p_img->y1-new_canvas.y0+1);
170             add_new_canvas(new_canvas.x0, p_img->y1, w, new_canvas.y1-p_img->y1+1);
171             if(p_img->x0 > new_canvas.x0)
172             {
173                 add_new_canvas(new_canvas.x0, new_canvas.y0, p_img->x0-new_canvas.x0+1, p_img->y1-new_canvas.y0+1);
174             }
175             return;
176         }
177         /*       *************
178             *********        *
179             *    *  *        *
180             *    *  *        *
181             *********        *
182                  *************        */
183         else if((p_img->x0 > new_canvas.x0) && (p_img->x0 < new_canvas.x1) && (p_img->y0 <= new_canvas.y0) && (p_img->y1 >= new_canvas.y1) && (p_img->x1 >= new_canvas.x1))
184         {
185             add_new_canvas(new_canvas.x0, new_canvas.y0, p_img->x0-new_canvas.x0+1, h);
186             return;
187         }
188          /*       *************
189                   *       *********
190                   *       *   *   *
191                   *       *   *   *
192                   *       *********
193                   *************        */
194         else if((p_img->x1 > new_canvas.x0) && (p_img->x1 < new_canvas.x1) && (p_img->y0 <= new_canvas.y0) && (p_img->y1 >= new_canvas.y1) && (p_img->x0 <= new_canvas.x0))
195         {
196             add_new_canvas(p_img->x1, new_canvas.y0, new_canvas.x1-p_img->x1+1, h);
197             return;
198         }
199          /*         *******
200                     *     *
201                  *************
202                  *  *     *  *
203                  *  *******  *
204                  *           *
205                  *           *
206                  *************        */
207         else if((p_img->x0 <= new_canvas.x0) && (p_img->x1 >= new_canvas.x1) && (p_img->y0 > new_canvas.y0) && (p_img->y0 < new_canvas.y1) && (p_img->y1 >= new_canvas.y1))
208         {
209             add_new_canvas(new_canvas.x0, new_canvas.y0, w, p_img->y0-new_canvas.y0+1);
210             return;
211         }
212          /*      *************
213                  *           *
214                  *           *
215                  *  *******  *
216                  *  *     *  *
217                  *************
218                     *     *
219                     *******           */
220         else if((p_img->x0 <= new_canvas.x0) && (p_img->x1 >= new_canvas.x1) && (p_img->y1 > new_canvas.y0) && (p_img->y1 < new_canvas.y1) && (p_img->y0 <= new_canvas.y0))
221         {
222             add_new_canvas(new_canvas.x0, p_img->y1, w, new_canvas.y1-p_img->y1+1);
223             return;
224         }
225         /*       *************
226               *******************
227               *  *           *  *
228               *  *           *  *
229               *******************
230                  *************        */
231         else if((p_img->x0 > new_canvas.x0) && (p_img->x1 < new_canvas.x1) && (p_img->y0 <= new_canvas.y0) && (p_img->y1 >= new_canvas.y1))
232         {
233             add_new_canvas(new_canvas.x0, new_canvas.y0, p_img->x0-new_canvas.x0+1, h);
234             add_new_canvas(p_img->x1, new_canvas.y0, new_canvas.x1-p_img->x1+1, h);
235             return;
236         }
237         /*          *******
238                     *     *
239                  *************
240                  *  *     *  *
241                  *  *     *  *
242                  *  *     *  *
243                  *  *     *  *
244                  *************
245                     *     *
246                     *******           */
247         else if((p_img->x0 <= new_canvas.x0) && (p_img->x1 >= new_canvas.x1) && (p_img->y0 > new_canvas.y0) && (p_img->y1 < new_canvas.y1))
248         {
249             add_new_canvas(new_canvas.x0, new_canvas.y0, w, p_img->y0-new_canvas.y0+1);
250             add_new_canvas(new_canvas.x0, p_img->y1, w, new_canvas.y1-p_img->y1+1);
251             return;
252         }
253         index += p_img->len;
254     }
255     canvas_regist(x, y, w, h);
256 
257     return;
258 }
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原文地址：https://www.cnblogs.com/qingyunboke/p/14048691.html