 Timestamp:
 May 30, 2009, 6:01:17 PM (11 years ago)
 File:

 1 edited
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libpipi/trunk/examples/img2twit.cpp
r3537 r3538 72 72 #define RANGE_V 10 73 73 74 /* How does the algorithm work: one point per cell, or two? XXX: changing75 * this value breaks compatibility with other images. */76 #define POINTS_PER_CELL 277 78 74 /* Start with a random image (1), or with a good estimate (0)? */ 79 75 #define RANDOM_START 0 … … 91 87 /* Iterations per point  larger means slower but nicer */ 92 88 static int ITERATIONS_PER_POINT = 50; 89 90 /* Points per cell  1 allows to put more cells, but 2 gives better results */ 91 static int POINTS_PER_CELL = 2; 93 92 94 93 /* The range value for point parameters: X Y, red/green/blue, "strength" … … 154 153 HEADER_BITS = logf(RANGE_W * RANGE_H * RANGE_V) / logf(2); 155 154 DATA_BITS = TOTAL_BITS  HEADER_BITS; 156 #if POINTS_PER_CELL == 2 157 CELL_BITS = (2 * logf(RANGE_SBGR) + logf(RANGE_XY2)) / logf(2); 158 //CELL_BITS = 2 * logf(RANGE_SBGRXY) / logf(2); 159 #else 160 CELL_BITS = logf(RANGE_SBGRXY) / logf(2); 161 #endif 155 if(version == 0) 156 { 157 POINTS_PER_CELL = 1; 158 CELL_BITS = logf(RANGE_SBGRXY) / logf(2); 159 } 160 else if(version == 1) 161 { 162 POINTS_PER_CELL = 2; 163 CELL_BITS = (2 * logf(RANGE_SBGR) + logf(RANGE_XY2)) / logf(2); 164 } 162 165 TOTAL_CELLS = (int)(DATA_BITS / CELL_BITS); 163 166 MAX_ITERATIONS = ITERATIONS_PER_POINT * POINTS_PER_CELL * TOTAL_CELLS; … … 840 843 841 844 #if RANDOM_START == 1 842 # if POINTS_PER_CELL == 2 843 add_random_point(); 844 # endif 845 add_random_point(); 845 for(int i = 0; i < POINTS_PER_CELL; i++) 846 add_random_point(); 846 847 #else 847 848 /* 0.80 and 0.20 were chosen empirically, it gives a 10% better 848 849 * initial distance. Definitely worth it. */ 849 # if POINTS_PER_CELL == 1 850 if(total < min + (max  min) / 2) 851 { 852 # endif 853 add_point(xmin, ymin, 854 data[4 * (xmin + ymin * p>w) + 0] * 0.80 + mr * 0.20, 855 data[4 * (xmin + ymin * p>w) + 1] * 0.80 + mg * 0.20, 856 data[4 * (xmin + ymin * p>w) + 2] * 0.80 + mb * 0.20, 857 wmin); 858 # if POINTS_PER_CELL == 1 859 } 860 else 861 { 862 # endif 863 add_point(xmax, ymax, 864 data[4 * (xmax + ymax * p>w) + 0] * 0.80 + mr * 0.20, 865 data[4 * (xmax + ymax * p>w) + 1] * 0.80 + mg * 0.20, 866 data[4 * (xmax + ymax * p>w) + 2] * 0.80 + mb * 0.20, 867 wmax); 868 # if POINTS_PER_CELL == 1 869 } 870 # endif 850 if(POINTS_PER_CELL == 2  total < min + (max  min) / 2) 851 add_point(xmin, ymin, 852 data[4 * (xmin + ymin * p>w) + 0] * 0.80 + mr * 0.20, 853 data[4 * (xmin + ymin * p>w) + 1] * 0.80 + mg * 0.20, 854 data[4 * (xmin + ymin * p>w) + 2] * 0.80 + mb * 0.20, 855 wmin); 856 857 if(POINTS_PER_CELL == 2  total >= min + (max  min) / 2) 858 add_point(xmax, ymax, 859 data[4 * (xmax + ymax * p>w) + 0] * 0.80 + mr * 0.20, 860 data[4 * (xmax + ymax * p>w) + 1] * 0.80 + mg * 0.20, 861 data[4 * (xmax + ymax * p>w) + 2] * 0.80 + mb * 0.20, 862 wmax); 871 863 #endif 872 864 } … … 1053 1045 version = b.pop(RANGE_V); 1054 1046 1047 if(version > 1) 1048 { 1049 fprintf(stderr, "Error: unsupported algorithm version %i\n", 1050 version); 1051 return EXIT_FAILURE; 1052 } 1053 1055 1054 /* Read width and height from bitstream */ 1056 1055 width = b.pop(RANGE_W) + 1; … … 1078 1077 fprintf(stderr, "Error: image size %ix%i is out of bounds\n", 1079 1078 width, height); 1080 return EXIT_FAILURE;1081 }1082 1083 if(version > 1)1084 {1085 fprintf(stderr, "Error: unsupported algorithm version %i\n", version);1086 1079 return EXIT_FAILURE; 1087 1080 } … … 1148 1141 { 1149 1142 /* Resize and filter image to better state */ 1150 tmp = pipi_gaussian_blur(src, 0. 5 * dw * RANGE_X / width);1143 tmp = pipi_gaussian_blur(src, 0.25 * dw * RANGE_X / width); 1151 1144 pipi_free(src); 1152 1145 src = pipi_resize(tmp, dw * RANGE_X, dh * RANGE_Y); … … 1203 1196 apply_op(op1, &points[pt]); 1204 1197 1205 #if POINTS_PER_CELL == 21206 1198 /* Check that two points don't fall at the same place */ 1207 while(points[pt].x == points[pt ^ 1].x 1208 && points[pt].y == points[pt ^ 1].y) 1209 { 1210 points[pt] = oldpt; 1211 op1 = rand_op(); 1212 apply_op(op1, &points[pt]); 1213 } 1214 #endif 1199 if(POINTS_PER_CELL == 2) 1200 { 1201 while(points[pt].x == points[pt ^ 1].x 1202 && points[pt].y == points[pt ^ 1].y) 1203 { 1204 points[pt] = oldpt; 1205 op1 = rand_op(); 1206 apply_op(op1, &points[pt]); 1207 } 1208 } 1215 1209 1216 1210 render(scrap, zonex * RANGE_X, zoney * RANGE_Y, … … 1281 1275 fprintf(stderr, "\r \r"); 1282 1276 1283 #if 11277 #if 0 1284 1278 dst = pipi_resize(tmp, width, height); 1285 1279 pipi_free(tmp); … … 1293 1287 for(int i = 0; i < npoints; i += POINTS_PER_CELL) 1294 1288 { 1295 #if POINTS_PER_CELL == 2 1296 int x1, y1, x2, y2; 1297 x1 = points[i].x; 1298 y1 = points[i].y; 1299 x2 = points[i + 1].x; 1300 y2 = points[i + 1].y; 1301 1302 bool swap; 1303 uint32_t pack = pack_coords(x1, y1, x2, y2, &swap); 1304 1305 b.push(points[i + (swap ? 1 : 0)].s, RANGE_S); 1306 b.push(points[i + (swap ? 1 : 0)].b, RANGE_B); 1307 b.push(points[i + (swap ? 1 : 0)].g, RANGE_G); 1308 b.push(points[i + (swap ? 1 : 0)].r, RANGE_R); 1309 b.push(points[i + (swap ? 0 : 1)].s, RANGE_S); 1310 b.push(points[i + (swap ? 0 : 1)].b, RANGE_B); 1311 b.push(points[i + (swap ? 0 : 1)].g, RANGE_G); 1312 b.push(points[i + (swap ? 0 : 1)].r, RANGE_R); 1313 b.push(pack, RANGE_XY2); 1314 #else 1315 b.push(points[i].s, RANGE_S); 1316 b.push(points[i].b, RANGE_B); 1317 b.push(points[i].g, RANGE_G); 1318 b.push(points[i].r, RANGE_R); 1319 b.push(points[i].x, RANGE_X); 1320 b.push(points[i].y, RANGE_Y); 1321 #endif 1289 if(POINTS_PER_CELL == 2) 1290 { 1291 int x1, y1, x2, y2; 1292 x1 = points[i].x; 1293 y1 = points[i].y; 1294 x2 = points[i + 1].x; 1295 y2 = points[i + 1].y; 1296 1297 bool swap; 1298 uint32_t pack = pack_coords(x1, y1, x2, y2, &swap); 1299 1300 b.push(points[i + (swap ? 1 : 0)].s, RANGE_S); 1301 b.push(points[i + (swap ? 1 : 0)].b, RANGE_B); 1302 b.push(points[i + (swap ? 1 : 0)].g, RANGE_G); 1303 b.push(points[i + (swap ? 1 : 0)].r, RANGE_R); 1304 b.push(points[i + (swap ? 0 : 1)].s, RANGE_S); 1305 b.push(points[i + (swap ? 0 : 1)].b, RANGE_B); 1306 b.push(points[i + (swap ? 0 : 1)].g, RANGE_G); 1307 b.push(points[i + (swap ? 0 : 1)].r, RANGE_R); 1308 b.push(pack, RANGE_XY2); 1309 } 1310 else 1311 { 1312 b.push(points[i].s, RANGE_S); 1313 b.push(points[i].b, RANGE_B); 1314 b.push(points[i].g, RANGE_G); 1315 b.push(points[i].r, RANGE_R); 1316 b.push(points[i].x, RANGE_X); 1317 b.push(points[i].y, RANGE_Y); 1318 } 1322 1319 } 1323 1320 b.push(height  1, RANGE_H); … … 1335 1332 for(int i = dw * dh; i; ) 1336 1333 { 1337 #if POINTS_PER_CELL == 2 1338 uint32_t pack = b.pop(RANGE_XY2); 1339 int x1, y1, x2, y2; 1340 unpack_coords(pack, &x1, &y1, &x2, &y2); 1341 1342 points[i * 2 + 1].y = y2; 1343 points[i * 2 + 1].x = x2; 1344 points[i * 2 + 1].r = b.pop(RANGE_R); 1345 points[i * 2 + 1].g = b.pop(RANGE_G); 1346 points[i * 2 + 1].b = b.pop(RANGE_B); 1347 points[i * 2 + 1].s = b.pop(RANGE_S); 1348 points[i * 2].y = y1; 1349 points[i * 2].x = x1; 1350 points[i * 2].r = b.pop(RANGE_R); 1351 points[i * 2].g = b.pop(RANGE_G); 1352 points[i * 2].b = b.pop(RANGE_B); 1353 points[i * 2].s = b.pop(RANGE_S); 1354 #else 1355 points[i].y = b.pop(RANGE_Y); 1356 points[i].x = b.pop(RANGE_X); 1357 points[i].r = b.pop(RANGE_R); 1358 points[i].g = b.pop(RANGE_G); 1359 points[i].b = b.pop(RANGE_B); 1360 points[i].s = b.pop(RANGE_S); 1361 #endif 1334 if(POINTS_PER_CELL == 2) 1335 { 1336 uint32_t pack = b.pop(RANGE_XY2); 1337 int x1, y1, x2, y2; 1338 unpack_coords(pack, &x1, &y1, &x2, &y2); 1339 1340 points[i * 2 + 1].y = y2; 1341 points[i * 2 + 1].x = x2; 1342 points[i * 2 + 1].r = b.pop(RANGE_R); 1343 points[i * 2 + 1].g = b.pop(RANGE_G); 1344 points[i * 2 + 1].b = b.pop(RANGE_B); 1345 points[i * 2 + 1].s = b.pop(RANGE_S); 1346 points[i * 2].y = y1; 1347 points[i * 2].x = x1; 1348 points[i * 2].r = b.pop(RANGE_R); 1349 points[i * 2].g = b.pop(RANGE_G); 1350 points[i * 2].b = b.pop(RANGE_B); 1351 points[i * 2].s = b.pop(RANGE_S); 1352 } 1353 else 1354 { 1355 points[i].y = b.pop(RANGE_Y); 1356 points[i].x = b.pop(RANGE_X); 1357 points[i].r = b.pop(RANGE_R); 1358 points[i].g = b.pop(RANGE_G); 1359 points[i].b = b.pop(RANGE_B); 1360 points[i].s = b.pop(RANGE_S); 1361 } 1362 1362 } 1363 1363 npoints = dw * dh * POINTS_PER_CELL;
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