wonderbrush/support/blending.h

37 blend_gamma(uint16 b1, uint16 b2, uint16 b3, uint8 ba,	// bottom components
61 blend(uint8 b1, uint8 b2, uint8 b3, uint8 ba,		// bottom components
88 blend_colors_copy(uint8* bottom, uint8 alpha, uint8* dest,
93 		if (bottom[3] == 0 || alpha == 255) {
99 			// only bottom components need to be gamma corrected
100 			uint16 gb1 = kGammaTable[bottom[0]];
101 			uint16 gb2 = kGammaTable[bottom[1]];
102 			uint16 gb3 = kGammaTable[bottom[2]];
104 			blend_gamma(gb1, gb2, gb3, bottom[3],
109 		*((uint32*)dest) = *((uint32*)bottom);
115 blend_colors(uint8* bottom, uint8 alpha,
120 		if (bottom[3] == 0 || alpha == 255) {
121 			bottom[0] = c1;
122 			bottom[1] = c2;
123 			bottom[2] = c3;
124 			bottom[3] = alpha;
126 			// only bottom components need to be gamma corrected
127 			uint16 gb1 = kGammaTable[bottom[0]];
128 			uint16 gb2 = kGammaTable[bottom[1]];
129 			uint16 gb3 = kGammaTable[bottom[2]];
131 			blend_gamma(gb1, gb2, gb3, bottom[3],
133 						&bottom[0], &bottom[1], &bottom[2], &bottom[3]);
140 blend_colors_copy(uint8* bottom, uint8 alpha, uint8* dest,
144 		if (bottom[3] == 0 || alpha == 255) {
150 			blend(bottom[0], bottom[1], bottom[2], bottom[3],
155 		*((uint32*)dest) = *((uint32*)bottom);
161 blend_colors(uint8* bottom, uint8 alpha, uint8 c1, uint8 c2, uint8 c3)
164 		if (bottom[3] == 0 || alpha == 255) {
165 			bottom[0] = c1;
166 			bottom[1] = c2;
167 			bottom[2] = c3;
168 			bottom[3] = alpha;
170 			blend(bottom[0], bottom[1], bottom[2], bottom[3],
172 				  &bottom[0], &bottom[1], &bottom[2], &bottom[3]);
179 blend_colors(uint8* bottom, uint8* source, uint8 alphaOverride)
183 		if (bottom[3] == 0 || alpha == 255) {
184 			bottom[0] = source[0];
185 			bottom[1] = source[1];
186 			bottom[2] = source[2];
187 			bottom[3] = alpha;
189 			blend(bottom[0], bottom[1], bottom[2], bottom[3],
191 				  &bottom[0], &bottom[1], &bottom[2], &bottom[3]);
198 blend_colors(uint8* bottom, uint8* source)
201 		if (bottom[3] == 0 || source[3] == 255) {
202 			bottom[0] = source[0];
203 			bottom[1] = source[1];
204 			bottom[2] = source[2];
205 			bottom[3] = source[3];
207 			blend(bottom[0], bottom[1], bottom[2], bottom[3],
209 				  &bottom[0], &bottom[1], &bottom[2], &bottom[3]);
216 blend_colors_copy(uint8* dest, uint8* bottom, uint8* top)
218 	if (bottom[3] == 0 || top[3] == 255) {
224 			blend(bottom[0], bottom[1], bottom[2], bottom[3],
232 blend_pixels(uint8* bottom, uint8* top, uint8 alpha)
236 			bottom[0] = top[0];
237 			bottom[1] = top[1];
238 			bottom[2] = top[2];
239 			bottom[3] = top[3];
245 			uint16 b1 = kGammaTable[bottom[0]];
246 			uint16 b2 = kGammaTable[bottom[1]];
247 			uint16 b3 = kGammaTable[bottom[2]];
249 			uint8 mergeAlpha = bottom[3] ? (top[3] * alpha) / 255 : 255;
251 			bottom[0] = kInverseGammaTable[(b1 * invAlpha + t1 * mergeAlpha) / 255];
252 			bottom[1] = kInverseGammaTable[(b2 * invAlpha + t2 * mergeAlpha) / 255];
253 			bottom[2] = kInverseGammaTable[(b3 * invAlpha + t3 * mergeAlpha) / 255];
254 			bottom[3] = (bottom[3] * (255 - alpha) + top[3] * alpha) / 255;
261 blend_pixels_copy(uint8* bottom, uint8* top, uint8* dest, uint8 alpha)
274 			uint16 b1 = kGammaTable[bottom[0]];
275 			uint16 b2 = kGammaTable[bottom[1]];
276 			uint16 b3 = kGammaTable[bottom[2]];
278 			uint8 mergeAlpha = bottom[3] ? (top[3] * alpha) / 255 : 255;
283 			dest[3] = (bottom[3] * (255 - alpha) + top[3] * alpha) / 255;
286 		dest[0] = bottom[0];
287 		dest[1] = bottom[1];
288 		dest[2] = bottom[2];
289 		dest[3] = bottom[3];
295 blend_pixels_overlay(uint8* bottom, uint8* top, uint8 alphaOverride)
300 			bottom[0] = top[0];
301 			bottom[1] = top[1];
302 			bottom[2] = top[2];
303 			bottom[3] = top[3];
309 			uint16 b1 = kGammaTable[bottom[0]];
310 			uint16 b2 = kGammaTable[bottom[1]];
311 			uint16 b3 = kGammaTable[bottom[2]];
313 			uint8 mergeAlpha = bottom[3] ? alpha : 255;
315 			bottom[0] = kInverseGammaTable[(b1 * invAlpha + t1 * mergeAlpha) / 255];
316 			bottom[1] = kInverseGammaTable[(b2 * invAlpha + t2 * mergeAlpha) / 255];
317 			bottom[2] = kInverseGammaTable[(b3 * invAlpha + t3 * mergeAlpha) / 255];
318 			bottom[3] = (bottom[3] * (255 - alpha) + top[3] * alpha) / 255;
325 blend_pixels_overlay_copy(uint8* bottom, uint8* top, uint8* dest, uint8 alphaOverride)
339 			uint16 b1 = kGammaTable[bottom[0]];
340 			uint16 b2 = kGammaTable[bottom[1]];
341 			uint16 b3 = kGammaTable[bottom[2]];
343 			uint8 mergeAlpha = bottom[3] ? alpha : 255;
348 			dest[3] = (bottom[3] * (255 - alpha) + top[3] * alpha) / 255;
351 		dest[0] = bottom[0];
352 		dest[1] = bottom[1];
353 		dest[2] = bottom[2];
354 		dest[3] = bottom[3];
363 blend_colors_copy(uint8* bottom, uint8 alpha, uint8* dest,
367 		if (bottom[3] == 0 || alpha == 255) {
373 			if (bottom[3] == 255) {
375 				dest[0] = (uint8)((bottom[0] * destAlpha + c1 * alpha) / 255);
376 				dest[1] = (uint8)((bottom[1] * destAlpha + c2 * alpha) / 255);
377 				dest[2] = (uint8)((bottom[2] * destAlpha + c3 * alpha) / 255);
381 				uint32 alphaTemp = (65025 - alphaRest * (255 - bottom[3]));
382 				uint32 alphaDest = bottom[3] * alphaRest;
384 				dest[0] = (bottom[0] * alphaDest + c1 * alphaSrc) / alphaTemp;
385 				dest[1] = (bottom[1] * alphaDest + c2 * alphaSrc) / alphaTemp;
386 				dest[2] = (bottom[2] * alphaDest + c3 * alphaSrc) / alphaTemp;
391 		*((uint32*)dest) = *((uint32*)bottom);
397 blend_colors(uint8* bottom, uint8 alpha, uint8 c1, uint8 c2, uint8 c3)
400 		if (bottom[3] == 0 || alpha == 255) {
401 			bottom[0] = c1;
402 			bottom[1] = c2;
403 			bottom[2] = c3;
404 			bottom[3] = alpha;
406 			if (bottom[3] == 255) {
408 				bottom[0] = (uint8)((bottom[0] * destAlpha + c1 * alpha) / 255);
409 				bottom[1] = (uint8)((bottom[1] * destAlpha + c2 * alpha) / 255);
410 				bottom[2] = (uint8)((bottom[2] * destAlpha + c3 * alpha) / 255);
413 				uint32 alphaTemp = (65025 - alphaRest * (255 - bottom[3]));
414 				uint32 alphaDest = bottom[3] * alphaRest;
416 				bottom[0] = (bottom[0] * alphaDest + c1 * alphaSrc) / alphaTemp;
417 				bottom[1] = (bottom[1] * alphaDest + c2 * alphaSrc) / alphaTemp;
418 				bottom[2] = (bottom[2] * alphaDest + c3 * alphaSrc) / alphaTemp;
419 				bottom[3] = alphaTemp / 255;
427 blend_colors(uint8* bottom, uint8* source, uint8 alphaOverride)
431 		if (bottom[3] == 0 || alpha == 255) {
432 			bottom[0] = source[0];
433 			bottom[1] = source[1];
434 			bottom[2] = source[2];
435 			bottom[3] = alpha;
437 			if (bottom[3] == 255) {
439 				bottom[0] = (uint8)((bottom[0] * destAlpha + source[0] * alpha) / 255);
440 				bottom[1] = (uint8)((bottom[1] * destAlpha + source[1] * alpha) / 255);
441 				bottom[2] = (uint8)((bottom[2] * destAlpha + source[2] * alpha) / 255);
444 				uint32 alphaTemp = (65025 - alphaRest * (255 - bottom[3]));
445 				uint32 alphaDest = bottom[3] * alphaRest;
447 				bottom[0] = (bottom[0] * alphaDest + source[0] * alphaSrc) / alphaTemp;
448 				bottom[1] = (bottom[1] * alphaDest + source[1] * alphaSrc) / alphaTemp;
449 				bottom[2] = (bottom[2] * alphaDest + source[2] * alphaSrc) / alphaTemp;
450 				bottom[3] = alphaTemp / 255;
458 blend_colors(uint8* bottom, uint8* source)
461 		if (bottom[3] == 0 || source[3] == 255) {
462 			bottom[0] = source[0];
463 			bottom[1] = source[1];
464 			bottom[2] = source[2];
465 			bottom[3] = source[3];
467 			if (bottom[3] == 255) {
469 				bottom[0] = (uint8)((bottom[0] * destAlpha + source[0] * source[3]) / 255);
470 				bottom[1] = (uint8)((bottom[1] * destAlpha + source[1] * source[3]) / 255);
471 				bottom[2] = (uint8)((bottom[2] * destAlpha + source[2] * source[3]) / 255);
474 				uint32 alphaTemp = (65025 - alphaRest * (255 - bottom[3]));
475 				uint32 alphaDest = bottom[3] * alphaRest;
477 				bottom[0] = (bottom[0] * alphaDest + source[0] * alphaSrc) / alphaTemp;
478 				bottom[1] = (bottom[1] * alphaDest + source[1] * alphaSrc) / alphaTemp;
479 				bottom[2] = (bottom[2] * alphaDest + source[2] * alphaSrc) / alphaTemp;
480 				bottom[3] = alphaTemp / 255;
488 blend_colors_copy(uint8* dest, uint8* bottom, uint8* top)
490 	if (bottom[3] == 0 || top[3] == 255) {
496 		if (bottom[3] == 255) {
498 			dest[0] = (uint8)((bottom[0] * destAlpha + top[0] * top[3]) / 255);
499 			dest[1] = (uint8)((bottom[1] * destAlpha + top[1] * top[3]) / 255);
500 			dest[2] = (uint8)((bottom[2] * destAlpha + top[2] * top[3]) / 255);
504 			uint32 alphaTemp = (65025 - alphaRest * (255 - bottom[3]));
505 			uint32 alphaDest = bottom[3] * alphaRest;
507 			dest[0] = (bottom[0] * alphaDest + top[0] * alphaSrc) / alphaTemp;
508 			dest[1] = (bottom[1] * alphaDest + top[1] * alphaSrc) / alphaTemp;
509 			dest[2] = (bottom[2] * alphaDest + top[2] * alphaSrc) / alphaTemp;
517 blend_pixels(uint8* bottom, uint8* top, uint8 alpha)
521 			bottom[0] = top[0];
522 			bottom[1] = top[1];
523 			bottom[2] = top[2];
524 			bottom[3] = top[3];
526 			uint8 mergeAlpha = bottom[3] ? (top[3] * alpha) / 255 : 255;
528 			bottom[0] = (bottom[0] * invAlpha + top[0] * mergeAlpha) / 255;
529 			bottom[1] = (bottom[1] * invAlpha + top[1] * mergeAlpha) / 255;
530 			bottom[2] = (bottom[2] * invAlpha + top[2] * mergeAlpha) / 255;
531 			bottom[3] = (bottom[3] * (255 - alpha) + top[3] * alpha) / 255;
538 blend_pixels_copy(uint8* bottom, uint8* top, uint8* dest, uint8 alpha)
547 			uint8 mergeAlpha = bottom[3] ? (top[3] * alpha) / 255 : 255;
549 			dest[0] = (bottom[0] * invAlpha + top[0] * mergeAlpha) / 255;
550 			dest[1] = (bottom[1] * invAlpha + top[1] * mergeAlpha) / 255;
551 			dest[2] = (bottom[2] * invAlpha + top[2] * mergeAlpha) / 255;
552 			dest[3] = (bottom[3] * (255 - alpha) + top[3] * alpha) / 255;
555 		dest[0] = bottom[0];
556 		dest[1] = bottom[1];
557 		dest[2] = bottom[2];
558 		dest[3] = bottom[3];
564 blend_pixels_overlay(uint8* bottom, uint8* top, uint8 alphaOverride)
569 			bottom[0] = top[0];
570 			bottom[1] = top[1];
571 			bottom[2] = top[2];
572 			bottom[3] = top[3];
574 			uint8 mergeAlpha = bottom[3] ? alpha : 255;
576 			bottom[0] = (bottom[0] * invAlpha + top[0] * mergeAlpha) / 255;
577 			bottom[1] = (bottom[1] * invAlpha + top[1] * mergeAlpha) / 255;
578 			bottom[2] = (bottom[2] * invAlpha + top[2] * mergeAlpha) / 255;
579 			bottom[3] = (bottom[3] * (255 - alpha) + top[3] * alpha) / 255;
586 blend_pixels_overlay_copy(uint8* bottom, uint8* top, uint8* dest, uint8 alphaOverride)
596 			uint8 mergeAlpha = bottom[3] ? alpha : 255;
598 			dest[0] = (bottom[0] * invAlpha + top[0] * mergeAlpha) / 255;
599 			dest[1] = (bottom[1] * invAlpha + top[1] * mergeAlpha) / 255;
600 			dest[2] = (bottom[2] * invAlpha + top[2] * mergeAlpha) / 255;
601 			dest[3] = (bottom[3] * (255 - alpha) + top[3] * alpha) / 255;
604 		dest[0] = bottom[0];
605 		dest[1] = bottom[1];
606 		dest[2] = bottom[2];
607 		dest[3] = bottom[3];