wonderbrush/support/blending.h

38 			uint16 t1, uint16 t2, uint16 t3, uint8 ta,	// top components
62 	  uint8 t1, uint8 t2, uint8 t3, uint8 ta,		// top components
216 blend_colors_copy(uint8* dest, uint8* bottom, uint8* top)
218 	if (bottom[3] == 0 || top[3] == 255) {
219 		dest[0] = top[0];
220 		dest[1] = top[1];
221 		dest[2] = top[2];
222 		dest[3] = top[3];
225 				  top[0], top[1], top[2], top[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];
242 			uint16 t1 = kGammaTable[top[0]];
243 			uint16 t2 = kGammaTable[top[1]];
244 			uint16 t3 = kGammaTable[top[2]];
249 			uint8 mergeAlpha = bottom[3] ? (top[3] * alpha) / 255 : 255;
254 			bottom[3] = (bottom[3] * (255 - alpha) + top[3] * alpha) / 255;
261 blend_pixels_copy(uint8* bottom, uint8* top, uint8* dest, uint8 alpha)
265 			dest[0] = top[0];
266 			dest[1] = top[1];
267 			dest[2] = top[2];
268 			dest[3] = top[3];
271 			uint16 t1 = kGammaTable[top[0]];
272 			uint16 t2 = kGammaTable[top[1]];
273 			uint16 t3 = kGammaTable[top[2]];
278 			uint8 mergeAlpha = bottom[3] ? (top[3] * alpha) / 255 : 255;
283 			dest[3] = (bottom[3] * (255 - alpha) + top[3] * alpha) / 255;
295 blend_pixels_overlay(uint8* bottom, uint8* top, uint8 alphaOverride)
297 	uint8 alpha = (top[3] * alphaOverride) / 255;
300 			bottom[0] = top[0];
301 			bottom[1] = top[1];
302 			bottom[2] = top[2];
303 			bottom[3] = top[3];
306 			uint16 t1 = kGammaTable[top[0]];
307 			uint16 t2 = kGammaTable[top[1]];
308 			uint16 t3 = kGammaTable[top[2]];
318 			bottom[3] = (bottom[3] * (255 - alpha) + top[3] * alpha) / 255;
325 blend_pixels_overlay_copy(uint8* bottom, uint8* top, uint8* dest, uint8 alphaOverride)
327 	uint8 alpha = (top[3] * alphaOverride) / 255;
330 			dest[0] = top[0];
331 			dest[1] = top[1];
332 			dest[2] = top[2];
333 			dest[3] = top[3];
336 			uint16 t1 = kGammaTable[top[0]];
337 			uint16 t2 = kGammaTable[top[1]];
338 			uint16 t3 = kGammaTable[top[2]];
348 			dest[3] = (bottom[3] * (255 - alpha) + top[3] * alpha) / 255;
488 blend_colors_copy(uint8* dest, uint8* bottom, uint8* top)
490 	if (bottom[3] == 0 || top[3] == 255) {
491 		dest[0] = top[0];
492 		dest[1] = top[1];
493 		dest[2] = top[2];
494 		dest[3] = top[3];
497 			uint32 destAlpha = 255 - top[3];
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);
503 			uint8 alphaRest = 255 - top[3];
506 			uint32 alphaSrc = 255 * top[3];
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)
542 			dest[0] = top[0];
543 			dest[1] = top[1];
544 			dest[2] = top[2];
545 			dest[3] = top[3];
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;
564 blend_pixels_overlay(uint8* bottom, uint8* top, uint8 alphaOverride)
566 	uint8 alpha = (top[3] * alphaOverride) / 255;
569 			bottom[0] = top[0];
570 			bottom[1] = top[1];
571 			bottom[2] = top[2];
572 			bottom[3] = top[3];
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)
588 	uint8 alpha = (top[3] * alphaOverride) / 255;
591 			dest[0] = top[0];
592 			dest[1] = top[1];
593 			dest[2] = top[2];
594 			dest[3] = top[3];
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;