Lines Matching refs:alpha
23 : BControl("alpha slider", NULL, message,
277 blend_colors(uint8* d, uint8 alpha, uint8 c1, uint8 c2, uint8 c3)
279 if (alpha > 0) {
280 if (alpha == 255) {
285 d[0] += (uint8)(((c1 - d[0]) * alpha) >> 8);
286 d[1] += (uint8)(((c2 - d[1]) * alpha) >> 8);
287 d[2] += (uint8)(((c3 - d[2]) * alpha) >> 8);
299 // fill in top row with alpha gradient
327 // post process bitmap to underlay it with a pattern to visualize alpha
332 uint8 alpha = p[3];
333 if (alpha < 255) {
335 alpha = 255 - alpha;
338 blend_colors(p, alpha,
343 blend_colors(p, alpha,
350 blend_colors(p, alpha,
355 blend_colors(p, alpha,