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GRAPHICS: Enhanced setAlpha method

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This commit is contained in:
Eugene Sandulenko 2019-01-01 23:06:35 +01:00
parent 8259a8aa33
commit b45cadb065
2 changed files with 5 additions and 3 deletions
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6
graphics/transparent_surface.cpp
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@ -719,15 +719,17 @@ void TransparentSurface::applyColorKey(uint8 rKey, uint8 gKey, uint8 bKey, bool
/**
* Sets alpha channel for all pixels to specified value
* @param alpha value of the alpha channel to set
* @param skipTransparent if set to true, then do not touch pixels with alpha=0
*/
void TransparentSurface::setAlpha(uint8 alpha) {
void TransparentSurface::setAlpha(uint8 alpha, bool skipTransparent) {
assert(format.bytesPerPixel == 4);
for (int i = 0; i < h; i++) {
for (int j = 0; j < w; j++) {
uint32 pix = ((uint32 *)pixels)[i * w + j];
uint8 r, g, b, a;
format.colorToARGB(pix, a, r, g, b);
a = alpha;
if (!skipTransparent || a)
a = alpha;
((uint32 *)pixels)[i * w + j] = format.ARGBToColor(a, r, g, b);
}
}