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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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4
graphics/transparent_surface.cpp
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@ -719,14 +719,16 @@ 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);
if (!skipTransparent || a)
a = alpha;
((uint32 *)pixels)[i * w + j] = format.ARGBToColor(a, r, g, b);
}

2
graphics/transparent_surface.h
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@ -137,7 +137,7 @@ struct TransparentSurface : public Graphics::Surface {
TSpriteBlendMode blend = BLEND_NORMAL);
void applyColorKey(uint8 r, uint8 g, uint8 b, bool overwriteAlpha = false);
void setAlpha(uint8 alpha);
void setAlpha(uint8 alpha, bool skipTransparent = false);
/**
* @brief Scale function; this returns a transformed version of this surface after rotation and