OrdinaryMagician/vkdoom_m
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Remove premultiplied alpha

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This commit is contained in:
Magnus Norddahl 2016-08-14 05:10:34 +02:00
commit f56250b910
2 changed files with 17 additions and 18 deletions
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12
src/textures/texture.cpp
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@ -354,22 +354,14 @@ void FTexture::GenerateBgraFromBitmap(const FBitmap &bitmap)
{
CreatePixelsBgraWithMipmaps();
// Transpose and premultiply alpha
// Transpose
const uint32_t *src = (const uint32_t *)bitmap.GetPixels();
uint32_t *dest = PixelsBgra.data();
for (int x = 0; x < Width; x++)
{
for (int y = 0; y < Height; y++)
{
uint32_t p = src[x + y * Width];
uint32_t red = RPART(p);
uint32_t green = GPART(p);
uint32_t blue = BPART(p);
uint32_t alpha = APART(p);
red = (red * alpha + 127) / 255;
green = (green * alpha + 127) / 255;
blue = (blue * alpha + 127) / 255;
dest[y + x * Height] = (alpha << 24) | (red << 16) | (green << 8) | blue;
dest[y + x * Height] = src[x + y * Width];
}
}