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Fixed alpha calculation in Image::Copy with applyAlpha = true

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git-svn-id: https://sfml.svn.sourceforge.net/svnroot/sfml/branches/sfml2@1312 4e206d99-4929-0410-ac5d-dfc041789085
This commit is contained in:
LaurentGom 2009-12-27 23:23:45 +00:00
parent 7947044a83
commit 1f2b441c9a
1 changed files with 2 additions and 1 deletions
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3
src/SFML/Graphics/Image.cpp
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@ -299,11 +299,12 @@ void Image::Copy(const Image& source, unsigned int destX, unsigned int destY, co
const Uint8* src = srcPixels + j * 4;
Uint8* dst = dstPixels + j * 4;
// Interpolate RGB components using the alpha value of the source pixel
// Interpolate RGBA components using the alpha value of the source pixel
Uint8 alpha = src[3];
dst[0] = (src[0] * alpha + dst[0] * (255 - alpha)) / 255;
dst[1] = (src[1] * alpha + dst[1] * (255 - alpha)) / 255;
dst[2] = (src[2] * alpha + dst[2] * (255 - alpha)) / 255;
dst[3] = alpha + dst[3] * (255 - alpha) / 255;
}
srcPixels += srcStride;