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≈20% faster, 2 times more precisely (0.17% difference against 0.37%)

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homm 2013-03-25 09:49:35 +04:00
parent af96b5d4b2
commit a83ef0f0ed
1 changed files with 1 additions and 1 deletions
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2
libImaging/AlphaComposite.c
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@ -74,7 +74,7 @@ ImagingAlphaComposite(Imaging imDst, Imaging imSrc)
// There we use 7 bits for precision.
// We could use more, but we go beyond 32 bits.
UINT16 coef1 = src->a * 255 * 255 * 128 / outa255;
UINT16 coef2 = blend * 255 * 128 / outa255;
UINT16 coef2 = 255 * 128 - coef1;
#define SHIFTFORDIV255(a)\
((a >> 8) + a >> 8)