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Merged r4992:4993 from branches/SDL-1.2: increased alpha blend accuracy.

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--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%404376
This commit is contained in:
Ryan C. Gordon 2010-01-10 06:18:39 +00:00
parent 44a9cf985c
commit 3a00b48ce0
1 changed files with 3 additions and 3 deletions
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6
src/video/SDL_blit.h
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@ -444,9 +444,9 @@ do { \
/* Blend the RGB values of two Pixels based on a source alpha value */
#define ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB) \
do { \
dR = ((((int)(sR-dR)*(int)A)/255)+dR); \
dG = ((((int)(sG-dG)*(int)A)/255)+dG); \
dB = ((((int)(sB-dB)*(int)A)/255)+dB); \
dR = (((((int)(sR-dR)*((int)A))+255)/255)+dR); \
dG = (((((int)(sG-dG)*((int)A))+255)/255)+dG); \
dB = (((((int)(sB-dB)*((int)A))+255)/255)+dB); \
} while(0)