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Thank you automated tests (and bobbens!), fixed alpha blending for accuracy

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This commit is contained in:
Sam Lantinga 2009-11-16 09:47:34 +00:00
parent 0b1a37f8ba
commit e024bcf596
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 = (((sR-dR)*(A)+255)>>8)+dR; \
dG = (((sG-dG)*(A)+255)>>8)+dG; \
dB = (((sB-dB)*(A)+255)>>8)+dB; \
dR = ((((int)(sR-dR)*(int)A)/255)+dR); \
dG = ((((int)(sG-dG)*(int)A)/255)+dG); \
dB = ((((int)(sB-dB)*(int)A)/255)+dB); \
} while(0)