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

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icculus committed Jan 10, 2010
1 parent 49fd936 commit 77ecf956e739dba789af44948d324ba2886771ef
Showing with 3 additions and 3 deletions.
  1. +3 −3 src/video/SDL_blit.h
@@ -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)


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