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

…curacy
libsdl-org · Nov 16, 2009 · a038afb · a038afb
1 parent 88c6487
commit a038afb
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/src/video/SDL_blit.h b/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 = (((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)