From a038afba319658dafcf7d32e20b4aad4589af5c9 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Mon, 16 Nov 2009 09:47:34 +0000
Subject: [PATCH] Thank you automated tests (and bobbens!), fixed alpha
 blending for accuracy

---
 src/video/SDL_blit.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/video/SDL_blit.h b/src/video/SDL_blit.h
index 0b4578847..c58a76a18 100644
--- 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)