From a83ef0f0ed65961eace4869fcf6aa906576caed0 Mon Sep 17 00:00:00 2001
From: homm <homm86@gmail.com>
Date: Mon, 25 Mar 2013 09:49:35 +0400
Subject: [PATCH] =?UTF-8?q?=E2=89=8820%=20faster,=202=20times=20more=20pre?=
 =?UTF-8?q?cisely=20(0.17%=20difference=20against=200.37%)?=
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---
 libImaging/AlphaComposite.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libImaging/AlphaComposite.c b/libImaging/AlphaComposite.c
index 93afe2a95..86af8e940 100644
--- a/libImaging/AlphaComposite.c
+++ b/libImaging/AlphaComposite.c
@@ -74,7 +74,7 @@ ImagingAlphaComposite(Imaging imDst, Imaging imSrc)
                 // There we use 7 bits for precision.
                 // We could use more, but we go beyond 32 bits.
                 UINT16 coef1 = src->a * 255 * 255 * 128 / outa255;
-                UINT16 coef2 = blend * 255 * 128 / outa255;
+                UINT16 coef2 = 255 * 128 - coef1;
 
                 #define SHIFTFORDIV255(a)\
                     ((a >> 8) + a >> 8)