From ff57b90c0419a7058cf44413ab19d5aac7fb5f50 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Samuel=20R=C3=B8dal?= <sroedal@trolltech.com>
Date: Tue, 28 Apr 2009 10:03:58 +0200
Subject: Improved performance for pixmaps containing 0-alpha pixels.

Areas of 0-alpha are quite common in ARGB images/pixmaps, so special
case them in the argb32 on argb32 image blend function.

Reviewed-by: Trond
---
 src/gui/painting/qblendfunctions.cpp | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/gui/painting/qblendfunctions.cpp b/src/gui/painting/qblendfunctions.cpp
index dd7b016..16dd617 100644
--- a/src/gui/painting/qblendfunctions.cpp
+++ b/src/gui/painting/qblendfunctions.cpp
@@ -518,11 +518,10 @@ static void qt_blend_argb32_on_argb32(uchar *destPixels, int dbpl,
         for (int y=0; y<h; ++y) {
             for (int x=0; x<w; ++x) {
                 uint s = src[x];
-                if ((s & 0xff000000) == 0xff000000)
+                if (s >= 0xff000000)
                     dst[x] = s;
-                else {
+                else if (s != 0)
                     dst[x] = s + BYTE_MUL(dst[x], qAlpha(~s));
-                }
             }
             dst = (quint32 *)(((uchar *) dst) + dbpl);
             src = (const quint32 *)(((const uchar *) src) + sbpl);
-- 
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