From e98d4aece51fa8691cf33325ab96634fcf9baa81 Mon Sep 17 00:00:00 2001
From: Paul Olav Tvete <paul.tvete@nokia.com>
Date: Wed, 3 Mar 2010 17:37:09 +0100
Subject: Fix compositing when QWS background is completely transparent.

Specifying the wrong composition mode triggered an optimization which
caused uninitialized values to be blended in.

Task-number: QTBUG-6625, QTBUG-6906
Reviewed-by: Samuel
---
 src/gui/embedded/qscreen_qws.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/gui/embedded/qscreen_qws.cpp b/src/gui/embedded/qscreen_qws.cpp
index 8eb8123..9bd73a4 100644
--- a/src/gui/embedded/qscreen_qws.cpp
+++ b/src/gui/embedded/qscreen_qws.cpp
@@ -2739,7 +2739,7 @@ void QScreen::compose(int level, const QRegion &exposed, QRegion &blend,
             default:
                 break;
             }
-            spanData.setup(qwsServer->backgroundBrush(), 256, QPainter::CompositionMode_SourceOver);
+            spanData.setup(qwsServer->backgroundBrush(), 256, QPainter::CompositionMode_Source);
             spanData.dx = off.x();
             spanData.dy = off.y();
         } else if (!surface->isBuffered()) {
-- 
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