From 4cd1d5ce5fed9519a8c093424ca1ed9beb38dd5e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Samuel=20R=C3=B8dal?= <samuel.rodal@nokia.com>
Date: Thu, 1 Jul 2010 14:31:34 +0200
Subject: Fixed bug in drawTiledPixmap when width of pixmap matches target
 rect.

qt_memconvert's duff's device implementation assumes that count is > 0,
if count is 0 it will still blit eight pixels.

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

diff --git a/src/gui/painting/qdrawhelper.cpp b/src/gui/painting/qdrawhelper.cpp
index d7f7dc3..ca9556b 100644
--- a/src/gui/painting/qdrawhelper.cpp
+++ b/src/gui/painting/qdrawhelper.cpp
@@ -5014,7 +5014,8 @@ Q_STATIC_TEMPLATE_FUNCTION void blendTiled(int count, const QSpan *spans, void *
                 length -= copy_image_width;
                 copy_image_width *= 2;
             }
-            qt_memconvert(dest, src, length);
+            if (length > 0)
+                qt_memconvert(dest, src, length);
         } else {
             while (length) {
                 int l = qMin(image_width - sx, length);
-- 
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