From 315e0521c9b65a83a6b034dbe9d3c344b1959049 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Wed, 3 Mar 2010 10:11:54 +0000
Subject: [PATCH] From Martin Beckett, "I tested DJ's fix to stop flicker on
 Windows + Qt viewer on 2.6.7

It solves the problem on XP and Win7 on Qt 4.5 and 4.62
It isn't necessary on Linux (ubuntu 8.10/9.04 Qt 4.5/4.6.2) but doesn't cause any harm.
But I have #ifdef'ed it with WIN32. I can't test it on 64bit windows (not sure if x64 defines WIN32?)"
---
 examples/osgviewerQT/QOSGWidget.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/examples/osgviewerQT/QOSGWidget.cpp b/examples/osgviewerQT/QOSGWidget.cpp
index 68912a04b..e89a5d99d 100644
--- a/examples/osgviewerQT/QOSGWidget.cpp
+++ b/examples/osgviewerQT/QOSGWidget.cpp
@@ -91,6 +91,11 @@ class QOSGWidget : public QWidget
         osgViewer::GraphicsWindow* getGraphicsWindow() { return _gw.get(); }
         const osgViewer::GraphicsWindow* getGraphicsWindow() const { return _gw.get(); }
 
+#ifdef WIN32
+        // Prevent flicker on Windows Qt
+        QPaintEngine* paintEngine () const { return 0; }
+#endif
+
     protected:
 
         void init();