From 7bf2de5adf62f45c8d7fcba22e2cf9ea427b5b37 Mon Sep 17 00:00:00 2001
From: Michael Dominic K <mdk@codethink.co.uk>
Date: Tue, 5 Oct 2010 16:54:20 +0200
Subject: Adding a threshold for partial updates.
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Merge-request: 841
Reviewed-by: Samuel Rødal <samuel.rodal@nokia.com>
---
 src/opengl/qwindowsurface_gl.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/opengl/qwindowsurface_gl.cpp b/src/opengl/qwindowsurface_gl.cpp
index f98dcff..8157b2a 100644
--- a/src/opengl/qwindowsurface_gl.cpp
+++ b/src/opengl/qwindowsurface_gl.cpp
@@ -534,8 +534,9 @@ void QGLWindowSurface::flush(QWidget *widget, const QRegion &rgn, const QPoint &
                 }
             }
 #endif
-            if (d_ptr->paintedRegion.boundingRect() != geometry() && 
-                hasPartialUpdateSupport()) {
+            if (hasPartialUpdateSupport() &&
+                d_ptr->paintedRegion.boundingRect().width() * d_ptr->paintedRegion.boundingRect().height() <
+                geometry().width() * geometry().height() * 0.2) {
                 context()->d_func()->swapRegion(&d_ptr->paintedRegion);             
             } else
                 context()->swapBuffers();
-- 
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