From 36ff1b507bf2d509019ae8ddd638922b09755c6b Mon Sep 17 00:00:00 2001
From: Andreas Aardal Hanssen <andreas.aardal.hanssen@nokia.com>
Date: Tue, 16 Jun 2009 09:40:41 +0200
Subject: Early exit from QRegion::intersects() if there is only one rect.

Don't waste cycles with constructing two vectors with rectangles if
there is only one rectangle in each of the two regions.

Reviewed-by: Lars
Reviewed-by: bnilsen
---
 src/gui/painting/qregion.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/gui/painting/qregion.cpp b/src/gui/painting/qregion.cpp
index c4cd77a..946d880 100644
--- a/src/gui/painting/qregion.cpp
+++ b/src/gui/painting/qregion.cpp
@@ -698,6 +698,8 @@ bool QRegion::intersects(const QRegion &region) const
 
     if (!rect_intersects(boundingRect(), region.boundingRect()))
         return false;
+    if (numRects() == 1 && region.numRects() == 1)
+        return true;
 
     const QVector<QRect> myRects = rects();
     const QVector<QRect> otherRects = region.rects();
-- 
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