From 6952f867c6f506b89ca807fa986198f022ab0926 Mon Sep 17 00:00:00 2001
From: Andreas Aardal Hanssen <andreas.aardal.hanssen@nokia.com>
Date: Tue, 16 Jun 2009 09:48:05 +0200
Subject: Early exit from QRegion::intersects() if there is only one rect.

Don't waste cycles with constructing a vector with rectangles if
there is only one rectangle in the source region.

Same as 36ff1b507bf2d509019ae8ddd638922b09755c6b, but for
QRegion::intersects(QRect).

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 946d880..03e01c9 100644
--- a/src/gui/painting/qregion.cpp
+++ b/src/gui/painting/qregion.cpp
@@ -725,6 +725,8 @@ bool QRegion::intersects(const QRect &rect) const
     const QRect r = rect.normalized();
     if (!rect_intersects(boundingRect(), r))
         return false;
+    if (numRects() == 1)
+        return true;
 
     const QVector<QRect> myRects = rects();
     for (QVector<QRect>::const_iterator it = myRects.constBegin(); it < myRects.constEnd(); ++it)
-- 
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