From 8939fcff13467297930d2655ff02e1523a9db84f Mon Sep 17 00:00:00 2001
From: John Firebaugh <jfirebaugh@kde.org>
Date: Sun, 22 Jul 2001 16:34:30 +0000
Subject: [PATCH] Don't crash when mousing over certain icons.

svn path=/trunk/kdebase/kwin/; revision=107192
---
 clients/default/kdedefault.cpp | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/clients/default/kdedefault.cpp b/clients/default/kdedefault.cpp
index 3e97172caf..10b9bd80ba 100644
--- a/clients/default/kdedefault.cpp
+++ b/clients/default/kdedefault.cpp
@@ -521,10 +521,12 @@ void KDEDefaultButton::drawButton(QPainter *p)
 
 		// Intensify the image if required
 		if (isMouseOver) {
-			QBitmap mask = *btnpix.mask();
-			btnpix.detach();
-			btnpix = KPixmapEffect::intensity(btnpix, 0.8);
-			btnpix.setMask( mask );
+			const QBitmap* mask = btnpix.mask();
+			if( mask != 0 ) {
+				btnpix.detach();
+				btnpix = KPixmapEffect::intensity(btnpix, 0.8);
+				btnpix.setMask( *mask );
+			}
 		}
 
 		// Smooth scale the pixmap for small titlebars