backport commit 908403 from trunk

QImage.fill take a uint not a QColor so this color (Qt::transparent enum with 19 as a value) is invalid.

svn path=/branches/KDE/4.2/kdebase/workspace/; revision=908406

effects/showfps.cpp

@@ -434,7 +434,7 @@ void ShowFpsEffect::paintFPSText(int fps)
         return;
 #ifdef KWIN_HAVE_OPENGL_COMPOSITING
     QImage im(100, 100, QImage::Format_ARGB32);
-    im.fill(Qt::transparent);
+    im.fill(0);
     QPainter painter(&im);
     painter.setFont(textFont);
     painter.setPen(textColor);