diff -ur kdegraphics-4.2.2/kolourpaint/pixmapfx/kpPixmapFX_MaskOps.cpp kdegraphics-4.2.2-kolourpaint-kde#183850-workaround/kolourpaint/pixmapfx/kpPixmapFX_MaskOps.cpp

--- kdegraphics-4.2.2/kolourpaint/pixmapfx/kpPixmapFX_MaskOps.cpp	2008-12-21 21:19:06.000000000 +0100

+++ kdegraphics-4.2.2-kolourpaint-kde#183850-workaround/kolourpaint/pixmapfx/kpPixmapFX_MaskOps.cpp	2009-04-03 15:23:49.000000000 +0200

@@ -252,7 +252,7 @@

         // Copy RGB layer.

         *destPixmapPtr = QPixmap (oldPixmap.width (), oldPixmap.height ());

         QPainter p (destPixmapPtr);

-        p.drawPixmap (QPoint (0, 0), oldPixmap);

+        p.drawImage (QPoint (0, 0), oldPixmap.toImage());

         p.end ();

         // Copy mask layer (if any).