diff -r 2f34d5167611 -r fcece45ef507 src/gui/painting/qwindowsurface_s60.cpp
--- a/src/gui/painting/qwindowsurface_s60.cpp	Fri Apr 16 15:50:13 2010 +0300
+++ b/src/gui/painting/qwindowsurface_s60.cpp	Mon May 03 13:17:34 2010 +0300
@@ -70,13 +70,13 @@
     // We create empty CFbsBitmap here -> it will be resized in setGeometry
     CFbsBitmap *bitmap = q_check_ptr(new CFbsBitmap);	// CBase derived object needs check on new
     qt_symbian_throwIfError( bitmap->Create( TSize(0, 0), mode ) );
-	
+
     QS60PixmapData *data = new QS60PixmapData(QPixmapData::PixmapType);
     if (data) {
         data->fromSymbianBitmap(bitmap, true);
         d_ptr->device = QPixmap(data);
     }
-        
+
     setStaticContentsSupport(true);
 }
 QS60WindowSurface::~QS60WindowSurface()
@@ -89,24 +89,15 @@
     if (!qt_widget_private(window())->isOpaque) {
         QS60PixmapData *pixmapData = static_cast<QS60PixmapData *>(d_ptr->device.data_ptr().data());
         pixmapData->beginDataAccess();
-        QImage &image = pixmapData->image;
-        QRgb *data = reinterpret_cast<QRgb *>(image.bits());
-        const int row_stride = image.bytesPerLine() / 4;
-
-        const QVector<QRect> rects = rgn.rects();
-        for (QVector<QRect>::const_iterator it = rects.begin(); it != rects.end(); ++it) {
-            const int x_start = it->x();
-            const int width = it->width();
 
-            const int y_start = it->y();
-            const int height = it->height();
+        QPainter p(&pixmapData->image);
+        p.setCompositionMode(QPainter::CompositionMode_Source);
+        const QVector<QRect> rects = rgn.rects();
+        const QColor blank = Qt::transparent;
+        for (QVector<QRect>::const_iterator it = rects.begin(); it != rects.end(); ++it) {
+            p.fillRect(*it, blank);
+        }
 
-            QRgb *row = data + row_stride * y_start;
-            for (int y = 0; y < height; ++y) {
-                qt_memfill(row + x_start, 0U, width);
-                row += row_stride;
-            }
-        }
         pixmapData->endDataAccess();
     }
 }
@@ -128,7 +119,7 @@
 
     const QPoint off = offset(widget);
     QImage *img = &(static_cast<QS60PixmapData *>(d_ptr->device.data_ptr().data())->image);
-    
+
     QRect rect(off, widget->size());
     rect &= QRect(QPoint(), img->size());