--- qsgpainternode.cpp	2014-07-29 13:29:03.000000000 +0900
+++ qsgpainternode.cpp.new	2014-07-29 13:30:19.000000000 +0900
@@ -171,6 +171,12 @@
     painter.end();
 
     if (m_actualRenderTarget == QQuickPaintedItem::Image) {
+       QPixmap pixmap(m_size*2);
+       pixmap.setDevicePixelRatio(2.0);
+       pixmap.convertFromImage(m_image);
+       pixmap.scaled(m_size);
+       m_image = pixmap.toImage();
+
         m_texture->setImage(m_image);
         m_texture->setDirtyRect(dirtyRect);
     } else if (m_multisampledFbo) {
@@ -292,8 +298,8 @@
     } else {
         if (!m_image.isNull() && !m_dirtyGeometry)
             return;
-
-        m_image = QImage(m_size, QImage::Format_ARGB32_Premultiplied);
+        m_image = QImage(m_size*2, QImage::Format_ARGB32_Premultiplied);
+        m_image.setDevicePixelRatio(2);
         m_image.fill(Qt::transparent);
     }