Rendering to QPixmap supports antialiasing nowadays

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@15324 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: wonder

src/gui/qgsmapcanvasmap.cpp

@@ -61,11 +61,6 @@ void QgsMapCanvasMap::setPanningOffset( const QPoint& point )
 
 void QgsMapCanvasMap::render()
 {
-  // Rendering to a QImage gives incorrectly filled polygons in some
-  // cases (as at Qt4.1.4), but it is the only renderer that supports
-  // anti-aliasing, so we provide the means to swap between QImage and
-  // QPixmap.
-
   if ( mUseQImageToRender )
   {
     // use temporary image for rendering
@@ -99,6 +94,11 @@ void QgsMapCanvasMap::render()
     paint.begin( &mPixmap );
     // Clip our drawing to the QPixmap
     paint.setClipRect( mPixmap.rect() );
+
+    // antialiasing
+    if ( mAntiAliasing )
+      paint.setRenderHint( QPainter::Antialiasing );
+
     mCanvas->mapRenderer()->render( &paint );
     paint.end();
   }