Handle QVolatileImage-backed pixmaps optimally in drawPixmap().

When drawing such pixmaps (used by both the openvg and opengl graphics
systems) onto another pixmap or to a QImage, the performance was
sub-optimal due to missing and accidentally disabled support
specific to QVolatileImage. This is now fixed and drawing pixmaps into
a QImage is also made optimal by using the QS60PaintEngine for
QImage too. This will cause a 5-7x (or even up to 12x on certain
hardware and platform) increase in offscreen pixmap drawing
performance.

Task-number: QTBUG-19880
Reviewed-by: Jani Hautakangas

1 files changed, 1 insertions, 1 deletions

diff --git a/src/openvg/qpixmapdata_vg_p.h b/src/openvg/qpixmapdata_vg_p.h
index 18846f3..4a969c0 100644
--- a/src/openvg/qpixmapdata_vg_p.h
+++ b/src/openvg/qpixmapdata_vg_p.h
@@ -138,7 +138,7 @@ public:
     QSize size() const { return QSize(w, h); }
 
 #if defined(Q_OS_SYMBIAN)
-    QVolatileImage toVolatileImage() const { return source; }
+    QVolatileImage toVolatileImage() const;
     void* toNativeType(NativeType type);
     void fromNativeType(void* pixmap, NativeType type);
     bool initFromNativeImageHandle(void *handle, const QString &type);