Add support for Qt::WA_TranslucentBackground with OpenVG on Symbian^3

S^3 does not have a client side API to support semi-transparent EGL
surfaces so if this flag is enabled for a particular widget, then we
should return a raster surface instead of a VG surface. Raster surfaces
can still be semi-transparent but will be slower to render to.

Task-number: QTBUG-14400
Reviewed-by: Jani Hautakangas
Reviewed-by: Gareth Stockwell
Reviewed-by: Sami Merila

1 files changed, 8 insertions, 0 deletions

diff --git a/src/plugins/graphicssystems/openvg/qgraphicssystem_vg.cpp b/src/plugins/graphicssystems/openvg/qgraphicssystem_vg.cpp
index 2c7c0b7..9674233 100644
--- a/src/plugins/graphicssystems/openvg/qgraphicssystem_vg.cpp
+++ b/src/plugins/graphicssystems/openvg/qgraphicssystem_vg.cpp
@@ -42,6 +42,9 @@
 #include "qgraphicssystem_vg_p.h"
 #include <QtOpenVG/private/qpixmapdata_vg_p.h>
 #include <QtOpenVG/private/qwindowsurface_vg_p.h>
+#if defined(Q_OS_SYMBIAN) && !defined(Q_SYMBIAN_SEMITRANSPARENT_BG_SURFACE)
+#include <QtGui/private/qwidget_p.h>
+#endif
 
 QT_BEGIN_NAMESPACE
 
@@ -64,6 +67,11 @@ QPixmapData *QVGGraphicsSystem::createPixmapData(QPixmapData::PixelType type) co
 
 QWindowSurface *QVGGraphicsSystem::createWindowSurface(QWidget *widget) const
 {
+#if defined(Q_OS_SYMBIAN) && !defined(Q_SYMBIAN_SEMITRANSPARENT_BG_SURFACE)
+    QWidgetPrivate *d = qt_widget_private(widget);
+    if (!d->isOpaque && widget->testAttribute(Qt::WA_TranslucentBackground))
+        return d->createDefaultWindowSurface_sys();
+#endif
     return new QVGWindowSurface(widget);
 }