From 9672bec709bb8ee3d35dcd889b218708e4804c55 Mon Sep 17 00:00:00 2001
From: Laszlo Agocs <laszlo.p.agocs@nokia.com>
Date: Fri, 15 Apr 2011 09:05:31 +0200
Subject: Make EGL surface transparency working on Symbian.

When the hardware is capable enough, setting WA_TranslucentBackground
will not lead to falling back to raster, but will continue using
OpenVG or OpenGL based rendering. However this needs an alpha channel
which was not requested previously. This patch corrects it.

Task-number: QT-4729
Reviewed-by: Jani Hautakangas
---
 src/gui/egl/qegl_symbian.cpp | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/gui/egl/qegl_symbian.cpp b/src/gui/egl/qegl_symbian.cpp
index 6533d11..fabf9d1 100644
--- a/src/gui/egl/qegl_symbian.cpp
+++ b/src/gui/egl/qegl_symbian.cpp
@@ -42,6 +42,7 @@
 #include <QtGui/qpaintdevice.h>
 #include <QtGui/qpixmap.h>
 #include <QtGui/qwidget.h>
+#include <QtGui/private/qapplication_p.h>
 
 #include "qegl_p.h"
 #include "qeglcontext_p.h"
@@ -73,10 +74,14 @@ void QEglProperties::setPaintDeviceFormat(QPaintDevice *dev)
         return;
 
     int devType = dev->devType();
-    if (devType == QInternal::Image)
+    if (devType == QInternal::Image) {
         setPixelFormat(static_cast<QImage *>(dev)->format());
-    else
-        setPixelFormat(QImage::Format_RGB32);
+    } else {
+        QImage::Format format = QImage::Format_RGB32;
+        if (QApplicationPrivate::instance() && QApplicationPrivate::instance()->useTranslucentEGLSurfaces)
+            format = QImage::Format_ARGB32_Premultiplied;
+        setPixelFormat(format);
+    }
 }
 
 
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