From fb4629e766e587a32aad7f1e6862d426c23441d6 Mon Sep 17 00:00:00 2001
From: Jani Hautakangas <jani.hautakangas@nokia.com>
Date: Mon, 10 Jan 2011 13:22:15 +0200
Subject: Setting WA_TranslucentBackground after winid() is ineffective on
 Symbian.

Currently Symbian doesn't support semi-transparent EGL surfaces.
WA_TranslucentBackground attribute is ineffective if set after EGL
surface creation. To enable translucency in this case we need to
recreate backing store to get raster surface which supports translucency.

Task-number: QT-4416
Reviewed-by: Jason Barron
(cherry picked from commit d62e9f4a6fe199ae790b1561fd4ba9ea84bd4d1e)
---
 src/gui/kernel/qwidget_s60.cpp                            | 8 ++++++++
 src/gui/painting/qgraphicssystem_runtime.cpp              | 3 ++-
 src/plugins/graphicssystems/openvg/qgraphicssystem_vg.cpp | 2 ++
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/gui/kernel/qwidget_s60.cpp b/src/gui/kernel/qwidget_s60.cpp
index 7f8fec7..8e4e99a 100644
--- a/src/gui/kernel/qwidget_s60.cpp
+++ b/src/gui/kernel/qwidget_s60.cpp
@@ -780,6 +780,14 @@ void QWidgetPrivate::s60UpdateIsOpaque()
         if (window->SetTransparencyAlphaChannel() == KErrNone) {
             window->SetBackgroundColor(TRgb(255, 255, 255, 0));
             extra->topextra->nativeWindowTransparencyEnabled = 1;
+
+            if (extra->topextra->backingStore.data() &&
+                    QApplicationPrivate::graphics_system_name == QLatin1String("openvg")) {
+                // Semi-transparent EGL surfaces aren't supported. We need to
+                // recreate backing store to get translucent surface (raster surface).
+                extra->topextra->backingStore.create(q);
+                extra->topextra->backingStore.registerWidget(q);
+            }
         }
     } else if (extra->topextra->nativeWindowTransparencyEnabled) {
         window->SetTransparentRegion(TRegionFix<1>());
diff --git a/src/gui/painting/qgraphicssystem_runtime.cpp b/src/gui/painting/qgraphicssystem_runtime.cpp
index a5aa580..0294c4b 100644
--- a/src/gui/painting/qgraphicssystem_runtime.cpp
+++ b/src/gui/painting/qgraphicssystem_runtime.cpp
@@ -322,7 +322,6 @@ QRuntimeGraphicsSystem::QRuntimeGraphicsSystem()
     : m_windowSurfaceDestroyPolicy(DestroyImmediately),
       m_graphicsSystem(0)
 {
-    QApplicationPrivate::graphics_system_name = QLatin1String("runtime");
     QApplicationPrivate::runtime_graphics_system = true;
 
 #ifdef QT_DEFAULT_RUNTIME_SYSTEM
@@ -336,6 +335,8 @@ QRuntimeGraphicsSystem::QRuntimeGraphicsSystem()
 #endif
 
     m_graphicsSystem = QGraphicsSystemFactory::create(m_graphicsSystemName);
+
+    QApplicationPrivate::graphics_system_name = QLatin1String("runtime");
 }
 
 
diff --git a/src/plugins/graphicssystems/openvg/qgraphicssystem_vg.cpp b/src/plugins/graphicssystems/openvg/qgraphicssystem_vg.cpp
index 5b1b595..0c107b5 100644
--- a/src/plugins/graphicssystems/openvg/qgraphicssystem_vg.cpp
+++ b/src/plugins/graphicssystems/openvg/qgraphicssystem_vg.cpp
@@ -45,11 +45,13 @@
 #if defined(Q_OS_SYMBIAN) && !defined(Q_SYMBIAN_SEMITRANSPARENT_BG_SURFACE)
 #include <QtGui/private/qwidget_p.h>
 #endif
+#include <QtGui/private/qapplication_p.h>
 
 QT_BEGIN_NAMESPACE
 
 QVGGraphicsSystem::QVGGraphicsSystem()
 {
+    QApplicationPrivate::graphics_system_name = QLatin1String("openvg");
 }
 
 QPixmapData *QVGGraphicsSystem::createPixmapData(QPixmapData::PixelType type) const
-- 
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