Introduce platform extension to QGraphicsSystem

Qt on Symbian needs some special capabilities to be able
to work on 32MB GPU. This patch introduces some Symbian
specific functions to QGraphicsSystem

Task-number: QTBUG-17882
Reviewed-by: Laszlo Agocs

6 files changed, 247 insertions, 5 deletions

diff --git a/src/gui/painting/painting.pri b/src/gui/painting/painting.pri
index bd37d9f..b3b647a 100644
--- a/src/gui/painting/painting.pri
+++ b/src/gui/painting/painting.pri
@@ -9,6 +9,7 @@ HEADERS += \
         painting/qdrawutil.h \
         painting/qemulationpaintengine_p.h \
         painting/qgraphicssystem_p.h \
+        painting/qgraphicssystemex_p.h \
         painting/qmatrix.h \
         painting/qmemrotate_p.h \
         painting/qoutlinemapper_p.h \
@@ -235,8 +236,10 @@ embedded {
 
 symbian {
         HEADERS += painting/qwindowsurface_s60_p.h \
-                    painting/qdrawhelper_arm_simd_p.h
-        SOURCES += painting/qwindowsurface_s60.cpp
+                    painting/qdrawhelper_arm_simd_p.h \
+                    painting/qgraphicssystemex_symbian_p.h
+        SOURCES += painting/qwindowsurface_s60.cpp \
+                    painting/qgraphicssystemex_symbian.cpp
         armccIfdefBlock = \
         "$${LITERAL_HASH}if defined(ARMV6)" \
         "MACRO QT_HAVE_ARM_SIMD" \
diff --git a/src/gui/painting/qgraphicssystem.cpp b/src/gui/painting/qgraphicssystem.cpp
index 5112019..4b79600 100644
--- a/src/gui/painting/qgraphicssystem.cpp
+++ b/src/gui/painting/qgraphicssystem.cpp
@@ -52,6 +52,9 @@
 #endif
 #ifdef Q_OS_SYMBIAN
 # include <private/qpixmap_s60_p.h>
+# include <private/qgraphicssystemex_symbian_p.h>
+#else
+# include <private/qgraphicssystemex_p.h>
 #endif
 
 QT_BEGIN_NAMESPACE
@@ -84,9 +87,18 @@ QPixmapData *QGraphicsSystem::createPixmapData(QPixmapData *origin)
     return createPixmapData(origin->pixelType());
 }
 
-void QGraphicsSystem::releaseCachedResources()
+#ifdef Q_OS_SYMBIAN
+Q_GLOBAL_STATIC(QSymbianGraphicsSystemEx, symbianPlatformExtension)
+#endif
+
+QGraphicsSystemEx* QGraphicsSystem::platformExtension()
 {
-    // Do nothing here
+#ifdef Q_OS_SYMBIAN
+    // this is used on raster graphics systems. HW accelerated
+    // graphics systems will overwrite this function.
+    return symbianPlatformExtension();
+#endif
+    return 0;
 }
 
 QT_END_NAMESPACE
diff --git a/src/gui/painting/qgraphicssystem_p.h b/src/gui/painting/qgraphicssystem_p.h
index 80e8959..d5acaa4 100644
--- a/src/gui/painting/qgraphicssystem_p.h
+++ b/src/gui/painting/qgraphicssystem_p.h
@@ -59,6 +59,7 @@
 QT_BEGIN_NAMESPACE
 
 class QPixmapFilter;
+class QGraphicsSystemEx;
 
 class Q_GUI_EXPORT QGraphicsSystem
 {
@@ -73,7 +74,7 @@ public:
     //    to have a graphics system.
     static QPixmapData *createDefaultPixmapData(QPixmapData::PixelType type);
 
-    virtual void releaseCachedResources();
+    virtual QGraphicsSystemEx* platformExtension();
 };
 
 QT_END_NAMESPACE
diff --git a/src/gui/painting/qgraphicssystemex_p.h b/src/gui/painting/qgraphicssystemex_p.h
new file mode 100644
index 0000000..6feb116
--- /dev/null
+++ b/src/gui/painting/qgraphicssystemex_p.h
@@ -0,0 +1,66 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGRAPHICSSYSTEMEX_P_H
+#define QGRAPHICSSYSTEMEX_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <qglobal.h>
+
+QT_BEGIN_NAMESPACE
+
+class Q_GUI_EXPORT QGraphicsSystemEx
+{
+};
+
+QT_END_NAMESPACE
+
+#endif
diff --git a/src/gui/painting/qgraphicssystemex_symbian.cpp b/src/gui/painting/qgraphicssystemex_symbian.cpp
new file mode 100644
index 0000000..54d21ac
--- /dev/null
+++ b/src/gui/painting/qgraphicssystemex_symbian.cpp
@@ -0,0 +1,87 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qgraphicssystemex_symbian_p.h"
+#include "private/qwidget_p.h"
+#include "private/qbackingstore_p.h"
+#include "private/qapplication_p.h"
+#include "qwidget_p.h"
+
+#include <QDebug>
+
+QT_BEGIN_NAMESPACE
+
+void QSymbianGraphicsSystemEx::releaseCachedGpuResources()
+{
+    // Do nothing here
+    // This is implemented in graphics system specific plugin
+}
+
+void QSymbianGraphicsSystemEx::releaseAllGpuResources()
+{
+    releaseCachedGpuResources();
+
+    foreach (QWidget *widget, QApplication::topLevelWidgets()) {
+        if (QTLWExtra *topExtra = qt_widget_private(widget)->maybeTopData())
+            topExtra->backingStore.destroy();
+    }
+}
+
+bool QSymbianGraphicsSystemEx::hasBCM2727()
+{
+    return !QApplicationPrivate::instance()->useTranslucentEGLSurfaces;
+}
+
+void QSymbianGraphicsSystemEx::forceToRaster(QWidget *window)
+{
+    if (window && window->isWindow()) {
+        qt_widget_private(window)->createTLExtra();
+        if (QTLWExtra *topExtra = qt_widget_private(window)->maybeTopData()) {
+            topExtra->forcedToRaster = 1;
+            if (topExtra->backingStore.data()) {
+                topExtra->backingStore.create(window);
+                topExtra->backingStore.registerWidget(window);
+            }
+        }
+    }
+}
+
+QT_END_NAMESPACE
diff --git a/src/gui/painting/qgraphicssystemex_symbian_p.h b/src/gui/painting/qgraphicssystemex_symbian_p.h
new file mode 100644
index 0000000..0b1e39e
--- /dev/null
+++ b/src/gui/painting/qgraphicssystemex_symbian_p.h
@@ -0,0 +1,73 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QSYMBIANGRAPHICSSYSTEMEX_P_H
+#define QSYMBIANGRAPHICSSYSTEMEX_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "private/qgraphicssystemex_p.h"
+
+QT_BEGIN_NAMESPACE
+
+class QWidget;
+
+class Q_GUI_EXPORT QSymbianGraphicsSystemEx : public QGraphicsSystemEx
+{
+public:
+    virtual void releaseCachedGpuResources();
+    virtual void releaseAllGpuResources();
+    virtual bool hasBCM2727();
+    virtual void forceToRaster(QWidget *window);
+};
+
+QT_END_NAMESPACE
+
+#endif