iOS: Implement QIOSBackingStore in terms of a QOpenGLPaintDevice

We build on top of the QPlatformOpenGLContext implementation to get
automatic support for QBackingStore-based painting. Since the OpenGL
renderer does not clear the backingstore between frames, we actually
also get support for partial updates, and we get the benefit of an
accelerated paint engine for Qt Quick 1 without setting a GLWidget
as the viewport, which would cause issues such as an extra QWindow.

This patch also removes the dependency to QtOpenGL and QtWidgets, which
were leftovers from the Qt4 platform plugin. In Qt5 the needed GL bits
are in QtGui.

Change-Id: Id9b736bfb2e4aec56c0fa9f5b7b4d8bff8e3d1dc
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>

1 files changed, 31 insertions, 26 deletions

diff --git a/src/plugins/platforms/ios/qiosbackingstore.h b/src/plugins/platforms/ios/qiosbackingstore.h
index d83a5c21ad..c110f0e4d1 100644
--- a/src/plugins/platforms/ios/qiosbackingstore.h
+++ b/src/plugins/platforms/ios/qiosbackingstore.h
@@ -1,38 +1,38 @@
 /****************************************************************************
 **
-** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
-** Contact: http://www.qt-project.org/
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
 **
 ** This file is part of the plugins of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
 ** GNU Lesser General Public License Usage
-** 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.
+** 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
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
 **
 ** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU General
-** Public License version 3.0 as published by the Free Software Foundation
-** and appearing in the file LICENSE.GPL included in the packaging of this
-** file. Please review the following information to ensure the GNU General
-** Public License version 3.0 requirements will be met:
-** http://www.gnu.org/copyleft/gpl.html.
-**
-** Other Usage
-** Alternatively, this file may be used in accordance with the terms and
-** conditions contained in a signed written agreement between you and Nokia.
-**
-**
-**
-**
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
 **
 **
 ** $QT_END_LICENSE$
@@ -42,7 +42,6 @@
 #ifndef QIOSBACKINGSTORE_H
 #define QIOSBACKINGSTORE_H
 
-#include <qpa/qplatformintegration.h>
 #include <qpa/qplatformbackingstore.h>
 
 QT_BEGIN_NAMESPACE
@@ -51,13 +50,19 @@ class QIOSBackingStore : public QPlatformBackingStore
 {
 public:
     QIOSBackingStore(QWindow *window);
+    ~QIOSBackingStore();
 
     QPaintDevice *paintDevice();
+
+    void beginPaint(const QRegion &);
+    void endPaint();
+
     void flush(QWindow *window, const QRegion &region, const QPoint &offset);
     void resize(const QSize &size, const QRegion &staticContents);
 
 private:
-    QPaintDevice *m_paintDevice;
+    QOpenGLContext *m_context;
+    QPaintDevice *m_device;
 };
 
 QT_END_NAMESPACE