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diff --git a/src/quick/scenegraph/qsgthreadedrenderloop_p.h b/src/quick/scenegraph/qsgthreadedrenderloop_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtQml module 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
+** 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, 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.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QSGTHREADEDRENDERLOOP_P_H
+#define QSGTHREADEDRENDERLOOP_P_H
+
+#include <QtCore/QThread>
+#include <QtGui/QOpenGLContext>
+#include <private/qsgcontext_p.h>
+
+#include "qsgrenderloop_p.h"
+
+QT_BEGIN_NAMESPACE
+
+class QSGRenderThread;
+
+class QSGThreadedRenderLoop : public QObject, public QSGRenderLoop
+{
+    Q_OBJECT
+public:
+    QSGThreadedRenderLoop();
+
+    void show(QQuickWindow *window);
+    void hide(QQuickWindow *window);
+
+    void windowDestroyed(QQuickWindow *window);
+    void exposureChanged(QQuickWindow *window);
+
+    void handleExposure(QQuickWindow *window);
+    void handleObscurity(QQuickWindow *window);
+
+    QImage grab(QQuickWindow *);
+
+    void resize(QQuickWindow *, const QSize &);
+
+    void update(QQuickWindow *window);
+    void maybeUpdate(QQuickWindow *window);
+    QSGContext *sceneGraphContext() const;
+
+    QAnimationDriver *animationDriver() const;
+
+    void releaseResources(QQuickWindow *window) { releaseResources(window, false); }
+
+    bool event(QEvent *);
+
+    void wakeup();
+
+public slots:
+    void animationStarted();
+    void animationStopped();
+
+private:
+    friend class QSGRenderThread;
+
+    void releaseResources(QQuickWindow *window, bool inDestructor);
+    bool checkAndResetForceUpdate(QQuickWindow *window);
+
+    bool anyoneShowing();
+    void initialize();
+
+    void maybePostPolishRequest();
+
+    void waitForReleaseComplete();
+
+    void polishAndSync();
+
+    struct Window {
+        QQuickWindow *window;
+    };
+
+    QSGRenderThread *m_thread;
+    QAnimationDriver *m_animation_driver;
+    QList<Window> m_windows;
+
+    int m_animation_timer;
+    int m_update_timer;
+    int m_exhaust_delay;
+
+    bool m_sync_triggered_update;
+};
+
+
+
+QT_END_NAMESPACE
+
+#endif // QSGTHREADEDRENDERLOOP_P_H