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diff --git a/src/quick/scenegraph/qsgwindowsrenderloop_p.h b/src/quick/scenegraph/qsgwindowsrenderloop_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 QSGWINDOWSRENDERLOOP_P_H
+#define QSGWINDOWSRENDERLOOP_P_H
+
+#include <QtCore/QObject>
+#include <QtCore/QElapsedTimer>
+
+#include <QtGui/QOpenGLContext>
+
+#include "qsgrenderloop_p.h"
+
+QT_BEGIN_NAMESPACE
+
+class QSGWindowsRenderLoop : public QSGRenderLoop
+{
+    Q_OBJECT
+public:
+    explicit QSGWindowsRenderLoop();
+
+    void show(QQuickWindow *window);
+    void hide(QQuickWindow *window);
+
+    void windowDestroyed(QQuickWindow *window);
+
+    void exposureChanged(QQuickWindow *window);
+    QImage grab(QQuickWindow *window);
+
+    void update(QQuickWindow *window);
+    void maybeUpdate(QQuickWindow *window);
+
+    QAnimationDriver *animationDriver() const { return m_animationDriver; }
+
+    QSGContext *sceneGraphContext() const { return m_sg; }
+
+    void releaseResources(QQuickWindow *) { }
+
+    void render();
+    void renderWindow(QQuickWindow *window);
+
+    void resize(QQuickWindow *, const QSize &) { }
+
+    bool event(QEvent *event);
+    bool anyoneShowing() const;
+
+    bool interleaveIncubation() const;
+
+public slots:
+    void started();
+    void stopped();
+
+private:
+    struct WindowData {
+        QQuickWindow *window;
+        bool pendingUpdate;
+    };
+
+    void handleObscurity();
+    void maybePostUpdateTimer();
+    WindowData *windowData(QQuickWindow *window);
+
+    QList<WindowData> m_windows;
+
+    QOpenGLContext *m_gl;
+    QSGContext *m_sg;
+
+    QAnimationDriver *m_animationDriver;
+
+    int m_updateTimer;
+    int m_animationTimer;
+
+    int m_vsyncDelta;
+};
+
+QT_END_NAMESPACE
+
+#endif // QSGWINDOWSRENDERLOOP_P_H