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diff --git a/src/opengl/qwindowsurface_gl_p.h b/src/opengl/qwindowsurface_gl_p.h
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+/****************************************************************************
+**
+** 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 QtOpenGL 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 QWINDOWSURFACE_GL_P_H
+#define QWINDOWSURFACE_GL_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of the QLibrary class.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <qglobal.h>
+#include <qgl.h>
+#include <private/qwindowsurface_p.h>
+#include <private/qglpaintdevice_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class QPaintDevice;
+class QPoint;
+class QRegion;
+class QWidget;
+struct QGLWindowSurfacePrivate;
+
+Q_OPENGL_EXPORT QGLWidget* qt_gl_share_widget();
+Q_OPENGL_EXPORT void qt_destroy_gl_share_widget();
+
+class QGLWindowSurfaceGLPaintDevice : public QGLPaintDevice
+{
+public:
+    QPaintEngine* paintEngine() const;
+    void endPaint();
+    QSize size() const;
+    int metric(PaintDeviceMetric m) const;
+    QGLContext* context() const;
+    QGLWindowSurfacePrivate* d;
+};
+
+class Q_OPENGL_EXPORT QGLWindowSurface : public QObject, public QWindowSurface // , public QPaintDevice
+{
+    Q_OBJECT
+public:
+    QGLWindowSurface(QWidget *window);
+    ~QGLWindowSurface();
+
+    QPaintDevice *paintDevice();
+    void flush(QWidget *widget, const QRegion &region, const QPoint &offset);
+
+#if !defined(Q_WS_QPA)
+    void setGeometry(const QRect &rect);
+#else
+    virtual void resize(const QSize &size);
+#endif
+
+    void updateGeometry();
+    bool scroll(const QRegion &area, int dx, int dy);
+
+    void beginPaint(const QRegion &region);
+    void endPaint(const QRegion &region);
+
+    QImage *buffer(const QWidget *widget);
+
+    WindowSurfaceFeatures features() const;
+
+    QGLContext *context() const;
+
+    static QGLFormat surfaceFormat;
+
+    enum SwapMode { AutomaticSwap, AlwaysFullSwap, AlwaysPartialSwap, KillSwap };
+    static SwapMode swapBehavior;
+
+private slots:
+    void deleted(QObject *object);
+
+private:
+    void hijackWindow(QWidget *widget);
+    bool initializeOffscreenTexture(const QSize &size);
+
+    QGLWindowSurfacePrivate *d_ptr;
+};
+
+QT_END_NAMESPACE
+
+#endif // QWINDOWSURFACE_GL_P_H
+