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diff --git a/src/gui/kernel/qpaintdevicewindow_p.h b/src/gui/kernel/qpaintdevicewindow_p.h
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+++ b/src/gui/kernel/qpaintdevicewindow_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtGui 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 QPAINTDEVICEWINDOW_P_H
+#define QPAINTDEVICEWINDOW_P_H
+
+#include <QtGui/QPaintDeviceWindow>
+#include <QtCore/QCoreApplication>
+#include <QtGui/private/qwindow_p.h>
+#include <QtGui/QPaintEvent>
+
+QT_BEGIN_NAMESPACE
+
+class Q_GUI_EXPORT QPaintDeviceWindowPrivate : public QWindowPrivate
+{
+    Q_DECLARE_PUBLIC(QPaintDeviceWindow)
+
+public:
+    QPaintDeviceWindowPrivate() : paintEventSent(false) { }
+
+    virtual void beginPaint(const QRegion &region)
+    {
+        Q_UNUSED(region);
+    }
+
+    virtual void endPaint()
+    {
+    }
+
+    virtual void flush(const QRegion &region)
+    {
+        Q_UNUSED(region);
+    }
+
+    bool paint(const QRegion &region)
+    {
+        Q_Q(QPaintDeviceWindow);
+        QRegion toPaint = region & dirtyRegion;
+        if (toPaint.isEmpty())
+            return false;
+
+        // Clear the region now. The overridden functions may call update().
+        dirtyRegion -= toPaint;
+
+        beginPaint(toPaint);
+
+        QPaintEvent paintEvent(toPaint);
+        q->paintEvent(&paintEvent);
+
+        endPaint();
+
+        return true;
+    }
+
+    void triggerUpdate()
+    {
+        Q_Q(QPaintDeviceWindow);
+        if (!paintEventSent) {
+            QCoreApplication::postEvent(q, new QEvent(QEvent::UpdateRequest));
+            paintEventSent = true;
+        }
+    }
+
+    void doFlush(const QRegion &region)
+    {
+        QRegion toFlush = region;
+        if (paint(toFlush))
+            flush(toFlush);
+    }
+
+    void handleUpdateEvent()
+    {
+        if (dirtyRegion.isEmpty())
+            return;
+        doFlush(dirtyRegion);
+    }
+
+    void markWindowAsDirty()
+    {
+        Q_Q(QPaintDeviceWindow);
+        dirtyRegion += QRect(QPoint(0, 0), q->size());
+    }
+
+private:
+    QRegion dirtyRegion;
+    bool paintEventSent;
+};
+
+
+QT_END_NAMESPACE
+
+#endif //QPAINTDEVICEWINDOW_P_H