Long live Qt 4.5!

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diff --git a/src/gui/painting/qpaintengine_p.h b/src/gui/painting/qpaintengine_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QPAINTENGINE_P_H
+#define QPAINTENGINE_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of other Qt classes.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "QtGui/qpainter.h"
+#include "QtGui/qpaintengine.h"
+#include "QtGui/qregion.h"
+#include "private/qobject_p.h"
+
+QT_BEGIN_NAMESPACE
+
+class QPaintDevice;
+
+class QPaintEnginePrivate
+{
+    Q_DECLARE_PUBLIC(QPaintEngine)
+public:
+    QPaintEnginePrivate() : pdev(0), q_ptr(0), currentClipWidget(0), hasSystemTransform(0),
+                            hasSystemViewport(0) {}
+    virtual ~QPaintEnginePrivate() { }
+    QPaintDevice *pdev;
+    QPaintEngine *q_ptr;
+    QRegion systemClip;
+    QRegion systemViewport;
+    QTransform systemTransform;
+    QWidget *currentClipWidget;
+    uint hasSystemTransform : 1;
+    uint hasSystemViewport : 1;
+
+    inline void transformSystemClip()
+    {
+        if (systemClip.isEmpty())
+            return;
+
+        if (systemTransform.type() <= QTransform::TxTranslate)
+            systemClip.translate(qRound(systemTransform.dx()), qRound(systemTransform.dy()));
+        else
+            systemClip = systemTransform.map(systemClip);
+
+        // Make sure we're inside the viewport.
+        if (hasSystemViewport) {
+            systemClip &= systemViewport;
+            if (systemClip.isEmpty()) {
+                // We don't want to paint without system clip, so set it to 1 pixel :)
+                systemClip = QRect(systemViewport.boundingRect().topLeft(), QSize(1, 1));
+            }
+        }
+    }
+
+    inline void setSystemTransform(const QTransform &xform)
+    {
+        systemTransform = xform;
+        if ((hasSystemTransform = !xform.isIdentity()))
+            transformSystemClip();
+        systemStateChanged();
+    }
+
+    inline void setSystemViewport(const QRegion &region)
+    {
+        systemViewport = region;
+        hasSystemViewport = !systemViewport.isEmpty();
+    }
+
+    virtual void systemStateChanged() { }
+
+    void drawBoxTextItem(const QPointF &p, const QTextItemInt &ti);
+
+private:
+    QRect systemRect;
+};
+
+QT_END_NAMESPACE
+
+#endif // QPAINTENGINE_P_H