Long live Qt 4.5!

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diff --git a/src/opengl/gl2paintengineex/qglgradientcache_p.h b/src/opengl/gl2paintengineex/qglgradientcache_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 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 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.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QMultiHash>
+#include <QObject>
+#include <QtOpenGL>
+
+class QGLGradientCache : public QObject
+{
+    Q_OBJECT
+    struct CacheInfo
+    {
+        inline CacheInfo(QGradientStops s, qreal op, QGradient::InterpolationMode mode) :
+            stops(s), opacity(op), interpolationMode(mode) {}
+
+        GLuint texId;
+        QGradientStops stops;
+        qreal opacity;
+        QGradient::InterpolationMode interpolationMode;
+    };
+
+    typedef QMultiHash<quint64, CacheInfo> QGLGradientColorTableHash;
+
+public:
+    QGLGradientCache() : QObject(), buffer_ctx(0)
+    {
+/*
+        connect(QGLSignalProxy::instance(),
+                SIGNAL(aboutToDestroyContext(const QGLContext *)),
+                SLOT(cleanupGLContextRefs(const QGLContext *)));
+*/
+    }
+
+    GLuint getBuffer(const QGradient &gradient, qreal opacity, const QGLContext *ctx);
+    inline int paletteSize() const { return 1024; }
+
+protected:
+    inline int maxCacheSize() const { return 60; }
+    inline void generateGradientColorTable(const QGradient& gradient,
+                                           uint *colorTable,
+                                           int size, qreal opacity) const;
+    GLuint addCacheElement(quint64 hash_val, const QGradient &gradient, qreal opacity);
+
+    void cleanCache();
+
+    QGLGradientColorTableHash cache;
+    const QGLContext *buffer_ctx;
+
+public slots:
+    void cleanupGLContextRefs(const QGLContext *context) {
+        if (context == buffer_ctx) {
+            cleanCache();
+            buffer_ctx = 0;
+        }
+    }
+};
+
+
+