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diff --git a/src/opengl/qopenglgradientcache_p.h b/src/opengl/qopenglgradientcache_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtOpenGL 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 The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/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 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QOPENGLGRADIENTCACHE_P_H
+#define QOPENGLGRADIENTCACHE_P_H
+
+//
+//  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 <private/qopenglcontext_p.h>
+#include <QtCore/qmutex.h>
+#include <QGradient>
+#include <qrgba64.h>
+
+QT_BEGIN_NAMESPACE
+
+class QOpenGL2GradientCache : public QOpenGLSharedResource
+{
+    struct CacheInfo
+    {
+        inline CacheInfo(QGradientStops s, qreal op, QGradient::InterpolationMode mode) :
+            stops(std::move(s)), opacity(op), interpolationMode(mode) {}
+
+        GLuint texId;
+        QGradientStops stops;
+        qreal opacity;
+        QGradient::InterpolationMode interpolationMode;
+    };
+
+    typedef QMultiHash<quint64, CacheInfo> QOpenGLGradientColorTableHash;
+
+public:
+    static QOpenGL2GradientCache *cacheForContext(QOpenGLContext *context);
+
+    QOpenGL2GradientCache(QOpenGLContext *);
+    ~QOpenGL2GradientCache();
+
+    GLuint getBuffer(const QGradient &gradient, qreal opacity);
+    inline int paletteSize() const { return 1024; }
+
+    void invalidateResource() override;
+    void freeResource(QOpenGLContext *ctx) override;
+
+private:
+    inline int maxCacheSize() const { return 60; }
+    inline void generateGradientColorTable(const QGradient& gradient,
+                                           QRgba64 *colorTable,
+                                           int size, qreal opacity) const;
+    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();
+
+    QOpenGLGradientColorTableHash cache;
+    QMutex m_mutex;
+};
+
+QT_END_NAMESPACE
+
+#endif // QOPENGLGRADIENTCACHE_P_H