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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.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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.
**
** 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.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
//
// 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/QtOpenGL>
#include <private/qgl_p.h>
#include <QtCore/qmutex.h>
QT_BEGIN_NAMESPACE
class QGL2GradientCache : public QOpenGLSharedResource
{
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:
static QGL2GradientCache *cacheForContext(const QGLContext *context);
QGL2GradientCache(QOpenGLContext *);
~QGL2GradientCache();
GLuint getBuffer(const QGradient &gradient, qreal opacity);
inline int paletteSize() const { return 1024; }
void invalidateResource();
void freeResource(QOpenGLContext *ctx);
private:
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;
QMutex m_mutex;
};
QT_END_NAMESPACE
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