1 /**************************************************************************** 2 ** 3 ** Copyright (C) 2015 The Qt Company Ltd. 4 ** Contact: http://www.qt.io/licensing/ 5 ** 6 ** This file is part of the QtOpenGL module of the Qt Toolkit. 7 ** 8 ** $QT_BEGIN_LICENSE:LGPL$ 9 ** Commercial License Usage 10 ** Licensees holding valid commercial Qt licenses may use this file in 11 ** accordance with the commercial license agreement provided with the 12 ** Software or, alternatively, in accordance with the terms contained in 13 ** a written agreement between you and The Qt Company. For licensing terms 14 ** and conditions see http://www.qt.io/terms-conditions. For further 15 ** information use the contact form at http://www.qt.io/contact-us. 16 ** 17 ** GNU Lesser General Public License Usage 18 ** Alternatively, this file may be used under the terms of the GNU Lesser 19 ** General Public License version 2.1 or version 3 as published by the Free 20 ** Software Foundation and appearing in the file LICENSE.LGPLv21 and 21 ** LICENSE.LGPLv3 included in the packaging of this file. Please review the 22 ** following information to ensure the GNU Lesser General Public License 23 ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and 24 ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. 25 ** 26 ** As a special exception, The Qt Company gives you certain additional 27 ** rights. These rights are described in The Qt Company LGPL Exception 28 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. 29 ** 30 ** GNU General Public License Usage 31 ** Alternatively, this file may be used under the terms of the GNU 32 ** General Public License version 3.0 as published by the Free Software 33 ** Foundation and appearing in the file LICENSE.GPL included in the 34 ** packaging of this file. Please review the following information to 35 ** ensure the GNU General Public License version 3.0 requirements will be 36 ** met: http://www.gnu.org/copyleft/gpl.html. 37 ** 38 ** $QT_END_LICENSE$ 39 ** 40 ****************************************************************************/ 41 42 // 43 // W A R N I N G 44 // ------------- 45 // 46 // This file is not part of the Qt API. It exists purely as an 47 // implementation detail. This header file may change from version to 48 // version without notice, or even be removed. 49 // 50 // We mean it. 51 // 52 53 #include <QMultiHash> 54 #include <QObject> 55 #include <QtOpenGL/QtOpenGL> 56 #include <private/qgl_p.h> 57 #include <QtCore/qmutex.h> 58 59 QT_BEGIN_NAMESPACE 60 61 class QGL2GradientCache 62 { 63 struct CacheInfo 64 { CacheInfoCacheInfo65 inline CacheInfo(QGradientStops s, qreal op, QGradient::InterpolationMode mode) : 66 stops(s), opacity(op), interpolationMode(mode) {} 67 68 GLuint texId; 69 QGradientStops stops; 70 qreal opacity; 71 QGradient::InterpolationMode interpolationMode; 72 }; 73 74 typedef QMultiHash<quint64, CacheInfo> QGLGradientColorTableHash; 75 76 public: 77 static QGL2GradientCache *cacheForContext(const QGLContext *context); 78 QGL2GradientCache(const QGLContext *)79 QGL2GradientCache(const QGLContext *) {} ~QGL2GradientCache()80 ~QGL2GradientCache() { cleanCache(); } 81 82 GLuint getBuffer(const QGradient &gradient, qreal opacity); paletteSize()83 inline int paletteSize() const { return 1024; } 84 85 private: maxCacheSize()86 inline int maxCacheSize() const { return 60; } 87 inline void generateGradientColorTable(const QGradient& gradient, 88 uint *colorTable, 89 int size, qreal opacity) const; 90 GLuint addCacheElement(quint64 hash_val, const QGradient &gradient, qreal opacity); 91 void cleanCache(); 92 93 QGLGradientColorTableHash cache; 94 QMutex m_mutex; 95 }; 96 97 QT_END_NAMESPACE 98 99