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39
40#ifndef QOPENGLGRADIENTCACHE_P_H
41#define QOPENGLGRADIENTCACHE_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists purely as an
48// implementation detail. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include <QtGui/private/qtguiglobal_p.h>
55#include <QMultiHash>
56#include <QObject>
57#include <private/qopenglcontext_p.h>
58#include <QtCore/qmutex.h>
59#include <QGradient>
60#include <qrgba64.h>
61
62QT_BEGIN_NAMESPACE
63
64class QOpenGL2GradientCache : public QOpenGLSharedResource
65{
66 struct CacheInfo
67 {
68 inline CacheInfo(QGradientStops s, qreal op, QGradient::InterpolationMode mode) :
69 stops(std::move(s)), opacity(op), interpolationMode(mode) {}
70
71 GLuint texId;
72 QGradientStops stops;
73 qreal opacity;
74 QGradient::InterpolationMode interpolationMode;
75 };
76
77 typedef QMultiHash<quint64, CacheInfo> QOpenGLGradientColorTableHash;
78
79public:
80 static QOpenGL2GradientCache *cacheForContext(QOpenGLContext *context);
81
82 QOpenGL2GradientCache(QOpenGLContext *);
83 ~QOpenGL2GradientCache();
84
85 GLuint getBuffer(const QGradient &gradient, qreal opacity);
86 inline int paletteSize() const { return 1024; }
87
88 void invalidateResource() override;
89 void freeResource(QOpenGLContext *ctx) override;
90
91private:
92 inline int maxCacheSize() const { return 60; }
93 inline void generateGradientColorTable(const QGradient& gradient,
94 QRgba64 *colorTable,
95 int size, qreal opacity) const;
96 inline void generateGradientColorTable(const QGradient& gradient,
97 uint *colorTable,
98 int size, qreal opacity) const;
99 GLuint addCacheElement(quint64 hash_val, const QGradient &gradient, qreal opacity);
100 void cleanCache();
101
102 QOpenGLGradientColorTableHash cache;
103 QMutex m_mutex;
104};
105
106QT_END_NAMESPACE
107
108#endif // QOPENGLGRADIENTCACHE_P_H
109

source code of qtbase/src/gui/opengl/qopenglgradientcache_p.h