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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 <QMultiHash>
55#include <QObject>
56#include <private/qopenglcontext_p.h>
57#include <QtCore/qmutex.h>
58#include <QGradient>
59#include <qrgba64.h>
60
61QT_BEGIN_NAMESPACE
62
63class QOpenGL2GradientCache : public QOpenGLSharedResource
64{
65 struct CacheInfo
66 {
67 inline CacheInfo(QGradientStops s, qreal op, QGradient::InterpolationMode mode) :
68 stops(std::move(s)), opacity(op), interpolationMode(mode) {}
69
70 GLuint texId;
71 QGradientStops stops;
72 qreal opacity;
73 QGradient::InterpolationMode interpolationMode;
74 };
75
76 typedef QMultiHash<quint64, CacheInfo> QOpenGLGradientColorTableHash;
77
78public:
79 static QOpenGL2GradientCache *cacheForContext(QOpenGLContext *context);
80
81 QOpenGL2GradientCache(QOpenGLContext *);
82 ~QOpenGL2GradientCache();
83
84 GLuint getBuffer(const QGradient &gradient, qreal opacity);
85 inline int paletteSize() const { return 1024; }
86
87 void invalidateResource() override;
88 void freeResource(QOpenGLContext *ctx) override;
89
90private:
91 inline int maxCacheSize() const { return 60; }
92 inline void generateGradientColorTable(const QGradient& gradient,
93 QRgba64 *colorTable,
94 int size, qreal opacity) const;
95 inline void generateGradientColorTable(const QGradient& gradient,
96 uint *colorTable,
97 int size, qreal opacity) const;
98 GLuint addCacheElement(quint64 hash_val, const QGradient &gradient, qreal opacity);
99 void cleanCache();
100
101 QOpenGLGradientColorTableHash cache;
102 QMutex m_mutex;
103};
104
105QT_END_NAMESPACE
106
107#endif // QOPENGLGRADIENTCACHE_P_H
108