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39
40#ifndef QSGRHIDISTANCEFIELDGLYPHCACHE_H
41#define QSGRHIDISTANCEFIELDGLYPHCACHE_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 "qsgadaptationlayer_p.h"
55#include <private/qsgareaallocator_p.h>
56#include <QtGui/private/qrhi_p.h>
57
58QT_BEGIN_NAMESPACE
59
60class Q_QUICK_PRIVATE_EXPORT QSGRhiDistanceFieldGlyphCache : public QSGDistanceFieldGlyphCache
61{
62public:
63 QSGRhiDistanceFieldGlyphCache(QRhi *rhi, const QRawFont &font);
64 virtual ~QSGRhiDistanceFieldGlyphCache();
65
66 void requestGlyphs(const QSet<glyph_t> &glyphs) override;
67 void storeGlyphs(const QList<QDistanceField> &glyphs) override;
68 void referenceGlyphs(const QSet<glyph_t> &glyphs) override;
69 void releaseGlyphs(const QSet<glyph_t> &glyphs) override;
70
71 bool useTextureResizeWorkaround() const;
72 bool createFullSizeTextures() const;
73 int maxTextureSize() const;
74
75 void setMaxTextureCount(int max) { m_maxTextureCount = max; }
76 int maxTextureCount() const { return m_maxTextureCount; }
77
78 void commitResourceUpdates(QRhiResourceUpdateBatch *mergeInto);
79
80 bool eightBitFormatIsAlphaSwizzled() const override;
81
82private:
83 bool loadPregeneratedCache(const QRawFont &font);
84
85 struct TextureInfo {
86 QRhiTexture *texture;
87 QSize size;
88 QRect allocatedArea;
89 QDistanceField image;
90 int padding = -1;
91 QVector<QRhiTextureUploadEntry> uploads;
92
93 TextureInfo(const QRect &preallocRect = QRect()) : texture(nullptr), allocatedArea(preallocRect) { }
94 };
95
96 void createTexture(TextureInfo *texInfo, int width, int height, const void *pixels);
97 void createTexture(TextureInfo *texInfo, int width, int height);
98 void resizeTexture(TextureInfo *texInfo, int width, int height);
99
100 TextureInfo *textureInfo(int index)
101 {
102 for (int i = m_textures.count(); i <= index; ++i) {
103 if (createFullSizeTextures())
104 m_textures.append(QRect(0, 0, maxTextureSize(), maxTextureSize()));
105 else
106 m_textures.append(TextureInfo());
107 }
108
109 return &m_textures[index];
110 }
111
112 QRhi *m_rhi;
113 mutable int m_maxTextureSize = 0;
114 int m_maxTextureCount = 3;
115 QSGAreaAllocator *m_areaAllocator = nullptr;
116 QRhiResourceUpdateBatch *m_resourceUpdates = nullptr;
117 QList<TextureInfo> m_textures;
118 QHash<glyph_t, TextureInfo *> m_glyphsTexture;
119 QSet<glyph_t> m_unusedGlyphs;
120 QSet<QRhiTexture *> m_pendingDispose;
121};
122
123QT_END_NAMESPACE
124
125#endif // QSGRHIDISTANCEFIELDGLYPHCACHE_H
126