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39
40#ifndef QSGOPENGLDISTANCEFIELDGLYPHCACHE_H
41#define QSGOPENGLDISTANCEFIELDGLYPHCACHE_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 <QtGui/qopenglfunctions.h>
56#include <qopenglshaderprogram.h>
57#include <qopenglbuffer.h>
58#include <qopenglvertexarrayobject.h>
59#include <QtGui/private/qopenglengineshadersource_p.h>
60#include <private/qsgareaallocator_p.h>
61
62QT_BEGIN_NAMESPACE
63
64class QOpenGLSharedResourceGuard;
65#if !defined(QT_OPENGL_ES_2)
66class QOpenGLFunctions_3_2_Core;
67#endif
68
69class Q_QUICK_PRIVATE_EXPORT QSGOpenGLDistanceFieldGlyphCache : public QSGDistanceFieldGlyphCache
70{
71public:
72 QSGOpenGLDistanceFieldGlyphCache(QOpenGLContext *c, const QRawFont &font);
73 virtual ~QSGOpenGLDistanceFieldGlyphCache();
74
75 void requestGlyphs(const QSet<glyph_t> &glyphs) override;
76 void storeGlyphs(const QList<QDistanceField> &glyphs) override;
77 void referenceGlyphs(const QSet<glyph_t> &glyphs) override;
78 void releaseGlyphs(const QSet<glyph_t> &glyphs) override;
79
80 bool useTextureResizeWorkaround() const;
81 bool useTextureUploadWorkaround() const;
82 bool createFullSizeTextures() const;
83
84 void setMaxTextureCount(int max) { m_maxTextureCount = max; }
85 int maxTextureCount() const { return m_maxTextureCount; }
86
87 bool eightBitFormatIsAlphaSwizzled() const override { return !m_coreProfile; }
88
89private:
90 bool loadPregeneratedCache(const QRawFont &font);
91 inline bool isCoreProfile() const { return m_coreProfile; }
92
93 struct TextureInfo {
94 GLuint texture;
95 QSize size;
96 QRect allocatedArea;
97 QDistanceField image;
98 int padding = -1;
99
100 TextureInfo(const QRect &preallocRect = QRect(0, 0, 1, 1)) : texture(0), allocatedArea(preallocRect) { }
101 };
102
103 void createTexture(TextureInfo * texInfo, int width, int height, const void *pixels);
104 void createTexture(TextureInfo * texInfo, int width, int height);
105 void resizeTexture(TextureInfo * texInfo, int width, int height);
106
107 TextureInfo *textureInfo(int index)
108 {
109 Q_ASSERT(m_maxTextureWidth > 0 && m_maxTextureHeight > 0);
110 for (int i = m_textures.count(); i <= index; ++i) {
111 if (createFullSizeTextures())
112 m_textures.append(QRect(0, 0, m_maxTextureWidth, m_maxTextureWidth));
113 else
114 m_textures.append(TextureInfo());
115 }
116
117 return &m_textures[index];
118 }
119
120 void createBlitProgram()
121 {
122 m_blitProgram = new QOpenGLShaderProgram;
123 {
124 const QString source = QLatin1String(qopenglslMainWithTexCoordsVertexShader)
125 + QLatin1String(qopenglslUntransformedPositionVertexShader);
126
127 m_blitProgram->addCacheableShaderFromSourceCode(QOpenGLShader::Vertex, source);
128 }
129 {
130 const QString source = QLatin1String(qopenglslMainFragmentShader)
131 + QLatin1String(qopenglslImageSrcFragmentShader);
132
133 m_blitProgram->addCacheableShaderFromSourceCode(QOpenGLShader::Fragment, source);
134 }
135 m_blitProgram->bindAttributeLocation("vertexCoordsArray", QT_VERTEX_COORDS_ATTR);
136 m_blitProgram->bindAttributeLocation("textureCoordArray", QT_TEXTURE_COORDS_ATTR);
137 m_blitProgram->link();
138 }
139
140 int m_maxTextureWidth;
141 int m_maxTextureHeight;
142 int m_maxTextureCount;
143 bool m_coreProfile;
144
145 QList<TextureInfo> m_textures;
146 QHash<glyph_t, TextureInfo *> m_glyphsTexture;
147 QSet<glyph_t> m_unusedGlyphs;
148
149 QSGAreaAllocator *m_areaAllocator;
150
151 QOpenGLShaderProgram *m_blitProgram;
152 QOpenGLBuffer m_blitBuffer;
153 QOpenGLVertexArrayObject m_vao;
154
155 QOpenGLSharedResourceGuard *m_fboGuard;
156 QOpenGLFunctions *m_funcs;
157#if !defined(QT_OPENGL_ES_2)
158 QOpenGLFunctions_3_2_Core *m_coreFuncs;
159#endif
160};
161
162QT_END_NAMESPACE
163
164#endif // QSGOPENGLDISTANCEFIELDGLYPHCACHE_H
165