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39 
40 #ifndef QTEXTUREGLYPHCACHE_GL_P_H
41 #define QTEXTUREGLYPHCACHE_GL_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 <private/qtextureglyphcache_p.h>
55 #include <private/qgl_p.h>
56 #include <qglshaderprogram.h>
57 #include <qglframebufferobject.h>
58 #include <qopenglfunctions.h>
59 
60 // #define QT_GL_TEXTURE_GLYPH_CACHE_DEBUG
61 
62 QT_BEGIN_NAMESPACE
63 
64 class QGL2PaintEngineExPrivate;
65 
66 struct QGLGlyphTexture : public QOpenGLSharedResource
67 {
QGLGlyphTextureQGLGlyphTexture68     QGLGlyphTexture(const QGLContext *ctx)
69         : QOpenGLSharedResource(ctx->contextHandle()->shareGroup())
70         , m_fbo(0)
71         , m_width(0)
72         , m_height(0)
73     {
74         if (ctx && QGLFramebufferObject::hasOpenGLFramebufferObjects() && !ctx->d_ptr->workaround_brokenFBOReadBack)
75             ctx->contextHandle()->functions()->glGenFramebuffers(1, &m_fbo);
76 
77 #ifdef QT_GL_TEXTURE_GLYPH_CACHE_DEBUG
78         qDebug(" -> QGLGlyphTexture() %p for context %p.", this, ctx);
79 #endif
80     }
81 
freeResourceQGLGlyphTexture82     void freeResource(QOpenGLContext *context) override
83     {
84         const QGLContext *ctx = QGLContext::fromOpenGLContext(context);
85 #ifdef QT_GL_TEXTURE_GLYPH_CACHE_DEBUG
86         qDebug("~QGLGlyphTexture() %p for context %p.", this, ctx);
87 #else
88         Q_UNUSED(ctx);
89 #endif
90         if (ctx && m_fbo)
91             ctx->contextHandle()->functions()->glDeleteFramebuffers(1, &m_fbo);
92         if (m_width || m_height)
93             ctx->contextHandle()->functions()->glDeleteTextures(1, &m_texture);
94     }
95 
invalidateResourceQGLGlyphTexture96     void invalidateResource() override
97     {
98         m_texture = 0;
99         m_fbo = 0;
100         m_width = 0;
101         m_height = 0;
102     }
103 
104     GLuint m_texture;
105     GLuint m_fbo;
106     int m_width;
107     int m_height;
108 };
109 
110 class Q_OPENGL_EXPORT QGLTextureGlyphCache : public QImageTextureGlyphCache
111 {
112 public:
113     QGLTextureGlyphCache(QFontEngine::GlyphFormat format, const QTransform &matrix);
114     ~QGLTextureGlyphCache();
115 
116     virtual void createTextureData(int width, int height) override;
117     virtual void resizeTextureData(int width, int height) override;
118     virtual void fillTexture(const Coord &c, glyph_t glyph, QFixed subPixelPosition) override;
119     virtual int glyphPadding() const override;
120     virtual int maxTextureWidth() const override;
121     virtual int maxTextureHeight() const override;
122 
texture()123     inline GLuint texture() const {
124         QGLTextureGlyphCache *that = const_cast<QGLTextureGlyphCache *>(this);
125         QGLGlyphTexture *glyphTexture = that->m_textureResource;
126         return glyphTexture ? glyphTexture->m_texture : 0;
127     }
128 
width()129     inline int width() const {
130         QGLTextureGlyphCache *that = const_cast<QGLTextureGlyphCache *>(this);
131         QGLGlyphTexture *glyphTexture = that->m_textureResource;
132         return glyphTexture ? glyphTexture->m_width : 0;
133     }
height()134     inline int height() const {
135         QGLTextureGlyphCache *that = const_cast<QGLTextureGlyphCache *>(this);
136         QGLGlyphTexture *glyphTexture = that->m_textureResource;
137         return glyphTexture ? glyphTexture->m_height : 0;
138     }
139 
setPaintEnginePrivate(QGL2PaintEngineExPrivate * p)140     inline void setPaintEnginePrivate(QGL2PaintEngineExPrivate *p) { pex = p; }
141 
contextGroup()142     inline const QOpenGLContextGroup *contextGroup() const { return m_textureResource ? m_textureResource->group() : nullptr; }
143 
serialNumber()144     inline int serialNumber() const { return m_serialNumber; }
145 
146     enum FilterMode {
147         Nearest,
148         Linear
149     };
filterMode()150     FilterMode filterMode() const { return m_filterMode; }
setFilterMode(FilterMode m)151     void setFilterMode(FilterMode m) { m_filterMode = m; }
152 
153     void clear();
154 
155 private:
156     QGLGlyphTexture *m_textureResource;
157 
158     QGL2PaintEngineExPrivate *pex;
159     QGLShaderProgram *m_blitProgram;
160     FilterMode m_filterMode;
161 
162     GLfloat m_vertexCoordinateArray[8];
163     GLfloat m_textureCoordinateArray[8];
164 
165     int m_serialNumber;
166 };
167 
168 QT_END_NAMESPACE
169 
170 #endif
171 
172