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42 #ifndef QTEXTUREGLYPHCACHE_P_H
43 #define QTEXTUREGLYPHCACHE_P_H
49 // This file is not part of the Qt API. It exists for the convenience
50 // of other Qt classes. This header file may change from version to
51 // version without notice, or even be removed.
59 #include <qtransform.h>
61 #include <private/qfontengineglyphcache_p.h>
63 #if defined(Q_OS_VXWORKS) && defined(m_type)
67 #ifndef QT_DEFAULT_TEXTURE_GLYPH_CACHE_WIDTH
68 #define QT_DEFAULT_TEXTURE_GLYPH_CACHE_WIDTH 256
71 struct glyph_metrics_t;
72 typedef unsigned int glyph_t;
79 class Q_GUI_EXPORT QTextureGlyphCache : public QFontEngineGlyphCache
82 QTextureGlyphCache(QFontEngineGlyphCache::Type type, const QTransform &matrix)
83 : QFontEngineGlyphCache(matrix, type), m_current_fontengine(0),
84 m_w(0), m_h(0), m_cx(0), m_cy(0), m_currentRowHeight(0), m_subPixelPositionCount(0)
87 virtual ~QTextureGlyphCache() { }
89 struct GlyphAndSubPixelPosition
91 GlyphAndSubPixelPosition(glyph_t g, QFixed spp) : glyph(g), subPixelPosition(spp) {}
93 bool operator==(const GlyphAndSubPixelPosition &other) const
95 return glyph == other.glyph && subPixelPosition == other.subPixelPosition;
99 QFixed subPixelPosition;
113 return w == 0 || h == 0;
117 bool populate(QFontEngine *fontEngine, int numGlyphs, const glyph_t *glyphs,
118 const QFixedPoint *positions);
119 void fillInPendingGlyphs();
121 virtual void createTextureData(int width, int height) = 0;
122 virtual void resizeTextureData(int width, int height) = 0;
123 virtual int glyphMargin() const { return 0; }
124 virtual int glyphPadding() const { return 0; }
126 virtual void fillTexture(const Coord &coord, glyph_t glyph, QFixed subPixelPosition) = 0;
128 inline void createCache(int width, int height) {
131 createTextureData(width, height);
134 inline void resizeCache(int width, int height)
136 resizeTextureData(width, height);
141 inline bool isNull() const { return m_h == 0; }
143 QHash<GlyphAndSubPixelPosition, Coord> coords;
144 virtual int maxTextureWidth() const { return QT_DEFAULT_TEXTURE_GLYPH_CACHE_WIDTH; }
145 virtual int maxTextureHeight() const { return -1; }
147 QImage textureMapForGlyph(glyph_t g, QFixed subPixelPosition) const;
149 QFixed subPixelPositionForX(QFixed x) const;
152 int calculateSubPixelPositionCount(glyph_t) const;
154 QFontEngine *m_current_fontengine;
155 QHash<GlyphAndSubPixelPosition, Coord> m_pendingGlyphs;
157 int m_w; // image width
158 int m_h; // image height
159 int m_cx; // current x
160 int m_cy; // current y
161 int m_currentRowHeight; // Height of last row
162 int m_subPixelPositionCount; // Number of positions within a single pixel for this cache
165 inline uint qHash(const QTextureGlyphCache::GlyphAndSubPixelPosition &g)
167 return (g.glyph << 8) | (g.subPixelPosition * 10).round().toInt();
171 class Q_GUI_EXPORT QImageTextureGlyphCache : public QTextureGlyphCache
174 QImageTextureGlyphCache(QFontEngineGlyphCache::Type type, const QTransform &matrix)
175 : QTextureGlyphCache(type, matrix) { }
176 virtual int glyphMargin() const;
177 virtual void createTextureData(int width, int height);
178 virtual void resizeTextureData(int width, int height);
179 virtual void fillTexture(const Coord &c, glyph_t glyph, QFixed subPixelPosition);
181 inline const QImage &image() const { return m_image; }