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39 | |
40 | #ifndef QTEXTUREGLYPHCACHE_P_H |
41 | #define QTEXTUREGLYPHCACHE_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 for the convenience |
48 | // of other Qt classes. 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 <QtGui/private/qtguiglobal_p.h> |
55 | #include <qhash.h> |
56 | #include <qimage.h> |
57 | #include <qobject.h> |
58 | #include <qtransform.h> |
59 | |
60 | #include <private/qfontengineglyphcache_p.h> |
61 | |
62 | #ifndef QT_DEFAULT_TEXTURE_GLYPH_CACHE_WIDTH |
63 | #define QT_DEFAULT_TEXTURE_GLYPH_CACHE_WIDTH 256 |
64 | #endif |
65 | |
66 | struct glyph_metrics_t; |
67 | typedef unsigned int glyph_t; |
68 | |
69 | |
70 | QT_BEGIN_NAMESPACE |
71 | |
72 | class QTextItemInt; |
73 | |
74 | class Q_GUI_EXPORT QTextureGlyphCache : public QFontEngineGlyphCache |
75 | { |
76 | public: |
77 | QTextureGlyphCache(QFontEngine::GlyphFormat format, const QTransform &matrix, const QColor &color = QColor()) |
78 | : QFontEngineGlyphCache(format, matrix, color), m_current_fontengine(nullptr), |
79 | m_w(0), m_h(0), m_cx(0), m_cy(0), m_currentRowHeight(0) |
80 | { } |
81 | |
82 | ~QTextureGlyphCache(); |
83 | |
84 | struct GlyphAndSubPixelPosition |
85 | { |
86 | GlyphAndSubPixelPosition(glyph_t g, QFixed spp) : glyph(g), subPixelPosition(spp) {} |
87 | |
88 | bool operator==(const GlyphAndSubPixelPosition &other) const |
89 | { |
90 | return glyph == other.glyph && subPixelPosition == other.subPixelPosition; |
91 | } |
92 | |
93 | glyph_t glyph; |
94 | QFixed subPixelPosition; |
95 | }; |
96 | |
97 | struct Coord { |
98 | int x; |
99 | int y; |
100 | int w; |
101 | int h; |
102 | |
103 | int baseLineX; |
104 | int baseLineY; |
105 | |
106 | bool isNull() const |
107 | { |
108 | return w == 0 || h == 0; |
109 | } |
110 | }; |
111 | |
112 | bool populate(QFontEngine *fontEngine, int numGlyphs, const glyph_t *glyphs, |
113 | const QFixedPoint *positions); |
114 | bool hasPendingGlyphs() const { return !m_pendingGlyphs.isEmpty(); }; |
115 | void fillInPendingGlyphs(); |
116 | |
117 | virtual void createTextureData(int width, int height) = 0; |
118 | virtual void resizeTextureData(int width, int height) = 0; |
119 | virtual int glyphPadding() const { return 0; } |
120 | |
121 | virtual void beginFillTexture() { } |
122 | virtual void fillTexture(const Coord &coord, glyph_t glyph, QFixed subPixelPosition) = 0; |
123 | virtual void endFillTexture() { } |
124 | |
125 | inline void createCache(int width, int height) { |
126 | m_w = width; |
127 | m_h = height; |
128 | createTextureData(width, height); |
129 | } |
130 | |
131 | inline void resizeCache(int width, int height) |
132 | { |
133 | resizeTextureData(width, height); |
134 | m_w = width; |
135 | m_h = height; |
136 | } |
137 | |
138 | inline bool isNull() const { return m_h == 0; } |
139 | |
140 | QHash<GlyphAndSubPixelPosition, Coord> coords; |
141 | virtual int maxTextureWidth() const { return QT_DEFAULT_TEXTURE_GLYPH_CACHE_WIDTH; } |
142 | virtual int maxTextureHeight() const { return -1; } |
143 | |
144 | QImage textureMapForGlyph(glyph_t g, QFixed subPixelPosition) const; |
145 | |
146 | protected: |
147 | int calculateSubPixelPositionCount(glyph_t) const; |
148 | |
149 | QFontEngine *m_current_fontengine; |
150 | QHash<GlyphAndSubPixelPosition, Coord> m_pendingGlyphs; |
151 | |
152 | int m_w; // image width |
153 | int m_h; // image height |
154 | int m_cx; // current x |
155 | int m_cy; // current y |
156 | int m_currentRowHeight; // Height of last row |
157 | }; |
158 | |
159 | inline uint qHash(const QTextureGlyphCache::GlyphAndSubPixelPosition &g) |
160 | { |
161 | return (g.glyph << 8) | (g.subPixelPosition * 10).round().toInt(); |
162 | } |
163 | |
164 | |
165 | class Q_GUI_EXPORT QImageTextureGlyphCache : public QTextureGlyphCache |
166 | { |
167 | public: |
168 | QImageTextureGlyphCache(QFontEngine::GlyphFormat format, const QTransform &matrix, const QColor &color = QColor()) |
169 | : QTextureGlyphCache(format, matrix, color) { } |
170 | ~QImageTextureGlyphCache(); |
171 | |
172 | virtual void createTextureData(int width, int height) override; |
173 | virtual void resizeTextureData(int width, int height) override; |
174 | virtual void fillTexture(const Coord &c, glyph_t glyph, QFixed subPixelPosition) override; |
175 | |
176 | inline const QImage &image() const { return m_image; } |
177 | |
178 | private: |
179 | QImage m_image; |
180 | }; |
181 | |
182 | QT_END_NAMESPACE |
183 | |
184 | #endif |
185 | |