1 2 /* 3 * Copyright 2010 Google Inc. 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 9 10 11 #ifndef GrTextStrike_DEFINED 12 #define GrTextStrike_DEFINED 13 14 #include "GrAllocPool.h" 15 #include "GrFontScaler.h" 16 #include "SkTDynamicHash.h" 17 #include "GrGlyph.h" 18 #include "GrDrawTarget.h" 19 #include "GrAtlas.h" 20 21 class GrFontCache; 22 class GrGpu; 23 class GrFontPurgeListener; 24 25 /** 26 * The textcache maps a hostfontscaler instance to a dictionary of 27 * glyphid->strike 28 */ 29 class GrTextStrike { 30 public: 31 GrTextStrike(GrFontCache*, const GrFontDescKey* fontScalerKey, GrMaskFormat, GrAtlas*); 32 ~GrTextStrike(); 33 getFontScalerKey()34 const GrFontDescKey* getFontScalerKey() const { return fFontScalerKey; } getFontCache()35 GrFontCache* getFontCache() const { return fFontCache; } getMaskFormat()36 GrMaskFormat getMaskFormat() const { return fMaskFormat; } getTexture()37 GrTexture* getTexture() const { return fAtlas->getTexture(); } 38 39 inline GrGlyph* getGlyph(GrGlyph::PackedID, GrFontScaler*); 40 // returns true if glyph (or glyph+padding for distance field) 41 // is too large to ever fit in texture atlas subregions (GrPlots) 42 bool glyphTooLargeForAtlas(GrGlyph*); 43 // returns true if glyph successfully added to texture atlas, false otherwise 44 bool addGlyphToAtlas(GrGlyph*, GrFontScaler*); 45 46 // testing countGlyphs()47 int countGlyphs() const { return fCache.count(); } 48 49 // remove any references to this plot 50 void removePlot(const GrPlot* plot); 51 GetKey(const GrTextStrike & ts)52 static const GrFontDescKey& GetKey(const GrTextStrike& ts) { 53 return *(ts.fFontScalerKey); 54 } Hash(const GrFontDescKey & key)55 static uint32_t Hash(const GrFontDescKey& key) { 56 return key.getHash(); 57 } 58 59 public: 60 // for easy removal from list 61 GrTextStrike* fPrev; 62 GrTextStrike* fNext; 63 64 private: 65 SkTDynamicHash<GrGlyph, GrGlyph::PackedID> fCache; 66 const GrFontDescKey* fFontScalerKey; 67 GrTAllocPool<GrGlyph> fPool; 68 69 GrFontCache* fFontCache; 70 GrAtlas* fAtlas; 71 GrMaskFormat fMaskFormat; 72 bool fUseDistanceField; 73 74 GrAtlas::ClientPlotUsage fPlotUsage; 75 76 GrGlyph* generateGlyph(GrGlyph::PackedID packed, GrFontScaler* scaler); 77 78 friend class GrFontCache; 79 }; 80 81 class GrFontCache { 82 public: 83 GrFontCache(GrGpu*); 84 ~GrFontCache(); 85 86 inline GrTextStrike* getStrike(GrFontScaler*, bool useDistanceField); 87 88 void freeAll(); 89 90 // make an unused plot available 91 bool freeUnusedPlot(GrTextStrike* preserveStrike); 92 93 // testing countStrikes()94 int countStrikes() const { return fCache.count(); } getHeadStrike()95 GrTextStrike* getHeadStrike() const { return fHead; } 96 updateTextures()97 void updateTextures() { 98 for (int i = 0; i < kAtlasCount; ++i) { 99 if (fAtlases[i]) { 100 fAtlases[i]->uploadPlotsToTexture(); 101 } 102 } 103 } 104 105 #ifdef SK_DEBUG 106 void validate() const; 107 #else validate()108 void validate() const {} 109 #endif 110 111 void dump() const; 112 113 enum AtlasType { 114 kA8_AtlasType, //!< 1-byte per pixel 115 k565_AtlasType, //!< 2-bytes per pixel 116 k8888_AtlasType, //!< 4-bytes per pixel 117 118 kLast_AtlasType = k8888_AtlasType 119 }; 120 static const int kAtlasCount = kLast_AtlasType + 1; 121 122 private: 123 friend class GrFontPurgeListener; 124 125 SkTDynamicHash<GrTextStrike, GrFontDescKey> fCache; 126 // for LRU 127 GrTextStrike* fHead; 128 GrTextStrike* fTail; 129 130 GrGpu* fGpu; 131 GrAtlas* fAtlases[kAtlasCount]; 132 133 GrTextStrike* generateStrike(GrFontScaler*); 134 inline void detachStrikeFromList(GrTextStrike*); 135 void purgeStrike(GrTextStrike* strike); 136 }; 137 138 #endif 139