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 "GrTHashTable.h" 17 #include "GrPoint.h" 18 #include "GrGlyph.h" 19 #include "GrDrawTarget.h" 20 #include "GrAtlas.h" 21 22 class GrFontCache; 23 class GrGpu; 24 class GrFontPurgeListener; 25 26 /** 27 * The textcache maps a hostfontscaler instance to a dictionary of 28 * glyphid->strike 29 */ 30 class GrTextStrike { 31 public: 32 GrTextStrike(GrFontCache*, const GrKey* fontScalerKey, GrMaskFormat, GrAtlasMgr*); 33 ~GrTextStrike(); 34 getFontScalerKey()35 const GrKey* getFontScalerKey() const { return fFontScalerKey; } getFontCache()36 GrFontCache* getFontCache() const { return fFontCache; } getMaskFormat()37 GrMaskFormat getMaskFormat() const { return fMaskFormat; } 38 39 inline GrGlyph* getGlyph(GrGlyph::PackedID, GrFontScaler*); 40 bool getGlyphAtlas(GrGlyph*, GrFontScaler*); 41 42 // testing countGlyphs()43 int countGlyphs() const { return fCache.getArray().count(); } glyphAt(int index)44 const GrGlyph* glyphAt(int index) const { 45 return fCache.getArray()[index]; 46 } 47 48 // returns true if a plot was removed 49 bool removeUnusedPlots(); 50 51 public: 52 // for LRU 53 GrTextStrike* fPrev; 54 GrTextStrike* fNext; 55 56 private: 57 class Key; 58 GrTHashTable<GrGlyph, Key, 7> fCache; 59 const GrKey* fFontScalerKey; 60 GrTAllocPool<GrGlyph> fPool; 61 62 GrFontCache* fFontCache; 63 GrAtlasMgr* fAtlasMgr; 64 GrMaskFormat fMaskFormat; 65 #if SK_DISTANCEFIELD_FONTS 66 bool fUseDistanceField; 67 #endif 68 69 GrAtlas fAtlas; 70 71 GrGlyph* generateGlyph(GrGlyph::PackedID packed, GrFontScaler* scaler); 72 73 friend class GrFontCache; 74 }; 75 76 class GrFontCache { 77 public: 78 GrFontCache(GrGpu*); 79 ~GrFontCache(); 80 81 #if SK_DISTANCEFIELD_FONTS 82 inline GrTextStrike* getStrike(GrFontScaler*, bool useDistanceField); 83 #else 84 inline GrTextStrike* getStrike(GrFontScaler*); 85 #endif 86 87 void freeAll(); 88 89 void purgeExceptFor(GrTextStrike*); 90 91 // remove an unused plot and its strike (if necessary) 92 void freePlotExceptFor(GrTextStrike*); 93 94 // testing countStrikes()95 int countStrikes() const { return fCache.getArray().count(); } strikeAt(int index)96 const GrTextStrike* strikeAt(int index) const { 97 return fCache.getArray()[index]; 98 } getHeadStrike()99 GrTextStrike* getHeadStrike() const { return fHead; } 100 101 #ifdef SK_DEBUG 102 void validate() const; 103 #else validate()104 void validate() const {} 105 #endif 106 107 #ifdef SK_DEVELOPER 108 void dump() const; 109 #endif 110 111 enum AtlasType { 112 kA8_AtlasType, //!< 1-byte per pixel 113 k565_AtlasType, //!< 2-bytes per pixel 114 k8888_AtlasType, //!< 4-bytes per pixel 115 116 kLast_AtlasType = k8888_AtlasType 117 }; 118 static const int kAtlasCount = kLast_AtlasType + 1; 119 120 private: 121 friend class GrFontPurgeListener; 122 123 class Key; 124 GrTHashTable<GrTextStrike, Key, 8> fCache; 125 // for LRU 126 GrTextStrike* fHead; 127 GrTextStrike* fTail; 128 129 GrGpu* fGpu; 130 GrAtlasMgr* fAtlasMgr[kAtlasCount]; 131 132 GrTextStrike* generateStrike(GrFontScaler*, const Key&); 133 inline void detachStrikeFromList(GrTextStrike*); 134 void purgeStrike(GrTextStrike* strike); 135 }; 136 137 #endif 138