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| 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 "GrAtlas.h" | |
| 15 #include "GrDrawTarget.h" | |
| 16 #include "GrFontScaler.h" | |
| 17 #include "GrGlyph.h" | |
| 18 #include "SkTDynamicHash.h" | |
| 19 #include "SkVarAlloc.h" | |
| 20 | |
| 21 class GrFontCache; | |
| 22 class GrGpu; | |
| 23 class GrFontPurgeListener; | |
| 24 | |
| 25 /** | |
| 26 * The textstrike maps a hostfontscaler instance to a dictionary of | |
| 27 * glyphid->strike | |
| 28 */ | |
| 29 class GrTextStrike { | |
| 30 public: | |
| 31 GrTextStrike(GrFontCache*, const GrFontDescKey* fontScalerKey); | |
| 32 ~GrTextStrike(); | |
| 33 | |
| 34 const GrFontDescKey* getFontScalerKey() const { return fFontScalerKey; } | |
| 35 GrFontCache* getFontCache() const { return fFontCache; } | |
| 36 | |
| 37 inline GrGlyph* getGlyph(GrGlyph::PackedID packed, GrFontScaler* scaler) { | |
| 38 GrGlyph* glyph = fCache.find(packed); | |
| 39 if (NULL == glyph) { | |
| 40 glyph = this->generateGlyph(packed, scaler); | |
| 41 } | |
| 42 return glyph; | |
| 43 } | |
| 44 | |
| 45 // returns true if glyph (or glyph+padding for distance field) | |
| 46 // is too large to ever fit in texture atlas subregions (GrPlots) | |
| 47 bool glyphTooLargeForAtlas(GrGlyph*); | |
| 48 // returns true if glyph successfully added to texture atlas, false otherwis
e | |
| 49 bool addGlyphToAtlas(GrGlyph*, GrFontScaler*); | |
| 50 | |
| 51 // testing | |
| 52 int countGlyphs() const { return fCache.count(); } | |
| 53 | |
| 54 // remove any references to this plot | |
| 55 void removePlot(const GrPlot* plot); | |
| 56 | |
| 57 static const GrFontDescKey& GetKey(const GrTextStrike& ts) { | |
| 58 return *(ts.fFontScalerKey); | |
| 59 } | |
| 60 static uint32_t Hash(const GrFontDescKey& key) { | |
| 61 return key.getHash(); | |
| 62 } | |
| 63 | |
| 64 public: | |
| 65 // for easy removal from list | |
| 66 GrTextStrike* fPrev; | |
| 67 GrTextStrike* fNext; | |
| 68 | |
| 69 private: | |
| 70 SkTDynamicHash<GrGlyph, GrGlyph::PackedID> fCache; | |
| 71 const GrFontDescKey* fFontScalerKey; | |
| 72 SkVarAlloc fPool; | |
| 73 | |
| 74 GrFontCache* fFontCache; | |
| 75 | |
| 76 GrAtlas::ClientPlotUsage fPlotUsage; | |
| 77 | |
| 78 GrGlyph* generateGlyph(GrGlyph::PackedID packed, GrFontScaler* scaler); | |
| 79 | |
| 80 friend class GrFontCache; | |
| 81 }; | |
| 82 | |
| 83 class GrFontCache { | |
| 84 public: | |
| 85 GrFontCache(GrGpu*); | |
| 86 ~GrFontCache(); | |
| 87 | |
| 88 inline GrTextStrike* getStrike(GrFontScaler* scaler) { | |
| 89 this->validate(); | |
| 90 | |
| 91 GrTextStrike* strike = fCache.find(*(scaler->getKey())); | |
| 92 if (NULL == strike) { | |
| 93 strike = this->generateStrike(scaler); | |
| 94 } else if (strike->fPrev) { | |
| 95 // Need to put the strike at the head of its dllist, since that is h
ow | |
| 96 // we age the strikes for purging (we purge from the back of the lis
t) | |
| 97 this->detachStrikeFromList(strike); | |
| 98 // attach at the head | |
| 99 fHead->fPrev = strike; | |
| 100 strike->fNext = fHead; | |
| 101 strike->fPrev = NULL; | |
| 102 fHead = strike; | |
| 103 } | |
| 104 this->validate(); | |
| 105 return strike; | |
| 106 } | |
| 107 | |
| 108 // add to texture atlas that matches this format | |
| 109 GrPlot* addToAtlas(GrMaskFormat format, GrAtlas::ClientPlotUsage* usage, | |
| 110 int width, int height, const void* image, | |
| 111 SkIPoint16* loc); | |
| 112 | |
| 113 void freeAll(); | |
| 114 | |
| 115 // make an unused plot available for this glyph | |
| 116 bool freeUnusedPlot(GrTextStrike* preserveStrike, const GrGlyph* glyph); | |
| 117 | |
| 118 // testing | |
| 119 int countStrikes() const { return fCache.count(); } | |
| 120 GrTextStrike* getHeadStrike() const { return fHead; } | |
| 121 | |
| 122 void updateTextures() { | |
| 123 for (int i = 0; i < kAtlasCount; ++i) { | |
| 124 if (fAtlases[i]) { | |
| 125 fAtlases[i]->uploadPlotsToTexture(); | |
| 126 } | |
| 127 } | |
| 128 } | |
| 129 | |
| 130 #ifdef SK_DEBUG | |
| 131 void validate() const; | |
| 132 #else | |
| 133 void validate() const {} | |
| 134 #endif | |
| 135 | |
| 136 void dump() const; | |
| 137 | |
| 138 enum AtlasType { | |
| 139 kA8_AtlasType, //!< 1-byte per pixel | |
| 140 k565_AtlasType, //!< 2-bytes per pixel | |
| 141 k8888_AtlasType, //!< 4-bytes per pixel | |
| 142 | |
| 143 kLast_AtlasType = k8888_AtlasType | |
| 144 }; | |
| 145 static const int kAtlasCount = kLast_AtlasType + 1; | |
| 146 | |
| 147 private: | |
| 148 friend class GrFontPurgeListener; | |
| 149 | |
| 150 SkTDynamicHash<GrTextStrike, GrFontDescKey> fCache; | |
| 151 // for LRU | |
| 152 GrTextStrike* fHead; | |
| 153 GrTextStrike* fTail; | |
| 154 | |
| 155 GrGpu* fGpu; | |
| 156 GrAtlas* fAtlases[kAtlasCount]; | |
| 157 | |
| 158 GrTextStrike* generateStrike(GrFontScaler*); | |
| 159 | |
| 160 inline void detachStrikeFromList(GrTextStrike* strike) { | |
| 161 if (strike->fPrev) { | |
| 162 SkASSERT(fHead != strike); | |
| 163 strike->fPrev->fNext = strike->fNext; | |
| 164 } else { | |
| 165 SkASSERT(fHead == strike); | |
| 166 fHead = strike->fNext; | |
| 167 } | |
| 168 | |
| 169 if (strike->fNext) { | |
| 170 SkASSERT(fTail != strike); | |
| 171 strike->fNext->fPrev = strike->fPrev; | |
| 172 } else { | |
| 173 SkASSERT(fTail == strike); | |
| 174 fTail = strike->fPrev; | |
| 175 } | |
| 176 } | |
| 177 | |
| 178 void purgeStrike(GrTextStrike* strike); | |
| 179 }; | |
| 180 | |
| 181 #endif | |
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Chromium Code Reviews
Issue 1104343003:
remove old text contexts and fontcache (Closed)
Base URL: https://skia.googlesource.com/skia.git@master