1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/gpu/GrTextStrike.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,131 @@
1.4 +
1.5 +/*
1.6 + * Copyright 2010 Google Inc.
1.7 + *
1.8 + * Use of this source code is governed by a BSD-style license that can be
1.9 + * found in the LICENSE file.
1.10 + */
1.11 +
1.12 +
1.13 +
1.14 +#ifndef GrTextStrike_DEFINED
1.15 +#define GrTextStrike_DEFINED
1.16 +
1.17 +#include "GrAllocPool.h"
1.18 +#include "GrFontScaler.h"
1.19 +#include "GrTHashTable.h"
1.20 +#include "GrPoint.h"
1.21 +#include "GrGlyph.h"
1.22 +#include "GrDrawTarget.h"
1.23 +#include "GrAtlas.h"
1.24 +
1.25 +class GrFontCache;
1.26 +class GrGpu;
1.27 +class GrFontPurgeListener;
1.28 +
1.29 +/**
1.30 + * The textcache maps a hostfontscaler instance to a dictionary of
1.31 + * glyphid->strike
1.32 + */
1.33 +class GrTextStrike {
1.34 +public:
1.35 + GrTextStrike(GrFontCache*, const GrKey* fontScalerKey, GrMaskFormat, GrAtlasMgr*);
1.36 + ~GrTextStrike();
1.37 +
1.38 + const GrKey* getFontScalerKey() const { return fFontScalerKey; }
1.39 + GrFontCache* getFontCache() const { return fFontCache; }
1.40 + GrMaskFormat getMaskFormat() const { return fMaskFormat; }
1.41 +
1.42 + inline GrGlyph* getGlyph(GrGlyph::PackedID, GrFontScaler*);
1.43 + bool addGlyphToAtlas(GrGlyph*, GrFontScaler*);
1.44 +
1.45 + SkISize getAtlasSize() const { return fAtlas.getSize(); }
1.46 +
1.47 + // testing
1.48 + int countGlyphs() const { return fCache.getArray().count(); }
1.49 + const GrGlyph* glyphAt(int index) const {
1.50 + return fCache.getArray()[index];
1.51 + }
1.52 +
1.53 + // remove any references to this plot
1.54 + void removePlot(const GrPlot* plot);
1.55 +
1.56 +public:
1.57 + // for easy removal from list
1.58 + GrTextStrike* fPrev;
1.59 + GrTextStrike* fNext;
1.60 +
1.61 +private:
1.62 + class Key;
1.63 + GrTHashTable<GrGlyph, Key, 7> fCache;
1.64 + const GrKey* fFontScalerKey;
1.65 + GrTAllocPool<GrGlyph> fPool;
1.66 +
1.67 + GrFontCache* fFontCache;
1.68 + GrAtlasMgr* fAtlasMgr;
1.69 + GrMaskFormat fMaskFormat;
1.70 + bool fUseDistanceField;
1.71 +
1.72 + GrAtlas fAtlas;
1.73 +
1.74 + GrGlyph* generateGlyph(GrGlyph::PackedID packed, GrFontScaler* scaler);
1.75 +
1.76 + friend class GrFontCache;
1.77 +};
1.78 +
1.79 +class GrFontCache {
1.80 +public:
1.81 + GrFontCache(GrGpu*);
1.82 + ~GrFontCache();
1.83 +
1.84 + inline GrTextStrike* getStrike(GrFontScaler*, bool useDistanceField);
1.85 +
1.86 + void freeAll();
1.87 +
1.88 + // make an unused plot available
1.89 + bool freeUnusedPlot(GrTextStrike* preserveStrike);
1.90 +
1.91 + // testing
1.92 + int countStrikes() const { return fCache.getArray().count(); }
1.93 + const GrTextStrike* strikeAt(int index) const {
1.94 + return fCache.getArray()[index];
1.95 + }
1.96 + GrTextStrike* getHeadStrike() const { return fHead; }
1.97 +
1.98 +#ifdef SK_DEBUG
1.99 + void validate() const;
1.100 +#else
1.101 + void validate() const {}
1.102 +#endif
1.103 +
1.104 +#ifdef SK_DEVELOPER
1.105 + void dump() const;
1.106 +#endif
1.107 +
1.108 + enum AtlasType {
1.109 + kA8_AtlasType, //!< 1-byte per pixel
1.110 + k565_AtlasType, //!< 2-bytes per pixel
1.111 + k8888_AtlasType, //!< 4-bytes per pixel
1.112 +
1.113 + kLast_AtlasType = k8888_AtlasType
1.114 + };
1.115 + static const int kAtlasCount = kLast_AtlasType + 1;
1.116 +
1.117 +private:
1.118 + friend class GrFontPurgeListener;
1.119 +
1.120 + class Key;
1.121 + GrTHashTable<GrTextStrike, Key, 8> fCache;
1.122 + // for LRU
1.123 + GrTextStrike* fHead;
1.124 + GrTextStrike* fTail;
1.125 +
1.126 + GrGpu* fGpu;
1.127 + GrAtlasMgr* fAtlasMgr[kAtlasCount];
1.128 +
1.129 + GrTextStrike* generateStrike(GrFontScaler*, const Key&);
1.130 + inline void detachStrikeFromList(GrTextStrike*);
1.131 + void purgeStrike(GrTextStrike* strike);
1.132 +};
1.133 +
1.134 +#endif
