michael@0: 
michael@0: /*
michael@0:  * Copyright 2010 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: 
michael@0: 
michael@0: #ifndef GrTextStrike_DEFINED
michael@0: #define GrTextStrike_DEFINED
michael@0: 
michael@0: #include "GrAllocPool.h"
michael@0: #include "GrFontScaler.h"
michael@0: #include "GrTHashTable.h"
michael@0: #include "GrPoint.h"
michael@0: #include "GrGlyph.h"
michael@0: #include "GrDrawTarget.h"
michael@0: #include "GrAtlas.h"
michael@0: 
michael@0: class GrFontCache;
michael@0: class GrGpu;
michael@0: class GrFontPurgeListener;
michael@0: 
michael@0: /**
michael@0:  *  The textcache maps a hostfontscaler instance to a dictionary of
michael@0:  *  glyphid->strike
michael@0:  */
michael@0: class GrTextStrike {
michael@0: public:
michael@0:     GrTextStrike(GrFontCache*, const GrKey* fontScalerKey, GrMaskFormat, GrAtlasMgr*);
michael@0:     ~GrTextStrike();
michael@0: 
michael@0:     const GrKey* getFontScalerKey() const { return fFontScalerKey; }
michael@0:     GrFontCache* getFontCache() const { return fFontCache; }
michael@0:     GrMaskFormat getMaskFormat() const { return fMaskFormat; }
michael@0: 
michael@0:     inline GrGlyph* getGlyph(GrGlyph::PackedID, GrFontScaler*);
michael@0:     bool addGlyphToAtlas(GrGlyph*, GrFontScaler*);
michael@0: 
michael@0:     SkISize getAtlasSize() const { return fAtlas.getSize(); }
michael@0: 
michael@0:     // testing
michael@0:     int countGlyphs() const { return fCache.getArray().count(); }
michael@0:     const GrGlyph* glyphAt(int index) const {
michael@0:         return fCache.getArray()[index];
michael@0:     }
michael@0: 
michael@0:     // remove any references to this plot
michael@0:     void removePlot(const GrPlot* plot);
michael@0: 
michael@0: public:
michael@0:     // for easy removal from list
michael@0:     GrTextStrike*   fPrev;
michael@0:     GrTextStrike*   fNext;
michael@0: 
michael@0: private:
michael@0:     class Key;
michael@0:     GrTHashTable<GrGlyph, Key, 7> fCache;
michael@0:     const GrKey* fFontScalerKey;
michael@0:     GrTAllocPool<GrGlyph> fPool;
michael@0: 
michael@0:     GrFontCache*    fFontCache;
michael@0:     GrAtlasMgr*     fAtlasMgr;
michael@0:     GrMaskFormat    fMaskFormat;
michael@0:     bool            fUseDistanceField;
michael@0: 
michael@0:     GrAtlas         fAtlas;
michael@0: 
michael@0:     GrGlyph* generateGlyph(GrGlyph::PackedID packed, GrFontScaler* scaler);
michael@0: 
michael@0:     friend class GrFontCache;
michael@0: };
michael@0: 
michael@0: class GrFontCache {
michael@0: public:
michael@0:     GrFontCache(GrGpu*);
michael@0:     ~GrFontCache();
michael@0: 
michael@0:     inline GrTextStrike* getStrike(GrFontScaler*, bool useDistanceField);
michael@0: 
michael@0:     void freeAll();
michael@0: 
michael@0:     // make an unused plot available
michael@0:     bool freeUnusedPlot(GrTextStrike* preserveStrike);
michael@0: 
michael@0:     // testing
michael@0:     int countStrikes() const { return fCache.getArray().count(); }
michael@0:     const GrTextStrike* strikeAt(int index) const {
michael@0:         return fCache.getArray()[index];
michael@0:     }
michael@0:     GrTextStrike* getHeadStrike() const { return fHead; }
michael@0: 
michael@0: #ifdef SK_DEBUG
michael@0:     void validate() const;
michael@0: #else
michael@0:     void validate() const {}
michael@0: #endif
michael@0: 
michael@0: #ifdef SK_DEVELOPER
michael@0:     void dump() const;
michael@0: #endif
michael@0: 
michael@0:     enum AtlasType {
michael@0:         kA8_AtlasType,   //!< 1-byte per pixel
michael@0:         k565_AtlasType,  //!< 2-bytes per pixel
michael@0:         k8888_AtlasType, //!< 4-bytes per pixel
michael@0: 
michael@0:         kLast_AtlasType = k8888_AtlasType
michael@0:     };
michael@0:     static const int kAtlasCount = kLast_AtlasType + 1;
michael@0: 
michael@0: private:
michael@0:     friend class GrFontPurgeListener;
michael@0: 
michael@0:     class Key;
michael@0:     GrTHashTable<GrTextStrike, Key, 8> fCache;
michael@0:     // for LRU
michael@0:     GrTextStrike* fHead;
michael@0:     GrTextStrike* fTail;
michael@0: 
michael@0:     GrGpu*      fGpu;
michael@0:     GrAtlasMgr* fAtlasMgr[kAtlasCount];
michael@0: 
michael@0:     GrTextStrike* generateStrike(GrFontScaler*, const Key&);
michael@0:     inline void detachStrikeFromList(GrTextStrike*);
michael@0:     void purgeStrike(GrTextStrike* strike);
michael@0: };
michael@0: 
michael@0: #endif