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