120 lines
2.9 KiB
C
120 lines
2.9 KiB
C
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/*
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Copyright 2010 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#ifndef GrTextStrike_DEFINED
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#define GrTextStrike_DEFINED
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#include "GrAllocPool.h"
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#include "GrFontScaler.h"
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#include "GrTHashCache.h"
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#include "GrPoint.h"
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#include "GrGlyph.h"
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class GrAtlasMgr;
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class GrFontCache;
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class GrGpu;
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class GrFontPurgeListener;
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/**
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* The textcache maps a hostfontscaler instance to a dictionary of
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* glyphid->strike
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*/
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class GrTextStrike {
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public:
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GrTextStrike(GrFontCache*, const GrKey* fontScalerKey, GrAtlasMgr*);
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~GrTextStrike();
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const GrKey* getFontScalerKey() const { return fFontScalerKey; }
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GrFontCache* getFontCache() const { return fFontCache; }
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inline GrGlyph* getGlyph(GrGlyph::PackedID, GrFontScaler*);
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bool getGlyphAtlas(GrGlyph*, GrFontScaler*);
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// testing
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int countGlyphs() const { return fCache.getArray().count(); }
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const GrGlyph* glyphAt(int index) const {
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return fCache.getArray()[index];
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}
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GrAtlas* getAtlas() const { return fAtlas; }
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public:
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// for LRU
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GrTextStrike* fPrev;
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GrTextStrike* fNext;
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private:
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class Key;
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GrTHashTable<GrGlyph, Key, 7> fCache;
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const GrKey* fFontScalerKey;
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GrTAllocPool<GrGlyph> fPool;
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GrFontCache* fFontCache;
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GrAtlasMgr* fAtlasMgr;
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GrAtlas* fAtlas; // linklist
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GrGlyph* generateGlyph(GrGlyph::PackedID packed, GrFontScaler* scaler);
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// returns true if after the purge, the strike is empty
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bool purgeAtlasAtY(GrAtlas* atlas, int yCoord);
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friend class GrFontCache;
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};
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class GrFontCache {
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public:
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GrFontCache(GrGpu*);
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~GrFontCache();
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inline GrTextStrike* getStrike(GrFontScaler*);
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void freeAll();
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void abandonAll();
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void purgeExceptFor(GrTextStrike*);
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// testing
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int countStrikes() const { return fCache.getArray().count(); }
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const GrTextStrike* strikeAt(int index) const {
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return fCache.getArray()[index];
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}
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GrTextStrike* getHeadStrike() const { return fHead; }
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#if GR_DEBUG
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void validate() const;
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#else
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void validate() const {}
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#endif
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private:
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friend class GrFontPurgeListener;
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class Key;
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GrTHashTable<GrTextStrike, Key, 8> fCache;
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// for LRU
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GrTextStrike* fHead;
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GrTextStrike* fTail;
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GrGpu* fGpu;
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GrAtlasMgr* fAtlasMgr;
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GrTextStrike* generateStrike(GrFontScaler*, const Key&);
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inline void detachStrikeFromList(GrTextStrike*);
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};
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#endif
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