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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_impl_DEFINED
#define GrTextStrike_impl_DEFINED
class GrFontCache::Key {
public:
Key(GrFontScaler* scaler) {
fFontScalerKey = scaler->getKey();
}
uint32_t getHash() const { return fFontScalerKey->getHash(); }
static bool LT(const GrTextStrike& strike, const Key& key) {
return *strike.getFontScalerKey() < *key.fFontScalerKey;
}
static bool EQ(const GrTextStrike& strike, const Key& key) {
return *strike.getFontScalerKey() == *key.fFontScalerKey;
}
private:
const GrKey* fFontScalerKey;
};
void GrFontCache::detachStrikeFromList(GrTextStrike* strike) {
if (strike->fPrev) {
GrAssert(fHead != strike);
strike->fPrev->fNext = strike->fNext;
} else {
GrAssert(fHead == strike);
fHead = strike->fNext;
}
if (strike->fNext) {
GrAssert(fTail != strike);
strike->fNext->fPrev = strike->fPrev;
} else {
GrAssert(fTail == strike);
fTail = strike->fPrev;
}
}
GrTextStrike* GrFontCache::getStrike(GrFontScaler* scaler) {
this->validate();
Key key(scaler);
GrTextStrike* strike = fCache.find(key);
if (NULL == strike) {
strike = this->generateStrike(scaler, key);
} else if (strike->fPrev) {
// Need to put the strike at the head of its dllist, since that is how
// we age the strikes for purging (we purge from the back of the list
this->detachStrikeFromList(strike);
// attach at the head
fHead->fPrev = strike;
strike->fNext = fHead;
strike->fPrev = NULL;
fHead = strike;
}
this->validate();
return strike;
}
///////////////////////////////////////////////////////////////////////////////
/**
* This Key just wraps a glyphID, and matches the protocol need for
* GrTHashTable
*/
class GrTextStrike::Key {
public:
Key(GrGlyph::PackedID id) : fPackedID(id) {}
uint32_t getHash() const { return fPackedID; }
static bool LT(const GrGlyph& glyph, const Key& key) {
return glyph.fPackedID < key.fPackedID;
}
static bool EQ(const GrGlyph& glyph, const Key& key) {
return glyph.fPackedID == key.fPackedID;
}
private:
GrGlyph::PackedID fPackedID;
};
GrGlyph* GrTextStrike::getGlyph(GrGlyph::PackedID packed,
GrFontScaler* scaler) {
GrGlyph* glyph = fCache.find(packed);
if (NULL == glyph) {
glyph = this->generateGlyph(packed, scaler);
}
return glyph;
}
#endif
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