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