add gpu backend (not hooked up yet)

git-svn-id: http://skia.googlecode.com/svn/trunk@649 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 113 insertions, 0 deletions

diff --git a/gpu/src/GrTextStrike_impl.h b/gpu/src/GrTextStrike_impl.h
new file mode 100644
index 0000000000..7e03e2aff4
--- /dev/null
+++ b/gpu/src/GrTextStrike_impl.h
@@ -0,0 +1,113 @@
+/*
+    Copyright 2010 Google Inc.
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+         http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+ */
+
+
+#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
+