1/* 2 * Copyright (C) 2011, 2012 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' 14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS 17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 23 * THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include "config.h" 27#include "CSSValuePool.h" 28 29#include "CSSParser.h" 30#include "CSSStyleSheet.h" 31#include "CSSValueKeywords.h" 32#include "CSSValueList.h" 33 34namespace WebCore { 35 36CSSValuePool& cssValuePool() 37{ 38 DEFINE_STATIC_LOCAL(CSSValuePool, pool, ()); 39 return pool; 40} 41 42CSSValuePool::CSSValuePool() 43 : m_inheritedValue(CSSInheritedValue::create()) 44 , m_implicitInitialValue(CSSInitialValue::createImplicit()) 45 , m_explicitInitialValue(CSSInitialValue::createExplicit()) 46 , m_colorTransparent(CSSPrimitiveValue::createColor(Color::transparent)) 47 , m_colorWhite(CSSPrimitiveValue::createColor(Color::white)) 48 , m_colorBlack(CSSPrimitiveValue::createColor(Color::black)) 49{ 50} 51 52PassRefPtr<CSSPrimitiveValue> CSSValuePool::createIdentifierValue(int ident) 53{ 54 if (ident <= 0 || ident >= numCSSValueKeywords) 55 return CSSPrimitiveValue::createIdentifier(ident); 56 57 if (!m_identifierValueCache[ident]) 58 m_identifierValueCache[ident] = CSSPrimitiveValue::createIdentifier(ident); 59 return m_identifierValueCache[ident]; 60} 61 62PassRefPtr<CSSPrimitiveValue> CSSValuePool::createColorValue(unsigned rgbValue) 63{ 64 // These are the empty and deleted values of the hash table. 65 if (rgbValue == Color::transparent) 66 return m_colorTransparent; 67 if (rgbValue == Color::white) 68 return m_colorWhite; 69 // Just because it is common. 70 if (rgbValue == Color::black) 71 return m_colorBlack; 72 73 // Just wipe out the cache and start rebuilding if it gets too big. 74 const int maximumColorCacheSize = 512; 75 if (m_colorValueCache.size() > maximumColorCacheSize) 76 m_colorValueCache.clear(); 77 78 RefPtr<CSSPrimitiveValue> dummyValue; 79 ColorValueCache::AddResult entry = m_colorValueCache.add(rgbValue, dummyValue); 80 if (entry.isNewEntry) 81 entry.iterator->value = CSSPrimitiveValue::createColor(rgbValue); 82 return entry.iterator->value; 83} 84 85PassRefPtr<CSSPrimitiveValue> CSSValuePool::createValue(double value, CSSPrimitiveValue::UnitTypes type) 86{ 87 if (value < 0 || value > maximumCacheableIntegerValue) 88 return CSSPrimitiveValue::create(value, type); 89 90 int intValue = static_cast<int>(value); 91 if (value != intValue) 92 return CSSPrimitiveValue::create(value, type); 93 94 RefPtr<CSSPrimitiveValue>* cache; 95 switch (type) { 96 case CSSPrimitiveValue::CSS_PX: 97 cache = m_pixelValueCache; 98 break; 99 case CSSPrimitiveValue::CSS_PERCENTAGE: 100 cache = m_percentValueCache; 101 break; 102 case CSSPrimitiveValue::CSS_NUMBER: 103 cache = m_numberValueCache; 104 break; 105 default: 106 return CSSPrimitiveValue::create(value, type); 107 } 108 109 if (!cache[intValue]) 110 cache[intValue] = CSSPrimitiveValue::create(value, type); 111 return cache[intValue]; 112} 113 114PassRefPtr<CSSPrimitiveValue> CSSValuePool::createFontFamilyValue(const String& familyName) 115{ 116 RefPtr<CSSPrimitiveValue>& value = m_fontFamilyValueCache.add(familyName, 0).iterator->value; 117 if (!value) 118 value = CSSPrimitiveValue::create(familyName, CSSPrimitiveValue::CSS_STRING); 119 return value; 120} 121 122PassRefPtr<CSSValueList> CSSValuePool::createFontFaceValue(const AtomicString& string) 123{ 124 // Just wipe out the cache and start rebuilding if it gets too big. 125 const int maximumFontFaceCacheSize = 128; 126 if (m_fontFaceValueCache.size() > maximumFontFaceCacheSize) 127 m_fontFaceValueCache.clear(); 128 129 RefPtr<CSSValueList>& value = m_fontFaceValueCache.add(string, 0).iterator->value; 130 if (!value) 131 value = CSSParser::parseFontFaceValue(string); 132 return value; 133} 134 135void CSSValuePool::drain() 136{ 137 m_colorValueCache.clear(); 138 m_fontFaceValueCache.clear(); 139 m_fontFamilyValueCache.clear(); 140 141 for (int i = 0; i < numCSSValueKeywords; ++i) 142 m_identifierValueCache[i] = 0; 143 144 for (int i = 0; i < maximumCacheableIntegerValue; ++i) { 145 m_pixelValueCache[i] = 0; 146 m_percentValueCache[i] = 0; 147 m_numberValueCache[i] = 0; 148 } 149} 150 151} 152