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 "core/css/CSSValuePool.h" 28 29 #include "core/css/CSSValueList.h" 30 #include "core/css/parser/CSSParser.h" 31 #include "core/rendering/style/RenderStyle.h" 32 33 namespace blink { 34 35 CSSValuePool& cssValuePool() 36 { 37 DEFINE_STATIC_LOCAL(OwnPtrWillBePersistent<CSSValuePool>, pool, (adoptPtrWillBeNoop(new CSSValuePool()))); 38 return *pool; 39 } 40 41 CSSValuePool::CSSValuePool() 42 : m_inheritedValue(CSSInheritedValue::create()) 43 , m_implicitInitialValue(CSSInitialValue::createImplicit()) 44 , m_explicitInitialValue(CSSInitialValue::createExplicit()) 45 , m_colorTransparent(CSSPrimitiveValue::createColor(Color::transparent)) 46 , m_colorWhite(CSSPrimitiveValue::createColor(Color::white)) 47 , m_colorBlack(CSSPrimitiveValue::createColor(Color::black)) 48 { 49 m_identifierValueCache.resize(numCSSValueKeywords); 50 m_pixelValueCache.resize(maximumCacheableIntegerValue + 1); 51 m_percentValueCache.resize(maximumCacheableIntegerValue + 1); 52 m_numberValueCache.resize(maximumCacheableIntegerValue + 1); 53 } 54 55 PassRefPtrWillBeRawPtr<CSSPrimitiveValue> CSSValuePool::createIdentifierValue(CSSValueID ident) 56 { 57 if (ident <= 0) 58 return CSSPrimitiveValue::createIdentifier(ident); 59 60 if (!m_identifierValueCache[ident]) 61 m_identifierValueCache[ident] = CSSPrimitiveValue::createIdentifier(ident); 62 return m_identifierValueCache[ident]; 63 } 64 65 PassRefPtrWillBeRawPtr<CSSPrimitiveValue> CSSValuePool::createIdentifierValue(CSSPropertyID ident) 66 { 67 return CSSPrimitiveValue::createIdentifier(ident); 68 } 69 70 PassRefPtrWillBeRawPtr<CSSPrimitiveValue> CSSValuePool::createColorValue(unsigned rgbValue) 71 { 72 // These are the empty and deleted values of the hash table. 73 if (rgbValue == Color::transparent) 74 return m_colorTransparent; 75 if (rgbValue == Color::white) 76 return m_colorWhite; 77 // Just because it is common. 78 if (rgbValue == Color::black) 79 return m_colorBlack; 80 81 // Just wipe out the cache and start rebuilding if it gets too big. 82 const unsigned maximumColorCacheSize = 512; 83 if (m_colorValueCache.size() > maximumColorCacheSize) 84 m_colorValueCache.clear(); 85 86 RefPtrWillBeRawPtr<CSSPrimitiveValue> dummyValue = nullptr; 87 ColorValueCache::AddResult entry = m_colorValueCache.add(rgbValue, dummyValue); 88 if (entry.isNewEntry) 89 entry.storedValue->value = CSSPrimitiveValue::createColor(rgbValue); 90 return entry.storedValue->value; 91 } 92 93 PassRefPtrWillBeRawPtr<CSSPrimitiveValue> CSSValuePool::createValue(double value, CSSPrimitiveValue::UnitType type) 94 { 95 if (std::isinf(value)) 96 value = 0; 97 98 if (value < 0 || value > maximumCacheableIntegerValue) 99 return CSSPrimitiveValue::create(value, type); 100 101 int intValue = static_cast<int>(value); 102 if (value != intValue) 103 return CSSPrimitiveValue::create(value, type); 104 105 switch (type) { 106 case CSSPrimitiveValue::CSS_PX: 107 if (!m_pixelValueCache[intValue]) 108 m_pixelValueCache[intValue] = CSSPrimitiveValue::create(value, type); 109 return m_pixelValueCache[intValue]; 110 case CSSPrimitiveValue::CSS_PERCENTAGE: 111 if (!m_percentValueCache[intValue]) 112 m_percentValueCache[intValue] = CSSPrimitiveValue::create(value, type); 113 return m_percentValueCache[intValue]; 114 case CSSPrimitiveValue::CSS_NUMBER: 115 if (!m_numberValueCache[intValue]) 116 m_numberValueCache[intValue] = CSSPrimitiveValue::create(value, type); 117 return m_numberValueCache[intValue]; 118 default: 119 return CSSPrimitiveValue::create(value, type); 120 } 121 } 122 123 PassRefPtrWillBeRawPtr<CSSPrimitiveValue> CSSValuePool::createValue(const Length& value, const RenderStyle& style) 124 { 125 return CSSPrimitiveValue::create(value, style.effectiveZoom()); 126 } 127 128 PassRefPtrWillBeRawPtr<CSSPrimitiveValue> CSSValuePool::createFontFamilyValue(const String& familyName) 129 { 130 RefPtrWillBeMember<CSSPrimitiveValue>& value = m_fontFamilyValueCache.add(familyName, nullptr).storedValue->value; 131 if (!value) 132 value = CSSPrimitiveValue::create(familyName, CSSPrimitiveValue::CSS_STRING); 133 return value; 134 } 135 136 PassRefPtrWillBeRawPtr<CSSValueList> CSSValuePool::createFontFaceValue(const AtomicString& string) 137 { 138 // Just wipe out the cache and start rebuilding if it gets too big. 139 const unsigned maximumFontFaceCacheSize = 128; 140 if (m_fontFaceValueCache.size() > maximumFontFaceCacheSize) 141 m_fontFaceValueCache.clear(); 142 143 RefPtrWillBeMember<CSSValueList>& value = m_fontFaceValueCache.add(string, nullptr).storedValue->value; 144 if (!value) { 145 RefPtrWillBeRawPtr<CSSValue> parsedValue = CSSParser::parseSingleValue(CSSPropertyFontFamily, string); 146 if (parsedValue && parsedValue->isValueList()) 147 value = toCSSValueList(parsedValue.get()); 148 } 149 return value; 150 } 151 152 void CSSValuePool::trace(Visitor* visitor) 153 { 154 #if ENABLE(OILPAN) 155 visitor->trace(m_inheritedValue); 156 visitor->trace(m_implicitInitialValue); 157 visitor->trace(m_explicitInitialValue); 158 visitor->trace(m_identifierValueCache); 159 visitor->trace(m_colorValueCache); 160 visitor->trace(m_colorTransparent); 161 visitor->trace(m_colorWhite); 162 visitor->trace(m_colorBlack); 163 visitor->trace(m_pixelValueCache); 164 visitor->trace(m_percentValueCache); 165 visitor->trace(m_numberValueCache); 166 visitor->trace(m_fontFaceValueCache); 167 visitor->trace(m_fontFamilyValueCache); 168 #endif 169 } 170 171 } 172