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