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
33namespace blink {
34
35CSSValuePool& cssValuePool()
36{
37    DEFINE_STATIC_LOCAL(OwnPtrWillBePersistent<CSSValuePool>, pool, (adoptPtrWillBeNoop(new CSSValuePool())));
38    return *pool;
39}
40
41CSSValuePool::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
55PassRefPtrWillBeRawPtr<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
65PassRefPtrWillBeRawPtr<CSSPrimitiveValue> CSSValuePool::createIdentifierValue(CSSPropertyID ident)
66{
67    return CSSPrimitiveValue::createIdentifier(ident);
68}
69
70PassRefPtrWillBeRawPtr<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
93PassRefPtrWillBeRawPtr<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
123PassRefPtrWillBeRawPtr<CSSPrimitiveValue> CSSValuePool::createValue(const Length& value, const RenderStyle& style)
124{
125    return CSSPrimitiveValue::create(value, style.effectiveZoom());
126}
127
128PassRefPtrWillBeRawPtr<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
136PassRefPtrWillBeRawPtr<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
152void 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