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      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