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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/CSSParser.h"
     30 #include "core/css/CSSValueList.h"
     31 #include "core/rendering/style/RenderStyle.h"
     32 
     33 namespace WebCore {
     34 
     35 CSSValuePool& cssValuePool()
     36 {
     37     DEFINE_STATIC_LOCAL(CSSValuePool, pool, ());
     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 }
     50 
     51 PassRefPtr<CSSPrimitiveValue> CSSValuePool::createIdentifierValue(CSSValueID ident)
     52 {
     53     if (ident <= 0)
     54         return CSSPrimitiveValue::createIdentifier(ident);
     55 
     56     if (!m_identifierValueCache[ident])
     57         m_identifierValueCache[ident] = CSSPrimitiveValue::createIdentifier(ident);
     58     return m_identifierValueCache[ident];
     59 }
     60 
     61 PassRefPtr<CSSPrimitiveValue> CSSValuePool::createIdentifierValue(CSSPropertyID ident)
     62 {
     63     return CSSPrimitiveValue::createIdentifier(ident);
     64 }
     65 
     66 PassRefPtr<CSSPrimitiveValue> CSSValuePool::createColorValue(unsigned rgbValue)
     67 {
     68     // These are the empty and deleted values of the hash table.
     69     if (rgbValue == Color::transparent)
     70         return m_colorTransparent;
     71     if (rgbValue == Color::white)
     72         return m_colorWhite;
     73     // Just because it is common.
     74     if (rgbValue == Color::black)
     75         return m_colorBlack;
     76 
     77     // Just wipe out the cache and start rebuilding if it gets too big.
     78     const unsigned maximumColorCacheSize = 512;
     79     if (m_colorValueCache.size() > maximumColorCacheSize)
     80         m_colorValueCache.clear();
     81 
     82     RefPtr<CSSPrimitiveValue> dummyValue;
     83     ColorValueCache::AddResult entry = m_colorValueCache.add(rgbValue, dummyValue);
     84     if (entry.isNewEntry)
     85         entry.iterator->value = CSSPrimitiveValue::createColor(rgbValue);
     86     return entry.iterator->value;
     87 }
     88 
     89 PassRefPtr<CSSPrimitiveValue> CSSValuePool::createValue(double value, CSSPrimitiveValue::UnitTypes type)
     90 {
     91     if (value < 0 || value > maximumCacheableIntegerValue)
     92         return CSSPrimitiveValue::create(value, type);
     93 
     94     int intValue = static_cast<int>(value);
     95     if (value != intValue)
     96         return CSSPrimitiveValue::create(value, type);
     97 
     98     RefPtr<CSSPrimitiveValue>* cache;
     99     switch (type) {
    100     case CSSPrimitiveValue::CSS_PX:
    101         cache = m_pixelValueCache;
    102         break;
    103     case CSSPrimitiveValue::CSS_PERCENTAGE:
    104         cache = m_percentValueCache;
    105         break;
    106     case CSSPrimitiveValue::CSS_NUMBER:
    107         cache = m_numberValueCache;
    108         break;
    109     default:
    110         return CSSPrimitiveValue::create(value, type);
    111     }
    112 
    113     if (!cache[intValue])
    114         cache[intValue] = CSSPrimitiveValue::create(value, type);
    115     return cache[intValue];
    116 }
    117 
    118 PassRefPtr<CSSPrimitiveValue> CSSValuePool::createValue(const Length& value, const RenderStyle& style)
    119 {
    120     return CSSPrimitiveValue::create(value, style.effectiveZoom());
    121 }
    122 
    123 PassRefPtr<CSSPrimitiveValue> CSSValuePool::createFontFamilyValue(const String& familyName)
    124 {
    125     RefPtr<CSSPrimitiveValue>& value = m_fontFamilyValueCache.add(familyName, 0).iterator->value;
    126     if (!value)
    127         value = CSSPrimitiveValue::create(familyName, CSSPrimitiveValue::CSS_STRING);
    128     return value;
    129 }
    130 
    131 PassRefPtr<CSSValueList> CSSValuePool::createFontFaceValue(const AtomicString& string)
    132 {
    133     // Just wipe out the cache and start rebuilding if it gets too big.
    134     const unsigned maximumFontFaceCacheSize = 128;
    135     if (m_fontFaceValueCache.size() > maximumFontFaceCacheSize)
    136         m_fontFaceValueCache.clear();
    137 
    138     RefPtr<CSSValueList>& value = m_fontFaceValueCache.add(string, 0).iterator->value;
    139     if (!value)
    140         value = CSSParser::parseFontFaceValue(string);
    141     return value;
    142 }
    143 
    144 }
    145