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/*
* Copyright (C) 2011 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "CSSPrimitiveValueCache.h"
namespace WebCore {
CSSPrimitiveValueCache::CSSPrimitiveValueCache()
: m_colorTransparent(CSSPrimitiveValue::createColor(Color::transparent))
, m_colorWhite(CSSPrimitiveValue::createColor(Color::white))
, m_colorBlack(CSSPrimitiveValue::createColor(Color::black))
, m_pixelZero(CSSPrimitiveValue::create(0, CSSPrimitiveValue::CSS_PX))
, m_percentZero(CSSPrimitiveValue::create(0, CSSPrimitiveValue::CSS_PERCENTAGE))
, m_numberZero(CSSPrimitiveValue::create(0, CSSPrimitiveValue::CSS_NUMBER))
{
}
CSSPrimitiveValueCache::~CSSPrimitiveValueCache()
{
}
PassRefPtr<CSSPrimitiveValue> CSSPrimitiveValueCache::createIdentifierValue(int ident)
{
if (ident <= 0 || ident >= numCSSValueKeywords)
return CSSPrimitiveValue::createIdentifier(ident);
RefPtr<CSSPrimitiveValue> dummyValue;
pair<IdentifierValueCache::iterator, bool> entry = m_identifierValueCache.add(ident, dummyValue);
if (entry.second)
entry.first->second = CSSPrimitiveValue::createIdentifier(ident);
return entry.first->second;
}
PassRefPtr<CSSPrimitiveValue> CSSPrimitiveValueCache::createColorValue(unsigned rgbValue)
{
// These are the empty and deleted values of the hash table.
if (rgbValue == Color::transparent)
return m_colorTransparent;
if (rgbValue == Color::white)
return m_colorWhite;
// Just because it is common.
if (rgbValue == Color::black)
return m_colorBlack;
// Just wipe out the cache and start rebuilding if it gets too big.
const int maximumColorCacheSize = 512;
if (m_colorValueCache.size() > maximumColorCacheSize)
m_colorValueCache.clear();
RefPtr<CSSPrimitiveValue> dummyValue;
pair<ColorValueCache::iterator, bool> entry = m_colorValueCache.add(rgbValue, dummyValue);
if (entry.second)
entry.first->second = CSSPrimitiveValue::createColor(rgbValue);
return entry.first->second;
}
PassRefPtr<CSSPrimitiveValue> CSSPrimitiveValueCache::createValue(double value, CSSPrimitiveValue::UnitTypes type)
{
// Small positive integers repeat often.
static const int maximumCacheableValue = 256;
if (value < 0 || value > maximumCacheableValue)
return CSSPrimitiveValue::create(value, type);
int intValue = static_cast<int>(value);
if (value != intValue)
return CSSPrimitiveValue::create(value, type);
IntegerValueCache* cache;
switch (type) {
case CSSPrimitiveValue::CSS_PX:
if (intValue == 0)
return m_pixelZero;
cache = &m_pixelValueCache;
break;
case CSSPrimitiveValue::CSS_PERCENTAGE:
if (intValue == 0)
return m_percentZero;
cache = &m_percentValueCache;
break;
case CSSPrimitiveValue::CSS_NUMBER:
if (intValue == 0)
return m_numberZero;
cache = &m_numberValueCache;
break;
default:
return CSSPrimitiveValue::create(value, type);
}
RefPtr<CSSPrimitiveValue> dummyValue;
pair<IntegerValueCache::iterator, bool> entry = cache->add(intValue, dummyValue);
if (entry.second)
entry.first->second = CSSPrimitiveValue::create(value, type);
return entry.first->second;
}
}
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