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/*
* Copyright (C) 2011-2018 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 "CSSValuePool.h"
#include "CSSParser.h"
#include "CSSPrimitiveValueMappings.h"
#include "CSSValueKeywords.h"
#include "CSSValueList.h"
#include <wtf/text/StringConcatenateNumbers.h>
namespace WebCore {
LazyNeverDestroyed<StaticCSSValuePool> staticCSSValuePool;
StaticCSSValuePool::StaticCSSValuePool()
{
m_implicitInitialValue.construct(CSSValue::StaticCSSValue, CSSPrimitiveValue::ImplicitInitialValue);
m_transparentColor.construct(CSSValue::StaticCSSValue, Color::transparentBlack);
m_whiteColor.construct(CSSValue::StaticCSSValue, Color::white);
m_blackColor.construct(CSSValue::StaticCSSValue, Color::black);
for (unsigned i = firstCSSValueKeyword; i <= lastCSSValueKeyword; ++i)
m_identifierValues[i].construct(CSSValue::StaticCSSValue, static_cast<CSSValueID>(i));
for (unsigned i = 0; i < (maximumCacheableIntegerValue + 1); ++i) {
m_pixelValues[i].construct(CSSValue::StaticCSSValue, i, CSSUnitType::CSS_PX);
m_percentValues[i].construct(CSSValue::StaticCSSValue, i, CSSUnitType::CSS_PERCENTAGE);
m_numberValues[i].construct(CSSValue::StaticCSSValue, i, CSSUnitType::CSS_NUMBER);
}
}
void StaticCSSValuePool::init()
{
static std::once_flag onceKey;
std::call_once(onceKey, []() {
staticCSSValuePool.construct();
});
}
CSSValuePool::CSSValuePool()
{
StaticCSSValuePool::init();
}
CSSValuePool& CSSValuePool::singleton()
{
static MainThreadNeverDestroyed<CSSValuePool> pool;
return pool;
}
Ref<CSSPrimitiveValue> CSSValuePool::createIdentifierValue(CSSValueID ident)
{
RELEASE_ASSERT(ident >= firstCSSValueKeyword && ident <= lastCSSValueKeyword);
return staticCSSValuePool->m_identifierValues[ident].get();
}
Ref<CSSPrimitiveValue> CSSValuePool::createIdentifierValue(CSSPropertyID ident)
{
return CSSPrimitiveValue::createIdentifier(ident);
}
Ref<CSSPrimitiveValue> CSSValuePool::createColorValue(const Color& color)
{
// These are the empty and deleted values of the hash table.
if (color == Color::transparentBlack)
return staticCSSValuePool->m_transparentColor.get();
if (color == Color::white)
return staticCSSValuePool->m_whiteColor.get();
// Just because it is common.
if (color == Color::black)
return staticCSSValuePool->m_blackColor.get();
// Remove one entry at random if the cache grows too large.
// FIXME: Use TinyLRUCache instead?
const int maximumColorCacheSize = 512;
if (m_colorValueCache.size() >= maximumColorCacheSize)
m_colorValueCache.remove(m_colorValueCache.random());
return *m_colorValueCache.ensure(color, [&color] {
return CSSPrimitiveValue::create(color);
}).iterator->value;
}
Ref<CSSPrimitiveValue> CSSValuePool::createValue(double value, CSSUnitType type)
{
if (value < 0 || value > StaticCSSValuePool::maximumCacheableIntegerValue)
return CSSPrimitiveValue::create(value, type);
int intValue = static_cast<int>(value);
if (value != intValue)
return CSSPrimitiveValue::create(value, type);
switch (type) {
case CSSUnitType::CSS_PX:
return staticCSSValuePool->m_pixelValues[intValue].get();
case CSSUnitType::CSS_PERCENTAGE:
return staticCSSValuePool->m_percentValues[intValue].get();
case CSSUnitType::CSS_NUMBER:
return staticCSSValuePool->m_numberValues[intValue].get();
default:
return CSSPrimitiveValue::create(value, type);
}
}
Ref<CSSPrimitiveValue> CSSValuePool::createFontFamilyValue(const String& familyName, FromSystemFontID fromSystemFontID)
{
// Remove one entry at random if the cache grows too large.
// FIXME: Use TinyLRUCache instead?
const int maximumFontFamilyCacheSize = 128;
if (m_fontFamilyValueCache.size() >= maximumFontFamilyCacheSize)
m_fontFamilyValueCache.remove(m_fontFamilyValueCache.random());
bool isFromSystemID = fromSystemFontID == FromSystemFontID::Yes;
return *m_fontFamilyValueCache.ensure({ familyName, isFromSystemID }, [&familyName, isFromSystemID] {
return CSSPrimitiveValue::create(CSSFontFamily { familyName, isFromSystemID });
}).iterator->value;
}
RefPtr<CSSValueList> CSSValuePool::createFontFaceValue(const AtomString& string)
{
// Remove one entry at random if the cache grows too large.
// FIXME: Use TinyLRUCache instead?
const int maximumFontFaceCacheSize = 128;
if (m_fontFaceValueCache.size() >= maximumFontFaceCacheSize)
m_fontFaceValueCache.remove(m_fontFaceValueCache.random());
return m_fontFaceValueCache.ensure(string, [&string] () -> RefPtr<CSSValueList> {
auto result = CSSParser::parseSingleValue(CSSPropertyFontFamily, string);
if (!is<CSSValueList>(result))
return nullptr;
// FIXME: Make downcast work on RefPtr, remove the get() below, and save one reference count churn.
return downcast<CSSValueList>(result.get());
}).iterator->value;
}
void CSSValuePool::drain()
{
m_colorValueCache.clear();
m_fontFaceValueCache.clear();
m_fontFamilyValueCache.clear();
}
}
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