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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 "CSSPrimitiveValueMappings.h"
#include "CSSPropertyParser.h"
#include "CSSValueKeywords.h"
#include "CSSValueList.h"
namespace WebCore {
DEFINE_ALLOCATOR_WITH_HEAP_IDENTIFIER(CSSValuePool);
LazyNeverDestroyed<StaticCSSValuePool> staticCSSValuePool;
StaticCSSValuePool::StaticCSSValuePool()
: m_implicitInitialValue(CSSValue::StaticCSSValue, CSSPrimitiveValue::ImplicitInitialValue)
, m_transparentColor(CSSValue::StaticCSSValue, WebCore::Color::transparentBlack)
, m_whiteColor(CSSValue::StaticCSSValue, WebCore::Color::white)
, m_blackColor(CSSValue::StaticCSSValue, WebCore::Color::black)
{
for (auto keyword : allCSSValueKeywords())
new (m_identifierValues[enumToUnderlyingType(keyword)].get()) CSSPrimitiveValue { CSSValue::StaticCSSValue, keyword };
for (unsigned i = 0; i <= maximumCacheableIntegerValue; ++i) {
new (m_pixelValues[i].get()) CSSPrimitiveValue(CSSValue::StaticCSSValue, i, CSSUnitType::CSS_PX);
new (m_percentageValues[i].get()) CSSPrimitiveValue(CSSValue::StaticCSSValue, i, CSSUnitType::CSS_PERCENTAGE);
new (m_numberValues[i].get()) CSSPrimitiveValue(CSSValue::StaticCSSValue, i, CSSUnitType::CSS_NUMBER);
}
}
void StaticCSSValuePool::init()
{
static std::once_flag onceKey;
std::call_once(onceKey, []() {
staticCSSValuePool.construct();
});
}
CSSValuePool::CSSValuePool() = default;
// FIXME: This function needs a name that make it clear that this is not the one and only CSSValuePool, rather the one that can be used only on the main thread.
// FIXME: Consider a design where the value pool thread-local storage so callers don't have to deal directly with the value pool at all.
CSSValuePool& CSSValuePool::singleton()
{
static MainThreadNeverDestroyed<CSSValuePool> pool;
return pool;
}
Ref<CSSColorValue> CSSValuePool::createColorValue(const WebCore::Color& color)
{
// These are the empty and deleted values of the hash table.
if (color == WebCore::Color::transparentBlack)
return staticCSSValuePool->m_transparentColor;
if (color == WebCore::Color::white)
return staticCSSValuePool->m_whiteColor;
// Just because it is common.
if (color == WebCore::Color::black)
return staticCSSValuePool->m_blackColor;
// 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 CSSColorValue::create(color);
}).iterator->value;
}
Ref<CSSPrimitiveValue> CSSValuePool::createFontFamilyValue(const AtomString& familyName)
{
// 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());
return m_fontFamilyValueCache.ensure(familyName, [&familyName] {
return CSSPrimitiveValue::createFontFamily(familyName);
}).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 value = CSSPropertyParser::parseStylePropertyLonghand(CSSPropertyFontFamily, string, strictCSSParserContext());
return dynamicDowncast<CSSValueList>(value.get());
}).iterator->value;
}
void CSSValuePool::drain()
{
m_colorValueCache.clear();
m_fontFaceValueCache.clear();
m_fontFamilyValueCache.clear();
}
}
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