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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
* Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
* Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc.
* All rights reserved.
* Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
* Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
* Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
* (http://www.torchmobile.com/)
* Copyright (c) 2011, Code Aurora Forum. All rights reserved.
* Copyright (C) Research In Motion Limited 2011. All rights reserved.
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "core/css/resolver/MatchedPropertiesCache.h"
#include "core/css/StylePropertySet.h"
#include "core/css/resolver/StyleResolverState.h"
#include "core/style/ComputedStyle.h"
namespace blink {
void CachedMatchedProperties::set(const ComputedStyle& style,
const ComputedStyle& parentStyle,
const MatchedPropertiesVector& properties) {
matchedProperties.appendVector(properties);
// Note that we don't cache the original ComputedStyle instance. It may be
// further modified. The ComputedStyle in the cache is really just a holder
// for the substructures and never used as-is.
this->computedStyle = ComputedStyle::clone(style);
this->parentComputedStyle = ComputedStyle::clone(parentStyle);
}
void CachedMatchedProperties::clear() {
matchedProperties.clear();
computedStyle = nullptr;
parentComputedStyle = nullptr;
}
MatchedPropertiesCache::MatchedPropertiesCache() {}
const CachedMatchedProperties* MatchedPropertiesCache::find(
unsigned hash,
const StyleResolverState& styleResolverState,
const MatchedPropertiesVector& properties) {
ASSERT(hash);
Cache::iterator it = m_cache.find(hash);
if (it == m_cache.end())
return nullptr;
CachedMatchedProperties* cacheItem = it->value.get();
ASSERT(cacheItem);
size_t size = properties.size();
if (size != cacheItem->matchedProperties.size())
return nullptr;
if (cacheItem->computedStyle->insideLink() !=
styleResolverState.style()->insideLink())
return nullptr;
for (size_t i = 0; i < size; ++i) {
if (properties[i] != cacheItem->matchedProperties[i])
return nullptr;
}
return cacheItem;
}
void MatchedPropertiesCache::add(const ComputedStyle& style,
const ComputedStyle& parentStyle,
unsigned hash,
const MatchedPropertiesVector& properties) {
ASSERT(hash);
Cache::AddResult addResult = m_cache.add(hash, nullptr);
if (addResult.isNewEntry)
addResult.storedValue->value = new CachedMatchedProperties;
CachedMatchedProperties* cacheItem = addResult.storedValue->value.get();
if (!addResult.isNewEntry)
cacheItem->clear();
cacheItem->set(style, parentStyle, properties);
}
void MatchedPropertiesCache::clear() {
// MatchedPropertiesCache must be cleared promptly because some
// destructors in the properties (e.g., ~FontFallbackList) expect that
// the destructors are called promptly without relying on a GC timing.
for (auto& cacheEntry : m_cache) {
cacheEntry.value->clear();
}
m_cache.clear();
}
void MatchedPropertiesCache::clearViewportDependent() {
Vector<unsigned, 16> toRemove;
for (const auto& cacheEntry : m_cache) {
CachedMatchedProperties* cacheItem = cacheEntry.value.get();
if (cacheItem->computedStyle->hasViewportUnits())
toRemove.push_back(cacheEntry.key);
}
m_cache.removeAll(toRemove);
}
bool MatchedPropertiesCache::isCacheable(const StyleResolverState& state) {
const ComputedStyle& style = *state.style();
const ComputedStyle& parentStyle = *state.parentStyle();
if (style.unique() ||
(style.styleType() != PseudoIdNone && parentStyle.unique()))
return false;
if (style.zoom() != ComputedStyle::initialZoom())
return false;
if (style.getWritingMode() != ComputedStyle::initialWritingMode() ||
style.direction() != ComputedStyle::initialDirection())
return false;
// The cache assumes static knowledge about which properties are inherited.
// Without a flat tree parent, StyleBuilder::applyProperty will not
// setHasExplicitlyInheritedProperties on the parent style.
if (!state.parentNode() || parentStyle.hasExplicitlyInheritedProperties())
return false;
if (style.hasVariableReferenceFromNonInheritedProperty())
return false;
return true;
}
DEFINE_TRACE(MatchedPropertiesCache) {
visitor->trace(m_cache);
}
} // namespace blink
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