| /* |
| * 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 "config.h" |
| #include "core/css/resolver/MatchedPropertiesCache.h" |
| |
| #include "core/css/StylePropertySet.h" |
| #include "core/css/resolver/StyleResolverState.h" |
| #include "core/rendering/style/RenderStyle.h" |
| |
| namespace WebCore { |
| |
| void CachedMatchedProperties::set(const RenderStyle* style, const RenderStyle* parentStyle, const MatchResult& matchResult) |
| { |
| matchedProperties.append(matchResult.matchedProperties); |
| ranges = matchResult.ranges; |
| |
| // Note that we don't cache the original RenderStyle instance. It may be further modified. |
| // The RenderStyle in the cache is really just a holder for the substructures and never used as-is. |
| this->renderStyle = RenderStyle::clone(style); |
| this->parentRenderStyle = RenderStyle::clone(parentStyle); |
| } |
| |
| void CachedMatchedProperties::clear() |
| { |
| matchedProperties.clear(); |
| renderStyle = 0; |
| parentRenderStyle = 0; |
| } |
| |
| MatchedPropertiesCache::MatchedPropertiesCache() |
| : m_additionsSinceLastSweep(0) |
| , m_sweepTimer(this, &MatchedPropertiesCache::sweep) |
| { |
| } |
| |
| const CachedMatchedProperties* MatchedPropertiesCache::find(unsigned hash, const StyleResolverState& styleResolverState, const MatchResult& matchResult) |
| { |
| ASSERT(hash); |
| |
| Cache::iterator it = m_cache.find(hash); |
| if (it == m_cache.end()) |
| return 0; |
| CachedMatchedProperties* cacheItem = it->value.get(); |
| ASSERT(cacheItem); |
| |
| size_t size = matchResult.matchedProperties.size(); |
| if (size != cacheItem->matchedProperties.size()) |
| return 0; |
| if (cacheItem->renderStyle->insideLink() != styleResolverState.style()->insideLink()) |
| return 0; |
| for (size_t i = 0; i < size; ++i) { |
| if (matchResult.matchedProperties[i] != cacheItem->matchedProperties[i]) |
| return 0; |
| } |
| if (cacheItem->ranges != matchResult.ranges) |
| return 0; |
| return cacheItem; |
| } |
| |
| void MatchedPropertiesCache::add(const RenderStyle* style, const RenderStyle* parentStyle, unsigned hash, const MatchResult& matchResult) |
| { |
| static const unsigned maxAdditionsBetweenSweeps = 100; |
| if (++m_additionsSinceLastSweep >= maxAdditionsBetweenSweeps |
| && !m_sweepTimer.isActive()) { |
| static const unsigned sweepTimeInSeconds = 60; |
| m_sweepTimer.startOneShot(sweepTimeInSeconds); |
| } |
| |
| ASSERT(hash); |
| Cache::AddResult addResult = m_cache.add(hash, nullptr); |
| if (addResult.isNewEntry) |
| addResult.iterator->value = adoptPtr(new CachedMatchedProperties); |
| |
| CachedMatchedProperties* cacheItem = addResult.iterator->value.get(); |
| if (!addResult.isNewEntry) |
| cacheItem->clear(); |
| |
| cacheItem->set(style, parentStyle, matchResult); |
| } |
| |
| void MatchedPropertiesCache::clear() |
| { |
| m_cache.clear(); |
| } |
| |
| void MatchedPropertiesCache::sweep(Timer<MatchedPropertiesCache>*) |
| { |
| // Look for cache entries containing a style declaration with a single ref and remove them. |
| // This may happen when an element attribute mutation causes it to generate a new inlineStyle() |
| // or presentationAttributeStyle(), potentially leaving this cache with the last ref on the old one. |
| Vector<unsigned, 16> toRemove; |
| Cache::iterator it = m_cache.begin(); |
| Cache::iterator end = m_cache.end(); |
| for (; it != end; ++it) { |
| CachedMatchedProperties* cacheItem = it->value.get(); |
| Vector<MatchedProperties>& matchedProperties = cacheItem->matchedProperties; |
| for (size_t i = 0; i < matchedProperties.size(); ++i) { |
| if (matchedProperties[i].properties->hasOneRef()) { |
| toRemove.append(it->key); |
| break; |
| } |
| } |
| } |
| for (size_t i = 0; i < toRemove.size(); ++i) |
| m_cache.remove(toRemove[i]); |
| |
| m_additionsSinceLastSweep = 0; |
| } |
| |
| bool MatchedPropertiesCache::isCacheable(const Element* element, const RenderStyle* style, const RenderStyle* parentStyle) |
| { |
| // FIXME: CSSPropertyWebkitWritingMode modifies state when applying to document element. We can't skip the applying by caching. |
| if (element == element->document().documentElement() && element->document().writingModeSetOnDocumentElement()) |
| return false; |
| if (style->unique() || (style->styleType() != NOPSEUDO && parentStyle->unique())) |
| return false; |
| if (style->hasAppearance()) |
| return false; |
| if (style->zoom() != RenderStyle::initialZoom()) |
| return false; |
| if (style->writingMode() != RenderStyle::initialWritingMode()) |
| return false; |
| if (style->hasCurrentColor()) |
| return false; |
| // CSSPropertyInternalCallback sets the rule's selector name into the RenderStyle, and that's not recalculated if the RenderStyle is loaded from the cache, so don't cache it. |
| if (!style->callbackSelectors().isEmpty()) |
| return false; |
| // The cache assumes static knowledge about which properties are inherited. |
| if (parentStyle->hasExplicitlyInheritedProperties()) |
| return false; |
| if (RuntimeEnabledFeatures::webAnimationsEnabled()) { |
| if (style->transitions() && !style->transitions()->isEmpty()) |
| return false; |
| if (style->animations() && !style->animations()->isEmpty()) |
| return false; |
| } |
| return true; |
| } |
| |
| } |