/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. 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.
*
*/
#ifndef MatchedPropertiesCache_h
#define MatchedPropertiesCache_h
#include "core/css/resolver/MatchResult.h"
#include "platform/Timer.h"
#include "wtf/Forward.h"
#include "wtf/HashMap.h"
#include "wtf/Noncopyable.h"
namespace WebCore {
class RenderStyle;
class StyleResolverState;
struct CachedMatchedProperties {
Vector<MatchedProperties> matchedProperties;
MatchRanges ranges;
RefPtr<RenderStyle> renderStyle;
RefPtr<RenderStyle> parentRenderStyle;
void set(const RenderStyle*, const RenderStyle* parentStyle, const MatchResult&);
void clear();
};
class MatchedPropertiesCache {
WTF_MAKE_NONCOPYABLE(MatchedPropertiesCache);
public:
MatchedPropertiesCache();
const CachedMatchedProperties* find(unsigned hash, const StyleResolverState&, const MatchResult&);
void add(const RenderStyle*, const RenderStyle* parentStyle, unsigned hash, const MatchResult&);
void clear();
void clearViewportDependent();
static bool isCacheable(const Element*, const RenderStyle*, const RenderStyle* parentStyle);
private:
// Every N additions to the matched declaration cache trigger a sweep where entries holding
// the last reference to a style declaration are garbage collected.
void sweep(Timer<MatchedPropertiesCache>*);
unsigned m_additionsSinceLastSweep;
typedef HashMap<unsigned, OwnPtr<CachedMatchedProperties> > Cache;
Cache m_cache;
Timer<MatchedPropertiesCache> m_sweepTimer;
};
}
#endif