mirror of
https://github.com/flutter/flutter.git
synced 2026-02-20 02:29:02 +08:00
96 lines
3.3 KiB
C++
96 lines
3.3 KiB
C++
/*
|
|
* 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/StylePropertySet.h"
|
|
#include "core/css/resolver/MatchResult.h"
|
|
#include "platform/Timer.h"
|
|
#include "platform/heap/Handle.h"
|
|
#include "wtf/Forward.h"
|
|
#include "wtf/HashMap.h"
|
|
#include "wtf/Noncopyable.h"
|
|
|
|
namespace blink {
|
|
|
|
class RenderStyle;
|
|
class StyleResolverState;
|
|
|
|
class CachedMatchedProperties FINAL : public NoBaseWillBeGarbageCollectedFinalized<CachedMatchedProperties> {
|
|
|
|
public:
|
|
WillBeHeapVector<MatchedProperties> matchedProperties;
|
|
MatchRanges ranges;
|
|
RefPtr<RenderStyle> renderStyle;
|
|
RefPtr<RenderStyle> parentRenderStyle;
|
|
|
|
void set(const RenderStyle*, const RenderStyle* parentStyle, const MatchResult&);
|
|
void clear();
|
|
void trace(Visitor* visitor) { visitor->trace(matchedProperties); }
|
|
};
|
|
|
|
// Specialize the HashTraits for CachedMatchedProperties to check for dead
|
|
// entries in the MatchedPropertiesCache.
|
|
#if ENABLE(OILPAN)
|
|
struct CachedMatchedPropertiesHashTraits : HashTraits<Member<CachedMatchedProperties> > {
|
|
static const WTF::WeakHandlingFlag weakHandlingFlag = WTF::WeakHandlingInCollections;
|
|
static bool traceInCollection(Visitor*, Member<CachedMatchedProperties>&, WTF::ShouldWeakPointersBeMarkedStrongly);
|
|
};
|
|
#endif
|
|
|
|
class MatchedPropertiesCache {
|
|
DISALLOW_ALLOCATION();
|
|
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);
|
|
|
|
void trace(Visitor*);
|
|
|
|
private:
|
|
#if ENABLE(OILPAN)
|
|
typedef HeapHashMap<unsigned, Member<CachedMatchedProperties>, DefaultHash<unsigned>::Hash, HashTraits<unsigned>, CachedMatchedPropertiesHashTraits > Cache;
|
|
#else
|
|
// 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;
|
|
Timer<MatchedPropertiesCache> m_sweepTimer;
|
|
#endif
|
|
Cache m_cache;
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|