blob: 7b748615b0c7f98575f5d39b751053e4bf6f20b0 [file] [log] [blame]
/*
* Copyright (C) 2019 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.
*/
#pragma once
#include "MatchResult.h"
#include "RenderStyle.h"
#include "Timer.h"
namespace WebCore {
namespace Style {
class MatchedDeclarationsCache {
WTF_MAKE_FAST_ALLOCATED;
public:
MatchedDeclarationsCache();
~MatchedDeclarationsCache();
static bool isCacheable(const Element&, const RenderStyle&, const RenderStyle& parentStyle);
static unsigned computeHash(const MatchResult&);
struct Entry {
MatchResult matchResult;
std::unique_ptr<const RenderStyle> renderStyle;
std::unique_ptr<const RenderStyle> parentRenderStyle;
bool isUsableAfterHighPriorityProperties(const RenderStyle&) const;
};
const Entry* find(unsigned hash, const MatchResult&);
void add(const RenderStyle&, const RenderStyle& parentStyle, unsigned hash, const MatchResult&);
// 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 invalidate();
void clearEntriesAffectedByViewportUnits();
private:
void sweep();
HashMap<unsigned, Entry> m_entries;
Timer m_sweepTimer;
unsigned m_additionsSinceLastSweep { 0 };
};
}
}