97 lines
3.1 KiB
C++
97 lines
3.1 KiB
C++
/*
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* Copyright (C) 2018-2021 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "FontCascade.h"
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#include "InMemoryDisplayList.h"
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#include "Logging.h"
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#include "TextRun.h"
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#include <wtf/HashMap.h>
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#include <wtf/MemoryPressureHandler.h>
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#include <wtf/NeverDestroyed.h>
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namespace WebCore {
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template<typename LayoutRun>
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class GlyphDisplayListCache {
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public:
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GlyphDisplayListCache() = default;
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static GlyphDisplayListCache& singleton()
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{
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static NeverDestroyed<GlyphDisplayListCache> cache;
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return cache;
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}
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DisplayList::DisplayList* get(const LayoutRun& run, const FontCascade& font, GraphicsContext& context, const TextRun& textRun)
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{
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if (MemoryPressureHandler::singleton().isUnderMemoryPressure()) {
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if (!m_glyphRunMap.isEmpty()) {
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LOG(MemoryPressure, "GlyphDisplayListCache::%s - Under memory pressure - size: %d - sizeInBytes: %ld", __FUNCTION__, size(), sizeInBytes());
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clear();
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}
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return nullptr;
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}
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if (auto displayList = m_glyphRunMap.get(&run))
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return displayList;
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if (auto displayList = font.displayListForTextRun(context, textRun))
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return m_glyphRunMap.add(&run, WTFMove(displayList)).iterator->value.get();
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return nullptr;
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}
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void remove(const LayoutRun& run)
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{
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m_glyphRunMap.remove(&run);
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}
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void clear()
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{
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m_glyphRunMap.clear();
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}
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unsigned size() const
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{
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return m_glyphRunMap.size();
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}
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size_t sizeInBytes() const
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{
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size_t sizeInBytes = 0;
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for (const auto& entry : m_glyphRunMap)
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sizeInBytes += entry.value->sizeInBytes();
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return sizeInBytes;
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}
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private:
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using GlyphRunMap = HashMap<const LayoutRun*, std::unique_ptr<DisplayList::InMemoryDisplayList>>;
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GlyphRunMap m_glyphRunMap;
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};
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}
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