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/*
* Copyright (C) 2018-2022 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. ``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
* 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 "DisplayList.h"
#include "FloatSizeHash.h"
#include "FontCascade.h"
#include "InMemoryDisplayList.h"
#include "Logging.h"
#include "TextRun.h"
#include "TextRunHash.h"
#include <wtf/HashMap.h>
#include <wtf/MemoryPressureHandler.h>
#include <wtf/NeverDestroyed.h>
namespace WebCore {
class LegacyInlineTextBox;
namespace InlineDisplay {
struct Box;
}
class GlyphDisplayListCacheEntry : public RefCounted<GlyphDisplayListCacheEntry>, public CanMakeWeakPtr<GlyphDisplayListCacheEntry> {
WTF_MAKE_FAST_ALLOCATED;
friend struct GlyphDisplayListCacheKeyTranslator;
friend void add(Hasher&, const GlyphDisplayListCacheEntry&);
public:
static Ref<GlyphDisplayListCacheEntry> create(std::unique_ptr<DisplayList::InMemoryDisplayList>&& displayList, const TextRun& textRun, const FontCascade& font, GraphicsContext& context)
{
return adoptRef(*new GlyphDisplayListCacheEntry(WTFMove(displayList), textRun, font, context));
}
~GlyphDisplayListCacheEntry();
bool operator==(const GlyphDisplayListCacheEntry& other) const
{
return m_textRun == other.m_textRun
&& m_scaleFactor == other.m_scaleFactor
&& m_fontCascadeGeneration == other.m_fontCascadeGeneration
&& m_shouldSubpixelQuantizeFont == other.m_shouldSubpixelQuantizeFont;
}
DisplayList::InMemoryDisplayList& displayList() { return *m_displayList.get(); }
private:
GlyphDisplayListCacheEntry(std::unique_ptr<DisplayList::InMemoryDisplayList>&& displayList, const TextRun& textRun, const FontCascade& font, GraphicsContext& context)
: m_displayList(WTFMove(displayList))
, m_textRun(textRun.isolatedCopy())
, m_scaleFactor(context.scaleFactor())
, m_fontCascadeGeneration(font.generation())
, m_shouldSubpixelQuantizeFont(context.shouldSubpixelQuantizeFonts())
{
ASSERT(m_displayList.get());
}
std::unique_ptr<DisplayList::InMemoryDisplayList> m_displayList;
TextRun m_textRun;
FloatSize m_scaleFactor;
unsigned m_fontCascadeGeneration;
bool m_shouldSubpixelQuantizeFont;
};
inline void add(Hasher& hasher, const GlyphDisplayListCacheEntry& entry)
{
add(hasher, entry.m_textRun, entry.m_scaleFactor.width(), entry.m_scaleFactor.height(), entry.m_fontCascadeGeneration, entry.m_shouldSubpixelQuantizeFont);
}
struct GlyphDisplayListCacheEntryHash {
static unsigned hash(GlyphDisplayListCacheEntry* entry) { return computeHash(*entry); }
static bool equal(GlyphDisplayListCacheEntry* a, GlyphDisplayListCacheEntry* b) { return a == b; }
static constexpr bool safeToCompareToEmptyOrDeleted = false;
};
class GlyphDisplayListCache {
WTF_MAKE_FAST_ALLOCATED;
friend class GlyphDisplayListCacheEntry;
public:
GlyphDisplayListCache() = default;
static GlyphDisplayListCache& singleton();
DisplayList::DisplayList* get(const LegacyInlineTextBox& run, const FontCascade& font, GraphicsContext& context, const TextRun& textRun) { return get(&run, font, context, textRun); }
DisplayList::DisplayList* get(const InlineDisplay::Box& run, const FontCascade& font, GraphicsContext& context, const TextRun& textRun) { return get(&run, font, context, textRun); }
DisplayList::DisplayList* getIfExists(const LegacyInlineTextBox& run) { return getIfExists(&run); }
DisplayList::DisplayList* getIfExists(const InlineDisplay::Box& run) { return getIfExists(&run); }
void remove(const LegacyInlineTextBox& run) { remove(&run); }
void remove(const InlineDisplay::Box& run) { remove(&run); }
void clear();
unsigned size() const;
size_t sizeInBytes() const;
private:
static bool canShareDisplayList(const DisplayList::InMemoryDisplayList&);
DisplayList::DisplayList* get(const void* run, const FontCascade&, GraphicsContext&, const TextRun&);
DisplayList::DisplayList* getIfExists(const void* run);
void remove(const void* run);
HashMap<const void*, Ref<GlyphDisplayListCacheEntry>> m_entriesForLayoutRun;
HashSet<GlyphDisplayListCacheEntry*> m_entries;
};
} // namespace WebCore
namespace WTF {
template<> struct DefaultHash<WebCore::GlyphDisplayListCacheEntry*> : WebCore::GlyphDisplayListCacheEntryHash { };
} // namespace WTF
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