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/*
* Copyright (C) 2005-2023 Apple Inc. All rights reserved.
* Copyright (C) 2006 Alexey Proskuryakov
*
* 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.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE 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 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 "TextFlags.h"
#include <wtf/HashMap.h>
#include <wtf/HashTraits.h>
#include <wtf/Hasher.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/text/AtomString.h>
namespace WebCore {
class Font;
class FontDescription;
enum class IsForPlatformFont : bool;
struct CharacterFallbackMapKey {
AtomString locale;
String string;
bool isForPlatformFont { false };
ResolvedEmojiPolicy resolvedEmojiPolicy { ResolvedEmojiPolicy::NoPreference };
bool operator==(const CharacterFallbackMapKey& other) const = default;
};
inline void add(Hasher& hasher, const CharacterFallbackMapKey& key)
{
add(hasher, key.locale, key.string, key.isForPlatformFont, key.resolvedEmojiPolicy);
}
struct CharacterFallbackMapKeyHash {
static unsigned hash(const CharacterFallbackMapKey& key) { return computeHash(key); }
static bool equal(const CharacterFallbackMapKey& a, const CharacterFallbackMapKey& b) { return a == b; }
static const bool safeToCompareToEmptyOrDeleted = false;
};
class SystemFallbackFontCache {
WTF_MAKE_TZONE_ALLOCATED(SystemFallbackFontCache);
WTF_MAKE_NONCOPYABLE(SystemFallbackFontCache);
public:
static SystemFallbackFontCache& forCurrentThread();
static SystemFallbackFontCache* forCurrentThreadIfExists();
SystemFallbackFontCache() = default;
RefPtr<Font> systemFallbackFontForCharacterCluster(const Font*, StringView, const FontDescription&, ResolvedEmojiPolicy, IsForPlatformFont);
void remove(Font*);
private:
struct CharacterFallbackMapKeyHashTraits : SimpleClassHashTraits<CharacterFallbackMapKey> {
static void constructDeletedValue(CharacterFallbackMapKey& slot) { new (NotNull, &slot) CharacterFallbackMapKey { { }, WTF::HashTableDeletedValue, { } }; }
static bool isDeletedValue(const CharacterFallbackMapKey& key) { return key.string.isHashTableDeletedValue(); }
};
// Fonts are not ref'd to avoid cycles.
// FIXME: Consider changing these maps to use WeakPtr instead of raw pointers.
using CharacterFallbackMap = UncheckedKeyHashMap<CharacterFallbackMapKey, Font*, CharacterFallbackMapKeyHash, CharacterFallbackMapKeyHashTraits>;
UncheckedKeyHashMap<const Font*, CharacterFallbackMap> m_characterFallbackMaps;
};
} // namespace WebCore
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