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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.
*/
#include "config.h"
#include "SystemFallbackFontCache.h"
#include "FontCache.h"
#include "FontCascade.h"
#include <wtf/unicode/CharacterNames.h>
namespace WebCore {
SystemFallbackFontCache& SystemFallbackFontCache::forCurrentThread()
{
return FontCache::forCurrentThread().systemFallbackFontCache();
}
RefPtr<Font> SystemFallbackFontCache::systemFallbackFontForCharacter(const Font* font, UChar32 character, const FontDescription& description, ResolvedEmojiPolicy resolvedEmojiPolicy, IsForPlatformFont isForPlatformFont)
{
auto fontAddResult = m_characterFallbackMaps.add(font, CharacterFallbackMap());
if (!character) {
UChar codeUnit = 0;
return FontCache::forCurrentThread().systemFallbackForCharacters(description, *font, isForPlatformFont, FontCache::PreferColoredFont::No, &codeUnit, 1);
}
auto key = CharacterFallbackMapKey { description.computedLocale(), character, isForPlatformFont != IsForPlatformFont::No, resolvedEmojiPolicy };
return fontAddResult.iterator->value.ensure(WTFMove(key), [&] {
UChar codeUnits[3];
unsigned codeUnitsLength;
if (U_IS_BMP(character)) {
codeUnits[0] = FontCascade::normalizeSpaces(character);
codeUnitsLength = 1;
} else {
codeUnits[0] = U16_LEAD(character);
codeUnits[1] = U16_TRAIL(character);
codeUnitsLength = 2;
}
// FIXME: Is this the right place to add the variation selectors?
// Should this be done in platform-specific code instead?
// The fact that Core Text accepts this information in the form of variation selectors
// seems like a platform-specific quirk.
// However, if we do this later in platform-specific code, we'd have to reallocate
// the array and copy its contents, which seems wasteful.
switch (resolvedEmojiPolicy) {
case ResolvedEmojiPolicy::NoPreference:
break;
case ResolvedEmojiPolicy::RequireText:
codeUnits[codeUnitsLength++] = textVariationSelector;
break;
case ResolvedEmojiPolicy::RequireEmoji:
codeUnits[codeUnitsLength++] = emojiVariationSelector;
break;
}
auto fallbackFont = FontCache::forCurrentThread().systemFallbackForCharacters(description, *font, isForPlatformFont, FontCache::PreferColoredFont::No, codeUnits, codeUnitsLength).get();
if (fallbackFont)
fallbackFont->setIsUsedInSystemFallbackFontCache();
return fallbackFont;
}).iterator->value;
}
void SystemFallbackFontCache::remove(Font* font)
{
m_characterFallbackMaps.remove(font);
if (!font->isUsedInSystemFallbackFontCache())
return;
for (auto& characterMap : m_characterFallbackMaps.values()) {
Vector<CharacterFallbackMapKey, 512> toRemove;
for (auto& entry : characterMap) {
if (entry.value == font)
toRemove.append(entry.key);
}
for (auto& key : toRemove)
characterMap.remove(key);
}
}
} // namespace WebCore
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