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/*
* Copyright (C) 2007 Nicholas Shanks <contact@nickshanks.com>
* Copyright (C) 2008-2023 Apple Inc. All rights reserved.
* Copyright (C) 2025 Samuel Weinig <sam@webkit.org>
*
* 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 "FontDescription.h"
#include "FontCascadeDescription.h"
#include "LocaleToScriptMapping.h"
#include <wtf/Language.h>
namespace WebCore {
FontDescription::FontDescription()
: m_variantAlternates(FontVariantAlternates::Normal())
, m_fontPalette({ FontPalette::Type::Normal, nullAtom() })
, m_fontSelectionRequest { normalWeightValue(), normalWidthValue(), std::nullopt }
, m_orientation(enumToUnderlyingType(FontOrientation::Horizontal))
, m_nonCJKGlyphOrientation(enumToUnderlyingType(NonCJKGlyphOrientation::Mixed))
, m_widthVariant(enumToUnderlyingType(FontWidthVariant::RegularWidth))
, m_textRendering(enumToUnderlyingType(TextRenderingMode::AutoTextRendering))
, m_script(USCRIPT_COMMON)
, m_fontSynthesisWeight(enumToUnderlyingType(FontSynthesisLonghandValue::Auto))
, m_fontSynthesisStyle(enumToUnderlyingType(FontSynthesisLonghandValue::Auto))
, m_fontSynthesisCaps(enumToUnderlyingType(FontSynthesisLonghandValue::Auto))
, m_variantCommonLigatures(enumToUnderlyingType(FontVariantLigatures::Normal))
, m_variantDiscretionaryLigatures(enumToUnderlyingType(FontVariantLigatures::Normal))
, m_variantHistoricalLigatures(enumToUnderlyingType(FontVariantLigatures::Normal))
, m_variantContextualAlternates(enumToUnderlyingType(FontVariantLigatures::Normal))
, m_variantPosition(enumToUnderlyingType(FontVariantPosition::Normal))
, m_variantCaps(enumToUnderlyingType(FontVariantCaps::Normal))
, m_variantNumericFigure(enumToUnderlyingType(FontVariantNumericFigure::Normal))
, m_variantNumericSpacing(enumToUnderlyingType(FontVariantNumericSpacing::Normal))
, m_variantNumericFraction(enumToUnderlyingType(FontVariantNumericFraction::Normal))
, m_variantNumericOrdinal(enumToUnderlyingType(FontVariantNumericOrdinal::Normal))
, m_variantNumericSlashedZero(enumToUnderlyingType(FontVariantNumericSlashedZero::Normal))
, m_variantEastAsianVariant(enumToUnderlyingType(FontVariantEastAsianVariant::Normal))
, m_variantEastAsianWidth(enumToUnderlyingType(FontVariantEastAsianWidth::Normal))
, m_variantEastAsianRuby(enumToUnderlyingType(FontVariantEastAsianRuby::Normal))
, m_variantEmoji(enumToUnderlyingType(FontVariantEmoji::Normal))
, m_opticalSizing(enumToUnderlyingType(FontOpticalSizing::Enabled))
, m_fontStyleAxis(enumToUnderlyingType(FontStyleAxis::slnt))
, m_shouldAllowUserInstalledFonts(enumToUnderlyingType(AllowUserInstalledFonts::No))
, m_shouldDisableLigaturesForSpacing(false)
, m_evaluationTimeZoomEnabled(false)
{
}
static AtomString computeSpecializedChineseLocale()
{
// FIXME: This is not passing ShouldMinimizeLanguages::No and then getting minimized languages,
// which may cause the matching below to fail.
for (auto& language : userPreferredLanguages()) {
if (startsWithLettersIgnoringASCIICase(language, "zh-"_s))
return AtomString { language };
}
return "zh-hans"_s; // We have no signal. Pick one option arbitrarily.
}
static AtomString& cachedSpecializedChineseLocale()
{
static MainThreadNeverDestroyed<AtomString> specializedChineseLocale;
return specializedChineseLocale.get();
}
static void fontDescriptionLanguageChanged(void*)
{
cachedSpecializedChineseLocale() = computeSpecializedChineseLocale();
}
static const AtomString& specializedChineseLocale()
{
auto& locale = cachedSpecializedChineseLocale();
if (cachedSpecializedChineseLocale().isNull()) {
static char forNonNullPointer;
addLanguageChangeObserver(&forNonNullPointer, &fontDescriptionLanguageChanged); // We will never remove the observer, so all we need is a non-null pointer.
fontDescriptionLanguageChanged(nullptr);
}
return locale;
}
void FontDescription::setSpecifiedLocale(const AtomString& locale)
{
ASSERT(isMainThread());
m_specifiedLocale = locale;
m_script = localeToScriptCode(m_specifiedLocale);
m_locale = m_script == USCRIPT_HAN ? specializedChineseLocale() : m_specifiedLocale;
}
#if !PLATFORM(COCOA)
AtomString FontDescription::platformResolveGenericFamily(UScriptCode, const AtomString&, const AtomString&)
{
return nullAtom();
}
#endif
float FontDescription::adjustedSizeForFontFace(float fontFaceSizeAdjust) const
{
// It is not worth modifying the used size with @font-face size-adjust if we are to re-adjust it later with font-size-adjust. This is because font-size-adjust will overrule this change, since size-adjust also modifies the font's metric values and thus, keeps the aspect-value unchanged.
return fontSizeAdjust().value ? computedSize() : fontFaceSizeAdjust * computedSize();
}
FontVariantEastAsianValues FontDescription::variantEastAsian() const
{
return {
variantEastAsianVariant(),
variantEastAsianWidth(),
variantEastAsianRuby(),
};
}
FontVariantNumericValues FontDescription::variantNumeric() const
{
return {
variantNumericFigure(),
variantNumericSpacing(),
variantNumericFraction(),
variantNumericOrdinal(),
variantNumericSlashedZero(),
};
}
FontVariantLigaturesValues FontDescription::variantLigatures() const
{
return {
variantCommonLigatures(),
variantDiscretionaryLigatures(),
variantHistoricalLigatures(),
variantContextualAlternates(),
};
}
FontVariantSettings FontDescription::variantSettings() const
{
return {
variantCommonLigatures(),
variantDiscretionaryLigatures(),
variantHistoricalLigatures(),
variantContextualAlternates(),
variantPosition(),
variantCaps(),
variantNumericFigure(),
variantNumericSpacing(),
variantNumericFraction(),
variantNumericOrdinal(),
variantNumericSlashedZero(),
variantAlternates(),
variantEastAsianVariant(),
variantEastAsianWidth(),
variantEastAsianRuby(),
variantEmoji()
};
}
void FontDescription::setVariantEastAsian(FontVariantEastAsianValues values)
{
setVariantEastAsianVariant(values.variant);
setVariantEastAsianWidth(values.width);
setVariantEastAsianRuby(values.ruby);
}
void FontDescription::setVariantNumeric(FontVariantNumericValues values)
{
setVariantNumericFigure(values.figure);
setVariantNumericSpacing(values.spacing);
setVariantNumericFraction(values.fraction);
setVariantNumericOrdinal(values.ordinal);
setVariantNumericSlashedZero(values.slashedZero);
}
void FontDescription::setVariantLigatures(FontVariantLigaturesValues values)
{
setVariantCommonLigatures(values.common);
setVariantDiscretionaryLigatures(values.discretionary);
setVariantHistoricalLigatures(values.historical);
setVariantContextualAlternates(values.contextual);
}
} // namespace WebCore
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