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/*
* 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.
*
* 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 <WebCore/FontSelectionAlgorithm.h>
#include <WebCore/StylePrimitiveNumericTypes.h>
namespace WebCore {
namespace Style {
// <'font-style'> = normal | italic | oblique <angle [-90deg,90deg]>?
// https://drafts.csswg.org/css-fonts-4/#propdef-font-style
struct FontStyle {
using Angle = Style::Angle<CSS::Range{-90, 90}>;
FontStyle(CSS::Keyword::Normal) : m_platformSlope { std::nullopt }, m_platformAxis { FontStyleAxis::slnt } { }
FontStyle(CSS::Keyword::Italic) : m_platformSlope { italicValue() }, m_platformAxis { FontStyleAxis::ital } { }
FontStyle(CSS::Keyword::Oblique) : m_platformSlope { italicValue() }, m_platformAxis { FontStyleAxis::slnt } { }
FontStyle(Angle angle) : m_platformSlope { FontSelectionValue::clampFloat(angle.value) }, m_platformAxis { FontStyleAxis::slnt } { }
FontStyle(std::optional<FontSelectionValue> slope, FontStyleAxis axis) : m_platformSlope { slope }, m_platformAxis { axis } { }
bool isNormal() const { return m_platformSlope == std::nullopt && m_platformAxis == FontStyleAxis::slnt; }
bool isItalic() const { return m_platformSlope == italicValue() && m_platformAxis == FontStyleAxis::ital; }
bool isOblique() const { return m_platformSlope != std::nullopt && m_platformAxis == FontStyleAxis::slnt; }
std::optional<Angle> angle() const { return m_platformSlope ? std::make_optional(Angle { static_cast<float>(*m_platformSlope) }) : std::nullopt; }
template<typename... F> decltype(auto) switchOn(F&&... f) const
{
auto visitor = WTF::makeVisitor(std::forward<F>(f)...);
if (!m_platformSlope || !*m_platformSlope)
return visitor(CSS::Keyword::Normal { });
if (*m_platformSlope == italicValue()) {
if (m_platformAxis == FontStyleAxis::ital)
return visitor(CSS::Keyword::Italic { });
return visitor(CSS::Keyword::Oblique { });
}
return visitor(SpaceSeparatedTuple { CSS::Keyword::Oblique { }, Angle { static_cast<float>(*m_platformSlope) } });
}
std::optional<FontSelectionValue> platformSlope() const { return m_platformSlope; }
FontStyleAxis platformAxis() const { return m_platformAxis; }
// NOTE: This is not if the value would compute to the keyword `italic`, but rather a more general whether the slope is large enough to be considered "italic" (see `WebCore::italicThreshold()`).
bool isConsideredItalic() const { return WebCore::isItalic(m_platformSlope); }
bool operator==(const FontStyle&) const = default;
private:
std::optional<FontSelectionValue> m_platformSlope;
FontStyleAxis m_platformAxis;
};
// MARK: - Conversion
template<> struct CSSValueConversion<FontStyle> { auto operator()(BuilderState&, const CSSValue&) -> FontStyle; };
// `FontStyle` is special-cased to return a `CSSFontStyleWithAngleValue`.
template<> struct CSSValueCreation<FontStyle> { auto operator()(CSSValuePool&, const RenderStyle&, const FontStyle&) -> Ref<CSSValue>; };
// MARK: - Blending
template<> struct Blending<FontStyle> {
auto canBlend(const FontStyle&, const FontStyle&) -> bool;
auto blend(const FontStyle&, const FontStyle&, const BlendingContext&) -> FontStyle;
};
} // namespace Style
} // namespace WebCore
DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::FontStyle)
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