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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,
* 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/RenderStyleConstants.h>
#include <WebCore/StyleRatio.h>
namespace WebCore {
namespace Style {
using namespace CSS::Literals;
// <'aspect-ratio'> = auto || <ratio>
// https://drafts.csswg.org/css-sizing-4/#propdef-aspect-ratio
struct AspectRatio {
AspectRatio(CSS::Keyword::Auto)
: m_type { AspectRatioType::Auto }
, m_ratio { 0_css_number, 0_css_number }
{
}
AspectRatio(CSS::Keyword::Auto, Style::Ratio ratio)
: m_type { AspectRatioType::AutoAndRatio }
, m_ratio { ratio }
{
}
AspectRatio(Style::Ratio ratio)
: m_type { (!ratio.numerator.value || !ratio.denominator.value) ? AspectRatioType::AutoZero : AspectRatioType::Ratio }
, m_ratio { ratio }
{
}
bool isAuto() const { return m_type == AspectRatioType::Auto; }
bool isAutoAndRatio() const { return m_type == AspectRatioType::AutoAndRatio; }
bool isAutoZero() const { return m_type == AspectRatioType::AutoZero; }
bool isRatio() const { return m_type == AspectRatioType::Ratio; }
bool hasRatio() const { return isRatio() || isAutoAndRatio(); }
std::optional<Style::Ratio> tryRatio() const
{
if (isAuto())
return { };
return m_ratio;
}
Number<CSS::Nonnegative> width() const { return m_ratio.numerator; }
Number<CSS::Nonnegative> height() const { return m_ratio.denominator; }
template<typename... F> decltype(auto) switchOn(F&&... f) const
{
auto visitor = WTF::makeVisitor(std::forward<F>(f)...);
switch (m_type) {
case AspectRatioType::Auto:
return visitor(CSS::Keyword::Auto { });
case AspectRatioType::AutoZero:
case AspectRatioType::Ratio:
return visitor(m_ratio);
case AspectRatioType::AutoAndRatio:
return visitor(SpaceSeparatedTuple { CSS::Keyword::Auto { }, m_ratio });
}
RELEASE_ASSERT_NOT_REACHED();
}
bool operator==(const AspectRatio&) const = default;
private:
friend struct Blending<AspectRatio>;
AspectRatio(AspectRatioType type, Style::Ratio ratio)
: m_type { type }
, m_ratio { ratio }
{
}
AspectRatioType m_type;
Style::Ratio m_ratio;
};
// MARK: - Conversion
template<> struct CSSValueConversion<AspectRatio> { auto operator()(BuilderState&, const CSSValue&) -> AspectRatio; };
// MARK: - Blending
template<> struct Blending<AspectRatio> {
auto canBlend(const AspectRatio&, const AspectRatio&) -> bool;
auto blend(const AspectRatio&, const AspectRatio&, const RenderStyle&, const RenderStyle&, const BlendingContext&) -> AspectRatio;
};
} // namespace Style
} // namespace WebCore
DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::AspectRatio);
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