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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/AcceleratedEffectOffsetPosition.h>
#include <WebCore/StylePosition.h>
#include <WebCore/StyleValueTypes.h>
namespace WebCore {
namespace Style {
// <'offset-position'> = auto | normal | <position>
// https://drafts.fxtf.org/motion/#propdef-offset-position
struct OffsetPosition {
OffsetPosition(CSS::Keyword::Auto keyword) : m_value { keyword} { }
OffsetPosition(CSS::Keyword::Normal keyword) : m_value { keyword} { }
OffsetPosition(Position&& position) : m_value { WTFMove(position) } { }
OffsetPosition(const Position& position) : m_value { position } { }
#if ENABLE(THREADED_ANIMATION_RESOLUTION)
explicit OffsetPosition(AcceleratedEffectOffsetPosition&& point) : m_value { convert(point) } { }
explicit OffsetPosition(const AcceleratedEffectOffsetPosition& point) : m_value { convert(point) } { }
#endif
ALWAYS_INLINE bool isAuto() const { return holdsAlternative<CSS::Keyword::Auto>(); }
ALWAYS_INLINE bool isNormal() const { return holdsAlternative<CSS::Keyword::Auto>(); }
ALWAYS_INLINE bool isPosition() const { return holdsAlternative<Position>(); }
std::optional<Position> tryPosition() const { return isPosition() ? std::make_optional(std::get<Position>(m_value)) : std::nullopt; }
template<typename> bool holdsAlternative() const;
template<typename... F> decltype(auto) switchOn(F&&...) const;
bool operator==(const OffsetPosition&) const = default;
private:
#if ENABLE(THREADED_ANIMATION_RESOLUTION)
static auto convert(const AcceleratedEffectOffsetPosition&) -> Variant<CSS::Keyword::Auto, CSS::Keyword::Normal, Position>;
#endif
Variant<CSS::Keyword::Auto, CSS::Keyword::Normal, Position> m_value;
};
template<typename T> bool OffsetPosition::holdsAlternative() const
{
return std::holds_alternative<T>(m_value);
}
template<typename... F> decltype(auto) OffsetPosition::switchOn(F&&... f) const
{
return WTF::switchOn(m_value, std::forward<F>(f)...);
}
// MARK: - Conversion
template<> struct CSSValueConversion<OffsetPosition> { auto operator()(BuilderState&, const CSSValue&) -> OffsetPosition; };
// MARK: - Blending
template<> struct Blending<OffsetPosition> {
auto canBlend(const OffsetPosition&, const OffsetPosition&) -> bool;
auto requiresInterpolationForAccumulativeIteration(const OffsetPosition&, const OffsetPosition&) -> bool;
auto blend(const OffsetPosition&, const OffsetPosition&, const BlendingContext&) -> OffsetPosition;
};
// MARK: - Evaluation
#if ENABLE(THREADED_ANIMATION_RESOLUTION)
template<> struct Evaluation<OffsetPosition, AcceleratedEffectOffsetPosition> {
auto operator()(const OffsetPosition&, FloatSize, ZoomNeeded) -> AcceleratedEffectOffsetPosition;
};
#endif
} // namespace Style
} // namespace WebCore
DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::OffsetPosition)
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