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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 "LengthPoint.h"
#include "StylePosition.h"
#include "StyleValueTypes.h"
namespace WebCore {
class CSSValue;
class RenderStyle;
namespace Style {
class BuilderState;
// <'offset-position'> = auto | normal | <position>
// https://drafts.fxtf.org/motion/#propdef-offset-position
struct OffsetPosition {
OffsetPosition(CSS::Keyword::Auto) : value { WebCore::LengthType::Auto, WebCore::LengthType::Auto } { }
OffsetPosition(CSS::Keyword::Normal) : value { WebCore::LengthType::Normal, WebCore::LengthType::Normal } { }
OffsetPosition(Position&& position) : value { toPlatform(position) } { }
OffsetPosition(const Position& position) : value { toPlatform(position) } { }
explicit OffsetPosition(WebCore::LengthPoint&& point) : value { WTFMove(point) } { RELEASE_ASSERT(isValid(value)); }
explicit OffsetPosition(const WebCore::LengthPoint& point) : value { point } { RELEASE_ASSERT(isValid(value)); }
ALWAYS_INLINE bool isAuto() const { return value.x.isAuto(); }
ALWAYS_INLINE bool isNormal() const { return value.x.isNormal(); }
ALWAYS_INLINE bool isPosition() const { return value.x.isSpecified(); }
template<typename> bool holdsAlternative() const;
template<typename... F> decltype(auto) switchOn(F&&...) const;
bool operator==(const OffsetPosition&) const = default;
private:
friend struct Blending<OffsetPosition>;
friend struct ToPlatform<OffsetPosition>;
static bool isValid(const WebCore::LengthPoint& point)
{
return (point.x.isAuto() && point.y.isAuto())
|| (point.x.isNormal() && point.y.isNormal())
|| (point.x.isSpecified() && point.y.isSpecified());
}
WebCore::LengthPoint value;
};
template<typename T> bool OffsetPosition::holdsAlternative() const
{
if constexpr (std::same_as<T, CSS::Keyword::Auto>) return isAuto();
else if constexpr (std::same_as<T, CSS::Keyword::Normal>) return isNormal();
else if constexpr (std::same_as<T, Position>) return isPosition();
}
template<typename... F> decltype(auto) OffsetPosition::switchOn(F&&... f) const
{
auto visitor = WTF::makeVisitor(std::forward<F>(f)...);
if (isAuto())
return visitor(CSS::Keyword::Auto { });
if (isNormal())
return visitor(CSS::Keyword::Normal { });
return visitor(Position { value });
}
// 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: - Platform
template<> struct ToPlatform<OffsetPosition> { auto operator()(const OffsetPosition&) -> WebCore::LengthPoint; };
} // namespace Style
} // namespace WebCore
DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::OffsetPosition)
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