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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 THE COPYRIGHT HOLDER "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 THE COPYRIGHT HOLDER 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 "StylePathOperationWrappers.h"
#include "StyleValueTypes.h"
namespace WebCore {
namespace Style {
// <'offset-path'> = none | [ [ <ray()> | <url> | <basic-shape> ] || <coord-box> ]
// https://drafts.fxtf.org/motion-1/#propdef-offset-path
struct OffsetPath {
OffsetPath(CSS::Keyword::None) : operation { nullptr } { }
OffsetPath(RayPath&& ray) : operation { WTFMove(ray.operation) } { }
OffsetPath(const RayPath& ray) : operation { ray.operation } { }
OffsetPath(ReferencePath&& reference) : operation { WTFMove(reference.operation) } { }
OffsetPath(const ReferencePath& reference) : operation { reference.operation } { }
OffsetPath(BasicShapePath&& basicShape) : operation { WTFMove(basicShape.operation) } { }
OffsetPath(const BasicShapePath& basicShape) : operation { basicShape.operation } { }
OffsetPath(BoxPath&& box) : operation { WTFMove(box.operation) } { }
OffsetPath(const BoxPath& box) : operation { box.operation } { }
explicit OffsetPath(RefPtr<PathOperation>&& operation) : operation { WTFMove(operation) } { }
explicit OffsetPath(const RefPtr<PathOperation>& operation) : operation { operation } { }
bool isNone() const { return !operation; }
bool isRay() const { return is<RayPathOperation>(operation); }
bool isReference() const { return is<ReferencePathOperation>(operation); }
bool isBasicShape() const { return is<ShapePathOperation>(operation); }
bool isBox() const { return is<BoxPathOperation>(operation); }
std::optional<RayPath> tryRay() const;
std::optional<ReferencePath> tryReference() const;
std::optional<BasicShapePath> tryBasicShape() const;
std::optional<BoxPath> tryBox() const;
template<typename> bool holdsAlternative() const;
template<typename... F> decltype(auto) switchOn(F&&...) const;
bool operator==(const OffsetPath& other) const
{
return arePointingToEqualData(operation, other.operation);
}
private:
friend struct Blending<OffsetPath>;
friend struct ToPlatform<OffsetPath>;
friend std::optional<WebCore::Path> tryPath(const OffsetPath&, const TransformOperationData&);
RefPtr<PathOperation> operation;
};
inline std::optional<WebCore::Path> tryPath(const OffsetPath& offsetPath, const TransformOperationData& data)
{
RefPtr operation = offsetPath.operation;
if (!operation)
return { };
return operation->getPath(data);
}
template<typename T> bool OffsetPath::holdsAlternative() const
{
if constexpr (std::same_as<T, CSS::Keyword::None>) return isNone();
else if constexpr (std::same_as<T, RayPath>) return isRay();
else if constexpr (std::same_as<T, ReferencePath>) return isReference();
else if constexpr (std::same_as<T, BasicShapePath>) return isBasicShape();
else if constexpr (std::same_as<T, BoxPath>) return isBox();
}
template<typename... F> decltype(auto) OffsetPath::switchOn(F&&... f) const
{
auto visitor = WTF::makeVisitor(std::forward<F>(f)...);
if (!operation)
return visitor(CSS::Keyword::None { });
switch (operation->type()) {
case PathOperation::Type::Reference:
return visitor(ReferencePath { downcast<ReferencePathOperation>(*operation) });
case PathOperation::Type::Shape:
return visitor(BasicShapePath { downcast<ShapePathOperation>(*operation) });
case PathOperation::Type::Box:
return visitor(BoxPath { downcast<BoxPathOperation>(*operation) });
case PathOperation::Type::Ray:
return visitor(RayPath { downcast<RayPathOperation>(*operation) });
}
RELEASE_ASSERT_NOT_REACHED();
}
inline std::optional<RayPath> OffsetPath::tryRay() const
{
if (RefPtr ray = dynamicDowncast<RayPathOperation>(operation))
return RayPath { ray.releaseNonNull() };
return { };
}
inline std::optional<ReferencePath> OffsetPath::tryReference() const
{
if (RefPtr reference = dynamicDowncast<ReferencePathOperation>(operation))
return ReferencePath { reference.releaseNonNull() };
return { };
}
inline std::optional<BasicShapePath> OffsetPath::tryBasicShape() const
{
if (RefPtr basicShape = dynamicDowncast<ShapePathOperation>(operation))
return BasicShapePath { basicShape.releaseNonNull() };
return { };
}
inline std::optional<BoxPath> OffsetPath::tryBox() const
{
if (RefPtr box = dynamicDowncast<BoxPathOperation>(operation))
return BoxPath { box.releaseNonNull() };
return { };
}
// MARK: - Conversion
template<> struct CSSValueConversion<OffsetPath> { auto operator()(BuilderState&, const CSSValue&) -> OffsetPath; };
template<> struct CSSValueCreation<OffsetPath> { Ref<CSSValue> operator()(CSSValuePool&, const RenderStyle&, const OffsetPath&); };
// MARK: - Serialization
template<> struct Serialize<OffsetPath> { void operator()(StringBuilder&, const CSS::SerializationContext&, const RenderStyle&, const OffsetPath&); };
// MARK: - Blending
template<> struct Blending<OffsetPath> {
auto canBlend(const OffsetPath&, const OffsetPath&) -> bool;
auto blend(const OffsetPath&, const OffsetPath&, const BlendingContext&) -> OffsetPath;
};
// MARK: - Platform
template<> struct ToPlatform<OffsetPath> { auto operator()(const OffsetPath&) -> RefPtr<PathOperation>; };
} // namespace Style
} // namespace WebCore
DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::OffsetPath)
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