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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 <WebCore/StylePathOperationWrappers.h>
#include <WebCore/StyleValueTypes.h>
namespace WebCore {
namespace Style {
struct ClipPath;
struct OffsetPath;
// <'clip-path'> = none | <url> | [ <basic-shape> || <geometry-box> ]
struct ClipPath {
ClipPath(CSS::Keyword::None) : operation { nullptr } { }
ClipPath(ReferencePath&& reference) : operation { WTFMove(reference.operation) } { }
ClipPath(const ReferencePath& reference) : operation { reference.operation } { }
ClipPath(BasicShapePath&& basicShape) : operation { WTFMove(basicShape.operation) } { }
ClipPath(const BasicShapePath& basicShape) : operation { basicShape.operation } { }
ClipPath(BoxPath&& box) : operation { WTFMove(box.operation) } { }
ClipPath(const BoxPath& box) : operation { box.operation } { }
explicit ClipPath(RefPtr<PathOperation>&& operation) : operation { WTFMove(operation) } { RELEASE_ASSERT(isValid(operation)); }
explicit ClipPath(const RefPtr<PathOperation>& operation) : operation { operation } { RELEASE_ASSERT(isValid(operation)); }
bool isNone() const { return !operation; }
bool isReference() const { return is<ReferencePathOperation>(operation); }
bool isBasicShape() const { return is<ShapePathOperation>(operation); }
bool isBox() const { return is<BoxPathOperation>(operation); }
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 ClipPath& other) const
{
return arePointingToEqualData(operation, other.operation);
}
private:
friend struct Blending<ClipPath>;
friend CSSBoxType referenceBox(const ClipPath&);
friend std::optional<WebCore::Path> tryPath(const ClipPath&, const TransformOperationData&);
static bool isValid(RefPtr<PathOperation> operation)
{
return !operation || !is<RayPathOperation>(*operation);
}
RefPtr<PathOperation> operation;
};
inline std::optional<WebCore::Path> tryPath(const ClipPath& clipPath, const TransformOperationData& data)
{
RefPtr operation = clipPath.operation;
if (!operation)
return { };
return operation->getPath(data);
}
template<typename T> bool ClipPath::holdsAlternative() const
{
if constexpr (std::same_as<T, CSS::Keyword::None>) return isNone();
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) ClipPath::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:
break;
}
RELEASE_ASSERT_NOT_REACHED();
}
inline std::optional<ReferencePath> ClipPath::tryReference() const
{
if (RefPtr reference = dynamicDowncast<ReferencePathOperation>(operation))
return ReferencePath { reference.releaseNonNull() };
return { };
}
inline std::optional<BasicShapePath> ClipPath::tryBasicShape() const
{
if (RefPtr basicShape = dynamicDowncast<ShapePathOperation>(operation))
return BasicShapePath { basicShape.releaseNonNull() };
return { };
}
inline std::optional<BoxPath> ClipPath::tryBox() const
{
if (RefPtr box = dynamicDowncast<BoxPathOperation>(operation))
return BoxPath { box.releaseNonNull() };
return { };
}
// MARK: - Conversion
template<> struct CSSValueConversion<ClipPath> { auto operator()(BuilderState&, const CSSValue&) -> ClipPath; };
// MARK: - Blending
template<> struct Blending<ClipPath> {
auto canBlend(const ClipPath&, const ClipPath&) -> bool;
auto blend(const ClipPath&, const ClipPath&, const BlendingContext&) -> ClipPath;
};
} // namespace Style
} // namespace WebCore
DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::ClipPath)
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