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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/StyleScaleTransformFunction.h>
#include <WebCore/StyleTransformFunctionWrapper.h>
namespace WebCore {
namespace Style {
// <'scale'> = none | [ <number> | <percentage> ]{1,3}
// https://drafts.csswg.org/css-transforms-2/#propdef-scale
struct Scale {
struct Function : TransformFunctionWrapper<ScaleTransformFunction> {
using TransformFunctionWrapper<ScaleTransformFunction>::TransformFunctionWrapper;
template<typename... F> decltype(auto) switchOn(F&&...) const;
};
Scale(CSS::Keyword::None) : value { nullptr } { }
Scale(Function&& value) : value { WTFMove(value.value) } { }
Scale(Ref<const ScaleTransformFunction>&& value) : value { WTFMove(value) } { }
bool affectedByTransformOrigin() const { return value && !value->isIdentity(); }
bool isRepresentableIn2D() const { return !value || value->isRepresentableIn2D(); }
bool is3DOperation() const { return value && value->is3DOperation(); }
void apply(TransformationMatrix&, const FloatSize&) const;
bool isNone() const { return !value; }
bool isFunction() const { return !!value; }
template<typename> bool holdsAlternative() const;
template<typename... F> decltype(auto) switchOn(F&&...) const;
bool operator==(const Scale& other) const
{
return arePointingToEqualData(value, other.value);
}
private:
friend struct Blending<Scale>;
friend struct ToPlatform<Scale>;
RefPtr<const ScaleTransformFunction> value;
};
// MARK: Scale Function
template<typename... F> decltype(auto) Scale::Function::switchOn(F&&... f) const
{
auto visitor = WTF::makeVisitor(std::forward<F>(f)...);
Ref protectedValue = value;
if (protectedValue->z() != 1)
return visitor(SpaceSeparatedTuple { protectedValue->x(), protectedValue->y(), protectedValue->z() });
if (protectedValue->x() != protectedValue->y())
return visitor(SpaceSeparatedTuple { protectedValue->x(), protectedValue->y() });
return visitor(protectedValue->x());
}
// MARK: Scale
template<typename T> bool Scale::holdsAlternative() const
{
if constexpr (std::same_as<T, CSS::Keyword::None>) return isNone();
else if constexpr (std::same_as<T, Function>) return isFunction();
}
template<typename... F> decltype(auto) Scale::switchOn(F&&... f) const
{
auto visitor = WTF::makeVisitor(std::forward<F>(f)...);
if (!value)
return visitor(CSS::Keyword::None { });
return visitor(Function { *value });
}
// MARK: - Conversion
template<> struct CSSValueConversion<Scale> { auto operator()(BuilderState&, const CSSValue&) -> Scale; };
// MARK: - Blending
template<> struct Blending<Scale> {
auto blend(const Scale&, const Scale&, const BlendingContext&) -> Scale;
};
// MARK: - Platform
template<> struct ToPlatform<Scale> { auto operator()(const Scale&, const FloatSize&) -> RefPtr<TransformOperation>; };
} // namespace Style
} // namespace WebCore
DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::Scale::Function)
DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::Scale)
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