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119 lines
4.2 KiB
C++
119 lines
4.2 KiB
C++
/*
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* Copyright (c) 2025, Sam Atkins <sam@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "CSSSkewX.h"
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#include <LibWeb/Bindings/CSSSkewXPrototype.h>
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#include <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/CSS/CSSNumericValue.h>
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#include <LibWeb/CSS/CSSUnitValue.h>
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#include <LibWeb/CSS/PropertyNameAndID.h>
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#include <LibWeb/CSS/StyleValues/TransformationStyleValue.h>
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#include <LibWeb/Geometry/DOMMatrix.h>
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#include <LibWeb/WebIDL/ExceptionOr.h>
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namespace Web::CSS {
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GC_DEFINE_ALLOCATOR(CSSSkewX);
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GC::Ref<CSSSkewX> CSSSkewX::create(JS::Realm& realm, GC::Ref<CSSNumericValue> ax)
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{
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return realm.create<CSSSkewX>(realm, ax);
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#dom-cssskewx-cssskewx
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WebIDL::ExceptionOr<GC::Ref<CSSSkewX>> CSSSkewX::construct_impl(JS::Realm& realm, GC::Ref<CSSNumericValue> ax)
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{
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// The CSSSkewX(ax) constructor must, when invoked, perform the following steps:
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// 1. If ax does not match <angle>, throw a TypeError.
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if (!ax->type().matches_angle({}))
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return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, "CSSSkewX ax component doesn't match <angle>"sv };
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// 2. Return a new CSSSkewX object with its ax internal slot set to ax, and its is2D internal slot set to true.
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return CSSSkewX::create(realm, ax);
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}
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CSSSkewX::CSSSkewX(JS::Realm& realm, GC::Ref<CSSNumericValue> ax)
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: CSSTransformComponent(realm, Is2D::Yes)
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, m_ax(ax)
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{
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}
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CSSSkewX::~CSSSkewX() = default;
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void CSSSkewX::initialize(JS::Realm& realm)
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{
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WEB_SET_PROTOTYPE_FOR_INTERFACE(CSSSkewX);
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Base::initialize(realm);
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}
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void CSSSkewX::visit_edges(Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_ax);
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#serialize-a-cssskewx
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WebIDL::ExceptionOr<Utf16String> CSSSkewX::to_string() const
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{
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// 1. Let s initially be "skewX(".
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StringBuilder builder { StringBuilder::Mode::UTF16 };
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builder.append("skewX("sv);
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// 2. Serialize this’s ax internal slot, and append it to s.
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builder.append(TRY(m_ax->to_string()));
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// 3. Append ")" to s, and return s.
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builder.append(")"sv);
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return builder.to_utf16_string();
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#dom-csstransformcomponent-tomatrix
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WebIDL::ExceptionOr<GC::Ref<Geometry::DOMMatrix>> CSSSkewX::to_matrix() const
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{
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// 1. Let matrix be a new DOMMatrix object, initialized to this’s equivalent 4x4 transform matrix, as defined in
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// CSS Transforms 1 § 12. Mathematical Description of Transform Functions, and with its is2D internal slot set
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// to the same value as this’s is2D internal slot.
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// NOTE: Recall that the is2D flag affects what transform, and thus what equivalent matrix, a
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// CSSTransformComponent represents.
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// As the entries of such a matrix are defined relative to the px unit, if any <length>s in this involved in
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// generating the matrix are not compatible units with px (such as relative lengths or percentages), throw a
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// TypeError.
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auto matrix = Geometry::DOMMatrix::create(realm());
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// NB: to() throws a TypeError if the conversion can't be done.
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auto ax_rad = TRY(m_ax->to("rad"_fly_string))->value();
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matrix->set_m21(tanf(ax_rad));
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// 2. Return matrix.
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return matrix;
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}
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WebIDL::ExceptionOr<void> CSSSkewX::set_ax(GC::Ref<CSSNumericValue> ax)
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{
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// AD-HOC: Not specced. https://github.com/w3c/css-houdini-drafts/issues/1153
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// WPT expects this to throw for invalid values.
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if (!ax->type().matches_angle({}))
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return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, "CSSSkewX ax component doesn't match <angle>"sv };
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m_ax = ax;
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return {};
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#dom-cssskew-is2d
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void CSSSkewX::set_is_2d(bool)
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{
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// The is2D attribute of a CSSSkewX, CSSSkewXX, or CSSSkewXY object must, on setting, do nothing.
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}
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WebIDL::ExceptionOr<NonnullRefPtr<TransformationStyleValue const>> CSSSkewX::create_style_value(PropertyNameAndID const& property) const
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{
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return TransformationStyleValue::create(property.id(), TransformFunction::SkewX,
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{
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TRY(m_ax->create_an_internal_representation(property, CSSStyleValue::PerformTypeCheck::No)),
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});
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}
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}
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