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https://github.com/RGBCube/serenity
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163b6bb401
Rather than try to lay out masks normally, this updates the TreeBuilder to create layout nodes for masks as a child of their user (i.e. the masked element). This allows each use of a mask to be laid out differently, which makes supporting `maskContentUnits=objectBoundingBox` fairly easy. The `SVGFormattingContext` is then updated to lay out masks last (as their sizing may depend on their parent), and treats them like viewports. This is pretty ad-hoc, but the SVG specification does not give any guidance on how to actually implement this.
62 lines
1.9 KiB
C++
62 lines
1.9 KiB
C++
/*
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* Copyright (c) 2023, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2023, MacDue <macdue@dueutil.tech>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/Bindings/SVGMaskElementPrototype.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/SVG/AttributeNames.h>
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#include <LibWeb/SVG/SVGMaskElement.h>
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namespace Web::SVG {
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JS_DEFINE_ALLOCATOR(SVGMaskElement);
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SVGMaskElement::SVGMaskElement(DOM::Document& document, DOM::QualifiedName tag_name)
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: SVGGraphicsElement(document, move(tag_name))
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{
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}
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SVGMaskElement::~SVGMaskElement() = default;
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void SVGMaskElement::initialize(JS::Realm& realm)
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{
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Base::initialize(realm);
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set_prototype(&Bindings::ensure_web_prototype<Bindings::SVGMaskElementPrototype>(realm, "SVGMaskElement"_fly_string));
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}
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JS::GCPtr<Layout::Node> SVGMaskElement::create_layout_node(NonnullRefPtr<CSS::StyleProperties>)
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{
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// Masks are handled as a special case in the TreeBuilder.
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return nullptr;
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}
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void SVGMaskElement::attribute_changed(FlyString const& name, Optional<String> const& value)
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{
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SVGGraphicsElement::attribute_changed(name, value);
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if (name == AttributeNames::maskUnits) {
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m_mask_units = AttributeParser::parse_units(value.value_or(String {}));
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} else if (name == AttributeNames::maskContentUnits) {
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m_mask_content_units = AttributeParser::parse_units(value.value_or(String {}));
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}
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}
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MaskContentUnits SVGMaskElement::mask_content_units() const
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{
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return m_mask_content_units.value_or(MaskContentUnits::UserSpaceOnUse);
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}
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MaskUnits SVGMaskElement::mask_units() const
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{
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return m_mask_units.value_or(MaskUnits::ObjectBoundingBox);
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}
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CSSPixelRect SVGMaskElement::resolve_masking_area(CSSPixelRect const& mask_target) const
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{
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// TODO: Resolve this based on the x, y, width, and height of the mask.
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return mask_target.inflated(mask_target.size().scaled(CSSPixels(2) / 10));
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}
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}
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