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LibWeb: Special case SVG masks during layout

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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.
This commit is contained in:
MacDue 2024-03-11 18:26:58 +00:00 • committed by Andreas Kling
parent 15e3b0ebde
commit 163b6bb401
18 changed files with 232 additions and 76 deletions
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6
Userland/Libraries/LibWeb/SVG/SVGMaskElement.cpp
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@ -7,7 +7,6 @@
#include <LibWeb/Bindings/SVGMaskElementPrototype.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/Layout/SVGGraphicsBox.h>
#include <LibWeb/SVG/AttributeNames.h>
#include <LibWeb/SVG/SVGMaskElement.h>
@ -28,9 +27,10 @@ void SVGMaskElement::initialize(JS::Realm& realm)
set_prototype(&Bindings::ensure_web_prototype<Bindings::SVGMaskElementPrototype>(realm, "SVGMaskElement"_fly_string));
}
JS::GCPtr<Layout::Node> SVGMaskElement::create_layout_node(NonnullRefPtr<CSS::StyleProperties> style)
JS::GCPtr<Layout::Node> SVGMaskElement::create_layout_node(NonnullRefPtr<CSS::StyleProperties>)
{
return heap().allocate_without_realm<Layout::SVGGraphicsBox>(document(), *this, move(style));
// Masks are handled as a special case in the TreeBuilder.
return nullptr;
}
void SVGMaskElement::attribute_changed(FlyString const& name, Optional<String> const& value)