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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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5
Userland/Libraries/LibWeb/SVG/SVGDefsElement.h
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@ -17,7 +17,10 @@ class SVGDefsElement final : public SVGGraphicsElement {
public:
virtual ~SVGDefsElement();
virtual JS::GCPtr<Layout::Node> create_layout_node(NonnullRefPtr<CSS::StyleProperties>) override;
virtual JS::GCPtr<Layout::Node> create_layout_node(NonnullRefPtr<CSS::StyleProperties>) override
{
return nullptr;
}
private:
SVGDefsElement(DOM::Document&, DOM::QualifiedName);