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LibWeb: Special case SVG masks during layout

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

View file

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/*
* Copyright (c) 2024, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibWeb/Layout/SVGMaskBox.h>
#include <LibWeb/Painting/SVGMaskPaintable.h>
#include <LibWeb/Painting/StackingContext.h>
namespace Web::Layout {
SVGMaskBox::SVGMaskBox(DOM::Document& document, SVG::SVGMaskElement& element, NonnullRefPtr<CSS::StyleProperties> properties)
: SVGGraphicsBox(document, element, properties)
{
}
JS::GCPtr<Painting::Paintable> SVGMaskBox::create_paintable() const
{
return Painting::SVGMaskPaintable::create(*this);
}
}