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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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20
Userland/Libraries/LibWeb/SVG/SVGMaskElement.h
View file

@ -8,16 +8,34 @@
#include <LibWeb/SVG/AttributeParser.h>
#include <LibWeb/SVG/SVGGraphicsElement.h>
#include <LibWeb/SVG/SVGViewport.h>
namespace Web::SVG {
class SVGMaskElement final : public SVGGraphicsElement {
class SVGMaskElement final : public SVGGraphicsElement
, public SVGViewport {
WEB_PLATFORM_OBJECT(SVGMaskElement, SVGGraphicsElement);
JS_DECLARE_ALLOCATOR(SVGMaskElement);
public:
virtual ~SVGMaskElement() override;
virtual Optional<ViewBox> view_box() const override
{
// maskContentUnits = objectBoundingBox acts like the mask is sized to the bounding box
// of the target element, with a viewBox of "0 0 1 1".
if (mask_content_units() == MaskContentUnits::ObjectBoundingBox)
return ViewBox { 0, 0, 1, 1 };
return {};
}
virtual Optional<PreserveAspectRatio> preserve_aspect_ratio() const override
{
// preserveAspectRatio = none (allow mask to be scaled in both x and y to match target size)
return PreserveAspectRatio { PreserveAspectRatio::Align::None, {} };
}
virtual void attribute_changed(FlyString const& name, Optional<String> const& value) override;
virtual JS::GCPtr<Layout::Node> create_layout_node(NonnullRefPtr<CSS::StyleProperties>) override;