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LibWeb: Sketch out a very basic SVG <clipPath> element

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This element doesn't actually support anything at the moment, but it
still massively speeds up painting performance on Wikipedia! :^)

How? Because we no longer paint SVG <path> elements found inside
<clipPath> elements. SVGClipPathElement::create_layout_node() returns
nullptr which stops the layout tree builder from recursing further into
the subtree, and so the <path> element never gets a layout or paint box.

Mousing over Wikipedia now barely break 50% CPU usage on my machine :^)
This commit is contained in:
Andreas Kling 2022-04-10 19:05:12 +02:00
parent c6e79124c7
commit e81594d9a1
8 changed files with 68 additions and 0 deletions
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23
Userland/Libraries/LibWeb/SVG/SVGClipPathElement.h Normal file
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/*
* Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <LibWeb/SVG/SVGElement.h>
namespace Web::SVG {
class SVGClipPathElement final : public SVGElement {
public:
using WrapperType = Bindings::SVGClipPathElementWrapper;
SVGClipPathElement(DOM::Document&, DOM::QualifiedName);
virtual ~SVGClipPathElement();
virtual RefPtr<Layout::Node> create_layout_node(NonnullRefPtr<CSS::StyleProperties>) override;
};
}