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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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3
Userland/Libraries/LibWeb/CMakeLists.txt
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@ -317,6 +317,8 @@ set(SOURCES
SVG/AttributeNames.cpp
SVG/AttributeParser.cpp
SVG/SVGAnimatedLength.cpp
SVG/SVGClipPathElement.cpp
SVG/SVGElement.cpp
SVG/SVGElement.cpp
SVG/SVGGElement.cpp
SVG/SVGGeometryElement.cpp
@ -581,6 +583,7 @@ libweb_js_wrapper(NavigationTiming/PerformanceTiming)
libweb_js_wrapper(RequestIdleCallback/IdleDeadline)
libweb_js_wrapper(ResizeObserver/ResizeObserver)
libweb_js_wrapper(SVG/SVGAnimatedLength)
libweb_js_wrapper(SVG/SVGClipPathElement)
libweb_js_wrapper(SVG/SVGElement)
libweb_js_wrapper(SVG/SVGGeometryElement)
libweb_js_wrapper(SVG/SVGGraphicsElement)