Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 48f0a2d2fe553bb66088d7158e509f6c01b44321
https://github.com/WebKit/WebKit/commit/48f0a2d2fe553bb66088d7158e509f6c01b44321
Author: Nikolas Zimmermann <[email protected]>
Date: 2026-08-19 (Wed, 19 Aug 2026)
Changed paths:
M Source/WebCore/rendering/svg/RenderSVGRoot.cpp
M Source/WebCore/rendering/svg/RenderSVGViewportContainer.cpp
M Source/WebCore/svg/SVGLengthContext.cpp
M Source/WebCore/svg/SVGSVGElement.cpp
M Source/WebCore/svg/SVGSVGElement.h
Log Message:
-----------
[LBSE] Cache the SVG viewport size used for length resolution
https://bugs.webkit.org/show_bug.cgi?id=322055
Reviewed by Said Abou-Hallawa.
SVGLengthContext::computeViewportSize() resolves a descendant's viewport
size from the nearest <svg> by recomputing currentViewBoxRect() on every
call. During a transform animation this runs once per shape per frame,
even though the viewport is invariant across the flush and identical for
all shapes under the same <svg>.
Cache the derived size - mirroring the existing logic used already for
m_cachedViewportSizeExcludingZoom.
Covered by existing tests.
* Source/WebCore/rendering/svg/RenderSVGRoot.cpp:
(WebCore::RenderSVGRoot::layout):
* Source/WebCore/rendering/svg/RenderSVGViewportContainer.cpp:
(WebCore::RenderSVGViewportContainer::updateLayoutSizeIfNeeded):
* Source/WebCore/svg/SVGLengthContext.cpp:
(WebCore::SVGLengthContext::computeViewportSize const):
* Source/WebCore/svg/SVGSVGElement.cpp:
(WebCore::SVGSVGElement::viewportSizeForLengthResolution const):
* Source/WebCore/svg/SVGSVGElement.h:
Canonical link: https://commits.webkit.org/319468@main
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