Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 2bd61e2f1c05935f2600b9c0edac21f60783ce39
https://github.com/WebKit/WebKit/commit/2bd61e2f1c05935f2600b9c0edac21f60783ce39
Author: Taher Ali <[email protected]>
Date: 2025-04-16 (Wed, 16 Apr 2025)
Changed paths:
M LayoutTests/platform/gtk/TestExpectations
M LayoutTests/platform/ios/svg/W3C-SVG-1.1/text-intro-05-t-expected.txt
M LayoutTests/platform/mac/svg/W3C-SVG-1.1/text-intro-05-t-expected.txt
M LayoutTests/platform/wpe/TestExpectations
A LayoutTests/svg/text/timeout-long-text-content-expected.txt
A LayoutTests/svg/text/timeout-long-text-content.html
M Source/WebCore/rendering/svg/SVGTextMetricsBuilder.cpp
M Source/WebCore/rendering/svg/SVGTextMetricsBuilder.h
Log Message:
-----------
Fix high CPU usage for long SVG text workloads
https://bugs.webkit.org/show_bug.cgi?id=291574
rdar://147359331
Reviewed by Vitor Roriz.
SVGTextMetricsBuilder advances character by character,
instantiating SVGTextMetrics and calling FontCascade::width, which
creates a ComplexController. This occurs in a busy loop, creating and
discarding many ComplexControllers, which is expensive.
This optimization reuses a single ComplexController within the busy loop
to handle all complex text advances.
* Source/WebCore/rendering/svg/SVGTextMetricsBuilder.cpp:
(WebCore::SVGTextMetricsBuilder::advanceComplexText):
(WebCore::SVGTextMetricsBuilder::measureTextRenderer):
* Source/WebCore/rendering/svg/SVGTextMetricsBuilder.h:
Canonical link: https://commits.webkit.org/293774@main
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