Bug 261630

Summary: Avoid computing layer bounds in BackingSharingState::isAdditionalProviderCandidate()
Product: WebKit Reporter: Simon Fraser (smfr) <simon.fraser>
Component: CompositingAssignee: Simon Fraser (smfr) <simon.fraser>
Status: RESOLVED FIXED    
Severity: Normal CC: koivisto, simon.fraser, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: WebKit Local Build   
Hardware: Unspecified   
OS: Unspecified   

Description Simon Fraser (smfr) 2023-09-15 19:50:33 PDT 
The calls to calculateLayerBounds() in BackingSharingState::isAdditionalProviderCandidate() show as very hot on profiles on a page with many (thousands) of backing sharing candidates.

We have already computed layer bounds, so we can just use the ones we've computed in OverlapExtent.
Comment 1 Radar WebKit Bug Importer 2023-09-15 19:51:04 PDT 
<rdar://problem/115584910>
Comment 2 Simon Fraser (smfr) 2023-09-15 20:00:44 PDT 
Pull request: https://github.com/WebKit/WebKit/pull/17834
Comment 3 EWS 2023-09-16 12:47:57 PDT 
Committed 268056@main (9dcbb2227753): <https://commits.webkit.org/268056@main>

Reviewed commits have been landed. Closing PR #17834 and removing active labels.