Bug 241935

Summary:	Don't allocate backing stores for non-animated compositing layers with zero opacity
Product:	WebKit	Reporter:	Matt Woodrow <mattwoodrow>
Component:	Layout and Rendering	Assignee:	Matt Woodrow <mattwoodrow>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	bfulgham, simon.fraser, webkit-bug-importer, zalan
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Matt Woodrow 2022-06-23 14:25:15 PDT

We currently allocate (and paint) a backing store for opacity:0 layers, so that we can initiate animations faster.

Unfortunately this uses a lot of memory, so we're going to try skipping this, and allocating/painting on demand when an animation is started.

Comment 1 Matt Woodrow 2022-06-23 14:29:26 PDT

<rdar://93608011>

Comment 2 Matt Woodrow 2022-06-23 14:30:53 PDT

Pull request: https://github.com/WebKit/WebKit/pull/1743

Comment 3 EWS 2022-06-29 15:00:29 PDT

Committed 251965@main (6d4c5f059b87): <https://commits.webkit.org/251965@main>

Reviewed commits have been landed. Closing PR #1743 and removing active labels.