Bug 256621

Summary:	Mask back to front buffer copy when using remote rendering path
Product:	WebKit	Reporter:	Ben Nham <nham>
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 Ben Nham 2023-05-10 16:52:37 PDT

When comparing QuartzCore's implementation of back to front buffer copies to our implementation of the copy in RemoteLayerBackingStore, there are two optimizations that we are missing. First, QuartzCore masks the back to front buffer copy by the dirty shape. Secondly, it avoids re-clearing a surface that was just allocated. Implement these optimizations in RemoteLayerBackingStore to see if they improve our memory bandwidth regression.

Comment 1 Radar WebKit Bug Importer 2023-05-10 16:52:56 PDT

<rdar://problem/109179068>

Comment 2 Ben Nham 2023-05-10 16:57:06 PDT

Pull request: https://github.com/WebKit/WebKit/pull/13729

Comment 3 Matt Woodrow 2023-05-11 13:59:28 PDT

Pull request: https://github.com/WebKit/WebKit/pull/13770

Comment 4 EWS 2023-05-11 18:11:55 PDT

Committed 263994@main (c26d9ad7d08d): <https://commits.webkit.org/263994@main>

Reviewed commits have been landed. Closing PR #13770 and removing active labels.