Bug 268608

Summary:	Draws to unused 2D contexts may consume excessive amount of memory on Cocoa
Product:	WebKit	Reporter:	Kimmo Kinnunen <kkinnunen>
Component:	Canvas	Assignee:	Kimmo Kinnunen <kkinnunen>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	dino, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Local Build
Hardware:	Unspecified
OS:	Unspecified

Description Kimmo Kinnunen 2024-02-02 00:34:23 PST

Unused canvas draws consume memory

Draw canvas A to 2d context B
Update canvas A
Draw canvas A to 2d context B
Update canvas A
Draw canvas A to 2d context B

Don't use canvas B

Cauese each draw to stay in context B queue, as the results are not used.
Causes each update to A to migrate the data to COW buffer

Comment 1 Kimmo Kinnunen 2024-02-02 00:35:03 PST

<rdar://117708049>

Comment 2 Kimmo Kinnunen 2024-02-02 01:16:24 PST

Pull request: https://github.com/WebKit/WebKit/pull/23733

Comment 3 EWS 2024-02-06 11:45:43 PST

Committed 274164@main (da9744107a30): <https://commits.webkit.org/274164@main>

Reviewed commits have been landed. Closing PR #23733 and removing active labels.