Bug 255181

Summary:	[ iOS ] fast/gradients/linear-two-hints-angle.html is a constant ImageOnlyFailure
Product:	WebKit	Reporter:	Robert Jenner <jenner>
Component:	Layout and Rendering	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	bfulgham, simon.fraser, webkit-bot-watchers-bugzilla, webkit-bug-importer, zalan
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Robert Jenner 2023-04-07 16:58:37 PDT

fast/gradients/linear-two-hints-angle.html

is a constant ImageOnlyFailure on iOS.

HISTORY:
https://results.webkit.org/?suite=layout-tests&test=fast%2Fgradients%2Flinear-two-hints-angle.html

This appears to have started after we updated to iOS 16.4.

DIFF URL:
https://build.webkit.org/results/Apple-iOS-16-Simulator-Release-WK2-Tests/262718@main%20(2043)/fast/gradients/linear-two-hints-angle-diffs.html

It appears to be off by .01%

Comment 1 Radar WebKit Bug Importer 2023-04-07 16:58:56 PDT

<rdar://problem/107774707>

Comment 2 Robert Jenner 2023-04-07 16:59:54 PDT

I have reproduced this at iOS 16 Release ToT running as follows:

run-webkit-tests --iOS-simulator fast/gradients/linear-two-hints-angle.html

I have marked expectations for this test while under investigation. 

https://commits.webkit.org/262734@main

Comment 3 Simon Fraser (smfr) 2023-04-07 17:12:29 PDT

Needs some pixel tolerance (or we turn off gradient noise).

Comment 4 Alexey Proskuryakov 2023-04-08 17:14:39 PDT

How can we turn off gradient noise? That sounds like a better fix.

Comment 5 Ryan Haddad 2023-04-10 15:58:01 PDT

(In reply to Alexey Proskuryakov from comment #4)
> How can we turn off gradient noise? That sounds like a better fix.

+1 for this, I've see many of these kinds of diffs for tests using linear gradients.

Comment 6 Simon Fraser (smfr) 2023-04-10 16:05:00 PDT

See <rdar://problem/83258510>

Comment 7 EWS 2023-04-11 22:15:28 PDT

Test gardening commit 262858@main (01307ba22bed): <https://commits.webkit.org/262858@main>

Reviewed commits have been landed. Closing PR #12638 and removing active labels.