Bug 239688

Summary:	REGRESSION (iOS 15.4): ColorizePhoto.com doesn't work
Product:	WebKit	Reporter:	nkronlage
Component:	WebGL	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Major	CC:	dino, kbr, kkinnunen, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	Safari 15
Hardware:	iPhone / iPad
OS:	iOS 15
See Also:	https://bugs.webkit.org/show_bug.cgi?id=240790
Bug Depends on:
Bug Blocks:	231180

Description nkronlage 2022-04-23 00:03:00 PDT

A recent regression in iOS 15.4 causes https://www.colorizephoto.com/ to stop working, affecting many site users. Disabling WebGL via Metal restores functionality to the site.

Repro:
Ensure 'WebGL via Metal' enabled: Settings App -> Safari -> Advanced -> Experimental Features -> Turn on 'WebGL via Metal'
In Safari, go to https://www.colorizephoto.com/converter
Try painting on Clint Eastwood's face

Expected:
The black/white photo should have skin color where you paint

Actual:
Nothing happens - no coloring of the black/white photo

Try again after turning off 'WebGL via Metal' to see the correct behavior

Comment 1 Radar WebKit Bug Importer 2022-04-24 13:02:57 PDT

<rdar://problem/92238140>

Comment 2 Kimmo Kinnunen 2022-05-23 03:44:09 PDT

Still repros on iOS. Unclear if bug 240790 is the root cause