Bug 239688

Summary: REGRESSION (iOS 15.4): ColorizePhoto.com doesn't work
Product: WebKit Reporter: nkronlage
Component: WebGLAssignee: 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