Bug 218719 - APNG can be rendered with wildly incorrect (inverted) colors
Summary: APNG can be rendered with wildly incorrect (inverted) colors
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: Images (show other bugs)
Version: Safari 14
Hardware: All macOS 10.15
: P2 Normal
Assignee: Nobody
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2020-11-09 11:47 PST by Jonathan Deutsch
Modified: 2020-11-11 11:23 PST (History)
5 users (show)

See Also:

Attachments
problem image and source pngs (5.83 MB, application/zip)
2020-11-09 11:47 PST, Jonathan Deutsch 		no flags Details
Safari (incorrect) vs Chrome (correct) (1.06 MB, image/png)
2020-11-09 11:49 PST, Jonathan Deutsch 		no flags Details
View All Add an attachment (proposed patch, testcase, etc.)

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Description Jonathan Deutsch 2020-11-09 11:47:05 PST 
Created attachment 413612 [details]
problem image and source pngs

The attached "animated.png" does not render properly in Safari 14 or STP 115.  The coloring on some frames can be extremely incorrect.

- This does not happen when using Quick Look in the Finder
- This does not happen in Chrome

The PNG was generated with apngasm via:

```
apngasm -o animated.png -d 33 -l 1 --force sources/*.png
```

This affects content created by Tumult Hype: https://tumult.com/hype/
Comment 1 Jonathan Deutsch 2020-11-09 11:49:34 PST 
Created attachment 413613 [details]
Safari (incorrect) vs Chrome (correct)

Attached image of how it looks in Safari vs. Chrome.

Sometimes a refresh is required in Safari to render like this.
Comment 2 Smoley 2020-11-09 12:18:21 PST 
Thanks for filing. Apple internal see:
rdar://60165443
Comment 3 Said Abou-Hallawa 2020-11-09 15:41:01 PST 
Yes the red and the blue channels are exchanged in the frames of the APNG in WebKit.
Comment 4 Tim Horton 2020-11-11 11:11:34 PST 
Only reproduces with accelerated drawing on, so this is underneath us. Thank you for the report! Feel free to file a bug at feedbackassistant.apple.com if you want to track the status, but I'll also route the one mentioned above to the right place.
Comment 5 Jonathan Deutsch 2020-11-11 11:23:14 PST 
Thanks for promptly looking into this.