[Webkit-unassigned] [Bug 272350] New: JPEG XL: Progressive decoding

Mon Apr 8 13:44:24 PDT 2024

https://bugs.webkit.org/show_bug.cgi?id=272350

            Bug ID: 272350
           Summary: JPEG XL: Progressive decoding
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: imbashenk at hotmail.com
                CC: sabouhallawa at apple.com

When loading a JPEG XL Image the image does not progressive decode. This is also not the case in Firefox nightly. So I am not sure if the Safari is the actual problem, but it feels like it.

Here is a reproduction.

This is the HTML:
```
<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>Test progressive decoding JPEG XL</title>
  </head>
  <body>
    <img src="output.jxl" />
  </body>
</html>
```

This is how the JPEG XL is created:
`cjxl input.jpeg output.jxl --progressive_dc=1`

`cjxl` referece to this library https://github.com/libjxl/libjxl?tab=readme-ov-file. `--progressive_dc=1` should be the flag that enables progressive decoding on the JPEG XL.

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