Bug 237403 – Can't transfer an ImageBitmap through a MessageChannel

• Component: Canvas
• Status: RESOLVED CONFIGURATION CHANGED

[Kaiido]

Transferring an ImageBitmap through the ports of a MessageChannel makes the `data` of the MessageEvent `null`.  
This doesn't happen when only cloning the ImageBitmap instead of transferring it. This also doesn't happen when transferring from a Worker's `postMessage` (this is being tested by WPT), nor when transferred from an WindowProxy, i.e this only concerns MessageChannel.

You can see a minimal repro at https://jsfiddle.net/1kzxvad9/

[Radar WebKit Bug Importer]

<rdar://problem/90072516>

[Ahmad Saleem]

*** Safari 26.2 Beta ***

"clone", [object ImageBitmap] {
  close: function close() {
    [native code]
},
  height: 20,
  width: 20
}

"transfer", [object ImageBitmap] {
  close: function close() {
    [native code]
},
  height: 20,
  width: 20
}

*** Chrome Canary 144 ***

"clone", [object ImageBitmap] {
  close: function close() { [native code] },
  height: 20,
  width: 20
}
"transfer", [object ImageBitmap] {
  close: function close() { [native code] },
  height: 20,
  width: 20
}

*** Firefox Nightly 148 ***

clone", [object ImageBitmap] {
  close: function close() {
    [native code]
},
  height: 20,
  width: 20
}
"transfer", [object ImageBitmap] {
  close: function close() {
    [native code]
},
  height: 20,
  width: 20
}

_________

All browsers now match, It might have been fixed while it was reported. @Karl - anything I missed, or we can mark as `Config Changed`?

[Kaiido]

It probably has been fixed, indeed.

[Ahmad Saleem]

(In reply to Kaiido from comment #3)
> It probably has been fixed, indeed.

Thanks for confirming.