Added Fallback for Offscreen Canvas

[terrible-terry]

OffScreencanvas isn't supported by all browsers, this uses OffScreencanvas when available and provides a fallback when its not available.

[vasturiano]

@terrible-terry thanks for reaching out.

By looking at the MDN docs, OffscreenCanvas appears to have a pretty good support coverage among all modern browsers. May I ask which browser did you come across that didn't support it?

[terrible-terry]

IOS Mobile 15.7.1 on Safari

[vasturiano]

Thanks @terrible-terry.

It seems it is supported in iOS Safari since v16.4, which was released in March 2023. My recommendation would be to update the browser to a more recent version.

[terrible-terry]

I have a small percentage of users who operate older IOS devices that cannot be upgraded to a compatible version. Fairly old devices in my opinion but this is just the solution I went with rather than tell them they need to use another browser or buy a new device.

[vasturiano]

@terrible-terry you can perhaps try to apply a polyfill for OffScreenCanvas directly in your app. That will probably fix the issue for those users.

The problem with supporting adhoc older browser conditions is that it can be just the tip of the iceberg, and there might be many more other unsupported features that also need attention. So you need to draw the line somewhere. Hope you understand.