[whatwg] Canvas in workers

Justin Novosad junov at google.com
Wed Oct 16 13:13:05 PDT 2013

On Wed, Oct 16, 2013 at 3:53 PM, Robert O'Callahan <robert at ocallahan.org>wrote:

> On Thu, Oct 17, 2013 at 6:35 AM, Kenneth Russell <kbr at google.com> wrote:
>> Yes, right. That factory method is already spec'ed on the
>> WorkerGlobalScope [1]. It actually returns a Promise, so presumably
>> transferToImageBitmap would have to as well.
> The whole point of transferToImageBitmap is that it's really fast, so I
> don't see why it has to be async.

True. I also wonder why all of the currently spec'ed ImageBitmap creation
methods are async. I think asynchrony makes sense when creating
ImageBitmaps from blobs, image elements and video elements, which may not
be in an immediately accessible state, but creating an ImageBitmap from a
Canvas or canvas context (or a WorkerCanvas) could be immediate.

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