[whatwg] Proposal: createImageBitmap should return a "Promise" instead of using a callback

Justin Novosad junov at google.com
Wed Jun 19 06:19:35 PDT 2013

I was about to launch the implementation of window.createImageBitmap in
Blink, and I received feedback on the blink-dev mailing list that the
"Promise" API is the wave of the future for asynchronous JS, and that the
new createImageBitmap method should use Promises.

Current spec:

The proposal is to change the ImageBitmapFactories IDL to something like

interface ImageBitmapFactories {
  Promise createImageBitmap(ImageBitmapSource image, optional long sx, long
sy, long sw, long sh);

The value of the promise would resolve to an ImageBitmap object.

What do we think?

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