[whatwg] <canvas> feedback

David Levin levin at google.com
Fri Mar 12 12:00:53 PST 2010

On Thu, Mar 11, 2010 at 9:16 PM, Ian Hickson <ian at hixie.ch> wrote:
> On Mon, 22 Feb 2010, David Levin wrote:
> >
> > I've talked with some other folks on WebKit (Maciej and Oliver) about
> > having a canvas that is available to workers. They suggested some nice
> > modifications to make it an offscreen canvas, which may be used in the
> > Document or in a Worker.
> What are the use cases?

The simplest is resize/rotate for large images.
However there are more advanced uses in which the page heavily uses canvas.
Since there are many canvas operations, they take a noticeable amount of
time, and it would be better than they are done on a different thread than
the main one.

Another use related use case is when a page needs to render multiple
canvases and each one is involved. (One could think of some sort of
animation.) It would also be nice if they could do multiple operations in
parallel (using multiple workers for instance.)
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