[whatwg] A question about the drawimage() canvas function

Robert O'Callahan robert at ocallahan.org
Fri Mar 1 13:28:20 PST 2013


I actually just wrote a patch to implement the spec behavior in Firefox.

I think changing behavior from "throw" to "not throw" shouldn't have any
compatibility concerns. I also think that "not throw" is better here than
throwing; it's simpler to not distinguish "finished downloading but
decoding failed" from "download in progress (but very slow perhaps)".

In fact I question why the spec has us throw for zero-sized canvas source.
It would seem to me to be simpler/better to just not draw and not throw in
that case also.

Rob
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