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

Rik Cabanier cabanier at gmail.com
Fri Mar 1 20:35:17 PST 2013

On Fri, Mar 1, 2013 at 5:41 PM, Glenn Maynard <glenn at zewt.org> wrote:

> On Fri, Mar 1, 2013 at 4:45 PM, Rik Cabanier <cabanier at gmail.com> wrote:
>> Sorry about being unclear. Yes, I meant in addition of.
>> So:
>> - add your suggested step 1
>> - change HTMLImageElement from original step 2 to CanvasImageSource
> "image" is always a CanvasImageSource, so if this is what was intended it
> would just omit the type check entirely.


> But why does it throw this exception in the first place?  It's a weird
> special case.  Blitting a zero-size image should do nothing, just like
> drawImage(src, 0, 0, 0, 0).

I agree. It seems odd...
Maybe it's just because that was the way it was implemented in WK.

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