[whatwg] A question about the drawimage() canvas function
Kang-Hao (Kenny) Lu
kanghaol at oupeng.com
Fri Mar 1 19:01:50 PST 2013
(13/03/02 5:59), Glenn Maynard wrote:
> I recommend leaving Firefox alone and changing WebKit (and the spec) to
> match Firefox, because we already have interop (at least in the cases I
> tested) between Firefox and IE, and we already have interop during loads in
> all three. Changing WebKit to throw after loading will get everyone doing
> the same thing--changing Firefox will still leave IE out.
> (I haven't tested with IE10, FWIW, only IE9.)
IE10 behaves the same in your test case.
(13/03/02 6:45), Rik Cabanier wrote:
> Sorry about being unclear. Yes, I meant in addition of.
> - add your suggested step 1
> - change HTMLImageElement from original step 2 to CanvasImageSource
Did you mean to say "change *HTMLCanvasElement* from original step 2 to
CanvasImageSource" here? The original step 2 has
# If the image argument is an HTMLCanvasElement object with either a
# horizontal dimension or a vertical dimension equal to zero, then
# the implementation throw an InvalidStateError exception and return
(13/03/02 9:41), Glenn Maynard wrote:
> 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).
Just curious. Does it have to be SVG for an image to be zero-sized?
Web Specialist, Oupeng Browser, Beijing
Try Oupeng: http://www.oupeng.com/
More information about the whatwg