- From: Ian Hickson <ian@hixie.ch>
- Date: Fri, 14 Aug 2009 01:54:08 +0000 (UTC)
- To: Simon Pieters <simonp@opera.com>
- Cc: "public-html@w3.org" <public-html@w3.org>
On Thu, 6 Aug 2009, Simon Pieters wrote: > > The spec says that canvas drawImage() should throw INVALID_STATE_ERR > when the image isn't loaded yet or video isn't enough loaded. I think > this is a bad idea. > > I expect authors to just draw a video on a canvas when they see fit, > test locally or on a stable network, see that it works fine. Then the > script will stop working completely for some users because of the > uncaught exception when the script tries to drawImage() a video that's > not ready yet. > > Moreover, Opera has lazy loading of images (only loading images that are > rendered or have some event handlers or were created with new Image() > etc), so we'd probably want to just load the image when the script tries > to draw it instead of throwing. > > Therefore I suggest that the spec be changed to not throw > INVALID_STATE_ERR for drawImage() (and createPattern()). > > The method could be changed from void to return a boolean, indicating > whether the image was successfully drawn, so scripts can detect it > easily. What should createPattern() return in this situation? -- Ian Hickson U+1047E )\._.,--....,'``. fL http://ln.hixie.ch/ U+263A /, _.. \ _\ ;`._ ,. Things that are impossible just take longer. `._.-(,_..'--(,_..'`-.;.'
Received on Friday, 14 August 2009 01:54:43 UTC