- From: Simon Pieters <simonp@opera.com>
- Date: Mon, 17 Aug 2009 16:11:04 +0200
- To: "Ian Hickson" <ian@hixie.ch>
- Cc: "public-html@w3.org" <public-html@w3.org>
On Fri, 14 Aug 2009 03:54:08 +0200, Ian Hickson <ian@hixie.ch> wrote: > 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? It should return null, which will be ignored when set on fillStyle and strokeStyle. -- Simon Pieters Opera Software
Received on Monday, 17 August 2009 14:11:51 UTC