- From: Ian Hickson <ian@hixie.ch>
- Date: Mon, 8 Aug 2011 20:58:03 +0000 (UTC)
On Mon, 8 Aug 2011, Justin Novosad wrote: > > This inquiry is regarding this page of the specification: > http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html > In section 4.8.11.1.10 Images, about drawImage(), it is stated that "If > one of the sw or sh arguments is zero, the implementation must raise an > INDEX_SIZE_ERR exception" There are no other references to other > circumstances under which INDEX_SIZE_ERR should be thrown, and there is > no indication of what the correct behavior is when the source rectangle > is completely or partially outside the bounds of the source image. A bit lower down in the same section, the spec says: "When the filtering algorithm requires a pixel value from outside the original image data, it must instead use the value from the nearest edge pixel. (That is, the filter uses 'clamp-to-edge' behavior.)" -- Ian Hickson U+1047E )\._.,--....,'``. fL http://ln.hixie.ch/ U+263A /, _.. \ _\ ;`._ ,. Things that are impossible just take longer. `._.-(,_..'--(,_..'`-.;.'
Received on Monday, 8 August 2011 13:58:03 UTC