19820 2012-11-01 15:45:39 +0000 Description of transformation in drawimage is confusing 2013-02-01 07:35:43 +0000 1 1 1 Unclassified HTML WG HTML Canvas 2D Context unspecified PC All RESOLVED FIXED P2 normal --- 19818 1 cabanier jaymunro eoconnor ian mike public-html-admin public-html-wg-issue-tracking silviapfeiffer1 public-html-bugzilla oldest_to_newest 77681 0 cabanier 2012-11-01 15:45:39 +0000 See: http://www.w3.org/TR/2dcontext/#drawing-images-to-the-canvas The text for drawImage currently states: When drawImage() is invoked, the region of the image specified by the source rectangle must be painted on the region of the canvas specified by the destination rectangle, after applying the current transformation matrix to the points of the destination rectangle. This is a bit confusing since you don't really apply the transform to the points. Basically, you map the source rect to the destination rect and then transform the destination rectangle. I believe the spec should also call out that there should be no loss of precision when doing this (i.e. if the destination has half the pixels but scaled by 2, the original pixel should be preserve) 78153 1 jaymunro 2012-11-09 22:20:56 +0000 EDITOR'S RESPONSE: This is an Editor's Response to your comment. If you are satisfied with this response, please change the state of this bug to CLOSED. If you have additional information and would like the Editor to reconsider, please reopen this bug. If you would like to escalate the issue to the full HTML Working Group, please add the TrackerRequest keyword to this bug, and suggest title and text for the Tracker Issue; or you may create a Tracker Issue yourself, if you are able to do so. For more details, see this document: http://dev.w3.org/html5/decision-policy/decision-policy.html Status: Fixed Change Description: https://github.com/w3c/html/commit/01e58cb8b32f92401d891bf2a1614fd7493cbeca Rationale: Applying the matrix is not on the points of a rectangle. Also clarified that the original image is not updated. 78154 2 eoconnor 2012-11-09 23:15:26 +0000 Have you suggested this change to Ian? 78269 3 jaymunro 2012-11-13 16:13:40 +0000 No, I thought he was watching our bugs as well. I'd be glad to suggest it. (In reply to comment #2) > Have you suggested this change to Ian? 82463 4 silviapfeiffer1 2013-02-01 07:35:43 +0000 Note, he made this change: https://github.com/w3c/html/commit/babafd346a6a54643991f14e8becd307e0d0f272