- From: <bugzilla@jessica.w3.org>
- Date: Thu, 01 Nov 2012 15:45:39 +0000
- To: public-html@w3.org
https://www.w3.org/Bugs/Public/show_bug.cgi?id=19820 Priority: P2 Bug ID: 19820 CC: mike@w3.org, public-html-wg-issue-tracking@w3.org, public-html@w3.org Assignee: jaymunro@microsoft.com Summary: Description of transformation in drawimage is confusing QA Contact: public-html-bugzilla@w3.org Severity: normal Classification: Unclassified OS: All Reporter: cabanier@adobe.com Hardware: PC Status: NEW Version: unspecified Component: HTML Canvas 2D Context Product: HTML WG 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) -- You are receiving this mail because: You are on the CC list for the bug.
Received on Thursday, 1 November 2012 15:45:40 UTC