470371 - drawImage with <video> doesn't work unless video is visible

Status: RESOLVED WORKSFORME

(Core :: Graphics: Canvas2D, defect, P2)

Description

[Vladimir Vukicevic [:vlad] [:vladv] (needinfo me, slow to respond)]

If you use drawImage with a video element that's not attached to the document (or I suspect is attached but display:none), nothing gets drawn.  I'm guessing that this is because the video frames aren't being created in this case.

Comment 1

[Robert O'Callahan (:roc) (email my personal email if necessary)]

I swear this used to work!

Comment 2

[Robert O'Callahan (:roc) (email my personal email if necessary)]

Attachment: testcase which works

This testcase works for me on Mac, so in general this feature does work.

Comment 3

[Robert O'Callahan (:roc) (email my personal email if necessary)]

http://nerget.com/canvas/?paddy.ogg#blargh gives me a 404.

Comment 4

[Robert O'Callahan (:roc) (email my personal email if necessary)]

layout/reftests/ogg-video/canvas-1a.xhtml actually tests this. 1.9.1 has that test too. It's enabled in reftest.list in all branches.

http://people.mozilla.com/~mnandigama/codecoverage_html/layout/base/nsLayoutUtils.cpp.gcov.html shows that the video code in nsLayoutUtils::GetSurfaceFromElement is covered.

I guess this got fixed since Vlad filed the report.