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Re: Screen sharing

From: cowwoc <cowwoc@bbs.darktech.org>
Date: Thu, 24 Apr 2014 15:15:04 -0400
Message-ID: <535962B8.2040906@bbs.darktech.org>
To: public-media-capture@w3.org
Hi Martin,

> Note
> Open Issue: Some systems obscure with the image of what was visible 
> before it was obscured. Imagine a use caser where Alice is sharing a 
> powerpoint presentation with with Bob. Alice gets an instant messages 
> which pops up a dialog box on top of th powerpoint application. In 
> some systems, the video sent to Bob will show a grey rectangle and Bob 
> will know an IM poped up even thought Bob can not see the contents of 
> the IM. In other systems, the obscuring will be done using the 
> previously visible bitmap so, as long as the powerpoint slide does not 
> change before Alice gets rid of the IM dialog box, Bob will not see a 
> big ugly grey rectangle in the middle of the slide he is trying to 
> read. The down side is if the window being shared was a video, the 
> obscured rectangle will look frozen and some users will perceive this 
> as a bug in the system while the grey rectangle users will generally 
> understand was an obscured region. There can also be cases where as 
> windows in the application are moved around, "old" data does not get 
> cleared up as the system is using to generate obscured data.

Something doesn't make sense here. If Alice is really sharing a specific 
application, no other processes cannot overlap its painting area. On the 
other hand, if Alice is sharing her entire desktop, I'd expect Bob to 
see the contents of the IM.

Received on Thursday, 24 April 2014 19:15:54 UTC

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