[winswitch] XPRA: shadowing only the external monitor

Antoine Martin antoine at nagafix.co.uk
Wed Oct 20 12:08:23 BST 2021

On 20/10/2021 17:25, Sergio Callegari via shifter-users wrote:
> Hi,
> I would like to know if using xpra it is possible to shadow only one 
> part of a display, namely the one corresponding to an external monitor.
> It is my understanding that the shadow operation mode shadows a full 
> display. Namely if you have an external monitor attached, that is 
> placed, e.g. right of your standard screen via xrandr, xpra will shadow 
> the full display area (namely the one extending from your standard 
> screen to the right to include also the area corresponding to your 
> external monitor).
> Is it possible to shadow only the area corresponding to the external 
> monitor?
> This would be extra-useful. Specifically, it would let you attach a 
> "virtual display adapter" to the external (HDMI/DP) port of a computer 
> (see https://www.amazon.com/s?k=virtual+display+adapter) to pretend that 
> there is an external monitor attached and make your desktop environment 
> and applications use it. Then it would let you virtualize this monitor 
> over xpra to some other place (e.g. inside a web-browser in a tablet). 
> In other words it would let you do the same thing that can be done with 
> deskreen (https://deskreen.com/), but most likely with the better 
> efficiency and flexibility of xpra in terms of encodings, etc.
That's a great idea! I've got one of those dongles right here.

> Any clue?
I see that you've already created a ticket for it:
Let's continue there.


> Thanks, best regards,
> Sergio

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