How to implement OSD overlay in Wayland/Weston

[Pekka Paalanen]

On Tue, 19 Nov 2019 12:19:35 +0000
Simon Ser <contact at emersion.fr> wrote:

> On Tuesday, November 19, 2019 1:08 PM, Pekka Paalanen <ppaalanen at gmail.com> wrote:
> 
> > On Tue, 19 Nov 2019 12:55:31 +0100
> > Guillermo Rodriguez guillerodriguez.dev at gmail.com wrote:
> >  
> > > Hi,
> > > El mar., 19 nov. 2019 a las 12:38, Sebastian Krzyszkowiak
> > > (dos at dosowisko.net) escribió:
> > >  
> > > > On 11/19/19, Pekka Paalanen ppaalanen at gmail.com wrote:
> > > >  
> > > > > yes. I'm not aware of any Wayland extension that would allow clients to
> > > > > dictate always-on-top behaviour on the desktop. It has an obvious
> > > > > attack vector (malicious or misbehaving app setting always-on-top
> > > > > without user's consent) and a simple corner case (how do you stack
> > > > > multiple always-on-top windows).
> > > > > OSD as a concept seems like a desktop component, not a normal app.
> > > > > Hence I would expect such a client to use a domain-specific or custom
> > > > > protocol extension to set always-on-top. If your use case is not a
> > > > > generic desktop but some special environment, then a domain-specific
> > > > > protocol extension would be a way to go. For generic desktop
> > > > > environments you'd integrate with the particular DE specifically, e.g.
> > > > > a gnome-shell plugin or something.
> > > > > That is, if the OSD really is an independent separate program and not a
> > > > > part of some fullscreen application.  
> > > >
> > > > Sounds like something layer-shell protocol solves portably already.  
> > >
> > > That sounds interesting. Is that supported by Weston?  
> >
> > No. Not yet at least.  
> 
> layer-shell's goal is to provide a way to create portable desktop
> components, so it indeed seems like it's a nice fit for this use-case.
> Note that for security reasons access to layer-shell could be
> restricted, so layer-shell shouldn't be used by regular clients.

Yeah, if it can be implemented without messing up the normal shell
functions or needing consideration in shell plugins, that might be even
upstreamable into Weston.


Thanks,
pq

> Regarding Weston support, there's [1] which seems to implement part of
> layer-shell. I don't know how up-to-date and complete it is.
> 
> [1]: https://github.com/myfreeweb/weston-extra-dip

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