[vlc-devel] [PATCH 4/4] win32: Send fullscreen to specific monitor

Alexandre Janniaux ajanni at videolabs.io
Fri Oct 25 21:14:00 CEST 2019

Probably not bugs, with regards to the documentation for
this which is incomplete, but I agree with Rémi that it
should also work with caching when the module is
initialized, because it should report new or removed

When we're doing the enumeration from the UI, it doesn't
matter and we shouldn't do caching as there is not enough
lifetime for interesting storage anyway. As it is only for
configuration it almost doesn't matter in this design.

However in your scenario, the window will indeed not do the
correct behaviour with the current window implementation,
as the fullscreen state and information is not stored and
restored during Enable. That's a very good point.

The pivotal point here is that requests like SetFullscreen
can be applied with the window being disabled. It's not
very documented but the main motive behind is to be able to
configure the video playback surface before actually making
it visible to the user, while keeping the window provider
module running so as to reports outputs. It's a bit
confusing from a module provider implementor point of view
but is far easier to use from the API user point of view
and provides a better UX than in previous 3.0.

We probably want something like not changing screen if the
video is already started, or if it goes to the next one,
but the interface might want to set the correct screen when
the playback will be stopped.

Alexandre Janniaux

On Fri, Oct 25, 2019 at 08:49:03PM +0300, Rémi Denis-Courmont wrote:
> Le perjantaina 25. lokakuuta 2019, 20.37.06 EEST Gabriel Luci a écrit :
> > I would normally agree, but monitors can be unplugged and plugged in at any
> > time (especially wireless displays). Consider this scenario:
> >
> > 1. A chosen monitor is selected and VLC closed.
> > 2. The chosen monitor is disconnected.
> > 3. The next time VLC is run, and video played, the enumeration (without the
> > chosen monitor) is saved, and video plays on the primary monitor.
> > 4. You realize your forgot to plug in your chosen monitor, and do so.
> >
> > In that case, VLC will not play video on the chosen monitor until the
> > enumeration is forced to happen again (restarting VLC or opening
> > preferences, for example).
> Sure it will. Unless you write bugs.
> --
> Rémi Denis-Courmont
> http://www.remlab.net/
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