Re: [AD] Fullscreen problems on Linux

[Beoran <beoran@xxxxxxxxxx>]

I took a different approach and read the xfwm4 source code to see what it
when you use _net_wm to set fullscreen, and surprisingly, it doesn't 
change
real the resolution at all! No calls to xrandr or xvideomode at all. 
In stead
it just makes the window undecorated and tries to place and extend it 
if possible
to the size of the monitor the center of the window is on.

I suspect that SDL cheats here and sets up some kind of transformation 
to hide
the fact that there's no real resolution switch, but I'm not sure.

I guess that's one way of understanding what net wm's fullscreen is 
about,
but it's not very useful. It means that you were right, Trent, this is 
more of a
way to get a fullscreen window after all. I saw on some mailing lists 
there was
some talk in 2012 of implementing a real resolution-changing 
full-screen but that
didn't seem to have led anywhere yet.

One good thing I did find out though from reading xfwm4 sources is
that _NET_WM_FULLSCREEN_MONITORS will contain the size of the monitor
that can be used for setting a fullscreen window, so no need for 
XRandr to find
out the monitor sizes.

In conclusion I'd say that compiz/ubuntu has jumped the gun again and 
declared
XRANDR mode setting "legacy" even though there is no real good 
alternative
apart from full screen windows. Blah. Maybe I sghould read compiz's 
sources too
to see what that does and copare it with xfwm4. But I wonder: how to 
solve this, then?

Kind Regards ,

Bjorn.