Re: [AD] Fullscreen problems on Linux

["Trent Gamblin" <trent@xxxxxxxxxx>]

Yeah, on my system sometimes the visible area is pushed to the lower left of
the screen with black filling out the rest. It's not really very useful
outside of native resolution. I wish Compiz didn't make it "legacy". You can
still turn it back on in Compiz settings by ticking "legacy fullscreen
support", I don't know why they deprecated it. Doesn't make much sense to
me.

Trent

-----Original Message-----
From: Beoran [mailto:beoran@xxxxxxxxxx] 
Sent: July 8, 2014 9:01 AM
To: Allegro Development
Subject: Re: [AD] Fullscreen problems on Linux

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.

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