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Re: [fltk.coredev] Towards a Wayland platform for the FLTK library ?
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Re: Towards a Wayland platform for the FLTK library ? Albrecht Schlosser Jun 16, 2021  
  
On 6/16/21 4:03 PM Manolo wrote:
It turns out I had to introduce slight differences in the FLTK Wayland code depending on whether it's run with Weston or with Gnome-Wayland. This creates the need for libfltk to detect whether Weston is running. I have found that environment variable 
XDG_SESSION_DESKTOP may be where to get that info. I see its value is
weston or Ubuntu-wayland or gnome.
A question to Weston users Albrecht and W.B. :
Is XDG_SESSION_DESKTOP defined in your setup? and does its value contain the string "weston" ?
I haven't tried this yet in my Ubuntu VM, but on my Linux Mint the answers are unfortunately "yes" and "no". Here's an excerpt of maybe related environment vars: 

DESKTOP_SESSION=cinnamon
XDG_SESSION_DESKTOP=cinnamon
XDG_SESSION_TYPE=x11
WAYLAND_DISPLAY=wayland-0
I executed 'env' in a "terminal" session provided by my weston instance on the Linux desktop, the output is filtered.
You can see that WAYLAND_DISPLAY is defined. This is the only related variable that is different than in a normal X session, but that doesn't help, unfortunately. 

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