Is it possible to rotate a single window in X11? I tried to use Xephyr but I run into bug 100458.

I use XMonad as WM if that helps.

  • I don't think there's a way in general. There was an experimental plugin/extension for Compiz a while ago that allowed for that, but I don't know its name or current state – Fox Mar 29 '17 at 23:11

I've searched around a bit and I'm surprised not to find a ready solution for this. A possibility could be to use KWin and write a "Kwin effect" for it: https://blog.martin-graesslin.com/blog/2009/07/how-to-write-a-kwin-effect/ . Also, a gnome shell extension is imaginable, but does not exist yet.

A workaround solution: Weston is the reference implementation of Wayland. It allows rotating windows with super-key + middle mouse button. As this works for Wayland clients only, you can run Xwayland in weston, run your X application on Xwayland, and rotate the Xwayland display. If your application supports Wayland (based on GTK3, QT5 or SDL, for example), this works in weston without Xwayland.

For X applications on Xwayland

WAYLAND_DISPLAY=wayland-0 Xwayland :5
DISPLAY=:5 yourXapplication
DISPLAY=:5 x-window-manager  # additionally run a window manager for comfort

(On Gnome-Wayland you can run Xwayland directly without using weston, but I'm not aware of a Gnome-Wayland option to rotate a window).

For QT5 applications without Xwayland:

WAYLAND_DISPLAY=wayland-0  QT_QPA_PLATFORM=wayland  yourQT5application

For GTK3 and SDL applications without Xwayland:

WAYLAND_DISPLAY=wayland-0 yourGTK3application

(Note: You can specify a wayland socket/WAYLAND_DISPLAY with weston --socket=mywaylandsocket instead of assuming it will be wayland-0. You need to do this on Gnome-Wayland as it uses wayland-0 itself)

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I'm adding a second answer using Weston, a bit different and more useable than my first one. Create a file ~/.config/weston.ini with this content:

# panel-location=none    
# wanna get mad? use: transform=flipped-270

This weston.ini enables a rootless xwayland.so in weston. The [output] section with name=X1 defines weston's appearance as X client.

  • mode=600x800 sets the screen/window size.
  • transform=90 rotates the weston display.
  • scale=1 sets a scaling factor if needed.
  • the [launcher] sections can be used to create custom panel starters for your X applications.

See man weston.ini and /usr/share/doc/weston/examples/weston.ini for further informations and options.

(Instead of using the weston panel, you can disable it with panel-location=none, parse output of weston for xserver listening on display :1 and use DISPLAY=:1 yourXapp)

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