[Wayland-bugs] [Bug 90007] Cannot rotate input touchscreen with Xorg + libinput

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90007

--- Comment #2 from Éric Brunet <eric.brunet at lps.ens.fr> ---
Created attachment 115125
  --> https://bugs.freedesktop.org/attachment.cgi?id=115125&action=edit
Updating of the man page of xf86-input-libinput.

Ho...

Thanks for the link! I have been doing too much math lately. I saw a 3x3
matrix called InputCoordinateTransformation, and I thought (without
checking, my bad) that it was transforming 3D coordinates 
   (x,y,z)  =>  (x',y',z') = M (x,y,z)
in anticipation of future fancy input methods...

The transformation is instead
   (x,y)  => (x',y') = M (x,y) + (x0,y0)
I think I would have guessed if the matrix had been 3x2  instead of 3x3,
and I am still confused about the meaning of the third row, but at least
I can now rotate my screen as I want.

May I suggest updating the man page of the xf86 libinput driver to explain
this?
The interface is neither intuitive nor user-friendly, and documentation is
always good. I am attaching a patch to this effect.

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