It is not clear from this discussion what support there will be for
"mouse mode" for the tablets.
A problem I have had with the current tablet api is that it is designed
for mapping the tablet to the bounding box surrounding all the outputs.
"mouse mode" simply means that the movement is relative and does not
change this scaling.
What is wanted in mouse mode is a fixed translation of a 1" square on
the tablet to a square in output space. Other operating systems do this
when you switch to mouse mode. I have to run a rather annoying Python
program every time the screen layout is changed to calculate the very
non-intuitive rectangle I have to send to the mouse driver.
Also I only want mouse mode when I have two outputs. If I have one the
tablet can be used in direct mode. This may also be true if a program
could grab the tablet and direct it to it's window that turning off
mouse mode would be useful. I also have a smaller tablet that I would
like to be in mouse mode all the time.
I think a much more intelligent version can be done, which automatically
goes into mouse mode. Basically the user chooses how big a 1-inch square
on the tablet turns into in output space, and a limit to how distorted
this output square can be (perhaps from 1.5:1 to 1:1.5). On every change
of the tablet or outputs wayland/libinput then figures out a mapping
that is not too far from this scale and within the distortion dimensions
for non-mouse-mode, if that is impossible it goes to mouse mode.
I don't know if this would be libinput or the compositor but the ability
to do this would be a nice addition to Wayland.
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