The calibration utility was modified in cf408c27b0 to return unitless
padding measurements instead of axis values for storage in gsettings.
Unfortunately, the code still assumes in some places that it is working
with axes rather than paddings. This causes subtle math errors that
result in undesired cursor offsets after the calibration is applied.
Fortunately, this can be simplified, since tablet area is always reset
to the default state before starting calibration, we are sure that the
value will remain constant. Since both axes are in the same 0..1 scale,
calibration code doesn't need to swap X/Y back and forth to calculate
each axis scale.
Additionally, the code to get the calibrated axis values has been moved
into its own function along with a new function that returns padding
values suitable for consumption by g-c-c. All calculations are performed
internally in the 0..1 range.
https://bugzilla.gnome.org/show_bug.cgi?id=784009
Co-Authored-By: Carlos Garnacho <carlosg@gnome.org>
The "area" setting has a different treatment in the gsettings-desktop-schemas
tablet schema, the 4 double values express the padding (in unitless 0..1
range) on each of the sides of the tablet. It's been done so we don't rely
on input/output units, which we might have not the luxury to access.
Besides that, the dependency on GsdWacomDevice has been cleared.
The previous axis swapping code would oddly rely on the input coordinates
remaining on untransformed device coordinates, while those are gotten on
screen coordinates (hence rotated), this would cause swapping not to kick
in, and result in swapped X/Y scaling to be applied to X/Y ranges.
So make the axis swapping code be calculated upon screen coordinates, as
the collected points already are, and swap the applied scalings if
necessary.
Also, the code that swapped coordinates before returning to the caller
would scramble min/max values when swapping x/y. Fix that too, minimum
and maximum should stay like that when swapping axes.
https://bugzilla.gnome.org/show_bug.cgi?id=732442
Calibration must be performed based on the device w/h ranges and the
screen size, so in which coordinates the monitor is virtually mapped
matters little on device coordinates. This fixes calibration of devices
attached to a monitor elsewhere than (0,0) in the screen.
https://bugzilla.gnome.org/show_bug.cgi?id=719574
Copies over files from a trimmed version of xinput-calibrator and
modifies the Makefile.am to build the program as a seperate utility.
This is just to verify the functionality of the code when built with
gnome-control-center.
https://bugzilla.gnome.org/show_bug.cgi?id=657423
