tablet: Report and normalize distance, pressure, and tilt axes

Report the values for the distance, pressure, and tilt axes. Pressure is
normalized to a range of 0 to 1, and tilt is normalized to a range of -1 to 1.

Based off the patch originally written by Carlos Garnacho

Signed-off-by: Stephen Chandler Paul <thatslyude@gmail.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Sanitize distance and pressure axes before reporting their values

This commit changes two things with the way distance and pressure axes are
reported:
1. Distance and pressure are made mutually exclusive. When there is a distance
   event and a pressure event and the tool is in contact with the tablet, only
   the pressure change will be reported. When the tool is not in contact and
   both a distance and pressure change are received, only the distance update
   will be received.
2. Bad distance events are not reported to the caller. There is a certain
   distance a tool can be from the tablet where the tablet recongnizes that a
   tool appeared, but the tool doesn't send any useful information to the
   tablet. When this happens, the distance will update to it's minimum or
   maximum value, and no other axis updates will be sent. Since this can give
   a caller the impression that the tool is within a useful proximity of the
   tablet, we filter out any distance events with a value of maximum or minimum
   when the tool is not within useful proximity of the tablet.

Signed-off-by: Stephen Chandler Paul <thatslyude@gmail.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
tools: Handle pressure, tilt, and distance in event-debug

Signed-off-by: Stephen Chandler Paul <thatslyude@gmail.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
test: Add infrastructure for testing tablet events.

no vfuncs are used, only input_event arrays.

Signed-off-by: Carlos Garnacho <carlosg@gnome.org>
Signed-off-by: Stephen Chandler Paul <thatslyude@gmail.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
test: Add litest_assert_double_*() macros

Converts two doubles to 24.8 fixed-width integers so assertions can be made with
doubles in tests

Signed-off-by: Stephen Chandler Paul <thatslyude@gmail.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
test: Add Wacom Bamboo 16FG 4x5 Pen device definition

Signed-off-by: Carlos Garnacho <carlosg@gnome.org>
Signed-off-by: Stephen Chandler Paul <thatslyude@gmail.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
test: Add Wacom Cintiq 12WX device definition

Signed-off-by: Carlos Garnacho <carlosg@gnome.org>
Signed-off-by: Stephen Chandler Paul <thatslyude@gmail.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
test: Add Wacom Intuos5 touch M Pen device definition

Signed-off-by: Carlos Garnacho <carlosg@gnome.org>
Signed-off-by: Stephen Chandler Paul <thatslyude@gmail.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
test: Add Wacom ISDv4 E6 Pen device definition

Signed-off-by: Carlos Garnacho <carlosg@gnome.org>
Signed-off-by: Stephen Chandler Paul <thatslyude@gmail.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
test: Add proximity tests

This tests to make sure proximity events actually work, that they don't output
cooirdinate events after they occur, and that they make sure to release all of
the buttons and clear the values of all the axes

Based off the patch originally written by Carlos Garnacho

Signed-off-by: Stephen Chandler Paul <thatslyude@gmail.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
test: Add motion event test for tablets

Based off the patch originally written by Carlos Garnacho

Signed-off-by: Stephen Chandler Paul <thatslyude@gmail.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
test: Add test for bad distance events

There's a special distance on wacom tablets where the stylus is close enough to
be (sort of) recongnized by the tablet, but not close enough to send any useful
data. When the pen's in this distance, it will send a distance event with the
value absinfo->maximum or absinfo->minimum, but no other events. Since that
gives the caller the false impression that the tablet is actually in useful
proximity of the tablet, we want to make sure we filter out any events like
this.

Signed-off-by: Stephen Chandler Paul <thatslyude@gmail.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
test: Add tests for normalization

Signed-off-by: Stephen Chandler Paul <thatslyude@gmail.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>