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tablet: provide x/y by default in mm off the top/left corner

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Given that tablets may not have the same x/y resolution, raw or normalized
values are mostly meaningless and likely to be handled the wrong way.
Providing x/y in mm is the only constant, meaningful value.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Peter Hutterer 2014-06-17 15:23:13 +10:00
parent bb1dd896ac
commit 797b4b4e5a
2 changed files with 8 additions and 5 deletions
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3
src/evdev-tablet.c
View file

@ -141,6 +141,9 @@ tablet_check_notify_axes(struct tablet_dispatch *tablet,
switch (a) {
case LIBINPUT_TABLET_AXIS_X:
case LIBINPUT_TABLET_AXIS_Y:
tablet->axes[a] = evdev_convert_to_mm(absinfo,
absinfo->value);
break;
case LIBINPUT_TABLET_AXIS_DISTANCE:
tablet->axes[a] = absinfo->value;
break;

10
src/libinput.h
View file

@ -861,11 +861,11 @@ libinput_event_tablet_axis_has_changed(struct libinput_event_tablet *event,
*
* Return the axis value of a given axis for a tablet. The interpretation of the
* value is dependent on the axis:
* - @ref LIBINPUT_TABLET_AXIS_X and @ref LIBINPUT_TABLET_AXIS_Y - the raw X and
* Y coordinates of the tablet tool. By default these are not transformed,
* however libinput provides libinput_event_tablet_get_x_transformed() and
* libinput_event_tablet_get_y_transformed() for transforming each respective
* axis value.
* - @ref LIBINPUT_TABLET_AXIS_X and @ref LIBINPUT_TABLET_AXIS_Y - the X and
* Y coordinates of the tablet tool, in mm from the top left corner of the
* tablet. Use libinput_event_tablet_get_x_transformed() and
* libinput_event_tablet_get_y_transformed() for transforming each
* respective axis value.
* - @ref LIBINPUT_TABLET_AXIS_DISTANCE - Approximately how many millimeters
* away from the tablet's sensor the tool is
* - @ref LIBINPUT_TABLET_AXIS_PRESSURE - The current pressure being applied on