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libinput: deprecate WL_CALIBRATION

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The udev property WL_CALIBRATION is an old way of giving Weston a
touchscreen calibration matrix. It is Weston-specific.

The recommended way of setting up a calibration is to use the udev
property LIBINPUT_CALIBRATION_MATRIX, which libinput will load
automatically and therefore applies to all libinput using display
servers and applications.

The syntax of WL_CALIBRATION and LIBINPUT_CALIBRATION_MATRIX is
different as well: WL_CALIBRATION uses pixels as the translation part
units, which makes the values depend on the output resolution.
LIBINPUT_CALIBRATION_MATRIX on the other hand uses normalized units.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Pekka Paalanen 2018-03-21 14:30:04 +02:00
parent dfc9d3b847
commit ed51b62416
1 changed files with 7 additions and 0 deletions
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7
libweston/libinput-device.c
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@ -500,6 +500,13 @@ evdev_device_set_calibration(struct evdev_device *device)
udev_device_get_property_value(udev_device,
"WL_CALIBRATION");
if (calibration_values) {
weston_log("Warning: input device %s has WL_CALIBRATION property set. "
"Support for it will be removed in the future. "
"Please use LIBINPUT_CALIBRATION_MATRIX instead.\n",
sysname);
}
if (!calibration_values || sscanf(calibration_values,
"%f %f %f %f %f %f",
&calibration[0],