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tablet: disable smoothing for uinput devices

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When a tablet was created via uinput we trust that the
tablet's events are preprocessed to the point where we
no longer need to apply smoothing to the axes.

Closes #1120

Part-of: <https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/1219>
This commit is contained in:
Peter Hutterer 2025-06-09 10:00:50 +10:00 • committed by Marge Bot
parent 3b52569864
commit 5d23794d53
1 changed files with 6 additions and 4 deletions
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10
src/evdev-tablet.c
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@ -2838,7 +2838,8 @@ tablet_is_aes(struct evdev_device *device, WacomDevice *wacom)
static void
tablet_init_smoothing(struct evdev_device *device,
struct tablet_dispatch *tablet,
bool is_aes)
bool is_aes,
bool is_virtual)
{
size_t history_size = ARRAY_LENGTH(tablet->history.samples);
struct quirks_context *quirks = NULL;
@ -2848,11 +2849,11 @@ tablet_init_smoothing(struct evdev_device *device,
quirks = evdev_libinput_context(device)->quirks;
q = quirks_fetch_for_device(quirks, device->udev_device);
/* By default, always enable smoothing except on AES devices.
/* By default, always enable smoothing except on AES or uinput devices.
* AttrTabletSmoothing can override this, if necessary.
*/
if (!q || !quirks_get_bool(q, QUIRK_ATTR_TABLET_SMOOTHING, &use_smoothing))
use_smoothing = !is_aes;
use_smoothing = !is_aes && !is_virtual;
/* Setting the history size to 1 means we never do any actual smoothing. */
if (!use_smoothing)
@ -2986,6 +2987,7 @@ tablet_init(struct tablet_dispatch *tablet,
goto out;
bool is_aes = tablet_is_aes(device, wacom);
bool is_virtual = evdev_device_is_virtual(device);
bool is_display_tablet = tablet_is_display_tablet(wacom);
if (!libevdev_has_event_code(evdev, EV_KEY, BTN_TOOL_PEN)) {
@ -3010,7 +3012,7 @@ tablet_init(struct tablet_dispatch *tablet,
evdev_init_sendevents(device, &tablet->base);
tablet_init_left_handed(device, wacom);
tablet_init_smoothing(device, tablet, is_aes);
tablet_init_smoothing(device, tablet, is_aes, is_virtual);
for (axis = LIBINPUT_TABLET_TOOL_AXIS_X;
axis <= LIBINPUT_TABLET_TOOL_AXIS_MAX;