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libweston: add API to get touch device list

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Add API for plugins to retrieve touch device list for initializing touch
devices at startup.

Signed-off-by: liang zhou <liang.zhou@gehealthcare.com>
This commit is contained in:
liang zhou 2026-05-15 13:10:13 +08:00 • committed by liang zhou
parent 1269a908d5
commit d774dba68a
2 changed files with 68 additions and 0 deletions
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14
include/libweston/libweston.h
View file

@ -2919,6 +2919,20 @@ uint64_t
weston_client_new_internal_id(struct weston_compositor *compositor,
struct weston_client *client);
/** Container for an array of touch devices. */
struct weston_touch_device_list {
/** Length of \c array. */
size_t len;
/** Pointer to an array of touch device pointers. */
struct weston_touch_device **array;
};
struct weston_touch_device_list
weston_compositor_get_touch_devices(struct weston_compositor *compositor);
void
weston_touch_device_list_release(struct weston_touch_device_list *list);
#ifdef __cplusplus
}
#endif

54
libweston/compositor.c
View file

@ -11257,3 +11257,57 @@ weston_backend_clear_deferred(struct weston_backend *backend,
weston_output_schedule_repaint(output);
}
}
/**
* Get a list of all touch devices as an array of pointers.
*
* The pointers in the array remain valid until any touch device is
* destroyed. Do not store the array or any of the pointers for later
* use without adding destroy signal handlers for each stored pointer.
*
* \param compositor The compositor instance.
*
* \return A list of touch devices.
*
* \ingroup compositor
*/
WL_EXPORT struct weston_touch_device_list
weston_compositor_get_touch_devices(struct weston_compositor *compositor)
{
struct wl_array arr;
struct weston_seat *seat;
struct weston_touch_device *device;
struct weston_touch_device **entry;
wl_array_init(&arr);
wl_list_for_each(seat, &compositor->seat_list, link) {
if (!seat->touch_state)
continue;
wl_list_for_each(device, &seat->touch_state->device_list, link) {
entry = wl_array_add(&arr, sizeof *entry);
abort_oom_if_null(entry);
*entry = device;
}
}
return (struct weston_touch_device_list){
.len = arr.size / sizeof(struct weston_touch_device *),
.array = arr.data
};
}
/**
* Free the memory allocated by weston_compositor_get_touch_devices
*
* \param list List of touch devices
*
* \ingroup compositor
*/
WL_EXPORT void
weston_touch_device_list_release(struct weston_touch_device_list *list)
{
free(list->array);
list->len = 0;
list->array = NULL;
}