Function _lv_obj_style_create_transition 

pub unsafe extern "C" fn _lv_obj_style_create_transition(
    obj: *mut _lv_obj_t,
    part: lv_part_t,
    prev_state: lv_state_t,
    new_state: lv_state_t,
    tr: *const _lv_obj_style_transition_dsc_t,
)