Function lvgl_sys::_lv_txt_get_width

pub unsafe extern "C" fn _lv_txt_get_width(
    txt: *const c_char, 
    length: u32, 
    font: *const lv_font_t, 
    letter_space: lv_coord_t, 
    flag: lv_txt_flag_t
) -> lv_coord_t