pub unsafe extern "C" fn lv_draw_label_iterate_characters(
draw_unit: *mut lv_draw_unit_t,
dsc: *const lv_draw_label_dsc_t,
coords: *const lv_area_t,
cb: Option<unsafe extern "C" fn(_: *mut lv_draw_unit_t, _: *mut lv_draw_glyph_dsc_t, _: *mut lv_draw_fill_dsc_t, _: *const lv_area_t)>,
)