pub unsafe extern "C" fn lv_draw_character(
layer: *mut lv_layer_t,
dsc: *mut lv_draw_label_dsc_t,
point: *const lv_point_t,
unicode_letter: u32,
)pub unsafe extern "C" fn lv_draw_character(
layer: *mut lv_layer_t,
dsc: *mut lv_draw_label_dsc_t,
point: *const lv_point_t,
unicode_letter: u32,
)