Function lv_text_get_size

pub unsafe extern "C" fn lv_text_get_size(
    size_res: *mut lv_point_t,
    text: *const i8,
    font: *const lv_font_t,
    letter_space: i32,
    line_space: i32,
    max_width: i32,
    flag: u32,
)