Function font 

pub unsafe fn font(
    text: *const u8,
    x: i32,
    y: i32,
    trans_colors: *const u8,
    trans_count: i8,
    char_width: i8,
    char_height: i8,
    fixed: bool,
    scale: i32,
    alt: bool,
) -> i32

Safety:

This is normally an external function that is unsafe