welp.rs

extern crate gif;

fn make_file() {
    // http://www.piston.rs/image/gif/index.html#encoding-gif-files
    use gif::{Frame, Encoder, Repeat, SetParameter};
    use std::fs::File;
    use std::borrow::Cow;

    let color_map = &[0xFF, 0xFF, 0xFF, 0, 0, 0];
    let (width, height) = (6, 6);
    let mut beacon_states = [[
        0, 0, 0, 0, 0, 0,
        0, 1, 1, 0, 0, 0,
        0, 1, 1, 0, 0, 0,
        0, 0, 0, 1, 1, 0,
        0, 0, 0, 1, 1, 0,
        0, 0, 0, 0, 0, 0,
    ], [
        0, 0, 0, 0, 0, 0,
        0, 1, 1, 0, 0, 0,
        0, 1, 0, 0, 0, 0,
        0, 0, 0, 0, 1, 0,
        0, 0, 0, 1, 1, 0,
        0, 0, 0, 0, 0, 0,
    ]];
    let mut image = File::create("target/beacon.gif").unwrap();;
    let mut encoder = Encoder::new(&mut image, width, height, color_map).unwrap();
    encoder.set(Repeat::Infinite).unwrap();
    for state in &beacon_states {
        let mut frame = Frame::default();
        frame.width = width;
        frame.height = height;
        frame.buffer = Cow::Borrowed(&*state);
        encoder.write_frame(&frame).unwrap();
    }
}

fn read_file() {
    use std::fs::File;
    use gif::Decoder;
    let image = File::open("target/beacon.gif").unwrap();

    let mut decoder = gif::Decoder::new(image).read_info().unwrap();

    while let Some(frame) = decoder.read_next_frame().unwrap() {
        println!("{:?}", frame);
    }
}

fn main() {
    make_file();
    read_file();
}