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tinygif's Issues

[feature request] `from_iter` constructor

Hi,

I'll probably take a look at this myself, creating an issue first incase you can point out it's impossible or any pitfalls.

What I'm after is a from_iter, similar to from_slice but it'd get given an iter which returns u8s instead of a u8 array.
(I'm reading GIF files off of an SD card & the GIFs can be too large for a full one to fit in memory).

It'd pull the headers etc from the input iter, store them same as what happens with the from_slice.
I think it it'd need to return frames as an iterator over frame & would only be able to do 1 loop (since the input iter will get consumed), but other than that I'm not seeing any major issues

Nyan Cat Demo

running_cat.mp4 
let image = tinygif::Gif::<Rgb565>::from_slice(include_bytes!("../../cat.gif")).unwrap();
loop {
    for frame in image.frames() {
        let start = Instant::now();
        frame.draw(&mut display.translated(Point::new(10, 80))).unwrap();
        let elapsed = start.elapsed().as_millis();
        info!("draw {}ms", elapsed);

        let delay_ms = (frame.delay_centis * 10) as u64;
        info!("delay {}", delay_ms);
        if delay_ms > elapsed {
            Timer::after(Duration::from_millis((delay_ms - elapsed) as u64)).await;
        }
    }
}

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