gif_maker.rs

#!/usr/bin/env cargo
//! ```cargo
//! [dependencies]
//! image = "0.25"
//! ```

use image::codecs::gif::{GifEncoder, Repeat};
use image::{Delay, Frame, Rgba, RgbaImage};
use std::fs::File;
use std::time::Duration;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    // 1. Setup the output file
    let file_out = File::create("rgb_cycle.gif")?;
    let mut encoder = GifEncoder::new(file_out);

    // 2. Configure the animation loop (Repeat::Infinite means loop forever)
    encoder.set_repeat(Repeat::Infinite)?;

    // 3. Define our animation parameters
    let width = 32;
    let height = 32;
    
    // Colors (Red, Green, Blue) with Alpha channel (255)
    let colors = vec![
        Rgba([255, 0, 0, 255]),   // Red
        Rgba([0, 255, 0, 255]),   // Green
        Rgba([0, 0, 255, 255]),   // Blue
    ];

    // 500ms delay
    let delay = Delay::from_saturating_duration(Duration::from_millis(500));

    // 4. Create and write frames
    let frames: Vec<Frame> = colors
        .into_iter()
        .map(|color| {
            let mut image_buffer = RgbaImage::new(width, height);
            
            for pixel in image_buffer.pixels_mut() {
                *pixel = color;
            }

            Frame::from_parts(image_buffer, 0, 0, delay)
        })
        .collect();

    // 5. Encode
    encoder.encode_frames(frames.into_iter())?;

    println!("Success! 'rgb_cycle.gif' has been created.");
    Ok(())
}

Z justfile

set shell := ["sh", "-c"]
set windows-shell := ["powershell", "-c"]

run:
  cargo -Z script gif_maker.rs