rust_imagemagick_webp2gif.rs

use std::fs::File;
use std::io::Read;
use std::io::Write;
use std::process::Stdio;
use std::process::Command;

fn webp2gif(data: Vec<u8>) -> Vec<u8> {
    let mut conv = Command::new("convert")
        .stdin(Stdio::piped())
        .stdout(Stdio::piped())
        .arg("fd:0")
        .arg("-delay")
        .arg("10")
        .arg("-dispose")
        .arg("none")
        .arg("-coalesce")
        .arg("-loop")
        .arg("0")
        .arg("-background")
        .arg("white")
        .arg("-alpha")
        .arg("remove")
        .arg("gif:fd:1")
        .spawn()
        .unwrap();
        
        {
            let stdin = conv.stdin.as_mut().expect("Failed to open stdin");
            stdin.write_all(&data).expect("Failed to write to stdin");
        }

        let output = conv.wait_with_output().expect("Failed to read stdout");
        output.stdout
}

fn main() {
    let mut f = File::open("input.webp").unwrap();
    let mut f1 = File::create("o.gif").unwrap();

    let mut v = Vec::new();
    f.read_to_end(&mut v).unwrap();
    f1.write_all(&webp2gif(v)).unwrap();
}