//! Decode an image with the exact decoder the hero pipeline uses (the `image`
//! crate) and write lossless PNG. Lets the live-GPU hero prototype consume
//! bit-identical pixels to the baked path — browsers decode JPEG chroma
//! differently, which showed up as a subtle tint in A/B comparisons.
//!
//! Usage: decode_to_png <input.jpg> <output.png>

fn main() {
    let mut args = std::env::args().skip(1);
    let (Some(input), Some(output)) = (args.next(), args.next()) else {
        eprintln!("usage: decode_to_png <input> <output.png>");
        std::process::exit(2);
    };
    let bytes = std::fs::read(&input).expect("read input");
    let decoded = image::load_from_memory(&bytes).expect("decode");
    decoded
        .save_with_format(&output, image::ImageFormat::Png)
        .expect("write png");
    println!(
        "{} {}x{} -> {}",
        input,
        decoded.width(),
        decoded.height(),
        output
    );
}