png2gu

Cargo.toml

[package]
name = "png2gu"
version = "0.1.0"
authors = ["Paul Sajna <sajattack@gmail.com>"]
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
png = "0.16"

main.rs

use png;
use std::fs::File;
use std::io::Write;

fn main() {
    let args: Vec<String> = std::env::args().collect();
    let in_path = args[1].clone(); 
    let out_path = args[2].clone();
    
    let mut decoder = png::Decoder::new(File::open(in_path).unwrap());
    decoder.set_transformations(png::Transformations::BGR);
    let (info, mut reader) = decoder.read_info().unwrap(); 
    let mut buf = vec![0; info.buffer_size()];
    reader.next_frame(&mut buf).unwrap();

    let mut output_file = File::create(out_path).unwrap();
    output_file.write(&buf).unwrap();
}