immo 0.1.0

Processing of various images (e.g., drawing of square systems)
Documentation 
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use immo::error::ImageError;
use immo::png::Png;


use std::fs::File;
use std::io::BufWriter;
use std::time::Instant;

const RED: (u8, u8, u8, u8) = (255, 0, 0, 255);
const ORANGE: (u8, u8, u8, u8) = (255, 150, 0, 255);
const YELLOW: (u8, u8, u8, u8) = (255, 240, 0, 255);
const GREEN: (u8, u8, u8, u8) = (0, 135, 0, 255);
const BLUE: (u8, u8, u8, u8) = (0, 145, 255, 255);
const NAVY: (u8, u8, u8, u8) = (0, 100, 190, 255);
const PURPLE: (u8, u8, u8, u8) = (145, 0, 130, 255);

fn main() -> Result<(), ImageError> {
    println!("This process takes approximately one minute for a Debug build.");
    let start = Instant::now();
    let mut png = Png::new(1024, 1024);

    let color = [RED, ORANGE, YELLOW, GREEN, BLUE, NAVY, PURPLE];
    let mut index = 0;

    let mut size = 1024;
    let mut pos = 0;

    for _i in 0..256 {
        if index == 6 {
            index = 0;
        }
        png.draw_rectangle(pos, pos, size, size, 1, color[index])?;
        size -= 4;
        pos += 2;
        index += 1;
    }

    let path = String::from("optical.png");
    let file = File::create(path).unwrap();
    let w = &mut BufWriter::new(file);

    let mut encoder = png::Encoder::new(w, 1024, 1024); // Width is 2 pixels and height is 1.
    encoder.set_color(png::ColorType::Rgba);
    encoder.set_depth(png::BitDepth::Eight);

    let mut writer = encoder.write_header().unwrap();

    writer.write_image_data(png.as_slice()).unwrap();

    let end = start.elapsed();
    println!(
        "{}.{:03} second elapsed.",
        end.as_secs(),
        end.subsec_nanos() / 1_000_000
    );

    Ok(())
}