mod common;

use ccvl::*;

const OUTER: image::SRGBA = image::SRGBA {
    r: 0.0,
    g: 1.0,
    b: 0.0,
    a: 1.0,
};
const INNER: image::SRGBA = image::SRGBA {
    r: 0.0,
    g: 0.0,
    b: 1.0,
    a: 1.0,
};

fn main() -> std::process::ExitCode {
    common::process_image(|mut img| {
        let greyscale = img.map(|p| image::Luminance::from(p));
		let thresholded = filter::threshold_auto(greyscale);
        let contours = contour::find(thresholded);
        for contour in contours {
			let n = contour.vertices.len();
			for i in 0..n {
				let (x0, y0) = contour.vertices[i];
				let (x1, y1) = contour.vertices[(i + 1) % n];
				draw::line(x0, y0, x1, y1, &mut img, match contour.kind {
					contour::Kind::Outer => OUTER,
					contour::Kind::Inner => INNER,
				});
			}
        }
        img
    })
}