pbnify 0.2.1

Converts images into a series of PBN (Paint By Numbers) commands.
Documentation 
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// Copyright (C) 2019  Adam Gausmann
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

//! Converts images to commands for dwangoAC's Paint By Numbers.

pub mod quantize;

pub use image;

use image::{GenericImageView, Pixel};
use num_traits::cast::ToPrimitive;
use std::collections::{BTreeMap, BTreeSet};
use std::fmt::Write;

pub struct PbnConfig {
    pub x_offset: u32,
    pub y_offset: u32,
    pub max_length: usize,
}

impl PbnConfig {
    pub fn new() -> PbnConfig {
        PbnConfig {
            x_offset: 0,
            y_offset: 0,
            max_length: 400,
        }
    }

    pub fn x_offset(self, x_offset: u32) -> PbnConfig {
        PbnConfig { x_offset, ..self }
    }

    pub fn y_offset(self, y_offset: u32) -> PbnConfig {
        PbnConfig { y_offset, ..self }
    }

    pub fn max_length(self, max_length: usize) -> PbnConfig {
        PbnConfig { max_length, ..self }
    }

    pub fn run<I: GenericImageView>(&self, image: &I) -> Vec<String> {
        let &PbnConfig {
            x_offset,
            y_offset,
            max_length,
        } = self;

        let mut colors: BTreeMap<[u8; 4], BTreeSet<(u32, u32)>> = BTreeMap::new();
        for (x, y, p) in image.pixels() {
            let [r, g, b, a] = p.to_rgba().data;
            if a.to_u8().unwrap() != 0 {
                colors
                    .entry([
                        r.to_u8().unwrap(),
                        g.to_u8().unwrap(),
                        b.to_u8().unwrap(),
                        a.to_u8().unwrap(),
                    ])
                    .or_insert_with(BTreeSet::new)
                    .insert((x, y));
            }
        }

        let mut commands = Vec::new();
        let mut buf;
        let mut pixbuf = String::new();
        for (&[r, g, b, a], pixels) in &colors {
            buf = String::with_capacity(max_length);
            write!(buf, "#{:02x}{:02x}{:02x}{:02x} ", r, g, b, a).unwrap();

            for &(x, y) in pixels {
                pixbuf.clear();
                write!(pixbuf, "{},{};", x + x_offset + 1, y + y_offset + 1).unwrap();

                if buf.len() + pixbuf.len() > max_length {
                    commands.push(buf);
                    buf = String::with_capacity(max_length);
                    write!(buf, "#{:02x}{:02x}{:02x}{:02x} ", r, g, b, a).unwrap();
                }

                buf.push_str(&pixbuf);
            }
            commands.push(buf);
        }
        commands
    }
}

impl Default for PbnConfig {
    fn default() -> PbnConfig {
        PbnConfig::new()
    }
}