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use std::{cmp::Ordering, collections::HashMap, env::args, time::Instant};
use image::{io::Reader as ImageReader};
use image::Rgb;
fn main() {
let before = Instant::now();
let filename = std::env::args().skip(1).next().unwrap();
let outname = std::env::args().skip(2).next().unwrap();
// The percent of RGB value difference a color has to surpass to be considere unique
let tolerance = 0.3;
let rgb_tolerance = (256.0 * tolerance) as u16;
let max_colors = 256;
println!("File is {}", &filename);
let imageread = ImageReader::open(&filename).expect("Failed to open image!");
let mut image = imageread.decode().expect("Failed to decode image!").into_rgb8();
println!("Decoded!");
let before_algo = Instant::now();
let mut colors: HashMap<Rgb<u8>, usize> = HashMap::new();
for pixel in image.pixels() {
match colors.get_mut(pixel) {
None => {
colors.insert(*pixel, 1);
},
Some(n) => {
*n += 1
}
}
}
println!("{} has {} colors in it. Sorting most occuring to least...", filename, colors.len());
let mut sorted: Vec<(Rgb<u8>, usize)> = colors.into_iter().collect();
sorted.sort_by(|a, b| {
match a.1.cmp(&b.1) {
Ordering::Equal => {
match a.0.0[0].cmp(&b.0.0[0]) {
Ordering::Equal => {
match a.0.0[1].cmp(&b.0.0[1]) {
Ordering::Equal => {
match a.0.0[2].cmp(&b.0.0[2]) {
Ordering::Equal => {
panic!("Same color in count map, what?")
},
Ordering::Greater => Ordering::Less,
Ordering::Less => Ordering::Greater
}
},
Ordering::Greater => Ordering::Less,
Ordering::Less => Ordering::Greater
}
},
Ordering::Greater => Ordering::Less,
Ordering::Less => Ordering::Greater
}
},
Ordering::Greater => Ordering::Less,
Ordering::Less => Ordering::Greater
}
});
println!("Sorted! Selecting colors...");
for (color, count) in sorted.iter().take(10) {
println!("{:?} count {}", color, count);
}
let mut sorted_iter = sorted.iter();
let mut selected_colors: Vec<Rgb<u8>> = Vec::with_capacity(max_colors);
selected_colors.push(sorted_iter.next().unwrap().0);
for (key, _value) in sorted_iter {
if selected_colors.len() < max_colors {
for selected_color in selected_colors.iter() {
if rgb_difference(key, selected_color) > rgb_tolerance {
selected_colors.push(*key);
break;
}
}
} else {
break;
}
}
for color in selected_colors.iter().take(10) {
println!("selected {:?}", color);
}
println!("Selected {} colors! Creating map...", selected_colors.len());
let mut color_map: HashMap<Rgb<u8>, Rgb<u8>> = HashMap::with_capacity(sorted.len());
// Selected colors are themselves
for color in selected_colors.iter() {
color_map.insert(*color, *color);
}
// Max complexity is O(n * max_colors)
'sorted_colors: for (key, _value) in sorted.iter() {
let mut min_difference = 769; // One greater than the max difference
let mut min_difference_color = *key;
for index in 0..selected_colors.len() {
let difference = rgb_difference(key, unsafe { selected_colors.get_unchecked(index) });
if difference == 0 {
continue 'sorted_colors;
}
if difference < min_difference {
min_difference = difference;
min_difference_color = unsafe {*selected_colors.get_unchecked(index) };
}
}
color_map.insert(*key, min_difference_color);
}
println!("Mapped! Filling in image...");
for pixel in image.pixels_mut() {
pixel.clone_from(color_map.get(pixel).unwrap());
}
println!("Filled! Took {}ms. Recounting colors...", Instant::now().duration_since(before_algo).as_millis());
let mut recounted_colors = Vec::with_capacity(max_colors);
// Recount colors
for pixel in image.pixels() {
if !recounted_colors.contains(pixel) {
recounted_colors.push(*pixel);
}
}
println!("Aiming for a max of {} colors, got {}", max_colors, recounted_colors.len());
image.save(outname).expect("Failed to write out");
println!("Took {}ms", Instant::now().duration_since(before).as_millis());
}
fn rgb_difference(a: &Rgb<u8>, b: &Rgb<u8>) -> u16 {
//((a.0[0] as i16 - b.0[0] as i16).abs() + (a.0[1] as i16 - b.0[1] as i16).abs() +(a.0[2] as i16 - b.0[2] as i16).abs()) as u16
//(a.0[0] as i16 - b.0[0] as i16).abs().max((a.0[1] as i16 - b.0[1] as i16).abs().max(a.0[2] as i16 - b.0[2] as i16).abs()) as u16
(a.0[0] as i16 - b.0[0] as i16).abs().max((a.0[1] as i16 - b.0[1] as i16).abs()).max((a.0[2] as i16 - b.0[2] as i16).abs()) as u16
}
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