mirror of
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New things, documentation
This commit is contained in:
2
fractalart-rs/.gitignore
vendored
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2
fractalart-rs/.gitignore
vendored
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@@ -0,0 +1,2 @@
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||||
target
|
||||
out.png
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||||
216
fractalart-rs/Cargo.lock
generated
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216
fractalart-rs/Cargo.lock
generated
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@@ -0,0 +1,216 @@
|
||||
# This file is automatically @generated by Cargo.
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# It is not intended for manual editing.
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12
fractalart-rs/Cargo.toml
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12
fractalart-rs/Cargo.toml
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@@ -0,0 +1,12 @@
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||||
[package]
|
||||
name = "fractalart"
|
||||
version = "0.1.0"
|
||||
authors = ["osmarks <osmarks@protonmail.com>"]
|
||||
edition = "2018"
|
||||
|
||||
[dependencies]
|
||||
image = { version = "0.23", features = ["png"], default-features = false }
|
||||
nanorand = { version = "0.5", features = ["std", "rdseed", "wyrand", "tls"], default-features = false }
|
||||
hsl = "0.1.1"
|
||||
gumdrop = "0.8"
|
||||
smallvec = "1.4.1"
|
||||
11
fractalart-rs/README.md
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11
fractalart-rs/README.md
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@@ -0,0 +1,11 @@
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||||
# FractalArt-rs
|
||||
|
||||
This is [this](https://github.com/TomSmeets/FractalArt) "fractal" wallpaper thing, ported to Rust and with significant performance improvements and more configuration.
|
||||
It is lacking the set-as-wallpaper feature of the original, but it should be possible to put this in a shellscript or something with whatever works on your platform.
|
||||
|
||||
## Usage
|
||||
|
||||
Compile via `cargo build --release`.
|
||||
The resulting binary is in `target/release/fractalart`. With no other arguments, it will generate a 1000x1000 image and save it to `out.png`. You can use `-W`/`-H`/`-o` to change that.
|
||||
The initial seed color can also be configured with `-u` (hue; this will default to a randomly generated one), `-s` and `-l`. The random seed is set with `-r`; if the other parameters are the same, then the same seed will give the same image.
|
||||
Images generated by this are slightly different to the original program's because of the use of 16-bit integers instead of floats (it might actually be possible to go down to `u8`s without quality problems, but I haven't tried), and also the different default variance (`-v`); the original program hardcodes this to the equivalent of 1573, but I picked 2048, as a rounder number.
|
||||
140
fractalart-rs/src/main.rs
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140
fractalart-rs/src/main.rs
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@@ -0,0 +1,140 @@
|
||||
use image::{Rgb, ImageBuffer, RgbImage};
|
||||
use std::cmp::{max, min};
|
||||
use nanorand::{WyRand, RNG};
|
||||
use gumdrop::Options;
|
||||
use smallvec::{smallvec, SmallVec};
|
||||
|
||||
type R16Image = ImageBuffer<Rgb<u16>, Vec<u16>>;
|
||||
|
||||
// convert HSL to RGB, wrapping the hsl crate
|
||||
fn hsl_to_rgb(h: f64, s: f64, l: f64) -> Rgb<u8> {
|
||||
let (r, g, b) = (hsl::HSL { h, s, l }).to_rgb();
|
||||
Rgb::from([r, g, b])
|
||||
}
|
||||
|
||||
type IPos = (i32, i32);
|
||||
|
||||
// checks if a position is inside the given width/height
|
||||
fn is_inside((w, h): IPos, (x, y): IPos) -> bool {
|
||||
x < w && y < h && x >= 0 && y >= 0
|
||||
}
|
||||
|
||||
// generate a square "ring" around a point with supplied distance
|
||||
// drops all values outside of grid
|
||||
fn ring_at(dim: IPos, (x, y): IPos, l: i32) -> impl Iterator<Item = IPos> {
|
||||
// use smallvec for higher efficiency if generating small ring for next_color
|
||||
// it might be better to just have a separate codepath entirely for size-1 rings really
|
||||
// or make it work as an iterator properly
|
||||
let mut out: SmallVec<[_; 8]> = smallvec![];
|
||||
// top and bottom of ring
|
||||
for n in -l..=l {
|
||||
out.push((n + x, l + y));
|
||||
out.push((n + x, -l + y));
|
||||
}
|
||||
// sides of ring
|
||||
for n in (1 - l)..l {
|
||||
out.push((l + x, n + y));
|
||||
out.push((-l + x, n + y));
|
||||
}
|
||||
out.into_iter().filter(move |c| is_inside(dim, *c))
|
||||
}
|
||||
|
||||
// randomly increase/decrease one of the channels in a color by `range`
|
||||
fn mod_channel(rng: &mut WyRand, range: u16, n: u16) -> u16 {
|
||||
// to avoid conversion to signed integers here, do things of some sort
|
||||
let rand: u16 = rng.generate::<u16>() % (range * 2 + 2);
|
||||
let o = ((n as u32) + (rand as u32)).saturating_sub(range as u32);
|
||||
// avoid weird artifacts - just directly using `as` truncates it, i.e. drops the high bytes, which leads to integer-overflow-like issues
|
||||
min(o, 65535) as u16
|
||||
}
|
||||
|
||||
// randomly adjust all the channels in a color by `range`
|
||||
fn mod_color(rng: &mut WyRand, range: u16, col: Rgb<u16>) -> Rgb<u16> {
|
||||
Rgb([mod_channel(rng, range, col[0]), mod_channel(rng, range, col[1]), mod_channel(rng, range, col[2])])
|
||||
}
|
||||
|
||||
// the original Haskell implementation has a grid of booleans and colors for this
|
||||
// doing that in this would probably introduce more complexity and reduce efficiency significantly, so just reserve black for uninitialized pixels
|
||||
const BLANK: Rgb<u16> = Rgb([0, 0, 0]);
|
||||
|
||||
// get the next color to use by randomly selecting an adjacent nonblank pixel and randomizing it a bit
|
||||
fn next_color(opts: &CLIOptions, rng: &mut WyRand, im: &R16Image, pos: IPos) -> Rgb<u16> {
|
||||
let (w, h) = im.dimensions();
|
||||
let dim = (w as i32, h as i32);
|
||||
let mut colors: SmallVec<[_; 8]> = smallvec![];
|
||||
for (x, y) in ring_at(dim, pos, 1) {
|
||||
let px = *im.get_pixel(x as u32, y as u32);
|
||||
if px != BLANK {
|
||||
colors.push(px);
|
||||
}
|
||||
}
|
||||
let chosen = colors[rng.generate_range(0, colors.len())];
|
||||
mod_color(rng, opts.variance / colors.len() as u16, chosen)
|
||||
}
|
||||
|
||||
// run an iteration by filling in all the pixels in a ring around the start position
|
||||
fn iter(opts: &CLIOptions, rng: &mut WyRand, im: &mut R16Image, pos: IPos, i: i32) {
|
||||
let (w, h) = im.dimensions();
|
||||
let dim = (w as i32, h as i32);
|
||||
|
||||
for (x, y) in ring_at(dim, pos, i) {
|
||||
im.put_pixel(x as u32, y as u32, next_color(opts, rng, im, (x, y)));
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Options, Debug)]
|
||||
struct CLIOptions {
|
||||
#[options(help = "width of generated image", short = "H", default = "1000")]
|
||||
width: u32,
|
||||
#[options(help = "height of generated image", short = "W", default = "1000")]
|
||||
height: u32,
|
||||
#[options(help = "filename to save generated image to", short = "o", default = "./out.png")]
|
||||
filename: String,
|
||||
// required for gumdrop to provide help text
|
||||
#[options(help = "display this help", short = "h")]
|
||||
help: bool,
|
||||
#[options(help = "max color channel difference from previous pixel", short = "v", default = "2048")]
|
||||
variance: u16,
|
||||
#[options(help = "base color saturation", short = "s", default = "1.0")]
|
||||
saturation: f64,
|
||||
#[options(help = "base color lightness", short = "l", default = "0.6")]
|
||||
lightness: f64,
|
||||
#[options(help = "base color hue (default: random)", short = "u")]
|
||||
hue: Option<f64>,
|
||||
#[options(help = "random seed (default: random)", short="r")]
|
||||
seed: Option<u64>
|
||||
}
|
||||
|
||||
fn main() {
|
||||
let opts = CLIOptions::parse_args_default_or_exit();
|
||||
println!("{:?}", opts);
|
||||
|
||||
let mut rng = match opts.seed {
|
||||
Some(seed) => nanorand::WyRand::new_seed(seed),
|
||||
None => nanorand::WyRand::new()
|
||||
};
|
||||
let w = opts.width;
|
||||
let h = opts.height;
|
||||
let start_x = rng.generate_range(0, w - 1);
|
||||
let start_y = rng.generate_range(0, h - 1);
|
||||
|
||||
// generate a starting color
|
||||
let hue = opts.hue.unwrap_or_else(|| rng.generate_range(0u64, 360 * 65536) as f64 / 65536.);
|
||||
let start_color = hsl_to_rgb(hue, opts.saturation, opts.lightness);
|
||||
let start_color = Rgb([start_color[0] as u16 * 256, start_color[1] as u16 * 256, start_color[2] as u16 * 256]);
|
||||
|
||||
let iterations = max(max(start_x, w - 1 - start_x), max(start_y, h - 1 - start_y)) as i32;
|
||||
let mut im = R16Image::from_pixel(w, h, BLANK);
|
||||
im.put_pixel(start_x, start_y, start_color);
|
||||
for i in 1..=iterations {
|
||||
iter(&opts, &mut rng, &mut im, (start_x as i32, start_y as i32), i);
|
||||
}
|
||||
|
||||
// discard low bits of image pixels before saving, as monitors mostly can't render these and it wastes space
|
||||
let low_color_depth_image = RgbImage::from_fn(w, h, |x, y| {
|
||||
let Rgb([r, g, b]) = im.get_pixel(x, y);
|
||||
Rgb([(r >> 8) as u8, (g >> 8) as u8, (b >> 8) as u8])
|
||||
});
|
||||
|
||||
low_color_depth_image.save(&opts.filename).expect("failed to save image");
|
||||
}
|
||||
Reference in New Issue
Block a user