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11
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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3
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# mandelbrot-rs
|
||||
|
||||
Implementation of mandelbrot renderer in rust, as described in [Programming Rust: Fast, Safe Systems Development](https://www.oreilly.com/library/view/programming-rust-2nd/9781492052586/)
|
||||
BIN
mandel.png
Executable file
BIN
mandel.png
Executable file
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After 
(image error) Size: 19 MiB |
BIN
mandelbrot.png
Executable file
BIN
mandelbrot.png
Executable file
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After 
(image error) Size: 137 KiB |
165
src/main.rs
Executable file
165
src/main.rs
Executable file
@ -0,0 +1,165 @@
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use num::Complex;
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use std::str::FromStr;
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use image::ColorType;
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use image::png::PNGEncoder;
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use std::fs::File;
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use std::io::Write;
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use crossbeam;
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fn escape_time(c: Complex<f64>, limit: u32) -> Option<u32> {
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let mut z = Complex {re: 0.0, im: 0.0};
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for i in 0..limit {
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z = z * z + c;
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if z.norm_sqr() > 4.0 {
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return Some(i);
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}
|
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}
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|
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None
|
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}
|
||||
|
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fn parse_pair<T: FromStr>(s: &str, separator: char) -> Option<(T,T)> {
|
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s.find(separator).and_then(|i| {
|
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match (T::from_str(&s[..i]), T::from_str(&s[i + 1..])) {
|
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(Ok(l), Ok(r)) => Some((l,r)),
|
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_ => None
|
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}
|
||||
|
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})
|
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}
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#[test]
|
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fn test_parse_pair() {
|
||||
assert_eq!(parse_pair::<i32>("", ','), None);
|
||||
assert_eq!(parse_pair::<i32>("10,", ','), None);
|
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assert_eq!(parse_pair::<i32>(",10", ','), None);
|
||||
assert_eq!(parse_pair::<i32>("10,20", ','), Some((10, 20)));
|
||||
assert_eq!(parse_pair::<i32>("10,20xy", ','), None);
|
||||
assert_eq!(parse_pair::<f64>("0.5x", 'x'), None);
|
||||
assert_eq!(parse_pair::<f64>("0.5x1.5", 'x'), Some((0.5, 1.5)));
|
||||
}
|
||||
|
||||
fn parse_complex(s: &str) -> Option<Complex<f64>> {
|
||||
parse_pair(s, ',').and_then(|(re, im)| Some(Complex {re, im}))
|
||||
// match parse_pair(s, ',') {
|
||||
// None => None
|
||||
// Some((re, im))
|
||||
// }
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_parse_complex() {
|
||||
assert_eq!(parse_complex("1.25,-0.0625"),
|
||||
Some(Complex { re: 1.25, im: -0.0625 }));
|
||||
assert_eq!(parse_complex(",-0.0625"), None);
|
||||
}
|
||||
|
||||
fn pixel_to_point(bounds: (usize, usize),
|
||||
pixel: (usize, usize),
|
||||
upper_left: Complex<f64>,
|
||||
lower_right: Complex<f64>) -> Complex<f64> {
|
||||
let (width, height) = (lower_right.re - upper_left.re,
|
||||
upper_left.im - lower_right.im);
|
||||
Complex {
|
||||
re: upper_left.re + pixel.0 as f64 * width / bounds.0 as f64,
|
||||
im: upper_left.im - pixel.1 as f64 * height / bounds.1 as f64
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_pixel_to_point() {
|
||||
assert_eq!(pixel_to_point((100, 200), (25, 175),
|
||||
Complex { re: -1.0, im: 1.0 },
|
||||
Complex { re: 1.0, im: -1.0 }),
|
||||
Complex { re: -0.5, im: -0.75 });
|
||||
}
|
||||
|
||||
fn render(pixels: &mut [u8],
|
||||
bounds: (usize, usize),
|
||||
upper_left: Complex<f64>,
|
||||
lower_right: Complex<f64>) {
|
||||
|
||||
assert!(pixels.len() == bounds.0 * bounds.1);
|
||||
|
||||
for row in 0 .. bounds.1 {
|
||||
for column in 0 .. bounds.0 {
|
||||
let point = pixel_to_point(bounds, (column,row), upper_left, lower_right);
|
||||
pixels[row * bounds.0 + column] =
|
||||
match escape_time(point, 255) {
|
||||
None => 0,
|
||||
Some(count) => 255 - count as u8
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
use std::io::Result;
|
||||
|
||||
fn write_image(filename: &str, pixels: &[u8], bounds: (usize, usize)) -> Result<()> {
|
||||
let output = File::create(filename)?;
|
||||
// let output = match File::create(filename) {
|
||||
// Ok(f) => { f },
|
||||
// Err(e) => { return Err(e); }
|
||||
// }
|
||||
|
||||
let encoder = PNGEncoder::new(output);
|
||||
|
||||
encoder.encode(&pixels, bounds.0 as u32, bounds.1 as u32, ColorType::Gray(8))?;
|
||||
// match encoder.encode(&pixels, bounds.0 as u32, bounds.1 as u32, ColorType::Gray(8)) {
|
||||
// Ok(_) => { () },
|
||||
// _ => { return Err(std::io::Error::new(std::io::ErrorKind::Other, "oh no!")); }
|
||||
// };
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn single_threaded_render(pixels: &mut [u8],
|
||||
bounds: (usize, usize),
|
||||
upper_left: Complex<f64>,
|
||||
lower_right: Complex<f64>) {
|
||||
render(pixels, bounds, upper_left, lower_right);
|
||||
}
|
||||
|
||||
fn multi_threaded_render(pixels: &mut [u8],
|
||||
bounds: (usize, usize),
|
||||
upper_left: Complex<f64>,
|
||||
lower_right: Complex<f64>) {
|
||||
let threads = 8;
|
||||
let rows_per_band = bounds.1 / threads + 1;
|
||||
|
||||
let bands: Vec<&mut [u8]> = pixels.chunks_mut(rows_per_band * bounds.0).collect();
|
||||
crossbeam::scope(|spawner| {
|
||||
for (i, band) in bands.into_iter().enumerate() {
|
||||
let top = rows_per_band * i;
|
||||
let height = band.len() / bounds.0;
|
||||
let band_bounds = (bounds.0, height);
|
||||
let band_upper_left = pixel_to_point(bounds, (0, top), upper_left, lower_right);
|
||||
let band_lower_right = pixel_to_point(bounds, (bounds.0, top + height), upper_left, lower_right);
|
||||
|
||||
spawner.spawn(move |_| {
|
||||
render(band, band_bounds, band_upper_left, band_lower_right);
|
||||
});
|
||||
}
|
||||
});
|
||||
|
||||
}
|
||||
|
||||
fn main() {
|
||||
let args: Vec<String> = std::env::args().collect();
|
||||
if args.len() != 5 {
|
||||
writeln!(std::io::stderr(), "Usage: mandelbrot FILE PIXELS UPPERLEFT LOWERRIGHT").unwrap();
|
||||
writeln!(std::io::stderr(), "Example: {} mandel.png 1000x750 -1.20,0.35 -1,0.20", args[0]).unwrap();
|
||||
std::process::exit(1);
|
||||
}
|
||||
|
||||
let bounds = parse_pair(&args[2], 'x').expect("error parsing image dimensions");
|
||||
let upper_left = parse_complex(&args[3]).expect("error parsing upper left corner point");
|
||||
let lower_right = parse_complex(&args[4]).expect("error parsing lower right corner point");
|
||||
|
||||
let mut pixels = vec![0; bounds.0 * bounds.1];
|
||||
|
||||
multi_threaded_render(&mut pixels, bounds, upper_left, lower_right);
|
||||
// single_threaded_render(&mut pixels, bounds, upper_left, lower_right);
|
||||
|
||||
write_image(&args[1], &pixels, bounds).expect("error writing PNG file");
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user