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Merge branch 'common-fixes' into rayon. Update to match 2nd ed text.

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rayon
Jim Blandy 3 years ago
parent e033ce27dc 9fe19ff6ba
commit f10fe6859f
3 changed files with 144 additions and 237 deletions
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4
Cargo.toml
Unescape Escape View File

@ -5,6 +5,6 @@ authors = ["Jim Blandy <jimb@red-bean.com>"]
edition = "2018"
[dependencies]
num = "0.1.34"
num = "0.4"
image = "0.13.0"
rayon = "0.4.0"
rayon = "1"

34
src/main.rs
Unescape Escape View File

@ -1,3 +1,6 @@
#![warn(rust_2018_idioms)]
#![allow(elided_lifetimes_in_paths)]
use num::Complex;
use rayon::prelude::*;
@ -9,13 +12,13 @@ use rayon::prelude::*;
/// origin. If `c` seems to be a member (more precisely, if we reached the
/// iteration limit without being able to prove that `c` is not a member),
/// return `None`.
fn escape_time(c: Complex<f64>, limit: u32) -> Option<u32> {
fn escape_time(c: Complex<f64>, limit: usize) -> Option<usize> {
let mut z = Complex { re: 0.0, im: 0.0 };
for i in 0..limit {
z = z * z + c;
if z.norm_sqr() > 4.0 {
return Some(i);
}
z = z * z + c;
}
None
@ -95,10 +98,10 @@ fn pixel_to_point(bounds: (usize, usize),
#[test]
fn test_pixel_to_point() {
assert_eq!(pixel_to_point((100, 100), (25, 75),
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: -0.5 });
Complex { re: -0.5, im: -0.75 });
}
/// Render a rectangle of the Mandelbrot set into a buffer of pixels.
@ -114,8 +117,8 @@ fn render(pixels: &mut [u8],
{
assert!(pixels.len() == bounds.0 * bounds.1);
for row in 0 .. bounds.1 {
for column in 0 .. bounds.0 {
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] =
@ -146,19 +149,16 @@ fn write_image(filename: &str, pixels: &[u8], bounds: (usize, usize))
Ok(())
}
use std::io::Write;
use std::env;
fn main() {
let args: Vec<String> = std::env::args().collect();
let args: Vec<String> = 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();
eprintln!("Usage: {} FILE PIXELS UPPERLEFT LOWERRIGHT",
args[0]);
eprintln!("Example: {} mandel.png 1000x750 -1.20,0.35 -1,0.20",
args[0]);
std::process::exit(1);
}
@ -179,7 +179,6 @@ fn main() {
.collect();
bands.into_par_iter()
.weight_max()
.for_each(|(i, band)| {
let top = i;
let band_bounds = (bounds.0, 1);
@ -191,5 +190,6 @@ fn main() {
});
}
write_image(&args[1], &pixels, bounds).expect("error writing PNG file");
write_image(&args[1], &pixels, bounds)
.expect("error writing PNG file");
}

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