librsvg 2.61.1

A library to render SVG images to Cairo surfaces. GNOME uses this to render SVG icons. Outside of GNOME, other desktop environments use it for similar purposes. Wikimedia uses it for Wikipedia's SVG diagrams.
Documentation 
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use std::env;
use std::fs::File;
use std::io::{BufWriter, Write};
use std::path::Path;

#[cfg(docsrs)]
fn probe_system_deps() {
    // do not probe libraries since the docs.rs environment doesn't have them
}

#[cfg(not(docsrs))]
fn probe_system_deps() {
    if let Err(e) = system_deps::Config::new().probe() {
        eprintln!("{e}");
        std::process::exit(1);
    }
}

fn main() {
    probe_system_deps();
    generate_srgb_tables();
}

/// Converts an sRGB color value to a linear sRGB color value (undoes the gamma correction).
///
/// The input and the output are supposed to be in the [0, 1] range.
#[inline]
fn linearize(c: f64) -> f64 {
    if c <= (12.92 * 0.0031308) {
        c / 12.92
    } else {
        ((c + 0.055) / 1.055).powf(2.4)
    }
}

/// Converts a linear sRGB color value to a normal sRGB color value (applies the gamma correction).
///
/// The input and the output are supposed to be in the [0, 1] range.
#[inline]
fn unlinearize(c: f64) -> f64 {
    if c <= 0.0031308 {
        12.92 * c
    } else {
        1.055 * c.powf(1f64 / 2.4) - 0.055
    }
}

fn print_table<W, F>(w: &mut W, name: &str, f: F, len: u32)
where
    W: Write,
    F: Fn(f64) -> f64,
{
    writeln!(w, "const {name}: [u8; {len}] = [").unwrap();

    for i in 0..len {
        let x = f(i as f64 / 255.0);
        let v = (x * 255.0).round() as u8;
        writeln!(w, "    {v},").unwrap();
    }

    writeln!(w, "];").unwrap();
}

fn generate_srgb_tables() {
    let path = Path::new(&env::var("OUT_DIR").unwrap()).join("srgb-codegen.rs");
    let mut file = BufWriter::new(File::create(path).unwrap());

    print_table(&mut file, "LINEARIZE", linearize, 256);
    print_table(&mut file, "UNLINEARIZE", unlinearize, 256);
}