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|
use regex::Regex;
use std::env;
use std::fs::File;
use std::io::prelude::*;
use std::io::{BufReader, BufWriter, Write};
use std::path::Path;
use std::process;
fn main() {
if let Err(e) = system_deps::Config::new().probe() {
eprintln!("{e}");
process::exit(1);
}
generate_srgb_tables();
write_version();
}
/// 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);
}
fn write_version() {
let mut major = None;
let mut minor = None;
let mut micro = None;
{
let file = File::open("../configure.ac")
.expect("builds must take place within the librsvg source tree");
let major_regex = Regex::new(r#"^m4_define\(\[rsvg_major_version\],\[(\d+)\]\)"#).unwrap();
let minor_regex = Regex::new(r#"^m4_define\(\[rsvg_minor_version\],\[(\d+)\]\)"#).unwrap();
let micro_regex = Regex::new(r#"^m4_define\(\[rsvg_micro_version\],\[(\d+)\]\)"#).unwrap();
for line in BufReader::new(file).lines() {
match line {
Ok(line) => {
if let Some(nums) = major_regex.captures(&line) {
major = Some(String::from(
nums.get(1).expect("major_regex matched once").as_str(),
));
} else if let Some(nums) = minor_regex.captures(&line) {
minor = Some(String::from(
nums.get(1).expect("minor_regex matched once").as_str(),
));
} else if let Some(nums) = micro_regex.captures(&line) {
micro = Some(String::from(
nums.get(1).expect("micro_regex matched once").as_str(),
));
}
}
Err(e) => panic!("could not parse version from configure.ac: {e}"),
}
}
}
let output = Path::new(&env::var("OUT_DIR").unwrap()).join("version.rs");
let mut file = File::create(output).expect("open version.rs for writing");
file.write_all(
format!(
r#"
use std::os::raw::c_uint;
#[no_mangle]
pub static rsvg_major_version: c_uint = {};
#[no_mangle]
pub static rsvg_minor_version: c_uint = {};
#[no_mangle]
pub static rsvg_micro_version: c_uint = {};
"#,
major.expect("major version is set"),
minor.expect("minor version is set"),
micro.expect("micro version is set")
)
.as_bytes(),
)
.expect("write version.rs");
}
|
