build.rs

use image::Rgba;
use slint_build::CompilerConfiguration;
use std::{env, fs, path::Path};

const DARK_INACTIVE_PNG_ICON: &[u8] = include_bytes!("assets/icon-dark-inactive.png");
const DARK_ACTIVE_PNG_ICON: &[u8] = include_bytes!("assets/icon-dark-active.png");
const LIGHT_INACTIVE_PNG_ICON: &[u8] = include_bytes!("assets/icon-light-inactive.png");
const LIGHT_ACTIVE_PNG_ICON: &[u8] = include_bytes!("assets/icon-light-active.png");

fn convert(img: &[u8]) -> Result<Vec<u8>, image::ImageError> {
    let img = image::load_from_memory(img)?;
    let mut img = img.to_rgba8();

    for Rgba(pixel) in img.pixels_mut() {
        *pixel = u32::from_be_bytes(*pixel).rotate_right(8).to_be_bytes();
    }

    Ok(img.into_raw())
}

fn main() {
    slint_build::compile_with_config(
        "ui/main.slint",
        CompilerConfiguration::new().with_style("fluent-dark".to_string()),
    )
    .unwrap();

    if env::var_os("CARGO_CFG_TARGET_OS").unwrap() == "linux" {
        let out_dir = &env::var_os("OUT_DIR").unwrap();
        let out_path = Path::new(out_dir);

        fs::write(
            out_path.join("linux-dark-inactive-icon"),
            convert(DARK_INACTIVE_PNG_ICON).unwrap(),
        )
        .unwrap();
        fs::write(
            out_path.join("linux-dark-active-icon"),
            convert(DARK_ACTIVE_PNG_ICON).unwrap(),
        )
        .unwrap();
        fs::write(
            out_path.join("linux-light-inactive-icon"),
            convert(LIGHT_INACTIVE_PNG_ICON).unwrap(),
        )
        .unwrap();
        fs::write(
            out_path.join("linux-light-active-icon"),
            convert(LIGHT_ACTIVE_PNG_ICON).unwrap(),
        )
        .unwrap();
    }

    if env::var_os("CARGO_CFG_TARGET_OS").unwrap() == "windows" {
        embed_resource::compile("assets/icons.rc", embed_resource::NONE);
    }

    println!("cargo:rerun-if-changed=assets/icons.rc");
    println!("cargo:rerun-if-changed=assets/icon-dark-inactive.ico");
    println!("cargo:rerun-if-changed=assets/icon-dark-active.ico");
    println!("cargo:rerun-if-changed=assets/icon-light-inactive.ico");
    println!("cargo:rerun-if-changed=assets/icon-light-active.ico");
    println!("cargo:rerun-if-changed=build.rs");
}