build.rs

use std::fs;

use ico::{IconDirEntry, IconImage};
use resvg::{
    tiny_skia::Pixmap,
    usvg::{Options, Transform, Tree},
};

fn main() {
    const LOGO_RC: &str = "res/logo.rc";
    const LOGO_ICO: &str = "res/logo.ico";
    const LOGO_SVG: &str = "res/logo.svg";
    const SVG_SIZE: f32 = 64.0;
    if !fs::metadata(LOGO_ICO).is_ok() {
        const ICO_SIZE: [u32; 6] = [16, 32, 48, 64, 128, 256];
        let svg_data = fs::read(LOGO_SVG).unwrap();
        let tree = Tree::from_data(&svg_data, &Options::default()).unwrap();
        let mut icon = ico::IconDir::new(ico::ResourceType::Icon);
        for size in ICO_SIZE {
            let mut pixmap = Pixmap::new(size, size).unwrap();
            let scale = size as f32 / SVG_SIZE;
            resvg::render(
                &tree,
                Transform::from_row(scale, 0.0, 0.0, scale, 0.0, 0.0),
                &mut pixmap.as_mut(),
            );
            // pixmap
            //     .save_png(format!("res/logo_{0}x{0}.png", size))
            //     .unwrap();
            let png_data = pixmap.encode_png().unwrap();
            let image = IconImage::read_png(&*png_data).unwrap();
            icon.add_entry(IconDirEntry::encode_as_png(&image).unwrap());
        }
        let ico_file = fs::File::create(LOGO_ICO).unwrap();
        icon.write(ico_file).unwrap();
    }
    embed_resource::compile(LOGO_RC, embed_resource::NONE)
        .manifest_optional()
        .unwrap();
    println!("cargo:rerun-if-changed={LOGO_RC}");
    println!("cargo:rerun-if-changed={LOGO_SVG}");
    println!("cargo:rerun-if-changed={LOGO_ICO}");
}