T24: the icon, Ely holding a terminal, drawn in SVG: on macOS's rounded square, and alone and flat for Windows and Linux; scripts/mac-app.sh builds ELYTerminal.app, signed ad hoc, and its disk image, its icon rendered by examples/icons.rs through resvg

examples/icons.rs

@@ -0,0 +1,33 @@
+//! Renders an SVG into a macOS iconset: `icons SVG FOLDER`.
+
+use std::path::Path;
+
+use anyhow::Context as _;
+use resvg::{tiny_skia, usvg};
+
+fn main() -> anyhow::Result<()> {
+    let mut args = std::env::args().skip(1);
+    let svg = args.next().context("icons: name an SVG to render")?;
+    let out = args
+        .next()
+        .context("icons: name an iconset folder to write")?;
+    let data = std::fs::read(&svg).with_context(|| format!("icons: cannot read {svg}"))?;
+    let tree = usvg::Tree::from_data(&data, &usvg::Options::default())
+        .with_context(|| format!("icons: {svg} is not an SVG"))?;
+    std::fs::create_dir_all(&out).with_context(|| format!("icons: cannot make {out}"))?;
+    for points in [16, 32, 128, 256, 512] {
+        for (scale, suffix) in [(1, ""), (2, "@2x")] {
+            let side = points * scale;
+            let mut pixmap = tiny_skia::Pixmap::new(side, side).context("icons: no pixmap")?;
+            let fit = side as f32 / tree.size().width();
+            let transform = tiny_skia::Transform::from_scale(fit, fit);
+            resvg::render(&tree, transform, &mut pixmap.as_mut());
+            let png = Path::new(&out).join(format!("icon_{points}x{points}{suffix}.png"));
+            pixmap
+                .save_png(&png)
+                .with_context(|| format!("icons: cannot write {}", png.display()))?;
+        }
+    }
+    println!("icons: {svg} drawn into {out}");
+    Ok(())
+}