Vendor things

third-party/vendor/winit/examples/window_icon.rs

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+#![allow(clippy::single_match)]
+
+use std::path::Path;
+
+use simple_logger::SimpleLogger;
+use winit::{
+    event::Event,
+    event_loop::EventLoop,
+    window::{Icon, WindowBuilder},
+};
+
+fn main() {
+    SimpleLogger::new().init().unwrap();
+
+    // You'll have to choose an icon size at your own discretion. On X11, the desired size varies
+    // by WM, and on Windows, you still have to account for screen scaling. Here we use 32px,
+    // since it seems to work well enough in most cases. Be careful about going too high, or
+    // you'll be bitten by the low-quality downscaling built into the WM.
+    let path = concat!(env!("CARGO_MANIFEST_DIR"), "/examples/icon.png");
+
+    let icon = load_icon(Path::new(path));
+
+    let event_loop = EventLoop::new();
+
+    let window = WindowBuilder::new()
+        .with_title("An iconic window!")
+        // At present, this only does anything on Windows and X11, so if you want to save load
+        // time, you can put icon loading behind a function that returns `None` on other platforms.
+        .with_window_icon(Some(icon))
+        .build(&event_loop)
+        .unwrap();
+
+    event_loop.run(move |event, _, control_flow| {
+        control_flow.set_wait();
+
+        if let Event::WindowEvent { event, .. } = event {
+            use winit::event::WindowEvent::*;
+            match event {
+                CloseRequested => control_flow.set_exit(),
+                DroppedFile(path) => {
+                    window.set_window_icon(Some(load_icon(&path)));
+                }
+                _ => (),
+            }
+        }
+    });
+}
+
+fn load_icon(path: &Path) -> Icon {
+    let (icon_rgba, icon_width, icon_height) = {
+        let image = image::open(path)
+            .expect("Failed to open icon path")
+            .into_rgba8();
+        let (width, height) = image.dimensions();
+        let rgba = image.into_raw();
+        (rgba, width, height)
+    };
+    Icon::from_rgba(icon_rgba, icon_width, icon_height).expect("Failed to open icon")
+}