winit-sonoma-fix/examples/window_icon.rs
Kirill Chibisov ed26dd58fd
Propagate error from EventLoop creation
Inner panics could make it hard to trouble shoot the issues and for some
users ints not desirable.

The inner panics were left only when they are used to `assert!` during
development.
2023-08-06 06:03:54 +04:00

65 lines
2.1 KiB
Rust

#![allow(clippy::single_match)]
use std::path::Path;
use simple_logger::SimpleLogger;
use winit::{
event::Event,
event_loop::EventLoop,
window::{Icon, WindowBuilder},
};
#[path = "util/fill.rs"]
mod fill;
fn main() -> Result<(), impl std::error::Error> {
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().unwrap();
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)));
}
_ => (),
}
} else if let Event::RedrawRequested(_) = event {
fill::fill_window(&window);
}
})
}
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")
}