refactored window storage;

new helper window events (Destroyed, Created);
clippy + fmt;

src/window/icon.rs

@@ -0,0 +1,63 @@
+//! Attach an icon to the window of your application.
+pub use crate::core::window::icon::*;
+
+use crate::core::window::icon;
+
+use std::io;
+
+#[cfg(feature = "image")]
+use std::path::Path;
+
+/// Creates an icon from an image file.
+///
+/// This will return an error in case the file is missing at run-time. You may prefer [`Self::from_file_data`] instead.
+#[cfg(feature = "image")]
+pub fn from_file<P: AsRef<Path>>(icon_path: P) -> Result<Icon, Error> {
+    let icon = image_rs::io::Reader::open(icon_path)?.decode()?.to_rgba8();
+
+    Ok(icon::from_rgba(icon.to_vec(), icon.width(), icon.height())?)
+}
+
+/// Creates an icon from the content of an image file.
+///
+/// This content can be included in your application at compile-time, e.g. using the `include_bytes!` macro.
+/// You can pass an explicit file format. Otherwise, the file format will be guessed at runtime.
+#[cfg(feature = "image")]
+pub fn from_file_data(
+    data: &[u8],
+    explicit_format: Option<image_rs::ImageFormat>,
+) -> Result<Icon, Error> {
+    let mut icon = image_rs::io::Reader::new(std::io::Cursor::new(data));
+    let icon_with_format = match explicit_format {
+        Some(format) => {
+            icon.set_format(format);
+            icon
+        }
+        None => icon.with_guessed_format()?,
+    };
+
+    let pixels = icon_with_format.decode()?.to_rgba8();
+
+    Ok(icon::from_rgba(
+        pixels.to_vec(),
+        pixels.width(),
+        pixels.height(),
+    )?)
+}
+
+/// An error produced when creating an [`Icon`].
+#[derive(Debug, thiserror::Error)]
+pub enum Error {
+    /// The [`Icon`] is not valid.
+    #[error("The icon is invalid: {0}")]
+    InvalidError(#[from] icon::Error),
+
+    /// The underlying OS failed to create the icon.
+    #[error("The underlying OS failted to create the window icon: {0}")]
+    OsError(#[from] io::Error),
+
+    /// The `image` crate reported an error.
+    #[cfg(feature = "image")]
+    #[error("Unable to create icon from a file: {0}")]
+    ImageError(#[from] image_rs::error::ImageError),
+}