feat: load cursor from data

I want to add a function to load cursor from data

wayland-cursor/src/lib.rs

@@ -177,6 +177,48 @@ impl CursorTheme {
  }
  }
 
+ /// try to load data from theme, else, it will try to load from fallback data
+ pub fn get_cursor_with_default_data(&mut self, name: &str, data: &[u8]) -> Option<&Cursor> {
+ match self.cursors.iter().position(|cursor| cursor.name == name) {
+ Some(i) => Some(&self.cursors[i]),
+ None => {
+ let cursor = self.load_cursor_with_default_data(name, self.size, data)?;
+ self.cursors.push(cursor);
+ self.cursors.iter().last()
+ }
+ }
+ }
+
+ fn load_cursor_with_default_data(
+ &mut self,
+ name: &str,
+ size: u32,
+ data: &[u8],
+ ) -> Option<Cursor> {
+ let conn = Connection::from_backend(self.backend.upgrade()?);
+ 'fallback: {
+ let Some(icon_path) = XCursorTheme::load(&self.name).load_icon(name) else {
+ break 'fallback;
+ };
+ let Ok(mut icon_file) = File::open(icon_path) else {
+ break 'fallback;
+ };
+ let mut buf = Vec::new();
+ let Some(images) = ({
+ if icon_file.read_to_end(&mut buf).is_err() {
+ break 'fallback;
+ }
+ xparser::parse_xcursor(&buf)
+ }) else {
+ break 'fallback;
+ };
+
+ return Some(Cursor::new(&conn, name, self, &images, size));
+ }
+ let images = xparser::parse_xcursor(data)?;
+ Some(Cursor::new(&conn, name, self, &images, size))
+ }
+
  /// This function loads a cursor, parses it and pushes the images onto the shm pool.
  ///
  /// Keep in mind that if the cursor is already loaded, the function will make a duplicate.