feat: add cache and gtk benches comparison

src/cache.rs

@@ -0,0 +1,35 @@
+use once_cell::sync::Lazy;
+use std::collections::BTreeMap;
+use std::path::PathBuf;
+use std::sync::Mutex;
+
+pub(crate) static CACHE: Lazy<Cache> = Lazy::new(Cache::default);
+
+#[derive(Default)]
+pub(crate) struct Cache(Mutex<BTreeMap<String, BTreeMap<(String, u16, u16), PathBuf>>>);
+
+impl Cache {
+    pub fn insert(&self, theme: &str, size: u16, scale: u16, icon_name: &str, icon_path: &PathBuf) {
+        let mut theme_map = self.0.lock().unwrap();
+
+        match theme_map.get_mut(theme) {
+            Some(icon_map) => {
+                icon_map.insert((icon_name.to_string(), size, scale), icon_path.clone());
+            }
+            None => {
+                let mut icon_map = BTreeMap::new();
+                icon_map.insert((icon_name.to_string(), size, scale), icon_path.clone());
+                theme_map.insert(theme.to_string(), icon_map);
+            }
+        }
+    }
+
+    pub fn get(&self, theme: &str, size: u16, scale: u16, icon_name: &str) -> Option<PathBuf> {
+        let theme_map = self.0.lock().unwrap();
+
+        theme_map
+            .get(theme)
+            .map(|icon_map| icon_map.get(&(icon_name.to_string(), size, scale)))
+            .and_then(|path| path.cloned())
+    }
+}