refactor: use OnceLock for log dedup statics in processor.rs

src/plugins/video/processor.rs

@@ -13,28 +13,26 @@ use opencv::{
 };
 use rand::Rng;
 use std::collections::HashSet;
-use std::sync::{Arc, Mutex, MutexGuard};
+use std::sync::{Arc, Mutex, MutexGuard, OnceLock};
 use std::time::Instant;
 
 type WindowRectKey = (String, i32, i32, i32, i32);
 type LoggedSizes = ((i32, i32), (i32, i32), (i32, i32));
 
 fn log_mat_size(label: &str, frame: &Mat) {
-    use std::sync::Mutex;
-
-    static SEEN: Mutex<Option<HashSet<(String, i32, i32)>>> = Mutex::new(None);
+    static SEEN: OnceLock<Mutex<HashSet<(String, i32, i32)>>> = OnceLock::new();
     let key = (label.to_string(), frame.cols(), frame.rows());
-    let mut guard = SEEN.lock().unwrap();
-    let set = guard.get_or_insert_with(HashSet::new);
-    if set.insert(key) {
+    let mut guard = SEEN
+        .get_or_init(|| Mutex::new(HashSet::new()))
+        .lock()
+        .unwrap();
+    if guard.insert(key) {
         println!("{}: cols={} rows={}", label, frame.cols(), frame.rows());
     }
 }
 
 fn log_window_image_rect(window_name: &str) {
-    use std::sync::Mutex;
-
-    static SEEN: Mutex<Option<HashSet<WindowRectKey>>> = Mutex::new(None);
+    static SEEN: OnceLock<Mutex<HashSet<WindowRectKey>>> = OnceLock::new();
     match highgui::get_window_image_rect(window_name) {
         Ok(rect) => {
             let key = (
@@ -44,9 +42,11 @@ fn log_window_image_rect(window_name: &str) {
                 rect.width,
                 rect.height,
             );
-            let mut guard = SEEN.lock().unwrap();
-            let set = guard.get_or_insert_with(HashSet::new);
-            if set.insert(key) {
+            let mut guard = SEEN
+                .get_or_init(|| Mutex::new(HashSet::new()))
+                .lock()
+                .unwrap();
+            if guard.insert(key) {
                 println!(
                     "window.image_rect {}: x={} y={} width={} height={}",
                     window_name, rect.x, rect.y, rect.width, rect.height,