refactor: extract draw_stats function

app.py

@@ -20,6 +20,24 @@ PORT = int(os.environ.get("PORT", 5000))
 
 sessions: dict[str, Session] = {}
 
+def draw_stats(frame: MatLike, session: Session):
+    font = cv2.FONT_HERSHEY_SIMPLEX
+    font_scale = 1
+    thickness = 2
+    color = (0, 255, 0)
+    text = f"""
+    ID: {session.id}
+    FPS: {session.measured_fps:.0f}
+    CPU: {session.cpu_usage:02.0f}%
+    """
+
+    y0, dy = 30, 36
+    for i, line in enumerate(text.split('\n')):
+        (text_width, text_height), _ = cv2.getTextSize(line, font, font_scale, thickness)
+        x = frame.shape[1] - text_width - 10
+        y = y0 + (i - 1) * dy
+        cv2.putText(frame, line, (x, y), font, font_scale, color, thickness, cv2.LINE_AA)
+
 def process_frame(session_id: str):
     global sessions
 
@@ -59,22 +77,7 @@ def process_frame(session_id: str):
                     continue
                 else:
                     if session.show_stats:
-                        font = cv2.FONT_HERSHEY_SIMPLEX
-                        font_scale = 1
-                        thickness = 2
-                        color = (0, 255, 0)
-                        text = f"""
-                        ID: {session_id}
-                        FPS: {session.measured_fps:.0f}
-                        CPU: {session.cpu_usage:02.0f}%
-                        """
-
-                        y0, dy = 30, 36
-                        for i, line in enumerate(text.split('\n')):
-                            (text_width, text_height), _ = cv2.getTextSize(line, font, font_scale, thickness)
-                            x = frame.shape[1] - text_width - 10
-                            y = y0 + (i - 1) * dy
-                            cv2.putText(frame, line, (x, y), font, font_scale, color, thickness, cv2.LINE_AA)
+                        draw_stats(frame, session)
                 session.latest_frame = frame
 
                 next_frame_time += frame_duration