Update face_swapper.py

Update:
- Support the opacity of the face swap in the UI

modules/processors/frame/face_swapper.py

@@ -21,10 +21,7 @@ THREAD_LOCK = threading.Lock()
 NAME = "DLC.FACE-SWAPPER"
 
 abs_dir = os.path.dirname(os.path.abspath(__file__))
-models_dir = os.path.join(
-    os.path.dirname(os.path.dirname(os.path.dirname(abs_dir))), "models"
-)
-
+models_dir = os.path.join(os.path.dirname(os.path.dirname(os.path.dirname(abs_dir))), 'models')
 
 def pre_check() -> bool:
     download_directory_path = abs_dir
@@ -59,7 +56,7 @@ def get_face_swapper() -> Any:
 
     with THREAD_LOCK:
         if FACE_SWAPPER is None:
-            model_path = os.path.join(models_dir, "inswapper_128_fp16.onnx")
+            model_path = os.path.join(models_dir, 'inswapper_128_fp16.onnx')
             FACE_SWAPPER = insightface.model_zoo.get_model(
                 model_path, providers=modules.globals.execution_providers
             )
@@ -93,6 +90,9 @@ def swap_face(source_face: Face, target_face: Face, temp_frame: Frame) -> Frame:
             swapped_frame = draw_mouth_mask_visualization(
                 swapped_frame, target_face, mouth_mask_data
             )
+    opacity = getattr(modules.globals, "opacity", 1.0)
+    swapped_frame = cv2.addWeighted(temp_frame, 1 - opacity, swapped_frame, opacity, 0)
+
 
     return swapped_frame