fix(VtkWindow): fix performances during image flip

- Remove array allocation during image flip

Author: Thibault-Pelletier

trame_rca/utils.py

@@ -139,7 +139,7 @@ def img_cols_rows(self):
         scalars = image_data.GetPointData().GetScalars()
         np_image = vtk_to_numpy(scalars)
         np_image = np_image.reshape((cols, rows, -1))
-        np_image = np_image[::-1, :, :]
+        np_image[:] = np_image[::-1, :, :]
         return np_image, cols, rows
 
     def process_resize_event(self, width, height):