Best way to get game window size

I want to get the updated size of the current game window to do some calculations for PixelPerfectCamera, but for some reason

Screen.width

and

Screen.height

are not updated (always show the windows size from when the game was started).

I found the member

Display.main.renderingHeight

which seems to work, but I don't know how efficient it is (I'm calling it every update to check if the game window size has changed) or if it's a good idea to use it

Here is a snippet to show what I'm trying to do

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEditor;
5.  
6. public class Camera : MonoBehaviour {
7.     UnityEngine.Experimental.Rendering.Universal.PixelPerfectCamera pixelComponent;
8.     UnityEngine.Camera camera;
9.     private Resolution resolution;
10.  
11.     private bool isWindowResized {get {
12.         Resolution newResolution = new Resolution();
13.         var display = Display.main;
14.         newResolution.height = display.renderingHeight;
15.         newResolution.width = display.renderingWidth;
16.         bool changed = resolution.width != newResolution.width || resolution.height != newResolution.height;
17.         resolution = newResolution;
18.         return changed;
19.     }}
20.  
21.     private void updateResolution() {
22.         void updateRes(int width, bool crop) {
23.             pixelComponent.refResolutionX = width;
24.             pixelComponent.cropFrameX = crop;
25.         }
26.      
27.         if (isWindowResized) {
28.             pixelComponent.refResolutionY = 180;
29.             var bestFittingHeight = 180*(int)(resolution.height/180);
30.             float aspectRatio = ((float)resolution.width)/bestFittingHeight;
31.             //TODO add a 'maximum aspect ratio' game option
32.             if (aspectRatio >= 16f/9) updateRes(320, true); //16:9
33.             else if (aspectRatio >= 16f/10) updateRes(288, false); //16:10
34.             else if (aspectRatio >= 3f/2) updateRes(270, false); //3:2
35.             else updateRes(240, false); //4:3
36.         }
37.     }
38.  
39.     // Start is called before the first frame update
40.     void Start() {
41.         camera = gameObject.GetComponent<UnityEngine.Camera>();
42.         pixelComponent = gameObject.GetComponent<UnityEngine.Experimental.Rendering.Universal.PixelPerfectCamera>();
43.     }
44.  
45.     // Update is called once per frame
46.     void Update() {
47.         updateResolution();
48.     }
49. }
50.