UnityEditor.GameView.GetSizeOfMainGameView C# (CSharp) Method

        internal static Vector2 GetSizeOfMainGameView()
        {
            return GetMainGameViewTargetSize();
        }

 public void OnOverlayGUI(Object target, SceneView sceneView)
 {
     if (target != null)
     {
         Camera  other = (Camera)target;
         Vector2 sizeOfMainGameView = GameView.GetSizeOfMainGameView();
         if (sizeOfMainGameView.x < 0f)
         {
             sizeOfMainGameView.x = sceneView.position.width;
             sizeOfMainGameView.y = sceneView.position.height;
         }
         Rect rect = other.rect;
         sizeOfMainGameView.x *= Mathf.Max(rect.width, 0f);
         sizeOfMainGameView.y *= Mathf.Max(rect.height, 0f);
         if ((sizeOfMainGameView.x > 0f) && (sizeOfMainGameView.y > 0f))
         {
             float num = sizeOfMainGameView.x / sizeOfMainGameView.y;
             sizeOfMainGameView.y = 0.2f * sceneView.position.height;
             sizeOfMainGameView.x = sizeOfMainGameView.y * num;
             if (sizeOfMainGameView.y > (sceneView.position.height * 0.5f))
             {
                 sizeOfMainGameView.y = sceneView.position.height * 0.5f;
                 sizeOfMainGameView.x = sizeOfMainGameView.y * num;
             }
             if (sizeOfMainGameView.x > (sceneView.position.width * 0.5f))
             {
                 sizeOfMainGameView.x = sceneView.position.width * 0.5f;
                 sizeOfMainGameView.y = sizeOfMainGameView.x / num;
             }
             Rect rect2 = EditorGUIUtility.PointsToPixels(GUILayoutUtility.GetRect(sizeOfMainGameView.x, sizeOfMainGameView.y));
             rect2.y = (((sceneView.position.height + 1f) * EditorGUIUtility.pixelsPerPoint) - rect2.y) - rect2.height;
             if (Event.current.type == EventType.Repaint)
             {
                 this.previewCamera.CopyFrom(other);
                 Skybox component = this.previewCamera.GetComponent <Skybox>();
                 if (component != null)
                 {
                     Skybox skybox2 = other.GetComponent <Skybox>();
                     if ((skybox2 != null) && skybox2.enabled)
                     {
                         component.enabled  = true;
                         component.material = skybox2.material;
                     }
                     else
                     {
                         component.enabled = false;
                     }
                 }
                 this.previewCamera.targetTexture = null;
                 this.previewCamera.pixelRect     = rect2;
                 Handles.EmitGUIGeometryForCamera(other, this.previewCamera);
                 this.previewCamera.Render();
             }
         }
     }
 }