System.Drawing.Graphics.FromCurrentContext C# (CSharp) Method

        public static Graphics FromCurrentContext()
        {
            return new Graphics ();
        }

        public static Graphics FromHwnd(IntPtr hwnd, bool client)
        {
            if (hwnd == IntPtr.Zero)
            {
                var scaleFactor = NSScreen.MainScreen.BackingScaleFactor;
                var context     = new CGBitmapContext(IntPtr.Zero, 1, 1, 8, 4, CGColorSpace.CreateDeviceRGB(), CGImageAlphaInfo.PremultipliedFirst);
                context.ScaleCTM(scaleFactor, -scaleFactor);
                return(new Graphics(context));
            }

            Graphics g;
            var      obj  = ObjCRuntime.Runtime.GetNSObject(hwnd);
            var      view = obj as NSView;

            if (view == null && obj is NSWindow && ((NSWindow)obj).GraphicsContext != null)
            {
                g = new Graphics(((NSWindow)obj).GraphicsContext);
            }
            else if (NSView.FocusView() == view)
            {
                if (NSGraphicsContext.CurrentContext == null)
                {
                    return(FromHwnd(IntPtr.Zero, false));
                }
                g = Graphics.FromCurrentContext();
            }
            else if (view.LockFocusIfCanDraw())
            {
                if (NSGraphicsContext.CurrentContext == null)
                {
                    return(FromHwnd(IntPtr.Zero, false));
                }
                g             = Graphics.FromCurrentContext();
                g.focusedView = view;
            }
            else if (view.Window != null && view.Window.GraphicsContext != null)
            {
                g = new Graphics(view.Window.GraphicsContext);
            }
            else
            {
                return(Graphics.FromImage(new Bitmap(1, 1)));
            }

            if (client)
            {
                if (view is IClientView clientView)
                {
                    var clientBounds = clientView.ClientBounds;
                    g.context.ClipToRect(clientBounds);
                    g.context.TranslateCTM(clientBounds.Left, clientBounds.Top);
                    g.context.SaveState();
                    g.hasClientTransform = true;
                }
            }

            return(g);
        }