System.Windows.Forms.XplatUIX11.GetReversibleScreenGC C# (CSharp) Method

		IntPtr GetReversibleScreenGC (Color backColor)
		{
			XGCValues	gc_values;
			IntPtr		gc;
			uint pixel;

			XColor xcolor = new XColor();
			xcolor.red = (ushort)(backColor.R * 257);
			xcolor.green = (ushort)(backColor.G * 257);
			xcolor.blue = (ushort)(backColor.B * 257);
			XAllocColor(DisplayHandle, DefaultColormap, ref xcolor);
			pixel = (uint)xcolor.pixel.ToInt32();


			gc_values = new XGCValues();

			gc_values.subwindow_mode = GCSubwindowMode.IncludeInferiors;
			gc_values.foreground = (IntPtr)pixel;

			gc = XCreateGC(DisplayHandle, RootWindow, new IntPtr ((int) (GCFunction.GCSubwindowMode | GCFunction.GCForeground)), ref gc_values);
			XSetForeground(DisplayHandle, gc, (UIntPtr)pixel);
			XSetFunction(DisplayHandle,   gc, GXFunction.GXxor);

			return gc;
		}