private static System.Tuple <int, int, int> OSGetPrimaryDisplayInfo()
{
var mainScreen = NSScreen.MainScreen;
var width = System.Convert.ToInt32(mainScreen.Frame.Width);
var height = System.Convert.ToInt32(mainScreen.Frame.Height);
var depth = (int)NSGraphics.BitsPerPixelFromDepth(mainScreen.Depth);
return(new System.Tuple <int, int, int>(width, height, depth));
}