gdk-sharp2.10.0.0Gtk# is thread aware, but not thread safe; See the Gtk# Thread Programming for details.Determines how bit values for the source pixels are combine with the bit values for destination pixels to produce the final result.The sixteen values here correspond to the 16 different possible 2x2 truth tables. Only a couple of these values are usually useful; for colored images, only Copy, Xor and Invert are generally useful. For bitmaps, And and Or are also useful.System.EnumGLib.GType(typeof(Gdk.FunctionGType))FieldGdk.FunctionCopyFieldGdk.FunctionInvertFieldGdk.FunctionXorFieldGdk.FunctionClearFieldGdk.FunctionAndFieldGdk.FunctionAnd ReverseFieldGdk.FunctionAnd InvertFieldGdk.FunctionNo opFieldGdk.FunctionOrFieldGdk.FunctionEquivFieldGdk.FunctionOr ReverseFieldGdk.FunctionCopy InvertFieldGdk.FunctionOr InvertFieldGdk.FunctionN AndFieldGdk.FunctionNorFieldGdk.FunctionSet