Abstract color.

gistfile1.hx

class Test
{
  static function main()
	{
		draw(0xFF);
		draw(function(x,y){ return 0xFF0000; });
		// draw(function(x,y){ return "foo"; }); // compile error, not color
	}

	static function draw(color:Color)
	{
		trace(color.getValue(0, 0));
	}
}

abstract Color(Int->Int->Int)
{
	public function new(f:Int -> Int -> Int)
		this = f;

	public inline function getValue(x:Int, y:Int)
		return Reflect.callMethod(null, this, [x,y]);

	@:from static public inline function fromInt(v:Int)
		return new Color(function(_,_){ return v; });

	@:from static public inline function fromFunc(v:Int->Int->Int)
		return new Color(v);
}