Runtime 2D Autotiling

Hi!

I am making a simple 2D runtime level editor and I want to make some kind of autotiling on my map tiles. But I have one problem. I have no idea how I would accomplish this. I have done a few google searches but most of the results are either in the editor, the old way of doing 2D stuff or simply in another code language. So any information on how I could do this would be to great help!

Thanks in advance!

An example of the kind of behaviour I am looking for

(Image source: http://www.saltgames.com/2010/a-bitwise-method-for-applying-tilemaps/) I would use that but I can't think of a way to implement it.