Generate from a pre-defined output image

Hi,

I'm trying to implement a way to give the algorithm a pre-defined output image containing fixed (already put in place) tiles (in overlap mode).

I do not understand the code very well but I have some ideas.

So on this line the output image is created: https://github.com/mxgmn/WaveFunctionCollapse/blob/a6f79f0f1a4220406220782b71d3fcc73a24a4c2/OverlappingModel.cs#L116 Is it possible to fill the observed array with our pre-defined image (before running the algorithm)? What does the array observed do? Another option would be to put it in inside the init or observer function.

EDIT:

My use-case is specifying an output image where the border is filled with "water" so that you can guarantee that the algorithm always generates "islands". Same goes with "rooms".