Schemes (p.oxbow.0.1.1.doc.oxbow.layout.Oxbow

val compute : 
  params:Params.Tiling.t ->
  usable_area:int Oxbow_core.Rect.canonical ->
  count:int ->
  int Oxbow_core.Rect.canonical list

compute ~params ~usable_area ~count is one rectangle per window for the scheme in params.