Deformations using Green Coordinates

I just found this paper on Gimp news and thought it might be interesting, mostly for the posing part. Maybe you (or Blender) are already implementing this, but just in case.
http://www.math.tau.ac.il/~lipmanya/GC/gc_techrep.pdf
http://www.math.tau.ac.il/~lipmanya/GC/gc_techrep.pdf