code: def _decode_region(decoder, region, corrections, shrink):
      
      with _decoded_matrix_region(decoder, region, corrections) as msg:
          if msg:
              # Coordinates
              p00 = DmtxVector2()
              p11 = DmtxVector2(1.0, 1.0)
              dmtxMatrix3VMultiplyBy(
                  p00,
                  region.contents.fit2raw
              )
              dmtxMatrix3VMultiplyBy(p11, region.contents.fit2raw)
              x0 = int((shrink * p00.X) + 0.5)
              y0 = int((shrink * p00.Y) + 0.5)
              x1 = int((shrink * p11.X) + 0.5)
              y1 = int((shrink * p11.Y) + 0.5)
              return Decoded(
                  string_at(msg.contents.output),
                  Rect(x0, y0, x1 - x0, y1 - y0)
              )
          else:
              return None
docs: Decodes and returns the value in a region.
  
      Args:
          region (DmtxRegion):
  
      Yields:
          Decoded or None: The decoded value.