anchor: ImageData:paste
  Paste into ImageData from another source ImageData.
  ImageData:paste( source, dx, dy, sx, sy, sw, sh )
  source ImageData Source ImageData from which to copy.
  dx number Destination top-left position on x-axis.
  dy number Destination top-left position on y-axis.
  sx number Source top-left position on x-axis.
  sy number Source top-left position on y-axis.
  sw number Source width.
  sh number Source height.