chickadee » leptonic » pix-get-pixel-avg

pix-get-pixel-avgprocedure
  • in - PPIX
  • in - PPIXM - (optional) 1bit mask of area to measure, may be #f
  • in - X Y - UL coords of mask relative to PPIX - ignored if PPIXM is #f
  • in - FACTOR - subsampling factor 1, 2, 4
  • out - PVAL: ptr to unsigned-int - avg pixel val
  • returns: 0 if “OK”, 1 on error.