#!/usr/bin/python
from PIL import Image
import sys
import os
import struct

"""Convert image to raw binary using Python Imaging Library."""

def split_seq(seq, splitsize):
  newseq = []
  while seq:
    newseq.append(seq[:splitsize])
    seq = seq[splitsize:]
  return newseq      

if __name__=="__main__":
  if len(sys.argv) < 3:
    print "Usage: %s <source> <target> [palette]" % os.path.split(sys.argv[0])[1]
    print "WARNING: It only converts 8bit images at the moment... and no tiling."
    sys.exit()

  im = Image.open(sys.argv[1])
  output = open(sys.argv[2], "wb")
  width, height = im.size
  for y in range(height):
    for x in range(width):
      val = im.getpixel((x, y)) 
      output.write(chr(val))

  if len(sys.argv) > 3:
    pal_output = open(sys.argv[3], "wb")
    for color in split_seq(im.palette.palette, 3):
      r, g, b = map(lambda col : col >> 3, map(ord, color))

      value = (b << 10) + (g << 5) + r
      pal_output.write(struct.pack("<h", value))