PixArt file format

PixArt          *.PIX

   1 long       file ID 'PIXT'
   1 word       version, $0001 or $0002
   1 byte       chunky (0) or planar (1)
   1 byte       #bitplanes
   1 word       xres (always a multiple of 16)
   1 word       yres
   1 word       unknown
   1 word       unknown (version $0002 only)
---------
14 or 16 bytes  total for header

 3*n bytes      palette, only for bit depths 2, 4, 8.
???? bytes      image data, chunky or planar for bit depths 2, 4, 8
                bit depth 16 is always chunky, Falcon RGB format (RRRRRGGGGGGBBBBB)

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