PixArt file format

PixArt          *.PIX

1 long           file ID 'PIXT'
1 word           version, $0001 or $0002
1 byte           type, 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)
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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, format:
                   type = 0, xRRRRRGGGGGBBBBB
                   type = 1, RRRRRGGGGGGBBBBB (Falcon)
                   type = 2, GGGBBBBBxRRRRRGG (word swapped)
                 bit depth 24 is always chunky, format:
                   type = 0, BGR
                   type = 1, RGB
                 bit depth 32 is always chunky, format:
                   type = 0, ARGB

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