Christopher Cave makes some magical things to make me read
} Would someone please point me in the direction of documentation
} on PIC files?
>From head to tail of file:
Word: width
Word: height
Word: number of row (special, more later)
Byte: mode
Byte: Spare (but might be set to 64 to force mode 33 on some _piq file
such as the colorful papa512_piq)
Mode can be 0 (for mode 4), 8 or any GD2 values (33 for Q40, 32 for QPC,
other mode might also exist, see GD2 documentation)
Then it is followed by row*height bytes.
Mode 8 and mode 4 are encoded as on the original QL.
GD2 mode are described in GD2 document (2 bytes for one pixel):
mode 33: Green 5 bit, Red 5 bit, Blue 5 bit, Intensity 1 bit
mode 32: Green top 3 bit, Blue 5 bit, Red 5 bit, Green 3 bit
(simpler in Intel Mode: Red 5, Green 6, Blue 5)
Beware of the alignment constraint for each line if you intended to
write some pic file.
Hope this help.
