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NAME

       uniunmask - XOR bits or substitute glyphs in a GNU Unifont file.

SYNOPSIS

       uniunmask [-iinput_file] [-ooutput_file]

DESCRIPTION

       uniunmask reads a GNU Unifont .hex file.  As it reads the font file, it
       scans  for  code  points  matching  entries  in  the  "masks.hex"   and
       "substitutes.hex" files.  "masks.hex" and "substitutes.hex" are also in
       GNU Unifont .hex format, ordered by Unicode code point (the hexadecimal
       number to the left of the colon on each line).

       If  a  code point is encountered from "substitutes.hex", the input code
       point in the original .hex file is ignored (as is any  entry  with  the
       same code point in "masks.hex") and the glyph from "substitutes.hex" is
       written to the output file.

       Otherwise, if a code point is encountered from "masks.hex",  the  input
       glyph  in  the  original  .hex  file  is  XORed  with  the  bits in the
       "masks.hex" entry.  The result of this XOR operation is written to  the
       output file.

OPTIONS

       -i          Specify the input file. The default is stdin.

       -o          Specify the output file. The default is stdout.

FILES

       masks.hex, substitutes.hex, *.hex GNU Unifont font files

SEE ALSO

       bdfimplode(1), hex2bdf(1), hex2bdf-split(1), hex2sfd(1), hexbraille(1),
       hexdraw(1), hexmerge(1), johab2ucs2(1), unibmp2hex(1),  unicoverage(1),
       unidup(1), unihex2bmp(1), unipagecount(1)

AUTHOR

       uniunmask was written by Paul Hardy.

LICENSE

       uniunmask is Copyright © 2007 Paul Hardy, and is released under version
       2 of the GNU General Public  License,  or  (at  your  option)  a  later
       version.

BUGS

       No  known  real  bugs exist, except that this software does not perform
       extensive error checking on its input files.  If  they’re  not  in  the
       format of the original GNU Unifont hex file, all bets are off.

                                  2008 Jul 6