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GROFF_FONT(5)							 GROFF_FONT(5)

NAME
       groff_font - format of groff device and font description files

DESCRIPTION
       The groff font format is roughly a superset of the ditroff font format.
       Unlike the ditroff font format, there is no associated  binary  format.
       The  font  files	 for  device  name  are stored in a directory devname.
       There are two types of file: a device description file called DESC  and
       for  each  font F a font file called F.	These are text files; there is
       no associated binary format.

   DESC file format
       The DESC file can contain the following types of line:

       res n  There are n machine units per inch.

       hor n  The horizontal resolution is n machine units.

       vert n The vertical resolution is n machine units.

       sizescale n
	      The scale factor for pointsizes.	By default this has a value of
	      1.   One scaled point is equal to one point/n.  The arguments to
	      the unitwidth and sizes commands are given in scaled points.

       unitwidth n
	      Quantities in the font files are	given  in  machine  units  for
	      fonts whose point size is n scaled points.

       prepro program
	      Call program as a preprocessor.

       postpro program
	      Use program as the postprocessor.

       tcommand
	      This  means that the postprocessor can handle the t and u output
	      commands.

       sizes s1 s2...sn 0
	      This means that the device has  fonts  at	 s1,  s2,...sn	scaled
	      points.	The  list of sizes must be terminated by a 0.  Each si
	      can also be a range of sizes m-n.	 The list can extend over more
	      than one line.

       styles S1 S2...Sm
	      The  first  m  font  positions  will  be	associated with styles
	      S1...Sm.

       fonts n F1 F2 F3...Fn
	      Fonts F1...Fn will be mounted in the font positions  m+1,...,m+n
	      where  m	is the number of styles.  This command may extend over
	      more than one line.  A font name of 0 will cause no font	to  be
	      mounted on the corresponding font position.

       family fam
	      The default font family is fam.

       use_charnames_in_special
	      This command indicates that troff should encode named characters
	      inside special commands.

       pass_filenames
	      requests that troff tells the driver the source file name	 being
	      processed.  This is achieved by another tcommand: F filename.

       charset
	      This  line and everything following in the file are ignored.  It
	      is allowed for the sake of backwards compatibility.

       print program
	      Use program as the spooler program for  printing.	  If  omitted,
	      the -l and -L options of groff are ignored.

       The  res,  unitwidth, fonts and sizes lines are compulsory.  Other com‐
       mands are ignored by troff but may be used by postprocessors  to	 store
       arbitrary information about the device in the DESC file.

       Here a list of obsolete keywords which are recognized by groff but com‐
       pletely ignored: spare1, spare2, biggestfont.

   Font file format
       A font file has two sections. The first section is a sequence of	 lines
       each  containing a sequence of blank delimited words; the first word in
       the line is a key, and subsequent words give a value for that key.

       name F The name of the font is F.

       spacewidth n
	      The normal width of a space is n.

       slant n
	      The characters of the font have a slant of n degrees.  (Positive
	      means forward.)

       ligatures lig1 lig2...lign [0]
	      Characters lig1, lig2,...,lign are ligatures; possible ligatures
	      are ff, fi, fl, ffi and ffl.  For backwards  compatibility,  the
	      list of ligatures may be terminated with a 0.  The list of liga‐
	      tures may not extend over more than one line.

       special
	      The font is  special;  this  means  that	when  a	 character  is
	      requested	 that  is  not present in the current font, it will be
	      searched for in any special fonts that are mounted.

       Other commands are ignored by troff but may be used  by	postprocessors
       to store arbitrary information about the font in the font file.

       The first section can contain comments which start with the # character
       and extend to the end of a line.

       The second section contains one or two subsections.  It must contain  a
       charset	subsection  and	 it  may  also contain a kernpairs subsection.
       These subsections can appear in any order.  Each subsection starts with
       a word on a line by itself.

       The  word  charset  starts the charset subsection.  The charset line is
       followed by a sequence of lines.	 Each line gives information  for  one
       character.   A line comprises a number of fields separated by blanks or
       tabs. The format is

	      name metrics type code [entity_name] [-- comment]

       name identifies the character: if name is a single character c then  it
       corresponds  to	the  groff  input character c; if it is of the form \c
       where c is a single character, then it corresponds to the  groff	 input
       character  \c;  otherwise  it  corresponds to the groff input character
       \[name] (if it is exactly two characters xx it can be entered as \(xx).
       Groff  supports eight bit characters; however some utilities has diffi‐
       culties with eight bit characters.  For this reason, there is a conven‐
       tion  that  the	name charn is equivalent to the single character whose
       code is n .  For example, char163 would be equivalent to the  character
       with  code  163	which is the pounds sterling sign in ISO Latin-1.  The
       name --- is special and indicates that the character is	unnamed;  such
       characters  can	only  be  used	by  means of the \N escape sequence in
       troff.

       The type field gives the character type:

       1      means the character has an descender, for example, p;

       2      means the character has an ascender, for example, b;

       3      means the character has both an ascender and  a  descender,  for
	      example, (.

       The code field gives the code which the postprocessor uses to print the
       character.  The character can also be input to groff using this code by
       means  of  the \N escape sequence.  The code can be any integer.	 If it
       starts with a 0 it will be interpreted as octal; if it starts  with  0x
       or 0X it will be intepreted as hexadecimal.

       The entity_name field gives an ascii string identifying the glyph which
       the postprocessor uses to print the character.  This field is  optional
       and  has	 been introduced so that the html device driver can encode its
       character set.  For example, the character `\[Po]'  is  represented  as
       `£' in html 4.0.

       Anything	 on the line after the encoding field resp. after `--' will be
       ignored.

       The metrics field has the form:

	      width[,height[,depth[,italic_correction[,left_italic_correc‐
	      tion[,subscript_correction]]]]]

       There  must  not	 be  any spaces between these subfields.  Missing sub‐
       fields are assumed to be 0.  The subfields are  all  decimal  integers.
       Since  there  is	 no  associated	 binary	 format,  these values are not
       required to fit into a variable of type char as they  are  in  ditroff.
       The  width subfields gives the width of the character.  The height sub‐
       field gives the height of the character (upwards	 is  positive);	 if  a
       character does not extend above the baseline, it should be given a zero
       height, rather than a negative height.  The depth  subfield  gives  the
       depth  of  the  character, that is, the distance below the lowest point
       below the baseline to which the character extends (downwards  is	 posi‐
       tive);  if  a  character	 does  not extend below above the baseline, it
       should be given a zero  depth,  rather  than  a	negative  depth.   The
       italic_correction  subfield  gives  the	amount of space that should be
       added after the character when it is immediately to be  followed	 by  a
       character from a roman font.  The left_italic_correction subfield gives
       the amount of space that should be added before the character  when  it
       is  immediately	to  be preceded by a character from a roman font.  The
       subscript_correction gives the amount of space  that  should  be	 added
       after  a character before adding a subscript.  This should be less than
       the italic correction.

       A line in the charset section can also have the format

	      name "

       This indicates that name is just another name for  the  character  men‐
       tioned in the preceding line.

       The  word  kernpairs  starts  the  kernpairs  section.  This contains a
       sequence of lines of the form:

	      c1 c2 n

       This means that when character c1 appears  next	to  character  c2  the
       space between them should be increased by n.  Most entries in kernpairs
       section will have a negative value for n.

FILES
       /freeware/gnu-tools/share/groff/1.17.2/font/devname/DESC
	      Device description file for device name.

       /freeware/gnu-tools/share/groff/1.17.2/font/devname/F
	      Font file for font F of device name.

SEE ALSO
       groff_out(5), gtroff(1).

Groff Version 1.17.2		 27 June 2001			 GROFF_FONT(5)
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