groff_font man page on OpenDarwin

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       groff_font - format of groff device and font description files

       The groff font format is roughly a superset of the ditroff font 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; unlike the
       ditroff font format, there is no associated binary format.

   DESC file format
       The  DESC  file can contain the following types of line as shown below.
       Later entries in the file override previous values.

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

       family fam
	      The default font family is fam.

       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.

       hor n  The horizontal resolution is n machine units.

       paperheight n
	      The physical vertical dimension of the output medium in  machine
	      units.   This  isn't used by troff itself; currently, only grops
	      uses it.

       paperwidth n
	      The physical  horizontal	dimension  of  the  output  medium  in
	      machine  units.	This isn't used by troff.  Currently, only the
	      grolbp output device uses it.

       papersize string
	      Select a paper size.  Valid values for string are the ISO	 paper
	      types  A0-A7,  B0-B7,  C0-C7,  D0-D7, DL, and the US paper types
	      letter, legal, tabloid, ledger, statement, executive, com10, and
	      monarch.	 Case is not significant for string if it holds prede‐
	      fined paper types.  Alternatively, string can  be	 a  file  name
	      (e.g.  `/etc/papersize'); if the file can be opened, groff reads
	      the first line and tests for the above  paper  sizes.   Finally,
	      string can be a custom paper size in the format length,width (no
	      spaces before and after the comma).  Both length and width  must
	      have  a  unit appended; valid values are `i' for inches, `c' for
	      centimeters, `p'	for  points,  and  `P'	for  picas.   Example:
	      12c,235p.	  An  argument	which  starts  with  a digit is always
	      treated as a custom paper format.	 papersize sets both the  ver‐
	      tical and horizontal dimension of the output medium.

	      More  than  one argument can be specified; groff scans from left
	      to right and uses the first valid paper specification.

	      Make troff tell the driver the source file name being processed.
	      This is achieved by another tcommand: F filename.

       postpro program
	      Use program as the postprocessor.

       prepro program
	      Call program as a preprocessor.

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

       res n  There are n machine units per inch.

       sizes s1 0
	      This means that the device has  fonts  at	 s1,  s2,	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.

       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.

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

	      This means that the postprocessor can handle the t and u	output

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

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

       vert n The vertical resolution is n machine units.

       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.

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

       name F The name of the font is F.

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

       spacewidth n
	      The normal width of a space is n.

	      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 special char‐
       acter  \[c];  otherwise	it  corresponds	 to  the groff input character
       \[name].	 If it is exactly two characters xx it can be entered as \(xx.
       Note that single-letter special characters can't be accessed as \c; the
       only exception is `\-' which is identical to `\[-]'.  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.

       Groff supports eight-bit characters; however some utilities have 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 type field gives the character type:

       1      means the character has a 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.  Note, however, that the \N
       escape sequence only accepts a decimal integer.

       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

       The  metrics field has the form (in one line; it is broken here for the
       sake of readability):


       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.

	      Device description file for device name.

	      Font file for font F of device name.

       groff_out(5), troff(1).

Groff Version 1.18.1		   Nov	2003			 GROFF_FONT(5)

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