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GROFF_FONT(@MAN5EXT@)					 GROFF_FONT(@MAN5EXT@)

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.

       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.

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

       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.

   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 and ffl.  For backwards compatibiliy, the list of
	      ligatures may be terminated with a 0.  The list of ligatures 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 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 hexdecimal.

       Anything on the line after the code field 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
       @FONTDIR@/devname/DESC	Device description file for device name.

       @FONTDIR@/devname/F	Font file for font F of device name.

SEE ALSO
       groff_out(@MAN5EXT@), @g@troff(@MAN1EXT@).

Groff Version @VERSION@		    @MDATE@		 GROFF_FONT(@MAN5EXT@)
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