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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.  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  pre-
       vious values.

       charset
              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 predefined 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 vertical 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.

       pass_filenames
              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 s2...sn 0
              This  means  that  the device has fonts at s1, s2,...sn scaled points.  The list of sizes must be termi-
              nated 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 S1...Sm.

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

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

       use_charnames_in_special
              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 commands 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 completely ignored: spare1, spare2, biggest-
       font.

   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 ligatures 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.

       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  con-
       tain 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 character \[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 difficulties with eight-bit characters.  For
       this reason, there is a convention 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  char-
       acter 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 (in one line; it is broken here for the sake of readability):

              width[,height[,depth[,italic-correction
              [,left-italic-correction[,subscript-correction]]]]]

       There  must  not  be any spaces between these subfields.  Missing subfields 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 subfield 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  char-
       acter  extends  (downwards  is positive); 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 mentioned 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
       /usr/share/groff/1.18.1.4/font/devname/DESC   Device description file for device name.

       /usr/share/groff/1.18.1.4/font/devname/F      Font file for font F of device name.

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



Groff Version 1.18.1.4         12 September 2002                 GROFF_FONT(5)