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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 previous 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.
image_generator string
Needed for grohtml only. It specifies the program to generate PNG images from PostScript
input. Under GNU/Linux this is usually gs but under other systems (notably cygwin) it might
be set to another name.
paperlength n
The physical vertical dimension of the output medium in machine units. This isn't used by
troff itself but by output devices. Deprecated. Use papersize instead.
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. Alterna-tively, Alternatively,
tively, 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.
paperwidth n
The physical horizontal dimension of the output medium in machine units. Deprecated. Use
papersize instead. This isn't used by troff itself but by output devices.
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
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 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.
unscaled_charwidths
Make the font handling module always return unscaled character widths. Needed for the grohtml
device.
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. Not all commands in the DESC file are
used by troff itself; some of the keywords (or even additional ones) are used by postprocessors to
store arbitrary information about the device.
Here a list of obsolete keywords which are recognized by groff but completely 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 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 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 spe-cial special
cial 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 charac-ters. characters.
ters. For this reason, there is a convention that the name charn is equivalent to the single charac-ter character
ter 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 inte-ger. integer.
ger. 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 inte-ger. integer.
ger.
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 (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 character 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 leftitalic-correction
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/1.19.2/font/devname/DESC Device description file for device name.
/usr/share/groff/1.19.2/font/devname/F Font file for font F of device name.
SEE ALSO
groff_out(5), troff(1).
Groff Version 1.19.2 8 October 2004 GROFF_FONT(5)
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