.TH TFMTODIT 1 "7 February 2022" "groff 1.22.4"
.SH NAME
tfmtodit \- create font files for use with groff \-Tdvi
.
.
.\" ====================================================================
.\" Legal Terms
.\" ====================================================================
.\"
.\" Copyright (C) 1989-2018 Free Software Foundation, Inc.
.\"
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.\" this manual under the conditions for verbatim copying, provided that
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.\" manual into another language, under the above conditions for
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.\" instead of in the original English.
.
.
.\" ====================================================================
.\" Definitions
.\" ====================================================================
.
.ie t .ds tx T\h'-.1667m'\v'.224m'E\v'-.224m'\h'-.125m'X
.el .ds tx TeX
.
.
.\" ====================================================================
.SH SYNOPSIS
.\" ====================================================================
.
.SY tfmtodit
.OP \-s
.OP \-g gf_file
.OP \-k skewchar
.I tfm_file
.I map_file
.I font
.YS
.
.SY tfmtodit
.B \-\-help
.YS
.
.SY tfmtodit
.B \-v
.SY tfmtodit
.B \-\-version
.YS
.
.
.\" ====================================================================
.SH DESCRIPTION
.\" ====================================================================
.
.B tfmtodit
creates a font file for use with
.B
groff \-Tdvi\fR.
.
.I tfm_file
is the name of the \*(tx font metric file for the font.
.
.I map_file
is a file giving the groff names for characters in the font;
this file should consist of a sequence of lines of the form:
.IP
.I
n c1 c2 \fR.\|.\|.
.
.
.LP
where
.I n
is a decimal integer giving the position of the character in the font,
and
.IR c1 ,
.IR c2 ,.\|.\|.
are the groff names of the character.
.
If a character has no groff names but exists in the tfm file,
then it will be put in the groff font file as an unnamed character.
.
.I font
is the name of the groff font file.
.
The groff font file is written to
.IR font .
.
.
.LP
The
.B \-s
option should be given if the font is special
(a font is
.I special
if
.B troff
should search it whenever
a character is not found in the current font.)
.
If the font is special,
it should be listed in the
.B fonts
command in the DESC file;
if it is not special, there is no need to list it, since
.B troff
can automatically mount it when it's first used.
.
.
.LP
To do a good job of math typesetting, groff requires font metric
information not present in the tfm file.
.
The reason for this is that \*(tx has separate math italic fonts
whereas groff uses normal italic fonts for math.
.
The additional information required by groff is given by the two
arguments to the
.B math_fit
macro in the Metafont programs for the Computer Modern fonts.
.
In a text font (a font for which
.B math_fitting
is false), Metafont normally ignores these two arguments.
.
Metafont can be made to put this information in the gf file by loading
the following definition after
.B cmbase
when creating
.IR cm.base :
.IP
.nf
.ft B
def ignore_math_fit(expr left_adjustment,right_adjustment) =
    special "adjustment";
    numspecial left_adjustment*16/designsize;
    numspecial right_adjustment*16/designsize;
    enddef;
.fi
.ft R
.LP
For the EC font family, load the following definition after
.B exbase
(it is probably easiest to patch
.I exbase.mf
locally):
.IP
.nf
.ft B
def ignore_math_fit(expr left_adjustment,right_adjustment) =
    ori_special "adjustment";
    ori_numspecial left_adjustment*16/designsize;
    ori_numspecial right_adjustment*16/designsize;
    enddef;
.fi
.ft R
.LP
The gf file created using this modified
.I cm.base
or
.I exbase
should be specified with the
.B \-g
option.
.
The
.B \-g
option should not be given for a font for which
.B math_fitting
is true.
.
.
.\" ====================================================================
.SH OPTIONS
.\" ====================================================================
.
Whitespace is permitted between a command-line option and its argument.
.
.
.TP
.B \-v
Print the version number.
.
.TP
.B \-s
The font is special.
.
The effect of this option is to add the
.B special
command to the font file.
.
.TP
.BI \-k n
The skewchar of this font is at position
.IR n .
.
.I n
should be an integer;
it may be given in decimal,
or with a leading
.B 0
in octal,
or with a leading
.B 0x
in hexadecimal.
.
The effect of this option is to ignore any kerns whose second
component is the specified character.
.
.TP
.BI \-g gf_file
.I gf_file
is a gf file produced by Metafont containing special and numspecial
commands giving additional font metric information.
.
.
.\" ====================================================================
.SH FILES
.\" ====================================================================
.
.TP
.I /usr/\:share/\:groff/\:1.22.4/\:font/devdvi/DESC
Device description file.
.
.TP
.IR /usr/\:share/\:groff/\:1.22.4/\:font/devdvi/ F
Font description file for font
.IR F .
.
.
.\" ====================================================================
.SH "SEE ALSO"
.\" ====================================================================
.BR groff (1),
.BR grodvi (1),
.BR groff_font (5)
.
.
.\" Local Variables:
.\" mode: nroff
.\" End:
.\" vim: set filetype=groff: