.TH tfmtodit 1 "16 October 2023" "groff 1.23.0"
.SH Name
tfmtodit \- adapt TeX Font Metrics files for use with
.I groff
and
.I grodvi
.
.
.\" ====================================================================
.\" Legal Terms
.\" ====================================================================
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.\" included in translations approved by the Free Software Foundation
.\" instead of in the original English.
.
.
.\" Save and disable compatibility mode (for, e.g., Solaris 10/11).
.do nr *groff_tfmtodit_1_man_C \n[.cp]
.cp 0
.
.\" Define fallback for groff 1.23's MR macro if the system lacks it.
.nr do-fallback 0
.if !\n(.f           .nr do-fallback 1 \" mandoc
.if  \n(.g .if !d MR .nr do-fallback 1 \" older groff
.if !\n(.g           .nr do-fallback 1 \" non-groff *roff
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.\" ====================================================================
.\" Definitions
.\" ====================================================================
.
.ie t .ds tx T\h'-.1667m'\v'.224m'E\v'-.224m'\h'-.125m'X
.el .ds tx TeX
.
.
.\" ====================================================================
.SH Synopsis
.\" ====================================================================
.
.SY tfmtodit
.RB [ \-s ]
.RB [ \-g\~\c
.IR gf-file ]
.RB [ \-k\~\c
.IR skew-char ]
.I tfm-file
.I map-file
.I font-description
.YS
.
.
.SY tfmtodit
.B \-\-help
.YS
.
.
.SY tfmtodit
.B \-v
.
.SY tfmtodit
.B \-\-version
.YS
.
.
.\" ====================================================================
.SH Description
.\" ====================================================================
.
.I tfmtodit
creates a font description file for use with
.MR groff 1 's
.B dvi
output device.
.
.I tfm-file
is the name of the \*(tx font metric file for the font.
.
.I map-file
assigns
.I groff
ordinary or special character identifiers to glyph indices in the font;
it should consist of a sequence of lines of the form
.
.RS
.IR "i c1" \~\&.\|.\|.\&\~ cn
.RE
.
where
.I i
is a position of the glyph in the font in decimal,
and
.I c1
through
.I cn
are glyph identifiers in the form used by
.I groff
font descriptions.
.
If a glyph has no
.I groff
names but exists in
.I tfm-file,
it is put in the
.I groff
font description file as an unnamed glyph.
.
Output is written in
.MR groff_font 5
format to
.I font-description,
a file named for the intended
.I groff
font name.
.
.
.P
If the font is \[lq]special\[rq],
meaning that
.I groff
should search it whenever a glyph is not found in the current font,
use the
.B \-s
option and name
.I font-description
in the
.B fonts
directive in the output device's
.I DESC
file.
.
.
.P
To do a good job of math typesetting,
.I groff
requires font metric information not present in
.I tfm-file.
.
This is because \*(tx has separate math italic fonts,
whereas
.I groff
uses normal italic fonts for math.
.
The additional information required by
.I 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_fit
is false),
Metafont normally ignores these two arguments.
.
Metafont can be made to put this information into the GF
(\[lq]generic font\[rq])
files it produces by loading the following definition after
.B cmbase
when creating
.IR cm.base .
.
.RS
.EX
def ignore_math_fit(expr left_adjustment,right_adjustment) =
    special "adjustment";
    numspecial left_adjustment*16/designsize;
    numspecial right_adjustment*16/designsize;
    enddef;
.EE
.RE
.
For the EC font family,
load the following definition after
.BR exbase ;
consider patching
.I exbase.mf
locally.
.
.RS
.EX
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;
.EE
.RE
.
The only difference from the previous example is the \[lq]ori_\[rq]
prefix to \[lq]special\[rq] and \[lq]numspecial\[rq].
.
The GF file created using this modified
.I cm.base
or
.I exbase.mf
should be specified with the
.B \-g
option,
which should
.I not
be given for a font for which
.B math_fit
is true.
.
.
.\" ====================================================================
.SH Options
.\" ====================================================================
.
.B \-\-help
displays a usage message,
while
.B \-v
and
.B \-\-version
show version information;
all exit afterward.
.
.
.TP
.BI \-g \~gf-file
Use the
.I gf-file
produced by Metafont containing
.RB \[lq] special \[rq]
and
.RB \[lq] numspecial \[rq]
commands to obtain additional font metric information.
.
.
.TP
.BI \-k \~skew-char
The skew character of this font is at position
.I skew-char.
.
.I skew-char
should be an integer;
it may be given in decimal,
with a leading 0 in octal,
or with a leading 0x in hexadecimal.
.
Any kerns whose second component is
.I skew-char
are ignored.
.
.
.TP
.B \-s
Add the
.B special
directive to the font description file.
.
.
.\" ====================================================================
.SH Files
.\" ====================================================================
.
.TP
.I /usr/\:\%share/\:\%groff/\:\%1.23.0/\:\%font/\:\%devdvi/\:DESC
describes the
.B dvi
output device.
.
.
.TP
.IR /usr/\:\%share/\:\%groff/\:\%1.23.0/\:\%font/\:\%devdvi/ F
describes the font known
.RI as\~ F
on device
.BR dvi .
.
.
.TP
.I /usr/\:\%share/\:\%groff/\:\%1.23.0/\:\%font/\:\%devdvi/\:\%generate/\:\%ec.map
.TQ
.I /usr/\:\%share/\:\%groff/\:\%1.23.0/\:\%font/\:\%devdvi/\:\%generate/\:\%msam.map
.TQ
.I /usr/\:\%share/\:\%groff/\:\%1.23.0/\:\%font/\:\%devdvi/\:\%generate/\:\%msbm.map
.TQ
.I /usr/\:\%share/\:\%groff/\:\%1.23.0/\:\%font/\:\%devdvi/\:\%generate/\:\%tc.map
.TQ
.I /usr/\:\%share/\:\%groff/\:\%1.23.0/\:\%font/\:\%devdvi/\:\%generate/\:\%texb.map
.TQ
.I /usr/\:\%share/\:\%groff/\:\%1.23.0/\:\%font/\:\%devdvi/\:\%generate/\:\%texex.map
.TQ
.I /usr/\:\%share/\:\%groff/\:\%1.23.0/\:\%font/\:\%devdvi/\:\%generate/\:\%texi.map
.TQ
.I /usr/\:\%share/\:\%groff/\:\%1.23.0/\:\%font/\:\%devdvi/\:\%generate/\:\%texitt.map
.TQ
.I /usr/\:\%share/\:\%groff/\:\%1.23.0/\:\%font/\:\%devdvi/\:\%generate/\:\%texmi.map
.TQ
.I /usr/\:\%share/\:\%groff/\:\%1.23.0/\:\%font/\:\%devdvi/\:\%generate/\:\%texr.map
.TQ
.I /usr/\:\%share/\:\%groff/\:\%1.23.0/\:\%font/\:\%devdvi/\:\%generate/\:\%texsy.map
.TQ
.I /usr/\:\%share/\:\%groff/\:\%1.23.0/\:\%font/\:\%devdvi/\:\%generate/\:\%textex.map
.TQ
.I /usr/\:\%share/\:\%groff/\:\%1.23.0/\:\%font/\:\%devdvi/\:\%generate/\:\%textt.map
map glyph indices in \*[tx] fonts to
.I groff
ordinary and special character identifiers.
.
.I \%ec.map
is used for
.BR TREC ,
.BR TIEC ,
.BR TBEC ,
.BR TBIEC ,
.BR HREC ,
.BR HIEC ,
.BR HBEC ,
.BR HBIEC ,
.BR CWEC ,
and
.BR CWIEC ;
.I \%msam.map
for
.BR SA ;
.I \%msbm.map
for
.BR SB ;
.I \%tc.map
for
.BR TRTC ,
.BR TITC ,
.BR TBTC ,
.BR TBITC ,
.BR HRTC ,
.BR HITC ,
.BR HBTC ,
.BR HBITC ,
.BR CWTC ,
and
.BR CWITC ;
.I \%texb.map
for
.BR TB ,
.BR HR ,
.BR HI ,
.BR HB ,
and
.BR HBI ;
.I \%texex.map
for
.BR EX ;
.I \%texi.map
for
.B TI
and
.BR TBI ;
.I \%texitt.map
for
.BR CWI ;
.I \%texmi.map
for
.BR MI ;
.I \%texr.map
for
.BR TR ;
.I \%texsy.map
for
.BR S ;
.I \%textex.map
for
.BR SC ;
and
.I \%textt.map
for
.BR CW .
.
.
.\" ====================================================================
.SH "See also"
.\" ====================================================================
.
.MR groff 1 ,
.MR grodvi 1 ,
.MR groff_font 5
.
.
.\" Clean up.
.rm tx
.
.\" Restore compatibility mode (for, e.g., Solaris 10/11).
.cp \n[*groff_tfmtodit_1_man_C]
.do rr *groff_tfmtodit_1_man_C
.
.
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