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.\" ========================================================================
.\"
.IX Title "OT2KPX 1"
.TH OT2KPX 1 "2013-08-07" "fontools" "Marc Penninga"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
ot2kpx \- extract kerning information from OpenType fonts
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.IP "\fBot2kpx\fR" 8
.IX Item "ot2kpx"
\&\fBfontfile\fR
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBot2kpx\fR extract the kerning data from OpenType fonts (both \fIotf\fR
and \fIttf\fR formats) and prints it (in \fIafm\fR format) to \f(CW\*(C`stdout\*(C'\fR.
.SH "OPTIONS AND ARGUMENTS"
.IX Header "OPTIONS AND ARGUMENTS"
.IP "\fBfontfile\fR" 4
.IX Item "fontfile"
The OpenType font (in either \fIotf\fR or \fIttf\fR format).
.SH "RESTRICTIONS"
.IX Header "RESTRICTIONS"
.IP "\fB\-\fR" 4
.IX Item "-"
\&\fBot2kpx\fR doesn't implement all of the OpenType specification.
Things that are missing include: support for font files containing
multiple fonts, LookupTables with LookupTypes other than 2,
\&\*(L"kern\*(R" tables with format other than 0 and ValueRecords with
other types of data than just XAdvance data.
.Sp
Most of these limitations won't matter, since the missing features
are rare (the only fonts I know of that use them are the non-western fonts
that come with Adobe Reader). Furthermore, many of these features define
(according to the OpenType specification) \fI\*(L"subtle, device-dependent
adjustments at specific font sizes or device resolutions\*(R"\fR;
since there's no way to express such adjustments in \fIafm\fR format,
ignoring them seems to be the only option anyway.
.IP "\fB\-\fR" 4
.IX Item "-"
\&\fBot2kpx\fR collects kerning data first from the \*(L"kern\*(R" table, then from
all LookupTables associated with the \*(L"kern\*(R" feature; if a kerning pair
occurs multiple times, the first value seen is chosen.
There are (or may be) several issues with this approach:
.RS 4
.IP "\-" 4
The OpenType specification says that fonts in \fIotf\fR format shouldn't
use the \*(L"kern\*(R" table at all, just the lookups from the \*(L"\s-1GPOS\s0\*(R" table.
Many such fonts do, however, contain a \*(L"kern\*(R" table, but no \*(L"\s-1GPOS\s0\*(R" table;
so we use the \*(L"kern\*(R" table anyway.
.IP "\-" 4
Instead of reading all LookupTables, it might be better to let the user
specify a script and language and process only the LookupTables for
those values.
However, at least in the fonts I checked, all script/language combinations
eventually point to the \fIsame\fR \*(L"kern\*(R" LookupTables, so this approach
wouldn't make any difference (apart from further complicating the code).
.RE
.RS 4
.RE
.SH "AUTHOR"
.IX Header "AUTHOR"
Marc Penninga <marcpenninga@gmail.com>
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (C) 2005\-2013 Marc Penninga.
.SH "LICENSE"
.IX Header "LICENSE"
This program is free software; you can redistribute it and/or modify
it under the terms of the \s-1GNU\s0 General Public License as published
by the Free Software Foundation, either version 2 of the License,
or (at your option) any later version.
A copy of the \s-1GNU\s0 General Public License is included with \fBot2kpx\fR;
see the file \fIGPLv2.txt\fR.
.SH "DISCLAIMER"
.IX Header "DISCLAIMER"
This program is distributed in the hope that it will be useful,
but \s-1WITHOUT\s0 \s-1ANY\s0 \s-1WARRANTY\s0; without even the implied warranty of
\&\s-1MERCHANTABILITY\s0 or \s-1FITNESS\s0 \s-1FOR\s0 A \s-1PARTICULAR\s0 \s-1PURPOSE\s0.
See the \s-1GNU\s0 General Public License for more details.
.SH "RECENT CHANGES"
.IX Header "RECENT CHANGES"
(See the source code for the rest of the story.)
.IP "\fI2013\-08\-07\fR" 12
.IX Item "2013-08-07"
Replaced all \f(CW\*(C`given/when\*(C'\fR constructions in the source code by \f(CW\*(C`if\*(C'\fR's,
to avoid warnings about experimental features in Perl 5.18 and later.
.IP "\fI2012\-02\-01\fR" 12
.IX Item "2012-02-01"
Refactored the code, and fixed a number of bugs in the process.
Updated the documentation.
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