1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
<!DOCTYPE html>
<html>
<!-- Created by GNU Texinfo 7.0.3, https://www.gnu.org/software/texinfo/ -->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<!-- This manual documents GNU troff version 1.23.0.
Copyright � 1994-2023 Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with no
Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
copy of the license is included in the section entitled "GNU Free
Documentation License". -->
<title>Device and Font Description Files (The GNU Troff Manual)</title>
<meta name="description" content="Device and Font Description Files (The GNU Troff Manual)">
<meta name="keywords" content="Device and Font Description Files (The GNU Troff Manual)">
<meta name="resource-type" content="document">
<meta name="distribution" content="global">
<meta name="Generator" content="makeinfo">
<meta name="viewport" content="width=device-width,initial-scale=1">
<link href="index.html" rel="start" title="Top">
<link href="Request-Index.html" rel="index" title="Request Index">
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
<link href="File-Formats.html" rel="up" title="File Formats">
<link href="gtroff-Output.html" rel="prev" title="gtroff Output">
</head>
<body lang="en">
<div class="section-level-extent" id="Device-and-Font-Description-Files">
<div class="nav-panel">
<p>
Previous: <a href="gtroff-Output.html" accesskey="p" rel="prev"><code class="code">gtroff</code> Output</a>, Up: <a href="File-Formats.html" accesskey="u" rel="up">File Formats</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Request-Index.html" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<h3 class="section" id="Device-and-Font-Description-Files-1">6.2 Device and Font Description Files</h3>
<a class="index-entry-id" id="index-font-files"></a>
<a class="index-entry-id" id="index-files_002c-font"></a>
<p>The <code class="code">groff</code> font and output device description formats are slight
extensions of those used by <abbr class="acronym">AT&T</abbr> device-independent
<code class="code">troff</code>. In distinction to the <abbr class="acronym">AT&T</abbr> implementation,
<code class="code">groff</code> lacks a binary format; all files are text
files.<a class="footnote" id="DOCF125" href="groff.html_fot.html#FOOT125"><sup>125</sup></a> The device and font description files for a device <var class="var">name</var>
are stored in a <samp class="file">dev<var class="var">name</var></samp> directory. The device description
file is called <samp class="file">DESC</samp>, and, for each font supported by the device,
a font description file is called <samp class="file"><var class="var">f</var></samp>, where
<var class="var">f</var> is usually an abbreviation of a font’s name and/or style.
For example, the <code class="code">ps</code> (PostScript) device has <code class="code">groff</code> font
description files for Times roman (<samp class="file">TR</samp>) and Zapf Chancery Medium
italic (<samp class="file">ZCMI</samp>), among many others, while the <code class="code">utf8</code> device
(for terminal emulators) has only font descriptions for the roman,
italic, bold, and bold-italic styles (<samp class="file">R</samp>, <samp class="file">I</samp>, <samp class="file">B</samp>, and
<samp class="file">BI</samp>, respectively).
</p>
<p>Device and font description files are read both by the formatter, GNU
<code class="code">troff</code>, and by output drivers. The programs delegate these files’
processing to an internal library, <samp class="file">libgroff</samp>, ensuring their
consistent interpretation.
</p>
<ul class="mini-toc">
<li><a href="DESC-File-Format.html" accesskey="1"><samp class="file">DESC</samp> File Format</a></li>
<li><a href="Font-Description-File-Format.html" accesskey="2">Font Description File Format</a></li>
</ul>
</div>
</body>
</html>
|
