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<title>Font Positions (The GNU Troff Manual)</title>
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<h4 class="subsection" id="Font-Positions-1">5.19.3 Font Positions</h4>
<a class="index-entry-id" id="index-font-positions"></a>
<a class="index-entry-id" id="index-positions_002c-font"></a>
<p>To support typeface indirection through abstract styles, and for
compatibility with <abbr class="acronym">AT&T</abbr> <code class="code">troff</code>, the formatter maintains
a list of font <em class="dfn">positions</em> at which fonts required by a document are
<em class="dfn">mounted</em>. An output device’s description file <samp class="file">DESC</samp>
typically configures a set of pre-mounted fonts; see <a class="ref" href="Device-and-Font-Description-Files.html">Device and Font Description Files</a>. A font need not be explicitly mounted before
it is selected; GNU <code class="code">troff</code> will search <code class="env">GROFF_FONT_PATH</code> for
it by name and mount it at the first free mounting position on demand.
</p>
<dl class="first-deffn">
<dt class="deffn" id="index-_002efp"><span class="category-def">Request: </span><span><strong class="def-name"><code class="t">.fp</code></strong> <var class="def-var-arguments">pos id [<span class="r"><i class="slanted">font-description-file-name</i></span>]</var><a class="copiable-link" href='#index-_002efp'> ¶</a></span></dt>
<dd><a class="index-entry-id" id="index-fp"></a>
</dd><dt class="deffnx def-cmd-deffn" id="index-_005cn_005b_002ef_005d"><span class="category-def">Register: </span><span><strong class="def-name"><code class="t">\n[.f]</code></strong><a class="copiable-link" href='#index-_005cn_005b_002ef_005d'> ¶</a></span></dt>
<dd><a class="index-entry-id" id="index-_002ef"></a>
</dd><dt class="deffnx def-cmd-deffn" id="index-_005cn_005b_002efp_005d"><span class="category-def">Register: </span><span><strong class="def-name"><code class="t">\n[.fp]</code></strong><a class="copiable-link" href='#index-_005cn_005b_002efp_005d'> ¶</a></span></dt>
<dd><a class="index-entry-id" id="index-_002efp-1"></a>
<a class="index-entry-id" id="index-mounting-a-font-_0028fp_0029"></a>
<a class="index-entry-id" id="index-font_002c-mounting-_0028fp_0029"></a>
<p>Mount a font under the name <var class="var">id</var> at mounting position <var class="var">pos</var>, a
non-negative integer. When the formatter starts up, it reads the output
device’s description to mount an initial set of faces, and selects font
position 1. Position 0 is unused by default. Unless the
<var class="var">font-description-file-name</var> argument is given, <var class="var">id</var> should be
the name of a font description file stored in a directory corresponding
to the selected output device. GNU <code class="code">troff</code> does not traverse
directories to locate the font description file.
</p>
<a class="index-entry-id" id="index-font-aliasing-with-third-argument-to-fp-request"></a>
<a class="index-entry-id" id="index-aliasing-fonts-with-third-argument-to-fp-request"></a>
<p>The optional third argument enables font names to be aliased, which can
be necessary in compatibility mode since AT&T <code class="code">troff</code> syntax
affords no means of identifying fonts with names longer than two
characters, like ‘<samp class="samp">TBI</samp>’ or ‘<samp class="samp">ZCMI</samp>’, in a font selection escape
sequence. See <a class="xref" href="Compatibility-Mode.html">Compatibility Mode</a>. You can also alias fonts on
mounting for convenience or abstraction. (See below regarding the
<code class="code">.fp</code> register.)
</p>
<div class="example">
<div class="group"><pre class="example-preformatted">.fp \n[.fp] SC ZCMI
Send a \f(SChand-written\fP thank-you note.
.fp \n[.fp] Emph TI
.fp \n[.fp] Strong TB
Are \f[Emph]these names\f[] \f[Strong]comfortable\f[]?
</pre></div></div>
<p>‘<samp class="samp">DESC</samp>’, ‘<samp class="samp">P</samp>’, and non-negative integers are not usable as font
identifiers.
</p>
<a class="index-entry-id" id="index-font-position-register-_0028_002ef_0029"></a>
<p>The position of the currently selected font (or abstract style) is
available in the read-only register ‘<samp class="samp">.f</samp>’. It is associated with
the environment (see <a class="pxref" href="Environments.html">Environments</a>).
</p>
<p>You can copy the value of <code class="code">.f</code> to another register to save it for
later use.
</p>
<div class="example">
<div class="group"><pre class="example-preformatted">.nr saved-font \n[.f]
<span class="r">… <i class="i">text involving many font changes</i> …</span>
.ft \n[saved-font]
</pre></div></div>
<a class="index-entry-id" id="index-next-free-font-position-register-_0028_002efp_0029"></a>
<p>The index of the next (non-zero) free font position is available in the
read-only register ‘<samp class="samp">.fp</samp>’.
<a class="index-entry-id" id="index-DESC-file_002c-and-font-mounting"></a>
Fonts not listed in the <samp class="file">DESC</samp> file are automatically mounted at
position ‘<samp class="samp">\n[.fp]</samp>’ when selected with the <code class="code">ft</code> request or
<code class="code">\f</code> escape sequence. When mounting a font at a position
explicitly with the <code class="code">fp</code> request, this same practice should be
followed, although GNU <code class="code">troff</code> does not enforce this strictly.
</p></dd></dl>
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