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<head>
<title>subfont(3) - Plan 9 from User Space</title>
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<tr><td width=20><td>
<tr><td width=20><td><b>SUBFONT(3)</b><td align=right><b>SUBFONT(3)</b>
<tr><td width=20><td colspan=2>
<br>
<p><font size=+1><b>NAME </b></font><br>
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allocsubfont, freesubfont, installsubfont, lookupsubfont, uninstallsubfont,
subfontname, readsubfont, readsubfonti, writesubfont, stringsubfont,
strsubfontwidth, mkfont – subfont manipulation<br>
</table>
<p><font size=+1><b>SYNOPSIS </b></font><br>
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<tt><font size=+1>#include <u.h><br>
#include <libc.h><br>
#include <draw.h>
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<tt><font size=+1>Subfont* allocsubfont(char *name, int n, int height, int ascent,<br>
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Fontchar *info, Image *i)
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</font></tt>
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<tt><font size=+1>void freesubfont(Subfont *f)
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</font></tt>
<tt><font size=+1>void installsubfont(char *name, Subfont *f)
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</font></tt>
<tt><font size=+1>Subfont* lookupsubfont(Subfont *f)
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</font></tt>
<tt><font size=+1>void uninstallsubfont(Subfont *f)
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</font></tt>
<tt><font size=+1>Subfont* readsubfont(Display *d, char *name, int fd, int dolock)
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</font></tt>
<tt><font size=+1>Subfont* readsubfonti(Display *d, char *name, int fd, Image *im,<br>
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int dolock)
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<tt><font size=+1>int writesubfont(int fd, Subfont *f)
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</font></tt>
<tt><font size=+1>Point stringsubfont(Image *dst, Point p, Image *src,<br>
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Subfont *f, char *str)
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</font></tt>
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<tt><font size=+1>Point strsubfontwidth(Subfont *f, char *s)
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</font></tt>
<tt><font size=+1>Font* mkfont(Subfont *f, Rune min)<br>
</font></tt>
</table>
<p><font size=+1><b>DESCRIPTION </b></font><br>
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Subfonts are the components of fonts that hold the character images.
A font comprises an array of subfonts; see <a href="../man3/cachechars.html"><i>cachechars</i>(3)</a>. A new
<tt><font size=+1>Subfont</font></tt> is allocated and initialized with <i>allocsubfont</i>. See <a href="../man3/cachechars.html"><i>cachechars</i>(3)</a>
for the meaning of <i>n</i>, <i>height</i>, <i>ascent</i>, and <i>info</i>, and the arrangement
of characters in image <i>i</i>. The <i>name</i> is
used to identify the subfont in the subfont cache; see the descriptions
<i>lookupsubfont</i> and <i>installsubfont</i> (<i>q.v.</i>). The appropriate fields
of the returned <tt><font size=+1>Subfont</font></tt> structure are set to the passed arguments,
and the image is registered as a subfont with the graphics device
<a href="../man3/draw.html"><i>draw</i>(3)</a>. <i>Allocsubfont</i> returns 0 on failure.
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<i>Freesubfont</i> frees a subfont and all its associated structure including
the associated image. Since <i>freesbufont</i> calls <i>free</i> on <tt><font size=+1>f−>info</font></tt>,
if <tt><font size=+1>f−>info</font></tt> was not allocated by <a href="../man3/malloc.html"><i>malloc</i>(3)</a> it should be zeroed before
calling <i>subffree</i>.
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A number of subfonts are kept in external files. The convention
for naming subfont files is:<br>
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<tt><font size=+1>/usr/local/plan9/font/</font></tt><i>name</i><tt><font size=+1>/</font></tt><i>class</i><tt><font size=+1>.</font></tt><i>size</i><tt><font size=+1>.</font></tt><i>depth
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</i>
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where <i>size</i> is approximately the height in pixels of the lower
case letters (without ascenders or descenders). If there is only
one version of the subfont, the <tt><font size=+1>.</font></tt><i>depth</i> extension is elided. <i>Class</i>
describes the range of runes encoded in the subfont: <tt><font size=+1>ascii</font></tt>, <tt><font size=+1>latin1</font></tt>,
<tt><font size=+1>greek</font></tt>, etc.
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Subfonts are cached within the program, so a subfont shared between
fonts will be loaded only once. <i>Installsubfont</i> stores subfont
<i>f</i> under the given <i>name</i>, typically the file name from which it
was read. <i>Uninstallsubfont</i> removes the subfont from the cache.
Finally, <i>lookupsubfont</i> searches for a subfont with the given
<i>name</i> in the cache and returns it, or nil if no such subfont exists.
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<i>Subfontname</i> is used to locate subfonts given their names within
the fonts. The default version constructs a name given the <i>cfname</i>,
its name within the font, <i>fname</i>, the name of the font, and the
maximum depth suitable for this subfont. This interface allows
a partially specified name within a font to be resolved at
run-time to the name of a file holding a suitable subfont. Although
it is principally a routine internal to the library, <i>subfontname</i>
may be substituted by the application to provide a less file-oriented
subfont naming scheme.
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The format of a subfont file is described in <a href="../man7/font.html"><i>font</i>(7)</a>. Briefly,
it contains a image with all the characters in it, followed by
a subfont header, followed by character information. <i>Readsubfont</i>
reads a subfont from the file descriptor <i>fd</i>. The <i>name</i> is used
to identify the font in the cache. The <i>dolock</i> argument specifies
whether
the routine should synchronize use of the <i>Display</i> with other processes;
for single-threaded applications it may always be zero. <i>Readsubfonti</i>
does the same for a subfont whose associated image is already
in memory; it is passed as the argument <i>im</i>. In other words, <i>readsubfonti</i>
reads only the header and character
information from the file descriptor.
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<i>Writesubfont</i> writes on <i>fd</i> the part of a subfont file that comes
after the image. It should be preceded by a call to <i>writeimage</i>
(see <a href="../man3/allocimage.html"><i>allocimage</i>(3)</a>).
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<i>Stringsubfont</i> is analogous to <tt><font size=+1>string</font></tt> (see <a href="../man3/draw.html"><i>draw</i>(3)</a>) for subfonts.
Rather than use the underlying font caching primitives, it calls
<tt><font size=+1>draw</font></tt> for each character. It is intended for stand-alone environments
such as operating system kernels. <i>Strsubfontwidth</i> returns the
width of the string <i>s</i> in as it would appear if drawn with
<i>stringsubfont</i> in <tt><font size=+1>Subfont f</font></tt>.
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<i>Mkfont</i> takes as argument a <tt><font size=+1>Subfont</font></tt> <i>s</i> and returns a pointer to
a <tt><font size=+1>Font</font></tt> that maps the character images in <i>s</i> into the <tt><font size=+1>Runes</font></tt> <i>min</i>
to <i>min</i><tt><font size=+1>+</font></tt><i>s</i><tt><font size=+1>−>n−1</font></tt>.<br>
</table>
<p><font size=+1><b>FILES </b></font><br>
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<tt><font size=+1>/usr/local/plan9/font</font></tt> bitmap font file tree<br>
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<p><font size=+1><b>SOURCE </b></font><br>
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<tt><font size=+1>/usr/local/plan9/src/libdraw<br>
</font></tt>
</table>
<p><font size=+1><b>SEE ALSO </b></font><br>
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<a href="../man3/graphics.html"><i>graphics</i>(3)</a>, <a href="../man3/allocimage.html"><i>allocimage</i>(3)</a>, <a href="../man3/draw.html"><i>draw</i>(3)</a>, <a href="../man3/cachechars.html"><i>cachechars</i>(3)</a>, <a href="../man7/image.html"><i>image</i>(7)</a>,
<a href="../man7/font.html"><i>font</i>(7)</a><br>
</table>
<p><font size=+1><b>DIAGNOSTICS </b></font><br>
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All of the functions use the graphics error function (see <a href="../man3/graphics.html"><i>graphics</i>(3)</a>).<br>
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</table>
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