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<title>font(7) - Plan 9 from User Space</title>
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<tr><td width=20><td><b>FONT(7)</b><td align=right><b>FONT(7)</b>
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<p><font size=+1><b>NAME </b></font><br>
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font, subfont – external format for fonts and subfonts<br>
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<p><font size=+1><b>SYNOPSIS </b></font><br>
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<tt><font size=+1>#include <draw.h><br>
</font></tt>
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<p><font size=+1><b>DESCRIPTION </b></font><br>
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Fonts and subfonts are described in <a href="../man3/cachechars.html"><i>cachechars</i>(3)</a>.
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External fonts are described by a plain text file that can be
read using <i>openfont</i>. The format of the file is a header followed
by any number of subfont range specifications. The header contains
two numbers: the height and the ascent, both in pixels. The height
is the inter-line spacing and the ascent is the distance from
the top of the line to the baseline. These numbers are chosen
to display consistently all the subfonts of the font. A subfont
range specification contains two or three numbers and a file name.
The numbers are the inclusive range of characters covered by the
subfont, with an optional starting position within the subfont,
and the file name names an external file suitable for <i>readsubfont</i>
(see <a href="../man3/graphics.html"><i>graphics</i>(3)</a>). The minimum number of a covered range is mapped
to the specified starting position (default zero) of the corresponding
subfont. If the subfont file name does not begin with a slash,
it is taken relative to the directory containing the
font file. Each field must be followed by some white space. Each
numeric field may be C-format decimal, octal, or hexadecimal.
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External subfonts are represented in a more rigid format that
can be read and written using <i>readsubfont</i> and <i>writesubfont</i> (see
<a href="../man3/subfont.html"><i>subfont</i>(3)</a>). The format for subfont files is: an image containing
character glyphs, followed by a subfont header, followed by character
information. The image has the format for external image
files described in <a href="../man7/image.html"><i>image</i>(7)</a>. The subfont header has 3 decimal
strings: <tt><font size=+1>n</font></tt>, <tt><font size=+1>height</font></tt>, and <tt><font size=+1>ascent</font></tt>. Each number is right-justified
and blank padded in 11 characters, followed by a blank. The character
<tt><font size=+1>info</font></tt> consists of <tt><font size=+1>n</font></tt>+1 6-byte entries, each giving the <tt><font size=+1>Fontchar
x</font></tt> (2 bytes, low order byte first), <tt><font size=+1>top</font></tt>, <tt><font size=+1>bottom</font></tt>,
<tt><font size=+1>left</font></tt>, and <tt><font size=+1>width</font></tt>. The <tt><font size=+1>x</font></tt> field of the last <tt><font size=+1>Fontchar</font></tt> is used to calculate
the image width of the previous character; the other fields in
the last <tt><font size=+1>Fontchar</font></tt> are irrelevant.
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Note that the convention of using the character with value zero
(NUL) to represent characters of zero width (see <a href="../man3/draw.html"><i>draw</i>(3)</a>) means
that fonts should have, as their zeroth character, one with non-zero
width.<br>
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<p><font size=+1><b>FILES </b></font><br>
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<tt><font size=+1>/usr/local/plan9/font/*</font></tt> font directories<br>
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<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/draw.html"><i>draw</i>(3)</a>, <a href="../man3/cachechars.html"><i>cachechars</i>(3)</a>, <a href="../man3/subfont.html"><i>subfont</i>(3)</a><br>
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