glenda.party
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$home/manuals/9front/6/font
term% cat index.txt
FONT(6)                          Games Manual                          FONT(6)



NAME
       font, subfont - external format for fonts and subfonts

SYNOPSIS
       #include <draw.h>

DESCRIPTION
       Fonts and subfonts are described in cachechars(2).

       External  fonts are described by a plain text file that can be read us‐
       ing openfont.  The format of the file is a header followed by any  num‐
       ber  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  readsubfont  (see  graphics(2)).   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.

       External subfonts are represented in a more rigid format  that  can  be
       read  and  written using readsubfont and writesubfont (see subfont(2)).
       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  image(6).
       The  subfont header has 3 decimal strings: n, height, and ascent.  Each
       number is right-justified and blank padded in 11  characters,  followed
       by  a  blank.   The character info consists of n+1 6-byte entries, each
       giving the Fontchar x (2 bytes, low order  byte  first),  top,  bottom,
       left, and width.  The x field of the last Fontchar is used to calculate
       the image width of the previous character; the other fields in the last
       Fontchar are irrelevant.

       Note  that  the convention of using the character with value zero (NUL)
       to represent characters of zero width (see draw(2))  means  that  fonts
       should have, as their zeroth character, one with non-zero width.

FILES
       /lib/font/bit/*
              font directories

SEE ALSO
       graphics(2), draw(2), cachechars(2), subfont(2)



                                                                       FONT(6)