FONT(6)                                                   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 using openfont. 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 base-
          line.  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 sub-
          font, 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 cov-
          ered 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 sub-
          font 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 char-
          acter, one with non-zero width.

     𝗙𝗜𝗟𝗘𝗦
          /𝚕𝚒𝚋/𝚏𝚘𝚗𝚝/𝚋𝚒𝚝/*  font directories

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