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Plan 9 - man page for font (plan9 section 6)

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FONT(6) 										  FONT(6)

       font, subfont - external format for fonts and subfonts

       #include <libg.h>

       Fonts and subfonts are described in cachechars(2).

       External  fonts are described by a plain text file that can be read using rdfontfile.  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  rdsub-
       fontfile.  The minimum number of a covered range is mapped to the specified starting posi-
       tion (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 rdsubfontfile and wrsubfontfile (see subfalloc(2)).  The format  for  subfont  files
       is:  a bitmap containing character images, followed by a subfont header, followed by char-
       acter information.  The bitmap has the format for external bitmap files described in  bit-
       map(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  calcu-
       late the bitmap width of the previous character; the other fields in the last Fontchar are

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

	      font directories

       graphics(2), bitblt(2), cachechars(2), subfalloc(2)

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