VFONT(5)                             BSD                              VFONT(5)



NAME
     vfont - font formats for the Benson-Varian or Versatec

SYNOPSIS
     /usr/lib/vfont/*

DESCRIPTION
     The fonts for the printer/plotters have the following format.  Each file
     contains a header, an array of 256 character description structures, and
     then the bit maps for the characters themselves.  The header has the
     following format:

          struct header {
                  short           magic;
                  unsigned short  size;
                  short           maxx;
                  short           maxy;
                  short           xtnd;
          } header;

     The magic number is 0436 (octal).  The maxx, maxy, and xtnd fields are
     not used at the current time.  maxx and maxy are intended to be the
     maximum horizontal and vertical size of any glyph in the font, in raster
     lines.  The size is the size of the bit maps for the characters in bytes.
     Before the maps for the characters is an array of 256 structures for each
     of the possible characters in the font.  Each element of the array has
     the form:

          struct dispatch {
                  unsigned short  addr;
                  short           nbytes;
                  char            up;
                  char            down;
                  char            left;
                  char            right;
                  short           width;
          };

     The nbytes field is nonzero for characters which actually exist.  For
     such characters, the addr field is an offset into the rest of the file
     where the data for that character begins.  There are up+down rows of data
     for each character, each of which has left+right bits, rounded up to a
     number of bytes.  The width field is not used by vcat, although it is to
     make width tables for troff.  It represents the logical width of the
     glyph, in raster lines, and shows where the base point of the next glyph
     would be.

FILES
     /usr/lib/vfont/*

SEE ALSO
     troff(1).