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VFONT(5)                      File Formats Manual                     VFONT(5)

       vfont - font formats for the Benson-Varian or Versatec


       The  fonts  for  the  printer/plotters have the following format.  Each
       file contains a header, an array of 256  character  description  struc-
       tures, 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 struc-
       tures 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.


       troff(1), pti(1), vpr(1), vtroff(1), vfontinfo(1)

                               26 February 1979                       VFONT(5)