VFONT(5)                 (May 13, 1986)                  VFONT(5)

          vfont - font formats for the Benson-Varian or Versatec


          The fonts for the printer/plotters have the following for-
          mat.  Each file contains a header, an array of 256 character
          description structures, and then the bit maps for the char-
          acters 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 ele-
          ment 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.


     VFONT(5)                 (May 13, 1986)                  VFONT(5)


          troff(1), pti(1), vfontinfo(1)