VFONT(5)							File Formats Manual							  VFONT(5)

NAME

       vfont - font formats for the Benson-Varian or Versatec

SYNOPSIS

       /usr/share/vfont/*

DESCRIPTION

       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 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/share/vfont/*

SEE ALSO

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

7th Edition							 October 22, 1996							  VFONT(5)