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Annotation of researchv10dc/man/manb/vfont.5, revision 1.1.1.1

1.1       root        1: .TH VFONT 5 2/26/79 5
                      2: .UC
                      3: .SH NAME
                      4: vfont \- font formats for the Benson-Varian or Versatec
                      5: .SH SYNOPSIS
                      6: .B /usr/lib/vfont/\(**
                      7: .SH DESCRIPTION
                      8: The fonts for the printer/plotters have the following format.
                      9: Each file contains a header, an array of 256 character description
                     10: structures, and then the bit maps for the characters themselves.
                     11: The header has the following format:
                     12: .in +5
                     13: .nf
                     14: .sp
                     15: .ta 8n +\w'unsigned short  'u
                     16: struct header {
                     17:        short   magic;
                     18:        unsigned short  size;
                     19:        short   maxx;
                     20:        short   maxy;
                     21:        short   xtnd;
                     22: } header;
                     23: .fi
                     24: .in -5
                     25: .PP
                     26: The
                     27: .I magic
                     28: number is 0436 (octal).
                     29: The
                     30: .I maxx,
                     31: .I maxy,
                     32: and
                     33: .I xtnd
                     34: fields are not used at the current time.
                     35: .I Maxx
                     36: and
                     37: .I maxy
                     38: are intended to be the maximum horizontal and vertical size of
                     39: any glyph in the font, in raster lines.
                     40: The
                     41: .I size
                     42: is the size of the
                     43: bit maps for the characters in bytes.
                     44: Before the maps for the characters is an array of 256 structures for
                     45: each of the possible characters in the font.
                     46: Each element of the array has the form:
                     47: .in +5
                     48: .nf
                     49: .sp
                     50: .ta 8n +\w'unsigned short  'u
                     51: struct dispatch {
                     52:        unsigned short  addr;
                     53:        short   nbytes;
                     54:        char    up;
                     55:        char    down;
                     56:        char    left;
                     57:        char    right;
                     58:        short   width;
                     59: };
                     60: .fi
                     61: .in -5
                     62: .PP
                     63: The
                     64: .I nbytes
                     65: field is nonzero for characters which actually exist.
                     66: For such characters, the
                     67: .I addr
                     68: field is an offset into the rest of the file where the data for
                     69: that character begins.
                     70: There are
                     71: .I up+down
                     72: rows of data for each character,
                     73: each of which has
                     74: .I left+right
                     75: bits, rounded up to a number of bytes.
                     76: The
                     77: .I width
                     78: field is not used by vcat,
                     79: although it is used by
                     80: .IR vwidth (1)
                     81: to make width tables for
                     82: .IR troff .
                     83: It represents the logical width of the glyph, in raster lines,
                     84: and shows where the base point of the next glyph would be.
                     85: .SH FILES
                     86: /usr/lib/vfont/\(**
                     87: .SH SEE ALSO
                     88: troff(1), pti(1), vpr(1), vtroff(1), vwidth(1), vfontinfo(1), fed(1)

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