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Annotation of researchv10dc/630/man/src/p_man/man4/font.4, revision 1.1.1.1

1.1       root        1: .ds ZZ DEVELOPMENT PACKAGE
                      2: .TH FONT 4 "630 MTG"
                      3: .XE "font"
                      4: .SH NAME
                      5: font \- font file format
                      6: .SH DESCRIPTION
                      7: A font file is a file containing a description of a Font that
                      8: can be read by
                      9: .I infont(3R/3L)
                     10: or
                     11: .I loadfont(1)
                     12: and converted into a Font in the terminal.
                     13: A font file can be created by using
                     14: .IR outfont .
                     15: .PP
                     16: A font file begins with a structure that is similar to a Font.
                     17: It looks like the following:
                     18: .nf
                     19:  struct Fontheader {
                     20:         short    n;            /* number of chars in font */
                     21:         char     height;       /* height of bitmap */
                     22:         char     ascent;       /* top of bitmap to baseline */
                     23:         long     unused;       /* in case we think of more stuff */
                     24:         Fontchar info[1];      /* n+1 character descriptors */
                     25:  }
                     26: .fi
                     27: 
                     28: The fields in this structure have the same meanings as the ones in the
                     29: Font structure. There are really
                     30: .IR n +1
                     31: Fontchar structures in the info array. The only field that
                     32: contains valid data in the [n+1]th element is \f2x\f1; the leftmost
                     33: edge of the corresponding cell in the bitmap.
                     34: Each Fontchar structure starts on a long integer boundary and is padded with
                     35: null characters to the next long integer boundary and the start of the
                     36: next Fontchar structure.
                     37: Therefore, there are two nulls after each of the
                     38: .IR n + 1
                     39: Fontchars in the file.
                     40: .PP
                     41: Following this in the file is the bitmap image of the font.
                     42: This is an array holding the bit image of all the characters
                     43: in the font. It corresponds to
                     44: .I bits->base
                     45: in the Font structure.
                     46: Its size is defined as:
                     47: 
                     48:         char base[
                     49: .I height
                     50: ][
                     51: .RI (( info [
                     52: .IR n +1
                     53: ].x+31)/32)\(**4 ]
                     54: 
                     55: The last column of bits used by a font is 
                     56: .IR info [ n +1].x-1.
                     57: The width is rounded up to the nearest long integer boundary for the bitmap image.
                     58: .SH SEE ALSO
                     59: infont(3L), loadfont(1), structures(3R).

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