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