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author | rsc <devnull@localhost> | 2005-01-03 06:40:20 +0000 |
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committer | rsc <devnull@localhost> | 2005-01-03 06:40:20 +0000 |
commit | 058b0118a52061ad57694c01fc8763b22b789c4d (patch) | |
tree | 6685f04dea5ed68edaa34998c976aed34c55fe94 /man/man7/font.7 | |
parent | 2600337aa704efbeba8201e88147a764b4fd2b90 (diff) | |
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Some man pages.
Diffstat (limited to 'man/man7/font.7')
-rw-r--r-- | man/man7/font.7 | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/man/man7/font.7 b/man/man7/font.7 new file mode 100644 index 00000000..f651a58a --- /dev/null +++ b/man/man7/font.7 @@ -0,0 +1,87 @@ +.TH FONT 7 +.SH NAME +font, subfont \- external format for fonts and subfonts +.SH SYNOPSIS +.B #include <draw.h> +.SH DESCRIPTION +Fonts and subfonts are described in +.IR cachechars (3). +.PP +External fonts are described by a plain text file that can be read using +.IR openfont . +The format of the file is a header followed by any number of +subfont range specifications. +The header contains two numbers: the height and the ascent, both in pixels. +The height is the inter-line spacing and the ascent is the distance +from the top of the line to the baseline. These numbers are chosen +to display consistently all the subfonts of the font. +A subfont range specification contains two or three numbers and a file name. +The numbers are the inclusive range of characters covered by the subfont, +with an optional starting position within the subfont, +and the file name names an external file suitable for +.I readsubfont +(see +.IR graphics (3)). +The minimum number of a covered range is mapped to the specified starting position +(default zero) of the +corresponding subfont. +If the subfont file name does not begin with a slash, it is taken relative to the +directory containing the font file. +Each field must be followed by some white space. +Each numeric field may be C-format decimal, octal, or hexadecimal. +.PP +External subfonts are represented in a more rigid format +that can be read and written using +.I readsubfont +and +.I writesubfont +(see +.IR subfont (3)). +The format for subfont files is: an image containing character glyphs, +followed by a subfont header, followed by character information. +The image has the format for external image files described in +.IR image (7). +The subfont header has 3 +decimal strings: +.BR n , +.BR height , +and +.BR ascent . +Each number is right-justified and blank padded in 11 characters, followed by a blank. +The character +.B info +consists of +.BR n +1 +6-byte entries, each giving the +.B Fontchar +.B x +(2 bytes, low order byte first), +.BR top , +.BR bottom , +.BR left , +and +.BR width . +The +.B x +field of the last +.B Fontchar +is used to calculate the image width +of the previous character; the other fields in the last +.B Fontchar +are irrelevant. +.PP +Note that the convention of using the character with value zero (NUL) to represent +characters of zero width (see +.IR draw (3)) +means that fonts should have, as their zeroth character, +one with non-zero width. +.SH FILES +.TF /lib/font/bit/* +.TP +.B /lib/font/bit/* +font directories +.SH "SEE ALSO" +.IR graphics (3), +.IR draw (3), +.IR cachechars (3), +.IR subfont (3) |