117 lines
2.8 KiB
Plaintext
117 lines
2.8 KiB
Plaintext
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.TH FACE 6
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.SH NAME
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face \- face files
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.SH DESCRIPTION
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The directories
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.B /usr/$user/lib/face
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and
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.B /lib/face
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contain a hierarchy of images of people.
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In those directories are subdirectories named by the sizes of
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the corresponding image files:
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.B 48x48x1
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(48 by 48 pixels, one bit per pixel);
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.B 48x48x2
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(48 by 48 pixels, two (grey) bits per pixel);
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.B 48x48x4
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(48 by 48 pixels, four (grey) bits per pixel);
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.B 48x48x8
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(48 by 48 pixels, eight (color-mapped) bits per pixel);
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.B 512x512x8
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(512 by 512 pixels, eight (color-mapped) bits per pixel);
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.B 512x512x24
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(512 by 512 pixels, twenty-four bits per pixel (3 times 8 bits
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per color)).
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The large files serve no special purpose; they are stored
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as images
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(see
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.IR image (6)).
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The small files are the `icons' displayed by
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.B faces
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and
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.B seemail
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(see
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.IR faces (1));
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for depths less than 4, their format is special.
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.PP
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One- and two-bit deep icons are stored as text, one line of the file to one scan line
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of display.
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Each line is divided into 8-bit, 16-bit, or 32-bit big-endian words,
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stored as a list of comma-separated hexadecimal C constants,
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such as:
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.IP
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.EX
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0x9200, 0x1bb0, 0x003e,
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.EE
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.PP
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This odd format is historical and the programs that read it
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are somewhat forgiving about blanks and the need for commas.
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.PP
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The files
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.BR lib/face/*/.dict
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hold a correspondence between users at machines
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and face files.
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The format is
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.IP
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.EX
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.I machine\fB/\fPuser directory\fB/\fPfile\fB.\fPver
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.EE
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.PP
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The
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.I machine
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is the domain name of the machine sending the message,
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and
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.I user
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the name of the user sending it, as recorded in
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.BR /sys/log/mail .
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The
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.I directory
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is a further subdirectory of (say)
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.BR /lib/face/48x48x1 ,
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named by a single letter corresponding to the first character
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of the user names. The
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.I file
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is the name of the file, typically but not always the user name,
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and
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.I ver
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is a number to distinguish different images, for example to
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distinguish the image for Bill Gates from the image for Bill Joy,
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both of which might otherwise be called
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.BR b/bill .
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For example, Bill Gates might be represented by the line
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.IP
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.EX
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microsoft.com/bill b/bill.1
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.EE
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.PP
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If multiple entries exist for a user in the various
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.B .dict
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files,
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.I faces
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chooses the highest pixel size less than or equal to that of the
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display on which it is running.
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.PP
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Finally, or rather firstly, the file
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.B /lib/face/.machinelist
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contains a list of machine/domain pairs, one per line,
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to map any of a set of machines to a single domain name to
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be looked up in the
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.B .dict
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files. The machine name may be a regular expression,
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so for example the entry
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.IP
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.EX
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\&.*research\e.bell-labs\e.com astro
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.EE
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.PP
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maps any of the machines in Bell Labs Research into the
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shorthand name
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.BR astro ,
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which then appears as a domain name in the
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.B .dict
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files.
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.SH "SEE ALSO"
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.IR mail (1),
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.IR tweak (1),
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.IR image (6)
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