COMPFACE(3) Library Functions Manual COMPFACE(3)NAME
compface, uncompface - compress and expand 48x48x1 face image files
SYNOPSIS
compface (buf)
uncompface (buf)
char *buf
DESCRIPTION
compface is a function for generating highly compressed representations of 48x48x1 face image files. uncompface is an inverse function
which performs an inverse transformation with no loss of data. The algorithm used is highly tuned for its purpose and achieves better than
a five to one compression ratio on average. In both functions, input is via a NULL terminated string and a NULL terminated output string
is written over the input string. Buf should therefore point to a block of 2K size or more to avoid buffer overruns during output genera-
tion.
The input format for compface (and the output format for uncompface) is 48 lines each of 3 sixteen bit hexadecimal integers, comma termi-
nated in C initialiser style. The output format of compface (and the input format for uncompface) is some number of lines made up of a
space followed by printable characters (in the range ``!'' to ``~'' inclusive). The first line contains 72 characters and following lines
contain 79 characters except that the last line may be short.
This version of compface has been patched to also be able to handle normal XBM images. uncompface will produce XBM output only if the -X
switch is applied.
The amount of compression obtained varies between face image files but the output of compface averages less than 200 characters. The aver-
age number of output lines is three.
DIAGNOSTICS
The return value is normally 0. 1 will be returned if extra input has been ignored during a compress operation. -1 is returned in the
case of an invalid input format. -2 is returned if an internal buffer overrun occurs.
SEE ALSO Compface(1)
25 January 1990 COMPFACE(3)
Check Out this Related Man Page
FACE(6) Games Manual FACE(6)NAME
face - face files
DESCRIPTION
The directory /lib/face contains a hierarchy of images of people. In that directory are subdirectories named by the sizes of the corre-
sponding image files: 48x48x1 (48 by 48 pixels, one bit per pixel); 48x48x2 (48 by 48 pixels, two bits per pixel); 512x512x8 (512 by 512
pixels, eight bits per pixel); 512x512x24 (512 by 512 pixels, twenty-four bits per pixel (3 times 8 bits per color)). The large files
serve no special purpose; they are stored either as bitmaps (see bitmap(6)) or as picture files (see picfile(9.6). The small files are the
`icons' displayed by seemail (see mail(1)); their format is special.
Icons are stored as text, one line of the file to one scan line of display. Each line is divided into 8-bit, 16-bit, or 32-bit big-endian
words, stored as a list of comma-separated hexadecimal C constants, such as:
0x9200, 0x1bb0, 0x003e,
This odd format is historical and the programs that read it are somewhat forgiving about blanks and the need for commas.
The files /lib/face/*/.dict hold a correspondence between users at machines and face files. The format is
machine/user directory/file.ver
The machine is the domain name of the machine sending the message, and user the name of the user sending it, as recorded in /sys/log/mail.
The directory is a further subdirectory of (say) /lib/face/48x48x1, named by a single letter corresponding to the first character of the
user names. The file is the name of the file, typically but not always the user name, and ver is a number to distinguish different images,
for example to distinguish the image for Bill Gates from the image for Bill Joy, both of which might otherwise be called b/bill. For exam-
ple, Bill Gates might be represented by the line
microsoft.com/bill b/bill.1
If multiple entries exist for a user in the various .dict files, seemail chooses the highest pixel size less than or equal to that of the
display on which it is running.
Finally, or rather firstly, the file /lib/face/.machinelist contains a list of machine/domain pairs, one per line, to map any of a set of
machines to a single domain name to be looked up in the .dict files. The machine name may be a regular expression, so for example the
entry
.*research.att.com astro
maps any of the machines in AT&T Research into the shorthand name astro, which then appears as a domain name in the .dict files.
SEE ALSO mail(1), tweak(1), bitmap(6)FACE(6)