face.7 (2823B)
1 .TH FACE 7 2 .SH NAME 3 face \- face files 4 .SH DESCRIPTION 5 The directories 6 .B /usr/$user/lib/face 7 and 8 .B /lib/face 9 contain a hierarchy of images of people. 10 In those directories are subdirectories named by the sizes of 11 the corresponding image files: 12 .B 48x48x1 13 (48 by 48 pixels, one bit per pixel); 14 .B 48x48x2 15 (48 by 48 pixels, two (grey) bits per pixel); 16 .B 48x48x4 17 (48 by 48 pixels, four (grey) bits per pixel); 18 .B 48x48x8 19 (48 by 48 pixels, eight (color-mapped) bits per pixel); 20 .B 512x512x8 21 (512 by 512 pixels, eight (color-mapped) bits per pixel); 22 .B 512x512x24 23 (512 by 512 pixels, twenty-four bits per pixel (3 times 8 bits 24 per color)). 25 The large files serve no special purpose; they are stored 26 as images 27 (see 28 .MR image (7) ). 29 The small files are the `icons' displayed by 30 .B faces 31 and 32 .B seemail 33 (see Plan 9's 34 .IR faces (1)); 35 for depths less than 4, their format is special. 36 .PP 37 One- and two-bit deep icons are stored as text, one line of the file to one scan line 38 of display. 39 Each line is divided into 8-bit, 16-bit, or 32-bit big-endian words, 40 stored as a list of comma-separated hexadecimal C constants, 41 such as: 42 .IP 43 .EX 44 0x9200, 0x1bb0, 0x003e, 45 .EE 46 .PP 47 This odd format is historical and the programs that read it 48 are somewhat forgiving about blanks and the need for commas. 49 .PP 50 The files 51 .BR lib/face/*/.dict 52 hold a correspondence between users at machines 53 and face files. 54 The format is 55 .IP 56 .EX 57 .I machine\fB/\fPuser directory\fB/\fPfile\fB.\fPver 58 .EE 59 .PP 60 The 61 .I machine 62 is the domain name of the machine sending the message, 63 and 64 .I user 65 the name of the user sending it. 66 The 67 .I directory 68 is a further subdirectory of (say) 69 .BR /lib/face/48x48x1 , 70 named by a single letter corresponding to the first character 71 of the user names. The 72 .I file 73 is the name of the file, typically but not always the user name, 74 and 75 .I ver 76 is a number to distinguish different images, for example to 77 distinguish the image for Bill Gates from the image for Bill Joy, 78 both of which might otherwise be called 79 .BR b/bill . 80 For example, Bill Gates might be represented by the line 81 .IP 82 .EX 83 microsoft.com/bill b/bill.1 84 .EE 85 .PP 86 If multiple entries exist for a user in the various 87 .B .dict 88 files, 89 .I faces 90 chooses the highest pixel size less than or equal to that of the 91 display on which it is running. 92 .PP 93 Finally, or rather firstly, the file 94 .B /lib/face/.machinelist 95 contains a list of machine/domain pairs, one per line, 96 to map any of a set of machines to a single domain name to 97 be looked up in the 98 .B .dict 99 files. The machine name may be a regular expression, 100 so for example the entry 101 .IP 102 .EX 103 \&.*research\e.bell-labs\e.com astro 104 .EE 105 .PP 106 maps any of the machines in Bell Labs Research into the 107 shorthand name 108 .BR astro , 109 which then appears as a domain name in the 110 .B .dict 111 files. 112 .SH "SEE ALSO" 113 .MR mail (1) , 114 .MR tweak (1) , 115 .MR image (7)