1glitchpeg(6x)                 XScreenSaver manual                glitchpeg(6x)
2
3
4

NAME

6       glitchpeg - glitched image screen saver.
7

SYNOPSIS

9       glitchpeg  [--display host:display.screen] [--visual visual] [--window]
10       [--root] [--window-id  number]  [--delay  number]  [--duration  number]
11       [--count number]
12

DESCRIPTION

14       Loads  an  image, corrupts it, and then displays the corrupted version,
15       several times a second. After a while, finds a new image to corrupt.
16
17       It glitches the image by altering random bytes in the compressed  image
18       file  before de-compressing it. This creates interesting visual effects
19       on JPEG files, but doesn't work well on PNG files, since  PNG  contains
20       checksums that detect simple corruption.
21

OPTIONS

23       --visual visual
24               Specify  which  visual  to use.  Legal values are the name of a
25               visual class, or the id number (decimal or hex) of  a  specific
26               visual.
27
28       --window
29               Draw on a newly-created window.  This is the default.
30
31       --root  Draw on the root window.
32
33       --window-id number
34               Draw on the specified window.
35
36       --delay number
37               Per-frame  delay,  in  microseconds.  Default: 30000 (0.03 sec‐
38               onds).
39
40       --duration number
41               How many seconds before loading a new image.  Default: 120.
42
43       --count number
44               Number of glitches to introduce per iteration. Default: 400.
45

ENVIRONMENT

47       DISPLAY to get the default host and display number.
48
49       XENVIRONMENT
50               to get the name of a resource file that  overrides  the  global
51               resources stored in the RESOURCE_MANAGER property.
52
53       XSCREENSAVER_WINDOW
54               The window ID to use with --root.
55

SECURITY

57       Because  this  program  is feeding intentionally-invalid data into your
58       operating system's image-decoding libraries, it is possible that it may
59       crash as a result of that corrupted data.
60
61       That should not be possible -- but it might be.
62
63       Please note that if this happens, that indicates a serious security bug
64       in your system's image libraries!  It likely means that your  libraries
65       are  susceptible  to buffer overflow attacks or similar, which can lead
66       to remote code execution.  You should report that bug to the  maintain‐
67       ers of those image libraries.
68
69       In  the context of xscreensaver, when configured to load only local im‐
70       age files, this should not be a direct security  concern:  this  screen
71       saver crashing will not affect the xscreensaver daemon and will not un‐
72       lock your screen.
73

SEE ALSO

75       X(1), xscreensaver(1)
76

78       Copyright © 2018 by Jamie Zawinski.  Permission to use,  copy,  modify,
79       distribute,  and  sell this software and its documentation for any pur‐
80       pose is hereby granted without fee, provided that the  above  copyright
81       notice  appear  in  all  copies and that both that copyright notice and
82       this permission notice appear in supporting documentation.   No  repre‐
83       sentations are made about the suitability of this software for any pur‐
84       pose.  It is provided "as is" without express or implied warranty.
85

AUTHOR

87       Jamie Zawinski.
88
89
90
91X Version 11               6.06-1.fc37 (12-Dec-2022)             glitchpeg(6x)
Impressum