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-.TH XScreenSaver 1 "11-May-2002 (4.03)" "X Version 11"
+.TH XScreenSaver 1 "09-Nov-2013 (5.23)" "X Version 11"
.SH NAME
xscreensaver-demo - interactively control the background xscreensaver daemon
.SH SYNOPSIS
.B xscreensaver\-demo
[\-display \fIhost:display.screen\fP]
[\-prefs]
-[--crapplet]
[--debug]
.SH DESCRIPTION
The \fIxscreensaver\-demo\fP program is a graphical front-end for
preview area, and some fields that let you configure screen saver behavior.
.TP 4
.B Mode
-This option menu controls the behavior of the screen saver. The options are:
-.RS 8
-.TP 8
-.B Random Screen Saver
-When blanking the screen, select a random display mode from among those
-that are enabled and applicable. This is the default.
-.TP 8
+This option menu controls the activation behavior of the screen saver.
+The options are:
+.RS 4
+.TP 4
+.B Disable Screen Saver
+Don't ever blank the screen, and don't ever allow the monitor to power down.
+.TP 4
+.B Blank Screen Only
+When blanking the screen, just go black: don't run any graphics.
+.TP 4
.B Only One Screen Saver
When blanking the screen, only ever use one particular display mode (the
one selected in the list.)
-.TP 8
-.B Blank Screen Only
-When blanking the screen, just go black: don't run any graphics hacks.
-.TP 8
-.B Disable Screen Saver
-Don't ever blank the screen, and don't ever allow the monitor to power down.
-
+.TP 4
+.B Random Screen Saver
+When blanking the screen, select a random display mode from among those
+that are enabled and applicable. If there are multiple monitors
+connected, run a different display mode on each one. This is the default.
+.TP 4
+.B Random Same Saver
+This is just like \fBRandom Screen Saver\fP, except that the \fIsame\fP
+randomly-chosen display mode will be run on all monitors, instead of
+different ones on each.
.RE
.TP 4
.B Demo List
Double-clicking in the list on the left will let you try out the indicated
demo. The screen will go black, and the program will run in full-screen
mode, just as it would if the \fIxscreensaver\fP daemon had launched it.
-Clicking the mouse again will stop the demo and un-blank the screen, making
-the dialog box visible again.
+Clicking the mouse again will stop the demo and un-blank the screen.
Single-clicking in the list will run it in the small preview pane on the
right. (But beware: many of the display modes behave somewhat differently
will blank the screen.
.TP 4
.B Cycle After
-jAfter the screensaver has been running for this long, the currently
+After the screensaver has been running for this long, the currently
running graphics demo will be killed, and a new one started.
If this is 0, then the graphics demo will never be changed:
only one demo will run until the screensaver is deactivated by user
.B Settings
This button will pop up a dialog where you can configure settings specific
to the display mode selected in the list.
+.SH SETTINGS DIALOG
+When you click on the \fISettings\fP button on the \fIDisplay Modes\fP
+tab, a configuration dialog will pop up that lets you customize settings
+of the selected display mode. Each display mode has its own custom
+configuration controls on the left side.
+
+On the right side is a paragraph or two describing the display mode.
+Below that is a \fBDocumentation\fP button that will display the display
+mode's manual page, if it has one, in a new window (since each of the
+display modes is actually a separate program, they each have their
+own manual.)
+
+The \fBAdvanced\fP button reconfigures the dialog box so that you can
+edit the display mode's command line directly, instead of using the
+graphical controls.
.SH ADVANCED TAB
This tab lets you change various settings used by the xscreensaver daemon
-itself, rather than its sub-programs.
+itself, as well as some global options shared by all of the display modes.
+
+.B Image Manipulation
+
+Some of the graphics hacks manipulate images. These settings control
+where those source images come from.
+(All of these options work by invoking the
+.BR xscreensaver\-getimage (1)
+program, which is what actually does the work.)
+.RS 4
.TP 4
.B Grab Desktop Images
-Some of the graphics hacks manipulate images. If this option is selected,
-then they are allowed to manipulate the desktop image, that is, a display
-mode might draw a picture of your desktop melting, or being distorted in
-some way. The security-paranoid might want to disable this option, because
-if it is set, it means that the windows on your desktop will occasionally
-be visible while your screen is locked. Others will not be able
-to \fIdo\fP anything, but they may be able to \fIsee\fP whatever you
-left on your screen.
+If this option is selected, then they are allowed to manipulate the
+desktop image, that is, a display mode might draw a picture of your
+desktop melting, or being distorted in some way. The
+security-paranoid might want to disable this option, because if it is
+set, it means that the windows on your desktop will occasionally be
+visible while your screen is locked. Others will not be able to
+\fIdo\fP anything, but they may be able to \fIsee\fP whatever you left
+on your screen.
.TP 4
.B Grab Video Frames
If your system has a video capture card, selecting this option will allow
.TP 4
.B Choose Random Image
If this option is set, then the image-manipulating modes will select a
-random image file from disk, from the directory you specify in the text
-entry field. That directory will be recursively searched for files,
-and it is assumed that all the files under that directory are images.
-
-If more than one of these options are selected, then one will be chosen at
-random. If none of them are selected, then an image of video colorbars will
-be used instead.
+random image file to operate on, from the specified source. That
+source may be a local directory, which will be recursively searched
+for images. Or, it may be the URL of an RSS or Atom feed (e.g., a
+Flickr gallery), in which case a random image from that feed will be
+selected instead. The contents of the feed will be cached locally and
+refreshed periodically as needed.
+.PP
+If more than one of the above image-related options are selected, then
+one will be chosen at random. If none of them are selected, then an
+image of video colorbars will be used instead.
+.RE
+.PP
+.B Text Manipulation
-(All three of these options work by invoking the
-.BR xscreensaver\-getimage (1)
+Some of the display modes display and manipulate text. The following
+options control how that text is generated. (These parameters control
+the behavior of the
+.BR xscreensaver\-text (1)
program, which is what actually does the work.)
+.RS 4
.TP 4
-.B Verbose Diagnostics
-Whether to print lots of debugging information.
+.B Host Name and Time
+If this checkbox is selected, then the text used by the screen savers
+will be the local host name, OS version, date, time, and system load.
.TP 4
-.B Display Subprocess Errors
-If this is set, then if one of the graphics demos prints something to
-stdout or stderr, it will show up on the screen immediately (instead of
-being lost in a hidden terminal or file that you can't see.)
-
-If you change this option, it will only take effect the next time the
-xscreensaver daemon is restarted. (All other settings take effect
-immediately.)
+.B Text
+If this checkbox is selected, then the literal text typed in the
+field to its right will be used. If it contains % escape sequences,
+they will be expanded as per
+.BR strftime (2).
+.TP 4
+.B Text File
+If this checkbox is selected, then the contents of the corresponding
+file will be displayed.
.TP 4
-.B Display Splash Screen at Startup
-Normally when xscreensaver starts up, it briefly displays a splash dialog
-showing the version number, a \fIHelp\fP button, etc. If this option is
-turned off, the splash screen will not be shown at all.
+.B Program
+If this checkbox is selected, then the given program will be run,
+repeatedly, and its output will be displayed.
+.TP 4
+.B URL
+If this checkbox is selected, then the given HTTP URL will be downloaded
+and displayed repeatedly. If the document contains HTML, RSS, or Atom,
+it will be converted to plain-text first.
+
+Note: this re-downloads the document every time the screen saver
+runs out of text, so it will probably be hitting that web server multiple
+times a minute. Be careful that the owner of that server doesn't
+consider that to be abusive.
+.RE
+.PP
+.B Power Management Settings
+
+These settings control whether, and when, your monitor powers down.
+.RS 4
.TP 4
.B Power Management Enabled
Whether the monitor should be powered down after a period of inactivity.
power down after this much idle time. This duration should be greater
than or equal to \fISuspend\fP.
.TP 4
-.B Install Colormap
-Whether to install a private colormap while the screensaver is active, so
-that the graphics hacks can get as many colors as possible. (This only
-applies when the screen's default visual is being used, since non-default
-visuals get their own colormaps automatically.) This can also be overridden
-on a per-demo basis.
+.B Quick Power-off in "Blank Only" Mode
+If the display mode is set to \fIBlank Screen Only\fP and this is
+checked, then the monitor will be powered off immediately upon
+blanking, regardless of the other power-management settings. In this
+way, the power management idle-timers can be completely disabled, but
+the screen will be powered off when black. (This might be preferable
+on laptops.)
+.RE
+.PP
+.B Fading and Colormaps
+
+These options control how the screen fades to or from black when
+a screen saver begins or ends.
+.RS 4
.TP 4
.B Fade To Black When Blanking
If selected, then when the screensaver activates, the current contents
.B Fade Duration
When fading or unfading are selected, this controls how long the fade will
take.
+.TP 4
+.B Install Colormap
+On 8-bit screens, whether to install a private colormap while the
+screensaver is active, so that the graphics hacks can get as many
+colors as possible. This does nothing if you are running in 16-bit
+or better.
.PP
+.RE
There are more settings than these available, but these are the most
commonly used ones; see the manual for
.BR xscreensaver (1)
for other parameters that can be set by editing the \fI~/.xscreensaver\fP
file, or the X resource database.
-.SH SETTINGS DIALOG
-When you click on the \fISettings\fP button on the \fIDisplay Modes\fP
-tab, a configuration dialog will pop up that lets you customize settings
-of the selected display mode. Each display mode has its own custom
-configuration controls on the left side.
-
-On the right side is a paragraph or two describing the display mode.
-Below that is a \fBDocumentation\fP button that will display the display
-mode's manual page, if it has one, in a new window (since each of the
-display modes is actually a separate program, they each may have their
-own manual.)
-
-The \fBAdvanced\fP button reconfigures the dialog box so that you can
-edit the display mode's command line directly, instead of using the
-graphical controls. It also lets you configure the X visual type that
-this mode will require. If you specify one (other than \fIAny\fP) then
-the program will only be run on that kind of visual. For example, you
-can specify that a particular program should only be run if color is
-available, and another should only be run in monochrome. See the
-discussion of the \fIprograms\fP parameter in the \fIConfiguration\fP
-section of the
-.BR xscreensaver (1)
-manual.
.SH COMMAND-LINE OPTIONS
.I xscreensaver\-demo
accepts the following command line options.
Start up with the \fBAdvanced\fP tab selected by default
instead of the \fBDisplay Modes\fP tab.
.TP 8
-.B \-crapplet
-For use by the Gnome Control Center code: this causes this program to
-be embedded inside the Control Center window.
-.TP 8
.B \-debug
Causes lots of diagnostics to be printed on stderr.
.P
to find the sub-programs to run. However, note that the sub-programs
are actually launched by the \fIxscreensaver\fP daemon, not
by \fIxscreensaver-demo\fP itself. So, what matters is what \fB$PATH\fP
-the \fIxscreensaver\fP program sees.
+that the \fIxscreensaver\fP program sees.
.TP 8
.B HOME
for the directory in which to read and write the \fI.xscreensaver\fP file.
.B XENVIRONMENT
to get the name of a resource file that overrides the global resources
stored in the RESOURCE_MANAGER property.
+.TP 8
+.B HTTP_PROXY\fR or \fPhttp_proxy
+to get the default HTTP proxy host and port.
.SH UPGRADES
-The latest version can always be found at
-http://www.jwz.org/xscreensaver/
+The latest version of xscreensaver, an online version of this manual,
+and a FAQ can always be found at http://www.jwz.org/xscreensaver/
.SH SEE ALSO
.BR X (1),
.BR xscreensaver (1),
.BR xscreensaver\-command (1),
-.BR xscreensaver\-getimage (1)
+.BR xscreensaver\-getimage (1),
+.BR xscreensaver\-text (1)
.SH COPYRIGHT
-Copyright \(co 1992, 1993, 1997, 1998, 1999, 2000, 2001, 2002
-by Jamie Zawinski. Permission to use, copy, modify, distribute, and sell
-this software and its documentation for any purpose is hereby granted without
-fee, provided that the above copyright notice appear in all copies and that
-both that copyright notice and this permission notice appear in supporting
-documentation. No representations are made about the suitability of this
-software for any purpose. It is provided "as is" without express or implied
-warranty.
+Copyright \(co 1992-2013 by Jamie Zawinski.
+Permission to use, copy, modify, distribute, and sell this software
+and its documentation for any purpose is hereby granted without fee,
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in
+supporting documentation. No representations are made about the
+suitability of this software for any purpose. It is provided "as is"
+without express or implied warranty.
.SH AUTHOR
Jamie Zawinski <jwz@jwz.org>, 13-aug-92.
projects / xscreensaver / blobdiff