.if n .sp 1
.if t .sp .5
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-.TH XScreenSaver 1 "10-Nov-2000 (3.26)" "X Version 11"
+.TH XScreenSaver 1 "14-Aug-2004 (4.18)" "X Version 11"
.SH NAME
xscreensaver-demo - interactively control the background xscreensaver daemon
.SH SYNOPSIS
.B xscreensaver\-demo
-[\-display \fIhost:display.screen\fP] [\-prefs] [\-xrm \fIresources\fP]
+[\-display \fIhost:display.screen\fP]
+[\-prefs]
+[--crapplet]
+[--debug]
.SH DESCRIPTION
The \fIxscreensaver\-demo\fP program is a graphical front-end for
setting the parameters used by the background
and
.BR xscreensaver\-command (1)
manuals.
-.SH GRAPHICS DEMOS TAB
-On the left is a list of the names of the various display modes, and
-on the right are some fields that let you edit their behavior.
+.SH DISPLAY MODES TAB
+This page contains a list of the names of the various display modes, a
+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
+.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.
+
+.RE
.TP 4
.B Demo List
Double-clicking in the list on the left will let you try out the indicated
Clicking the mouse again will stop the demo and un-blank the screen, making
the dialog box visible again.
-Single-clicking in the list will populate the fields on the right side of
-the window.
+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
+when running in full-screen mode, so the scaled-down view might not give
+an accurate impression.)
-Each name in the list has a checkbox next to it: this is a duplicate of
-the \fIEnabled\fP checkbox, and indicates (and controls) whether
-xscreensaver will use this display mode at all. If the box is not
-checked, then this demo will not be run automatically (though you can
-run it explicitly by double-clicking on its name.)
+When \fBMode\fP is set to \fBRandom Screen Saver\fP, each name in the list
+has a checkbox next to it: this controls whether this display mode is
+enabled. If it is unchecked, then that mode will not be chosen. (Though
+you can still run it explicitly by double-clicking on its name.)
.TP 4
.B Arrow Buttons
Beneath the list are a pair of up and down arrows. Clicking on the down
mode, just as if you had double-clicked on it. The up arrow goes the other
way. This is just a shortcut for trying out all of the display modes in turn.
.TP 4
-.B Program Description
-At the top will be a brief description of the program. Below that is a
-text field where you can edit the arguments to the program as xscreensaver
-will invoke it. (Note that most of these programs have their own man pages
-that describe the command-line options they take.)
+.B Blank After
+After the user has been idle this long, the \fIxscreensaver\fP daemon
+will blank the screen.
.TP 4
-.B Enabled
-The \fIEnabled\fP checkbox controls whether xscreensaver will use this
-display mode at all. This way, all the modes can remain available, but
-you can choose which ones will be automatically run.
+.B Cycle After
+jAfter 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
+activity.
.TP 4
-.B Visual
-The \fIVisual\fP field is where you can select the X visual type that this
-demo 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.
-
-This is a combo-box, so you can either select an item from the popup menu,
-or type in a specific visual's hexadecimal ID.
+.B Lock Screen
+When this is checked, the screen will be locked when it activates.
.TP 4
-.B Demo
-This button runs the demo in full-screen mode so that you can try it out.
-Click the mouse to dismiss it.
+.B Lock Screen After
+This controls the length of the ``grace period'' between when the
+screensaver activates, and when the screen becomes locked. For
+example, if this is 5 minutes, and \fIBlank After\fP is 10 minutes,
+then after 10 minutes, the screen would blank. If there was user
+activity at 12 minutes, no password would be required to un-blank the
+screen. But, if there was user activity at 15 minutes or later (that
+is, \fILock Screen After\fP minutes after activation) then a password
+would be required. The default is 0, meaning that if locking is
+enabled, then a password will be required as soon as the screen blanks.
.TP 4
-.B Documentation
-Since each of the display modes is actually a separate program, they each
-may have their own manual. This opens a window viewing the man page of
-this program, if it has one.
-.SH SCREENSAVER OPTIONS TAB
+.B Preview
+This button, below the small preview window, runs the demo in full-screen
+mode so that you can try it out. This is the same thing that happens when
+you double-click an element in the list. Click the mouse to dismiss the
+full-screen preview.
+.TP 4
+.B Settings
+This button will pop up a dialog where you can configure settings specific
+to the display mode selected in the list.
+.SH ADVANCED TAB
This tab lets you change various settings used by the xscreensaver daemon
itself, rather than its sub-programs.
.TP 4
-.B Saver Timeout
-After the user has been idle this long, the \fIxscreensaver\fP daemon
-will blank the screen.
+.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.
.TP 4
-.B Cycle Timeout
-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
-activity.
+.B Grab Video Frames
+If your system has a video capture card, selecting this option will allow
+the image-manipulating modes to capture a frame of video to operate on.
.TP 4
-.B Verbose\
+.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.
+
+(All three of these options work by invoking the
+.BR xscreensaver\-getimage (1)
+program, which is what actually does the work.)
+.TP 4
+.B Verbose Diagnostics
Whether to print lots of debugging information.
.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.)
+.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.
+.TP 4
+.B Power Management Enabled
+Whether the monitor should be powered down after a period of inactivity.
+
+If this option is grayed out, it means your X server does not support
+the XDPMS extension, and so control over the monitor's power state is
+not available.
+
+If you're using a laptop, don't be surprised if this has no effect:
+many laptops have monitor power-saving behavior built in at a very low
+level that is invisible to Unix and X. On such systems, you can
+typically only adjust the power-saving delays by changing settings
+in the BIOS in some hardware-specific way.
+.TP 4
+.B Standby After
+If \fIPower Management Enabled\fP is selected, the monitor will go black
+after this much idle time. (Graphics demos will stop running, also.)
+.TP 4
+.B Suspend After
+If \fIPower Management Enabled\fP is selected, the monitor will go
+into power-saving mode after this much idle time. This duration should
+be greater than or equal to \fIStandby\fP.
+.TP 4
+.B Off After
+If \fIPower Management Enabled\fP is selected, the monitor will fully
+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.
+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.
.TP 4
-.B Fade Colormap
+.B Fade To Black When Blanking
If selected, then when the screensaver activates, the current contents
-of the screen will fade to black instead of simply winking out. This only
-works on displays with writable colormaps, that is, if the screen's default
-visual is a PseudoColor visual. A fade will also be done when
-switching graphics hacks (when the \fICycle Timeout\fP expires.)
+of the screen will fade to black instead of simply winking out. (Note:
+this doesn't work with all X servers.) A fade will also be done when
+switching graphics hacks (when the \fICycle After\fP expires.)
.TP 4
-.B Unfade Colormap
+.B Unfade From Black When Unblanking
The complement to \fIFade Colormap\fP: if selected, then when the screensaver
deactivates, the original contents of the screen will fade in from black
-instead of appearing immediately. This only works on displays with writable
-colormaps, and when \fIFade Colormap\fP is also selected.
+instead of appearing immediately. This is only done if \fIFade Colormap\fP
+is also selected.
.TP 4
.B Fade Duration
When fading or unfading are selected, this controls how long the fade will
take.
-.TP 4
-.B Fade Ticks
-This controls how many times a second the colormap will be changed to
-effect a fade. Higher numbers yield smoother fades, but may make the
-fades take longer than the specified number of seconds, if your server
-isn't fast enough to keep up.
-.TP 4
-.B Require Password
-Whether the screen saver should lock the screen when it activates.
-.TP 4
-.B Lock Timeout
-If \fIRequire Password\fP is selected, this controls the length of
-the ``grace period'' between when the screensaver activates, and when the
-screen becomes locked. For example, if this is 0:05:00,
-and \fISaver Timeout\fP is 0:10:00, then after 10 minutes, the screen
-would blank. If there was user activity at 12 minutes, no password
-would be required to un-blank the screen. But, if there was user activity
-at 15 minutes or later (that is, \fILock Timeout\fP minutes after
-activation) then a password would be required. The default is 0, meaning
-that if locking is enabled, then a password will be required as soon as the
-screen blanks.
-.TP 4
-.B Password Timeout
-When the screensaver is prompting for a password, the prompt dialog box will
-stay on the screen for this long before giving up, and reverting to
-screen-saving mode.
.PP
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. (OpenGL programs should always have their visual set to "GL".)
.SH COMMAND-LINE OPTIONS
.I xscreensaver\-demo
accepts the following command line options.
is managing that same display.
.TP 8
.B \-prefs
-Start up with the \fBScreensaver Options\fP tab selected by default
-instead of the \fBGraphics Demos\fP tab.
+Start up with the \fBAdvanced\fP tab selected by default
+instead of the \fBDisplay Modes\fP tab.
+.TP 8
+.B \-debug
+Causes lots of diagnostics to be printed on stderr.
.P
It is important that the \fIxscreensaver\fP and \fIxscreensaver\-demo\fP
processes be running on the same machine, or at least, on two machines
.SH SEE ALSO
.BR X (1),
.BR xscreensaver (1),
-.BR xscreensaver\-command (1)
+.BR xscreensaver\-command (1),
+.BR xscreensaver\-getimage (1)
.SH COPYRIGHT
-Copyright \(co 1992, 1993, 1997, 1998, 1999
+Copyright \(co 1992, 1993, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
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
projects / xscreensaver / blobdiff