-.TH XScreenSaver 1 "17-aug-92" "X Version 11"
+.TH XScreenSaver 1 "24-Nov-97" "X Version 11"
.SH NAME
blitspin - rotate a bitmap in an interesting way
.SH SYNOPSIS
The \fB*bitmapFilePath\fP resource will be searched if the bitmap
name is not a fully-qualified pathname.
+.TP 8
+.B \-grab\-screen
+If this option is specified, then the image which is spun will be grabbed
+from the portion of the screen underlying the blitspin window. (Or, it
+may come from an external video source: see below.)
.PP
.TP 8
-.B \-delay microseconds
+.B \-delay \fImicroseconds\fP
How long to delay between steps of the rotation process, in microseconds.
Default is 500000, one-half second.
.PP
.TP 8
-.B \-delay2 microseconds
+.B \-delay2 \fImicroseconds\fP
How long to delay between each 90-degree rotation, in microseconds.
Default is 500000, one-half second.
.B DISPLAY
to get the default host and display number.
+.SH RESOURCES
+On some systems (currently, only SGIs), this program can, instead of grabbing
+a desktop image, grab a frame of video from an external camera and manipulate
+that instead. The following resources control that.
+.PP
+.TP 8
+.B grabVideoProbability \fR(Float)\fP
+What portion of the time to grab video rather than a screen image,
+between 0.0 and 1.0. Defaults to 0.5, or half the time.
+.TP 8
+.B videoDevice \fR(Integer)\fP
+The number of the default video input device to check first. If unspecified,
+the default camera (from videopanel(1)) will be checked first. After that, all
+other available video input devices will be checked in order.
+
+The first one which produces a non-black image will be used. If all images
+are black, the others will be re-checked a few times before giving up and
+falling back to simply grabbing a desktop image (but note that this takes a
+few seconds, so if you don't actually have any video sources hooked up, you
+should consider turning off video grabbing by setting
+\fBgrabVideoProbability\fP to 0.0.)
+.TP 8
+.B videoGain \fR(Float)\fP
+The amount by which to brighten the grabbed image. This defaults to 2.2.
.SH ENVIRONMENT
.B XENVIRONMENT
to get the name of a resource file that overrides the global resources
.BR X (1),
.BR xscreensaver (1)
.SH COPYRIGHT
-Copyright \(co 1992, 1993 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, 1993, 1997 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@netscape.com>, 17-aug-92.
+Jamie Zawinski <jwz@jwz.org>, 17-aug-92.
Based on SmallTalk code which appeared in the August 1981 issue of Byte
magazine.
projects / xscreensaver / blobdiff