+++ /dev/null
-.TH XScreenSaver 1 "24-Nov-97" "X Version 11"
-.SH NAME
-blitspin - rotate a bitmap in an interesting way
-.SH SYNOPSIS
-.B blitspin
-[\-display \fIhost:display.screen\fP] [\-foreground \fIcolor\fP] [\-background \fIcolor\fP] [\-window] [\-root] [\-mono] [\-install] [\-visual \fIvisual\fP] [\-bitmap \fIfilename\fP] [\-delay \fIusecs\fP] [\-delay2 \fIusecs\fP]
-.SH DESCRIPTION
-The \fIblitspin\fP program repeatedly rotates a bitmap by 90 degrees by
-using logical operations: the bitmap is divided into quadrants, and the
-quadrants are shifted clockwise. Then the same thing is done again with
-progressively smaller quadrants, except that all sub-quadrants of a
-given size are rotated in parallel. So this takes \fBO(16*log2(N))\fP
-blits of size NxN, with the limitation that the image must be square,
-and the size must be a power of 2.
-.SH OPTIONS
-.I blitspin
-accepts the following options:
-.TP 8
-.B \-window
-Draw on a newly-created window. This is the default.
-.TP 8
-.B \-root
-Draw on the root window.
-.TP 8
-.B \-mono
-If on a color display, pretend we're on a monochrome display.
-.TP 8
-.B \-install
-Install a private colormap for the window.
-.TP 8
-.B \-visual \fIvisual\fP
-Specify which visual to use. Legal values are the name of a visual class,
-or the id number (decimal or hex) of a specific visual.
-.TP 8
-.B \-bitmap \fIfilename\fP
-The file name of a bitmap to rotate. It need not be square: it
-will be padded with the background color. If unspecified or the
-string \fI(default)\fP, a builtin bitmap is used.
-
-If support for the \fIXPM\fP library was enabled at compile-time,
-the specified file may be in \fIXPM\fP format as well as \fIXBM\fP, and
-thus may be a color image.
-
-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 \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 \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
-stored in the RESOURCE_MANAGER property.
-.SH SEE ALSO
-.BR X (1),
-.BR xscreensaver (1)
-.SH COPYRIGHT
-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@jwz.org>, 17-aug-92.
-
-Based on SmallTalk code which appeared in the August 1981 issue of Byte
-magazine.
projects / xscreensaver / blobdiff