From d3a98cf6cbc3bd0b9efc570f58e8812c03931c18 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Tue, 16 Oct 2018 10:08:48 +0200
Subject: Original 5.40

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+.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] [\-duration \fIsecs\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 from
+the system's video input, or from a random file on disk, as indicated by
+the \fIgrabDesktopImages\fP, \fIgrabVideoFrames\fP, 
+and \fIchooseRandomImages\fP options in the \fI~/.xscreensaver\fP file;
+see
+.BR xscreensaver-demo (1)
+for more details.
+.TP 8
+.B \-delay \fImicroseconds\fP
+How long to delay between steps of the rotation process, in microseconds.
+Default is 500000, one-half second.
+.TP 8
+.B \-duration \fIseconds\fP
+How long to run before loading a new image.  Default 120 seconds.
+.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.
+.TP 8
+.B \-fps
+Display the current frame rate and CPU load.
+.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),
+.BR xscreensaver-demo (1),
+.BR xscreensaver-getimage (1)
+.SH COPYRIGHT
+Copyright \(co 1992, 1993, 1997, 2001 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.
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