--- /dev/null
+.TH XScreenSaver 1 "17-aug-92" "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] [\-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 \-bitmap bitmap-name
+The bitmap to rotate. It need not be square: it will be padded with
+the background color. Default is \fIxlogo64\fP, but \fIescherknot\fP
+is also nice. You really need to run this on a bigger bitmap than
+those shipped with the X distribution to do it justice.
+
+The \fB*bitmapFilePath\fP resource will be searched if the bitmap name
+is not a fully-qualified pathname.
+.SH ENVIRONMENT
+.PP
+.TP 8
+.B \-delay microseconds
+How long to delay between steps of the rotation process, in microseconds.
+Default is 500000, one-half second.
+.PP
+.TP 8
+.B \-delay2 microseconds
+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 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 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@lucid.com>, 17-aug-92.
+
+Based on SmallTalk code which appeared in the August 1981 issue of Byte
+magazine.
projects / xscreensaver / blobdiff