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XScreenSaver(1) 								  XScreenSaver(1)

       blitspin - rotate a bitmap in an interesting way

       blitspin  [-display host:display.screen] [-foreground color] [-background color] [-window]
       [-root] [-mono] [-install] [-visual visual] [-bitmap  filename]	[-delay  usecs]  [-delay2

       The  blitspin  program  repeatedly  rotates a bitmap by 90 degrees by using logical opera-
       tions: 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 O(16*log2(N))  blits
       of  size  NxN,  with  the limitation that the image must be square, and the size must be a
       power of 2.

       blitspin accepts the following options:

       -window Draw on a newly-created window.	This is the default.

       -root   Draw on the root window.

       -mono   If on a color display, pretend we're on a monochrome display.

	       Install a private colormap for the window.

       -visual visual
	       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.

       -bitmap filename
	       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 (default), a builtin bit-
	       map is used.

	       If support for the XPM library was enabled at compile-time, the specified file may
	       be in XPM format as well as XBM, and thus may be a color image.

	       The *bitmapFilePath resource will be searched if the bitmap name is not	a  fully-
	       qualified pathname.

	       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 grabDesktopImages, grab-
	       VideoFrames, and chooseRandomImages  options  in  the  ~/.xscreensaver  file;  see
	       xscreensaver-demo(1) for more details.

       -delay microseconds
	       How long to delay between steps of the rotation process, in microseconds.  Default
	       is 500000, one-half second.

       -delay2 microseconds
	       How long to delay between each 90-degree rotation, in  microseconds.   Default  is
	       500000, one-half second.  DISPLAY to get the default host and display number.

       XENVIRONMENT to get the name of a resource file that overrides the global resources stored
       in the RESOURCE_MANAGER property.

       X(1), xscreensaver(1), xscreensaver-demo(1), xscreensaver-getimage(1)

       Copyright (C) 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.

       Jamie Zawinski <jwz@jwz.org>, 17-aug-92.

       Based on SmallTalk code which appeared in the August 1981 issue of Byte magazine.

X Version 11				    24-Nov-97				  XScreenSaver(1)
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