blitspin man page on aLinux

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blitspin(6)		      XScreenSaver manual		   blitspin(6)

NAME
       blitspin - rotate a bitmap in an interesting way

SYNOPSIS
       blitspin	 [-display  host:display.screen]  [-foreground	color] [-back‐
       ground color] [-window] [-root]	[-mono]	 [-install]  [-visual  visual]
       [-bitmap filename] [-delay usecs] [-delay2 usecs] [-duration secs]

DESCRIPTION
       The blitspin program repeatedly rotates a bitmap by 90 degrees by using
       logical operations: the bitmap is divided into quadrants, and the quad‐
       rants  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.

OPTIONS
       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
	       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 bitmap 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.

       -grab-screen
	       If this option is specified, then the image which is spun  will
	       be  grabbed from the portion of the screen underlying the blit‐
	       spin window, or from the system's video input, or from a random
	       file  on disk, as indicated by the grabDesktopImages, grabVide‐
	       oFrames, 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.

       -duration seconds
	       How long to run before loading a new image.  Default  120  sec‐
	       onds.

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

       -fps    Display the current frame rate and CPU load.

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

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

COPYRIGHT
       Copyright © 1992, 1993, 1997, 2001 by Jamie  Zawinski.	Permission  to
       use,  copy, modify, distribute, and sell this software and its documen‐
       tation for any purpose is hereby granted without fee, provided that the
       above  copyright	 notice	 appear in all copies and that both that copy‐
       right notice and this permission notice appear in supporting documenta‐
       tion.   No representations are made about the suitability of this soft‐
       ware for any purpose.  It  is  provided	"as  is"  without  express  or
       implied warranty.

AUTHOR
       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		      5.07 (10-Aug-2008)		   blitspin(6)
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