blitspin man page on Tru64

Man page or keyword search:  
man Server   12896 pages
apropos Keyword Search (all sections)
Output format
Tru64 logo
[printable version]

XScreenSaver(1)						       XScreenSaver(1)

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]

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, it may come from an external	video  source:
	       see below.)

       -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 microsec‐
	       onds.   Default is 500000, one-half second.  DISPLAY to get the
	       default host and display number.

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.

       grabVideoProbability (Float)
	       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.

       videoDevice (Integer)
	       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 grabVideoProba‐
	       bility to 0.0.)

       videoGain (Float)
	       The amount by  which  to	 brighten  the	grabbed	 image.	  This
	       defaults to 2.2.

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)

COPYRIGHT
       Copyright © 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  war‐
       ranty.

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			   24-Nov-97		       XScreenSaver(1)
[top]
                             _         _         _ 
                            | |       | |       | |     
                            | |       | |       | |     
                         __ | | __ __ | | __ __ | | __  
                         \ \| |/ / \ \| |/ / \ \| |/ /  
                          \ \ / /   \ \ / /   \ \ / /   
                           \   /     \   /     \   /    
                            \_/       \_/       \_/ 
More information is available in HTML format for server Tru64

List of man pages available for Tru64

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net