blitspin man page on aLinux
blitspin(6) XScreenSaver manual blitspin(6)
blitspin - rotate a bitmap in an interesting way
blitspin [-display host:display.screen] [-foreground color] [-back‐
ground color] [-window] [-root] [-mono] [-install] [-visual visual]
[-bitmap filename] [-delay usecs] [-delay2 usecs] [-duration secs]
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.
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.
Specify which visual to use. Legal values are the name of a
visual class, or the id number (decimal or hex) of a specific
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.
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.
How long to delay between steps of the rotation process, in
microseconds. Default is 500000, one-half second.
How long to run before loading a new image. Default 120 sec‐
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.
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 © 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
Jamie Zawinski <firstname.lastname@example.org>, 17-aug-92.
Based on SmallTalk code which appeared in the August 1981 issue of Byte
X Version 11 5.07 (10-Aug-2008) blitspin(6)
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