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XScreenSaver !!!XScreenSaver NAME SYNOPSIS DESCRIPTION OPTIONS ENVIRONMENT SEE ALSO COPYRIGHT AUTHOR ---- !!NAME blitspin - rotate a bitmap in an interesting way !!SYNOPSIS __blitspin__ [[-display ''host:display.screen''] [[-foreground ''color''] [[-background ''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 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. !!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 blitspin window, or from the system's video input, or from a random file on disk, as indicated by the ''grabDesktopImages'', ''grabVideoFrames'', 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. !!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 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 !!AUTHOR Jamie Zawinski Based on !SmallTalk code which appeared in the August 1981 issue of Byte magazine. ----
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blitspin(1)
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