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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] [--window-id number] [--mono] [--in- stall] [--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. --window-id number Draw on the specified 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-settings(1) for more details. --delay microseconds How long to delay between steps of the rotation process, in mi- croseconds. 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. XSCREENSAVER_WINDOW The window ID to use with --root. SEE ALSO X(1), xscreensaver(1), xscreensaver-settings(1), xscreensaver-getim- age(6) COPYRIGHT Copyright (C) 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 im- plied 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 6.09 (07-Jun-2024) blitspin(6)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | ENVIRONMENT | SEE ALSO | COPYRIGHT | AUTHOR
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