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-XScreenSaver(1) XScreenSaver(1)
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-N\bNA\bAM\bME\bE
- blitspin - rotate a bitmap in an interesting way
-
-S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS
- b\bbl\bli\bit\bts\bsp\bpi\bin\bn [-display _\bh_\bo_\bs_\bt_\b:_\bd_\bi_\bs_\bp_\bl_\ba_\by_\b._\bs_\bc_\br_\be_\be_\bn] [-foreground
- _\bc_\bo_\bl_\bo_\br] [-background _\bc_\bo_\bl_\bo_\br] [-window] [-root] [-mono]
- [-install] [-visual _\bv_\bi_\bs_\bu_\ba_\bl] [-bitmap _\bf_\bi_\bl_\be_\bn_\ba_\bm_\be] [-delay
- _\bu_\bs_\be_\bc_\bs] [-delay2 _\bu_\bs_\be_\bc_\bs]
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-D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN
- The _\bb_\bl_\bi_\bt_\bs_\bp_\bi_\bn 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\bO(\b(1\b16\b6*\b*l\blo\bog\bg2\b2(\b(N\bN)\b))\b) blits of size NxN, with the limitation that
- the image must be square, and the size must be a power of
- 2.
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-O\bOP\bPT\bTI\bIO\bON\bNS\bS
- _\bb_\bl_\bi_\bt_\bs_\bp_\bi_\bn accepts the following options:
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- -\b-w\bwi\bin\bnd\bdo\bow\bw Draw on a newly-created window. This is the
- default.
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- -\b-r\bro\boo\bot\bt Draw on the root window.
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- -\b-m\bmo\bon\bno\bo If on a color display, pretend we're on a
- monochrome display.
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- -\b-i\bin\bns\bst\bta\bal\bll\bl
- Install a private colormap for the window.
-
- -\b-v\bvi\bis\bsu\bua\bal\bl _\bv_\bi_\bs_\bu_\ba_\bl
- 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.
-
- -\b-b\bbi\bit\btm\bma\bap\bp _\bf_\bi_\bl_\be_\bn_\ba_\bm_\be
- 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 _\b(_\bd_\be_\bf_\ba_\bu_\bl_\bt_\b), a
- builtin bitmap is used.
-
- If support for the _\bX_\bP_\bM library was enabled at com-
- pile-time, the specified file may be in _\bX_\bP_\bM format
- as well as _\bX_\bB_\bM, and thus may be a color image.
-
- The *\b*b\bbi\bit\btm\bma\bap\bpF\bFi\bil\ble\beP\bPa\bat\bth\bh resource will be searched if
- the bitmap name is not a fully-qualified pathname.
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- -\b-g\bgr\bra\bab\bb-\b-s\bsc\bcr\bre\bee\ben\bn
- If this option is specified, then the image which
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-XScreenSaver(1) XScreenSaver(1)
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- is spun will be grabbed from the portion of the
- screen underlying the blitspin window. (Or, it
- may come from an external video source: see
- below.)
-
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- -\b-d\bde\bel\bla\bay\by _\bm_\bi_\bc_\br_\bo_\bs_\be_\bc_\bo_\bn_\bd_\bs
- How long to delay between steps of the rotation
- process, in microseconds. Default is 500000, one-
- half second.
-
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- -\b-d\bde\bel\bla\bay\by2\b2 _\bm_\bi_\bc_\br_\bo_\bs_\be_\bc_\bo_\bn_\bd_\bs
- How long to delay between each 90-degree rotation,
- in microseconds. Default is 500000, one-half sec-
- ond. D\bDI\bIS\bSP\bPL\bLA\bAY\bY to get the default host and display
- number.
-
-R\bRE\bES\bSO\bOU\bUR\bRC\bCE\bES\bS
- 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.
-
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- g\bgr\bra\bab\bbV\bVi\bid\bde\beo\boP\bPr\bro\bob\bba\bab\bbi\bil\bli\bit\bty\by (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.
-
- v\bvi\bid\bde\beo\boD\bDe\bev\bvi\bic\bce\be (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 g\bgr\bra\bab\bbV\bVi\bid\bde\beo\boP\bPr\bro\bob\bba\bab\bbi\bil\bli\bit\bty\by to 0.0.)
-
- v\bvi\bid\bde\beo\boG\bGa\bai\bin\bn (Float)
- The amount by which to brighten the grabbed image.
- This defaults to 2.2.
-
-E\bEN\bNV\bVI\bIR\bRO\bON\bNM\bME\bEN\bNT\bT
- X\bXE\bEN\bNV\bVI\bIR\bRO\bON\bNM\bME\bEN\bNT\bT to get the name of a resource file that over-
- rides the global resources stored in the RESOURCE_MANAGER
- property.
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-XScreenSaver(1) XScreenSaver(1)
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-S\bSE\bEE\bE A\bAL\bLS\bSO\bO
- X\bX(1), x\bxs\bsc\bcr\bre\bee\ben\bns\bsa\bav\bve\ber\br(1)
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-C\bCO\bOP\bPY\bYR\bRI\bIG\bGH\bHT\bT
- Copyright (C) 1992, 1993, 1997 by Jamie Zawinski. Permis-
- sion to use, copy, modify, distribute, and sell this soft-
- ware 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 pro-
- vided "as is" without express or implied warranty.
-
-A\bAU\bUT\bTH\bHO\bOR\bR
- Jamie Zawinski <jwz@jwz.org>, 17-aug-92.
-
- Based on SmallTalk code which appeared in the August 1981
- issue of Byte magazine.
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projects / xscreensaver / blobdiff