X-Git-Url: http://git.hungrycats.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=hacks%2Fconfig%2Fblitspin.xml;h=0d838864f066ca717580f49c71749be0af82a3df;hb=de460e831dc8578acfa8b72251ab9346c99c1f96;hp=fe086d4510deacb5509bdeb4fd28fabaad19cd81;hpb=13dbc569cdc6e29019722c0ef9b932a925efbcad;p=xscreensaver diff --git a/hacks/config/blitspin.xml b/hacks/config/blitspin.xml index fe086d45..0d838864 100644 --- a/hacks/config/blitspin.xml +++ b/hacks/config/blitspin.xml @@ -14,22 +14,23 @@ low="1" high="800000" default="500000" convert="invert"/> - + - + + + <_description> -The ``blitspin'' hack 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. Written by -Jamie Zawinski based on some cool SmallTalk code seen in in Byte -Magazine in 1981. - -As you watch it, the image appears to dissolve into static and then -reconstitute itself, but rotated. You can provide the image to use, -as an XBM or XPM file, or tell it to grab a screen image and rotate -that. + +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. As you watch it, the image appears to dissolve +into static and then reconstitute itself, but rotated. + +Written by Jamie Zawinski; 1992.