X-Git-Url: http://git.hungrycats.org/cgi-bin/gitweb.cgi?p=xscreensaver;a=blobdiff_plain;f=hacks%2Fconfig%2Fblitspin.xml;h=022515ff0c7a361f43f2b8e80e9829713289798c;hp=d7e73b2ea6d5ee1e7e554af0d6dba5c6d6ca325d;hb=019de959b265701cd0c3fccbb61f2b69f06bf9ee;hpb=8eb2873d7054e705c4e83f22d18c40946a9e2529 diff --git a/hacks/config/blitspin.xml b/hacks/config/blitspin.xml index d7e73b2e..022515ff 100644 --- a/hacks/config/blitspin.xml +++ b/hacks/config/blitspin.xml @@ -4,32 +4,41 @@ - +
+ + + + + + + + + + + + + +
+ + - - - + <_description> - +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. - <_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. +Written by Jamie Zawinski; 1992.