cache-image-snip.ss: Cache-image Snip
To load: (require (lib "cache-image-snip.ss" "mrlib"))
This library is the core data structure for the image.ss
teachpack. Images in the image.ss library are instances of
the cache-image-snip% class.
The library also defines a new type, argb, that represents a
bitmap, but with alpha values. It has a maker, two selectors, and a
predicate.