CachedImageRep can do slow caching, using ximages, and fast
caching using pixmaps. The distinction is to please memory restricted
X servers.
redefine void load tom.Array arguments;
tag.ImageRep class.
instance (id)
withBitmapImageRep tag.BitmapImageRep rep
onScreen Screen screen;
public Screen screen;
Screen on which we are `locked'.
boolean drawAtPoint (float, float) (x, y);