offscreen bm routines?

["Douglas E. Roesch" <dr3f+@andrew.cmu.edu>]

Has anyone written any offscreen bitmap routines that work under 2.0? 
(GWorlds or Principia style, I don't care.  1-bit deep is sufficient.) 
The ones I wrote for 1.3.2 don't work after a straightforward
translation, and I don't wish to put any more time into the conversion
unless I have to.

Thanks in advance,

Doug