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From: billk@crash.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: DropShadow
Message-ID: <1073@crash.CTS.COM>
Date: Fri, 1-May-87 03:20:35 EDT
Article-I.D.: crash.1073
Posted: Fri May  1 03:20:35 1987
Date-Received: Sat, 2-May-87 14:08:03 EDT
Sender: news@crash.CTS.COM
Organization: People-Net [pnet01]
Lines: 15

> Specifically: it must add another bitplane to the Workbench screen but how
> does it do it?

It's easy to add more bitplanes to the Workbench Screen.  Just get the screen
structure pointer and index into it to get the sc_BitMap pointer.  Now just
use AllocRaster (once for each new bitplane) to allocate the extra bitplane(s)
you need.  Now stick them into the BitMap structure.  (In the WorkBench
screen, the first extra bitplane would go to sc_bitmap.bm_planes + 8)  Then
adjust the depth field so it matches the number of planes you now have in your
bitmap structure. 

I tried it -- it works fine. (I believe four bitplanes is the max for...yes.) 
The only thing you notice if you allot them and then don't do anything with
them is that window-sizings get slower.
                                                                Bill