Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!uunet!husc6!cmcl2!rutgers!sri-spam!mordor!lll-tis!ames!sdcsvax!ucbvax!jade!thoth9.berkeley.edu!jmm
From: jmm@thoth9.berkeley.edu.BERKELEY.EDU
Newsgroups: comp.sys.mac
Subject: how to draw on an offscreen bitmap
Message-ID: <5330@jade.BERKELEY.EDU>
Date: Mon, 5-Oct-87 19:05:28 EDT
Article-I.D.: jade.5330
Posted: Mon Oct  5 19:05:28 1987
Date-Received: Thu, 8-Oct-87 06:46:21 EDT
Sender: usenet@jade.BERKELEY.EDU
Reply-To: jmm@thoth9.berkeley.edu ()
Organization: University of California, Berkeley
Lines: 43

I'm having a problem using an offscreen
bitmap.  (I'm working in LSP).

1.  Set up bitmap record, allocate enough
memory for bitmap.

2.  Open a new window.

3.  Use SetPortBits to set the new
window's bitmap to the bitmap I set up
in #1.  Save the old bitmap.

4.  Draw stuff.

5.  Reset the window's bitmap to the
original.

6.  Use CopyBits to transfer the offscreen
bitmap to the current window.

7.  This gets me zippo.

What is staring me in the face?  I've
read IM's section on Quickdraw about
seven hundred times :~)  but I can't
find anything wrong.  I reset the cliprect
to the window size every time I change
bitmaps, and absolutely nothing comes
out of the CopyBits calls.

(I know there's a Technote about this -
I'm trying to get my hands on it, but I
don't have it yet.  If someone could
send me a plain textfile, with
no Mac formatting, I'd much appreciate
it.  I have no way of getting files
from Unix to my mac.)


Thanks,

James Moore
ucbvax!leggatt!jmm