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From: discolo@cookie.dec.com (Anthony D. CXO1-2/N23 522-2072)
Newsgroups: net.micro.mac
Subject: Changing a grafPort's portBits?
Message-ID: <6166@decwrl.DEC.COM>
Date: Thu, 30-Oct-86 16:38:22 EST
Article-I.D.: decwrl.6166
Posted: Thu Oct 30 16:38:22 1986
Date-Received: Sat, 1-Nov-86 04:37:39 EST
Sender: daemon@decwrl.DEC.COM
Organization: Digital Equipment Corporation
Lines: 36

Does anyone know how to change the size of a grafPort's portBits
bitmap?  I am manipulating a 512x512 pixel image and need to increase
the size of portBits^.baseAddr from 314(?)x512 to 512x512 (also
changing portBits^.bounds to (0, 0, 512, 512), but that should be
easy: use SetRect).

There are a few of problems I'm having:

	(1) Whenever I use portBits^.baseAddr, I get an odd address
	    exception.  I'm using Lightspeed Pascal.

	(2) I don't know whether portBits^.baseAddr points to a
	    relocatable or non-relocatable block.  Do I use
	    RestoreHandle to get a handle from it, and then use
	    SetHandleSize, or do I use SetPtrSize?

	(3) When I create a brand new bitmap and assign it to portBits,
	    the  window toolbox routines get very confused
	    (i.e. the window changes to a different size,
	    no mouse-down events in the window work, etc.)
	   
Any help would be greatly appreciated.

Anthony

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Anthony Discolo
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Database Systems Group
301 Rockrimmon Blvd. South
Mailstop CX01-2/N23
Colorado Springs, CO  80919
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