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From: wysocki@husc9.harvard.edu (Christopher Wysocki)
Newsgroups: comp.sys.mac.programmer
Subject: Re: How do I call on assembly from C?
Keywords: QuickDraw BitMapToRegion inline function C
Message-ID: <1991Jun4.220903.1314@husc3.harvard.edu>
Date: 5 Jun 91 02:09:02 GMT
Article-I.D.: husc3.1991Jun4.220903.1314
References: <1991Jun4.190036.15349@cs.yale.edu>
Organization: Harvard University, Cambridge, MA
Lines: 31
Nntp-Posting-Host: husc9.harvard.edu

In article <1991Jun4.190036.15349@cs.yale.edu> pittenger-laurence@cs.yale.edu
(Laurence Arthur Pittenger) writes:

>A few days back someone posted about converting Bitmaps to regions.
>There's a call at assembly location 0xA8D7 which takes (RgnHandle
>theRgn, BitMap* theMap) as parameters to do this.
>
>Well, I'm running Think C and it doesn't have this call.  But I
>figured I could just call on the command directly, since I know its
>address.  But I can't figure out how to do it.
>
>I tried CallPascal (theRgn, theMap, 0xA8D7) but was criticized by the
>debugger for an "odd address".  I also tried making a function type of
>the appropriate nature and assigning BitmapToRgn = (functype) 0xA8D7,
>but it didn't like BitmapToRgn (theRgn, theMap) either.
>
>So how do I do it?

Try declaring the function BitMapToRegion as:

	pascal OSErr BitMapToRegion(RgnHandle region, BitMap *bMap)
	    = 0xA8D7; 

and then just say:

	BitMapToRegion(theRgn, theMap);

Hope this helps.

Chris Wysocki
wysocki@husc9.harvard.edu