Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!apple!claris!UUCP!peirce
From: peirce@outpost.UUCP (Michael Peirce)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Rgns from icons
Message-ID: <0B01FFFB.gnw2y0@outpost.UUCP>
Date: 27 May 91 23:51:53 GMT
Reply-To: peirce@outpost.UUCP (Michael Peirce)
Organization: Peirce Software
Lines: 27
X-Mailer: uAccess - Mac Release: 1.1.b3


In article <1991May27.132246.17040@murdoch.acc.Virginia.EDU>, heddle@clas01.cebaf.gov (David Heddle) writes:
> Dear friends:
> 
> Does anyone have code for generating a rgn from an icon (bw and color).
> I guess one uses the icon mask, but I don't know how to convert a 
> bit map into a region. Presumably this is also how the lasso works
> in a bit map painting program.

The following is a code fragment from some of my own code.  It uses
BitMapToRegion to convert the mask of a CICN into a region.  You used
to have to license this routine for some reason, but I *think* it's
built into System 7.


    oldSpotRgn := NewRgn;
    FailNIL(oldSpotRgn);
	
    HLock(Handle(fCICN));
    WITH fCICN^^ DO BEGIN
        iconBMap.baseAddr := @iconMaskData;
        FailOSErr(BitMapToRegionhccc(oldSpotRgn,iconBMap));

--  Michael Peirce         --   outpost!peirce@claris.com
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