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From: gft_james@gsbacd.uchicago.edu
Newsgroups: comp.sys.mac.programmer
Subject: CalcMask
Message-ID: <1990Aug31.154627.14859@midway.uchicago.edu>
Date: 31 Aug 90 15:42:50 GMT
Sender: news@midway.uchicago.edu (News Administrator)
Organization: University of Chicago Graduate School of Business
Lines: 19

I need to generate masks for a whole pile o' bitmaps, and I don't want to do it
manually.  My "Inside Mac" DA lists a routine:

PROCEDURE CalcMask (srcPtr,dstPtr: Ptr; srcRow, dstRow, height,
                    words: INTEGER);

    Given a source bit image, CalcMask computes a destination bit image
with 1's only in the pixels where paint could not leak from any of
the outer edges, like the MacPaint lasso tool. Calls to CalcMask are
not clipped to the current port and are not stored into QuickDraw
pictures.

This sounds like exactly what I need, but I can't for the life of me figger out
what the arguments should be, and I can't find any reference to this routine in
Inside Mac I, II, II, or V.  I don't have IV.  V has documentation for CalcCMask
(apparently the color version of this routine), but the argument set is totally
different, and I want to work in B&W.  Can someone help me out?  Thanks in
advance.
  -James-