Path: utzoo!attcan!uunet!wyse!vsi1!ubvax!ames!umd5!cvl!avjewe From: avjewe@cvl.umd.edu (Andrew Donaldson Jewell) Newsgroups: comp.sys.mac.programmer Subject: bitmap -> region Message-ID: <2960@cvl.umd.edu> Date: 30 Jun 88 19:43:35 GMT Organization: Center for Automation Research, Univ. of Md. Lines: 19 I feel silly responding to my own message, but I just stumbled over Tech Note #193 : There is a routine which you can license from Apple NOW and will be in QuickDraw SOON. FUNCTION BitMapRgn(region : RgnHandle; bMap : BitMap) : OSErr; or pascal OSErr BitMapRgn(RgnHandle region, BitMap bMap); Does exactly what I wanted, i.e. all the 1's are inside the region and all the 0's are not. Andy Jewell avjewe@cvl.umd.edu PS It might be the case that licensible version will only work with MPW.