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From: russotto@eng.umd.edu (Matthew T. Russotto)
Newsgroups: comp.sys.mac.programmer
Subject: Quickdraw bug
Message-ID: <1990Jul4.023022.10833@eng.umd.edu>
Date: 4 Jul 90 02:30:22 GMT
Sender: news@eng.umd.edu (The News System)
Organization: College of Engineering, Maryversity of Uniland, College Park
Lines: 23

OK, here goes.  I tried to post this once before, but it didn't seem to make
it.  Basically the problem occurs with long, thin, single bit bitmaps.
      	tmpport = NewPtr((long)sizeof(GrafPort));
      	OpenPort(tmpport);
      	bm.baseAddr = NewPtr(0xC000L/8L);
      	bm.rowBytes = (short)(0xC000L/8L);
      	bm.bounds.left = -24576;
      	bm.bounds.top = 0;
    	bm.bounds.right = 0x6000;
    	bm.bounds.bottom = 1;
    	SetPortBits(&bm);
	BlockMove(&bm.bounds, &tmpport->portRect, (long)sizeof(Rect));
	RectRgn(tmpport->visRgn, &bm.bounds);
	ClipRect(&bm.bounds);
    	EraseRect(&bm.bounds);
		^^^^^^^^ hangs here, at the eraserect.
Also, any drawing past pen location 0x2000 (the 0x8000th bit in the image,
not coincidentally, I am sure) has no effect.
Sure, this is a horrible abuse of Quickdraw, but QD should perform up to spec.
--
Matthew T. Russotto	russotto@eng.umd.edu	russotto@wam.umd.edu
][, ][+, ///, ///+, //e, //c, IIGS, //c+ --- Any questions?
		Hey!  Bush has NO LIPS!