Path: utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!usc!apple!well!oster
From: oster@well.sf.ca.us (David Phillip Oster)
Newsgroups: comp.sys.mac.programmer
Subject: Re: distort bitmaps ...
Message-ID: <22211@well.sf.ca.us>
Date: 17 Dec 90 07:03:14 GMT
References: <12279@hacgate.UUCP>
Organization: Whole Earth 'Lectronic Link, Sausalito, CA
Lines: 22

In article <12279@hacgate.UUCP> waung@rscene.hac.com (Franklin Waung) writes:
>	I have a bit map of say 80 by 100 pixels 1 bit deep (black or white),
>and I want to expand the image on the bitmap to say 120 by 150 pixels.

Copybits has this kind of distortion built in.
example:
	Rect	src, dest;

	SetRect(&src, 0, 0, 80, 100);
	SetRect(&dest, 0, 0, 120, 150);
	CopyBits(&thePort->portBits, &thePort->portBits,
		&src, &dest, srcCopy, NIL);

If you are running on a macine with color quickdraw, and you have 32-bit
color quickdraw installed either becasue it is a CI or newer, or because
you re running a new enough system or because you have the 32-bit Color
quickdraw file in your system folder, then CopyBits has a new transfer mode,
srcCopyDithered, that does much better interpolation when stretching
bitmaps, particularly gray-scale pixmaps.
-- 
-- David Phillip Oster - At least the government doesn't make death worse.
-- oster@well.sf.ca.us = {backbone}!well!oster