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From: bobl@tessi.UUCP (Bob Lewis)
Newsgroups: comp.sys.amiga
Subject: need help on "shrinking" blt
Message-ID: <381@ghidrah.tessi.UUCP>
Date: Mon, 27-Apr-87 20:08:22 EDT
Article-I.D.: ghidrah.381
Posted: Mon Apr 27 20:08:22 1987
Date-Received: Thu, 30-Apr-87 04:19:31 EDT
Reply-To: bobl@tessi.UUCP (Bob Lewis)
Distribution: world
Organization: TSSI, Beaverton, Oregon
Lines: 15

I'm something of an Amiga novice and I have an application that would
benefit from my being able to "shrink" a bitmap to show an object receding
on the screen.  I need to be able to shrink an N x N bitmap to any arbitrary
size M x M where M < N.

I notice that Deluxe Paint allows you to do this to a brush, but I need to do
it on the fly from a C or BASIC program, and none of the documentation I've
consulted covers it.  There's probably some algorithm that would do it fairly
efficiently, but perhaps I don't need to reinvent the wheel.  Does anybody
know how DP does it?  Am I missing an obscure ROM call?

Please reply by email.  I will summarize if requested.  Thanks in advance.

	- Bob Lewis
	  ...!tektronix!tessi!bobl