[comp.sys.amiga] need help on "shrinking" blt

bobl@tessi.UUCP (Bob Lewis) (04/28/87)

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