Path: utzoo!utgpu!attcan!uunet!husc6!mailrus!cornell!uw-beaver!fluke!ssc-vax!voodoo!bhagwan
From: bhagwan@voodoo.UUCP (The Bhagwan)
Newsgroups: comp.graphics
Subject: Re: Gray-scale antialiasing (yes, it can work)
Keywords: anti-aliasing text
Message-ID: <515@voodoo.UUCP>
Date: 2 Nov 88 14:59:05 GMT
References: <74013@sun.uucp> <148@internal.Apple.COM> <4763@mnetor.UUCP> <174@internal.Apple.COM> <19809@apple.Apple.COM>
Reply-To: bhagwan@voodoo.UUCP (The Bhagwan)
Organization: Voodoo Graphics Project
Lines: 33

In article <19809@apple.Apple.COM> jp@Apple.COM (John Peterson) writes:
>
>This is incorrect.  I would not consider BitBlt (aka CopyBits) to be an
>"intense computation."  Like all other screen fonts, anti-aliased fonts are
>pre-computed and cached.  To display them, you copy rectangles of pixels onto
>the screen.  For the vast majority of applications (page layout, word 
>processing, etc) that's all the "computation" you need to do.  
>
  True enough...but....consider subpixel positioning. You'll need additional
  bitmaps for this. If you want 1/4 pixel positioning, you need 4 bitmaps.
  No big deal, memory's cheap!

  Ref:

	"The Display of Characters Using Gray Level Sample Arrays"
	John Warnock
	1980 SIGGRAPH Proceedings

  Another reference for you:

	"Some New Ingredients for th Cookbook Approach to Anti-Aliased Text"
	Avi Naiman
	Graphics Interface 84 Proceedings

  I can remember reading about this stuff in '80 and thinking "It won't be
  long now".

Still waiting,
Al
-- 
Al McPherson		     Member Holstein Aerobatic Team
Boeing Computer Services     ...uw-beaver!ssc-vax!voodoo!bhagwan
P.O. Box 24346   MS: 6M-17   Seattle, WA  98124	   (206) 234-7723