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From: lsr@Apple.COM (Larry Rosenstein)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Access to hardware framebuffer (Color QD)
Message-ID: <9888@goofy.Apple.COM>
Date: 22 Aug 90 18:46:14 GMT
References: <1990Aug21.182827.19315@nada.kth.se> <9880@goofy.Apple.COM> <1990Aug22.110820.8154@nada.kth.se>
Distribution: comp
Organization: Apple Computer, Inc.
Lines: 17

In article <1990Aug22.110820.8154@nada.kth.se> d88-jwa@dront.nada.kth.se (Jon W{tte) writes:
>
>Well, he wanted to xor the INDICIES, not the colors. Like, say 0 == blue,
>and 1 == red, and 2 == black and 3 == green:
>
>DrawInColor(1); /* Gives a red drawing */
>XORWith(2) /* Makes the red pixels green, and the blue black */

You can do this with Color QuickDraw.  Simply make a pix pat (using
MakeRGBPat) that is pure black, and use patXOR mode.  It will XOR the pixel
values (indices).

-- 
		 Larry Rosenstein,  Object Specialist
 Apple Computer, Inc.  20525 Mariani Ave, MS 46-B  Cupertino, CA 95014
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