Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!bionet!ames!lll-winken!arisia!sgi!shinobu!odin!fudge!karlton
From: karlton@fudge.sgi.com (Phil Karlton)
Newsgroups: comp.windows.x
Subject: Re: How does the X protocol deal with colors ?
Message-ID: <252@odin.SGI.COM>
Date: 26 Jul 89 21:29:18 GMT
References: <8907261545.AA28766@expo.lcs.mit.edu>
Sender: news@odin.SGI.COM
Organization: Silicon Graphics, Inc., Mountain View, CA
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In article <8907261545.AA28766@expo.lcs.mit.edu> TRANLE@INTELLICORP.COM (Minh Tran-Le) writes:
>When you have 2 colors: color1 and color2 on 2 pixmaps and you are doing
>a copyarea with a specific logical op (something more complex than just
>the GxCopy).
>Does it use the 2 colormap entries (pixel value) or does it use the rgb
>values to do the logical combination ?

From Page 400 of the Digital Press "X Window System" book

    In graphics operations, given a source and estination pixel, the
    result is computed bitwise on the corresponding bits of the pixels:
    that is, a Boolean operation is performated in each bit plane.

PK
Phil Karlton			karlton@sgi.com
				415-964-1459 ext. 3018