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From: gilgalad@caen.engin.umich.edu (Ralph Seguin)
Subject: NEEDED: Color "OR" operation
Distribution: na
Organization: University of Michigan Engineering, Ann Arbor
Message-ID: <1991May15.052219.26586@engin.umich.edu>
Date: Wed, 15 May 91 05:22:19 GMT

Hi.  I need the ability to specify a color dominance in graphics operations
in X.  More or less a graphics "OR" routine.  I need an efficient means
of doing this with XPutImage (I DO NOT want to copy back the pixmap section
and do the "OR" locally since that would involve multiple transfers, very
inefficient).  The situation is this:  I have a bitmap (1 plane pixmap)
locally, and I wish to place it onto a server (color or bw) and I want to
be able to specify this behavior:

source	dest	result
------	----	------
fg	fg	fg
fg	bg	fg
bg	fg	fg
bg	bg	bg

bg represents the background (or actually, any) color (index)
fg represents the foreground (or color to dominate) color (index)

As you can see, whenever either pixel is the foreground (or specified
dominant color), the result will be a foreground, ...
More or less an "OR" operation.

Is there some efficient means of implementing this?
Is there a way of mapping all pixels of a certain color within a region
to be another color (on the server)?
Is there a friendly way of allocating a color to be at indices 0 and 1
without screwing up the global color map?
Will R5 take care of this :) ?

			Thanks, Ralph

Ralph Seguin			rps@arbortext.com
536 South Forest Apt. #915	gilgalad@zip.eecs.umich.edu
Ann Arbor, MI 48104		(313) 662-4805