Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!decwrl!sgi!shinobu!odin!sgi.com!karlton
From: karlton@sgi.com (Phil Karlton)
Newsgroups: comp.windows.x
Subject: Re: Bitmap -> Pixmap operation
Keywords: weird operation?
Message-ID: <11466@odin.corp.sgi.com>
Date: 6 Aug 90 21:32:09 GMT
References: <24310@boulder.Colorado.EDU>
Sender: news@odin.corp.sgi.com
Reply-To: karlton@sgi.com
Organization: Silicon Graphics, System Software Division
Lines: 21

In article <24310@boulder.Colorado.EDU>, devin@pippin.Colorado.EDU
(Yampalimardilor) writes:
|> 	I have a Bitmap (single plane Pixmap) and an eight plane Pixmap.
|> I want to stamp the Bitmap onto the Pixmap so that any off locations in
|> the Bitmap don't change the Pixmap and any on locations in the Bitmap
|> set that location in the Pixmap to a specific value (i.e. 254).  Is there
|> an easy X way to do this?  Thanks.

You can do CopyPlane twice changing the GC between the two calls.
Assuming a depth 8 destination visual, the following should work.

	GC function	foreground	background

	And		254		255
	Or		254		0

Other combinations of functions and background/foreground will also
work. The efficiency of any of the choices will depend upon the
particular server you are using.

PK