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From: ekberg@ti-csl.csc.ti.COM
Newsgroups: comp.windows.x
Subject: Bitmap -> Pixmap operation
 > 	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
Message-ID: <9008061555.AA23896@osage.csc.ti.com>
Date: 6 Aug 90 15:55:44 GMT
References: <24310@boulder.Colorado.EDU>
Sender: ekberg@osage.csc.ti.com
Organization: The Internet
Lines: 9

An easy way to do this is to use the clip mask in the GC.  Just specify your
bitmap as the clip mask and perform the drawing operation you want.  A 0 in the
clip mask causes the corresponding pixel in the pixmap to not be modified.  If
you set the GC's foreground color to your specific value, and do the drawing
operation for the object you want (rectangle, line, etc.) the 1 pixels in the
clip mask will cause the corresponding pixels (if they are part of the object
being drawn) in the pixmap to be set to the foreground pixel.

  -- tom (aisle C-4Q), ekberg@csc.ti.com