Newsgroups: comp.windows.x
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!think.com!snorkelwacker.mit.edu!bloom-beacon!dont-send-mail-to-path-lines
From: mouse@lightning.mcrcim.mcgill.EDU (der Mouse)
Subject: Re: question on using GC Functions for levels of overlap
Message-ID: <9105050429.AA07059@lightning.McRCIM.McGill.EDU>
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Date: 5 May 91 04:29:35 GMT
Lines: 20

>>> Can anyone give me some ideas on drawing overlapping objects on the
>>> screen in such a way that the colors indicate the level of overlap
>>> (i.e. single, double, triple, ...).
>> I'd say they're not supported at all in X.  If you want the
>> equivalent of GXadd, you have to [...].
> The simplest idea is to allow up to 8 overlay planes, one per pixel
> plane.

Well yes, if you're willing to dedicate a whole bitplane to each
object, you can do anything you like with overlap.  I was assuming the
original poster wasn't satisfied with that approach; it uses up
exponential colormap space, rapidly getting entirely out of hand.

I may have been wrong in this assumption; thank you for pointing out
this tactic....

					der Mouse

			old: mcgill-vision!mouse
			new: mouse@larry.mcrcim.mcgill.edu