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From: todd@GRANITE.DEC.COM (Todd Newman)
Newsgroups: comp.windows.x
Subject: Colormaps for StaticColor visuals
Message-ID: <8711042337.AA01754@granite.DEC.COM>
Date: Wed, 4-Nov-87 18:37:33 EST
Article-I.D.: granite.8711042337.AA01754
Posted: Wed Nov  4 18:37:33 1987
Date-Received: Mon, 9-Nov-87 03:37:56 EST
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 41

This is in reply to Michael Toy's mail.  (It would be nice if the return
address given is one I can actually use instead of one that will work
"Someday.")

I'm having trouble believing what you've said.  You said:

    PortingLayer doc suggests checking the BeingCreated bit in the ddx 
    CreateColormap routine and if it is set, calling AllocColor for
    each pixel.

    This doesn't work.  AllocColors calss Find<mumble> which just returns if
    your visualtype is StaticColor.

It's hard for me to believe that FindColor just returns.  You've actually
run this and had it fail?  I'm puzzled because I double-checked the source
code and can't see why it should.
AllocColor will diddle with its concept of the class so that if the server is
creating the colormap, and the BeingCreated flag is set, the class becomes
Dynamic.

That means that it will ALWAYS call FindColor when you're creating a colormap.

Three points about FindColor:
Firstly, FindColor never checks whether the colormap is static or not.
There simply isn't such a test.

Secondly, all you have to do is AllocColor with *pPix (the 5th argument)
set to 0.  When it calls FindColor, FindColor will start looking at the
0th map entry and keep searching till it finds an empty one.  That is 
going to be the next free one.  Just keep making the same call to AllocColor
and it should return successive pixels into which you load your ramping
color values.

Finally, if you think about it right, you'll see that that's how the
qvCreateColormap code works.  The monochrome colormap is static.  And I
call it twice and get back two different pixels.

I know it seems a lot to ask, but please trace through the FindColor
and see why it's giving up.  I just can't believe it's because the
class is static.
	/tdn