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From: courtney@arirang.cps.msu.edu (Jonathan Courtney)
Newsgroups: comp.windows.open-look
Subject: xview colormap segments
Message-ID: <1991Apr1.195641.14615@msuinfo.cl.msu.edu>
Date: 1 Apr 91 19:56:41 GMT
Sender: news@msuinfo.cl.msu.edu
Reply-To: courtney@arirang.cps.msu.edu (Jonathan Courtney)
Organization: PRIP Lab, Comp. Sci. Dept., MSU
Lines: 36


  I'm having some problems getting colormap segments as described in Chapter
20, XView Programming Manual, to work.  Perhaps someone could help?

  My code for creating the cms is as such:

===============================
  Xv_singlecolor colors[256];


  /* Grey scale */
  for (i=0; i<256; i++)
	colors[i].red = colors[i].green = colors[i].blue = i;	

  cms = (Cms) xv_create(NULL, CMS,
			CMS_SIZE, 256,
			CMS_COLORS, colors,
			CMS_COLOR_COUNT, 256,
			CMS_TYPE, XV_STATIC_CMS,
			CMS_NAME, "my_cms",
			NULL);

==============================

  Then I use the cms with a server image that is simply a ramp from 0-255.

  Unfortunately, it seems as if I can only allocate about the first 128
colors, because the last half of my ramp is all white.  Using CMS_TYPE
set to XV_DYNAMIC_CMS gives similar results.  Can't one create a cms with
more than 128 colors?  Do I need to fall back on Xlib colormap allocation
instead?

  I am running OW 2.0 on a sparcstation 2 .  Any help would be greatly
appreciated.

						Jon Courtney