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From: phaedrus@eneevax.UUCP (The Sophist)
Newsgroups: net.graphics
Subject: HELP!! SUN specific graphics question.
Message-ID: <225@eneevax.UUCP>
Date: Thu, 24-Jan-85 14:15:43 EST
Article-I.D.: eneevax.225
Posted: Thu Jan 24 14:15:43 1985
Date-Received: Mon, 28-Jan-85 07:12:15 EST
Distribution: net
Organization: EE Dept, Maryversity of Uniland
Lines: 49


Ok, here are the preliminaries:

	I am working on a Sun running Berkeley 4.2.
	I am working at the `pixrect' level.

What I need to do is to define a colormap so that I can make the pixels
be nine different and very distinct colors.  The Sun manuals have no
examples on how to set up the colormap and I don't have too much
experience with graphics so, I am going no where trying to figure it
out.  Could someone please tell me how to set up a colormap at the
pixrect level?  If that isn't possible, could someone send me an
example of a colormap that they have set up (liberally sprinkled with
comments)?  And if that isn't possible could someone explain to me how
the following routine (which sets up a colormap) works?  I don't quite
understand what all the shifting and the oring does.


int mak_col_map ()
{
    int     index;
    unsigned char   red[256],
                    blue[256],
                    green[256];
    int     r,
            b,
            g;

    for (b = 0; b < 4; b++) {
	for (g = 0; g < 8; g++) {
	    for (r = 0; r < 8; r++) {
		index = (b << 6) | (g << 3) | (r);
		blue[index] = b * 84;
		red[index] = r * 36;
		green[index] = g * 36;
	    }
	}
    }
    pr_putcolormap (col_mon, 0, 256, red, green, blue);
}

Thanks in advance.
-- 
			Pravin Kumar

Don't bother me! I'm on an emergency third rail power trip.

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