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From: howardl@sgi.com (Howard Look)
Newsgroups: comp.sys.sgi
Subject: Re: Putting an image onto the IRIS root window
Message-ID: <1990Dec3.201027.7649@odin.corp.sgi.com>
Date: 3 Dec 90 20:10:27 GMT
References: <3016@uc.msc.umn.edu>
Sender: news@odin.corp.sgi.com (Net News)
Organization: Silicon Graphics, Inc., Mountain View, CA
Lines: 121

In article <3016@uc.msc.umn.edu> wes@msc.edu writes:
>Is there a way to place an image onto the root window of a 4D series
>IRIS?  The first step would be to convert the image from whatever
>format it is in to the proper format (IRIS rle maybe?).  The next
>step would be to load it onto the root.  I have not found any information
>about this in the manuals.  Has anyone done this?

Check out the man page for imakebackground. You could use longimage
from the image library to read a .rgb file, and then lrectwrite to
get it into the window.

Here's a copy of the now infamous night background to give you an
idea of how to use imakebackground.

Enjoy,
Howard.

/***** CUT HERE ******/
#include "gl.h"
#include "device.h"

/*
A way cool background that looks like the twilight sky.
Start it up in user.ps

Howard Look, April 13, 1990
*/

main()
{
	int gid;
	
	imakebackground() ;

	gid = winopen("") ;
	RGBmode();
	gconfig();
	shademodel(GOURAUD);
	
	ortho2(0.0, 1.0, 0.0, 1.0) ;

	qenter(REDRAW,gid);

	while (1)
	{
		short val ;
		long dev = qread(&val) ;
		if (dev == REDRAW) draw_background() ;
	}
}

#define Y1 0.0
#define Y2 .2

draw_background()
{
    int i,j;
	static int orange[] = {255,72,0};
	static int blueish[] = {0,110,189};
	static int black[] = {0,0,0};
	static int red[] = {255,0,0};
	float v1[2],v2[2],v3[2],v4[2];

	v1[0] = v4[0] = 0.0;
	v2[0] = v3[0] = 1.0;

	v1[1] = v2[1] = 0.0;
	v3[1] = v4[1] = Y1;
	bgnpolygon();
		c3i(red);
		v2f(v1);
		v2f(v2);
		c3i(orange);
		v2f(v3);
		v2f(v4);
	endpolygon();

	v1[1] = v2[1] = Y2;
	bgnpolygon();
		c3i(orange);
		v2f(v4);
		v2f(v3);
		c3i(blueish);
		v2f(v2);
		v2f(v1);
	endpolygon();

	v3[1] = v4[1] = 1.0;
	bgnpolygon();
		c3i(blueish);
		v2f(v1);
		v2f(v2);
		c3i(black);
		v2f(v3);
		v2f(v4);
	endpolygon();

	cpack(0xFFFFFF);

    for (j=0; j<10; j++)
    {
        bgnpoint();
        for (i=0; i<256; i++)
        {
			float x[2];
			x[0] = ((float)rand())/32767.0;
			x[1] = ((float)rand())/32767.0;
			v2f(x);
        }
        endpoint();
    }

    for (j =0; j<200; j++)
    {
		float x[2],r;
		x[0] = ((float)rand())/32767.0;
		x[1] = ((float)rand())/32767.0;
		r = ((float)rand())/32767.0/500.0;
		circf(x[0],x[1],r);
    }
}