Xref: utzoo comp.sys.sgi:2452 comp.windows.x:15459
Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!samsung!think!ames!haven!cvl!elsie!ado
From: ado@elsie.UUCP (Arthur David Olson)
Newsgroups: comp.sys.sgi,comp.windows.x
Subject: Wanted: help with IRIX 3.2/XV11R3 challenge (repost)
Message-ID: <9206@elsie.UUCP>
Date: 28 Nov 89 22:14:54 GMT
Followup-To: poster
Organization: NIH-LEC, Bethesda, MD
Lines: 96

Elsie is our Sun 3/280 running SunOS 4.0.3.  If I log in to elsie from the
console of our SGI IRIS 4D/70G and try to drop pixels into an X window,
things go awry--in particular, only the low-order four bits of the pixels
being written seem to make it to the window.

I've attached a typescript showing the problem (the incorrect results are
marked with ">>>>"s).

If you can tell me what I'm doing wrong, I'd appreciate hearing from you by
electronic mail.
-- 
	Arthur David Olson   ado@alw.nih.gov   ADO is a trademark of Ampex.

	Script started on Thu Nov 16 14:16:02 1989
	elsie$ cat try.c
	#include <stdio.h>
	#include <X11/Xlib.h>

	#define WIDTH	20
	#define HEIGHT	1

	Display *	display;
	int		screen_number;
	Visual *	visual;
	Window		root_window;
	Window		window;
	GC		default_gc;
	XImage *	ximage;
	char		data[WIDTH][HEIGHT];

	main()
	{
		int	x, y;

		display = XOpenDisplay((char *) NULL);
		if (display == 0)
			abort();

		root_window = DefaultRootWindow(display);
		screen_number = XDefaultScreen(display);
		visual = DefaultVisual(display, screen_number);
		default_gc = DefaultGC(display, screen_number);

		window = XCreateSimpleWindow(display, root_window, 300, 300,
			WIDTH, HEIGHT, 2, 0, 1);
		XMapWindow(display, window);
		XSync(display, 0);
		(void) printf("Tap RETURN when the window is in place.\n");
		(void) getchar();
		ximage = XCreateImage(display, visual, 8, ZPixmap,
			0, (char *) data, WIDTH, HEIGHT, 8, 0);
		if (ximage == 0)
			abort();

		for (x = 0; x < WIDTH; ++x)
			for (y = 0; y < HEIGHT; ++y)
				XPutPixel(ximage, x, y, x);

		XPutImage(display, window, default_gc, ximage,
			0, 0, 0, 0, WIDTH, HEIGHT);
		ximage = XGetImage(display, window, 0, 0,
			WIDTH, HEIGHT, (unsigned long) ~0, ZPixmap);

		for (x = 0; x < WIDTH; ++x)
			for (y = 0; y < HEIGHT; ++y)
				(void) printf("data[%d][%d]\t%d\n", x, y,
					XGetPixel(ximage, x, y));
		return 0;
	}
	elsie$ cc -g try.c -lX11 -o try
	elsie$ try
	Tap RETURN when the window is in place.

	data[0][0]	0
	data[1][0]	1
	data[2][0]	2
	data[3][0]	3
	data[4][0]	4
	data[5][0]	5
	data[6][0]	6
	data[7][0]	7
	data[8][0]	8
	data[9][0]	9
	data[10][0]	10
	data[11][0]	11
	data[12][0]	12
	data[13][0]	13
	data[14][0]	14
	data[15][0]	15
>>>>	data[16][0]	0
>>>>	data[17][0]	1
>>>>	data[18][0]	2
>>>>	data[19][0]	3
	elsie$ exit

	script done on Thu Nov 16 14:16:47 1989