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From: huw@siesoft.co.uk (Huw Roberts)
Newsgroups: comp.windows.x
Subject: HELP needed with BadMatch error
Summary: I can't put an image into a one bit deep pixmap
Keywords: badmatch image pixmap problem
Message-ID: <1991Mar21.083826.6036@siesoft.co.uk>
Date: 21 Mar 91 08:38:26 GMT
Sender: usenet@siesoft.co.uk (NNTP Poster)
Distribution: comp
Organization: Siemens-Nixdorf Systems Development Group, UK
Lines: 76

The following program gives the following protocol error and I can't work
out why.  Enlightenment would be greatly appreciated.  A sensible mechanism
for fixing it would also be appreciated.

The protocol error:
-------------------------------------------------------------------------------
X Error:  BadMatch, invalid parameter attributes
  Request Major code 72 ()
  Request Minor code
  ResourceID 0xe00002
  Error Serial #13
  Current Serial #14
-------------------------------------------------------------------------------
The code:
-------------------------------------------------------------------------------
#include <stdio.h>

#include <X11/Intrinsic.h>
#include <X11/IntrinsicP.h>
#include <X11/CoreP.h>
#include <X11/Xatom.h>
#include <Xm/DrawingA.h>

int data[3][3] = { 0,1,0, 1,1,1, 0,1,0 };

Display *display;
int rows=3, cols=3;

main( argc, argv )
int    argc;
char    *argv[];
{
    int    row, col;
    Widget toplevel;
    XImage *mask;
    Screen *screen;
    Pixmap maskp;

    int n;
    Arg args[10];

    extern char *pm_progname = argv[0];

    toplevel = XtInitialize ("viewer", "Pgmtoxpm", NULL, NULL, &argc, argv);
    display = XtDisplay(toplevel);
    screen = XtScreen(toplevel);

    XSynchronize(display, True);

    mask = XCreateImage(display, DefaultVisualOfScreen(screen),
			1, XYBitmap, 0, 0,
			((cols>>3)+1)<<3, rows, 8, 0);
    mask->data = malloc((mask->bytes_per_line+100) * (rows+100));

    /* Initialize. */
    for ( row = 0; row < rows; row++)
    {
	for ( col = 0; col < cols; col++)
	    XPutPixel(mask, col, row, data[row][col]);
    }

    maskp = XCreatePixmap(display, RootWindowOfScreen(screen), cols, rows, 1);
    XPutImage(display, maskp, DefaultGCOfScreen(screen), mask, 0, 0, 0, 0,
		cols, rows);
}
-------------------------------------------------------------------------------
Basically the problem is with the last statement.  Note that both the Image
and the Pixmap have depth 1.

Huw
P.S.  Could you mail any replies because we tend to lose articles from
comp.windows.x.  Thanks
--
If you want to flame, mail me directly and I'll summarise the best.
Huw Roberts (huw@siesoft.co.uk) Siemens Plc., System Development Group, Woodley
House, 65-73, Crockhamwell Road, Woodley, Reading, Berkshire, RG5 3JP  England.