Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!sdd.hp.com!hp-pcd!hpcvlx!paulm
From: paulm@hpcvlx.cv.hp.com (Paul J. McClellan)
Newsgroups: comp.windows.x.motif
Subject: Re: PushButton Pixmap problems
Message-ID: <110630020@hpcvlx.cv.hp.com>
Date: 18 Oct 90 17:16:03 GMT
References: <12110003@hpfcbig.SDE.HP.COM>
Organization: Hewlett-Packard Co., Corvallis, OR, USA
Lines: 133


Below is an example client illustrating how one can read a bitmap from
a bitmap file, create a pixmap from it, and set a XmLabel's labelPixmap
resource.  

 +--------------------------------------------------------------------+
 | Paul J. McClellan                 | paulm@cv.hp.com                |
 | Information Technology Operation  | {backbone}!hplabs!hp-pcd!paulm |
 | Hewlett Packard Co.               | (USA) (503) 750-2493  VOICE    |
 +--------------------------------------------------------------------+


/************************************************************************
 *  File:  label_pixmap.c
 *
 *  Reads a bitmap from a bitmap file and creates a label pixmap from it.
 ***********************************************************************/

#include <stdio.h>
#include <X11/StringDefs.h>
#include <X11/Intrinsic.h>
#include <Xt/MwmUtil.h>
#include <Xm/Xm.h>
#include <Xm/Label.h>

/************************************************************************
 *  main
 ***********************************************************************/

main (argc, argv)
    int argc;
    char **argv;
{
    Widget    toplevel, label;

    /*
     *  Initialize the Intrinsics and create the Label widget.
     */
  
    toplevel =  XtInitialize (argv[0], "App-notes", NULL, 0, &argc, argv);

    label = XmCreateLabel (toplevel, "label", NULL, 0);
    XtManageChild (label);

    /*
     *  Read any specified bitmap file.  Construct the label pixmap from it.
     */

    if (argc && argv[1])
    {
	Display      *dpy;
	Screen       *screen;
        int           x, y, n;
        unsigned int  width, height;
        Arg           wargs[3];
        Pixmap        bitmap;

        dpy = XtDisplay (toplevel);
        screen = XtScreen (toplevel);
        if (XReadBitmapFile (dpy, RootWindowOfScreen (screen),
			     argv[1], &width, &height, &bitmap, &x, &y)
            != BitmapSuccess)
        {
            fprintf (stderr, "Unable to read bitmap file %s\n", argv[1]);
	    bitmap = NULL;
        }

        if (bitmap && (width == 0 || height == 0))
        {
            fprintf (stderr, "Invalid bitmap file %s\n", argv[1]);
	    bitmap = NULL;
        }

        if (bitmap)
	{
            Pixel         fg, bg;
            Pixmap        pixmap;
            GC            gc;
            XGCValues     gcv;

            /*
             * Get the foreground and background colors from the label widget.
             */

            n = 0;
            XtSetArg (wargs[n], XtNforeground, &fg); n++;
            XtSetArg (wargs[n], XtNbackground, &bg); n++;
            XtGetValues (label, wargs, n);

            /* 
             * Create a pixmap of the appropriate size, root, and depth.
             */

            pixmap = XCreatePixmap (dpy, RootWindowOfScreen (screen),
				    width, height,
                                    DefaultDepthOfScreen (screen));

            /*
	     * Create a GC and copy the bitmap to the pixmap.
             */

            gcv.foreground = bg;
            gcv.background = bg;
            gc = XCreateGC (dpy, pixmap, (GCForeground|GCBackground), &gcv);
   
            /*
	     * Fill in the background, set the foreground, copy the bitmap to 
	     * the pixmap, and free the gc.
             */

            XFillRectangle (dpy, pixmap, gc, 0, 0, width, height);
            XSetForeground (dpy, gc, fg);
            XCopyPlane (dpy, bitmap, pixmap, gc, 0, 0, width, height, 0, 0, 1L);
            XFreeGC (dpy, gc);
   
            /*
	     * Set the labelType and labelPixmap resources.
             */

            n = 0;
            XtSetArg (wargs[n], XmNlabelType, XmPIXMAP); n++;
            XtSetArg (wargs[n], XmNlabelPixmap, pixmap); n++;
            XtSetValues (label, wargs, n);
	}
    }

    /*
     *  Realize the widget hierarchy and enter the main loop.
     */

    XtRealizeWidget (toplevel);
    XtMainLoop ();
}