xref: /xsrc/external/mit/libX11/dist/src/GetStCmap.c

/***********************************************************

Copyright 1987, 1998  The Open Group

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Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the name of Digital not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.

DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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******************************************************************/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <X11/Xlibint.h>
#include <X11/Xutil.h>
#include "Xatomtype.h"
#include <X11/Xatom.h>

/*
 * 				    WARNING
 *
 * This is a pre-ICCCM routine.  It must not reference any of the new fields
 * in the XStandardColormap structure.
 */

Status XGetStandardColormap (
    Display *dpy,
    Window w,
    XStandardColormap *cmap,
    Atom property)		/* XA_RGB_BEST_MAP, etc. */
{
    Status stat;			/* return value */
    XStandardColormap *stdcmaps;	/* will get malloced value */
    int nstdcmaps;			/* count of above */

    stat = XGetRGBColormaps (dpy, w, &stdcmaps, &nstdcmaps, property);
    if (stat) {
	XStandardColormap *use;

	if (nstdcmaps > 1) {
	    VisualID vid;
	    Screen *sp = _XScreenOfWindow (dpy, w);
	    int i;

	    if (!sp) {
		Xfree (stdcmaps);
		return False;
	    }
	    vid = sp->root_visual->visualid;

	    for (i = 0; i < nstdcmaps; i++) {
		if (stdcmaps[i].visualid == vid) break;
	    }

	    if (i == nstdcmaps) {	/* not found */
		Xfree (stdcmaps);
		return False;
	    }
	    use = &stdcmaps[i];
	} else {
	    use = stdcmaps;
	}

	/*
	 * assign only those fields which were in the pre-ICCCM version
	 */
	cmap->colormap	 = use->colormap;
	cmap->red_max	 = use->red_max;
	cmap->red_mult	 = use->red_mult;
	cmap->green_max	 = use->green_max;
	cmap->green_mult = use->green_mult;
	cmap->blue_max	 = use->blue_max;
	cmap->blue_mult	 = use->blue_mult;
	cmap->base_pixel = use->base_pixel;

	Xfree (stdcmaps);	/* don't need allocated memory */
    }
    return stat;
}