/*
 * $Id$
 *
 * Copyright © 2004 Keith Packard
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, 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 Keith Packard not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  Keith Packard makes no
 * representations about the suitability of this software for any purpose.  It
 * is provided "as is" without express or implied warranty.
 *
 * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

#include "lpint.h"

int
_xlightpipe_lp_context (void)
{
    static int	context;

    while (!context)
	context = XUniqueContext ();
    return context;
}

light_pipe_window *
_xlightpipe_find_window (Display *display, Window window)
{
    light_pipe_window	*lpw;

    if (XFindContext (display, window, _xlightpipe_lp_context (), (XPointer *) &lpw) != 0)
	return 0;
    return lpw;
}

light_pipe_window *
_xlightpipe_add_window (Display *display, Window window, Bool provide_region)
{
    light_pipe_window	*lpw;

    if (XFindContext (display, window, _xlightpipe_lp_context (), (XPointer *) &lpw) == 0)
	return 0;
    lpw = malloc (sizeof (light_pipe_window));
    if (!lpw)
	return 0;
    if (XSaveContext (display, window, _xlightpipe_lp_context (), (char *) lpw) != 0)
    {
	free (lpw);
	return 0;
    }
    if (provide_region)
	lpw->public.damage_region = XCreateRegion ();
    else
	lpw->public.damage_region = NULL;
    if (!_xlightpipe_init_window (display, window, lpw))
    {
	XDeleteContext (display, window, _xlightpipe_lp_context());
	free (lpw);
	return 0;
    }
    return lpw;
}

void
_xlightpipe_remove_window (Display *display, Window window)
{
    light_pipe_window	*lpw;

    if (!XFindContext (display, window, _xlightpipe_lp_context (), (XPointer *) &lpw))
	return;
    (void) XDeleteContext (display, window, _xlightpipe_lp_context ());
    _xlightpipe_fini_window (display, window, lpw);
    if (lpw->public.damage_region)
	XDestroyRegion (lpw->public.damage_region);
    free (lpw);
}