gtk/gdk/x11/gdkxid.c
Matthias Clasen 73153b42e8 Use an unused high bit in the XID to mark fonts in the global xid hash
2006-01-19  Matthias Clasen  <mclasen@redhat.com>

	* gdk/x11/gdkprivate-x11.h (XID_FONT_BIT):
	* gdk/x11/gdkfont-x11.c:
	* gdk/x11/gdkxid.c: Use an unused high bit in the
	XID to mark fonts in the global xid hash table.

	* gdk/x11/gdkcursor-x11.c (update_cursor): Skip fonts
	when iterating over the xid hash table, since calling
	GDK_IS_WINDOW () on an GdkFont can cause a segfault.
	(#327751, Ryan Lortie)
2006-01-20 04:35:24 +00:00

136 lines
3.3 KiB
C

/* GDK - The GIMP Drawing Kit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include <config.h>
#include "gdkx.h"
#include "gdkprivate-x11.h"
#include "gdkdisplay-x11.h"
#include "gdkalias.h"
#include <stdio.h>
static guint gdk_xid_hash (XID *xid);
static gboolean gdk_xid_equal (XID *a,
XID *b);
/* The 3 high bits of XIDs are unused. We use one to mark fonts,
* since we must be able to skip fonts when iterating over all XIDs.
*/
#define XID_FONT_BIT (1<<31)
void
_gdk_xid_table_insert (GdkDisplay *display,
XID *xid,
gpointer data)
{
GdkDisplayX11 *display_x11;
g_return_if_fail (xid != NULL);
g_return_if_fail (GDK_IS_DISPLAY (display));
display_x11 = GDK_DISPLAY_X11 (display);
if (!display_x11->xid_ht)
display_x11->xid_ht = g_hash_table_new ((GHashFunc) gdk_xid_hash,
(GEqualFunc) gdk_xid_equal);
g_hash_table_insert (display_x11->xid_ht, xid, data);
}
void
_gdk_xid_table_remove (GdkDisplay *display,
XID xid)
{
GdkDisplayX11 *display_x11;
g_return_if_fail (GDK_IS_DISPLAY (display));
display_x11 = GDK_DISPLAY_X11 (display);
if (display_x11->xid_ht)
g_hash_table_remove (display_x11->xid_ht, &xid);
}
/**
* gdk_xid_table_lookup_for_display:
* @display: the #GdkDisplay.
* @xid: an X id.
*
* Returns the GDK object associated with the given X id.
*
* Returns: a GDK object associated with the given X id.
*
* Since: 2.2
*/
gpointer
gdk_xid_table_lookup_for_display (GdkDisplay *display,
XID xid)
{
GdkDisplayX11 *display_x11;
gpointer data = NULL;
g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
display_x11 = GDK_DISPLAY_X11 (display);
if (display_x11->xid_ht)
data = g_hash_table_lookup (display_x11->xid_ht, &xid);
return data;
}
/**
* gdk_xid_table_lookup:
* @xid: an X id.
*
* Returns the Gdk object associated with the given X id.
*
* Return value: the associated Gdk object, which may be a #GdkPixmap,
* a #GdkWindow or a #GdkFont.
**/
gpointer
gdk_xid_table_lookup (XID xid)
{
return gdk_xid_table_lookup_for_display (gdk_display_get_default (), xid);
}
static guint
gdk_xid_hash (XID *xid)
{
return *xid;
}
static gboolean
gdk_xid_equal (XID *a,
XID *b)
{
return ((*a & ~XID_FONT_BIT) == (*b & ~XID_FONT_BIT));
}
#define __GDK_XID_C__
#include "gdkaliasdef.c"