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gtk/gdk/x11/gdkproperty-x11.c
Matthias Clasen de62a1096b Drop support for pre-R6 X 
X11 R6 was released in 1995 - time to let go.
2012-03-10 23:27:21 -05:00

757 lines
20 KiB
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/* 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, see <http://www.gnu.org/licenses/>.
*/
/*
* 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 "gdkproperty.h"
#include "gdkmain.h"
#include "gdkprivate.h"
#include "gdkinternals.h"
#include "gdkselection.h"
#include "gdkprivate-x11.h"
#include "gdkdisplay-x11.h"
#include "gdkscreen-x11.h"
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <string.h>
/**
* SECTION:properties
* @Short_description: Functions to manipulate properties on windows
* @Title: Properties and Atoms
*
* Each window under X can have any number of associated
* <firstterm>properties</firstterm> attached to it.
* Properties are arbitrary chunks of data identified by
* <firstterm>atom</firstterm>s. (An <firstterm>atom</firstterm>
* is a numeric index into a string table on the X server. They are used
* to transfer strings efficiently between clients without
* having to transfer the entire string.) A property
* has an associated type, which is also identified
* using an atom.
*
* A property has an associated <firstterm>format</firstterm>,
* an integer describing how many bits are in each unit
* of data inside the property. It must be 8, 16, or 32.
* When data is transferred between the server and client,
* if they are of different endianesses it will be byteswapped
* as necessary according to the format of the property.
* Note that on the client side, properties of format 32
* will be stored with one unit per <emphasis>long</emphasis>,
* even if a long integer has more than 32 bits on the platform.
* (This decision was apparently made for Xlib to maintain
* compatibility with programs that assumed longs were 32
* bits, at the expense of programs that knew better.)
*
* The functions in this section are used to add, remove
* and change properties on windows, to convert atoms
* to and from strings and to manipulate some types of
* data commonly stored in X window properties.
*/
static GPtrArray *virtual_atom_array;
static GHashTable *virtual_atom_hash;
static const gchar xatoms_string[] =
/* These are all the standard predefined X atoms */
"\0" /* leave a space for None, even though it is not a predefined atom */
"PRIMARY\0"
"SECONDARY\0"
"ARC\0"
"ATOM\0"
"BITMAP\0"
"CARDINAL\0"
"COLORMAP\0"
"CURSOR\0"
"CUT_BUFFER0\0"
"CUT_BUFFER1\0"
"CUT_BUFFER2\0"
"CUT_BUFFER3\0"
"CUT_BUFFER4\0"
"CUT_BUFFER5\0"
"CUT_BUFFER6\0"
"CUT_BUFFER7\0"
"DRAWABLE\0"
"FONT\0"
"INTEGER\0"
"PIXMAP\0"
"POINT\0"
"RECTANGLE\0"
"RESOURCE_MANAGER\0"
"RGB_COLOR_MAP\0"
"RGB_BEST_MAP\0"
"RGB_BLUE_MAP\0"
"RGB_DEFAULT_MAP\0"
"RGB_GRAY_MAP\0"
"RGB_GREEN_MAP\0"
"RGB_RED_MAP\0"
"STRING\0"
"VISUALID\0"
"WINDOW\0"
"WM_COMMAND\0"
"WM_HINTS\0"
"WM_CLIENT_MACHINE\0"
"WM_ICON_NAME\0"
"WM_ICON_SIZE\0"
"WM_NAME\0"
"WM_NORMAL_HINTS\0"
"WM_SIZE_HINTS\0"
"WM_ZOOM_HINTS\0"
"MIN_SPACE\0"
"NORM_SPACE\0"
"MAX_SPACE\0"
"END_SPACE\0"
"SUPERSCRIPT_X\0"
"SUPERSCRIPT_Y\0"
"SUBSCRIPT_X\0"
"SUBSCRIPT_Y\0"
"UNDERLINE_POSITION\0"
"UNDERLINE_THICKNESS\0"
"STRIKEOUT_ASCENT\0"
"STRIKEOUT_DESCENT\0"
"ITALIC_ANGLE\0"
"X_HEIGHT\0"
"QUAD_WIDTH\0"
"WEIGHT\0"
"POINT_SIZE\0"
"RESOLUTION\0"
"COPYRIGHT\0"
"NOTICE\0"
"FONT_NAME\0"
"FAMILY_NAME\0"
"FULL_NAME\0"
"CAP_HEIGHT\0"
"WM_CLASS\0"
"WM_TRANSIENT_FOR\0"
/* Below here, these are our additions. Increment N_CUSTOM_PREDEFINED
* if you add any.
*/
"CLIPBOARD\0" /* = 69 */
;
static const gint xatoms_offset[] = {
0, 1, 9, 19, 23, 28, 35, 44, 53, 60, 72, 84,
96, 108, 120, 132, 144, 156, 165, 170, 178, 185, 189, 201,
218, 232, 245, 258, 274, 287, 301, 313, 320, 329, 336, 347,
356, 374, 387, 400, 408, 424, 438, 452, 462, 473, 483, 493,
507, 521, 533, 545, 564, 584, 601, 619, 632, 641, 652, 659,
670, 681, 691, 698, 708, 720, 730, 741, 750, 767
};
#define N_CUSTOM_PREDEFINED 1
#define ATOM_TO_INDEX(atom) (GPOINTER_TO_UINT(atom))
#define INDEX_TO_ATOM(atom) ((GdkAtom)GUINT_TO_POINTER(atom))
static void
insert_atom_pair (GdkDisplay *display,
GdkAtom virtual_atom,
Atom xatom)
{
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
if (!display_x11->atom_from_virtual)
{
display_x11->atom_from_virtual = g_hash_table_new (g_direct_hash, NULL);
display_x11->atom_to_virtual = g_hash_table_new (g_direct_hash, NULL);
}
g_hash_table_insert (display_x11->atom_from_virtual,
GDK_ATOM_TO_POINTER (virtual_atom),
GUINT_TO_POINTER (xatom));
g_hash_table_insert (display_x11->atom_to_virtual,
GUINT_TO_POINTER (xatom),
GDK_ATOM_TO_POINTER (virtual_atom));
}
static Atom
lookup_cached_xatom (GdkDisplay *display,
GdkAtom atom)
{
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
if (ATOM_TO_INDEX (atom) < G_N_ELEMENTS (xatoms_offset) - N_CUSTOM_PREDEFINED)
return ATOM_TO_INDEX (atom);
if (display_x11->atom_from_virtual)
return GPOINTER_TO_UINT (g_hash_table_lookup (display_x11->atom_from_virtual,
GDK_ATOM_TO_POINTER (atom)));
return None;
}
/**
* gdk_x11_atom_to_xatom_for_display:
* @display: A #GdkDisplay
* @atom: A #GdkAtom, or %GDK_NONE
*
* Converts from a #GdkAtom to the X atom for a #GdkDisplay
* with the same string value. The special value %GDK_NONE
* is converted to %None.
*
* Return value: the X atom corresponding to @atom, or %None
*
* Since: 2.2
**/
Atom
gdk_x11_atom_to_xatom_for_display (GdkDisplay *display,
GdkAtom atom)
{
Atom xatom = None;
g_return_val_if_fail (GDK_IS_DISPLAY (display), None);
if (atom == GDK_NONE)
return None;
if (gdk_display_is_closed (display))
return None;
xatom = lookup_cached_xatom (display, atom);
if (!xatom)
{
char *name;
g_return_val_if_fail (ATOM_TO_INDEX (atom) < virtual_atom_array->len, None);
name = g_ptr_array_index (virtual_atom_array, ATOM_TO_INDEX (atom));
xatom = XInternAtom (GDK_DISPLAY_XDISPLAY (display), name, FALSE);
insert_atom_pair (display, atom, xatom);
}
return xatom;
}
void
_gdk_x11_precache_atoms (GdkDisplay *display,
const gchar * const *atom_names,
gint n_atoms)
{
Atom *xatoms;
GdkAtom *atoms;
const gchar **xatom_names;
gint n_xatoms;
gint i;
xatoms = g_new (Atom, n_atoms);
xatom_names = g_new (const gchar *, n_atoms);
atoms = g_new (GdkAtom, n_atoms);
n_xatoms = 0;
for (i = 0; i < n_atoms; i++)
{
GdkAtom atom = gdk_atom_intern_static_string (atom_names[i]);
if (lookup_cached_xatom (display, atom) == None)
{
atoms[n_xatoms] = atom;
xatom_names[n_xatoms] = atom_names[i];
n_xatoms++;
}
}
if (n_xatoms)
XInternAtoms (GDK_DISPLAY_XDISPLAY (display),
(char **)xatom_names, n_xatoms, False, xatoms);
for (i = 0; i < n_xatoms; i++)
insert_atom_pair (display, atoms[i], xatoms[i]);
g_free (xatoms);
g_free (xatom_names);
g_free (atoms);
}
/**
* gdk_x11_atom_to_xatom:
* @atom: A #GdkAtom
*
* Converts from a #GdkAtom to the X atom for the default GDK display
* with the same string value.
*
* Return value: the X atom corresponding to @atom.
**/
Atom
gdk_x11_atom_to_xatom (GdkAtom atom)
{
return gdk_x11_atom_to_xatom_for_display (gdk_display_get_default (), atom);
}
/**
* gdk_x11_xatom_to_atom_for_display:
* @display: A #GdkDisplay
* @xatom: an X atom
*
* Convert from an X atom for a #GdkDisplay to the corresponding
* #GdkAtom.
*
* Return value: (transfer none): the corresponding #GdkAtom.
*
* Since: 2.2
**/
GdkAtom
gdk_x11_xatom_to_atom_for_display (GdkDisplay *display,
Atom xatom)
{
GdkX11Display *display_x11;
GdkAtom virtual_atom = GDK_NONE;
g_return_val_if_fail (GDK_IS_DISPLAY (display), GDK_NONE);
if (xatom == None)
return GDK_NONE;
if (gdk_display_is_closed (display))
return GDK_NONE;
display_x11 = GDK_X11_DISPLAY (display);
if (xatom < G_N_ELEMENTS (xatoms_offset) - N_CUSTOM_PREDEFINED)
return INDEX_TO_ATOM (xatom);
if (display_x11->atom_to_virtual)
virtual_atom = GDK_POINTER_TO_ATOM (g_hash_table_lookup (display_x11->atom_to_virtual,
GUINT_TO_POINTER (xatom)));
if (!virtual_atom)
{
/* If this atom doesn't exist, we'll die with an X error unless
* we take precautions
*/
char *name;
gdk_x11_display_error_trap_push (display);
name = XGetAtomName (GDK_DISPLAY_XDISPLAY (display), xatom);
if (gdk_x11_display_error_trap_pop (display))
{
g_warning (G_STRLOC " invalid X atom: %ld", xatom);
}
else
{
virtual_atom = gdk_atom_intern (name, FALSE);
XFree (name);
insert_atom_pair (display, virtual_atom, xatom);
}
}
return virtual_atom;
}
/**
* gdk_x11_xatom_to_atom:
* @xatom: an X atom for the default GDK display
*
* Convert from an X atom for the default display to the corresponding
* #GdkAtom.
*
* Return value: (transfer none): the corresponding G#dkAtom.
**/
GdkAtom
gdk_x11_xatom_to_atom (Atom xatom)
{
return gdk_x11_xatom_to_atom_for_display (gdk_display_get_default (), xatom);
}
static void
virtual_atom_check_init (void)
{
if (!virtual_atom_hash)
{
gint i;
virtual_atom_hash = g_hash_table_new (g_str_hash, g_str_equal);
virtual_atom_array = g_ptr_array_new ();
for (i = 0; i < G_N_ELEMENTS (xatoms_offset); i++)
{
g_ptr_array_add (virtual_atom_array, (gchar *)(xatoms_string + xatoms_offset[i]));
g_hash_table_insert (virtual_atom_hash, (gchar *)(xatoms_string + xatoms_offset[i]),
GUINT_TO_POINTER (i));
}
}
}
GdkAtom
_gdk_x11_display_manager_atom_intern (GdkDisplayManager *manager,
const gchar *atom_name,
gboolean dup)
{
GdkAtom result;
virtual_atom_check_init ();
result = GDK_POINTER_TO_ATOM (g_hash_table_lookup (virtual_atom_hash, atom_name));
if (!result)
{
result = INDEX_TO_ATOM (virtual_atom_array->len);
g_ptr_array_add (virtual_atom_array, dup ? g_strdup (atom_name) : (gchar *)atom_name);
g_hash_table_insert (virtual_atom_hash,
g_ptr_array_index (virtual_atom_array,
ATOM_TO_INDEX (result)),
GDK_ATOM_TO_POINTER (result));
}
return result;
}
static const gchar *
get_atom_name (GdkAtom atom)
{
virtual_atom_check_init ();
if (ATOM_TO_INDEX (atom) < virtual_atom_array->len)
return g_ptr_array_index (virtual_atom_array, ATOM_TO_INDEX (atom));
else
return NULL;
}
gchar *
_gdk_x11_display_manager_get_atom_name (GdkDisplayManager *manager,
GdkAtom atom)
{
return g_strdup (get_atom_name (atom));
}
/**
* gdk_x11_get_xatom_by_name_for_display:
* @display: a #GdkDisplay
* @atom_name: a string
*
* Returns the X atom for a #GdkDisplay corresponding to @atom_name.
* This function caches the result, so if called repeatedly it is much
* faster than XInternAtom(), which is a round trip to the server each time.
*
* Return value: a X atom for a #GdkDisplay
*
* Since: 2.2
**/
Atom
gdk_x11_get_xatom_by_name_for_display (GdkDisplay *display,
const gchar *atom_name)
{
g_return_val_if_fail (GDK_IS_DISPLAY (display), None);
return gdk_x11_atom_to_xatom_for_display (display,
gdk_atom_intern (atom_name, FALSE));
}
/**
* gdk_x11_get_xatom_by_name:
* @atom_name: a string
*
* Returns the X atom for GDK's default display corresponding to @atom_name.
* This function caches the result, so if called repeatedly it is much
* faster than XInternAtom(), which is a round trip to the server each time.
*
* Return value: a X atom for GDK's default display.
**/
Atom
gdk_x11_get_xatom_by_name (const gchar *atom_name)
{
return gdk_x11_get_xatom_by_name_for_display (gdk_display_get_default (),
atom_name);
}
/**
* gdk_x11_get_xatom_name_for_display:
* @display: the #GdkDisplay where @xatom is defined
* @xatom: an X atom
*
* Returns the name of an X atom for its display. This
* function is meant mainly for debugging, so for convenience, unlike
* XAtomName() and gdk_atom_name(), the result doesn't need to
* be freed.
*
* Return value: name of the X atom; this string is owned by GDK,
* so it shouldn't be modifed or freed.
*
* Since: 2.2
**/
const gchar *
gdk_x11_get_xatom_name_for_display (GdkDisplay *display,
Atom xatom)
{
g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
return get_atom_name (gdk_x11_xatom_to_atom_for_display (display, xatom));
}
/**
* gdk_x11_get_xatom_name:
* @xatom: an X atom for GDK's default display
*
* Returns the name of an X atom for GDK's default display. This
* function is meant mainly for debugging, so for convenience, unlike
* <function>XAtomName()</function> and gdk_atom_name(), the result
* doesn't need to be freed. Also, this function will never return %NULL,
* even if @xatom is invalid.
*
* Return value: name of the X atom; this string is owned by GTK+,
* so it shouldn't be modifed or freed.
**/
const gchar *
gdk_x11_get_xatom_name (Atom xatom)
{
return get_atom_name (gdk_x11_xatom_to_atom (xatom));
}
gboolean
_gdk_x11_window_get_property (GdkWindow *window,
GdkAtom property,
GdkAtom type,
gulong offset,
gulong length,
gint pdelete,
GdkAtom *actual_property_type,
gint *actual_format_type,
gint *actual_length,
guchar **data)
{
GdkDisplay *display;
Atom ret_prop_type;
gint ret_format;
gulong ret_nitems;
gulong ret_bytes_after;
gulong get_length;
gulong ret_length;
guchar *ret_data;
Atom xproperty;
Atom xtype;
int res;
g_return_val_if_fail (!window || GDK_WINDOW_IS_X11 (window), FALSE);
if (!window)
{
GdkScreen *screen = gdk_screen_get_default ();
window = gdk_screen_get_root_window (screen);
GDK_NOTE (MULTIHEAD, g_message ("gdk_property_get(): window is NULL\n"));
}
else if (!GDK_WINDOW_IS_X11 (window))
return FALSE;
if (GDK_WINDOW_DESTROYED (window))
return FALSE;
display = gdk_window_get_display (window);
xproperty = gdk_x11_atom_to_xatom_for_display (display, property);
if (type == GDK_NONE)
xtype = AnyPropertyType;
else
xtype = gdk_x11_atom_to_xatom_for_display (display, type);
ret_data = NULL;
/*
* Round up length to next 4 byte value. Some code is in the (bad?)
* habit of passing G_MAXLONG as the length argument, causing an
* overflow to negative on the add. In this case, we clamp the
* value to G_MAXLONG.
*/
get_length = length + 3;
if (get_length > G_MAXLONG)
get_length = G_MAXLONG;
/* To fail, either the user passed 0 or G_MAXULONG */
get_length = get_length / 4;
if (get_length == 0)
{
g_warning ("gdk_propery-get(): invalid length 0");
return FALSE;
}
res = XGetWindowProperty (GDK_DISPLAY_XDISPLAY (display),
GDK_WINDOW_XID (window), xproperty,
offset, get_length, pdelete,
xtype, &ret_prop_type, &ret_format,
&ret_nitems, &ret_bytes_after,
&ret_data);
if (res != Success || (ret_prop_type == None && ret_format == 0))
{
return FALSE;
}
if (actual_property_type)
*actual_property_type = gdk_x11_xatom_to_atom_for_display (display, ret_prop_type);
if (actual_format_type)
*actual_format_type = ret_format;
if ((xtype != AnyPropertyType) && (ret_prop_type != xtype))
{
XFree (ret_data);
g_warning ("Couldn't match property type %s to %s\n",
gdk_x11_get_xatom_name_for_display (display, ret_prop_type),
gdk_x11_get_xatom_name_for_display (display, xtype));
return FALSE;
}
/* FIXME: ignoring bytes_after could have very bad effects */
if (data)
{
if (ret_prop_type == XA_ATOM ||
ret_prop_type == gdk_x11_get_xatom_by_name_for_display (display, "ATOM_PAIR"))
{
/*
* data is an array of X atom, we need to convert it
* to an array of GDK Atoms
*/
gint i;
GdkAtom *ret_atoms = g_new (GdkAtom, ret_nitems);
Atom *xatoms = (Atom *)ret_data;
*data = (guchar *)ret_atoms;
for (i = 0; i < ret_nitems; i++)
ret_atoms[i] = gdk_x11_xatom_to_atom_for_display (display, xatoms[i]);
if (actual_length)
*actual_length = ret_nitems * sizeof (GdkAtom);
}
else
{
switch (ret_format)
{
case 8:
ret_length = ret_nitems;
break;
case 16:
ret_length = sizeof(short) * ret_nitems;
break;
case 32:
ret_length = sizeof(long) * ret_nitems;
break;
default:
g_warning ("unknown property return format: %d", ret_format);
XFree (ret_data);
return FALSE;
}
*data = g_new (guchar, ret_length);
memcpy (*data, ret_data, ret_length);
if (actual_length)
*actual_length = ret_length;
}
}
XFree (ret_data);
return TRUE;
}
void
_gdk_x11_window_change_property (GdkWindow *window,
GdkAtom property,
GdkAtom type,
gint format,
GdkPropMode mode,
const guchar *data,
gint nelements)
{
GdkDisplay *display;
Window xwindow;
Atom xproperty;
Atom xtype;
g_return_if_fail (!window || GDK_WINDOW_IS_X11 (window));
if (!window)
{
GdkScreen *screen;
screen = gdk_screen_get_default ();
window = gdk_screen_get_root_window (screen);
GDK_NOTE (MULTIHEAD, g_message ("gdk_property_change(): window is NULL\n"));
}
else if (!GDK_WINDOW_IS_X11 (window))
return;
if (GDK_WINDOW_DESTROYED (window))
return;
gdk_window_ensure_native (window);
display = gdk_window_get_display (window);
xproperty = gdk_x11_atom_to_xatom_for_display (display, property);
xtype = gdk_x11_atom_to_xatom_for_display (display, type);
xwindow = GDK_WINDOW_XID (window);
if (xtype == XA_ATOM ||
xtype == gdk_x11_get_xatom_by_name_for_display (display, "ATOM_PAIR"))
{
/*
* data is an array of GdkAtom, we need to convert it
* to an array of X Atoms
*/
gint i;
GdkAtom *atoms = (GdkAtom*) data;
Atom *xatoms;
xatoms = g_new (Atom, nelements);
for (i = 0; i < nelements; i++)
xatoms[i] = gdk_x11_atom_to_xatom_for_display (display, atoms[i]);
XChangeProperty (GDK_DISPLAY_XDISPLAY (display), xwindow,
xproperty, xtype,
format, mode, (guchar *)xatoms, nelements);
g_free (xatoms);
}
else
XChangeProperty (GDK_DISPLAY_XDISPLAY (display), xwindow, xproperty,
xtype, format, mode, (guchar *)data, nelements);
}
void
_gdk_x11_window_delete_property (GdkWindow *window,
GdkAtom property)
{
g_return_if_fail (!window || GDK_WINDOW_IS_X11 (window));
if (!window)
{
GdkScreen *screen = gdk_screen_get_default ();
window = gdk_screen_get_root_window (screen);
GDK_NOTE (MULTIHEAD,
g_message ("gdk_property_delete(): window is NULL\n"));
}
else if (!GDK_WINDOW_IS_X11 (window))
return;
if (GDK_WINDOW_DESTROYED (window))
return;
XDeleteProperty (GDK_WINDOW_XDISPLAY (window), GDK_WINDOW_XID (window),
gdk_x11_atom_to_xatom_for_display (GDK_WINDOW_DISPLAY (window),
property));
}
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