gboolean
gdk_property_get (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_drawable_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_XWINDOW (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;
}
static void
read_settings (GdkX11Screen *x11_screen,
gboolean do_notify)
{
GdkScreen *screen = GDK_SCREEN (x11_screen);
Atom type;
int format;
unsigned long n_items;
unsigned long bytes_after;
unsigned char *data;
int result;
GHashTable *old_list = x11_screen->xsettings;
GValue value = G_VALUE_INIT;
GValue *setting, *copy;
x11_screen->xsettings = NULL;
if (x11_screen->xsettings_manager_window)
{
GdkDisplay *display = x11_screen->display;
Atom xsettings_atom = gdk_x11_get_xatom_by_name_for_display (display, "_XSETTINGS_SETTINGS");
gdk_x11_display_error_trap_push (display);
result = XGetWindowProperty (gdk_x11_display_get_xdisplay (display),
gdk_x11_window_get_xid (x11_screen->xsettings_manager_window),
xsettings_atom, 0, LONG_MAX,
False, xsettings_atom,
&type, &format, &n_items, &bytes_after, &data);
gdk_x11_display_error_trap_pop_ignored (display);
if (result == Success && type != None)
{
if (type != xsettings_atom)
{
g_warning ("Invalid type for XSETTINGS property: %s", gdk_x11_get_xatom_name_for_display (display, type));
}
else if (format != 8)
{
g_warning ("Invalid format for XSETTINGS property: %d", format);
}
else
x11_screen->xsettings = parse_settings (data, n_items);
XFree (data);
}
}
/* Since we support scaling we look at the specific Gdk/UnscaledDPI
setting if it exists and use that instead of Xft/DPI if it is set */
if (x11_screen->xsettings && !x11_screen->fixed_window_scale)
{
setting = g_hash_table_lookup (x11_screen->xsettings, "gdk-unscaled-dpi");
if (setting)
{
copy = g_new0 (GValue, 1);
g_value_init (copy, G_VALUE_TYPE (setting));
g_value_copy (setting, copy);
g_hash_table_insert (x11_screen->xsettings,
"gtk-xft-dpi", copy);
}
}
if (do_notify)
notify_changes (x11_screen, old_list);
if (old_list)
g_hash_table_unref (old_list);
g_value_init (&value, G_TYPE_INT);
if (!screen->resolution_set)
{
/* This code is duplicated with gtksettings.c:settings_update_resolution().
* The update of the screen resolution needs to happen immediately when
* gdk_x11_display_set_window_scale() is called, and not wait for events
* to be processed, so we can't always handling it in gtksettings.c.
* But we can't always handle it here because the DPI can be set through
* GtkSettings, which we don't have access to.
*/
int dpi_int = 0;
double dpi;
const char *scale_env;
double scale;
if (gdk_screen_get_setting (GDK_SCREEN (x11_screen),
"gtk-xft-dpi", &value))
dpi_int = g_value_get_int (&value);
if (dpi_int > 0)
dpi = dpi_int / 1024.;
else
dpi = -1.;
scale_env = g_getenv ("GDK_DPI_SCALE");
if (scale_env)
{
scale = g_ascii_strtod (scale_env, NULL);
if (scale != 0 && dpi > 0)
dpi *= scale;
}
_gdk_screen_set_resolution (screen, dpi);
}
if (!x11_screen->fixed_window_scale &&
gdk_screen_get_setting (GDK_SCREEN (x11_screen),
"gdk-window-scaling-factor", &value))
_gdk_x11_screen_set_window_scale (x11_screen,
g_value_get_int (&value));
}
