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device-manager-xi2: Fix core pointer retrieval race 

The core pointer concept doesn't really exist anymore in an XI2 world,
so the clutter API is a bit of a mismatch with what X provides. Using
XIGetClientPointer doesn't really help, as far as i can tell the
semantics of XIGetClientPointer are essentially: Whatever the X server
picked when it had to reply with device-dependant data to a query
without a device specifier. Not very useful...

To make matters worse, whether XIGetClientPointer returns a valid
pointer depends on whether there has been a query that forced it to pick
one in the first place, making the whole thing pretty non-deterministic.

This patch changes things around such that instead of using
XIGetClientPointer to determine the core pointer, we simply pick the
first master pointer device. In practise this will essentially always
be the X virtual core pointer.

https://bugzilla.gnome.org/show_bug.cgi?id=729462
This commit is contained in:
Sjoerd Simons 2014-12-15 17:29:52 +00:00 committed by Emmanuele Bassi
parent 5281425a53
commit 1be019852f
2 changed files with 17 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
clutter/x11/clutter-device-manager-xi2.c
View File

@ -222,21 +222,6 @@ is_touch_device (XIAnyClassInfo **classes,
return FALSE;
}
static void
update_client_pointer (ClutterDeviceManagerXI2 *manager_xi2)
{
ClutterBackendX11 *backend_x11;
int device_id;
backend_x11 =
CLUTTER_BACKEND_X11 (_clutter_device_manager_get_backend (CLUTTER_DEVICE_MANAGER (manager_xi2)));
XIGetClientPointer (backend_x11->xdpy, None, &device_id);
manager_xi2->client_pointer = g_hash_table_lookup (manager_xi2->devices_by_id,
GINT_TO_POINTER (device_id));
}
static ClutterInputDevice *
create_device (ClutterDeviceManagerXI2 *manager_xi2,
ClutterBackendX11 *backend_x11,
@ -816,7 +801,6 @@ clutter_device_manager_xi2_translate_event (ClutterEventTranslator *translator,
XIHierarchyEvent *xev = (XIHierarchyEvent *) xi_event;
translate_hierarchy_event (backend_x11, manager_xi2, xev);
update_client_pointer (manager_xi2);
}
retval = CLUTTER_TRANSLATE_REMOVE;
break;
@ -840,8 +824,6 @@ clutter_device_manager_xi2_translate_event (ClutterEventTranslator *translator,
if (source_device)
_clutter_input_device_reset_scroll_info (source_device);
update_client_pointer (manager_xi2);
}
retval = CLUTTER_TRANSLATE_REMOVE;
break;
@ -1391,17 +1373,29 @@ clutter_device_manager_xi2_get_core_device (ClutterDeviceManager *manager,
ClutterInputDeviceType device_type)
{
ClutterDeviceManagerXI2 *manager_xi2 = CLUTTER_DEVICE_MANAGER_XI2 (manager);
ClutterInputDevice *pointer = NULL;
GList *l;
for (l = manager_xi2->master_devices; l != NULL ; l = l->next)
{
ClutterInputDevice *device = l->data;
if (clutter_input_device_get_device_type (device) == CLUTTER_POINTER_DEVICE)
{
pointer = device;
break;
}
}
if (pointer == NULL)
return NULL;
switch (device_type)
{
case CLUTTER_POINTER_DEVICE:
if (manager_xi2->client_pointer == NULL)
update_client_pointer (manager_xi2);
return manager_xi2->client_pointer;
return pointer;
case CLUTTER_KEYBOARD_DEVICE:
return clutter_input_device_get_associated_device (manager_xi2->client_pointer);
return clutter_input_device_get_associated_device (pointer);
default:
break;
@ -1505,7 +1499,6 @@ clutter_device_manager_xi2_constructed (GObject *gobject)
&event_mask);
XSync (backend_x11->xdpy, False);
update_client_pointer (manager_xi2);
if (G_OBJECT_CLASS (clutter_device_manager_xi2_parent_class)->constructed)
G_OBJECT_CLASS (clutter_device_manager_xi2_parent_class)->constructed (gobject);

2
clutter/x11/clutter-device-manager-xi2.h
View File

@ -49,8 +49,6 @@ struct _ClutterDeviceManagerXI2
GList *master_devices;
GList *slave_devices;
ClutterInputDevice *client_pointer;
int opcode;
};