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x11: Improve XGenericEventCookie data allocation

Browse Source 
https://bugzilla.gnome.org/show_bug.cgi?id=654656

Clutter may be used together with GTK+, which indirectly may use
XInput2 too, so the cookie data must persist when both are handling
events.

What happens now in a nutshell is, Clutter is only guaranteed to allocate
the cookie itself after XNextEvent(), and only frees the cookie if its
XGetEventData() call allocated the cookie data.

The X[Get|Free]EventData() calls happen now in clutter-event-x11.c as
hypothetically different event translators could also handle other set
of X Generic Events, or other libraries handling events for that matter.
This commit is contained in:
Carlos Garnacho 2011-07-14 21:58:25 +02:00
parent c6a0427c69
commit 075a4ed86c
3 changed files with 46 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
clutter/x11/clutter-device-manager-xi2.c
View File

@ -562,27 +562,21 @@ clutter_device_manager_xi2_translate_event (ClutterEventTranslator *translator,
cookie = &xevent->xcookie;
if (!XGetEventData (backend_x11->xdpy, cookie))
return CLUTTER_TRANSLATE_CONTINUE;
if (cookie->type != GenericEvent ||
cookie->extension != manager_xi2->opcode)
{
XFreeEventData (backend_x11->xdpy, cookie);
return CLUTTER_TRANSLATE_CONTINUE;
}
xi_event = (XIEvent *) cookie->data;
if (!xi_event)
return CLUTTER_TRANSLATE_REMOVE;
if (!(xi_event->evtype == XI_HierarchyChanged ||
xi_event->evtype == XI_DeviceChanged))
{
stage = get_event_stage (translator, xi_event);
if (stage == NULL || CLUTTER_ACTOR_IN_DESTRUCTION (stage))
{
XFreeEventData (backend_x11->xdpy, cookie);
return CLUTTER_TRANSLATE_CONTINUE;
}
else
stage_x11 = CLUTTER_STAGE_X11 (_clutter_stage_get_window (stage));
}
@ -902,8 +896,6 @@ clutter_device_manager_xi2_translate_event (ClutterEventTranslator *translator,
break;
}
XFreeEventData (backend_x11->xdpy, cookie);
return retval;
}

23
clutter/x11/clutter-event-x11.c
View File

@ -240,10 +240,17 @@ events_queue (ClutterBackend *backend)
event = clutter_event_new (CLUTTER_NOTHING);
#ifdef HAVE_XGE
XGetEventData (xdisplay, &xevent.xcookie);
#endif
if (_clutter_backend_translate_event (backend, &xevent, event))
_clutter_event_push (event, FALSE);
else
clutter_event_free (event);
#ifdef HAVE_XGE
XFreeEventData (xdisplay, &xevent.xcookie);
#endif
}
}
@ -273,8 +280,13 @@ clutter_x11_handle_event (XEvent *xevent)
{
ClutterX11FilterReturn result;
ClutterBackend *backend;
ClutterBackendX11 *backend_x11;
Display *xdisplay;
ClutterEvent *event;
gint spin = 1;
#ifdef HAVE_XGE
gboolean allocated_event;
#endif
/* The return values here are someone approximate; we return
* CLUTTER_X11_FILTER_REMOVE if a clutter event is
@ -290,9 +302,15 @@ clutter_x11_handle_event (XEvent *xevent)
clutter_threads_enter ();
backend = clutter_get_default_backend ();
backend_x11 = CLUTTER_BACKEND_X11 (backend);
xdisplay = backend_x11->xdpy;
event = clutter_event_new (CLUTTER_NOTHING);
#ifdef HAVE_XGE
allocated_event = XGetEventData (xdisplay, &xevent->xcookie);
#endif
if (_clutter_backend_translate_event (backend, xevent, event))
{
_clutter_event_push (event, FALSE);
@ -323,6 +341,11 @@ clutter_x11_handle_event (XEvent *xevent)
}
out:
#ifdef HAVE_XGE
if (allocated_event)
XFreeEventData (xdisplay, &xevent->xcookie);
#endif
clutter_threads_leave ();
return result;

18
configure.ac
View File

@ -592,6 +592,23 @@ AS_IF([test "x$SUPPORT_XLIB" = "x1"],
[AC_MSG_ERROR([not found])]
)
# X Generic Extensions (optional)
clutter_save_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS $X11_CFLAGS"
clutter_save_LIBS="$LIBS"
LIBS="$LIBS $X11_LIBS"
have_xge=no
AC_CHECK_FUNC([XGetEventData],
[
AC_DEFINE(HAVE_XGE, 1, [Define to 1 if X Generic Extensions is available])
have_xge=yes
])
CPPFLAGS="$clutter_save_CPPFLAGS"
LIBS="$clutter_save_LIBS"
# XI (optional)
AC_ARG_ENABLE([xinput],
[AS_HELP_STRING([--enable-xinput], [Use the XI X extension])],
@ -1020,6 +1037,7 @@ fi
if test "x$SUPPORT_XLIB" = "x1"; then
echo " Enable XComposite: ${have_xcomposite}"
echo " Enable XInput: ${have_xinput}"
echo " Enable Xge: ${have_xge}"
echo " Enable XI2: ${have_xinput2}"
echo " Enable XKB: ${have_xkb}"
echo " Enable X11 tests: ${x11_tests}"