[gtk+/wip/frame-synchronization: 1/19] GdkDisplayX11: Don't use substructure events in internal accounting

[Owen Taylor <otaylor src gnome org>]

commit 251dd6b5243bfb26f88802aa4300a98e5a8f9f0c
Author: Owen W. Taylor <otaylor fishsoup net>
Date:   Tue Sep 18 22:13:06 2012 -0400

    GdkDisplayX11: Don't use substructure events in internal accounting
    
    We may receive events because SubstructureNotifyMask has been selected
    for the root window. (Most likely, this would occur because GTK+
    is being used inside a window manager like Metacity or Mutter.)
    This can confuse various types of internal accounting, so detect
    such events and comprehensively ignore them for GDK's internal
    purposes. We still need to generate GDK events for these cases
    because you can select for substructure events with
    GDK_SUBSTRUCTURE_MASK.

 gdk/x11/gdkdisplay-x11.c |  124 +++++++++++++++++++++++++++-------------------
 1 files changed, 73 insertions(+), 51 deletions(-)
---
diff --git a/gdk/x11/gdkdisplay-x11.c b/gdk/x11/gdkdisplay-x11.c
index 0f8b35f..1957798 100644
--- a/gdk/x11/gdkdisplay-x11.c
+++ b/gdk/x11/gdkdisplay-x11.c
@@ -382,15 +382,11 @@ gdk_check_wm_state_changed (GdkWindow *window)
     do_net_wm_state_changes (window);
 }
 
-static GdkWindow *
-get_event_window (GdkEventTranslator *translator,
-                  XEvent             *xevent)
+static Window
+get_event_xwindow (XEvent             *xevent)
 {
-  GdkDisplay *display;
   Window xwindow;
 
-  display = (GdkDisplay *) translator;
-
   switch (xevent->type)
     {
     case DestroyNotify:
@@ -405,11 +401,20 @@ get_event_window (GdkEventTranslator *translator,
     case ConfigureNotify:
       xwindow = xevent->xconfigure.window;
       break;
+    case ReparentNotify:
+      xwindow = xevent->xreparent.window;
+      break;
+    case GravityNotify:
+      xwindow = xevent->xgravity.window;
+      break;
+    case CirculateNotify:
+      xwindow = xevent->xcirculate.window;
+      break;
     default:
       xwindow = xevent->xany.window;
     }
 
-  return gdk_x11_window_lookup_for_display (display, xwindow);
+  return xwindow;
 }
 
 static gboolean
@@ -418,7 +423,9 @@ gdk_x11_display_translate_event (GdkEventTranslator *translator,
                                  GdkEvent           *event,
                                  XEvent             *xevent)
 {
+  Window xwindow;
   GdkWindow *window;
+  gboolean is_substructure;
   GdkWindowImplX11 *window_impl = NULL;
   GdkScreen *screen = NULL;
   GdkX11Screen *x11_screen = NULL;
@@ -426,12 +433,20 @@ gdk_x11_display_translate_event (GdkEventTranslator *translator,
   GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
   gboolean return_val;
 
-  /* Find the GdkWindow that this event relates to.
-   * Basically this means substructure events
-   * are reported same as structure events
+  /* Find the GdkWindow that this event relates to. If that's
+   * not the same as the window that the event was sent to,
+   * we are getting an event from SubstructureNotifyMask.
+   * We ignore such events for internal operation, but we
+   * need to report them to the application because of
+   * GDK_SUBSTRUCTURE_MASK (which should be removed at next
+   * opportunity.) The most likely reason for getting these
+   * events is when we are used in the Metacity or Mutter
+   * window managers.
    */
-  window = get_event_window (translator, xevent);
+  xwindow = get_event_xwindow (xevent);
+  is_substructure = xwindow != xevent->xany.window;
 
+  window = gdk_x11_window_lookup_for_display (display, xwindow);
   if (window)
     {
       /* We may receive events such as NoExpose/GraphicsExpose
@@ -460,7 +475,7 @@ gdk_x11_display_translate_event (GdkEventTranslator *translator,
 	}
     }
 
-  if (xevent->type == DestroyNotify)
+  if (xevent->type == DestroyNotify && !is_substructure)
     {
       int i, n;
 
@@ -622,8 +637,7 @@ gdk_x11_display_translate_event (GdkEventTranslator *translator,
 		g_message ("destroy notify:\twindow: %ld",
 			   xevent->xdestroywindow.window));
 
-      /* Ignore DestroyNotify from SubstructureNotifyMask */
-      if (xevent->xdestroywindow.window == xevent->xdestroywindow.event)
+      if (!is_substructure)
 	{
 	  event->any.type = GDK_DESTROY;
 	  event->any.window = window;
@@ -646,27 +660,29 @@ gdk_x11_display_translate_event (GdkEventTranslator *translator,
       event->any.type = GDK_UNMAP;
       event->any.window = window;
 
-      /* If the WM supports the _NET_WM_STATE_HIDDEN hint, we do not want to
-       * interpret UnmapNotify events as implying iconic state.
-       * http://bugzilla.gnome.org/show_bug.cgi?id=590726.
-       */
-      if (screen &&
-          !gdk_x11_screen_supports_net_wm_hint (screen,
-                                                gdk_atom_intern_static_string ("_NET_WM_STATE_HIDDEN")))
-        {
-          /* If we are shown (not withdrawn) and get an unmap, it means we were
-           * iconified in the X sense. If we are withdrawn, and get an unmap, it
-           * means we hid the window ourselves, so we will have already flipped
-           * the iconified bit off.
+      if (window && !is_substructure)
+	{
+          /* If the WM supports the _NET_WM_STATE_HIDDEN hint, we do not want to
+           * interpret UnmapNotify events as implying iconic state.
+           * http://bugzilla.gnome.org/show_bug.cgi?id=590726.
            */
-          if (window && GDK_WINDOW_IS_MAPPED (window))
-            gdk_synthesize_window_state (window,
-                                         0,
-                                         GDK_WINDOW_STATE_ICONIFIED);
-        }
+          if (screen &&
+              !gdk_x11_screen_supports_net_wm_hint (screen,
+                                                    gdk_atom_intern_static_string ("_NET_WM_STATE_HIDDEN")))
+            {
+              /* If we are shown (not withdrawn) and get an unmap, it means we were
+               * iconified in the X sense. If we are withdrawn, and get an unmap, it
+               * means we hid the window ourselves, so we will have already flipped
+               * the iconified bit off.
+               */
+              if (GDK_WINDOW_IS_MAPPED (window))
+                gdk_synthesize_window_state (window,
+                                             0,
+                                             GDK_WINDOW_STATE_ICONIFIED);
+            }
 
-      if (window)
-        _gdk_x11_window_grab_check_unmap (window, xevent->xany.serial);
+          _gdk_x11_window_grab_check_unmap (window, xevent->xany.serial);
+        }
 
       break;
 
@@ -678,11 +694,14 @@ gdk_x11_display_translate_event (GdkEventTranslator *translator,
       event->any.type = GDK_MAP;
       event->any.window = window;
 
-      /* Unset iconified if it was set */
-      if (window && (window->state & GDK_WINDOW_STATE_ICONIFIED))
-        gdk_synthesize_window_state (window,
-                                     GDK_WINDOW_STATE_ICONIFIED,
-                                     0);
+      if (window && !is_substructure)
+	{
+	  /* Unset iconified if it was set */
+	  if (window->state & GDK_WINDOW_STATE_ICONIFIED)
+	    gdk_synthesize_window_state (window,
+					 GDK_WINDOW_STATE_ICONIFIED,
+					 0);
+	}
 
       break;
 
@@ -728,7 +747,7 @@ gdk_x11_display_translate_event (GdkEventTranslator *translator,
         }
 
 #ifdef HAVE_XSYNC
-      if (toplevel && display_x11->use_sync && !XSyncValueIsZero (toplevel->pending_counter_value))
+      if (!is_substructure && toplevel && display_x11->use_sync && !XSyncValueIsZero (toplevel->pending_counter_value))
 	{
 	  toplevel->current_counter_value = toplevel->pending_counter_value;
 	  XSyncIntToValue (&toplevel->pending_counter_value, 0);
@@ -773,21 +792,24 @@ gdk_x11_display_translate_event (GdkEventTranslator *translator,
 	      event->configure.x = xevent->xconfigure.x;
 	      event->configure.y = xevent->xconfigure.y;
 	    }
-	  window->x = event->configure.x;
-	  window->y = event->configure.y;
-	  window->width = xevent->xconfigure.width;
-	  window->height = xevent->xconfigure.height;
+	  if (!is_substructure)
+	    {
+	      window->x = event->configure.x;
+	      window->y = event->configure.y;
+	      window->width = xevent->xconfigure.width;
+	      window->height = xevent->xconfigure.height;
 
-	  _gdk_window_update_size (window);
-	  _gdk_x11_window_update_size (GDK_WINDOW_IMPL_X11 (window->impl));
+	      _gdk_window_update_size (window);
+	      _gdk_x11_window_update_size (GDK_WINDOW_IMPL_X11 (window->impl));
 
-          if (window->resize_count >= 1)
-            {
-              window->resize_count -= 1;
+	      if (window->resize_count >= 1)
+		{
+		  window->resize_count -= 1;
 
-              if (window->resize_count == 0)
-                _gdk_x11_moveresize_configure_done (display, window);
-            }
+		  if (window->resize_count == 0)
+		    _gdk_x11_moveresize_configure_done (display, window);
+		}
+	    }
         }
       break;