gdk: Drop expose events

Replace expose events with a GdkSurface::expose signal.
This is part of the move to use events only for input.

gdk/gdkevents.c

@@ -646,11 +646,6 @@ gdk_event_copy (const GdkEvent *event)
       g_object_ref (event->dnd.drop);
       break;
 
-    case GDK_EXPOSE:
-      if (event->expose.region)
-        new_event->expose.region = cairo_region_copy (event->expose.region);
-      break;
-
     case GDK_BUTTON_PRESS:
     case GDK_BUTTON_RELEASE:
       if (event->button.axes)
@@ -730,11 +725,6 @@ gdk_event_finalize (GObject *object)
       g_free (event->touch.axes);
       break;
 
-    case GDK_EXPOSE:
-      if (event->expose.region)
-	cairo_region_destroy (event->expose.region);
-      break;
-      
     case GDK_MOTION_NOTIFY:
       g_clear_object (&event->motion.tool);
       g_free (event->motion.axes);
@@ -831,7 +821,6 @@ gdk_event_get_time (const GdkEvent *event)
       case GDK_NOTHING:
       case GDK_DELETE:
       case GDK_DESTROY:
-      case GDK_EXPOSE:
       case GDK_MAP:
       case GDK_UNMAP:
       case GDK_GRAB_BROKEN:
@@ -906,7 +895,6 @@ gdk_event_get_state (const GdkEvent  *event,
       case GDK_NOTHING:
       case GDK_DELETE:
       case GDK_DESTROY:
-      case GDK_EXPOSE:
       case GDK_MAP:
       case GDK_UNMAP:
       case GDK_GRAB_BROKEN:

gdk/gdkevents.h

@@ -104,7 +104,6 @@ G_BEGIN_DECLS
 
 
 typedef struct _GdkEventAny	    GdkEventAny;
-typedef struct _GdkEventExpose	    GdkEventExpose;
 typedef struct _GdkEventMotion	    GdkEventMotion;
 typedef struct _GdkEventButton	    GdkEventButton;
 typedef struct _GdkEventTouch       GdkEventTouch;
@@ -144,8 +143,6 @@ typedef void (*GdkEventFunc) (GdkEvent *event,
  *   hidden or destroyed, usually when the user clicks on a special icon in the
  *   title bar.
  * @GDK_DESTROY: the surface has been destroyed.
- * @GDK_EXPOSE: all or part of the surface has become visible and needs to be
- *   redrawn.
  * @GDK_MOTION_NOTIFY: the pointer (usually a mouse) has moved.
  * @GDK_BUTTON_PRESS: a mouse button has been pressed.
  * @GDK_BUTTON_RELEASE: a mouse button has been released.
@@ -203,7 +200,6 @@ typedef enum
   GDK_NOTHING,
   GDK_DELETE,
   GDK_DESTROY,
-  GDK_EXPOSE,
   GDK_MOTION_NOTIFY,
   GDK_BUTTON_PRESS,
   GDK_BUTTON_RELEASE,

gdk/gdkeventsprivate.h

@@ -63,23 +63,6 @@ struct _GdkEventAny
   GdkDisplay *display;
 };
 
-/*
- * GdkEventExpose:
- * @type: the type of the event (%GDK_EXPOSE)
- * @surface: the surface which received the event.
- * @send_event: %TRUE if the event was sent explicitly.
- * @area: bounding box of @region.
- * @region: the region that needs to be redrawn.
- *
- * Generated when all or part of a surface becomes visible and needs to be
- * redrawn.
- */
-struct _GdkEventExpose
-{
-  GdkEventAny any;
-  cairo_region_t *region;
-};
-
 /*
  * GdkEventMotion:
  * @type: the type of the event.
@@ -573,7 +556,6 @@ struct _GdkEventPadGroupMode {
  * GdkEvent:
  * @type: the #GdkEventType
  * @any: a #GdkEventAny
- * @expose: a #GdkEventExpose
  * @motion: a #GdkEventMotion
  * @button: a #GdkEventButton
  * @touch: a #GdkEventTouch
@@ -624,7 +606,6 @@ struct _GdkEventPadGroupMode {
 union _GdkEvent
 {
   GdkEventAny		    any;
-  GdkEventExpose	    expose;
   GdkEventMotion	    motion;
   GdkEventButton	    button;
   GdkEventTouch             touch;

gdk/gdksurface.c

@@ -98,6 +98,7 @@
 enum {
   MOVED_TO_RECT,
   SIZE_CHANGED,
+  RENDER,
   LAST_SIGNAL
 };
 
@@ -324,6 +325,18 @@ gdk_surface_class_init (GdkSurfaceClass *klass)
                   2,
                   G_TYPE_INT,
                   G_TYPE_INT);
+
+  signals[RENDER] =
+    g_signal_new (g_intern_static_string ("render"),
+                  G_OBJECT_CLASS_TYPE (object_class),
+                  G_SIGNAL_RUN_LAST,
+                  0,
+                  g_signal_accumulator_true_handled,
+                  NULL,
+                  NULL,
+                  G_TYPE_BOOLEAN,
+                  1,
+                  CAIRO_GOBJECT_TYPE_REGION);
 }
 
 static void
@@ -1631,20 +1644,13 @@ static void
 gdk_surface_process_updates_recurse (GdkSurface *surface,
                                      cairo_region_t *expose_region)
 {
-  GdkEvent *event;
+  gboolean handled;
 
   if (surface->destroyed)
     return;
 
   /* Paint the surface before the children, clipped to the surface region */
-
-  event = gdk_event_new (GDK_EXPOSE);
-  event->any.surface = g_object_ref (surface);
-  event->any.send_event = FALSE;
-  event->expose.region = cairo_region_reference (expose_region);
-
-  _gdk_event_emit (event);
-  g_object_unref (event);
+  g_signal_emit (surface, signals[RENDER], 0, expose_region, &handled);
 }
 
 /* Process and remove any invalid area on the native surface by creating
@@ -3937,7 +3943,6 @@ _gdk_make_event (GdkSurface    *surface,
     case GDK_UNMAP:
     case GDK_DELETE:
     case GDK_DESTROY:
-    case GDK_EXPOSE:
     default:
       break;
     }

gtk/gtkmain.c

@@ -1827,11 +1827,6 @@ gtk_main_do_event (GdkEvent *event)
         }
       break;
 
-    case GDK_EXPOSE:
-      if (event->any.surface)
-        gtk_widget_render (event_widget, event->any.surface, event->expose.region);
-      break;
-
     case GDK_MAP:
       if (GTK_IS_WINDOW (event_widget) && !_gtk_widget_get_mapped (event_widget))
         {

gtk/gtkwidget.c

@@ -5091,14 +5091,6 @@ gtk_widget_event (GtkWidget       *widget,
   g_return_val_if_fail (GTK_IS_WIDGET (widget), TRUE);
   g_return_val_if_fail (WIDGET_REALIZED_FOR_EVENT (widget, event), TRUE);
 
-  if (event->any.type == GDK_EXPOSE)
-    {
-      g_warning ("Events of type GDK_EXPOSE cannot be synthesized. To get "
-		 "the same effect, call gdk_surface_invalidate_rect/region(), "
-		 "followed by gdk_surface_process_updates().");
-      return TRUE;
-    }
-
   return gtk_widget_event_internal (widget, event);
 }
 
@@ -5174,14 +5166,6 @@ _gtk_widget_captured_event (GtkWidget      *widget,
   g_return_val_if_fail (GTK_IS_WIDGET (widget), TRUE);
   g_return_val_if_fail (WIDGET_REALIZED_FOR_EVENT (widget, event), TRUE);
 
-  if (event->any.type == GDK_EXPOSE)
-    {
-      g_warning ("Events of type GDK_EXPOSE cannot be synthesized. To get "
-		 "the same effect, call gdk_surface_invalidate_rect/region(), "
-		 "followed by gdk_surface_process_updates().");
-      return TRUE;
-    }
-
   if (!event_surface_is_still_viewable (event))
     return TRUE;
 
@@ -5217,7 +5201,6 @@ event_surface_is_still_viewable (const GdkEvent *event)
    */
   switch ((guint) event->any.type)
     {
-    case GDK_EXPOSE:
     case GDK_MOTION_NOTIFY:
     case GDK_BUTTON_PRESS:
     case GDK_KEY_PRESS:
@@ -5284,7 +5267,6 @@ gtk_widget_event_internal (GtkWidget      *widget,
   /* Non input events get handled right away */
   switch ((guint) event->any.type)
     {
-    case GDK_EXPOSE:
     case GDK_NOTHING:
     case GDK_DELETE:
     case GDK_DESTROY:
@@ -11512,6 +11494,16 @@ gtk_widget_set_surface (GtkWidget *widget,
     }
 }
 
+static gboolean
+surface_expose (GdkSurface     *surface,
+                cairo_region_t *region,
+                GtkWidget      *widget)
+{
+  gtk_widget_render (widget, surface, region);
+
+  return TRUE;
+}
+
 /**
  * gtk_widget_register_surface:
  * @widget: a #GtkWidget
@@ -11539,6 +11531,8 @@ gtk_widget_register_surface (GtkWidget    *widget,
   g_assert (user_data == NULL);
 
   gdk_surface_set_user_data (surface, widget);
+
+  g_signal_connect (surface, "render", G_CALLBACK (surface_expose), widget);
 }
 
 /**
@@ -11562,6 +11556,8 @@ gtk_widget_unregister_surface (GtkWidget    *widget,
   gdk_surface_get_user_data (surface, &user_data);
   g_assert (user_data == widget);
   gdk_surface_set_user_data (surface, NULL);
+
+  g_signal_handlers_disconnect_by_func (surface, surface_expose, widget);
 }
 
 /**