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[mutter] Always map the client and frame windows

commit 7cdf55871ec92763600a2a6da6dece92ac3dadd4
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Sat Feb 1 19:06:51 2014 -0500

    Always map the client and frame windows
    
    Traditionally, WMs unmap windows when minimizing them, and map them
    when restoring them or wanting to show them for other reasons, like
    upon creation.
    
    However, as metacity morphed into mutter, we optionally chose to keep
    windows mapped for the lifetime of the window under the user option
    "live-window-previews", which makes the code keep windows mapped so it
    can show window preview for minimized windows in other places, like
    Alt-Tab and Expose.
    
    I removed this preference two years ago mechanically, by removing all
    the if statements, but never went through and cleaned up the code so
    that windows are simply mapped for the lifetime of the window -- the
    "architecture" of the old code that maps and unmaps on show/hide was
    still there.
    
    Remove this now.
    
    The one case we still need to be careful of is shaded windows, in which
    we do still unmap the client window. In the future, we might want to
    show previews of shaded windows in the overview and Alt-Tab. In that
    we'd also keep shaded windows mapped, and could remove all unmap logic,
    but we'd need a more complex method of showing the shaded titlebar, such
    as using a different actor.
    
    At the same time, simplify the compositor interface by removing
    meta_compositor_window_[un]mapped API, and instead adding/removing the
    window on-demand.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=720631

 doc/reference/meta-sections.txt    |    2 -
 src/compositor/compositor.c        |   33 ------
 src/compositor/meta-window-actor.c |   54 +---------
 src/core/display.c                 |    2 +-
 src/core/frame.c                   |    3 +-
 src/core/frame.h                   |    1 -
 src/core/window.c                  |  197 ++++++++----------------------------
 src/meta/compositor.h              |   13 +--
 src/meta/window.h                  |    2 -
 9 files changed, 54 insertions(+), 253 deletions(-)
---
diff --git a/doc/reference/meta-sections.txt b/doc/reference/meta-sections.txt
index 7aa8931..22d4350 100644
--- a/doc/reference/meta-sections.txt
+++ b/doc/reference/meta-sections.txt
@@ -96,8 +96,6 @@ meta_compositor_hide_window
 meta_compositor_switch_workspace
 meta_compositor_maximize_window
 meta_compositor_unmaximize_window
-meta_compositor_window_mapped
-meta_compositor_window_unmapped
 meta_compositor_sync_window_geometry
 meta_compositor_set_updates_frozen
 meta_compositor_queue_frame_drawn
diff --git a/src/compositor/compositor.c b/src/compositor/compositor.c
index 1e5d58d..e967708 100644
--- a/src/compositor/compositor.c
+++ b/src/compositor/compositor.c
@@ -42,15 +42,6 @@
  * the call, so it may be necessary to readjust the display based on the
  * old_rect to start the animation.
  *
- * meta_compositor_window_mapped() and meta_compositor_window_unmapped() are
- * notifications when the toplevel window (frame or client window) is mapped or
- * unmapped. That is, when the result of meta_window_toplevel_is_mapped()
- * changes. The main use of this is to drop resources when a window is unmapped.
- * A window will always be mapped before meta_compositor_show_window()
- * is called and will not be unmapped until after meta_compositor_hide_window()
- * is called. If the live_hidden_windows preference is set, windows will never
- * be unmapped.
- *
  * # Containers #
  *
  * There's two containers in the stage that are used to place window actors, here
@@ -1273,30 +1264,6 @@ meta_compositor_sync_stack (MetaCompositor  *compositor,
 }
 
 void
-meta_compositor_window_mapped (MetaCompositor *compositor,
-                               MetaWindow     *window)
-{
-  MetaWindowActor *window_actor = META_WINDOW_ACTOR (meta_window_get_compositor_private (window));
-  DEBUG_TRACE ("meta_compositor_window_mapped\n");
-  if (!window_actor)
-    return;
-
-  meta_window_actor_mapped (window_actor);
-}
-
-void
-meta_compositor_window_unmapped (MetaCompositor *compositor,
-                                 MetaWindow     *window)
-{
-  MetaWindowActor *window_actor = META_WINDOW_ACTOR (meta_window_get_compositor_private (window));
-  DEBUG_TRACE ("meta_compositor_window_unmapped\n");
-  if (!window_actor)
-    return;
-
-  meta_window_actor_unmapped (window_actor);
-}
-
-void
 meta_compositor_sync_window_geometry (MetaCompositor *compositor,
                                      MetaWindow *window,
                                       gboolean did_placement)
diff --git a/src/compositor/meta-window-actor.c b/src/compositor/meta-window-actor.c
index 8fb621f..cd93a0c 100644
--- a/src/compositor/meta-window-actor.c
+++ b/src/compositor/meta-window-actor.c
@@ -102,7 +102,6 @@ struct _MetaWindowActorPrivate
   GList            *frames;
 
   guint                    visible                : 1;
-  guint                    mapped                 : 1;
   guint                    argb32                 : 1;
   guint                    disposed               : 1;
   guint             redecorating           : 1;
@@ -890,7 +889,7 @@ meta_window_actor_damage_all (MetaWindowActor *self)
 
   texture = meta_shaped_texture_get_texture (META_SHAPED_TEXTURE (priv->actor));
 
-  if (!priv->mapped || priv->needs_pixmap)
+  if (priv->needs_pixmap)
     return;
 
   update_area (self, 0, 0, cogl_texture_get_width (texture), cogl_texture_get_height (texture));
@@ -966,7 +965,7 @@ meta_window_actor_queue_frame_drawn (MetaWindowActor *self,
         {
           queue_send_frame_messages_timeout (self);
         }
-      else if (priv->mapped && !priv->needs_pixmap)
+      else
         {
           const cairo_rectangle_int_t clip = { 0, 0, 1, 1 };
           clutter_actor_queue_redraw_with_clip (priv->actor, &clip);
@@ -998,9 +997,6 @@ meta_window_actor_queue_create_pixmap (MetaWindowActor *self)
 
   priv->needs_pixmap = TRUE;
 
-  if (!priv->mapped)
-    return;
-
   if (is_frozen (self))
     return;
 
@@ -1096,9 +1092,6 @@ meta_window_actor_after_effects (MetaWindowActor *self)
   meta_window_actor_sync_visibility (self);
   meta_window_actor_sync_actor_geometry (self, FALSE);
 
-  if (!meta_window_is_mapped (priv->window))
-    meta_window_actor_detach (self);
-
   if (priv->needs_pixmap)
     clutter_actor_queue_redraw (priv->actor);
 }
@@ -1515,9 +1508,7 @@ meta_window_actor_new (MetaWindow *window)
   priv->last_width = -1;
   priv->last_height = -1;
 
-  priv->mapped = meta_window_toplevel_is_mapped (priv->window);
-  if (priv->mapped)
-    meta_window_actor_queue_create_pixmap (self);
+  meta_window_actor_queue_create_pixmap (self);
 
   meta_window_actor_set_updates_frozen (self,
                                         meta_window_updates_are_frozen (priv->window));
@@ -1552,34 +1543,6 @@ meta_window_actor_new (MetaWindow *window)
   return self;
 }
 
-void
-meta_window_actor_mapped (MetaWindowActor *self)
-{
-  MetaWindowActorPrivate *priv = self->priv;
-
-  g_return_if_fail (!priv->mapped);
-
-  priv->mapped = TRUE;
-
-  meta_window_actor_queue_create_pixmap (self);
-}
-
-void
-meta_window_actor_unmapped (MetaWindowActor *self)
-{
-  MetaWindowActorPrivate *priv = self->priv;
-
-  g_return_if_fail (priv->mapped);
-
-  priv->mapped = FALSE;
-
-  if (meta_window_actor_effect_in_progress (self))
-    return;
-
-  meta_window_actor_detach (self);
-  priv->needs_pixmap = FALSE;
-}
-
 #if 0
 /* Print out a region; useful for debugging */
 static void
@@ -1706,9 +1669,6 @@ check_needs_pixmap (MetaWindowActor *self)
   if (!priv->needs_pixmap)
     return;
 
-  if (!priv->mapped)
-    return;
-
   if (xwindow == meta_screen_get_xroot (screen) ||
       xwindow == clutter_x11_get_stage_window (CLUTTER_STAGE (info->stage)))
     return;
@@ -1788,9 +1748,6 @@ check_needs_shadow (MetaWindowActor *self)
   gboolean should_have_shadow;
   gboolean appears_focused;
 
-  if (!priv->mapped)
-    return;
-
   /* Calling meta_window_actor_has_shadow() here at every pre-paint is cheap
    * and avoids the need to explicitly handle window type changes, which
    * we would do if tried to keep track of when we might be adding or removing
@@ -1894,7 +1851,7 @@ meta_window_actor_process_damage (MetaWindowActor    *self,
       return;
     }
 
-  if (!priv->mapped || priv->needs_pixmap)
+  if (priv->needs_pixmap)
     return;
 
   update_area (self, event->area.x, event->area.y, event->area.width, event->area.height);
@@ -2165,9 +2122,6 @@ check_needs_reshape (MetaWindowActor *self)
   MetaFrameBorders borders;
   cairo_rectangle_int_t client_area;
 
-  if (!priv->mapped)
-    return;
-
   if (!priv->needs_reshape)
     return;
 
diff --git a/src/core/display.c b/src/core/display.c
index cfc30ee..796bca7 100644
--- a/src/core/display.c
+++ b/src/core/display.c
@@ -2746,7 +2746,7 @@ event_callback (XEvent   *event,
 
               if (display->grab_op != META_GRAB_OP_NONE &&
                   display->grab_window == window &&
-                  ((window->frame == NULL) || !window->frame->mapped))
+                  window->frame == NULL)
                 meta_display_end_grab_op (display, timestamp);
       
               if (!frame_was_receiver)
diff --git a/src/core/frame.c b/src/core/frame.c
index 3dda576..ed7e3cb 100644
--- a/src/core/frame.c
+++ b/src/core/frame.c
@@ -61,7 +61,6 @@ meta_window_ensure_frame (MetaWindow *window)
   frame->right_width = 0;
   frame->current_cursor = 0;
 
-  frame->mapped = FALSE;
   frame->is_flashing = FALSE;
   frame->borders_cached = FALSE;
   
@@ -153,6 +152,8 @@ meta_window_ensure_frame (MetaWindow *window)
 
   /* Move keybindings to frame instead of window */
   meta_window_grab_keys (window);
+
+  meta_ui_map_frame (frame->window->screen->ui, frame->xwindow);
 }
 
 void
diff --git a/src/core/frame.h b/src/core/frame.h
index 0f1ebea..8ac1c26 100644
--- a/src/core/frame.h
+++ b/src/core/frame.h
@@ -47,7 +47,6 @@ struct _MetaFrame
   int right_width;
   int bottom_height;
 
-  guint mapped : 1;
   guint need_reapply_frame_shape : 1;
   guint is_flashing : 1; /* used by the visual bell flash */
   guint borders_cached : 1;
diff --git a/src/core/window.c b/src/core/window.c
index 8c518e7..92d4c39 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -776,6 +776,35 @@ meta_window_should_attach_to_parent (MetaWindow *window)
     }
 }
 
+static gboolean
+client_window_should_be_mapped (MetaWindow *window)
+{
+  return !window->shaded;
+}
+
+static void
+sync_client_window_mapped (MetaWindow *window)
+{
+  gboolean should_be_mapped = client_window_should_be_mapped (window);
+
+  if (window->mapped == should_be_mapped)
+    return;
+
+  window->mapped = should_be_mapped;
+
+  meta_error_trap_push (window->display);
+  if (should_be_mapped)
+    {
+      XMapWindow (window->display->xdisplay, window->xwindow);
+    }
+  else
+    {
+      XUnmapWindow (window->display->xdisplay, window->xwindow);
+      window->unmaps_pending ++;
+    }
+  meta_error_trap_pop (window->display);
+}
+
 MetaWindow*
 meta_window_new (MetaDisplay   *display,
                  Window         xwindow,
@@ -1425,6 +1454,8 @@ meta_window_new (MetaDisplay   *display,
   /* disable show desktop mode unless we're a desktop component */
   maybe_leave_show_desktop_mode (window);
 
+  sync_client_window_mapped (window);
+
   meta_window_queue (window, META_QUEUE_CALC_SHOWING);
   /* See bug 303284; a transient of the given window can already exist, in which
    * case we think it should probably be shown.
@@ -2229,6 +2260,8 @@ implement_showing (MetaWindow *window,
   meta_verbose ("Implement showing = %d for window %s\n",
                 showing, window->desc);
 
+  sync_client_window_mapped (window);
+
   if (!showing)
     {
       /* When we manage a new window, we normally delay placing it
@@ -2817,94 +2850,6 @@ window_would_be_covered (const MetaWindow *newbie)
   return FALSE; /* none found */
 }
 
-static gboolean
-map_frame (MetaWindow *window)
-{
-  if (window->frame && !window->frame->mapped)
-    {
-      meta_topic (META_DEBUG_WINDOW_STATE,
-                  "Frame actually needs map\n");
-      window->frame->mapped = TRUE;
-      meta_ui_map_frame (window->screen->ui, window->frame->xwindow);
-      return TRUE;
-    }
-  else
-    return FALSE;
-}
-
-static gboolean
-map_client_window (MetaWindow *window)
-{
-  if (!window->mapped)
-    {
-      meta_topic (META_DEBUG_WINDOW_STATE,
-                  "%s actually needs map\n", window->desc);
-      window->mapped = TRUE;
-      meta_error_trap_push (window->display);
-      XMapWindow (window->display->xdisplay, window->xwindow);
-      meta_error_trap_pop (window->display);
-
-      return TRUE;
-    }
-  else
-    return FALSE;
-}
-
-static gboolean
-unmap_client_window (MetaWindow *window,
-                     const char *reason)
-{
-  if (window->mapped)
-    {
-      meta_topic (META_DEBUG_WINDOW_STATE,
-                  "%s actually needs unmap%s\n",
-                  window->desc, reason);
-      meta_topic (META_DEBUG_WINDOW_STATE,
-                  "Incrementing unmaps_pending on %s%s\n",
-                  window->desc, reason);
-      window->mapped = FALSE;
-      window->unmaps_pending += 1;
-      meta_error_trap_push (window->display);
-      XUnmapWindow (window->display->xdisplay, window->xwindow);
-      meta_error_trap_pop (window->display);
-
-      return TRUE;
-    }
-  else
-    return FALSE;
-}
-
-/**
- * meta_window_is_mapped:
- * @window: a #MetaWindow
- *
- * Determines whether the X window for the MetaWindow is mapped.
- */
-gboolean
-meta_window_is_mapped (MetaWindow  *window)
-{
-  return window->mapped;
-}
-
-/**
- * meta_window_toplevel_is_mapped:
- * @window: a #MetaWindow
- *
- * Determines whether the toplevel X window for the MetaWindow is
- * mapped. (The frame window is mapped even without the client window
- * when a window is shaded.)
- *
- * Return Value: %TRUE if the toplevel is mapped.
- */
-gboolean
-meta_window_toplevel_is_mapped (MetaWindow *window)
-{
-  /* The frame is mapped but not the client window when the window
-   * is shaded.
-   */
-  return window->mapped || (window->frame && window->frame->mapped);
-}
-
 static void
 meta_window_force_placement (MetaWindow *window)
 {
@@ -2943,16 +2888,12 @@ meta_window_show (MetaWindow *window)
   gboolean place_on_top_on_map;
   gboolean needs_stacking_adjustment;
   MetaWindow *focus_window;
-  gboolean toplevel_was_mapped;
-  gboolean toplevel_now_mapped;
   gboolean notify_demands_attention = FALSE;
 
   meta_topic (META_DEBUG_WINDOW_STATE,
               "Showing window %s, shaded: %d iconic: %d placed: %d\n",
               window->desc, window->shaded, window->iconic, window->placed);
 
-  toplevel_was_mapped = meta_window_toplevel_is_mapped (window);
-
   focus_window = window->display->focus_window;  /* May be NULL! */
   did_show = FALSE;
   window_state_on_map (window, &takes_focus_on_map, &place_on_top_on_map);
@@ -3079,46 +3020,18 @@ meta_window_show (MetaWindow *window)
         }
     }
 
-  /* Shaded means the frame is mapped but the window is not */
-
-  if (map_frame (window))
-    did_show = TRUE;
-
-  if (window->shaded)
+  if (window->hidden)
     {
-      unmap_client_window (window, " (shading)");
-
-      if (!window->iconic)
-        {
-          window->iconic = TRUE;
-          set_wm_state (window);
-        }
-    }
-  else
-    {
-      if (map_client_window (window))
-        did_show = TRUE;
-
-      if (window->hidden)
-        {
-          meta_stack_freeze (window->screen->stack);
-          window->hidden = FALSE;
-          meta_stack_thaw (window->screen->stack);
-          did_show = TRUE;
-        }
-
-      if (window->iconic)
-        {
-          window->iconic = FALSE;
-          set_wm_state (window);
-        }
+      meta_stack_freeze (window->screen->stack);
+      window->hidden = FALSE;
+      meta_stack_thaw (window->screen->stack);
+      did_show = TRUE;
     }
 
-  toplevel_now_mapped = meta_window_toplevel_is_mapped (window);
-  if (toplevel_now_mapped != toplevel_was_mapped)
+  if (window->iconic)
     {
-      if (window->display->compositor)
-        meta_compositor_window_mapped (window->display->compositor, window);
+      window->iconic = FALSE;
+      set_wm_state (window);
     }
 
   if (!window->visible_to_compositor)
@@ -3207,14 +3120,10 @@ static void
 meta_window_hide (MetaWindow *window)
 {
   gboolean did_hide;
-  gboolean toplevel_was_mapped;
-  gboolean toplevel_now_mapped;
 
   meta_topic (META_DEBUG_WINDOW_STATE,
               "Hiding window %s\n", window->desc);
 
-  toplevel_was_mapped = meta_window_toplevel_is_mapped (window);
-
   if (window->visible_to_compositor)
     {
       window->visible_to_compositor = FALSE;
@@ -3235,19 +3144,12 @@ meta_window_hide (MetaWindow *window)
               break;
             }
 
-          meta_compositor_hide_window (window->display->compositor,
-                                       window, effect);
+          meta_compositor_hide_window (window->display->compositor, window, effect);
         }
     }
 
   did_hide = FALSE;
 
-  /* If this is the first time that we've calculating the showing
-   * state of the window, the frame and client window might not
-   * yet be mapped, so we need to map them now */
-  map_frame (window);
-  map_client_window (window);
-
   if (!window->hidden)
     {
       meta_stack_freeze (window->screen->stack);
@@ -3263,19 +3165,6 @@ meta_window_hide (MetaWindow *window)
       set_wm_state (window);
     }
 
-  toplevel_now_mapped = meta_window_toplevel_is_mapped (window);
-  if (toplevel_now_mapped != toplevel_was_mapped)
-    {
-      if (window->display->compositor)
-        {
-          /* As above, we may be *mapping* live hidden windows */
-          if (toplevel_now_mapped)
-            meta_compositor_window_mapped (window->display->compositor, window);
-          else
-            meta_compositor_window_unmapped (window->display->compositor, window);
-        }
-    }
-
   set_net_wm_state (window);
 
   if (did_hide && window->struts)
@@ -7963,7 +7852,7 @@ redraw_icon (MetaWindow *window)
   /* We could probably be smart and just redraw the icon here,
    * instead of the whole frame.
    */
-  if (window->frame && (window->mapped || window->frame->mapped))
+  if (window->frame)
     meta_ui_queue_frame_draw (window->screen->ui, window->frame->xwindow);
 }
 
diff --git a/src/meta/compositor.h b/src/meta/compositor.h
index 42ff0dd..45c8b09 100644
--- a/src/meta/compositor.h
+++ b/src/meta/compositor.h
@@ -75,11 +75,10 @@ gboolean meta_compositor_filter_keybinding (MetaCompositor *compositor,
                                             MetaScreen     *screen,
                                             MetaKeyBinding *binding);
 
-void meta_compositor_add_window    (MetaCompositor *compositor,
-                                    MetaWindow     *window);
-void meta_compositor_remove_window (MetaCompositor *compositor,
-                                    MetaWindow     *window);
-
+void meta_compositor_add_window        (MetaCompositor      *compositor,
+                                        MetaWindow          *window);
+void meta_compositor_remove_window     (MetaCompositor      *compositor,
+                                        MetaWindow          *window);
 void meta_compositor_show_window       (MetaCompositor      *compositor,
                                         MetaWindow          *window,
                                         MetaCompEffect       effect);
@@ -101,10 +100,6 @@ void meta_compositor_unmaximize_window (MetaCompositor      *compositor,
                                         MetaRectangle       *old_rect,
                                         MetaRectangle       *new_rect);
 
-void meta_compositor_window_mapped        (MetaCompositor *compositor,
-                                           MetaWindow     *window);
-void meta_compositor_window_unmapped      (MetaCompositor *compositor,
-                                           MetaWindow     *window);
 void meta_compositor_sync_window_geometry (MetaCompositor *compositor,
                                            MetaWindow     *window,
                                            gboolean        did_placement);
diff --git a/src/meta/window.h b/src/meta/window.h
index f12d405..ed444dd 100644
--- a/src/meta/window.h
+++ b/src/meta/window.h
@@ -179,8 +179,6 @@ gboolean          meta_window_requested_bypass_compositor (MetaWindow *window);
 gboolean          meta_window_requested_dont_bypass_compositor (MetaWindow *window);
 gint             *meta_window_get_all_monitors (MetaWindow *window, gsize *length);
 
-gboolean meta_window_is_mapped (MetaWindow  *window);
-gboolean meta_window_toplevel_is_mapped (MetaWindow  *window);
 gboolean meta_window_get_icon_geometry (MetaWindow    *window,
                                         MetaRectangle *rect);
 void meta_window_set_icon_geometry (MetaWindow    *window,
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