[mutter] Add API for getting work area given a logical monitor

[Jonas Ådahl <jadahl src gnome org>]

commit 79fd91ec350677553ca1a678dc72468cbf759ed8
Author: Jonas Ådahl <jadahl gmail com>
Date:   Tue Nov 29 11:48:52 2016 +0800

    Add API for getting work area given a logical monitor
    
    To complement the current API which takes an index referencing a
    logical monitor in the logical monitor array, add API that takes a
    direct reference to the logical monitor itself. The intention is to
    replace the usage of the index based API with one that doesn't rely on
    internal implementation details.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=777732

 src/core/window-private.h    |    4 ++++
 src/core/window.c            |   39 +++++++++++++++++++--------------------
 src/core/workspace-private.h |    4 ++++
 src/core/workspace.c         |   10 ++++++++++
 4 files changed, 37 insertions(+), 20 deletions(-)
---
diff --git a/src/core/window-private.h b/src/core/window-private.h
index 776ecca..51d2a5a 100644
--- a/src/core/window-private.h
+++ b/src/core/window-private.h
@@ -630,6 +630,10 @@ gboolean meta_window_handle_mouse_grab_op_event  (MetaWindow         *window,
 
 GList* meta_window_get_workspaces (MetaWindow *window);
 
+void meta_window_get_work_area_for_logical_monitor (MetaWindow         *window,
+                                                    MetaLogicalMonitor *logical_monitor,
+                                                    MetaRectangle      *area);
+
 int meta_window_get_current_tile_monitor_number (MetaWindow *window);
 void meta_window_get_current_tile_area         (MetaWindow    *window,
                                                 MetaRectangle *tile_area);
diff --git a/src/core/window.c b/src/core/window.c
index 5013609..be31191 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -6095,32 +6095,25 @@ meta_window_handle_mouse_grab_op_event  (MetaWindow         *window,
     }
 }
 
-static void
-get_work_area_monitor (MetaWindow    *window,
-                       MetaRectangle *area,
-                       int            which_monitor)
+void
+meta_window_get_work_area_for_logical_monitor (MetaWindow         *window,
+                                               MetaLogicalMonitor *logical_monitor,
+                                               MetaRectangle      *area)
 {
-  MetaBackend *backend = meta_get_backend ();
-  MetaMonitorManager *monitor_manager =
-    meta_backend_get_monitor_manager (backend);
-  MetaLogicalMonitor *logical_monitors;
   GList *tmp;
 
-  g_assert (which_monitor >= 0);
-
-  logical_monitors = meta_monitor_manager_get_logical_monitors (monitor_manager,
-                                                                NULL);
+  g_assert (logical_monitor);
 
   /* Initialize to the whole monitor */
-  *area = logical_monitors[which_monitor].rect;
+  *area = logical_monitor->rect;
 
   tmp = meta_window_get_workspaces (window);
   while (tmp != NULL)
     {
       MetaRectangle workspace_work_area;
-      meta_workspace_get_work_area_for_monitor (tmp->data,
-                                                which_monitor,
-                                                &workspace_work_area);
+      meta_workspace_get_work_area_for_logical_monitor (tmp->data,
+                                                        logical_monitor,
+                                                        &workspace_work_area);
       meta_rectangle_intersect (area,
                                 &workspace_work_area,
                                 area);
@@ -6129,7 +6122,7 @@ get_work_area_monitor (MetaWindow    *window,
 
   meta_topic (META_DEBUG_WORKAREA,
               "Window %s monitor %d has work area %d,%d %d x %d\n",
-              window->desc, which_monitor,
+              window->desc, logical_monitor->number,
               area->x, area->y, area->width, area->height);
 }
 
@@ -6163,11 +6156,17 @@ meta_window_get_work_area_for_monitor (MetaWindow    *window,
                                        int            which_monitor,
                                        MetaRectangle *area)
 {
+  MetaBackend *backend = meta_get_backend ();
+  MetaMonitorManager *monitor_manager = meta_backend_get_monitor_manager (backend);
+  MetaLogicalMonitor *logical_monitor;
+
   g_return_if_fail (which_monitor >= 0);
 
-  get_work_area_monitor (window,
-                         area,
-                         which_monitor);
+  logical_monitor =
+    meta_monitor_manager_get_logical_monitor_from_number (monitor_manager,
+                                                          which_monitor);
+
+  meta_window_get_work_area_for_logical_monitor (window, logical_monitor, area);
 }
 
 /**
diff --git a/src/core/workspace-private.h b/src/core/workspace-private.h
index e75c926..594b563 100644
--- a/src/core/workspace-private.h
+++ b/src/core/workspace-private.h
@@ -82,6 +82,10 @@ void           meta_workspace_remove_window (MetaWorkspace *workspace,
 void           meta_workspace_relocate_windows (MetaWorkspace *workspace,
                                                 MetaWorkspace *new_home);
 
+void meta_workspace_get_work_area_for_logical_monitor (MetaWorkspace      *workspace,
+                                                       MetaLogicalMonitor *logical_monitor,
+                                                       MetaRectangle      *area);
+
 void meta_workspace_invalidate_work_area (MetaWorkspace *workspace);
 
 GList* meta_workspace_get_onscreen_region       (MetaWorkspace *workspace);
diff --git a/src/core/workspace.c b/src/core/workspace.c
index 5ea817b..1633c80 100644
--- a/src/core/workspace.c
+++ b/src/core/workspace.c
@@ -1006,6 +1006,16 @@ meta_workspace_set_builtin_struts (MetaWorkspace *workspace,
   meta_workspace_invalidate_work_area (workspace);
 }
 
+void
+meta_workspace_get_work_area_for_logical_monitor (MetaWorkspace      *workspace,
+                                                  MetaLogicalMonitor *logical_monitor,
+                                                  MetaRectangle      *area)
+{
+  meta_workspace_get_work_area_for_monitor (workspace,
+                                            logical_monitor->number,
+                                            area);
+}
+
 /**
  * meta_workspace_get_work_area_for_monitor:
  * @workspace: a #MetaWorkspace