[metacity/wip/muktupavels/work-areas-v3: 3/4] window: add support for _NET_WM_STRUT_AREA

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 4016c5ca832528f95353f4cf19a36be460ee82b4
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sat Jun 16 22:19:11 2018 +0300

    window: add support for _NET_WM_STRUT_AREA

 src/core/atomnames.h    |  1 +
 src/core/window-props.c |  6 ++++
 src/core/window.c       | 85 +++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 92 insertions(+)
---
diff --git a/src/core/atomnames.h b/src/core/atomnames.h
index 5ad031b6..8c75fab8 100644
--- a/src/core/atomnames.h
+++ b/src/core/atomnames.h
@@ -152,6 +152,7 @@ item(_NET_WM_STATE_ABOVE)
 item(_NET_WM_STATE_BELOW)
 item(_NET_STARTUP_ID)
 item(_NET_WM_STRUT_PARTIAL)
+item(_NET_WM_STRUT_AREA)
 item(_NET_WM_ACTION_FULLSCREEN)
 item(_NET_WM_ACTION_MINIMIZE)
 item(_NET_FRAME_EXTENTS)
diff --git a/src/core/window-props.c b/src/core/window-props.c
index 32f47614..04a09dd1 100644
--- a/src/core/window-props.c
+++ b/src/core/window-props.c
@@ -1954,6 +1954,12 @@ meta_display_init_window_prop_hooks (MetaDisplay *display)
       reload_struts,
       NONE
     },
+    {
+      display->atom__NET_WM_STRUT_AREA,
+      META_PROP_VALUE_INVALID,
+      reload_struts,
+      NONE
+    },
     {
       display->atom__NET_WM_WINDOW_OPACITY,
       META_PROP_VALUE_CARDINAL,
diff --git a/src/core/window.c b/src/core/window.c
index 789048ec..ad5516ce 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -6375,6 +6375,91 @@ meta_window_update_struts (MetaWindow *window)
   new_struts = NULL;
 
   if (meta_prop_get_cardinal_list (window->display,
+                                   window->xwindow,
+                                   window->display->atom__NET_WM_STRUT_AREA,
+                                   &struts, &nitems))
+    {
+      if (nitems != 4)
+        {
+          meta_verbose ("_NET_WM_STRUT_AREA on %s has %d values instead of 4\n",
+                        window->desc, nitems);
+        }
+      else
+        {
+          MetaEdge *temp;
+          MetaSide side;
+          gboolean valid;
+          int i;
+
+          temp = g_new (MetaEdge, 1);
+
+          temp->rect.x = struts[0];
+          temp->rect.y = struts[1];
+          temp->rect.width = struts[2];
+          temp->rect.height = struts[3];
+
+          side = META_SIDE_LEFT;
+          valid = FALSE;
+
+          for (i = 0; i < window->screen->n_monitor_infos; i++)
+            {
+              MetaRectangle monitor;
+
+              monitor = window->screen->monitor_infos[i].rect;
+              if (!meta_rectangle_contains_rect (&monitor, &temp->rect))
+                continue;
+
+              if (temp->rect.height > temp->rect.width)
+                {
+                  if (temp->rect.x == monitor.x)
+                    {
+                      side = META_SIDE_LEFT;
+                      valid = TRUE;
+                    }
+                  else if (temp->rect.x + temp->rect.width == monitor.x + monitor.width)
+                    {
+                      side = META_SIDE_RIGHT;
+                      valid = TRUE;
+                    }
+                }
+              else
+                {
+                  if (temp->rect.y == monitor.y)
+                    {
+                      side = META_SIDE_TOP;
+                      valid = TRUE;
+                    }
+                  else if (temp->rect.y + temp->rect.height == monitor.y + monitor.height)
+                    {
+                      side = META_SIDE_BOTTOM;
+                      valid = TRUE;
+                    }
+                }
+            }
+
+          if (valid)
+            {
+              temp->side_type = side;
+              temp->edge_type = META_EDGE_MONITOR;
+
+              new_struts = g_slist_prepend (new_struts, temp);
+            }
+          else
+            {
+              g_free (temp);
+            }
+        }
+
+      meta_XFree (struts);
+    }
+  else
+    {
+      meta_verbose ("No _NET_WM_STRUT_AREA property for %s\n",
+                    window->desc);
+    }
+
+  if (!new_struts &&
+      meta_prop_get_cardinal_list (window->display,
                                    window->xwindow,
                                    window->display->atom__NET_WM_STRUT_PARTIAL,
                                    &struts, &nitems))