3 files changed, 75 insertions, 7 deletions

diff --git a/source/blender/editors/screen/area.c b/source/blender/editors/screen/area.c
index 833c9accf95..d5456482d67 100644
--- a/source/blender/editors/screen/area.c
+++ b/source/blender/editors/screen/area.c
@@ -2001,6 +2001,68 @@ void ED_area_init(wmWindowManager *wm, wmWindow *win, ScrArea *area)
   }
 }
 
+static void area_offscreen_init(wmWindowManager *wm, ScrArea *area)
+{
+  area->type = BKE_spacetype_from_id(area->spacetype);
+
+  if (area->type == NULL) {
+    area->spacetype = SPACE_VIEW3D;
+    area->type = BKE_spacetype_from_id(area->spacetype);
+  }
+
+  LISTBASE_FOREACH (ARegion *, region, &area->regionbase) {
+    region->type = BKE_regiontype_from_id_or_first(area->type, region->regiontype);
+  }
+}
+
+ScrArea *ED_area_offscreen_create(wmWindowManager *wm, wmWindow *win, eSpace_Type space_type)
+{
+  ScrArea *area = MEM_callocN(sizeof(*area), __func__);
+  area->spacetype = space_type;
+
+  screen_area_spacelink_add(WM_window_get_active_scene(win), area, space_type);
+  area_offscreen_init(wm, area);
+
+  return area;
+}
+
+static void area_offscreen_exit(wmWindowManager *wm, wmWindow *win, ScrArea *area)
+{
+  if (area->type && area->type->exit) {
+    area->type->exit(wm, area);
+  }
+
+  LISTBASE_FOREACH (ARegion *, region, &area->regionbase) {
+    if (region->type && region->type->exit) {
+      region->type->exit(wm, region);
+    }
+
+    WM_event_modal_handler_region_replace(win, region, NULL);
+    WM_draw_region_free(region, true);
+
+    MEM_SAFE_FREE(region->headerstr);
+
+    if (region->regiontimer) {
+      WM_event_remove_timer(wm, win, region->regiontimer);
+      region->regiontimer = NULL;
+    }
+
+    if (wm->message_bus) {
+      WM_msgbus_clear_by_owner(wm->message_bus, region);
+    }
+  }
+
+  WM_event_modal_handler_area_replace(win, area, NULL);
+}
+
+void ED_area_offscreen_free(wmWindowManager *wm, wmWindow *win, ScrArea *area)
+{
+  area_offscreen_exit(wm, win, area);
+
+  BKE_screen_area_free(area);
+  MEM_freeN(area);
+}
+
 static void region_update_rect(ARegion *region)
 {
   region->winx = BLI_rcti_size_x(&region->winrct) + 1;
diff --git a/source/blender/editors/screen/screen_edit.c b/source/blender/editors/screen/screen_edit.c
index 1c068fdd6e4..02b1e002d86 100644
--- a/source/blender/editors/screen/screen_edit.c
+++ b/source/blender/editors/screen/screen_edit.c
@@ -574,6 +574,17 @@ bool screen_area_close(struct bContext *C, bScreen *screen, ScrArea *area)
   return screen_area_join_ex(C, screen, sa2, area, true);
 }
 
+void screen_area_spacelink_add(Scene *scene, ScrArea *area, eSpace_Type space_type)
+{
+  SpaceType *stype = BKE_spacetype_from_id(space_type);
+  SpaceLink *slink = stype->create(area, scene);
+
+  area->regionbase = slink->regionbase;
+
+  BLI_addhead(&area->spacedata, slink);
+  BLI_listbase_clear(&slink->regionbase);
+}
+
 /* ****************** EXPORTED API TO OTHER MODULES *************************** */
 
 /* screen sets cursor based on active region */
@@ -1023,13 +1034,7 @@ static void screen_global_area_refresh(wmWindow *win,
   }
   else {
     area = screen_area_create_with_geometry(&win->global_areas, rect, space_type);
-    SpaceType *stype = BKE_spacetype_from_id(space_type);
-    SpaceLink *slink = stype->create(area, WM_window_get_active_scene(win));
-
-    area->regionbase = slink->regionbase;
-
-    BLI_addhead(&area->spacedata, slink);
-    BLI_listbase_clear(&slink->regionbase);
+    screen_area_spacelink_add(WM_window_get_active_scene(win), area, space_type);
 
     /* Data specific to global areas. */
     area->global = MEM_callocN(sizeof(*area->global), __func__);
diff --git a/source/blender/editors/screen/screen_intern.h b/source/blender/editors/screen/screen_intern.h
index 04ee62b1631..47229e5e2b5 100644
--- a/source/blender/editors/screen/screen_intern.h
+++ b/source/blender/editors/screen/screen_intern.h
@@ -94,6 +94,7 @@ eScreenDir area_getorientation(ScrArea *sa_a, ScrArea *sa_b);
 void area_getoffsets(
     ScrArea *sa_a, ScrArea *sa_b, const eScreenDir dir, int *r_offset1, int *r_offset2);
 bool screen_area_close(struct bContext *C, bScreen *screen, ScrArea *area);
+void screen_area_spacelink_add(struct Scene *scene, ScrArea *area, eSpace_Type space_type);
 struct AZone *ED_area_actionzone_find_xy(ScrArea *area, const int xy[2]);
 
 /* screen_geometry.c */