Modifiers: Add link and copy functions

Adds functions to copy a modifier between objects, and an ED_ level
function for linking modifiers between objects. This will be used in
outliner modifier drag and drop.

These functions support both regular and grease pencil modifiers.

Differential Revision: https://developer.blender.org/D8642

3 files changed, 27 insertions, 0 deletions

diff --git a/source/blender/editors/include/ED_object.h b/source/blender/editors/include/ED_object.h
index fcf18f306e1..45e23cadaaa 100644
--- a/source/blender/editors/include/ED_object.h
+++ b/source/blender/editors/include/ED_object.h
@@ -429,6 +429,10 @@ int ED_object_modifier_copy(struct ReportList *reports,
                             struct Scene *scene,
                             struct Object *ob,
                             struct ModifierData *md);
+void ED_object_modifier_link(struct bContext *C, struct Object *ob_dst, struct Object *ob_src);
+void ED_object_modifier_copy_to_object(struct Object *ob_dst,
+                                       struct Object *ob_src,
+                                       struct ModifierData *md);
 
 bool ED_object_iter_other(struct Main *bmain,
                           struct Object *orig_ob,
@@ -469,6 +473,8 @@ int ED_object_gpencil_modifier_apply(struct Main *bmain,
 int ED_object_gpencil_modifier_copy(struct ReportList *reports,
                                     struct Object *ob,
                                     struct GpencilModifierData *md);
+void ED_object_gpencil_modifier_copy_to_object(struct Object *ob_dst,
+                                               struct GpencilModifierData *md);
 
 /* object_shader_fx.c */
 struct ShaderFxData *ED_object_shaderfx_add(struct ReportList *reports,
diff --git a/source/blender/editors/object/object_gpencil_modifier.c b/source/blender/editors/object/object_gpencil_modifier.c
index e9b430ee54b..eed3c7f419d 100644
--- a/source/blender/editors/object/object_gpencil_modifier.c
+++ b/source/blender/editors/object/object_gpencil_modifier.c
@@ -322,6 +322,13 @@ int ED_object_gpencil_modifier_copy(ReportList *reports, Object *ob, GpencilModi
   return 1;
 }
 
+void ED_object_gpencil_modifier_copy_to_object(Object *ob_dst, GpencilModifierData *md)
+{
+  BKE_object_copy_gpencil_modifier(ob_dst, md);
+  WM_main_add_notifier(NC_OBJECT | ND_MODIFIER, ob_dst);
+  DEG_id_tag_update(&ob_dst->id, ID_RECALC_TRANSFORM | ID_RECALC_GEOMETRY | ID_RECALC_ANIMATION);
+}
+
 /************************ add modifier operator *********************/
 
 static int gpencil_modifier_add_exec(bContext *C, wmOperator *op)
diff --git a/source/blender/editors/object/object_modifier.c b/source/blender/editors/object/object_modifier.c
index 99644c8f233..370667391c5 100644
--- a/source/blender/editors/object/object_modifier.c
+++ b/source/blender/editors/object/object_modifier.c
@@ -516,6 +516,20 @@ bool ED_object_modifier_move_to_index(ReportList *reports,
   return true;
 }
 
+void ED_object_modifier_link(bContext *C, Object *ob_dst, Object *ob_src)
+{
+  BKE_object_link_modifiers(ob_dst, ob_src);
+  WM_event_add_notifier(C, NC_OBJECT | ND_MODIFIER, ob_dst);
+  DEG_id_tag_update(&ob_dst->id, ID_RECALC_TRANSFORM | ID_RECALC_GEOMETRY | ID_RECALC_ANIMATION);
+}
+
+void ED_object_modifier_copy_to_object(Object *ob_dst, Object *ob_src, ModifierData *md)
+{
+  BKE_object_copy_modifier(ob_dst, ob_src, md);
+  WM_main_add_notifier(NC_OBJECT | ND_MODIFIER, ob_dst);
+  DEG_id_tag_update(&ob_dst->id, ID_RECALC_TRANSFORM | ID_RECALC_GEOMETRY | ID_RECALC_ANIMATION);
+}
+
 bool ED_object_modifier_convert(ReportList *UNUSED(reports),
                                 Main *bmain,
                                 Depsgraph *depsgraph,