Transfer Data: add main core code and operators.

This add code needed to map a CD data layout from source mesh towards destination one,
and code needed to actually transfer data, using BKE's mesh remap generated data.

This allows to transfer most CD layers (vgroups, vcols, uvs...) as well as fake, boolean ones
(like smooth/sharp edges/faces, etc.). Some types are not yet transferable, mainly
shape keys, this is known TODO.

Data transfer can also use some advanced mixing in some cases (mostly, vgroups and vcols).

Notes:
* New transfer operators transfer data from active object towards selected ones.
* Modifier will be committed separately.
* Old weight transfer code (for vgroups) is kept for now, mostly because it is the only
  usable one in weightpaint mode (it transfers from selected object to active one,
  this is not sensible in Object mode, but needed in WeightPaint one). This will be addressed soon.

Again, heavily reviewed and enhanced by Campbell, thanks!

1 files changed, 7 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_object_deform.h b/source/blender/blenkernel/BKE_object_deform.h
index 0e5ad2d51c8..e956815d6f7 100644
--- a/source/blender/blenkernel/BKE_object_deform.h
+++ b/source/blender/blenkernel/BKE_object_deform.h
@@ -72,4 +72,11 @@ bool *BKE_object_defgroup_selected_get(struct Object *ob, int defbase_tot, int *
 }
 #endif
 
+/* Select helpers */
+bool *BKE_objdef_vgroup_subset_from_select_type(
+        struct Object *ob, enum eVGroupSelect subset_type, int *r_vgroup_tot, int *r_subset_count);
+void BKE_objdef_vgroup_subset_to_index_array(
+        const bool *vgroup_validmap, const int vgroup_tot, int *r_vgroup_subset_map);
+
+
 #endif  /* __BKE_OBJECT_DEFORM_H__ */