Cleanup: Simplify BKE_mesh_nomain_to_mesh

- Remove "take ownership" argument which was confusing and always true
  - The argument made ownership very confusing
  - Better to avoid boolean arguments that switch a function's purpose
- Remove "mask" argument which was basically wrong and not used properly
  - "EVERYTHING" was used because developers are wary of removing data
  - Instead use `CD_MASK_MESH` for its purpose of original mesh data
- Remove use of shallow copied temporary mesh, which is unnecessary now
- Split shape key processing into separate functions and use C++ types
- Copy fields explicitly rather than using memcpy for the whole struct
- Use higher level functions and avoid redundant code
  - The whole idea is pretty simple and can be built from standard logic
- Adjust `CustomData` logic to be consistent with "assign" expectations
  - Clear the layer data from the source, and moves the anonymous ID

Differential Revision: https://developer.blender.org/D15857

1 files changed, 3 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_key.h b/source/blender/blenkernel/BKE_key.h
index 9f506ded8e9..45a72e8d7a3 100644
--- a/source/blender/blenkernel/BKE_key.h
+++ b/source/blender/blenkernel/BKE_key.h
@@ -95,6 +95,9 @@ struct KeyBlock *BKE_keyblock_from_key(struct Key *key, int index);
  * Get the appropriate #KeyBlock given a name to search for.
  */
 struct KeyBlock *BKE_keyblock_find_name(struct Key *key, const char name[]);
+
+struct KeyBlock *BKE_keyblock_find_uid(struct Key *key, int uid);
+
 /**
  * \brief copy shape-key attributes, but not key data or name/UID.
  */