Depsgraph: support flushing parameters without a full COW update

Avoid computationally expensive copying operations
when only some settings have been modified.

This is done by adding support for updating parameters
without tagging for copy-on-write.

Currently only mesh data blocks are supported,
other data-blocks can be added individually.

This prepares for changing values such as edit-mesh auto-smooth angle
in edit-mode without duplicating all mesh-data.
The benefit will only be seen when the user interface no longer tags
all ID's for copy on write updates.

ID_RECALC_GEOMETRY_ALL_MODES has been added to support situations
where non edit-mode geometry is modified in edit-mode.
While this isn't something user are likely to do,
Python scripts may change the underlying mesh.

Reviewed By: sergey

Ref D11377

1 files changed, 3 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_lib_id.h b/source/blender/blenkernel/BKE_lib_id.h
index e16507bf3cc..fac5dc8c010 100644
--- a/source/blender/blenkernel/BKE_lib_id.h
+++ b/source/blender/blenkernel/BKE_lib_id.h
@@ -315,6 +315,9 @@ void BKE_id_blend_write(struct BlendWriter *writer, struct ID *id);
 
 #define IS_TAGGED(_id) ((_id) && (((ID *)_id)->tag & LIB_TAG_DOIT))
 
+/* lib_id_eval.c */
+void BKE_id_eval_properties_copy(struct ID *id_cow, struct ID *id);
+
 #ifdef __cplusplus
 }
 #endif