[Bf-blender-cvs] [6b0d4302beb] blender2.8: PyAPI: use instancing when supported

[Campbell Barton]

Commit: 6b0d4302beb5e79a6569b4afe17d05150cdf42d0
Author: Campbell Barton
Date:   Fri Jul 21 00:45:35 2017 +1000
Branches: blender2.8
https://developer.blender.org/rB6b0d4302beb5e79a6569b4afe17d05150cdf42d0

PyAPI: use instancing when supported

This means when a new data-type is returned it will use the same
instance as the previously created one (if it exists).

===================================================================

M	source/blender/python/intern/bpy_rna.c

===================================================================

diff --git a/source/blender/python/intern/bpy_rna.c b/source/blender/python/intern/bpy_rna.c
index 51e179fb317..ca1e74ce28e 100644
--- a/source/blender/python/intern/bpy_rna.c
+++ b/source/blender/python/intern/bpy_rna.c
@@ -6658,6 +6658,17 @@ PyObject *pyrna_struct_CreatePyObject(PointerRNA *ptr)
 		Py_RETURN_NONE;
 	}
 	else {
+		/* New in 2.8x, since not many types support instancing
+		 * we may want to use a flag to avoid looping over all classes. - campbell */
+		{
+			void **instance = RNA_struct_instance(ptr);
+			if (instance && *instance) {
+				pyrna = *instance;
+				Py_INCREF(pyrna);
+				return (PyObject *)pyrna;
+			}
+		}
+
 		PyTypeObject *tp = (PyTypeObject *)pyrna_struct_Subtype(ptr);
 
 		if (tp) {