minor speedup to python/rna api keyword argument lookups.

- dont use hash lookups in this case because converting the string to unicode and doing a hash lookup is slower then looping over the keys and comparing (which avoids creating and throwning away a unicode string).

source/blender/python/intern/bpy_rna.c

@@ -4297,6 +4297,27 @@ static PyObject *pyrna_param_to_py(PointerRNA *ptr, PropertyRNA *prop, void *dat
 	return ret;
 }
 
+/* Use to replace PyDict_GetItemString() when the overhead of converting a
+ * string into a python unicode is higher than a non hash lookup.
+ * works on small dict's such as keyword args. */
+static PyObject *small_dict_get_item_string(PyObject *dict, const char *key_lookup)
+{
+	PyObject *key= NULL;
+	Py_ssize_t pos = 0;
+	PyObject *value = NULL;
+
+	/* case not, search for it in the script's global dictionary */
+	while (PyDict_Next(dict, &pos, &key, &value)) {
+		if(PyUnicode_Check(key)) {
+			if(strcmp(key_lookup, _PyUnicode_AsString(key))==0) {
+				return value;
+			}
+		}
+	}
+
+	return NULL;
+}
+
 static PyObject *pyrna_func_call(BPy_FunctionRNA *self, PyObject *args, PyObject *kw)
 {
 	/* Note, both BPy_StructRNA and BPy_PropertyRNA can be used here */
@@ -4391,7 +4412,11 @@ static PyObject *pyrna_func_call(BPy_FunctionRNA *self, PyObject *args, PyObject
 			kw_arg= FALSE;
 		}
 		else if (kw != NULL) {
+#if 0
 			item= PyDict_GetItemString(kw, RNA_property_identifier(parm)); /* borrow ref */
+#else
+			item= small_dict_get_item_string(kw, RNA_property_identifier(parm)); /* borrow ref */
+#endif
 			if(item)
 				kw_tot++; /* make sure invalid keywords are not given */