documentation - brief descriptions for bpy api files.

source/blender/python/intern/bpy_rna.c

@@ -22,9 +22,14 @@
 
 /** \file blender/python/intern/bpy_rna.c
  *  \ingroup pythonintern
+ *
+ * This file is the main interface between python and blenders data api (RNA),
+ * exposing RNA to python so blender data can be accessed in a python like way.
+ *
+ * The two main types are 'BPy_StructRNA' and 'BPy_PropertyRNA' - the base
+ * classes for most of the data python accesses in blender.
  */
 
-
 #include <Python.h>
 
 #include <stddef.h>
@@ -6470,7 +6475,9 @@ static int bpy_class_call(bContext *C, PointerRNA *ptr, FunctionRNA *func, Param
 	const int is_operator= RNA_struct_is_a(ptr->type, &RNA_Operator);
 	const char *func_id= RNA_function_identifier(func);
 	/* testing, for correctness, not operator and not draw function */
-	const short is_readonly= strstr("draw", func_id) || /*strstr("render", func_id) ||*/ !is_operator;
+	const short is_readonly= ((strncmp("draw", func_id, 4) ==0) || /* draw or draw_header */
+							 /*strstr("render", func_id) ||*/
+							 !is_operator);
 #endif
 
 	py_class= RNA_struct_py_type_get(ptr->type);