I'm investigating how to make the IPC transfer a bit more secure on the

include/core/SkFlattenable.h

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkFlattenable_DEFINED
 #define SkFlattenable_DEFINED
 
 #include "SkRefCnt.h"
 
 class SkFlattenableReadBuffer;
 class SkFlattenableWriteBuffer;
 
 #define SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(flattenable) \
         SkFlattenable::Registrar(#flattenable, flattenable::CreateProc);
 
 #define SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP() static void InitializeFlattenables();
 
 #define SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(flattenable) \
     void flattenable::InitializeFlattenables() {
 
 #define SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END \
     }
 
 #define SK_DECLARE_UNFLATTENABLE_OBJECT() \
-    virtual Factory getFactory() SK_OVERRIDE { return NULL; }; \
+    virtual Factory getFactory() SK_OVERRIDE { return NULL; }
 
 #define SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(flattenable) \
     virtual Factory getFactory() SK_OVERRIDE { return CreateProc; } \
     static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { \
         return SkNEW_ARGS(flattenable, (buffer)); \
     }
 
 /** \class SkFlattenable
 
  SkFlattenable is the base class for objects that need to be flattened
  into a data stream for either transport or as part of the key to the
  font cache.
  */
 class SK_API SkFlattenable : public SkRefCnt {
 public:
     SK_DECLARE_INST_COUNT(SkFlattenable)
 
+    enum Type { FLATTENABLE, IMAGE_FILTER };

[sugoi, 2013/08/13 15:20:26]

This, of course, could be extended to other types.

+
     typedef SkFlattenable* (*Factory)(SkFlattenableReadBuffer&);
 
     SkFlattenable() {}
 
     /** Implement this to return a factory function pointer that can be called
      to recreate your class given a buffer (previously written to by your
      override of flatten().
      */
     virtual Factory getFactory() = 0;
+    virtual bool isA(Type type) const { return FLATTENABLE == type; }
 
     static Factory NameToFactory(const char name[]);
     static const char* FactoryToName(Factory);
     static void Register(const char name[], Factory);
 
     class Registrar {
     public:
         Registrar(const char name[], Factory factory) {
             SkFlattenable::Register(name, factory);
         }
@@ skipping 10 matching lines @@
 private:
     static void InitializeFlattenables();
 
     friend class SkGraphics;
     friend class SkFlattenableWriteBuffer;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif