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      1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_RENDERER_PEPPER_V8_VAR_CONVERTER_H
      6 #define CONTENT_RENDERER_PEPPER_V8_VAR_CONVERTER_H
      7 
      8 #include "base/basictypes.h"
      9 #include "base/callback.h"
     10 #include "base/compiler_specific.h"
     11 #include "base/message_loop/message_loop_proxy.h"
     12 #include "ppapi/c/pp_instance.h"
     13 #include "ppapi/c/pp_var.h"
     14 #include "ppapi/shared_impl/scoped_pp_var.h"
     15 #include "v8/include/v8.h"
     16 #include "content/common/content_export.h"
     17 
     18 namespace content {
     19 
     20 class ResourceConverter;
     21 
     22 class CONTENT_EXPORT V8VarConverter {
     23  public:
     24   explicit V8VarConverter(PP_Instance instance);
     25   // Constructor for testing.
     26   V8VarConverter(PP_Instance instance,
     27                  scoped_ptr<ResourceConverter> resource_converter);
     28   ~V8VarConverter();
     29 
     30   // Converts the given PP_Var to a v8::Value. True is returned upon success.
     31   bool ToV8Value(const PP_Var& var,
     32                  v8::Handle<v8::Context> context,
     33                  v8::Handle<v8::Value>* result);
     34 
     35   struct VarResult {
     36    public:
     37     VarResult() : completed_synchronously(false), success(false) {}
     38 
     39     // True if the conversion completed synchronously and the callback will not
     40     // be called.
     41     bool completed_synchronously;
     42 
     43     // True if the conversion was successful. Only valid if
     44     // |completed_synchronously| is true.
     45     bool success;
     46 
     47     // The result if the conversion was successful. Only valid if
     48     // |completed_synchronously| and |success| are true.
     49     ppapi::ScopedPPVar var;
     50   };
     51 
     52   // Converts the given v8::Value to a PP_Var. Every PP_Var in the reference
     53   // graph in the result will have a refcount equal to the number of references
     54   // to it in the graph. The root of the result will have one additional
     55   // reference. The callback is run when conversion is complete with the
     56   // resulting var and a bool indicating success or failure. Conversion may be
     57   // asynchronous because converting some resources may result in communication
     58   // across IPC. |context| is guaranteed to only be used synchronously. If
     59   // the conversion can occur synchronously, |callback| will not be run,
     60   // otherwise it will be run.
     61   VarResult FromV8Value(
     62       v8::Handle<v8::Value> val,
     63       v8::Handle<v8::Context> context,
     64       const base::Callback<void(const ppapi::ScopedPPVar&, bool)>& callback);
     65   bool FromV8ValueSync(v8::Handle<v8::Value> val,
     66                        v8::Handle<v8::Context> context,
     67                        ppapi::ScopedPPVar* result_var);
     68  private:
     69   // Returns true on success, false on failure.
     70   bool FromV8ValueInternal(v8::Handle<v8::Value> val,
     71                            v8::Handle<v8::Context> context,
     72                            ppapi::ScopedPPVar* result_var);
     73 
     74   // The message loop to run the callback to |FromV8Value| from.
     75   scoped_refptr<base::MessageLoopProxy> message_loop_proxy_;
     76 
     77   // The converter to use for converting V8 vars to resources.
     78   scoped_ptr<ResourceConverter> resource_converter_;
     79 
     80   DISALLOW_COPY_AND_ASSIGN(V8VarConverter);
     81 };
     82 
     83 }  // namespace content
     84 
     85 #endif  // CONTENT_RENDERER_PEPPER_V8_VAR_CONVERTER_H
     86