ppapi/proxy/host_var_serialization_rules.cc

   1 // Copyright (c) 2012 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 #include "ppapi/proxy/host_var_serialization_rules.h"
   6
   7 #include "ppapi/shared_impl/ppapi_globals.h"
   8 #include "ppapi/shared_impl/var_tracker.h"
   9
  10 using ppapi::PpapiGlobals;
  11 using ppapi::VarTracker;
  12
  13 namespace ppapi {
  14 namespace proxy {
  15
  16 HostVarSerializationRules::HostVarSerializationRules() {
  17 }
  18
  19 HostVarSerializationRules::~HostVarSerializationRules() {
  20 }
  21
  22 PP_Var HostVarSerializationRules::SendCallerOwned(const PP_Var& var) {
  23   return var;
  24 }
  25
  26 PP_Var HostVarSerializationRules::BeginReceiveCallerOwned(const PP_Var& var) {
  27   return var;
  28 }
  29
  30 void HostVarSerializationRules::EndReceiveCallerOwned(const PP_Var& var) {
  31   if (var.type != PP_VARTYPE_OBJECT && var.type >= PP_VARTYPE_STRING) {
  32     // Release our reference to the local Var.
  33     PpapiGlobals::Get()->GetVarTracker()->ReleaseVar(var);
  34   }
  35 }
  36
  37 PP_Var HostVarSerializationRules::ReceivePassRef(const PP_Var& var) {
  38   // See PluginVarSerialization::BeginSendPassRef for an example.
  39   if (var.type == PP_VARTYPE_OBJECT)
  40     PpapiGlobals::Get()->GetVarTracker()->AddRefVar(var);
  41   return var;
  42 }
  43
  44 PP_Var HostVarSerializationRules::BeginSendPassRef(const PP_Var& var) {
  45   return var;
  46 }
  47
  48 void HostVarSerializationRules::EndSendPassRef(const PP_Var& var) {
  49   // See PluginVarSerializationRules::ReceivePassRef for an example. We don't
  50   // need to do anything here for "Object" vars; we continue holding one ref on
  51   // behalf of the plugin.
  52   if (var.type != PP_VARTYPE_OBJECT) {
  53     // But for other ref-counted types (like String, Array, and Dictionary),
  54     // the value will be re-constituted on the other side as a new Var with no
  55     // connection to the host-side reference counting. We must therefore release
  56     // our reference count; this is roughly equivalent to passing the ref to the
  57     // plugin.
  58     PpapiGlobals::Get()->GetVarTracker()->ReleaseVar(var);
  59   }
  60 }
  61
  62 void HostVarSerializationRules::ReleaseObjectRef(const PP_Var& var) {
  63   PpapiGlobals::Get()->GetVarTracker()->ReleaseVar(var);
  64 }
  65
  66 }  // namespace proxy
  67 }  // namespace ppapi