ppapi/shared_impl/scoped_pp_resource.cc

   1 // Copyright (c) 2011 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/shared_impl/scoped_pp_resource.h"
   6
   7 #include "ppapi/shared_impl/ppapi_globals.h"
   8 #include "ppapi/shared_impl/resource.h"
   9 #include "ppapi/shared_impl/resource_tracker.h"
  10
  11 namespace ppapi {
  12
  13 ScopedPPResource::ScopedPPResource() : id_(0) {}
  14
  15 ScopedPPResource::ScopedPPResource(PP_Resource resource) : id_(resource) {
  16   CallAddRef();
  17 }
  18
  19 ScopedPPResource::ScopedPPResource(const PassRef&, PP_Resource resource)
  20     : id_(resource) {}
  21
  22 ScopedPPResource::ScopedPPResource(Resource* resource)
  23     : id_(resource ? resource->GetReference() : 0) {
  24   // GetReference AddRef's for us.
  25 }
  26
  27 ScopedPPResource::ScopedPPResource(const ScopedPPResource& other)
  28     : id_(other.id_) {
  29   CallAddRef();
  30 }
  31
  32 ScopedPPResource::~ScopedPPResource() { CallRelease(); }
  33
  34 ScopedPPResource& ScopedPPResource::operator=(PP_Resource resource) {
  35   if (id_ == resource)
  36     return *this;  // Be careful about self-assignment.
  37   CallRelease();
  38   id_ = resource;
  39   CallAddRef();
  40   return *this;
  41 }
  42
  43 ScopedPPResource& ScopedPPResource::operator=(
  44     const ScopedPPResource& resource) {
  45   if (id_ == resource.id_)
  46     return *this;  // Be careful about self-assignment.
  47   CallRelease();
  48   id_ = resource.id_;
  49   CallAddRef();
  50   return *this;
  51 }
  52
  53 PP_Resource ScopedPPResource::Release() {
  54   // We do NOT call CallRelease, because we want to pass our reference to the
  55   // caller.
  56
  57   PP_Resource ret = id_;
  58   id_ = 0;
  59   return ret;
  60 }
  61
  62 void ScopedPPResource::CallAddRef() {
  63   if (id_)
  64     PpapiGlobals::Get()->GetResourceTracker()->AddRefResource(id_);
  65 }
  66
  67 void ScopedPPResource::CallRelease() {
  68   if (id_)
  69     PpapiGlobals::Get()->GetResourceTracker()->ReleaseResource(id_);
  70 }
  71
  72 }  // namespace ppapi