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
  16 ScopedPPResource::ScopedPPResource(PP_Resource resource) : id_(resource) {
  17   CallAddRef();
  18 }
  19
  20 ScopedPPResource::ScopedPPResource(const PassRef&, PP_Resource resource)
  21     : id_(resource) {
  22 }
  23
  24 ScopedPPResource::ScopedPPResource(Resource* resource)
  25     : id_(resource ? resource->GetReference() : 0) {
  26   // GetReference AddRef's for us.
  27 }
  28
  29 ScopedPPResource::ScopedPPResource(const ScopedPPResource& other)
  30     : id_(other.id_) {
  31   CallAddRef();
  32 }
  33
  34 ScopedPPResource::~ScopedPPResource() {
  35   CallRelease();
  36 }
  37
  38 ScopedPPResource& ScopedPPResource::operator=(PP_Resource resource) {
  39   if (id_ == resource)
  40     return *this;  // Be careful about self-assignment.
  41   CallRelease();
  42   id_ = resource;
  43   CallAddRef();
  44   return *this;
  45 }
  46
  47 ScopedPPResource& ScopedPPResource::operator=(
  48     const ScopedPPResource& resource) {
  49   if (id_ == resource.id_)
  50     return *this;  // Be careful about self-assignment.
  51   CallRelease();
  52   id_ = resource.id_;
  53   CallAddRef();
  54   return *this;
  55 }
  56
  57 PP_Resource ScopedPPResource::Release() {
  58   // We do NOT call CallRelease, because we want to pass our reference to the
  59   // caller.
  60
  61   PP_Resource ret = id_;
  62   id_ = 0;
  63   return ret;
  64 }
  65
  66 void ScopedPPResource::CallAddRef() {
  67   if (id_)
  68     PpapiGlobals::Get()->GetResourceTracker()->AddRefResource(id_);
  69 }
  70
  71 void ScopedPPResource::CallRelease() {
  72   if (id_)
  73     PpapiGlobals::Get()->GetResourceTracker()->ReleaseResource(id_);
  74 }
  75
  76 }  // namespace ppapi