1 files changed, 119 insertions, 0 deletions
diff --git a/gfx/layers/client/CompositableChild.cpp b/gfx/layers/client/CompositableChild.cpp
new file mode 100644
index 000000000..34a0e0696
--- /dev/null
+++ b/gfx/layers/client/CompositableChild.cpp
@@ -0,0 +1,119 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "CompositableChild.h"
+#include "CompositableClient.h"
+
+namespace mozilla {
+namespace layers {
+
+/* static */ PCompositableChild*
+CompositableChild::CreateActor()
+{
+  CompositableChild* child = new CompositableChild();
+  child->AddRef();
+  return child;
+}
+
+/* static */ void
+CompositableChild::DestroyActor(PCompositableChild* aChild)
+{
+  static_cast<CompositableChild*>(aChild)->Release();
+}
+
+CompositableChild::CompositableChild()
+ : mCompositableClient(nullptr),
+   mAsyncID(0),
+   mCanSend(true)
+{
+  MOZ_COUNT_CTOR(CompositableChild);
+}
+
+CompositableChild::~CompositableChild()
+{
+  MOZ_COUNT_DTOR(CompositableChild);
+}
+
+bool
+CompositableChild::IsConnected() const
+{
+  return mCompositableClient && mCanSend;
+}
+
+void
+CompositableChild::Init(CompositableClient* aCompositable, uint64_t aAsyncID)
+{
+  mCompositableClient = aCompositable;
+  mAsyncID = aAsyncID;
+}
+
+void
+CompositableChild::RevokeCompositableClient()
+{
+  mCompositableClient = nullptr;
+}
+
+RefPtr<CompositableClient>
+CompositableChild::GetCompositableClient()
+{
+  return mCompositableClient;
+}
+
+void
+CompositableChild::ActorDestroy(ActorDestroyReason)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+
+  mCanSend = false;
+
+  if (mCompositableClient) {
+    mCompositableClient->mCompositableChild = nullptr;
+    mCompositableClient = nullptr;
+  }
+}
+
+/* static */ PCompositableChild*
+AsyncCompositableChild::CreateActor()
+{
+  AsyncCompositableChild* child = new AsyncCompositableChild();
+  child->AddRef();
+  return child;
+}
+
+AsyncCompositableChild::AsyncCompositableChild()
+ : mLock("AsyncCompositableChild.mLock")
+{
+}
+
+AsyncCompositableChild::~AsyncCompositableChild()
+{
+}
+
+void
+AsyncCompositableChild::ActorDestroy(ActorDestroyReason)
+{
+  mCanSend = false;
+
+  // We do not revoke CompositableClient::mCompositableChild here, since that
+  // could race with the main thread.
+  RevokeCompositableClient();
+}
+
+void
+AsyncCompositableChild::RevokeCompositableClient()
+{
+  MutexAutoLock lock(mLock);
+  mCompositableClient = nullptr;
+}
+
+RefPtr<CompositableClient>
+AsyncCompositableChild::GetCompositableClient()
+{
+  MutexAutoLock lock(mLock);
+  return CompositableChild::GetCompositableClient();
+}
+
+} // namespace layers
+} // namespace mozilla