1 files changed, 61 insertions, 0 deletions
diff --git a/gfx/layers/ipc/ImageContainerChild.h b/gfx/layers/ipc/ImageContainerChild.h
new file mode 100644
index 000000000..839540411
--- /dev/null
+++ b/gfx/layers/ipc/ImageContainerChild.h
@@ -0,0 +1,61 @@
+/* -*- 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/. */
+
+#ifndef mozilla_gfx_layers_ImageContainerChild_h
+#define mozilla_gfx_layers_ImageContainerChild_h
+
+#include "mozilla/Mutex.h"
+#include "mozilla/layers/PImageContainerChild.h"
+
+namespace mozilla {
+namespace layers {
+
+class ImageContainer;
+class ImageCompositeNotification;
+
+/**
+ * The child side of PImageContainer. It's best to avoid ImageContainer filling
+ * this role since IPDL objects should be associated with a single thread and
+ * ImageContainer definitely isn't. This object belongs to (and is always
+ * destroyed on) the ImageBridge thread, except when we need to destroy it
+ * during shutdown.
+ * An ImageContainer owns one of these; we have a weak reference to our
+ * ImageContainer.
+ */
+class ImageContainerChild final : public PImageContainerChild
+{
+public:
+  explicit ImageContainerChild(ImageContainer* aImageContainer);
+
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ImageContainerChild)
+
+  void RegisterWithIPDL();
+  void UnregisterFromIPDL();
+  void SendAsyncDelete();
+
+  void NotifyComposite(const ImageCompositeNotification& aNotification);
+  void ForgetImageContainer();
+
+private:
+  ~ImageContainerChild()
+  {}
+
+private:
+  Mutex mLock;
+  ImageContainer* mImageContainer;
+
+  // If mIPCOpen is false, it means the IPDL code tried to deallocate the actor
+  // before the ImageContainer released it. When this happens we don't actually
+  // delete the actor right away because the ImageContainer has a reference to
+  // it. In this case the actor will be deleted when the ImageContainer lets go
+  // of it.
+  // mIPCOpen must not be accessed off the ImageBridgeChild thread.
+  bool mIPCOpen;
+};
+
+} // namespace layers
+} // namespace mozilla
+
+#endif // mozilla_gfx_layers_ImageContainerChild_h