1 files changed, 63 insertions, 0 deletions
diff --git a/gfx/ipc/FileHandleWrapper.h b/gfx/ipc/FileHandleWrapper.h
new file mode 100644
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+++ b/gfx/ipc/FileHandleWrapper.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 _include_gfx_ipc_FileHandleWrapper_h__
+#define _include_gfx_ipc_FileHandleWrapper_h__
+
+#include "mozilla/UniquePtrExtensions.h"
+#include "nsISupportsImpl.h"
+
+namespace mozilla {
+
+namespace ipc {
+template <typename T>
+struct IPDLParamTraits;
+}  // namespace ipc
+
+namespace gfx {
+
+//
+// A class for sharing file handle or shared handle among multiple clients.
+//
+// The file handles or the shared handles consume system resources. The class
+// could reduce the number of shared handles in a process.
+//
+class FileHandleWrapper {
+  friend struct mozilla::ipc::IPDLParamTraits<gfx::FileHandleWrapper*>;
+
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(FileHandleWrapper);
+
+  explicit FileHandleWrapper(mozilla::UniqueFileHandle&& aHandle);
+
+  mozilla::detail::FileHandleType GetHandle();
+
+  mozilla::UniqueFileHandle ClonePlatformHandle();
+
+ protected:
+  ~FileHandleWrapper();
+
+  const mozilla::UniqueFileHandle mHandle;
+};
+
+struct FenceInfo {
+  FenceInfo() = default;
+  FenceInfo(FileHandleWrapper* aFenceHandle, uint64_t aFenceValue)
+      : mFenceHandle(aFenceHandle), mFenceValue(aFenceValue) {}
+
+  bool operator==(const FenceInfo& aOther) const {
+    return mFenceHandle == aOther.mFenceHandle &&
+           mFenceValue == aOther.mFenceValue;
+  }
+
+  RefPtr<FileHandleWrapper> mFenceHandle;
+  uint64_t mFenceValue = 0;
+};
+
+}  // namespace gfx
+}  // namespace mozilla
+
+#endif  // _include_gfx_ipc_FileHandleWrapper_h__