1 files changed, 55 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/desktop_capture/win/scoped_thread_desktop.h b/third_party/libwebrtc/modules/desktop_capture/win/scoped_thread_desktop.h
new file mode 100644
index 0000000000..98f151a46c
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+++ b/third_party/libwebrtc/modules/desktop_capture/win/scoped_thread_desktop.h
@@ -0,0 +1,55 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef MODULES_DESKTOP_CAPTURE_WIN_SCOPED_THREAD_DESKTOP_H_
+#define MODULES_DESKTOP_CAPTURE_WIN_SCOPED_THREAD_DESKTOP_H_
+
+#include <windows.h>
+
+#include <memory>
+
+#include "rtc_base/system/rtc_export.h"
+
+namespace webrtc {
+
+class Desktop;
+
+class RTC_EXPORT ScopedThreadDesktop {
+ public:
+  ScopedThreadDesktop();
+  ~ScopedThreadDesktop();
+
+  ScopedThreadDesktop(const ScopedThreadDesktop&) = delete;
+  ScopedThreadDesktop& operator=(const ScopedThreadDesktop&) = delete;
+
+  // Returns true if `desktop` has the same desktop name as the currently
+  // assigned desktop (if assigned) or as the initial desktop (if not assigned).
+  // Returns false in any other case including failing Win32 APIs and
+  // uninitialized desktop handles.
+  bool IsSame(const Desktop& desktop);
+
+  // Reverts the calling thread to use the initial desktop.
+  void Revert();
+
+  // Assigns `desktop` to be the calling thread. Returns true if the thread has
+  // been switched to `desktop` successfully. Takes ownership of `desktop`.
+  bool SetThreadDesktop(Desktop* desktop);
+
+ private:
+  // The desktop handle assigned to the calling thread by Set
+  std::unique_ptr<Desktop> assigned_;
+
+  // The desktop handle assigned to the calling thread at creation.
+  std::unique_ptr<Desktop> initial_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_DESKTOP_CAPTURE_WIN_SCOPED_THREAD_DESKTOP_H_