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1 /*
2  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 #ifndef WEBRTC_MODULES_DESKTOP_CAPTURE_WIN_SCOPED_THREAD_DESKTOP_H_
12 #define WEBRTC_MODULES_DESKTOP_CAPTURE_WIN_SCOPED_THREAD_DESKTOP_H_
13 
14 #include <windows.h>
15 
16 #include "webrtc/base/constructormagic.h"
17 #include "webrtc/base/scoped_ptr.h"
18 
19 namespace webrtc {
20 
21 class Desktop;
22 
23 class ScopedThreadDesktop {
24  public:
25   ScopedThreadDesktop();
26   ~ScopedThreadDesktop();
27 
28   // Returns true if |desktop| has the same desktop name as the currently
29   // assigned desktop (if assigned) or as the initial desktop (if not assigned).
30   // Returns false in any other case including failing Win32 APIs and
31   // uninitialized desktop handles.
32   bool IsSame(const Desktop& desktop);
33 
34   // Reverts the calling thread to use the initial desktop.
35   void Revert();
36 
37   // Assigns |desktop| to be the calling thread. Returns true if the thread has
38   // been switched to |desktop| successfully. Takes ownership of |desktop|.
39   bool SetThreadDesktop(Desktop* desktop);
40 
41  private:
42   // The desktop handle assigned to the calling thread by Set
43   rtc::scoped_ptr<Desktop> assigned_;
44 
45   // The desktop handle assigned to the calling thread at creation.
46   rtc::scoped_ptr<Desktop> initial_;
47 
48   RTC_DISALLOW_COPY_AND_ASSIGN(ScopedThreadDesktop);
49 };
50 
51 }  // namespace webrtc
52 
53 #endif  // WEBRTC_MODULES_DESKTOP_CAPTURE_WIN_SCOPED_THREAD_DESKTOP_H_
54