Move screen capturers from chromium to webrtc.

R=alexeypa@chromium.org, wez@chromium.org

Review URL: https://webrtc-codereview.appspot.com/1586005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4175 4adac7df-926f-26a2-2b94-8c16560cd09d

1 files changed, 57 insertions, 0 deletions

diff --git a/webrtc/modules/desktop_capture/win/scoped_thread_desktop.cc b/webrtc/modules/desktop_capture/win/scoped_thread_desktop.cc
new file mode 100644
index 0000000000..09648d7d32
--- /dev/null
+++ b/webrtc/modules/desktop_capture/win/scoped_thread_desktop.cc
@@ -0,0 +1,57 @@
+/*
+ *  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.
+ */
+
+#include "webrtc/modules/desktop_capture/win/scoped_thread_desktop.h"
+
+#include "webrtc/system_wrappers/interface/logging.h"
+
+#include "webrtc/modules/desktop_capture/win/desktop.h"
+
+namespace webrtc {
+
+ScopedThreadDesktop::ScopedThreadDesktop()
+    : initial_(Desktop::GetThreadDesktop()) {
+}
+
+ScopedThreadDesktop::~ScopedThreadDesktop() {
+  Revert();
+}
+
+bool ScopedThreadDesktop::IsSame(const Desktop& desktop) {
+  if (assigned_.get() != NULL) {
+    return assigned_->IsSame(desktop);
+  } else {
+    return initial_->IsSame(desktop);
+  }
+}
+
+void ScopedThreadDesktop::Revert() {
+  if (assigned_.get() != NULL) {
+    initial_->SetThreadDesktop();
+    assigned_.reset();
+  }
+}
+
+bool ScopedThreadDesktop::SetThreadDesktop(Desktop* desktop) {
+  Revert();
+
+  scoped_ptr<Desktop> scoped_desktop(desktop);
+
+  if (initial_->IsSame(*desktop))
+    return true;
+
+  if (!desktop->SetThreadDesktop())
+    return false;
+
+  assigned_.reset(scoped_desktop.release());
+  return true;
+}
+
+}  // namespace webrtc