1 files changed, 46 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/desktop_capture/window_finder_win.cc b/third_party/libwebrtc/modules/desktop_capture/window_finder_win.cc
new file mode 100644
index 0000000000..a8c3d39e19
--- /dev/null
+++ b/third_party/libwebrtc/modules/desktop_capture/window_finder_win.cc
@@ -0,0 +1,46 @@
+/*
+ *  Copyright (c) 2017 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 "modules/desktop_capture/window_finder_win.h"
+
+#include <windows.h>
+
+#include <memory>
+
+namespace webrtc {
+
+WindowFinderWin::WindowFinderWin() = default;
+WindowFinderWin::~WindowFinderWin() = default;
+
+WindowId WindowFinderWin::GetWindowUnderPoint(DesktopVector point) {
+  HWND window = WindowFromPoint(POINT{point.x(), point.y()});
+  if (!window) {
+    return kNullWindowId;
+  }
+
+  // The difference between GA_ROOTOWNER and GA_ROOT can be found at
+  // https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/Hirr_DkuZdw.
+  // In short, we should use GA_ROOT, since we only care about the root window
+  // but not the owner.
+  window = GetAncestor(window, GA_ROOT);
+  if (!window) {
+    return kNullWindowId;
+  }
+
+  return reinterpret_cast<WindowId>(window);
+}
+
+// static
+std::unique_ptr<WindowFinder> WindowFinder::Create(
+    const WindowFinder::Options& options) {
+  return std::make_unique<WindowFinderWin>();
+}
+
+}  // namespace webrtc