Remove the requirement of D3D_FEATURE_LEVEL_11_0, but export the D3D_FEATURE_LEVEL through APIs

webrtc/modules/desktop_capture/win/dxgi_duplicator_controller.h

 /*
  *  Copyright (c) 2016 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 WEBRTC_MODULES_DESKTOP_CAPTURE_WIN_DXGI_DUPLICATOR_CONTROLLER_H_
 #define WEBRTC_MODULES_DESKTOP_CAPTURE_WIN_DXGI_DUPLICATOR_CONTROLLER_H_
 
+#include <D3DCommon.h>
+
 #include <memory>
 #include <vector>
 
 #include "webrtc/base/criticalsection.h"
 #include "webrtc/modules/desktop_capture/desktop_geometry.h"
 #include "webrtc/modules/desktop_capture/desktop_region.h"
 #include "webrtc/modules/desktop_capture/shared_desktop_frame.h"
 #include "webrtc/modules/desktop_capture/win/d3d_device.h"
 #include "webrtc/modules/desktop_capture/win/dxgi_adapter_duplicator.h"
 
@@ skipping 36 matching lines @@
   // Returns the singleton instance of DxgiDuplicatorController.
   static DxgiDuplicatorController* Instance();
 
   // Destructs current instance. We need to make sure COM components and their
   // containers are destructed in correct order.
   ~DxgiDuplicatorController();
 
   // Detects whether the system supports DXGI based capturer.
   bool IsSupported();
 
+  // Returns minimum and maximum D3D_FEATURE_LEVEL current system supports.
+  bool SupportedFeatureLevels(D3D_FEATURE_LEVEL* min_feature_level,
+                              D3D_FEATURE_LEVEL* max_feature_level);
+
   // Captures current screen and writes into target. Since we are using double
   // buffering, |last_frame|.updated_region() is used to represent the not
   // updated regions in current |target| frame, which should also be copied this
   // time.
   // TODO(zijiehe): Windows cannot guarantee the frames returned by each
   // IDXGIOutputDuplication are synchronized. But we are using a totally
   // different threading model than the way Windows suggested, it's hard to
   // synchronize them manually. We should find a way to do it.
   bool Duplicate(Context* context, SharedDesktopFrame* target);
 
@@ skipping 66 matching lines @@
 
   // This lock must be locked whenever accessing any of the following objects.
   rtc::CriticalSection lock_;
 
   // A self-incremented integer to compare with the one in Context, to
   // ensure a Context has been initialized after DxgiDuplicatorController.
   int identity_ = 0;
   DesktopRect desktop_rect_;
   DesktopVector dpi_;
   std::vector<DxgiAdapterDuplicator> duplicators_;
+  D3D_FEATURE_LEVEL min_feature_level_;
+  D3D_FEATURE_LEVEL max_feature_level_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_DESKTOP_CAPTURE_WIN_DXGI_DUPLICATOR_CONTROLLER_H_