DirectX based screen capturer logic

webrtc/modules/desktop_capture/BUILD.gn

 # Copyright (c) 2014 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.
 
 import("//build/config/ui.gni")
 import("../../build/webrtc.gni")
@@ skipping 61 matching lines @@
     "shared_memory.h",
     "win/cursor.cc",
     "win/cursor.h",
     "win/desktop.cc",
     "win/desktop.h",
     "win/scoped_gdi_object.h",
     "win/scoped_thread_desktop.cc",
     "win/scoped_thread_desktop.h",
     "win/screen_capture_utils.cc",
     "win/screen_capture_utils.h",
+    "win/screen_capturer_win_directx.cc",
+    "win/screen_capturer_win_directx.h",
     "win/screen_capturer_win_gdi.cc",
     "win/screen_capturer_win_gdi.h",
     "win/screen_capturer_win_magnifier.cc",
     "win/screen_capturer_win_magnifier.h",
     "win/window_capture_utils.cc",
     "win/window_capture_utils.h",
     "window_capturer.h",
     "window_capturer_mac.mm",
     "window_capturer_win.cc",
   ]
@@ skipping 22 matching lines @@
   }
 
   if (is_mac) {
     libs = [
       "AppKit.framework",
       "IOKit.framework",
       "OpenGL.framework",
     ]
   }
 
+  if (is_win) {
+    libs = [
+      "d3d11.lib",
+      "shcore.lib",

[Sergey Ulanov, 2016/05/19 18:12:09]

Do we have shcore.dll on windows 7? AFAICT it's there only starting Win8, so it
will need to be loaded dynamically.

[Hzj_jie, 2016/05/19 21:20:28]

Considering this function does not provide extra benefit, I revert the change
and use HDC instead.

+    ]
+  }
+
   configs += [ "../..:common_config" ]
   public_configs = [ "../..:common_inherited_config" ]
 
   if (is_clang && !is_nacl) {
     # Suppress warnings from Chrome's Clang plugins.
     # See http://code.google.com/p/webrtc/issues/detail?id=163 for details.
     configs -= [ "//build/config/clang:find_bad_constructs" ]
   }
 
   deps = [
@@ skipping 18 matching lines @@
     ]
 
     configs += [ "../..:common_config" ]
     public_configs = [ "../..:common_inherited_config" ]
 
     if (is_posix && !is_mac) {
       cflags = [ "-msse2" ]
     }
   }
 }