Third part of porting Chrome Ash to Windows 7

win8/metro_driver/display_properties.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "stdafx.h"
 
 #include <windows.h>
 #include <wrl\implements.h>
 #include <wrl\wrappers\corewrappers.h>
 #include <windows.foundation.h>
 #include <windows.graphics.display.h>
 #include "base/win/scoped_com_initializer.h"
+#include "base/win/windows_version.h"
 #include "winrt_utils.h"
 
 #pragma comment(lib, "runtimeobject.lib")
 
 extern "C" {
 
 __declspec(dllexport) float GetModernUIScale() {
+  if (base::win::GetVersion() < base::win::VERSION_WIN8)

[ananta, 2014/04/11 02:25:24]

Please put a todo here to return the correct dpi scale. A bug would be great.

+    return 1.0f;
+
   base::win::ScopedCOMInitializer com_init;
   Microsoft::WRL::ComPtr<
       ABI::Windows::Graphics::Display::IDisplayPropertiesStatics>
       display_properties;
   if (SUCCEEDED(winrt_utils::CreateActivationFactory(
       RuntimeClass_Windows_Graphics_Display_DisplayProperties,
       display_properties.GetAddressOf()))) {
     ABI::Windows::Graphics::Display::ResolutionScale resolution_scale;
     if (SUCCEEDED(display_properties->get_ResolutionScale(&resolution_scale)))
       return static_cast<float>(resolution_scale) / 100.0f;
   }
   return 1.0f;
 }
 
 }