win8/metro_driver/display_properties.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "stdafx.h"
   6
   7 #include <windows.h>
   8 #include <wrl\implements.h>
   9 #include <wrl\wrappers\corewrappers.h>
  10 #include <windows.foundation.h>
  11 #include <windows.graphics.display.h>
  12 #include "base/win/windows_version.h"
  13 #include "ui/gfx/win/dpi.h"
  14 #include "winrt_utils.h"
  15
  16 float GetModernUIScale() {
  17   if (base::win::GetVersion() >= base::win::VERSION_WIN8) {
  18     Microsoft::WRL::ComPtr<
  19         ABI::Windows::Graphics::Display::IDisplayPropertiesStatics>
  20         display_properties;
  21     if (SUCCEEDED(winrt_utils::CreateActivationFactory(
  22         RuntimeClass_Windows_Graphics_Display_DisplayProperties,
  23         display_properties.GetAddressOf()))) {
  24       ABI::Windows::Graphics::Display::ResolutionScale resolution_scale;
  25       if (SUCCEEDED(display_properties->get_ResolutionScale(&resolution_scale)))
  26         return static_cast<float>(resolution_scale) / 100.0f;
  27     }
  28   }
  29   return gfx::GetDPIScale();
  30 }