Prepare ScreenWin To Use Per-Monitor DPI

base/win/win_util.cc

 // Copyright (c) 2012 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 "base/win/win_util.h"
 
 #include <aclapi.h>
 #include <cfgmgr32.h>
 #include <powrprof.h>
 #include <shobjidl.h>  // Must be before propkey.
 #include <initguid.h>
 #include <inspectable.h>
 #include <propkey.h>
 #include <propvarutil.h>
 #include <psapi.h>
 #include <roapi.h>
 #include <sddl.h>
 #include <setupapi.h>
+#include <shellscalingapi.h>
 #include <shlwapi.h>
 #include <signal.h>
 #include <stddef.h>
 #include <stdlib.h>
 #include <tchar.h> // Must be before tpcshrd.h or for any use of _T macro
 #include <tpcshrd.h>
 #include <uiviewsettingsinterop.h>
 #include <windows.ui.viewmanagement.h>
 #include <winstring.h>
 #include <wrl/wrappers/corewrappers.h>
@@ skipping 561 matching lines @@
 void EnableFlicks(HWND hwnd) {
   ::RemoveProp(hwnd, MICROSOFT_TABLETPENSERVICE_PROPERTY);
 }
 
 void DisableFlicks(HWND hwnd) {
   ::SetProp(hwnd, MICROSOFT_TABLETPENSERVICE_PROPERTY,
       reinterpret_cast<HANDLE>(TABLET_DISABLE_FLICKS |
           TABLET_DISABLE_FLICKFALLBACKKEYS));
 }
 
+bool IsProcessPerMonitorDpiAware() {
+  static enum class PerMonitorDpiAware {
+    UNKNOWN = 0,
+    PER_MONITOR_DPI_UNAWARE,
+    PER_MONITOR_DPI_AWARE,
+  } per_monitor_dpi_aware = PerMonitorDpiAware::UNKNOWN;

[oshima, 2016/06/27 18:58:52]

nit: new line would make it easier to read.

[robliao, 2016/06/27 19:07:31]

sgtm. Done.

+  if (per_monitor_dpi_aware == PerMonitorDpiAware::UNKNOWN) {
+    per_monitor_dpi_aware = PerMonitorDpiAware::PER_MONITOR_DPI_UNAWARE;
+    HMODULE shcore_dll = ::LoadLibrary(L"shcore.dll");
+    if (shcore_dll) {
+      auto get_process_dpi_awareness_func =
+          reinterpret_cast<decltype(::GetProcessDpiAwareness)*>(
+              ::GetProcAddress(shcore_dll, "GetProcessDpiAwareness"));
+      if (get_process_dpi_awareness_func) {
+        PROCESS_DPI_AWARENESS awareness;
+        if (SUCCEEDED(get_process_dpi_awareness_func(nullptr, &awareness)) &&
+            awareness == PROCESS_PER_MONITOR_DPI_AWARE)
+          per_monitor_dpi_aware = PerMonitorDpiAware::PER_MONITOR_DPI_AWARE;
+      }
+    }
+  }
+  return per_monitor_dpi_aware == PerMonitorDpiAware::PER_MONITOR_DPI_AWARE;
+}
+
 }  // namespace win
 }  // namespace base