Metro/HiDPI: Move 1x icons into separate pak file

ui/base/resource/resource_bundle_win.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 "ui/base/resource/resource_bundle_win.h"
 
 #include "base/logging.h"
+#include "base/path_service.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/base/resource/resource_data_dll_win.h"
+#include "ui/base/win/dpi.h"
 
 namespace ui {
 
 namespace {
 
 HINSTANCE resources_data_dll;
 
 HINSTANCE GetCurrentResourceDLL() {
   if (resources_data_dll)
     return resources_data_dll;
   return GetModuleHandle(NULL);
 }
 
+FilePath GetResourcesPakFilePath(const std::string& pak_name) {
+  FilePath path;
+  if (PathService::Get(base::DIR_MODULE, &path))
+    return path.AppendASCII(pak_name.c_str());
+  return FilePath();
+}
+
 }  // end anonymous namespace
 
 void ResourceBundle::LoadCommonResources() {
   // As a convenience, add the current resource module as a data packs.
   data_packs_.push_back(new ResourceDataDLL(GetCurrentResourceDLL()));
+
+  bool use_hidpi_pak = false;
+#if defined(ENABLE_HIDPI)
+  // If we're running in HiDPI mode then use the 2x resource for DPI greater
+  // than 1.5. Otherwise use the 1x resource.
+  use_hidpi_pak = ui::GetDPIScale() > 1.5;
+#endif
+
+  if (!use_hidpi_pak) {
+    AddDataPack(GetResourcesPakFilePath("theme_resources_standard.pak"));
+    AddDataPack(GetResourcesPakFilePath("ui_resources_standard.pak"));
+  } else {
+    AddDataPack(GetResourcesPakFilePath("theme_resources_2x.pak"));
+    AddDataPack(GetResourcesPakFilePath("ui_resources_2x.pak"));
+  }
 }
 
 gfx::Image& ResourceBundle::GetNativeImageNamed(int resource_id, ImageRTL rtl) {
   // Flipped image is not used on Windows.
   DCHECK_EQ(rtl, RTL_DISABLED);
 
   // Windows only uses SkBitmap for gfx::Image, so this is the same as
   // GetImageNamed.
   return GetImageNamed(resource_id);
 }
 
 void SetResourcesDataDLL(HINSTANCE handle) {
   resources_data_dll = handle;
 }
 
 HICON LoadThemeIconFromResourcesDataDLL(int icon_id) {
   return ::LoadIcon(GetCurrentResourceDLL(), MAKEINTRESOURCE(icon_id));
 }
 
 }  // namespace ui;