Updates subpixel positioning and hinting when DSF is changed

ash/display/display_manager.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 "ash/display/display_manager.h"
 
 #include <algorithm>
 #include <cmath>
 #include <set>
 #include <string>
@@ skipping 219 matching lines @@
 }
 
 void DisplayManager::InitDefaultDisplay() {
   DisplayInfoList info_list;
   info_list.push_back(DisplayInfo::CreateFromSpec(std::string()));
   info_list.back().set_native(true);
   MaybeInitInternalDisplay(info_list[0].id());
   OnNativeDisplaysChanged(info_list);
 }
 
-void DisplayManager::InitFontParams() {
+void DisplayManager::RefreshFontParams() {
 #if defined(OS_CHROMEOS)
-  if (!HasInternalDisplay())
-    return;
-  const DisplayInfo& display_info =
-      GetDisplayInfo(gfx::Display::InternalDisplayId());
-  gfx::SetFontRenderParamsDeviceScaleFactor(
-      display_info.GetEffectiveDeviceScaleFactor());
+  float device_scale_factor = 1.0f;
+  if (HasInternalDisplay()) {
+    device_scale_factor = GetDisplayInfo(gfx::Display::InternalDisplayId())
+                              .GetEffectiveDeviceScaleFactor();
+  }
+  gfx::SetFontRenderParamsDeviceScaleFactor(device_scale_factor);
 #endif  // OS_CHROMEOS
 }
 
 // static
 void DisplayManager::UpdateDisplayBoundsForLayoutById(
     const DisplayLayout& layout,
     const gfx::Display& primary_display,
     int64 secondary_display_id) {
   DCHECK_NE(gfx::Display::kInvalidDisplayID, secondary_display_id);
   UpdateDisplayBoundsForLayout(
@@ skipping 639 matching lines @@
         if (display_changes.find(updated_index) != display_changes.end())
           metrics |= display_changes[updated_index];
 
         display_changes[updated_index] = metrics;
       }
     }
   }
 
   displays_ = new_displays;
 
+  RefreshFontParams();
   base::AutoReset<bool> resetter(&change_display_upon_host_resize_, false);
 
   // Temporarily add displays to be removed because display object
   // being removed are accessed during shutting down the root.
   displays_.insert(displays_.end(), removed_displays.begin(),
                    removed_displays.end());
 
   for (DisplayList::const_reverse_iterator iter = removed_displays.rbegin();
        iter != removed_displays.rend(); ++iter) {
     screen_ash_->NotifyDisplayRemoved(displays_.back());
@@ skipping 393 matching lines @@
       new_secondary_origin.Offset(-secondary_bounds.width(), offset);
       break;
   }
   gfx::Insets insets = secondary_display->GetWorkAreaInsets();
   secondary_display->set_bounds(
       gfx::Rect(new_secondary_origin, secondary_bounds.size()));
   secondary_display->UpdateWorkAreaFromInsets(insets);
 }
 
 }  // namespace ash