ash/display/display_manager.cc

   1 // Copyright (c) 2012 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 "ash/display/display_manager.h"
   6
   7 #include <cmath>
   8 #include <set>
   9 #include <string>
  10 #include <vector>
  11
  12 #include "ash/ash_switches.h"
  13 #include "ash/display/display_layout_store.h"
  14 #include "ash/display/screen_ash.h"
  15 #include "ash/screen_util.h"
  16 #include "ash/shell.h"
  17 #include "base/auto_reset.h"
  18 #include "base/command_line.h"
  19 #include "base/logging.h"
  20 #include "base/metrics/histogram.h"
  21 #include "base/strings/string_number_conversions.h"
  22 #include "base/strings/string_split.h"
  23 #include "base/strings/stringprintf.h"
  24 #include "base/strings/utf_string_conversions.h"
  25 #include "grit/ash_strings.h"
  26 #include "ui/base/l10n/l10n_util.h"
  27 #include "ui/base/layout.h"
  28 #include "ui/base/resource/resource_bundle.h"
  29 #include "ui/gfx/display.h"
  30 #include "ui/gfx/display_observer.h"
  31 #include "ui/gfx/rect.h"
  32 #include "ui/gfx/screen.h"
  33 #include "ui/gfx/size_conversions.h"
  34
  35 #if defined(USE_X11)
  36 #include "ui/base/x/x11_util.h"
  37 #endif
  38
  39 #if defined(OS_CHROMEOS)
  40 #include "ash/display/display_configurator_animation.h"
  41 #include "base/sys_info.h"
  42 #endif
  43
  44 #if defined(OS_WIN)
  45 #include "base/win/windows_version.h"
  46 #endif
  47
  48 namespace ash {
  49 typedef std::vector<gfx::Display> DisplayList;
  50 typedef std::vector<DisplayInfo> DisplayInfoList;
  51
  52 namespace {
  53
  54 // We need to keep this in order for unittests to tell if
  55 // the object in gfx::Screen::GetScreenByType is for shutdown.
  56 gfx::Screen* screen_for_shutdown = NULL;
  57
  58 // The number of pixels to overlap between the primary and secondary displays,
  59 // in case that the offset value is too large.
  60 const int kMinimumOverlapForInvalidOffset = 100;
  61
  62 // List of value UI Scale values. Scales for 2x are equivalent to 640,
  63 // 800, 1024, 1280, 1440, 1600 and 1920 pixel width respectively on
  64 // 2560 pixel width 2x density display. Please see crbug.com/233375
  65 // for the full list of resolutions.
  66 const float kUIScalesFor2x[] =
  67     {0.5f, 0.625f, 0.8f, 1.0f, 1.125f, 1.25f, 1.5f, 2.0f};
  68 const float kUIScalesFor1280[] = {0.5f, 0.625f, 0.8f, 1.0f, 1.125f };
  69 const float kUIScalesFor1366[] = {0.5f, 0.6f, 0.75f, 1.0f, 1.125f };
  70
  71 struct DisplaySortFunctor {
  72   bool operator()(const gfx::Display& a, const gfx::Display& b) {
  73     return a.id() < b.id();
  74   }
  75 };
  76
  77 struct DisplayInfoSortFunctor {
  78   bool operator()(const DisplayInfo& a, const DisplayInfo& b) {
  79     return a.id() < b.id();
  80   }
  81 };
  82
  83 struct DisplayModeMatcher {
  84   DisplayModeMatcher(const gfx::Size& size) : size(size) {}
  85   bool operator()(const DisplayMode& mode) { return mode.size == size; }
  86   gfx::Size size;
  87 };
  88
  89 struct ScaleComparator {
  90   explicit ScaleComparator(float s) : scale(s) {}
  91
  92   bool operator()(float s) const {
  93     const float kEpsilon = 0.0001f;
  94     return std::abs(scale - s) < kEpsilon;
  95   }
  96   float scale;
  97 };
  98
  99 gfx::Display& GetInvalidDisplay() {
 100   static gfx::Display* invalid_display = new gfx::Display();
 101   return *invalid_display;
 102 }
 103
 104 void MaybeInitInternalDisplay(int64 id) {
 105   CommandLine* command_line = CommandLine::ForCurrentProcess();
 106   if (command_line->HasSwitch(switches::kAshUseFirstDisplayAsInternal))
 107     gfx::Display::SetInternalDisplayId(id);
 108 }
 109
 110 // Scoped objects used to either create or close the non desktop window
 111 // at specific timing.
 112 class NonDesktopDisplayUpdater {
 113  public:
 114   NonDesktopDisplayUpdater(DisplayManager* manager,
 115                            DisplayManager::Delegate* delegate)
 116       : manager_(manager),
 117         delegate_(delegate),
 118         enabled_(manager_->second_display_mode() != DisplayManager::EXTENDED &&
 119                  manager_->non_desktop_display().is_valid()) {
 120   }
 121
 122   ~NonDesktopDisplayUpdater() {
 123     if (!delegate_)
 124       return;
 125
 126     if (enabled_) {
 127       DisplayInfo display_info = manager_->GetDisplayInfo(
 128           manager_->non_desktop_display().id());
 129       delegate_->CreateOrUpdateNonDesktopDisplay(display_info);
 130     } else {
 131       delegate_->CloseNonDesktopDisplay();
 132     }
 133   }
 134
 135   bool enabled() const { return enabled_; }
 136
 137  private:
 138   DisplayManager* manager_;
 139   DisplayManager::Delegate* delegate_;
 140   bool enabled_;
 141   DISALLOW_COPY_AND_ASSIGN(NonDesktopDisplayUpdater);
 142 };
 143
 144 }  // namespace
 145
 146 using std::string;
 147 using std::vector;
 148
 149 DisplayManager::DisplayManager()
 150     : delegate_(NULL),
 151       screen_ash_(new ScreenAsh),
 152       screen_(screen_ash_.get()),
 153       layout_store_(new DisplayLayoutStore),
 154       first_display_id_(gfx::Display::kInvalidDisplayID),
 155       num_connected_displays_(0),
 156       force_bounds_changed_(false),
 157       change_display_upon_host_resize_(false),
 158       second_display_mode_(EXTENDED),
 159       mirrored_display_id_(gfx::Display::kInvalidDisplayID) {
 160 #if defined(OS_CHROMEOS)
 161   change_display_upon_host_resize_ = !base::SysInfo::IsRunningOnChromeOS();
 162 #endif
 163   DisplayInfo::SetAllowUpgradeToHighDPI(
 164       ui::ResourceBundle::GetSharedInstance().GetMaxScaleFactor() ==
 165       ui::SCALE_FACTOR_200P);
 166
 167   gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_ALTERNATE,
 168                                  screen_ash_.get());
 169   gfx::Screen* current_native =
 170       gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_NATIVE);
 171   // If there is no native, or the native was for shutdown,
 172   // use ash's screen.
 173   if (!current_native ||
 174       current_native == screen_for_shutdown) {
 175     gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE,
 176                                    screen_ash_.get());
 177   }
 178 }
 179
 180 DisplayManager::~DisplayManager() {
 181 }
 182
 183 // static
 184 std::vector<float> DisplayManager::GetScalesForDisplay(
 185     const DisplayInfo& info) {
 186   std::vector<float> ret;
 187   if (info.device_scale_factor() == 2.0f) {
 188     ret.assign(kUIScalesFor2x, kUIScalesFor2x + arraysize(kUIScalesFor2x));
 189     return ret;
 190   }
 191   switch (info.bounds_in_native().width()) {
 192     case 1280:
 193       ret.assign(kUIScalesFor1280,
 194                  kUIScalesFor1280 + arraysize(kUIScalesFor1280));
 195       break;
 196     case 1366:
 197       ret.assign(kUIScalesFor1366,
 198                  kUIScalesFor1366 + arraysize(kUIScalesFor1366));
 199       break;
 200     default:
 201       ret.assign(kUIScalesFor1280,
 202                  kUIScalesFor1280 + arraysize(kUIScalesFor1280));
 203 #if defined(OS_CHROMEOS)
 204       if (base::SysInfo::IsRunningOnChromeOS())
 205         NOTREACHED() << "Unknown resolution:" << info.ToString();
 206 #endif
 207   }
 208   return ret;
 209 }
 210
 211 // static
 212 float DisplayManager::GetNextUIScale(const DisplayInfo& info, bool up) {
 213   float scale = info.configured_ui_scale();
 214   std::vector<float> scales = GetScalesForDisplay(info);
 215   for (size_t i = 0; i < scales.size(); ++i) {
 216     if (ScaleComparator(scales[i])(scale)) {
 217       if (up && i != scales.size() - 1)
 218         return scales[i + 1];
 219       if (!up && i != 0)
 220         return scales[i - 1];
 221       return scales[i];
 222     }
 223   }
 224   // Fallback to 1.0f if the |scale| wasn't in the list.
 225   return 1.0f;
 226 }
 227
 228 bool DisplayManager::InitFromCommandLine() {
 229   DisplayInfoList info_list;
 230   CommandLine* command_line = CommandLine::ForCurrentProcess();
 231   if (!command_line->HasSwitch(switches::kAshHostWindowBounds))
 232     return false;
 233   const string size_str =
 234       command_line->GetSwitchValueASCII(switches::kAshHostWindowBounds);
 235   vector<string> parts;
 236   base::SplitString(size_str, ',', &parts);
 237   for (vector<string>::const_iterator iter = parts.begin();
 238        iter != parts.end(); ++iter) {
 239     info_list.push_back(DisplayInfo::CreateFromSpec(*iter));
 240   }
 241   MaybeInitInternalDisplay(info_list[0].id());
 242   if (info_list.size() > 1 &&
 243       command_line->HasSwitch(switches::kAshEnableSoftwareMirroring)) {
 244     SetSecondDisplayMode(MIRRORING);
 245   }
 246   OnNativeDisplaysChanged(info_list);
 247   return true;
 248 }
 249
 250 void DisplayManager::InitDefaultDisplay() {
 251   DisplayInfoList info_list;
 252   info_list.push_back(DisplayInfo::CreateFromSpec(std::string()));
 253   MaybeInitInternalDisplay(info_list[0].id());
 254   OnNativeDisplaysChanged(info_list);
 255 }
 256
 257 // static
 258 void DisplayManager::UpdateDisplayBoundsForLayoutById(
 259     const DisplayLayout& layout,
 260     const gfx::Display& primary_display,
 261     int64 secondary_display_id) {
 262   DCHECK_NE(gfx::Display::kInvalidDisplayID, secondary_display_id);
 263   UpdateDisplayBoundsForLayout(
 264       layout, primary_display,
 265       Shell::GetInstance()->display_manager()->
 266       FindDisplayForId(secondary_display_id));
 267 }
 268
 269 bool DisplayManager::IsActiveDisplay(const gfx::Display& display) const {
 270   for (DisplayList::const_iterator iter = displays_.begin();
 271        iter != displays_.end(); ++iter) {
 272     if ((*iter).id() == display.id())
 273       return true;
 274   }
 275   return false;
 276 }
 277
 278 bool DisplayManager::HasInternalDisplay() const {
 279   return gfx::Display::InternalDisplayId() != gfx::Display::kInvalidDisplayID;
 280 }
 281
 282 bool DisplayManager::IsInternalDisplayId(int64 id) const {
 283   return gfx::Display::InternalDisplayId() == id;
 284 }
 285
 286 DisplayLayout DisplayManager::GetCurrentDisplayLayout() {
 287   DCHECK_EQ(2U, num_connected_displays());
 288   // Invert if the primary was swapped.
 289   if (num_connected_displays() > 1) {
 290     DisplayIdPair pair = GetCurrentDisplayIdPair();
 291     return layout_store_->ComputeDisplayLayoutForDisplayIdPair(pair);
 292   }
 293   NOTREACHED() << "DisplayLayout is requested for single display";
 294   // On release build, just fallback to default instead of blowing up.
 295   DisplayLayout layout =
 296       layout_store_->default_display_layout();
 297   layout.primary_id = displays_[0].id();
 298   return layout;
 299 }
 300
 301 DisplayIdPair DisplayManager::GetCurrentDisplayIdPair() const {
 302   if (IsMirrored()) {
 303     if (software_mirroring_enabled()) {
 304       CHECK_EQ(2u, num_connected_displays());
 305       // This comment is to make it easy to distinguish the crash
 306       // between two checks.
 307       CHECK_EQ(1u, displays_.size());
 308     }
 309     return std::make_pair(displays_[0].id(), mirrored_display_id_);
 310   } else {
 311     CHECK_GE(2u, displays_.size());
 312     int64 id_at_zero = displays_[0].id();
 313     if (id_at_zero == gfx::Display::InternalDisplayId() ||
 314         id_at_zero == first_display_id()) {
 315       return std::make_pair(id_at_zero, displays_[1].id());
 316     } else {
 317       return std::make_pair(displays_[1].id(), id_at_zero);
 318     }
 319   }
 320 }
 321
 322 void DisplayManager::SetLayoutForCurrentDisplays(
 323     const DisplayLayout& layout_relative_to_primary) {
 324   DCHECK_EQ(2U, GetNumDisplays());
 325   if (GetNumDisplays() < 2)
 326     return;
 327   const gfx::Display& primary = screen_->GetPrimaryDisplay();
 328   const DisplayIdPair pair = GetCurrentDisplayIdPair();
 329   // Invert if the primary was swapped.
 330   DisplayLayout to_set = pair.first == primary.id() ?
 331       layout_relative_to_primary : layout_relative_to_primary.Invert();
 332
 333   DisplayLayout current_layout =
 334       layout_store_->GetRegisteredDisplayLayout(pair);
 335   if (to_set.position != current_layout.position ||
 336       to_set.offset != current_layout.offset) {
 337     to_set.primary_id = primary.id();
 338     layout_store_->RegisterLayoutForDisplayIdPair(
 339         pair.first, pair.second, to_set);
 340     if (delegate_)
 341       delegate_->PreDisplayConfigurationChange(false);
 342     // PreDisplayConfigurationChange(false);
 343     // TODO(oshima): Call UpdateDisplays instead.
 344     const DisplayLayout layout = GetCurrentDisplayLayout();
 345     UpdateDisplayBoundsForLayoutById(
 346         layout, primary,
 347         ScreenUtil::GetSecondaryDisplay().id());
 348
 349     // Primary's bounds stay the same. Just notify bounds change
 350     // on the secondary.
 351     screen_ash_->NotifyMetricsChanged(
 352         ScreenUtil::GetSecondaryDisplay(),
 353         gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS |
 354             gfx::DisplayObserver::DISPLAY_METRIC_WORK_AREA);
 355     if (delegate_)
 356       delegate_->PostDisplayConfigurationChange();
 357   }
 358 }
 359
 360 const gfx::Display& DisplayManager::GetDisplayForId(int64 id) const {
 361   gfx::Display* display =
 362       const_cast<DisplayManager*>(this)->FindDisplayForId(id);
 363   return display ? *display : GetInvalidDisplay();
 364 }
 365
 366 const gfx::Display& DisplayManager::FindDisplayContainingPoint(
 367     const gfx::Point& point_in_screen) const {
 368   for (DisplayList::const_iterator iter = displays_.begin();
 369        iter != displays_.end(); ++iter) {
 370     const gfx::Display& display = *iter;
 371     if (display.bounds().Contains(point_in_screen))
 372       return display;
 373   }
 374   return GetInvalidDisplay();
 375 }
 376
 377 bool DisplayManager::UpdateWorkAreaOfDisplay(int64 display_id,
 378                                              const gfx::Insets& insets) {
 379   gfx::Display* display = FindDisplayForId(display_id);
 380   DCHECK(display);
 381   gfx::Rect old_work_area = display->work_area();
 382   display->UpdateWorkAreaFromInsets(insets);
 383   return old_work_area != display->work_area();
 384 }
 385
 386 void DisplayManager::SetOverscanInsets(int64 display_id,
 387                                        const gfx::Insets& insets_in_dip) {
 388   display_info_[display_id].SetOverscanInsets(insets_in_dip);
 389   DisplayInfoList display_info_list;
 390   for (DisplayList::const_iterator iter = displays_.begin();
 391        iter != displays_.end(); ++iter) {
 392     display_info_list.push_back(GetDisplayInfo(iter->id()));
 393   }
 394   AddMirrorDisplayInfoIfAny(&display_info_list);
 395   UpdateDisplays(display_info_list);
 396 }
 397
 398 void DisplayManager::SetDisplayRotation(int64 display_id,
 399                                         gfx::Display::Rotation rotation) {
 400   DisplayInfoList display_info_list;
 401   for (DisplayList::const_iterator iter = displays_.begin();
 402        iter != displays_.end(); ++iter) {
 403     DisplayInfo info = GetDisplayInfo(iter->id());
 404     if (info.id() == display_id) {
 405       if (info.rotation() == rotation)
 406         return;
 407       info.set_rotation(rotation);
 408     }
 409     display_info_list.push_back(info);
 410   }
 411   AddMirrorDisplayInfoIfAny(&display_info_list);
 412   if (virtual_keyboard_root_window_enabled() &&
 413       display_id == non_desktop_display_.id()) {
 414     DisplayInfo info = GetDisplayInfo(display_id);
 415     info.set_rotation(rotation);
 416     display_info_list.push_back(info);
 417   }
 418   UpdateDisplays(display_info_list);
 419 }
 420
 421 void DisplayManager::SetDisplayUIScale(int64 display_id,
 422                                        float ui_scale) {
 423   if (!IsDisplayUIScalingEnabled() ||
 424       gfx::Display::InternalDisplayId() != display_id) {
 425     return;
 426   }
 427
 428   DisplayInfoList display_info_list;
 429   for (DisplayList::const_iterator iter = displays_.begin();
 430        iter != displays_.end(); ++iter) {
 431     DisplayInfo info = GetDisplayInfo(iter->id());
 432     if (info.id() == display_id) {
 433       if (info.configured_ui_scale() == ui_scale)
 434         return;
 435       std::vector<float> scales = GetScalesForDisplay(info);
 436       ScaleComparator comparator(ui_scale);
 437       if (std::find_if(scales.begin(), scales.end(), comparator) ==
 438           scales.end()) {
 439         return;
 440       }
 441       info.set_configured_ui_scale(ui_scale);
 442     }
 443     display_info_list.push_back(info);
 444   }
 445   AddMirrorDisplayInfoIfAny(&display_info_list);
 446   UpdateDisplays(display_info_list);
 447 }
 448
 449 void DisplayManager::SetDisplayResolution(int64 display_id,
 450                                           const gfx::Size& resolution) {
 451   DCHECK_NE(gfx::Display::InternalDisplayId(), display_id);
 452   if (gfx::Display::InternalDisplayId() == display_id)
 453     return;
 454   const DisplayInfo& display_info = GetDisplayInfo(display_id);
 455   const std::vector<DisplayMode>& modes = display_info.display_modes();
 456   DCHECK_NE(0u, modes.size());
 457   std::vector<DisplayMode>::const_iterator iter =
 458       std::find_if(modes.begin(), modes.end(), DisplayModeMatcher(resolution));
 459   if (iter == modes.end()) {
 460     LOG(WARNING) << "Unsupported resolution was requested:"
 461                  << resolution.ToString();
 462     return;
 463   }
 464   display_modes_[display_id] = *iter;
 465 #if defined(OS_CHROMEOS)
 466   if (base::SysInfo::IsRunningOnChromeOS())
 467     Shell::GetInstance()->display_configurator()->OnConfigurationChanged();
 468 #endif
 469 }
 470
 471 void DisplayManager::RegisterDisplayProperty(
 472     int64 display_id,
 473     gfx::Display::Rotation rotation,
 474     float ui_scale,
 475     const gfx::Insets* overscan_insets,
 476     const gfx::Size& resolution_in_pixels,
 477     ui::ColorCalibrationProfile color_profile) {
 478   if (display_info_.find(display_id) == display_info_.end())
 479     display_info_[display_id] = DisplayInfo(display_id, std::string(), false);
 480
 481   display_info_[display_id].set_rotation(rotation);
 482   display_info_[display_id].SetColorProfile(color_profile);
 483   // Just in case the preference file was corrupted.
 484   if (0.5f <= ui_scale && ui_scale <= 2.0f)
 485     display_info_[display_id].set_configured_ui_scale(ui_scale);
 486   if (overscan_insets)
 487     display_info_[display_id].SetOverscanInsets(*overscan_insets);
 488   if (!resolution_in_pixels.IsEmpty()) {
 489     // Default refresh rate, until OnNativeDisplaysChanged() updates us with the
 490     // actual display info, is 60 Hz.
 491     display_modes_[display_id] =
 492         DisplayMode(resolution_in_pixels, 60.0f, false, false);
 493   }
 494 }
 495
 496 bool DisplayManager::GetSelectedModeForDisplayId(int64 id,
 497                                                  DisplayMode* mode_out) const {
 498   std::map<int64, DisplayMode>::const_iterator iter = display_modes_.find(id);
 499   if (iter == display_modes_.end())
 500     return false;
 501   *mode_out = iter->second;
 502   return true;
 503 }
 504
 505 bool DisplayManager::IsDisplayUIScalingEnabled() const {
 506   return GetDisplayIdForUIScaling() != gfx::Display::kInvalidDisplayID;
 507 }
 508
 509 gfx::Insets DisplayManager::GetOverscanInsets(int64 display_id) const {
 510   std::map<int64, DisplayInfo>::const_iterator it =
 511       display_info_.find(display_id);
 512   return (it != display_info_.end()) ?
 513       it->second.overscan_insets_in_dip() : gfx::Insets();
 514 }
 515
 516 void DisplayManager::SetColorCalibrationProfile(
 517     int64 display_id,
 518     ui::ColorCalibrationProfile profile) {
 519 #if defined(OS_CHROMEOS)
 520   if (!display_info_[display_id].IsColorProfileAvailable(profile))
 521     return;
 522
 523   if (delegate_)
 524     delegate_->PreDisplayConfigurationChange(false);
 525   // Just sets color profile if it's not running on ChromeOS (like tests).
 526   if (!base::SysInfo::IsRunningOnChromeOS() ||
 527       Shell::GetInstance()->display_configurator()->SetColorCalibrationProfile(
 528           display_id, profile)) {
 529     display_info_[display_id].SetColorProfile(profile);
 530     UMA_HISTOGRAM_ENUMERATION(
 531         "ChromeOS.Display.ColorProfile", profile, ui::NUM_COLOR_PROFILES);
 532   }
 533   if (delegate_)
 534     delegate_->PostDisplayConfigurationChange();
 535 #endif
 536 }
 537
 538 void DisplayManager::OnNativeDisplaysChanged(
 539     const std::vector<DisplayInfo>& updated_displays) {
 540   if (updated_displays.empty()) {
 541     VLOG(1) << "OnNativeDisplayChanged(0): # of current displays="
 542             << displays_.size();
 543     // If the device is booted without display, or chrome is started
 544     // without --ash-host-window-bounds on linux desktop, use the
 545     // default display.
 546     if (displays_.empty()) {
 547       std::vector<DisplayInfo> init_displays;
 548       init_displays.push_back(DisplayInfo::CreateFromSpec(std::string()));
 549       MaybeInitInternalDisplay(init_displays[0].id());
 550       OnNativeDisplaysChanged(init_displays);
 551     } else {
 552       // Otherwise don't update the displays when all displays are disconnected.
 553       // This happens when:
 554       // - the device is idle and powerd requested to turn off all displays.
 555       // - the device is suspended. (kernel turns off all displays)
 556       // - the internal display's brightness is set to 0 and no external
 557       //   display is connected.
 558       // - the internal display's brightness is 0 and external display is
 559       //   disconnected.
 560       // The display will be updated when one of displays is turned on, and the
 561       // display list will be updated correctly.
 562     }
 563     return;
 564   }
 565   first_display_id_ = updated_displays[0].id();
 566   std::set<gfx::Point> origins;
 567
 568   if (updated_displays.size() == 1) {
 569     VLOG(1) << "OnNativeDisplaysChanged(1):" << updated_displays[0].ToString();
 570   } else {
 571     VLOG(1) << "OnNativeDisplaysChanged(" << updated_displays.size()
 572             << ") [0]=" << updated_displays[0].ToString()
 573             << ", [1]=" << updated_displays[1].ToString();
 574   }
 575
 576   bool internal_display_connected = false;
 577   num_connected_displays_ = updated_displays.size();
 578   mirrored_display_id_ = gfx::Display::kInvalidDisplayID;
 579   non_desktop_display_ = gfx::Display();
 580   DisplayInfoList new_display_info_list;
 581   for (DisplayInfoList::const_iterator iter = updated_displays.begin();
 582        iter != updated_displays.end();
 583        ++iter) {
 584     if (!internal_display_connected)
 585       internal_display_connected = IsInternalDisplayId(iter->id());
 586     // Mirrored monitors have the same origins.
 587     gfx::Point origin = iter->bounds_in_native().origin();
 588     if (origins.find(origin) != origins.end()) {
 589       InsertAndUpdateDisplayInfo(*iter);
 590       mirrored_display_id_ = iter->id();
 591     } else {
 592       origins.insert(origin);
 593       new_display_info_list.push_back(*iter);
 594     }
 595
 596     const gfx::Size& resolution = iter->bounds_in_native().size();
 597     const std::vector<DisplayMode>& display_modes = iter->display_modes();
 598     // This is empty the displays are initialized from InitFromCommandLine.
 599     if (!display_modes.size())
 600       continue;
 601     std::vector<DisplayMode>::const_iterator display_modes_iter =
 602         std::find_if(display_modes.begin(),
 603                      display_modes.end(),
 604                      DisplayModeMatcher(resolution));
 605     // Update the actual resolution selected as the resolution request may fail.
 606     if (display_modes_iter == display_modes.end())
 607       display_modes_.erase(iter->id());
 608     else if (display_modes_.find(iter->id()) != display_modes_.end())
 609       display_modes_[iter->id()] = *display_modes_iter;
 610   }
 611   if (HasInternalDisplay() &&
 612       !internal_display_connected &&
 613       display_info_.find(gfx::Display::InternalDisplayId()) ==
 614       display_info_.end()) {
 615     DisplayInfo internal_display_info(
 616         gfx::Display::InternalDisplayId(),
 617         l10n_util::GetStringUTF8(IDS_ASH_INTERNAL_DISPLAY_NAME),
 618         false  /*Internal display must not have overscan */);
 619     internal_display_info.SetBounds(gfx::Rect(0, 0, 800, 600));
 620     display_info_[gfx::Display::InternalDisplayId()] = internal_display_info;
 621   }
 622   UpdateDisplays(new_display_info_list);
 623 }
 624
 625 void DisplayManager::UpdateDisplays() {
 626   DisplayInfoList display_info_list;
 627   for (DisplayList::const_iterator iter = displays_.begin();
 628        iter != displays_.end(); ++iter) {
 629     display_info_list.push_back(GetDisplayInfo(iter->id()));
 630   }
 631   AddMirrorDisplayInfoIfAny(&display_info_list);
 632   UpdateDisplays(display_info_list);
 633 }
 634
 635 void DisplayManager::UpdateDisplays(
 636     const std::vector<DisplayInfo>& updated_display_info_list) {
 637 #if defined(OS_WIN)
 638   DCHECK_EQ(1u, updated_display_info_list.size()) <<
 639       ": Multiple display test does not work on Windows bots. Please "
 640       "skip (don't disable) the test using SupportsMultipleDisplays()";
 641 #endif
 642
 643   DisplayInfoList new_display_info_list = updated_display_info_list;
 644   std::sort(displays_.begin(), displays_.end(), DisplaySortFunctor());
 645   std::sort(new_display_info_list.begin(),
 646             new_display_info_list.end(),
 647             DisplayInfoSortFunctor());
 648   DisplayList removed_displays;
 649   std::map<size_t, uint32_t> display_changes;
 650   std::vector<size_t> added_display_indices;
 651
 652   DisplayList::iterator curr_iter = displays_.begin();
 653   DisplayInfoList::const_iterator new_info_iter = new_display_info_list.begin();
 654
 655   DisplayList new_displays;
 656
 657   // Use the internal display or 1st as the mirror source, then scale
 658   // the root window so that it matches the external display's
 659   // resolution. This is necessary in order for scaling to work while
 660   // mirrored.
 661   int64 non_desktop_display_id = gfx::Display::kInvalidDisplayID;
 662
 663   if (second_display_mode_ != EXTENDED && new_display_info_list.size() == 2) {
 664     bool zero_is_source =
 665         first_display_id_ == new_display_info_list[0].id() ||
 666         gfx::Display::InternalDisplayId() == new_display_info_list[0].id();
 667     if (second_display_mode_ == MIRRORING) {
 668       mirrored_display_id_ = new_display_info_list[zero_is_source ? 1 : 0].id();
 669       non_desktop_display_id = mirrored_display_id_;
 670     } else {
 671       // TODO(oshima|bshe): The virtual keyboard is currently assigned to
 672       // the 1st display.
 673       non_desktop_display_id =
 674           new_display_info_list[zero_is_source ? 0 : 1].id();
 675     }
 676   }
 677
 678   while (curr_iter != displays_.end() ||
 679          new_info_iter != new_display_info_list.end()) {
 680     if (new_info_iter != new_display_info_list.end() &&
 681         non_desktop_display_id == new_info_iter->id()) {
 682       DisplayInfo info = *new_info_iter;
 683       info.SetOverscanInsets(gfx::Insets());
 684       InsertAndUpdateDisplayInfo(info);
 685       non_desktop_display_ =
 686           CreateDisplayFromDisplayInfoById(non_desktop_display_id);
 687       ++new_info_iter;
 688       // Remove existing external display if it is going to be used as
 689       // non desktop.
 690       if (curr_iter != displays_.end() &&
 691           curr_iter->id() == non_desktop_display_id) {
 692         removed_displays.push_back(*curr_iter);
 693         ++curr_iter;
 694       }
 695       continue;
 696     }
 697
 698     if (curr_iter == displays_.end()) {
 699       // more displays in new list.
 700       added_display_indices.push_back(new_displays.size());
 701       InsertAndUpdateDisplayInfo(*new_info_iter);
 702       new_displays.push_back(
 703           CreateDisplayFromDisplayInfoById(new_info_iter->id()));
 704       ++new_info_iter;
 705     } else if (new_info_iter == new_display_info_list.end()) {
 706       // more displays in current list.
 707       removed_displays.push_back(*curr_iter);
 708       ++curr_iter;
 709     } else if (curr_iter->id() == new_info_iter->id()) {
 710       const gfx::Display& current_display = *curr_iter;
 711       // Copy the info because |CreateDisplayFromInfo| updates the instance.
 712       const DisplayInfo current_display_info =
 713           GetDisplayInfo(current_display.id());
 714       InsertAndUpdateDisplayInfo(*new_info_iter);
 715       gfx::Display new_display =
 716           CreateDisplayFromDisplayInfoById(new_info_iter->id());
 717       const DisplayInfo& new_display_info = GetDisplayInfo(new_display.id());
 718
 719       uint32_t metrics = gfx::DisplayObserver::DISPLAY_METRIC_NONE;
 720
 721       // At that point the new Display objects we have are not entirely updated,
 722       // they are missing the translation related to the Display disposition in
 723       // the layout.
 724       // Using display.bounds() and display.work_area() would fail most of the
 725       // time.
 726       if (force_bounds_changed_ || (current_display_info.bounds_in_native() !=
 727                                     new_display_info.bounds_in_native()) ||
 728           (current_display_info.size_in_pixel() !=
 729            new_display.GetSizeInPixel())) {
 730         metrics |= gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS |
 731                    gfx::DisplayObserver::DISPLAY_METRIC_WORK_AREA;
 732       }
 733
 734       if (current_display.device_scale_factor() !=
 735           new_display.device_scale_factor()) {
 736         metrics |= gfx::DisplayObserver::DISPLAY_METRIC_DEVICE_SCALE_FACTOR;
 737       }
 738
 739       if (current_display.rotation() != new_display.rotation())
 740         metrics |= gfx::DisplayObserver::DISPLAY_METRIC_ROTATION;
 741
 742       if (metrics != gfx::DisplayObserver::DISPLAY_METRIC_NONE) {
 743         display_changes.insert(
 744             std::pair<size_t, uint32_t>(new_displays.size(), metrics));
 745       }
 746
 747       new_display.UpdateWorkAreaFromInsets(current_display.GetWorkAreaInsets());
 748       new_displays.push_back(new_display);
 749       ++curr_iter;
 750       ++new_info_iter;
 751     } else if (curr_iter->id() < new_info_iter->id()) {
 752       // more displays in current list between ids, which means it is deleted.
 753       removed_displays.push_back(*curr_iter);
 754       ++curr_iter;
 755     } else {
 756       // more displays in new list between ids, which means it is added.
 757       added_display_indices.push_back(new_displays.size());
 758       InsertAndUpdateDisplayInfo(*new_info_iter);
 759       new_displays.push_back(
 760           CreateDisplayFromDisplayInfoById(new_info_iter->id()));
 761       ++new_info_iter;
 762     }
 763   }
 764
 765   scoped_ptr<NonDesktopDisplayUpdater> non_desktop_display_updater(
 766       new NonDesktopDisplayUpdater(this, delegate_));
 767
 768   // Do not update |displays_| if there's nothing to be updated. Without this,
 769   // it will not update the display layout, which causes the bug
 770   // http://crbug.com/155948.
 771   if (display_changes.empty() && added_display_indices.empty() &&
 772       removed_displays.empty()) {
 773     return;
 774   }
 775   // Clear focus if the display has been removed, but don't clear focus if
 776   // the destkop has been moved from one display to another
 777   // (mirror -> docked, docked -> single internal).
 778   bool clear_focus =
 779       !removed_displays.empty() &&
 780       !(removed_displays.size() == 1 && added_display_indices.size() == 1);
 781   if (delegate_)
 782     delegate_->PreDisplayConfigurationChange(clear_focus);
 783
 784   size_t updated_index;
 785   if (UpdateSecondaryDisplayBoundsForLayout(&new_displays, &updated_index) &&
 786       std::find(added_display_indices.begin(),
 787                 added_display_indices.end(),
 788                 updated_index) == added_display_indices.end()) {
 789     uint32_t metrics = gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS |
 790                        gfx::DisplayObserver::DISPLAY_METRIC_WORK_AREA;
 791     if (display_changes.find(updated_index) != display_changes.end())
 792       metrics |= display_changes[updated_index];
 793
 794     display_changes[updated_index] = metrics;
 795   }
 796
 797   displays_ = new_displays;
 798
 799   base::AutoReset<bool> resetter(&change_display_upon_host_resize_, false);
 800
 801   // Temporarily add displays to be removed because display object
 802   // being removed are accessed during shutting down the root.
 803   displays_.insert(displays_.end(), removed_displays.begin(),
 804                    removed_displays.end());
 805
 806   for (DisplayList::const_reverse_iterator iter = removed_displays.rbegin();
 807        iter != removed_displays.rend(); ++iter) {
 808     screen_ash_->NotifyDisplayRemoved(displays_.back());
 809     displays_.pop_back();
 810   }
 811   // Close the non desktop window here to avoid creating two compositor on
 812   // one display.
 813   if (!non_desktop_display_updater->enabled())
 814     non_desktop_display_updater.reset();
 815   for (std::vector<size_t>::iterator iter = added_display_indices.begin();
 816        iter != added_display_indices.end(); ++iter) {
 817     screen_ash_->NotifyDisplayAdded(displays_[*iter]);
 818   }
 819   // Create the non destkop window after all displays are added so that
 820   // it can mirror the display newly added. This can happen when switching
 821   // from dock mode to software mirror mode.
 822   non_desktop_display_updater.reset();
 823   for (std::map<size_t, uint32_t>::iterator iter = display_changes.begin();
 824        iter != display_changes.end();
 825        ++iter) {
 826     screen_ash_->NotifyMetricsChanged(displays_[iter->first], iter->second);
 827   }
 828   if (delegate_)
 829     delegate_->PostDisplayConfigurationChange();
 830
 831 #if defined(USE_X11) && defined(OS_CHROMEOS)
 832   if (!display_changes.empty() && base::SysInfo::IsRunningOnChromeOS())
 833     ui::ClearX11DefaultRootWindow();
 834 #endif
 835 }
 836
 837 const gfx::Display& DisplayManager::GetDisplayAt(size_t index) const {
 838   DCHECK_LT(index, displays_.size());
 839   return displays_[index];
 840 }
 841
 842 const gfx::Display& DisplayManager::GetPrimaryDisplayCandidate() const {
 843   if (GetNumDisplays() == 1)
 844     return displays_[0];
 845   DisplayLayout layout = layout_store_->GetRegisteredDisplayLayout(
 846       GetCurrentDisplayIdPair());
 847   return GetDisplayForId(layout.primary_id);
 848 }
 849
 850 size_t DisplayManager::GetNumDisplays() const {
 851   return displays_.size();
 852 }
 853
 854 bool DisplayManager::IsMirrored() const {
 855   return mirrored_display_id_ != gfx::Display::kInvalidDisplayID;
 856 }
 857
 858 const DisplayInfo& DisplayManager::GetDisplayInfo(int64 display_id) const {
 859   DCHECK_NE(gfx::Display::kInvalidDisplayID, display_id);
 860
 861   std::map<int64, DisplayInfo>::const_iterator iter =
 862       display_info_.find(display_id);
 863   CHECK(iter != display_info_.end()) << display_id;
 864   return iter->second;
 865 }
 866
 867 std::string DisplayManager::GetDisplayNameForId(int64 id) {
 868   if (id == gfx::Display::kInvalidDisplayID)
 869     return l10n_util::GetStringUTF8(IDS_ASH_STATUS_TRAY_UNKNOWN_DISPLAY_NAME);
 870
 871   std::map<int64, DisplayInfo>::const_iterator iter = display_info_.find(id);
 872   if (iter != display_info_.end() && !iter->second.name().empty())
 873     return iter->second.name();
 874
 875   return base::StringPrintf("Display %d", static_cast<int>(id));
 876 }
 877
 878 int64 DisplayManager::GetDisplayIdForUIScaling() const {
 879   // UI Scaling is effective only on internal display.
 880   int64 display_id = gfx::Display::InternalDisplayId();
 881 #if defined(OS_WIN)
 882   display_id = first_display_id();
 883 #endif
 884   return display_id;
 885 }
 886
 887 void DisplayManager::SetMirrorMode(bool mirrored) {
 888   if (num_connected_displays() <= 1)
 889     return;
 890
 891 #if defined(OS_CHROMEOS)
 892   if (base::SysInfo::IsRunningOnChromeOS()) {
 893     ui::MultipleDisplayState new_state =
 894         mirrored ? ui::MULTIPLE_DISPLAY_STATE_DUAL_MIRROR :
 895                    ui::MULTIPLE_DISPLAY_STATE_DUAL_EXTENDED;
 896     Shell::GetInstance()->display_configurator()->SetDisplayMode(new_state);
 897     return;
 898   }
 899 #endif
 900   // This is fallback path to emulate mirroroing on desktop.
 901   SetSecondDisplayMode(mirrored ? MIRRORING : EXTENDED);
 902   DisplayInfoList display_info_list;
 903   int count = 0;
 904   for (std::map<int64, DisplayInfo>::const_iterator iter =
 905            display_info_.begin();
 906        count < 2; ++iter, ++count) {
 907     display_info_list.push_back(GetDisplayInfo(iter->second.id()));
 908   }
 909   UpdateDisplays(display_info_list);
 910 #if defined(OS_CHROMEOS)
 911   if (Shell::GetInstance()->display_configurator_animation()) {
 912     Shell::GetInstance()->display_configurator_animation()->
 913         StartFadeInAnimation();
 914   }
 915 #endif
 916 }
 917
 918 void DisplayManager::AddRemoveDisplay() {
 919   DCHECK(!displays_.empty());
 920   std::vector<DisplayInfo> new_display_info_list;
 921   const DisplayInfo& first_display = GetDisplayInfo(displays_[0].id());
 922   new_display_info_list.push_back(first_display);
 923   // Add if there is only one display connected.
 924   if (num_connected_displays() == 1) {
 925     // Layout the 2nd display below the primary as with the real device.
 926     gfx::Rect host_bounds = first_display.bounds_in_native();
 927     new_display_info_list.push_back(DisplayInfo::CreateFromSpec(
 928         base::StringPrintf(
 929             "%d+%d-500x400", host_bounds.x(), host_bounds.bottom())));
 930   }
 931   num_connected_displays_ = new_display_info_list.size();
 932   mirrored_display_id_ = gfx::Display::kInvalidDisplayID;
 933   non_desktop_display_ = gfx::Display();
 934   UpdateDisplays(new_display_info_list);
 935 }
 936
 937 void DisplayManager::ToggleDisplayScaleFactor() {
 938   DCHECK(!displays_.empty());
 939   std::vector<DisplayInfo> new_display_info_list;
 940   for (DisplayList::const_iterator iter = displays_.begin();
 941        iter != displays_.end(); ++iter) {
 942     DisplayInfo display_info = GetDisplayInfo(iter->id());
 943     display_info.set_device_scale_factor(
 944         display_info.device_scale_factor() == 1.0f ? 2.0f : 1.0f);
 945     new_display_info_list.push_back(display_info);
 946   }
 947   AddMirrorDisplayInfoIfAny(&new_display_info_list);
 948   UpdateDisplays(new_display_info_list);
 949 }
 950
 951 #if defined(OS_CHROMEOS)
 952 void DisplayManager::SetSoftwareMirroring(bool enabled) {
 953   // TODO(oshima|bshe): Support external display on the system
 954   // that has virtual keyboard display.
 955   if (second_display_mode_ == VIRTUAL_KEYBOARD)
 956     return;
 957   SetSecondDisplayMode(enabled ? MIRRORING : EXTENDED);
 958 }
 959
 960 bool DisplayManager::SoftwareMirroringEnabled() const {
 961   return software_mirroring_enabled();
 962 }
 963 #endif
 964
 965 void DisplayManager::SetSecondDisplayMode(SecondDisplayMode mode) {
 966   second_display_mode_ = mode;
 967   mirrored_display_id_ = gfx::Display::kInvalidDisplayID;
 968   non_desktop_display_ = gfx::Display();
 969 }
 970
 971 bool DisplayManager::UpdateDisplayBounds(int64 display_id,
 972                                          const gfx::Rect& new_bounds) {
 973   if (change_display_upon_host_resize_) {
 974     display_info_[display_id].SetBounds(new_bounds);
 975     // Don't notify observers if the mirrored window has changed.
 976     if (software_mirroring_enabled() && mirrored_display_id_ == display_id)
 977       return false;
 978     gfx::Display* display = FindDisplayForId(display_id);
 979     display->SetSize(display_info_[display_id].size_in_pixel());
 980     screen_ash_->NotifyMetricsChanged(
 981         *display, gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS);
 982     return true;
 983   }
 984   return false;
 985 }
 986
 987 void DisplayManager::CreateMirrorWindowIfAny() {
 988   NonDesktopDisplayUpdater updater(this, delegate_);
 989 }
 990
 991 void DisplayManager::CreateScreenForShutdown() const {
 992   bool native_is_ash =
 993       gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_NATIVE) ==
 994       screen_ash_.get();
 995   delete screen_for_shutdown;
 996   screen_for_shutdown = screen_ash_->CloneForShutdown();
 997   gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_ALTERNATE,
 998                                  screen_for_shutdown);
 999   if (native_is_ash) {
1000     gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE,
1001                                    screen_for_shutdown);
1002   }
1003 }
1004
1005 gfx::Display* DisplayManager::FindDisplayForId(int64 id) {
1006   for (DisplayList::iterator iter = displays_.begin();
1007        iter != displays_.end(); ++iter) {
1008     if ((*iter).id() == id)
1009       return &(*iter);
1010   }
1011   DLOG(WARNING) << "Could not find display:" << id;
1012   return NULL;
1013 }
1014
1015 void DisplayManager::AddMirrorDisplayInfoIfAny(
1016     std::vector<DisplayInfo>* display_info_list) {
1017   if (software_mirroring_enabled() && IsMirrored())
1018     display_info_list->push_back(GetDisplayInfo(mirrored_display_id_));
1019 }
1020
1021 void DisplayManager::InsertAndUpdateDisplayInfo(const DisplayInfo& new_info) {
1022   std::map<int64, DisplayInfo>::iterator info =
1023       display_info_.find(new_info.id());
1024   if (info != display_info_.end()) {
1025     info->second.Copy(new_info);
1026   } else {
1027     display_info_[new_info.id()] = new_info;
1028     display_info_[new_info.id()].set_native(false);
1029   }
1030   display_info_[new_info.id()].UpdateDisplaySize();
1031
1032   OnDisplayInfoUpdated(display_info_[new_info.id()]);
1033 }
1034
1035 void DisplayManager::OnDisplayInfoUpdated(const DisplayInfo& display_info) {
1036 #if defined(OS_CHROMEOS)
1037   ui::ColorCalibrationProfile color_profile = display_info.color_profile();
1038   if (color_profile != ui::COLOR_PROFILE_STANDARD) {
1039     Shell::GetInstance()->display_configurator()->SetColorCalibrationProfile(
1040         display_info.id(), color_profile);
1041   }
1042 #endif
1043 }
1044
1045 gfx::Display DisplayManager::CreateDisplayFromDisplayInfoById(int64 id) {
1046   DCHECK(display_info_.find(id) != display_info_.end());
1047   const DisplayInfo& display_info = display_info_[id];
1048
1049   gfx::Display new_display(display_info.id());
1050   gfx::Rect bounds_in_native(display_info.size_in_pixel());
1051   float device_scale_factor = display_info.GetEffectiveDeviceScaleFactor();
1052
1053   // Simply set the origin to (0,0).  The primary display's origin is
1054   // always (0,0) and the secondary display's bounds will be updated
1055   // in |UpdateSecondaryDisplayBoundsForLayout| called in |UpdateDisplay|.
1056   new_display.SetScaleAndBounds(
1057       device_scale_factor, gfx::Rect(bounds_in_native.size()));
1058   new_display.set_rotation(display_info.rotation());
1059   new_display.set_touch_support(display_info.touch_support());
1060   return new_display;
1061 }
1062
1063 bool DisplayManager::UpdateSecondaryDisplayBoundsForLayout(
1064     DisplayList* displays,
1065     size_t* updated_index) const {
1066   if (displays->size() != 2U)
1067     return false;
1068
1069   int64 id_at_zero = displays->at(0).id();
1070   DisplayIdPair pair =
1071       (id_at_zero == first_display_id_ ||
1072        id_at_zero == gfx::Display::InternalDisplayId()) ?
1073       std::make_pair(id_at_zero, displays->at(1).id()) :
1074       std::make_pair(displays->at(1).id(), id_at_zero);
1075   DisplayLayout layout =
1076       layout_store_->ComputeDisplayLayoutForDisplayIdPair(pair);
1077
1078   // Ignore if a user has a old format (should be extremely rare)
1079   // and this will be replaced with DCHECK.
1080   if (layout.primary_id != gfx::Display::kInvalidDisplayID) {
1081     size_t primary_index, secondary_index;
1082     if (displays->at(0).id() == layout.primary_id) {
1083       primary_index = 0;
1084       secondary_index = 1;
1085     } else {
1086       primary_index = 1;
1087       secondary_index = 0;
1088     }
1089     // This function may be called before the secondary display is
1090     // registered. The bounds is empty in that case and will
1091     // return true.
1092     gfx::Rect bounds =
1093         GetDisplayForId(displays->at(secondary_index).id()).bounds();
1094     UpdateDisplayBoundsForLayout(
1095         layout, displays->at(primary_index), &displays->at(secondary_index));
1096     *updated_index = secondary_index;
1097     return bounds != displays->at(secondary_index).bounds();
1098   }
1099   return false;
1100 }
1101
1102 // static
1103 void DisplayManager::UpdateDisplayBoundsForLayout(
1104     const DisplayLayout& layout,
1105     const gfx::Display& primary_display,
1106     gfx::Display* secondary_display) {
1107   DCHECK_EQ("0,0", primary_display.bounds().origin().ToString());
1108
1109   const gfx::Rect& primary_bounds = primary_display.bounds();
1110   const gfx::Rect& secondary_bounds = secondary_display->bounds();
1111   gfx::Point new_secondary_origin = primary_bounds.origin();
1112
1113   DisplayLayout::Position position = layout.position;
1114
1115   // Ignore the offset in case the secondary display doesn't share edges with
1116   // the primary display.
1117   int offset = layout.offset;
1118   if (position == DisplayLayout::TOP || position == DisplayLayout::BOTTOM) {
1119     offset = std::min(
1120         offset, primary_bounds.width() - kMinimumOverlapForInvalidOffset);
1121     offset = std::max(
1122         offset, -secondary_bounds.width() + kMinimumOverlapForInvalidOffset);
1123   } else {
1124     offset = std::min(
1125         offset, primary_bounds.height() - kMinimumOverlapForInvalidOffset);
1126     offset = std::max(
1127         offset, -secondary_bounds.height() + kMinimumOverlapForInvalidOffset);
1128   }
1129   switch (position) {
1130     case DisplayLayout::TOP:
1131       new_secondary_origin.Offset(offset, -secondary_bounds.height());
1132       break;
1133     case DisplayLayout::RIGHT:
1134       new_secondary_origin.Offset(primary_bounds.width(), offset);
1135       break;
1136     case DisplayLayout::BOTTOM:
1137       new_secondary_origin.Offset(offset, primary_bounds.height());
1138       break;
1139     case DisplayLayout::LEFT:
1140       new_secondary_origin.Offset(-secondary_bounds.width(), offset);
1141       break;
1142   }
1143   gfx::Insets insets = secondary_display->GetWorkAreaInsets();
1144   secondary_display->set_bounds(
1145       gfx::Rect(new_secondary_origin, secondary_bounds.size()));
1146   secondary_display->UpdateWorkAreaFromInsets(insets);
1147 }
1148
1149 }  // namespace ash