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 <algorithm>
   8 #include <cmath>
   9 #include <set>
  10 #include <string>
  11 #include <vector>
  12
  13 #include "ash/ash_switches.h"
  14 #include "ash/display/display_layout_store.h"
  15 #include "ash/display/display_util.h"
  16 #include "ash/display/extended_mouse_warp_controller.h"
  17 #include "ash/display/null_mouse_warp_controller.h"
  18 #include "ash/display/screen_ash.h"
  19 #include "ash/display/unified_mouse_warp_controller.h"
  20 #include "ash/screen_util.h"
  21 #include "ash/shell.h"
  22 #include "base/auto_reset.h"
  23 #include "base/command_line.h"
  24 #include "base/logging.h"
  25 #include "base/metrics/histogram.h"
  26 #include "base/run_loop.h"
  27 #include "base/strings/string_number_conversions.h"
  28 #include "base/strings/string_split.h"
  29 #include "base/strings/stringprintf.h"
  30 #include "base/strings/utf_string_conversions.h"
  31 #include "grit/ash_strings.h"
  32 #include "ui/base/l10n/l10n_util.h"
  33 #include "ui/gfx/display.h"
  34 #include "ui/gfx/display_observer.h"
  35 #include "ui/gfx/font_render_params.h"
  36 #include "ui/gfx/geometry/rect.h"
  37 #include "ui/gfx/geometry/size_conversions.h"
  38 #include "ui/gfx/screen.h"
  39
  40 #if defined(USE_X11)
  41 #include "ui/base/x/x11_util.h"
  42 #endif
  43
  44 #if defined(OS_CHROMEOS)
  45 #include "ash/display/display_configurator_animation.h"
  46 #include "base/sys_info.h"
  47 #endif
  48
  49 #if defined(OS_WIN)
  50 #include "base/win/windows_version.h"
  51 #endif
  52
  53 #include "base/debug/stack_trace.h"
  54
  55 namespace ash {
  56 typedef std::vector<gfx::Display> DisplayList;
  57 typedef std::vector<DisplayInfo> DisplayInfoList;
  58
  59 namespace {
  60
  61 // We need to keep this in order for unittests to tell if
  62 // the object in gfx::Screen::GetScreenByType is for shutdown.
  63 gfx::Screen* screen_for_shutdown = NULL;
  64
  65 // The number of pixels to overlap between the primary and secondary displays,
  66 // in case that the offset value is too large.
  67 const int kMinimumOverlapForInvalidOffset = 100;
  68
  69 struct DisplaySortFunctor {
  70   bool operator()(const gfx::Display& a, const gfx::Display& b) {
  71     return a.id() < b.id();
  72   }
  73 };
  74
  75 struct DisplayInfoSortFunctor {
  76   bool operator()(const DisplayInfo& a, const DisplayInfo& b) {
  77     return a.id() < b.id();
  78   }
  79 };
  80
  81 struct DisplayModeMatcher {
  82   DisplayModeMatcher(const DisplayMode& target_mode)
  83       : target_mode(target_mode) {}
  84   bool operator()(const DisplayMode& mode) {
  85     return target_mode.IsEquivalent(mode);
  86   }
  87   DisplayMode target_mode;
  88 };
  89
  90 gfx::Display& GetInvalidDisplay() {
  91   static gfx::Display* invalid_display = new gfx::Display();
  92   return *invalid_display;
  93 }
  94
  95 void SetInternalDisplayModeList(DisplayInfo* info) {
  96   DisplayMode native_mode;
  97   native_mode.size = info->bounds_in_native().size();
  98   native_mode.device_scale_factor = info->device_scale_factor();
  99   native_mode.ui_scale = 1.0f;
 100   info->SetDisplayModes(CreateInternalDisplayModeList(native_mode));
 101 }
 102
 103 void MaybeInitInternalDisplay(DisplayInfo* info) {
 104   int64 id = info->id();
 105   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
 106   if (command_line->HasSwitch(switches::kAshUseFirstDisplayAsInternal)) {
 107     gfx::Display::SetInternalDisplayId(id);
 108     SetInternalDisplayModeList(info);
 109   }
 110 }
 111
 112 bool IsInternalDisplayId(int64 id) {
 113   return gfx::Display::InternalDisplayId() == id;
 114 }
 115
 116 }  // namespace
 117
 118 using std::string;
 119 using std::vector;
 120
 121 // static
 122 int64 DisplayManager::kUnifiedDisplayId = -10;
 123
 124 DisplayManager::DisplayManager()
 125     : delegate_(NULL),
 126       screen_(new ScreenAsh),
 127       layout_store_(new DisplayLayoutStore),
 128       first_display_id_(gfx::Display::kInvalidDisplayID),
 129       num_connected_displays_(0),
 130       force_bounds_changed_(false),
 131       change_display_upon_host_resize_(false),
 132       multi_display_mode_(EXTENDED),
 133       default_multi_display_mode_(EXTENDED),
 134       mirroring_display_id_(gfx::Display::kInvalidDisplayID),
 135       registered_internal_display_rotation_lock_(false),
 136       registered_internal_display_rotation_(gfx::Display::ROTATE_0),
 137       weak_ptr_factory_(this) {
 138 #if defined(OS_CHROMEOS)
 139   // Enable only on the device so that DisplayManagerFontTest passes.
 140   if (base::SysInfo::IsRunningOnChromeOS())
 141     DisplayInfo::SetUse125DSFForUIScaling(true);
 142
 143   change_display_upon_host_resize_ = !base::SysInfo::IsRunningOnChromeOS();
 144 #endif
 145   gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_ALTERNATE, screen_.get());
 146   gfx::Screen* current_native =
 147       gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_NATIVE);
 148   // If there is no native, or the native was for shutdown,
 149   // use ash's screen.
 150   if (!current_native ||
 151       current_native == screen_for_shutdown) {
 152     gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE, screen_.get());
 153   }
 154 }
 155
 156 DisplayManager::~DisplayManager() {
 157 #if defined(OS_CHROMEOS)
 158   // Reset the font params.
 159   gfx::SetFontRenderParamsDeviceScaleFactor(1.0f);
 160 #endif
 161 }
 162
 163 bool DisplayManager::InitFromCommandLine() {
 164   DisplayInfoList info_list;
 165   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
 166   if (!command_line->HasSwitch(switches::kAshHostWindowBounds))
 167     return false;
 168   const string size_str =
 169       command_line->GetSwitchValueASCII(switches::kAshHostWindowBounds);
 170   vector<string> parts;
 171   base::SplitString(size_str, ',', &parts);
 172   for (vector<string>::const_iterator iter = parts.begin();
 173        iter != parts.end(); ++iter) {
 174     info_list.push_back(DisplayInfo::CreateFromSpec(*iter));
 175     info_list.back().set_native(true);
 176   }
 177   MaybeInitInternalDisplay(&info_list[0]);
 178   if (info_list.size() > 1 &&
 179       command_line->HasSwitch(switches::kAshEnableSoftwareMirroring)) {
 180     SetMultiDisplayMode(MIRRORING);
 181   }
 182   OnNativeDisplaysChanged(info_list);
 183   return true;
 184 }
 185
 186 void DisplayManager::InitDefaultDisplay() {
 187   DisplayInfoList info_list;
 188   info_list.push_back(DisplayInfo::CreateFromSpec(std::string()));
 189   info_list.back().set_native(true);
 190   MaybeInitInternalDisplay(&info_list[0]);
 191   OnNativeDisplaysChanged(info_list);
 192 }
 193
 194 void DisplayManager::RefreshFontParams() {
 195 #if defined(OS_CHROMEOS)
 196   // Use the largest device scale factor among currently active displays. Non
 197   // internal display may have bigger scale factor in case the external display
 198   // is an 4K display.
 199   float largest_device_scale_factor = 1.0f;
 200   for (const gfx::Display& display : active_display_list_) {
 201     const ash::DisplayInfo& info = display_info_[display.id()];
 202     largest_device_scale_factor = std::max(
 203         largest_device_scale_factor, info.GetEffectiveDeviceScaleFactor());
 204   }
 205   gfx::SetFontRenderParamsDeviceScaleFactor(largest_device_scale_factor);
 206 #endif  // OS_CHROMEOS
 207 }
 208
 209 DisplayLayout DisplayManager::GetCurrentDisplayLayout() {
 210   DCHECK_LE(2U, num_connected_displays());
 211   // Invert if the primary was swapped.
 212   if (num_connected_displays() == 2) {
 213     DisplayIdPair pair = GetCurrentDisplayIdPair();
 214     return layout_store_->ComputeDisplayLayoutForDisplayIdPair(pair);
 215   } else if (num_connected_displays() > 2) {
 216     // Return fixed horizontal layout for >= 3 displays.
 217     DisplayLayout layout(DisplayLayout::RIGHT, 0);
 218     return layout;
 219   }
 220   NOTREACHED() << "DisplayLayout is requested for single display";
 221   // On release build, just fallback to default instead of blowing up.
 222   DisplayLayout layout =
 223       layout_store_->default_display_layout();
 224   layout.primary_id = active_display_list_[0].id();
 225   return layout;
 226 }
 227
 228 DisplayIdPair DisplayManager::GetCurrentDisplayIdPair() const {
 229   if (IsInUnifiedMode()) {
 230     return std::make_pair(software_mirroring_display_list_[0].id(),
 231                           software_mirroring_display_list_[1].id());
 232   } else if (IsInMirrorMode()) {
 233     if (software_mirroring_enabled()) {
 234       CHECK_EQ(2u, num_connected_displays());
 235       // This comment is to make it easy to distinguish the crash
 236       // between two checks.
 237       CHECK_EQ(1u, active_display_list_.size());
 238     }
 239     return std::make_pair(active_display_list_[0].id(), mirroring_display_id_);
 240   } else {
 241     CHECK_LE(2u, active_display_list_.size());
 242     int64 id_at_zero = active_display_list_[0].id();
 243     if (id_at_zero == gfx::Display::InternalDisplayId() ||
 244         id_at_zero == first_display_id()) {
 245       return std::make_pair(id_at_zero, active_display_list_[1].id());
 246     } else {
 247       return std::make_pair(active_display_list_[1].id(), id_at_zero);
 248     }
 249   }
 250 }
 251
 252 void DisplayManager::SetLayoutForCurrentDisplays(
 253     const DisplayLayout& layout_relative_to_primary) {
 254   if (GetNumDisplays() != 2)
 255     return;
 256   const gfx::Display& primary = screen_->GetPrimaryDisplay();
 257   const DisplayIdPair pair = GetCurrentDisplayIdPair();
 258   // Invert if the primary was swapped.
 259   DisplayLayout to_set = pair.first == primary.id() ?
 260       layout_relative_to_primary : layout_relative_to_primary.Invert();
 261
 262   DisplayLayout current_layout =
 263       layout_store_->GetRegisteredDisplayLayout(pair);
 264   if (to_set.position != current_layout.position ||
 265       to_set.offset != current_layout.offset) {
 266     to_set.primary_id = primary.id();
 267     layout_store_->RegisterLayoutForDisplayIdPair(
 268         pair.first, pair.second, to_set);
 269     if (delegate_)
 270       delegate_->PreDisplayConfigurationChange(false);
 271     // PreDisplayConfigurationChange(false);
 272     // TODO(oshima): Call UpdateDisplays instead.
 273     const DisplayLayout layout = GetCurrentDisplayLayout();
 274     UpdateDisplayBoundsForLayout(
 275         layout, primary,
 276         FindDisplayForId(ScreenUtil::GetSecondaryDisplay().id()));
 277
 278     // Primary's bounds stay the same. Just notify bounds change
 279     // on the secondary.
 280     screen_->NotifyMetricsChanged(
 281         ScreenUtil::GetSecondaryDisplay(),
 282         gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS |
 283             gfx::DisplayObserver::DISPLAY_METRIC_WORK_AREA);
 284     if (delegate_)
 285       delegate_->PostDisplayConfigurationChange();
 286   }
 287 }
 288
 289 const gfx::Display& DisplayManager::GetDisplayForId(int64 id) const {
 290   gfx::Display* display =
 291       const_cast<DisplayManager*>(this)->FindDisplayForId(id);
 292   return display ? *display : GetInvalidDisplay();
 293 }
 294
 295 const gfx::Display& DisplayManager::FindDisplayContainingPoint(
 296     const gfx::Point& point_in_screen) const {
 297   int index =
 298       FindDisplayIndexContainingPoint(active_display_list_, point_in_screen);
 299   return index < 0 ? GetInvalidDisplay() : active_display_list_[index];
 300 }
 301
 302 bool DisplayManager::UpdateWorkAreaOfDisplay(int64 display_id,
 303                                              const gfx::Insets& insets) {
 304   gfx::Display* display = FindDisplayForId(display_id);
 305   DCHECK(display);
 306   gfx::Rect old_work_area = display->work_area();
 307   display->UpdateWorkAreaFromInsets(insets);
 308   return old_work_area != display->work_area();
 309 }
 310
 311 void DisplayManager::SetOverscanInsets(int64 display_id,
 312                                        const gfx::Insets& insets_in_dip) {
 313   bool update = false;
 314   DisplayInfoList display_info_list;
 315   for (const auto& display : active_display_list_) {
 316     DisplayInfo info = GetDisplayInfo(display.id());
 317     if (info.id() == display_id) {
 318       if (insets_in_dip.empty()) {
 319         info.set_clear_overscan_insets(true);
 320       } else {
 321         info.set_clear_overscan_insets(false);
 322         info.SetOverscanInsets(insets_in_dip);
 323       }
 324       update = true;
 325     }
 326     display_info_list.push_back(info);
 327   }
 328   if (update) {
 329     AddMirrorDisplayInfoIfAny(&display_info_list);
 330     UpdateDisplays(display_info_list);
 331   } else {
 332     display_info_[display_id].SetOverscanInsets(insets_in_dip);
 333   }
 334 }
 335
 336 void DisplayManager::SetDisplayRotation(int64 display_id,
 337                                         gfx::Display::Rotation rotation,
 338                                         gfx::Display::RotationSource source) {
 339   DisplayInfoList display_info_list;
 340   bool is_active = false;
 341   for (const auto& display : active_display_list_) {
 342     DisplayInfo info = GetDisplayInfo(display.id());
 343     if (info.id() == display_id) {
 344       if (info.GetRotation(source) == rotation &&
 345           info.GetActiveRotation() == rotation) {
 346         return;
 347       }
 348       info.SetRotation(rotation, source);
 349       is_active = true;
 350     }
 351     display_info_list.push_back(info);
 352   }
 353   if (is_active) {
 354     AddMirrorDisplayInfoIfAny(&display_info_list);
 355     UpdateDisplays(display_info_list);
 356   } else if (display_info_.find(display_id) != display_info_.end()) {
 357     // Inactive displays can reactivate, ensure they have been updated.
 358     display_info_[display_id].SetRotation(rotation, source);
 359   }
 360 }
 361
 362 bool DisplayManager::SetDisplayUIScale(int64 display_id,
 363                                        float ui_scale) {
 364   if (!IsDisplayUIScalingEnabled() ||
 365       gfx::Display::InternalDisplayId() != display_id) {
 366     return false;
 367   }
 368   bool found = false;
 369   // TODO(mukai): merge this implementation into SetDisplayMode().
 370   DisplayInfoList display_info_list;
 371   for (const auto& display : active_display_list_) {
 372     DisplayInfo info = GetDisplayInfo(display.id());
 373     if (info.id() == display_id) {
 374       found = true;
 375       if (info.configured_ui_scale() == ui_scale)
 376         return true;
 377       if (!HasDisplayModeForUIScale(info, ui_scale))
 378         return false;
 379       info.set_configured_ui_scale(ui_scale);
 380     }
 381     display_info_list.push_back(info);
 382   }
 383   if (found) {
 384     AddMirrorDisplayInfoIfAny(&display_info_list);
 385     UpdateDisplays(display_info_list);
 386     return true;
 387   }
 388   return false;
 389 }
 390
 391 void DisplayManager::SetDisplayResolution(int64 display_id,
 392                                           const gfx::Size& resolution) {
 393   DCHECK_NE(gfx::Display::InternalDisplayId(), display_id);
 394   if (gfx::Display::InternalDisplayId() == display_id)
 395     return;
 396   const DisplayInfo& display_info = GetDisplayInfo(display_id);
 397   const std::vector<DisplayMode>& modes = display_info.display_modes();
 398   DCHECK_NE(0u, modes.size());
 399   DisplayMode target_mode;
 400   target_mode.size = resolution;
 401   std::vector<DisplayMode>::const_iterator iter =
 402       std::find_if(modes.begin(), modes.end(), DisplayModeMatcher(target_mode));
 403   if (iter == modes.end()) {
 404     LOG(WARNING) << "Unsupported resolution was requested:"
 405                  << resolution.ToString();
 406     return;
 407   }
 408   display_modes_[display_id] = *iter;
 409 #if defined(OS_CHROMEOS)
 410   if (base::SysInfo::IsRunningOnChromeOS())
 411     Shell::GetInstance()->display_configurator()->OnConfigurationChanged();
 412 #endif
 413 }
 414
 415 bool DisplayManager::SetDisplayMode(int64 display_id,
 416                                     const DisplayMode& display_mode) {
 417   if (IsInternalDisplayId(display_id)) {
 418     SetDisplayUIScale(display_id, display_mode.ui_scale);
 419     return false;
 420   }
 421
 422   DisplayInfoList display_info_list;
 423   bool display_property_changed = false;
 424   bool resolution_changed = false;
 425   for (const auto& display : active_display_list_) {
 426     DisplayInfo info = GetDisplayInfo(display.id());
 427     if (info.id() == display_id) {
 428       const std::vector<DisplayMode>& modes = info.display_modes();
 429       std::vector<DisplayMode>::const_iterator iter =
 430           std::find_if(modes.begin(),
 431                        modes.end(),
 432                        DisplayModeMatcher(display_mode));
 433       if (iter == modes.end()) {
 434         LOG(WARNING) << "Unsupported resolution was requested:"
 435                      << display_mode.size.ToString();
 436         return false;
 437       }
 438       display_modes_[display_id] = *iter;
 439       if (info.bounds_in_native().size() != display_mode.size)
 440         resolution_changed = true;
 441       if (info.device_scale_factor() != display_mode.device_scale_factor) {
 442         info.set_device_scale_factor(display_mode.device_scale_factor);
 443         display_property_changed = true;
 444       }
 445     }
 446     display_info_list.push_back(info);
 447   }
 448   if (display_property_changed) {
 449     AddMirrorDisplayInfoIfAny(&display_info_list);
 450     UpdateDisplays(display_info_list);
 451   }
 452 #if defined(OS_CHROMEOS)
 453   if (resolution_changed && base::SysInfo::IsRunningOnChromeOS())
 454     Shell::GetInstance()->display_configurator()->OnConfigurationChanged();
 455 #endif
 456   return resolution_changed;
 457 }
 458
 459 void DisplayManager::RegisterDisplayProperty(
 460     int64 display_id,
 461     gfx::Display::Rotation rotation,
 462     float ui_scale,
 463     const gfx::Insets* overscan_insets,
 464     const gfx::Size& resolution_in_pixels,
 465     float device_scale_factor,
 466     ui::ColorCalibrationProfile color_profile) {
 467   if (display_info_.find(display_id) == display_info_.end())
 468     display_info_[display_id] = DisplayInfo(display_id, std::string(), false);
 469
 470   display_info_[display_id].SetRotation(rotation,
 471                                         gfx::Display::ROTATION_SOURCE_USER);
 472   display_info_[display_id].SetRotation(rotation,
 473                                         gfx::Display::ROTATION_SOURCE_ACTIVE);
 474   display_info_[display_id].SetColorProfile(color_profile);
 475   // Just in case the preference file was corrupted.
 476   // TODO(mukai): register |display_modes_| here as well, so the lookup for the
 477   // default mode in GetActiveModeForDisplayId() gets much simpler.
 478   if (0.5f <= ui_scale && ui_scale <= 2.0f)
 479     display_info_[display_id].set_configured_ui_scale(ui_scale);
 480   if (overscan_insets)
 481     display_info_[display_id].SetOverscanInsets(*overscan_insets);
 482   if (!resolution_in_pixels.IsEmpty()) {
 483     DCHECK(!IsInternalDisplayId(display_id));
 484     // Default refresh rate, until OnNativeDisplaysChanged() updates us with the
 485     // actual display info, is 60 Hz.
 486     DisplayMode mode(resolution_in_pixels, 60.0f, false, false);
 487     mode.device_scale_factor = device_scale_factor;
 488     display_modes_[display_id] = mode;
 489   }
 490 }
 491
 492 DisplayMode DisplayManager::GetActiveModeForDisplayId(int64 display_id) const {
 493   DisplayMode selected_mode;
 494   if (GetSelectedModeForDisplayId(display_id, &selected_mode))
 495     return selected_mode;
 496
 497   // If 'selected' mode is empty, it should return the default mode. This means
 498   // the native mode for the external display. Unfortunately this is not true
 499   // for the internal display because restoring UI-scale doesn't register the
 500   // restored mode to |display_mode_|, so it needs to look up the mode whose
 501   // UI-scale value matches. See the TODO in RegisterDisplayProperty().
 502   const DisplayInfo& info = GetDisplayInfo(display_id);
 503   const std::vector<DisplayMode>& display_modes = info.display_modes();
 504
 505   if (IsInternalDisplayId(display_id)) {
 506     for (size_t i = 0; i < display_modes.size(); ++i) {
 507       if (info.configured_ui_scale() == display_modes[i].ui_scale)
 508         return display_modes[i];
 509     }
 510   } else {
 511     for (size_t i = 0; i < display_modes.size(); ++i) {
 512       if (display_modes[i].native)
 513         return display_modes[i];
 514     }
 515   }
 516   return selected_mode;
 517 }
 518
 519 void DisplayManager::RegisterDisplayRotationProperties(bool rotation_lock,
 520     gfx::Display::Rotation rotation) {
 521   if (delegate_)
 522     delegate_->PreDisplayConfigurationChange(false);
 523   registered_internal_display_rotation_lock_ = rotation_lock;
 524   registered_internal_display_rotation_ = rotation;
 525   if (delegate_)
 526     delegate_->PostDisplayConfigurationChange();
 527 }
 528
 529 bool DisplayManager::GetSelectedModeForDisplayId(int64 id,
 530                                                  DisplayMode* mode_out) const {
 531   std::map<int64, DisplayMode>::const_iterator iter = display_modes_.find(id);
 532   if (iter == display_modes_.end())
 533     return false;
 534   *mode_out = iter->second;
 535   return true;
 536 }
 537
 538 bool DisplayManager::IsDisplayUIScalingEnabled() const {
 539   return GetDisplayIdForUIScaling() != gfx::Display::kInvalidDisplayID;
 540 }
 541
 542 gfx::Insets DisplayManager::GetOverscanInsets(int64 display_id) const {
 543   std::map<int64, DisplayInfo>::const_iterator it =
 544       display_info_.find(display_id);
 545   return (it != display_info_.end()) ?
 546       it->second.overscan_insets_in_dip() : gfx::Insets();
 547 }
 548
 549 void DisplayManager::SetColorCalibrationProfile(
 550     int64 display_id,
 551     ui::ColorCalibrationProfile profile) {
 552 #if defined(OS_CHROMEOS)
 553   if (!display_info_[display_id].IsColorProfileAvailable(profile))
 554     return;
 555
 556   if (delegate_)
 557     delegate_->PreDisplayConfigurationChange(false);
 558   // Just sets color profile if it's not running on ChromeOS (like tests).
 559   if (!base::SysInfo::IsRunningOnChromeOS() ||
 560       Shell::GetInstance()->display_configurator()->SetColorCalibrationProfile(
 561           display_id, profile)) {
 562     display_info_[display_id].SetColorProfile(profile);
 563     UMA_HISTOGRAM_ENUMERATION(
 564         "ChromeOS.Display.ColorProfile", profile, ui::NUM_COLOR_PROFILES);
 565   }
 566   if (delegate_)
 567     delegate_->PostDisplayConfigurationChange();
 568 #endif
 569 }
 570
 571 void DisplayManager::OnNativeDisplaysChanged(
 572     const std::vector<DisplayInfo>& updated_displays) {
 573   if (updated_displays.empty()) {
 574     VLOG(1) << "OnNativeDisplaysChanged(0): # of current displays="
 575             << active_display_list_.size();
 576     // If the device is booted without display, or chrome is started
 577     // without --ash-host-window-bounds on linux desktop, use the
 578     // default display.
 579     if (active_display_list_.empty()) {
 580       std::vector<DisplayInfo> init_displays;
 581       init_displays.push_back(DisplayInfo::CreateFromSpec(std::string()));
 582       MaybeInitInternalDisplay(&init_displays[0]);
 583       OnNativeDisplaysChanged(init_displays);
 584     } else {
 585       // Otherwise don't update the displays when all displays are disconnected.
 586       // This happens when:
 587       // - the device is idle and powerd requested to turn off all displays.
 588       // - the device is suspended. (kernel turns off all displays)
 589       // - the internal display's brightness is set to 0 and no external
 590       //   display is connected.
 591       // - the internal display's brightness is 0 and external display is
 592       //   disconnected.
 593       // The display will be updated when one of displays is turned on, and the
 594       // display list will be updated correctly.
 595     }
 596     return;
 597   }
 598   first_display_id_ = updated_displays[0].id();
 599   std::set<gfx::Point> origins;
 600
 601   if (updated_displays.size() == 1) {
 602     VLOG(1) << "OnNativeDisplaysChanged(1):" << updated_displays[0].ToString();
 603   } else {
 604     VLOG(1) << "OnNativeDisplaysChanged(" << updated_displays.size()
 605             << ") [0]=" << updated_displays[0].ToString()
 606             << ", [1]=" << updated_displays[1].ToString();
 607   }
 608
 609   bool internal_display_connected = false;
 610   num_connected_displays_ = updated_displays.size();
 611   mirroring_display_id_ = gfx::Display::kInvalidDisplayID;
 612   software_mirroring_display_list_.clear();
 613   DisplayInfoList new_display_info_list;
 614   for (DisplayInfoList::const_iterator iter = updated_displays.begin();
 615        iter != updated_displays.end();
 616        ++iter) {
 617     if (!internal_display_connected)
 618       internal_display_connected = IsInternalDisplayId(iter->id());
 619     // Mirrored monitors have the same origins.
 620     gfx::Point origin = iter->bounds_in_native().origin();
 621     if (origins.find(origin) != origins.end()) {
 622       InsertAndUpdateDisplayInfo(*iter);
 623       mirroring_display_id_ = iter->id();
 624     } else {
 625       origins.insert(origin);
 626       new_display_info_list.push_back(*iter);
 627     }
 628
 629     DisplayMode new_mode;
 630     new_mode.size = iter->bounds_in_native().size();
 631     new_mode.device_scale_factor = iter->device_scale_factor();
 632     new_mode.ui_scale = iter->configured_ui_scale();
 633     const std::vector<DisplayMode>& display_modes = iter->display_modes();
 634     // This is empty the displays are initialized from InitFromCommandLine.
 635     if (!display_modes.size())
 636       continue;
 637     std::vector<DisplayMode>::const_iterator display_modes_iter =
 638         std::find_if(display_modes.begin(),
 639                      display_modes.end(),
 640                      DisplayModeMatcher(new_mode));
 641     // Update the actual resolution selected as the resolution request may fail.
 642     if (display_modes_iter == display_modes.end())
 643       display_modes_.erase(iter->id());
 644     else if (display_modes_.find(iter->id()) != display_modes_.end())
 645       display_modes_[iter->id()] = *display_modes_iter;
 646   }
 647   if (gfx::Display::HasInternalDisplay() && !internal_display_connected) {
 648     if (display_info_.find(gfx::Display::InternalDisplayId()) ==
 649         display_info_.end()) {
 650       // Create a dummy internal display if the chrome restarted
 651       // in docked mode.
 652       DisplayInfo internal_display_info(
 653           gfx::Display::InternalDisplayId(),
 654           l10n_util::GetStringUTF8(IDS_ASH_INTERNAL_DISPLAY_NAME),
 655           false /*Internal display must not have overscan */);
 656       internal_display_info.SetBounds(gfx::Rect(0, 0, 800, 600));
 657       display_info_[gfx::Display::InternalDisplayId()] = internal_display_info;
 658     } else {
 659       // Internal display is no longer active. Reset its rotation to user
 660       // preference, so that it is restored when the internal display becomes
 661       // active again.
 662       gfx::Display::Rotation user_rotation =
 663           display_info_[gfx::Display::InternalDisplayId()].GetRotation(
 664               gfx::Display::ROTATION_SOURCE_USER);
 665       display_info_[gfx::Display::InternalDisplayId()].SetRotation(
 666           user_rotation, gfx::Display::ROTATION_SOURCE_USER);
 667     }
 668   }
 669
 670 #if defined(OS_CHROMEOS)
 671   if (new_display_info_list.size() > 1) {
 672     std::sort(new_display_info_list.begin(), new_display_info_list.end(),
 673               DisplayInfoSortFunctor());
 674     DisplayIdPair pair = std::make_pair(new_display_info_list[0].id(),
 675                                         new_display_info_list[1].id());
 676     DisplayLayout layout = layout_store_->GetRegisteredDisplayLayout(pair);
 677     default_multi_display_mode_ =
 678         (layout.default_unified && switches::UnifiedDesktopEnabled())
 679             ? UNIFIED
 680             : EXTENDED;
 681     // Mirror mode is set by DisplayConfigurator on the device.
 682     // Emulate it when running on linux desktop.
 683     if (!base::SysInfo::IsRunningOnChromeOS() && layout.mirrored)
 684       SetMultiDisplayMode(MIRRORING);
 685   }
 686 #endif
 687
 688   UpdateDisplays(new_display_info_list);
 689 }
 690
 691 void DisplayManager::UpdateDisplays() {
 692   DisplayInfoList display_info_list;
 693   for (const auto& display : active_display_list_)
 694     display_info_list.push_back(GetDisplayInfo(display.id()));
 695   AddMirrorDisplayInfoIfAny(&display_info_list);
 696   UpdateDisplays(display_info_list);
 697 }
 698
 699 void DisplayManager::UpdateDisplays(
 700     const std::vector<DisplayInfo>& updated_display_info_list) {
 701 #if defined(OS_WIN)
 702   DCHECK_EQ(1u, updated_display_info_list.size()) <<
 703       ": Multiple display test does not work on Windows bots. Please "
 704       "skip (don't disable) the test using SupportsMultipleDisplays()";
 705 #endif
 706
 707   DisplayInfoList new_display_info_list = updated_display_info_list;
 708   std::sort(active_display_list_.begin(), active_display_list_.end(),
 709             DisplaySortFunctor());
 710   std::sort(new_display_info_list.begin(),
 711             new_display_info_list.end(),
 712             DisplayInfoSortFunctor());
 713
 714   if (multi_display_mode_ != MIRRORING)
 715     multi_display_mode_ = default_multi_display_mode_;
 716
 717   CreateSoftwareMirroringDisplayInfo(&new_display_info_list);
 718
 719   // Close the mirroring window if any here to avoid creating two compositor on
 720   // one display.
 721   if (delegate_)
 722     delegate_->CloseMirroringDisplayIfNotNecessary();
 723
 724   DisplayList new_displays;
 725   DisplayList removed_displays;
 726   std::map<size_t, uint32_t> display_changes;
 727   std::vector<size_t> added_display_indices;
 728
 729   DisplayList::iterator curr_iter = active_display_list_.begin();
 730   DisplayInfoList::const_iterator new_info_iter = new_display_info_list.begin();
 731
 732   while (curr_iter != active_display_list_.end() ||
 733          new_info_iter != new_display_info_list.end()) {
 734     if (curr_iter == active_display_list_.end()) {
 735       // more displays in new list.
 736       added_display_indices.push_back(new_displays.size());
 737       InsertAndUpdateDisplayInfo(*new_info_iter);
 738       new_displays.push_back(
 739           CreateDisplayFromDisplayInfoById(new_info_iter->id()));
 740       ++new_info_iter;
 741     } else if (new_info_iter == new_display_info_list.end()) {
 742       // more displays in current list.
 743       removed_displays.push_back(*curr_iter);
 744       ++curr_iter;
 745     } else if (curr_iter->id() == new_info_iter->id()) {
 746       const gfx::Display& current_display = *curr_iter;
 747       // Copy the info because |CreateDisplayFromInfo| updates the instance.
 748       const DisplayInfo current_display_info =
 749           GetDisplayInfo(current_display.id());
 750       InsertAndUpdateDisplayInfo(*new_info_iter);
 751       gfx::Display new_display =
 752           CreateDisplayFromDisplayInfoById(new_info_iter->id());
 753       const DisplayInfo& new_display_info = GetDisplayInfo(new_display.id());
 754
 755       uint32_t metrics = gfx::DisplayObserver::DISPLAY_METRIC_NONE;
 756
 757       // At that point the new Display objects we have are not entirely updated,
 758       // they are missing the translation related to the Display disposition in
 759       // the layout.
 760       // Using display.bounds() and display.work_area() would fail most of the
 761       // time.
 762       if (force_bounds_changed_ ||
 763           (current_display_info.bounds_in_native() !=
 764            new_display_info.bounds_in_native()) ||
 765           (current_display_info.GetOverscanInsetsInPixel() !=
 766            new_display_info.GetOverscanInsetsInPixel()) ||
 767           current_display.size() != new_display.size()) {
 768         metrics |= gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS |
 769             gfx::DisplayObserver::DISPLAY_METRIC_WORK_AREA;
 770       }
 771
 772       if (current_display.device_scale_factor() !=
 773           new_display.device_scale_factor()) {
 774         metrics |= gfx::DisplayObserver::DISPLAY_METRIC_DEVICE_SCALE_FACTOR;
 775       }
 776
 777       if (current_display.rotation() != new_display.rotation())
 778         metrics |= gfx::DisplayObserver::DISPLAY_METRIC_ROTATION;
 779
 780       if (metrics != gfx::DisplayObserver::DISPLAY_METRIC_NONE) {
 781         display_changes.insert(
 782             std::pair<size_t, uint32_t>(new_displays.size(), metrics));
 783       }
 784
 785       new_display.UpdateWorkAreaFromInsets(current_display.GetWorkAreaInsets());
 786       new_displays.push_back(new_display);
 787       ++curr_iter;
 788       ++new_info_iter;
 789     } else if (curr_iter->id() < new_info_iter->id()) {
 790       // more displays in current list between ids, which means it is deleted.
 791       removed_displays.push_back(*curr_iter);
 792       ++curr_iter;
 793     } else {
 794       // more displays in new list between ids, which means it is added.
 795       added_display_indices.push_back(new_displays.size());
 796       InsertAndUpdateDisplayInfo(*new_info_iter);
 797       new_displays.push_back(
 798           CreateDisplayFromDisplayInfoById(new_info_iter->id()));
 799       ++new_info_iter;
 800     }
 801   }
 802   gfx::Display old_primary;
 803   if (delegate_)
 804     old_primary = screen_->GetPrimaryDisplay();
 805
 806   // Clear focus if the display has been removed, but don't clear focus if
 807   // the destkop has been moved from one display to another
 808   // (mirror -> docked, docked -> single internal).
 809   bool clear_focus =
 810       !removed_displays.empty() &&
 811       !(removed_displays.size() == 1 && added_display_indices.size() == 1);
 812   if (delegate_)
 813     delegate_->PreDisplayConfigurationChange(clear_focus);
 814
 815   std::vector<size_t> updated_indices;
 816   if (UpdateNonPrimaryDisplayBoundsForLayout(&new_displays, &updated_indices)) {
 817     for (std::vector<size_t>::iterator it = updated_indices.begin();
 818          it != updated_indices.end(); ++it) {
 819       size_t updated_index = *it;
 820       if (std::find(added_display_indices.begin(),
 821                     added_display_indices.end(),
 822                     updated_index) == added_display_indices.end()) {
 823         uint32_t metrics = gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS |
 824                            gfx::DisplayObserver::DISPLAY_METRIC_WORK_AREA;
 825         if (display_changes.find(updated_index) != display_changes.end())
 826           metrics |= display_changes[updated_index];
 827
 828         display_changes[updated_index] = metrics;
 829       }
 830     }
 831   }
 832
 833   active_display_list_ = new_displays;
 834
 835   RefreshFontParams();
 836   base::AutoReset<bool> resetter(&change_display_upon_host_resize_, false);
 837
 838   int active_display_list_size = active_display_list_.size();
 839   // Temporarily add displays to be removed because display object
 840   // being removed are accessed during shutting down the root.
 841   active_display_list_.insert(active_display_list_.end(),
 842                               removed_displays.begin(), removed_displays.end());
 843
 844   for (const auto& display : removed_displays)
 845     screen_->NotifyDisplayRemoved(display);
 846
 847   for (size_t index : added_display_indices)
 848     screen_->NotifyDisplayAdded(active_display_list_[index]);
 849
 850   active_display_list_.resize(active_display_list_size);
 851
 852   bool notify_primary_change =
 853       delegate_ ? old_primary.id() != screen_->GetPrimaryDisplay().id() : false;
 854
 855   for (std::map<size_t, uint32_t>::iterator iter = display_changes.begin();
 856        iter != display_changes.end();
 857        ++iter) {
 858     uint32_t metrics = iter->second;
 859     const gfx::Display& updated_display = active_display_list_[iter->first];
 860
 861     if (notify_primary_change &&
 862         updated_display.id() == screen_->GetPrimaryDisplay().id()) {
 863       metrics |= gfx::DisplayObserver::DISPLAY_METRIC_PRIMARY;
 864       notify_primary_change = false;
 865     }
 866     screen_->NotifyMetricsChanged(updated_display, metrics);
 867   }
 868
 869   if (notify_primary_change) {
 870     // This happens when a primary display has moved to anther display without
 871     // bounds change.
 872     const gfx::Display& primary = screen_->GetPrimaryDisplay();
 873     if (primary.id() != old_primary.id()) {
 874       uint32_t metrics = gfx::DisplayObserver::DISPLAY_METRIC_PRIMARY;
 875       if (primary.size() != old_primary.size()) {
 876         metrics |= (gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS |
 877                     gfx::DisplayObserver::DISPLAY_METRIC_WORK_AREA);
 878       }
 879       if (primary.device_scale_factor() != old_primary.device_scale_factor())
 880         metrics |= gfx::DisplayObserver::DISPLAY_METRIC_DEVICE_SCALE_FACTOR;
 881
 882       screen_->NotifyMetricsChanged(primary, metrics);
 883     }
 884   }
 885
 886   if (delegate_)
 887     delegate_->PostDisplayConfigurationChange();
 888
 889 #if defined(USE_X11) && defined(OS_CHROMEOS)
 890   if (!display_changes.empty() && base::SysInfo::IsRunningOnChromeOS())
 891     ui::ClearX11DefaultRootWindow();
 892 #endif
 893
 894   // Create the mirroring window asynchronously after all displays
 895   // are added so that it can mirror the display newly added. This can
 896   // happen when switching from dock mode to software mirror mode.
 897   CreateMirrorWindowAsyncIfAny();
 898 }
 899
 900 const gfx::Display& DisplayManager::GetDisplayAt(size_t index) const {
 901   DCHECK_LT(index, active_display_list_.size());
 902   return active_display_list_[index];
 903 }
 904
 905 const gfx::Display& DisplayManager::GetPrimaryDisplayCandidate() const {
 906   if (GetNumDisplays() != 2)
 907     return active_display_list_[0];
 908   DisplayLayout layout = layout_store_->GetRegisteredDisplayLayout(
 909       GetCurrentDisplayIdPair());
 910   return GetDisplayForId(layout.primary_id);
 911 }
 912
 913 size_t DisplayManager::GetNumDisplays() const {
 914   return active_display_list_.size();
 915 }
 916
 917 bool DisplayManager::IsInMirrorMode() const {
 918   return mirroring_display_id_ != gfx::Display::kInvalidDisplayID;
 919 }
 920
 921 bool DisplayManager::IsInUnifiedMode() const {
 922   return multi_display_mode_ == UNIFIED &&
 923          !software_mirroring_display_list_.empty();
 924 }
 925
 926 const DisplayInfo& DisplayManager::GetDisplayInfo(int64 display_id) const {
 927   DCHECK_NE(gfx::Display::kInvalidDisplayID, display_id);
 928
 929   std::map<int64, DisplayInfo>::const_iterator iter =
 930       display_info_.find(display_id);
 931   CHECK(iter != display_info_.end()) << display_id;
 932   return iter->second;
 933 }
 934
 935 const gfx::Display DisplayManager::GetMirroringDisplayById(
 936     int64 display_id) const {
 937   auto iter = std::find_if(software_mirroring_display_list_.begin(),
 938                            software_mirroring_display_list_.end(),
 939                            [display_id](const gfx::Display& display) {
 940                              return display.id() == display_id;
 941                            });
 942   return iter == software_mirroring_display_list_.end() ? gfx::Display()
 943                                                         : *iter;
 944 }
 945
 946 std::string DisplayManager::GetDisplayNameForId(int64 id) {
 947   if (id == gfx::Display::kInvalidDisplayID)
 948     return l10n_util::GetStringUTF8(IDS_ASH_STATUS_TRAY_UNKNOWN_DISPLAY_NAME);
 949
 950   std::map<int64, DisplayInfo>::const_iterator iter = display_info_.find(id);
 951   if (iter != display_info_.end() && !iter->second.name().empty())
 952     return iter->second.name();
 953
 954   return base::StringPrintf("Display %d", static_cast<int>(id));
 955 }
 956
 957 int64 DisplayManager::GetDisplayIdForUIScaling() const {
 958   // UI Scaling is effective only on internal display.
 959   int64 display_id = gfx::Display::InternalDisplayId();
 960 #if defined(OS_WIN)
 961   display_id = first_display_id();
 962 #endif
 963   return display_id;
 964 }
 965
 966 void DisplayManager::SetMirrorMode(bool mirror) {
 967 #if defined(OS_CHROMEOS)
 968   if (num_connected_displays() <= 1)
 969     return;
 970
 971   if (base::SysInfo::IsRunningOnChromeOS()) {
 972     ui::MultipleDisplayState new_state =
 973         mirror ? ui::MULTIPLE_DISPLAY_STATE_DUAL_MIRROR
 974                : ui::MULTIPLE_DISPLAY_STATE_DUAL_EXTENDED;
 975     Shell::GetInstance()->display_configurator()->SetDisplayMode(new_state);
 976     return;
 977   }
 978
 979   // This is fallback path to emulate mirroroing on desktop and unit test.
 980   DisplayInfoList display_info_list;
 981   for (DisplayList::const_iterator iter = active_display_list_.begin();
 982        (display_info_list.size() < 2 && iter != active_display_list_.end());
 983        ++iter) {
 984     if (iter->id() == kUnifiedDisplayId)
 985       continue;
 986     display_info_list.push_back(GetDisplayInfo(iter->id()));
 987   }
 988   for (auto iter = software_mirroring_display_list_.begin();
 989        (display_info_list.size() < 2 &&
 990         iter != software_mirroring_display_list_.end());
 991        ++iter) {
 992     display_info_list.push_back(GetDisplayInfo(iter->id()));
 993   }
 994   multi_display_mode_ = mirror ? MIRRORING : default_multi_display_mode_;
 995   ReconfigureDisplays();
 996   if (Shell::GetInstance()->display_configurator_animation()) {
 997     Shell::GetInstance()->display_configurator_animation()->
 998         StartFadeInAnimation();
 999   }
1000   RunPendingTasksForTest();
1001 #endif
1002 }
1003
1004 void DisplayManager::AddRemoveDisplay() {
1005   DCHECK(!active_display_list_.empty());
1006   std::vector<DisplayInfo> new_display_info_list;
1007   const DisplayInfo& first_display =
1008       IsInUnifiedMode()
1009           ? GetDisplayInfo(software_mirroring_display_list_[0].id())
1010           : GetDisplayInfo(active_display_list_[0].id());
1011   new_display_info_list.push_back(first_display);
1012   // Add if there is only one display connected.
1013   if (num_connected_displays() == 1) {
1014     const int kVerticalOffsetPx = 100;
1015     // Layout the 2nd display below the primary as with the real device.
1016     gfx::Rect host_bounds = first_display.bounds_in_native();
1017     new_display_info_list.push_back(
1018         DisplayInfo::CreateFromSpec(base::StringPrintf(
1019             "%d+%d-600x%d", host_bounds.x(),
1020             host_bounds.bottom() + kVerticalOffsetPx, host_bounds.height())));
1021   }
1022   num_connected_displays_ = new_display_info_list.size();
1023   mirroring_display_id_ = gfx::Display::kInvalidDisplayID;
1024   software_mirroring_display_list_.clear();
1025   UpdateDisplays(new_display_info_list);
1026 }
1027
1028 void DisplayManager::ToggleDisplayScaleFactor() {
1029   DCHECK(!active_display_list_.empty());
1030   std::vector<DisplayInfo> new_display_info_list;
1031   for (DisplayList::const_iterator iter = active_display_list_.begin();
1032        iter != active_display_list_.end(); ++iter) {
1033     DisplayInfo display_info = GetDisplayInfo(iter->id());
1034     display_info.set_device_scale_factor(
1035         display_info.device_scale_factor() == 1.0f ? 2.0f : 1.0f);
1036     new_display_info_list.push_back(display_info);
1037   }
1038   AddMirrorDisplayInfoIfAny(&new_display_info_list);
1039   UpdateDisplays(new_display_info_list);
1040 }
1041
1042 #if defined(OS_CHROMEOS)
1043 void DisplayManager::SetSoftwareMirroring(bool enabled) {
1044   SetMultiDisplayMode(enabled ? MIRRORING : default_multi_display_mode_);
1045 }
1046
1047 bool DisplayManager::SoftwareMirroringEnabled() const {
1048   return software_mirroring_enabled();
1049 }
1050 #endif
1051
1052 void DisplayManager::SetMultiDisplayMode(MultiDisplayMode mode) {
1053   multi_display_mode_ = mode;
1054   mirroring_display_id_ = gfx::Display::kInvalidDisplayID;
1055   software_mirroring_display_list_.clear();
1056 }
1057
1058 void DisplayManager::SetDefaultMultiDisplayMode(MultiDisplayMode mode) {
1059   DCHECK_NE(mode, MIRRORING);
1060   default_multi_display_mode_ = mode;
1061 }
1062
1063 void DisplayManager::ReconfigureDisplays() {
1064   DisplayInfoList display_info_list;
1065   for (DisplayList::const_iterator iter = active_display_list_.begin();
1066        (display_info_list.size() < 2 && iter != active_display_list_.end());
1067        ++iter) {
1068     if (iter->id() == kUnifiedDisplayId)
1069       continue;
1070     display_info_list.push_back(GetDisplayInfo(iter->id()));
1071   }
1072   for (auto iter = software_mirroring_display_list_.begin();
1073        (display_info_list.size() < 2 &&
1074         iter != software_mirroring_display_list_.end());
1075        ++iter) {
1076     display_info_list.push_back(GetDisplayInfo(iter->id()));
1077   }
1078   mirroring_display_id_ = gfx::Display::kInvalidDisplayID;
1079   software_mirroring_display_list_.clear();
1080   UpdateDisplays(display_info_list);
1081 }
1082
1083 bool DisplayManager::UpdateDisplayBounds(int64 display_id,
1084                                          const gfx::Rect& new_bounds) {
1085   if (change_display_upon_host_resize_) {
1086     display_info_[display_id].SetBounds(new_bounds);
1087     // Don't notify observers if the mirrored window has changed.
1088     if (software_mirroring_enabled() && mirroring_display_id_ == display_id)
1089       return false;
1090     gfx::Display* display = FindDisplayForId(display_id);
1091     display->SetSize(display_info_[display_id].size_in_pixel());
1092     screen_->NotifyMetricsChanged(*display,
1093                                   gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS);
1094     return true;
1095   }
1096   return false;
1097 }
1098
1099 void DisplayManager::CreateMirrorWindowAsyncIfAny() {
1100   // Do not post a task if the software mirroring doesn't exist, or
1101   // during initialization when compositor's init task isn't posted yet.
1102   // ash::Shell::Init() will call this after the compositor is initialized.
1103   if (software_mirroring_display_list_.empty() || !delegate_)
1104     return;
1105   base::MessageLoopForUI::current()->PostTask(
1106       FROM_HERE,
1107       base::Bind(&DisplayManager::CreateMirrorWindowIfAny,
1108                  weak_ptr_factory_.GetWeakPtr()));
1109 }
1110
1111 scoped_ptr<MouseWarpController> DisplayManager::CreateMouseWarpController(
1112     aura::Window* drag_source) const {
1113   if (IsInUnifiedMode() && num_connected_displays() >= 2)
1114     return make_scoped_ptr(new UnifiedMouseWarpController());
1115   // Extra check for |num_connected_displays()| is for SystemDisplayApiTest
1116   // that injects MockScreen.
1117   if (GetNumDisplays() < 2 || num_connected_displays() < 2)
1118     return make_scoped_ptr(new NullMouseWarpController());
1119   return make_scoped_ptr(new ExtendedMouseWarpController(drag_source));
1120 }
1121
1122 void DisplayManager::CreateScreenForShutdown() const {
1123   bool native_is_ash =
1124       gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_NATIVE) == screen_.get();
1125   delete screen_for_shutdown;
1126   screen_for_shutdown = screen_->CloneForShutdown();
1127   gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_ALTERNATE,
1128                                  screen_for_shutdown);
1129   if (native_is_ash) {
1130     gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE,
1131                                    screen_for_shutdown);
1132   }
1133 }
1134
1135 void DisplayManager::UpdateInternalDisplayModeListForTest() {
1136   if (display_info_.count(gfx::Display::InternalDisplayId()) == 0)
1137     return;
1138   DisplayInfo* info = &display_info_[gfx::Display::InternalDisplayId()];
1139   SetInternalDisplayModeList(info);
1140 }
1141
1142 void DisplayManager::CreateSoftwareMirroringDisplayInfo(
1143     DisplayInfoList* display_info_list) {
1144   // Use the internal display or 1st as the mirror source, then scale
1145   // the root window so that it matches the external display's
1146   // resolution. This is necessary in order for scaling to work while
1147   // mirrored.
1148   if (display_info_list->size() == 2) {
1149     switch (multi_display_mode_) {
1150       case MIRRORING: {
1151         bool zero_is_source =
1152             first_display_id_ == (*display_info_list)[0].id() ||
1153             gfx::Display::InternalDisplayId() == (*display_info_list)[0].id();
1154         DCHECK_EQ(MIRRORING, multi_display_mode_);
1155         mirroring_display_id_ =
1156             (*display_info_list)[zero_is_source ? 1 : 0].id();
1157
1158         int64 display_id = mirroring_display_id_;
1159         auto iter =
1160             std::find_if(display_info_list->begin(), display_info_list->end(),
1161                          [display_id](const DisplayInfo& info) {
1162                            return info.id() == display_id;
1163                          });
1164         DCHECK(iter != display_info_list->end());
1165
1166         DisplayInfo info = *iter;
1167         info.SetOverscanInsets(gfx::Insets());
1168         InsertAndUpdateDisplayInfo(info);
1169         software_mirroring_display_list_.push_back(
1170             CreateDisplayFromDisplayInfoById(mirroring_display_id_));
1171         display_info_list->erase(iter);
1172         break;
1173       }
1174       case UNIFIED: {
1175         // TODO(oshima): Suport displays that have different heights.
1176         // TODO(oshima): Currently, all displays are laid out horizontally,
1177         // from left to right. Allow more flexible layouts, such as
1178         // right to left, or vertical layouts.
1179         gfx::Rect unified_bounds;
1180         software_mirroring_display_list_.clear();
1181         for (auto& info : *display_info_list) {
1182           InsertAndUpdateDisplayInfo(info);
1183           gfx::Display display = CreateDisplayFromDisplayInfoById(info.id());
1184           gfx::Point origin(unified_bounds.right(), 0);
1185           display.set_bounds(gfx::Rect(origin, info.size_in_pixel()));
1186           display.UpdateWorkAreaFromInsets(gfx::Insets());
1187           unified_bounds.Union(display.bounds());
1188           software_mirroring_display_list_.push_back(display);
1189         }
1190         DisplayInfo info(kUnifiedDisplayId, "Unified Desktop", false);
1191         info.SetBounds(unified_bounds);
1192         display_info_list->clear();
1193         display_info_list->push_back(info);
1194         break;
1195       }
1196       case EXTENDED:
1197         break;
1198     }
1199   }
1200 }
1201
1202 gfx::Display* DisplayManager::FindDisplayForId(int64 id) {
1203   auto iter = std::find_if(
1204       active_display_list_.begin(), active_display_list_.end(),
1205       [id](const gfx::Display& display) { return display.id() == id; });
1206   if (iter != active_display_list_.end())
1207     return &(*iter);
1208   // TODO(oshima): This happens when a windows in unified desktop have
1209   // been moved to normal window. Fix this.
1210   if (id != kUnifiedDisplayId)
1211     DLOG(WARNING) << "Could not find display:" << id;
1212   return NULL;
1213 }
1214
1215 void DisplayManager::AddMirrorDisplayInfoIfAny(
1216     std::vector<DisplayInfo>* display_info_list) {
1217   if (software_mirroring_enabled() && IsInMirrorMode())
1218     display_info_list->push_back(GetDisplayInfo(mirroring_display_id_));
1219 }
1220
1221 void DisplayManager::InsertAndUpdateDisplayInfo(const DisplayInfo& new_info) {
1222   std::map<int64, DisplayInfo>::iterator info =
1223       display_info_.find(new_info.id());
1224   if (info != display_info_.end()) {
1225     info->second.Copy(new_info);
1226   } else {
1227     display_info_[new_info.id()] = new_info;
1228     display_info_[new_info.id()].set_native(false);
1229   }
1230   display_info_[new_info.id()].UpdateDisplaySize();
1231   OnDisplayInfoUpdated(display_info_[new_info.id()]);
1232 }
1233
1234 void DisplayManager::OnDisplayInfoUpdated(const DisplayInfo& display_info) {
1235 #if defined(OS_CHROMEOS)
1236   ui::ColorCalibrationProfile color_profile = display_info.color_profile();
1237   if (color_profile != ui::COLOR_PROFILE_STANDARD) {
1238     Shell::GetInstance()->display_configurator()->SetColorCalibrationProfile(
1239         display_info.id(), color_profile);
1240   }
1241 #endif
1242 }
1243
1244 gfx::Display DisplayManager::CreateDisplayFromDisplayInfoById(int64 id) {
1245   DCHECK(display_info_.find(id) != display_info_.end()) << "id=" << id;
1246   const DisplayInfo& display_info = display_info_[id];
1247
1248   gfx::Display new_display(display_info.id());
1249   gfx::Rect bounds_in_native(display_info.size_in_pixel());
1250   float device_scale_factor = display_info.GetEffectiveDeviceScaleFactor();
1251
1252   // Simply set the origin to (0,0).  The primary display's origin is
1253   // always (0,0) and the bounds of non-primary display(s) will be updated
1254   // in |UpdateNonPrimaryDisplayBoundsForLayout| called in |UpdateDisplay|.
1255   new_display.SetScaleAndBounds(
1256       device_scale_factor, gfx::Rect(bounds_in_native.size()));
1257   new_display.set_rotation(display_info.GetActiveRotation());
1258   new_display.set_touch_support(display_info.touch_support());
1259   return new_display;
1260 }
1261
1262 bool DisplayManager::UpdateNonPrimaryDisplayBoundsForLayout(
1263     DisplayList* displays,
1264     std::vector<size_t>* updated_indices) const {
1265
1266   if (displays->size() < 2U)
1267     return false;
1268
1269   if (displays->size() > 2U) {
1270     // For more than 2 displays, always use horizontal layout.
1271     int x_offset = displays->at(0).bounds().width();
1272     for (size_t i = 1; i < displays->size(); ++i) {
1273       gfx::Display& display = displays->at(i);
1274       const gfx::Rect& bounds = display.bounds();
1275       gfx::Point origin = gfx::Point(x_offset, 0);
1276       gfx::Insets insets = display.GetWorkAreaInsets();
1277       display.set_bounds(gfx::Rect(origin, bounds.size()));
1278       display.UpdateWorkAreaFromInsets(insets);
1279       x_offset += bounds.width();
1280       updated_indices->push_back(i);
1281     }
1282     return true;
1283   }
1284
1285   int64 id_at_zero = displays->at(0).id();
1286   DisplayIdPair pair =
1287       (id_at_zero == first_display_id_ ||
1288        id_at_zero == gfx::Display::InternalDisplayId()) ?
1289       std::make_pair(id_at_zero, displays->at(1).id()) :
1290       std::make_pair(displays->at(1).id(), id_at_zero);
1291   DisplayLayout layout =
1292       layout_store_->ComputeDisplayLayoutForDisplayIdPair(pair);
1293
1294   // Ignore if a user has a old format (should be extremely rare)
1295   // and this will be replaced with DCHECK.
1296   if (layout.primary_id != gfx::Display::kInvalidDisplayID) {
1297     size_t primary_index, secondary_index;
1298     if (displays->at(0).id() == layout.primary_id) {
1299       primary_index = 0;
1300       secondary_index = 1;
1301     } else {
1302       primary_index = 1;
1303       secondary_index = 0;
1304     }
1305     // This function may be called before the secondary display is
1306     // registered. The bounds is empty in that case and will
1307     // return true.
1308     gfx::Rect bounds =
1309         GetDisplayForId(displays->at(secondary_index).id()).bounds();
1310     UpdateDisplayBoundsForLayout(
1311         layout, displays->at(primary_index), &displays->at(secondary_index));
1312     updated_indices->push_back(secondary_index);
1313     return bounds != displays->at(secondary_index).bounds();
1314   }
1315   return false;
1316 }
1317
1318 void DisplayManager::CreateMirrorWindowIfAny() {
1319   if (software_mirroring_display_list_.empty() || !delegate_)
1320     return;
1321   DisplayInfoList list;
1322   for (auto& display : software_mirroring_display_list_)
1323     list.push_back(GetDisplayInfo(display.id()));
1324   delegate_->CreateOrUpdateMirroringDisplay(list);
1325 }
1326
1327 // static
1328 void DisplayManager::UpdateDisplayBoundsForLayout(
1329     const DisplayLayout& layout,
1330     const gfx::Display& primary_display,
1331     gfx::Display* secondary_display) {
1332   DCHECK_EQ("0,0", primary_display.bounds().origin().ToString());
1333
1334   const gfx::Rect& primary_bounds = primary_display.bounds();
1335   const gfx::Rect& secondary_bounds = secondary_display->bounds();
1336   gfx::Point new_secondary_origin = primary_bounds.origin();
1337
1338   DisplayLayout::Position position = layout.position;
1339
1340   // Ignore the offset in case the secondary display doesn't share edges with
1341   // the primary display.
1342   int offset = layout.offset;
1343   if (position == DisplayLayout::TOP || position == DisplayLayout::BOTTOM) {
1344     offset = std::min(
1345         offset, primary_bounds.width() - kMinimumOverlapForInvalidOffset);
1346     offset = std::max(
1347         offset, -secondary_bounds.width() + kMinimumOverlapForInvalidOffset);
1348   } else {
1349     offset = std::min(
1350         offset, primary_bounds.height() - kMinimumOverlapForInvalidOffset);
1351     offset = std::max(
1352         offset, -secondary_bounds.height() + kMinimumOverlapForInvalidOffset);
1353   }
1354   switch (position) {
1355     case DisplayLayout::TOP:
1356       new_secondary_origin.Offset(offset, -secondary_bounds.height());
1357       break;
1358     case DisplayLayout::RIGHT:
1359       new_secondary_origin.Offset(primary_bounds.width(), offset);
1360       break;
1361     case DisplayLayout::BOTTOM:
1362       new_secondary_origin.Offset(offset, primary_bounds.height());
1363       break;
1364     case DisplayLayout::LEFT:
1365       new_secondary_origin.Offset(-secondary_bounds.width(), offset);
1366       break;
1367   }
1368   gfx::Insets insets = secondary_display->GetWorkAreaInsets();
1369   secondary_display->set_bounds(
1370       gfx::Rect(new_secondary_origin, secondary_bounds.size()));
1371   secondary_display->UpdateWorkAreaFromInsets(insets);
1372 }
1373
1374 void DisplayManager::RunPendingTasksForTest() {
1375   if (!software_mirroring_display_list_.empty())
1376     base::RunLoop().RunUntilIdle();
1377 }
1378
1379 }  // namespace ash