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