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 }  // namespace
 113
 114 using std::string;
 115 using std::vector;
 116
 117 // static
 118 int64 DisplayManager::kUnifiedDisplayId = -10;
 119
 120 DisplayManager::DisplayManager()
 121     : delegate_(NULL),
 122       screen_(new ScreenAsh),
 123       layout_store_(new DisplayLayoutStore),
 124       first_display_id_(gfx::Display::kInvalidDisplayID),
 125       num_connected_displays_(0),
 126       force_bounds_changed_(false),
 127       change_display_upon_host_resize_(false),
 128       multi_display_mode_(EXTENDED),
 129       default_multi_display_mode_(EXTENDED),
 130       mirroring_display_id_(gfx::Display::kInvalidDisplayID),
 131       registered_internal_display_rotation_lock_(false),
 132       registered_internal_display_rotation_(gfx::Display::ROTATE_0),
 133       weak_ptr_factory_(this) {
 134 #if defined(OS_CHROMEOS)
 135   change_display_upon_host_resize_ = !base::SysInfo::IsRunningOnChromeOS();
 136 #endif
 137   gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_ALTERNATE, screen_.get());
 138   gfx::Screen* current_native =
 139       gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_NATIVE);
 140   // If there is no native, or the native was for shutdown,
 141   // use ash's screen.
 142   if (!current_native ||
 143       current_native == screen_for_shutdown) {
 144     gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE, screen_.get());
 145   }
 146 }
 147
 148 DisplayManager::~DisplayManager() {
 149 #if defined(OS_CHROMEOS)
 150   // Reset the font params.
 151   gfx::SetFontRenderParamsDeviceScaleFactor(1.0f);
 152 #endif
 153 }
 154
 155 bool DisplayManager::InitFromCommandLine() {
 156   DisplayInfoList info_list;
 157   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
 158   if (!command_line->HasSwitch(switches::kAshHostWindowBounds))
 159     return false;
 160   const string size_str =
 161       command_line->GetSwitchValueASCII(switches::kAshHostWindowBounds);
 162   vector<string> parts;
 163   base::SplitString(size_str, ',', &parts);
 164   for (vector<string>::const_iterator iter = parts.begin();
 165        iter != parts.end(); ++iter) {
 166     info_list.push_back(DisplayInfo::CreateFromSpec(*iter));
 167     info_list.back().set_native(true);
 168   }
 169   MaybeInitInternalDisplay(&info_list[0]);
 170   if (info_list.size() > 1 &&
 171       command_line->HasSwitch(switches::kAshEnableSoftwareMirroring)) {
 172     SetMultiDisplayMode(MIRRORING);
 173   }
 174   OnNativeDisplaysChanged(info_list);
 175   return true;
 176 }
 177
 178 void DisplayManager::InitDefaultDisplay() {
 179   DisplayInfoList info_list;
 180   info_list.push_back(DisplayInfo::CreateFromSpec(std::string()));
 181   info_list.back().set_native(true);
 182   MaybeInitInternalDisplay(&info_list[0]);
 183   OnNativeDisplaysChanged(info_list);
 184 }
 185
 186 void DisplayManager::RefreshFontParams() {
 187 #if defined(OS_CHROMEOS)
 188   // Use the largest device scale factor among currently active displays. Non
 189   // internal display may have bigger scale factor in case the external display
 190   // is an 4K display.
 191   float largest_device_scale_factor = 1.0f;
 192   for (const gfx::Display& display : active_display_list_) {
 193     const ash::DisplayInfo& info = display_info_[display.id()];
 194     largest_device_scale_factor = std::max(
 195         largest_device_scale_factor, info.GetEffectiveDeviceScaleFactor());
 196   }
 197   gfx::SetFontRenderParamsDeviceScaleFactor(largest_device_scale_factor);
 198 #endif  // OS_CHROMEOS
 199 }
 200
 201 DisplayLayout DisplayManager::GetCurrentDisplayLayout() {
 202   DCHECK_LE(2U, num_connected_displays());
 203   // Invert if the primary was swapped.
 204   if (num_connected_displays() == 2) {
 205     DisplayIdPair pair = GetCurrentDisplayIdPair();
 206     return layout_store_->ComputeDisplayLayoutForDisplayIdPair(pair);
 207   } else if (num_connected_displays() > 2) {
 208     // Return fixed horizontal layout for >= 3 displays.
 209     DisplayLayout layout(DisplayLayout::RIGHT, 0);
 210     return layout;
 211   }
 212   NOTREACHED() << "DisplayLayout is requested for single display";
 213   // On release build, just fallback to default instead of blowing up.
 214   DisplayLayout layout =
 215       layout_store_->default_display_layout();
 216   layout.primary_id = active_display_list_[0].id();
 217   return layout;
 218 }
 219
 220 DisplayIdPair DisplayManager::GetCurrentDisplayIdPair() const {
 221   if (IsInUnifiedMode()) {
 222     return std::make_pair(software_mirroring_display_list_[0].id(),
 223                           software_mirroring_display_list_[1].id());
 224   } else if (IsInMirrorMode()) {
 225     if (software_mirroring_enabled()) {
 226       CHECK_EQ(2u, num_connected_displays());
 227       // This comment is to make it easy to distinguish the crash
 228       // between two checks.
 229       CHECK_EQ(1u, active_display_list_.size());
 230     }
 231     return std::make_pair(active_display_list_[0].id(), mirroring_display_id_);
 232   } else {
 233     CHECK_LE(2u, active_display_list_.size());
 234     int64 id_at_zero = active_display_list_[0].id();
 235     if (gfx::Display::IsInternalDisplayId(id_at_zero) ||
 236         id_at_zero == first_display_id()) {
 237       return std::make_pair(id_at_zero, active_display_list_[1].id());
 238     } else {
 239       return std::make_pair(active_display_list_[1].id(), id_at_zero);
 240     }
 241   }
 242 }
 243
 244 void DisplayManager::SetLayoutForCurrentDisplays(
 245     const DisplayLayout& layout_relative_to_primary) {
 246   if (GetNumDisplays() != 2)
 247     return;
 248   const gfx::Display& primary = screen_->GetPrimaryDisplay();
 249   const DisplayIdPair pair = GetCurrentDisplayIdPair();
 250   // Invert if the primary was swapped.
 251   DisplayLayout to_set = pair.first == primary.id() ?
 252       layout_relative_to_primary : layout_relative_to_primary.Invert();
 253
 254   DisplayLayout current_layout =
 255       layout_store_->GetRegisteredDisplayLayout(pair);
 256   if (to_set.position != current_layout.position ||
 257       to_set.offset != current_layout.offset) {
 258     to_set.primary_id = primary.id();
 259     layout_store_->RegisterLayoutForDisplayIdPair(
 260         pair.first, pair.second, to_set);
 261     if (delegate_)
 262       delegate_->PreDisplayConfigurationChange(false);
 263     // PreDisplayConfigurationChange(false);
 264     // TODO(oshima): Call UpdateDisplays instead.
 265     const DisplayLayout layout = GetCurrentDisplayLayout();
 266     UpdateDisplayBoundsForLayout(
 267         layout, primary,
 268         FindDisplayForId(ScreenUtil::GetSecondaryDisplay().id()));
 269
 270     // Primary's bounds stay the same. Just notify bounds change
 271     // on the secondary.
 272     screen_->NotifyMetricsChanged(
 273         ScreenUtil::GetSecondaryDisplay(),
 274         gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS |
 275             gfx::DisplayObserver::DISPLAY_METRIC_WORK_AREA);
 276     if (delegate_)
 277       delegate_->PostDisplayConfigurationChange();
 278   }
 279 }
 280
 281 const gfx::Display& DisplayManager::GetDisplayForId(int64 id) const {
 282   gfx::Display* display =
 283       const_cast<DisplayManager*>(this)->FindDisplayForId(id);
 284   return display ? *display : GetInvalidDisplay();
 285 }
 286
 287 const gfx::Display& DisplayManager::FindDisplayContainingPoint(
 288     const gfx::Point& point_in_screen) const {
 289   int index =
 290       FindDisplayIndexContainingPoint(active_display_list_, point_in_screen);
 291   return index < 0 ? GetInvalidDisplay() : active_display_list_[index];
 292 }
 293
 294 bool DisplayManager::UpdateWorkAreaOfDisplay(int64 display_id,
 295                                              const gfx::Insets& insets) {
 296   gfx::Display* display = FindDisplayForId(display_id);
 297   DCHECK(display);
 298   gfx::Rect old_work_area = display->work_area();
 299   display->UpdateWorkAreaFromInsets(insets);
 300   return old_work_area != display->work_area();
 301 }
 302
 303 void DisplayManager::SetOverscanInsets(int64 display_id,
 304                                        const gfx::Insets& insets_in_dip) {
 305   bool update = false;
 306   DisplayInfoList display_info_list;
 307   for (const auto& display : active_display_list_) {
 308     DisplayInfo info = GetDisplayInfo(display.id());
 309     if (info.id() == display_id) {
 310       if (insets_in_dip.empty()) {
 311         info.set_clear_overscan_insets(true);
 312       } else {
 313         info.set_clear_overscan_insets(false);
 314         info.SetOverscanInsets(insets_in_dip);
 315       }
 316       update = true;
 317     }
 318     display_info_list.push_back(info);
 319   }
 320   if (update) {
 321     AddMirrorDisplayInfoIfAny(&display_info_list);
 322     UpdateDisplays(display_info_list);
 323   } else {
 324     display_info_[display_id].SetOverscanInsets(insets_in_dip);
 325   }
 326 }
 327
 328 void DisplayManager::SetDisplayRotation(int64 display_id,
 329                                         gfx::Display::Rotation rotation,
 330                                         gfx::Display::RotationSource source) {
 331   if (IsInUnifiedMode())
 332     return;
 333
 334   DisplayInfoList display_info_list;
 335   bool is_active = false;
 336   for (const auto& display : active_display_list_) {
 337     DisplayInfo info = GetDisplayInfo(display.id());
 338     if (info.id() == display_id) {
 339       if (info.GetRotation(source) == rotation &&
 340           info.GetActiveRotation() == rotation) {
 341         return;
 342       }
 343       info.SetRotation(rotation, source);
 344       is_active = true;
 345     }
 346     display_info_list.push_back(info);
 347   }
 348   if (is_active) {
 349     AddMirrorDisplayInfoIfAny(&display_info_list);
 350     UpdateDisplays(display_info_list);
 351   } else if (display_info_.find(display_id) != display_info_.end()) {
 352     // Inactive displays can reactivate, ensure they have been updated.
 353     display_info_[display_id].SetRotation(rotation, source);
 354   }
 355 }
 356
 357 bool DisplayManager::SetDisplayUIScale(int64 display_id,
 358                                        float ui_scale) {
 359   if (GetDisplayIdForUIScaling() != display_id)
 360     return false;
 361
 362   bool found = false;
 363   // TODO(mukai): merge this implementation into SetDisplayMode().
 364   DisplayInfoList display_info_list;
 365   for (const auto& display : active_display_list_) {
 366     DisplayInfo info = GetDisplayInfo(display.id());
 367     if (info.id() == display_id) {
 368       found = true;
 369       if (info.configured_ui_scale() == ui_scale)
 370         return true;
 371       if (!HasDisplayModeForUIScale(info, ui_scale))
 372         return false;
 373       info.set_configured_ui_scale(ui_scale);
 374     }
 375     display_info_list.push_back(info);
 376   }
 377   if (found) {
 378     AddMirrorDisplayInfoIfAny(&display_info_list);
 379     UpdateDisplays(display_info_list);
 380     return true;
 381   }
 382   return false;
 383 }
 384
 385 void DisplayManager::SetDisplayResolution(int64 display_id,
 386                                           const gfx::Size& resolution) {
 387   DCHECK(!gfx::Display::IsInternalDisplayId(display_id));
 388   if (gfx::Display::IsInternalDisplayId(display_id))
 389     return;
 390   const DisplayInfo& display_info = GetDisplayInfo(display_id);
 391   const std::vector<DisplayMode>& modes = display_info.display_modes();
 392   DCHECK_NE(0u, modes.size());
 393   DisplayMode target_mode;
 394   target_mode.size = resolution;
 395   std::vector<DisplayMode>::const_iterator iter =
 396       std::find_if(modes.begin(), modes.end(), DisplayModeMatcher(target_mode));
 397   if (iter == modes.end()) {
 398     LOG(WARNING) << "Unsupported resolution was requested:"
 399                  << resolution.ToString();
 400     return;
 401   }
 402   display_modes_[display_id] = *iter;
 403 #if defined(OS_CHROMEOS)
 404   if (base::SysInfo::IsRunningOnChromeOS())
 405     Shell::GetInstance()->display_configurator()->OnConfigurationChanged();
 406 #endif
 407 }
 408
 409 bool DisplayManager::SetDisplayMode(int64 display_id,
 410                                     const DisplayMode& display_mode) {
 411   if (GetDisplayIdForUIScaling() == display_id) {
 412     SetDisplayUIScale(display_id, display_mode.ui_scale);
 413     return false;
 414   }
 415
 416   DisplayInfoList display_info_list;
 417   bool display_property_changed = false;
 418   bool resolution_changed = false;
 419   for (const auto& display : active_display_list_) {
 420     DisplayInfo info = GetDisplayInfo(display.id());
 421     if (info.id() == display_id) {
 422       const std::vector<DisplayMode>& modes = info.display_modes();
 423       std::vector<DisplayMode>::const_iterator iter =
 424           std::find_if(modes.begin(),
 425                        modes.end(),
 426                        DisplayModeMatcher(display_mode));
 427       if (iter == modes.end()) {
 428         LOG(WARNING) << "Unsupported resolution was requested:"
 429                      << display_mode.size.ToString();
 430         return false;
 431       }
 432       display_modes_[display_id] = *iter;
 433       if (info.bounds_in_native().size() != display_mode.size)
 434         resolution_changed = true;
 435       if (info.device_scale_factor() != display_mode.device_scale_factor) {
 436         info.set_device_scale_factor(display_mode.device_scale_factor);
 437         display_property_changed = true;
 438       }
 439     }
 440     display_info_list.push_back(info);
 441   }
 442   if (display_property_changed) {
 443     AddMirrorDisplayInfoIfAny(&display_info_list);
 444     UpdateDisplays(display_info_list);
 445   }
 446 #if defined(OS_CHROMEOS)
 447   if (resolution_changed && base::SysInfo::IsRunningOnChromeOS())
 448     Shell::GetInstance()->display_configurator()->OnConfigurationChanged();
 449 #endif
 450   return resolution_changed;
 451 }
 452
 453 void DisplayManager::RegisterDisplayProperty(
 454     int64 display_id,
 455     gfx::Display::Rotation rotation,
 456     float ui_scale,
 457     const gfx::Insets* overscan_insets,
 458     const gfx::Size& resolution_in_pixels,
 459     float device_scale_factor,
 460     ui::ColorCalibrationProfile color_profile) {
 461   if (display_info_.find(display_id) == display_info_.end())
 462     display_info_[display_id] = DisplayInfo(display_id, std::string(), false);
 463
 464   // Do not allow rotation in unified desktop mode.
 465   if (display_id == kUnifiedDisplayId)
 466     rotation = gfx::Display::ROTATE_0;
 467
 468   display_info_[display_id].SetRotation(rotation,
 469                                         gfx::Display::ROTATION_SOURCE_USER);
 470   display_info_[display_id].SetRotation(rotation,
 471                                         gfx::Display::ROTATION_SOURCE_ACTIVE);
 472   display_info_[display_id].SetColorProfile(color_profile);
 473   // Just in case the preference file was corrupted.
 474   // TODO(mukai): register |display_modes_| here as well, so the lookup for the
 475   // default mode in GetActiveModeForDisplayId() gets much simpler.
 476   if (0.5f <= ui_scale && ui_scale <= 2.0f)
 477     display_info_[display_id].set_configured_ui_scale(ui_scale);
 478   if (overscan_insets)
 479     display_info_[display_id].SetOverscanInsets(*overscan_insets);
 480   if (!resolution_in_pixels.IsEmpty()) {
 481     DCHECK(!gfx::Display::IsInternalDisplayId(display_id));
 482     // Default refresh rate, until OnNativeDisplaysChanged() updates us with the
 483     // actual display info, is 60 Hz.
 484     DisplayMode mode(resolution_in_pixels, 60.0f, false, false);
 485     mode.device_scale_factor = device_scale_factor;
 486     display_modes_[display_id] = mode;
 487   }
 488 }
 489
 490 DisplayMode DisplayManager::GetActiveModeForDisplayId(int64 display_id) const {
 491   DisplayMode selected_mode;
 492   if (GetSelectedModeForDisplayId(display_id, &selected_mode))
 493     return selected_mode;
 494
 495   // If 'selected' mode is empty, it should return the default mode. This means
 496   // the native mode for the external display. Unfortunately this is not true
 497   // for the internal display because restoring UI-scale doesn't register the
 498   // restored mode to |display_mode_|, so it needs to look up the mode whose
 499   // UI-scale value matches. See the TODO in RegisterDisplayProperty().
 500   const DisplayInfo& info = GetDisplayInfo(display_id);
 501   const std::vector<DisplayMode>& display_modes = info.display_modes();
 502
 503   if (GetDisplayIdForUIScaling() == display_id) {
 504     for (size_t i = 0; i < display_modes.size(); ++i) {
 505       if (info.configured_ui_scale() == display_modes[i].ui_scale)
 506         return display_modes[i];
 507     }
 508   } else {
 509     for (size_t i = 0; i < display_modes.size(); ++i) {
 510       if (display_modes[i].native)
 511         return display_modes[i];
 512     }
 513   }
 514   return selected_mode;
 515 }
 516
 517 void DisplayManager::RegisterDisplayRotationProperties(bool rotation_lock,
 518     gfx::Display::Rotation rotation) {
 519   if (delegate_)
 520     delegate_->PreDisplayConfigurationChange(false);
 521   registered_internal_display_rotation_lock_ = rotation_lock;
 522   registered_internal_display_rotation_ = rotation;
 523   if (delegate_)
 524     delegate_->PostDisplayConfigurationChange();
 525 }
 526
 527 bool DisplayManager::GetSelectedModeForDisplayId(int64 id,
 528                                                  DisplayMode* mode_out) const {
 529   std::map<int64, DisplayMode>::const_iterator iter = display_modes_.find(id);
 530   if (iter == display_modes_.end())
 531     return false;
 532   *mode_out = iter->second;
 533   return true;
 534 }
 535
 536 bool DisplayManager::IsDisplayUIScalingEnabled() const {
 537   return GetDisplayIdForUIScaling() != gfx::Display::kInvalidDisplayID;
 538 }
 539
 540 gfx::Insets DisplayManager::GetOverscanInsets(int64 display_id) const {
 541   std::map<int64, DisplayInfo>::const_iterator it =
 542       display_info_.find(display_id);
 543   return (it != display_info_.end()) ?
 544       it->second.overscan_insets_in_dip() : gfx::Insets();
 545 }
 546
 547 void DisplayManager::SetColorCalibrationProfile(
 548     int64 display_id,
 549     ui::ColorCalibrationProfile profile) {
 550 #if defined(OS_CHROMEOS)
 551   if (!display_info_[display_id].IsColorProfileAvailable(profile))
 552     return;
 553
 554   if (delegate_)
 555     delegate_->PreDisplayConfigurationChange(false);
 556   // Just sets color profile if it's not running on ChromeOS (like tests).
 557   if (!base::SysInfo::IsRunningOnChromeOS() ||
 558       Shell::GetInstance()->display_configurator()->SetColorCalibrationProfile(
 559           display_id, profile)) {
 560     display_info_[display_id].SetColorProfile(profile);
 561     UMA_HISTOGRAM_ENUMERATION(
 562         "ChromeOS.Display.ColorProfile", profile, ui::NUM_COLOR_PROFILES);
 563   }
 564   if (delegate_)
 565     delegate_->PostDisplayConfigurationChange();
 566 #endif
 567 }
 568
 569 void DisplayManager::OnNativeDisplaysChanged(
 570     const std::vector<DisplayInfo>& updated_displays) {
 571   if (updated_displays.empty()) {
 572     VLOG(1) << "OnNativeDisplaysChanged(0): # of current displays="
 573             << active_display_list_.size();
 574     // If the device is booted without display, or chrome is started
 575     // without --ash-host-window-bounds on linux desktop, use the
 576     // default display.
 577     if (active_display_list_.empty()) {
 578       std::vector<DisplayInfo> init_displays;
 579       init_displays.push_back(DisplayInfo::CreateFromSpec(std::string()));
 580       MaybeInitInternalDisplay(&init_displays[0]);
 581       OnNativeDisplaysChanged(init_displays);
 582     } else {
 583       // Otherwise don't update the displays when all displays are disconnected.
 584       // This happens when:
 585       // - the device is idle and powerd requested to turn off all displays.
 586       // - the device is suspended. (kernel turns off all displays)
 587       // - the internal display's brightness is set to 0 and no external
 588       //   display is connected.
 589       // - the internal display's brightness is 0 and external display is
 590       //   disconnected.
 591       // The display will be updated when one of displays is turned on, and the
 592       // display list will be updated correctly.
 593     }
 594     return;
 595   }
 596   first_display_id_ = updated_displays[0].id();
 597   std::set<gfx::Point> origins;
 598
 599   if (updated_displays.size() == 1) {
 600     VLOG(1) << "OnNativeDisplaysChanged(1):" << updated_displays[0].ToString();
 601   } else {
 602     VLOG(1) << "OnNativeDisplaysChanged(" << updated_displays.size()
 603             << ") [0]=" << updated_displays[0].ToString()
 604             << ", [1]=" << updated_displays[1].ToString();
 605   }
 606
 607   bool internal_display_connected = false;
 608   num_connected_displays_ = updated_displays.size();
 609   mirroring_display_id_ = gfx::Display::kInvalidDisplayID;
 610   software_mirroring_display_list_.clear();
 611   DisplayInfoList new_display_info_list;
 612   for (DisplayInfoList::const_iterator iter = updated_displays.begin();
 613        iter != updated_displays.end();
 614        ++iter) {
 615     if (!internal_display_connected)
 616       internal_display_connected =
 617           gfx::Display::IsInternalDisplayId(iter->id());
 618     // Mirrored monitors have the same origins.
 619     gfx::Point origin = iter->bounds_in_native().origin();
 620     if (origins.find(origin) != origins.end()) {
 621       InsertAndUpdateDisplayInfo(*iter);
 622       mirroring_display_id_ = iter->id();
 623     } else {
 624       origins.insert(origin);
 625       new_display_info_list.push_back(*iter);
 626     }
 627
 628     DisplayMode new_mode;
 629     new_mode.size = iter->bounds_in_native().size();
 630     new_mode.device_scale_factor = iter->device_scale_factor();
 631     new_mode.ui_scale = iter->configured_ui_scale();
 632     const std::vector<DisplayMode>& display_modes = iter->display_modes();
 633     // This is empty the displays are initialized from InitFromCommandLine.
 634     if (!display_modes.size())
 635       continue;
 636     std::vector<DisplayMode>::const_iterator display_modes_iter =
 637         std::find_if(display_modes.begin(),
 638                      display_modes.end(),
 639                      DisplayModeMatcher(new_mode));
 640     // Update the actual resolution selected as the resolution request may fail.
 641     if (display_modes_iter == display_modes.end())
 642       display_modes_.erase(iter->id());
 643     else if (display_modes_.find(iter->id()) != display_modes_.end())
 644       display_modes_[iter->id()] = *display_modes_iter;
 645   }
 646   if (gfx::Display::HasInternalDisplay() && !internal_display_connected) {
 647     if (display_info_.find(gfx::Display::InternalDisplayId()) ==
 648         display_info_.end()) {
 649       // Create a dummy internal display if the chrome restarted
 650       // in docked mode.
 651       DisplayInfo internal_display_info(
 652           gfx::Display::InternalDisplayId(),
 653           l10n_util::GetStringUTF8(IDS_ASH_INTERNAL_DISPLAY_NAME),
 654           false /*Internal display must not have overscan */);
 655       internal_display_info.SetBounds(gfx::Rect(0, 0, 800, 600));
 656       display_info_[gfx::Display::InternalDisplayId()] = internal_display_info;
 657     } else {
 658       // Internal display is no longer active. Reset its rotation to user
 659       // preference, so that it is restored when the internal display becomes
 660       // active again.
 661       gfx::Display::Rotation user_rotation =
 662           display_info_[gfx::Display::InternalDisplayId()].GetRotation(
 663               gfx::Display::ROTATION_SOURCE_USER);
 664       display_info_[gfx::Display::InternalDisplayId()].SetRotation(
 665           user_rotation, gfx::Display::ROTATION_SOURCE_USER);
 666     }
 667   }
 668
 669 #if defined(OS_CHROMEOS)
 670   if (new_display_info_list.size() > 1) {
 671     std::sort(new_display_info_list.begin(), new_display_info_list.end(),
 672               DisplayInfoSortFunctor());
 673     DisplayIdPair pair = std::make_pair(new_display_info_list[0].id(),
 674                                         new_display_info_list[1].id());
 675     DisplayLayout layout = layout_store_->GetRegisteredDisplayLayout(pair);
 676     default_multi_display_mode_ =
 677         (layout.default_unified && switches::UnifiedDesktopEnabled())
 678             ? UNIFIED
 679             : EXTENDED;
 680     // Mirror mode is set by DisplayConfigurator on the device.
 681     // Emulate it when running on linux desktop.
 682     if (!base::SysInfo::IsRunningOnChromeOS() && layout.mirrored)
 683       SetMultiDisplayMode(MIRRORING);
 684   }
 685 #endif
 686
 687   UpdateDisplays(new_display_info_list);
 688 }
 689
 690 void DisplayManager::UpdateDisplays() {
 691   DisplayInfoList display_info_list;
 692   for (const auto& display : active_display_list_)
 693     display_info_list.push_back(GetDisplayInfo(display.id()));
 694   AddMirrorDisplayInfoIfAny(&display_info_list);
 695   UpdateDisplays(display_info_list);
 696 }
 697
 698 void DisplayManager::UpdateDisplays(
 699     const std::vector<DisplayInfo>& updated_display_info_list) {
 700 #if defined(OS_WIN)
 701   DCHECK_EQ(1u, updated_display_info_list.size()) <<
 702       ": Multiple display test does not work on Windows bots. Please "
 703       "skip (don't disable) the test using SupportsMultipleDisplays()";
 704 #endif
 705
 706   DisplayInfoList new_display_info_list = updated_display_info_list;
 707   std::sort(active_display_list_.begin(), active_display_list_.end(),
 708             DisplaySortFunctor());
 709   std::sort(new_display_info_list.begin(),
 710             new_display_info_list.end(),
 711             DisplayInfoSortFunctor());
 712
 713   if (multi_display_mode_ != MIRRORING)
 714     multi_display_mode_ = default_multi_display_mode_;
 715
 716   CreateSoftwareMirroringDisplayInfo(&new_display_info_list);
 717
 718   // Close the mirroring window if any here to avoid creating two compositor on
 719   // one display.
 720   if (delegate_)
 721     delegate_->CloseMirroringDisplayIfNotNecessary();
 722
 723   DisplayList new_displays;
 724   DisplayList removed_displays;
 725   std::map<size_t, uint32_t> display_changes;
 726   std::vector<size_t> added_display_indices;
 727
 728   DisplayList::iterator curr_iter = active_display_list_.begin();
 729   DisplayInfoList::const_iterator new_info_iter = new_display_info_list.begin();
 730
 731   while (curr_iter != active_display_list_.end() ||
 732          new_info_iter != new_display_info_list.end()) {
 733     if (curr_iter == active_display_list_.end()) {
 734       // more displays in new list.
 735       added_display_indices.push_back(new_displays.size());
 736       InsertAndUpdateDisplayInfo(*new_info_iter);
 737       new_displays.push_back(
 738           CreateDisplayFromDisplayInfoById(new_info_iter->id()));
 739       ++new_info_iter;
 740     } else if (new_info_iter == new_display_info_list.end()) {
 741       // more displays in current list.
 742       removed_displays.push_back(*curr_iter);
 743       ++curr_iter;
 744     } else if (curr_iter->id() == new_info_iter->id()) {
 745       const gfx::Display& current_display = *curr_iter;
 746       // Copy the info because |CreateDisplayFromInfo| updates the instance.
 747       const DisplayInfo current_display_info =
 748           GetDisplayInfo(current_display.id());
 749       InsertAndUpdateDisplayInfo(*new_info_iter);
 750       gfx::Display new_display =
 751           CreateDisplayFromDisplayInfoById(new_info_iter->id());
 752       const DisplayInfo& new_display_info = GetDisplayInfo(new_display.id());
 753
 754       uint32_t metrics = gfx::DisplayObserver::DISPLAY_METRIC_NONE;
 755
 756       // At that point the new Display objects we have are not entirely updated,
 757       // they are missing the translation related to the Display disposition in
 758       // the layout.
 759       // Using display.bounds() and display.work_area() would fail most of the
 760       // time.
 761       if (force_bounds_changed_ ||
 762           (current_display_info.bounds_in_native() !=
 763            new_display_info.bounds_in_native()) ||
 764           (current_display_info.GetOverscanInsetsInPixel() !=
 765            new_display_info.GetOverscanInsetsInPixel()) ||
 766           current_display.size() != new_display.size()) {
 767         metrics |= gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS |
 768             gfx::DisplayObserver::DISPLAY_METRIC_WORK_AREA;
 769       }
 770
 771       if (current_display.device_scale_factor() !=
 772           new_display.device_scale_factor()) {
 773         metrics |= gfx::DisplayObserver::DISPLAY_METRIC_DEVICE_SCALE_FACTOR;
 774       }
 775
 776       if (current_display.rotation() != new_display.rotation())
 777         metrics |= gfx::DisplayObserver::DISPLAY_METRIC_ROTATION;
 778
 779       if (metrics != gfx::DisplayObserver::DISPLAY_METRIC_NONE) {
 780         display_changes.insert(
 781             std::pair<size_t, uint32_t>(new_displays.size(), metrics));
 782       }
 783
 784       new_display.UpdateWorkAreaFromInsets(current_display.GetWorkAreaInsets());
 785       new_displays.push_back(new_display);
 786       ++curr_iter;
 787       ++new_info_iter;
 788     } else if (curr_iter->id() < new_info_iter->id()) {
 789       // more displays in current list between ids, which means it is deleted.
 790       removed_displays.push_back(*curr_iter);
 791       ++curr_iter;
 792     } else {
 793       // more displays in new list between ids, which means it is added.
 794       added_display_indices.push_back(new_displays.size());
 795       InsertAndUpdateDisplayInfo(*new_info_iter);
 796       new_displays.push_back(
 797           CreateDisplayFromDisplayInfoById(new_info_iter->id()));
 798       ++new_info_iter;
 799     }
 800   }
 801   gfx::Display old_primary;
 802   if (delegate_)
 803     old_primary = screen_->GetPrimaryDisplay();
 804
 805   // Clear focus if the display has been removed, but don't clear focus if
 806   // the destkop has been moved from one display to another
 807   // (mirror -> docked, docked -> single internal).
 808   bool clear_focus =
 809       !removed_displays.empty() &&
 810       !(removed_displays.size() == 1 && added_display_indices.size() == 1);
 811   if (delegate_)
 812     delegate_->PreDisplayConfigurationChange(clear_focus);
 813
 814   std::vector<size_t> updated_indices;
 815   if (UpdateNonPrimaryDisplayBoundsForLayout(&new_displays, &updated_indices)) {
 816     for (std::vector<size_t>::iterator it = updated_indices.begin();
 817          it != updated_indices.end(); ++it) {
 818       size_t updated_index = *it;
 819       if (std::find(added_display_indices.begin(),
 820                     added_display_indices.end(),
 821                     updated_index) == added_display_indices.end()) {
 822         uint32_t metrics = gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS |
 823                            gfx::DisplayObserver::DISPLAY_METRIC_WORK_AREA;
 824         if (display_changes.find(updated_index) != display_changes.end())
 825           metrics |= display_changes[updated_index];
 826
 827         display_changes[updated_index] = metrics;
 828       }
 829     }
 830   }
 831
 832   active_display_list_ = new_displays;
 833
 834   RefreshFontParams();
 835   base::AutoReset<bool> resetter(&change_display_upon_host_resize_, false);
 836
 837   int active_display_list_size = active_display_list_.size();
 838   // Temporarily add displays to be removed because display object
 839   // being removed are accessed during shutting down the root.
 840   active_display_list_.insert(active_display_list_.end(),
 841                               removed_displays.begin(), removed_displays.end());
 842
 843   for (const auto& display : removed_displays)
 844     screen_->NotifyDisplayRemoved(display);
 845
 846   for (size_t index : added_display_indices)
 847     screen_->NotifyDisplayAdded(active_display_list_[index]);
 848
 849   active_display_list_.resize(active_display_list_size);
 850
 851   bool notify_primary_change =
 852       delegate_ ? old_primary.id() != screen_->GetPrimaryDisplay().id() : false;
 853
 854   for (std::map<size_t, uint32_t>::iterator iter = display_changes.begin();
 855        iter != display_changes.end();
 856        ++iter) {
 857     uint32_t metrics = iter->second;
 858     const gfx::Display& updated_display = active_display_list_[iter->first];
 859
 860     if (notify_primary_change &&
 861         updated_display.id() == screen_->GetPrimaryDisplay().id()) {
 862       metrics |= gfx::DisplayObserver::DISPLAY_METRIC_PRIMARY;
 863       notify_primary_change = false;
 864     }
 865     screen_->NotifyMetricsChanged(updated_display, metrics);
 866   }
 867
 868   if (notify_primary_change) {
 869     // This happens when a primary display has moved to anther display without
 870     // bounds change.
 871     const gfx::Display& primary = screen_->GetPrimaryDisplay();
 872     if (primary.id() != old_primary.id()) {
 873       uint32_t metrics = gfx::DisplayObserver::DISPLAY_METRIC_PRIMARY;
 874       if (primary.size() != old_primary.size()) {
 875         metrics |= (gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS |
 876                     gfx::DisplayObserver::DISPLAY_METRIC_WORK_AREA);
 877       }
 878       if (primary.device_scale_factor() != old_primary.device_scale_factor())
 879         metrics |= gfx::DisplayObserver::DISPLAY_METRIC_DEVICE_SCALE_FACTOR;
 880
 881       screen_->NotifyMetricsChanged(primary, metrics);
 882     }
 883   }
 884
 885   if (delegate_)
 886     delegate_->PostDisplayConfigurationChange();
 887
 888 #if defined(USE_X11) && defined(OS_CHROMEOS)
 889   if (!display_changes.empty() && base::SysInfo::IsRunningOnChromeOS())
 890     ui::ClearX11DefaultRootWindow();
 891 #endif
 892
 893   // Create the mirroring window asynchronously after all displays
 894   // are added so that it can mirror the display newly added. This can
 895   // happen when switching from dock mode to software mirror mode.
 896   CreateMirrorWindowAsyncIfAny();
 897 }
 898
 899 const gfx::Display& DisplayManager::GetDisplayAt(size_t index) const {
 900   DCHECK_LT(index, active_display_list_.size());
 901   return active_display_list_[index];
 902 }
 903
 904 const gfx::Display& DisplayManager::GetPrimaryDisplayCandidate() const {
 905   if (GetNumDisplays() != 2)
 906     return active_display_list_[0];
 907   DisplayLayout layout = layout_store_->GetRegisteredDisplayLayout(
 908       GetCurrentDisplayIdPair());
 909   return GetDisplayForId(layout.primary_id);
 910 }
 911
 912 size_t DisplayManager::GetNumDisplays() const {
 913   return active_display_list_.size();
 914 }
 915
 916 bool DisplayManager::IsInMirrorMode() const {
 917   return mirroring_display_id_ != gfx::Display::kInvalidDisplayID;
 918 }
 919
 920 bool DisplayManager::IsInUnifiedMode() const {
 921   return multi_display_mode_ == UNIFIED &&
 922          !software_mirroring_display_list_.empty();
 923 }
 924
 925 const DisplayInfo& DisplayManager::GetDisplayInfo(int64 display_id) const {
 926   DCHECK_NE(gfx::Display::kInvalidDisplayID, display_id);
 927
 928   std::map<int64, DisplayInfo>::const_iterator iter =
 929       display_info_.find(display_id);
 930   CHECK(iter != display_info_.end()) << display_id;
 931   return iter->second;
 932 }
 933
 934 const gfx::Display DisplayManager::GetMirroringDisplayById(
 935     int64 display_id) const {
 936   auto iter = std::find_if(software_mirroring_display_list_.begin(),
 937                            software_mirroring_display_list_.end(),
 938                            [display_id](const gfx::Display& display) {
 939                              return display.id() == display_id;
 940                            });
 941   return iter == software_mirroring_display_list_.end() ? gfx::Display()
 942                                                         : *iter;
 943 }
 944
 945 std::string DisplayManager::GetDisplayNameForId(int64 id) {
 946   if (id == gfx::Display::kInvalidDisplayID)
 947     return l10n_util::GetStringUTF8(IDS_ASH_STATUS_TRAY_UNKNOWN_DISPLAY_NAME);
 948
 949   std::map<int64, DisplayInfo>::const_iterator iter = display_info_.find(id);
 950   if (iter != display_info_.end() && !iter->second.name().empty())
 951     return iter->second.name();
 952
 953   return base::StringPrintf("Display %d", static_cast<int>(id));
 954 }
 955
 956 int64 DisplayManager::GetDisplayIdForUIScaling() const {
 957   // UI Scaling is effective on internal display or on unified desktop.
 958   return IsInUnifiedMode() ? kUnifiedDisplayId
 959                            : (gfx::Display::HasInternalDisplay()
 960                                   ? gfx::Display::InternalDisplayId()
 961                                   : gfx::Display::kInvalidDisplayID);
 962 }
 963
 964 void DisplayManager::SetMirrorMode(bool mirror) {
 965 #if defined(OS_CHROMEOS)
 966   if (num_connected_displays() <= 1)
 967     return;
 968
 969   if (base::SysInfo::IsRunningOnChromeOS()) {
 970     ui::MultipleDisplayState new_state =
 971         mirror ? ui::MULTIPLE_DISPLAY_STATE_DUAL_MIRROR
 972                : ui::MULTIPLE_DISPLAY_STATE_DUAL_EXTENDED;
 973     Shell::GetInstance()->display_configurator()->SetDisplayMode(new_state);
 974     return;
 975   }
 976   multi_display_mode_ = mirror ? MIRRORING : default_multi_display_mode_;
 977   ReconfigureDisplays();
 978   if (Shell::GetInstance()->display_configurator_animation()) {
 979     Shell::GetInstance()->display_configurator_animation()->
 980         StartFadeInAnimation();
 981   }
 982   RunPendingTasksForTest();
 983 #endif
 984 }
 985
 986 void DisplayManager::AddRemoveDisplay() {
 987   DCHECK(!active_display_list_.empty());
 988   std::vector<DisplayInfo> new_display_info_list;
 989   const DisplayInfo& first_display =
 990       IsInUnifiedMode()
 991           ? GetDisplayInfo(software_mirroring_display_list_[0].id())
 992           : GetDisplayInfo(active_display_list_[0].id());
 993   new_display_info_list.push_back(first_display);
 994   // Add if there is only one display connected.
 995   if (num_connected_displays() == 1) {
 996     const int kVerticalOffsetPx = 100;
 997     // Layout the 2nd display below the primary as with the real device.
 998     gfx::Rect host_bounds = first_display.bounds_in_native();
 999     new_display_info_list.push_back(
1000         DisplayInfo::CreateFromSpec(base::StringPrintf(
1001             "%d+%d-600x%d", host_bounds.x(),
1002             host_bounds.bottom() + kVerticalOffsetPx, host_bounds.height())));
1003   }
1004   num_connected_displays_ = new_display_info_list.size();
1005   mirroring_display_id_ = gfx::Display::kInvalidDisplayID;
1006   software_mirroring_display_list_.clear();
1007   UpdateDisplays(new_display_info_list);
1008 }
1009
1010 void DisplayManager::ToggleDisplayScaleFactor() {
1011   DCHECK(!active_display_list_.empty());
1012   std::vector<DisplayInfo> new_display_info_list;
1013   for (DisplayList::const_iterator iter = active_display_list_.begin();
1014        iter != active_display_list_.end(); ++iter) {
1015     DisplayInfo display_info = GetDisplayInfo(iter->id());
1016     display_info.set_device_scale_factor(
1017         display_info.device_scale_factor() == 1.0f ? 2.0f : 1.0f);
1018     new_display_info_list.push_back(display_info);
1019   }
1020   AddMirrorDisplayInfoIfAny(&new_display_info_list);
1021   UpdateDisplays(new_display_info_list);
1022 }
1023
1024 #if defined(OS_CHROMEOS)
1025 void DisplayManager::SetSoftwareMirroring(bool enabled) {
1026   SetMultiDisplayMode(enabled ? MIRRORING : default_multi_display_mode_);
1027 }
1028
1029 bool DisplayManager::SoftwareMirroringEnabled() const {
1030   return software_mirroring_enabled();
1031 }
1032 #endif
1033
1034 void DisplayManager::SetMultiDisplayMode(MultiDisplayMode mode) {
1035   multi_display_mode_ = mode;
1036   mirroring_display_id_ = gfx::Display::kInvalidDisplayID;
1037   software_mirroring_display_list_.clear();
1038 }
1039
1040 void DisplayManager::SetDefaultMultiDisplayMode(MultiDisplayMode mode) {
1041   DCHECK_NE(mode, MIRRORING);
1042   default_multi_display_mode_ = mode;
1043 }
1044
1045 void DisplayManager::ReconfigureDisplays() {
1046   DisplayInfoList display_info_list;
1047   for (DisplayList::const_iterator iter = active_display_list_.begin();
1048        (display_info_list.size() < 2 && iter != active_display_list_.end());
1049        ++iter) {
1050     if (iter->id() == kUnifiedDisplayId)
1051       continue;
1052     display_info_list.push_back(GetDisplayInfo(iter->id()));
1053   }
1054   for (auto iter = software_mirroring_display_list_.begin();
1055        (display_info_list.size() < 2 &&
1056         iter != software_mirroring_display_list_.end());
1057        ++iter) {
1058     display_info_list.push_back(GetDisplayInfo(iter->id()));
1059   }
1060   mirroring_display_id_ = gfx::Display::kInvalidDisplayID;
1061   software_mirroring_display_list_.clear();
1062   UpdateDisplays(display_info_list);
1063 }
1064
1065 bool DisplayManager::UpdateDisplayBounds(int64 display_id,
1066                                          const gfx::Rect& new_bounds) {
1067   if (change_display_upon_host_resize_) {
1068     display_info_[display_id].SetBounds(new_bounds);
1069     // Don't notify observers if the mirrored window has changed.
1070     if (software_mirroring_enabled() && mirroring_display_id_ == display_id)
1071       return false;
1072     gfx::Display* display = FindDisplayForId(display_id);
1073     display->SetSize(display_info_[display_id].size_in_pixel());
1074     screen_->NotifyMetricsChanged(*display,
1075                                   gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS);
1076     return true;
1077   }
1078   return false;
1079 }
1080
1081 void DisplayManager::CreateMirrorWindowAsyncIfAny() {
1082   // Do not post a task if the software mirroring doesn't exist, or
1083   // during initialization when compositor's init task isn't posted yet.
1084   // ash::Shell::Init() will call this after the compositor is initialized.
1085   if (software_mirroring_display_list_.empty() || !delegate_)
1086     return;
1087   base::MessageLoopForUI::current()->PostTask(
1088       FROM_HERE,
1089       base::Bind(&DisplayManager::CreateMirrorWindowIfAny,
1090                  weak_ptr_factory_.GetWeakPtr()));
1091 }
1092
1093 scoped_ptr<MouseWarpController> DisplayManager::CreateMouseWarpController(
1094     aura::Window* drag_source) const {
1095   if (IsInUnifiedMode() && num_connected_displays() >= 2)
1096     return make_scoped_ptr(new UnifiedMouseWarpController());
1097   // Extra check for |num_connected_displays()| is for SystemDisplayApiTest
1098   // that injects MockScreen.
1099   if (GetNumDisplays() < 2 || num_connected_displays() < 2)
1100     return make_scoped_ptr(new NullMouseWarpController());
1101   return make_scoped_ptr(new ExtendedMouseWarpController(drag_source));
1102 }
1103
1104 void DisplayManager::CreateScreenForShutdown() const {
1105   bool native_is_ash =
1106       gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_NATIVE) == screen_.get();
1107   delete screen_for_shutdown;
1108   screen_for_shutdown = screen_->CloneForShutdown();
1109   gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_ALTERNATE,
1110                                  screen_for_shutdown);
1111   if (native_is_ash) {
1112     gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE,
1113                                    screen_for_shutdown);
1114   }
1115 }
1116
1117 void DisplayManager::UpdateInternalDisplayModeListForTest() {
1118   if (!gfx::Display::HasInternalDisplay() ||
1119       display_info_.count(gfx::Display::InternalDisplayId()) == 0)
1120     return;
1121   DisplayInfo* info = &display_info_[gfx::Display::InternalDisplayId()];
1122   SetInternalDisplayModeList(info);
1123 }
1124
1125 void DisplayManager::CreateSoftwareMirroringDisplayInfo(
1126     DisplayInfoList* display_info_list) {
1127   // Use the internal display or 1st as the mirror source, then scale
1128   // the root window so that it matches the external display's
1129   // resolution. This is necessary in order for scaling to work while
1130   // mirrored.
1131   if (display_info_list->size() == 2) {
1132     switch (multi_display_mode_) {
1133       case MIRRORING: {
1134         bool zero_is_source =
1135             first_display_id_ == (*display_info_list)[0].id() ||
1136             gfx::Display::IsInternalDisplayId((*display_info_list)[0].id());
1137         DCHECK_EQ(MIRRORING, multi_display_mode_);
1138         mirroring_display_id_ =
1139             (*display_info_list)[zero_is_source ? 1 : 0].id();
1140
1141         int64 display_id = mirroring_display_id_;
1142         auto iter =
1143             std::find_if(display_info_list->begin(), display_info_list->end(),
1144                          [display_id](const DisplayInfo& info) {
1145                            return info.id() == display_id;
1146                          });
1147         DCHECK(iter != display_info_list->end());
1148
1149         DisplayInfo info = *iter;
1150         info.SetOverscanInsets(gfx::Insets());
1151         InsertAndUpdateDisplayInfo(info);
1152         software_mirroring_display_list_.push_back(
1153             CreateMirroringDisplayFromDisplayInfoById(mirroring_display_id_,
1154                                                       gfx::Point(), 1.0f));
1155         display_info_list->erase(iter);
1156         break;
1157       }
1158       case UNIFIED: {
1159         // TODO(oshima): Currently, all displays are laid out horizontally,
1160         // from left to right. Allow more flexible layouts, such as
1161         // right to left, or vertical layouts.
1162         gfx::Rect unified_bounds;
1163         software_mirroring_display_list_.clear();
1164
1165         int max_height = std::numeric_limits<int>::min();
1166         for (auto& info : *display_info_list)
1167           max_height = std::max(max_height, info.size_in_pixel().height());
1168
1169         std::vector<DisplayMode> display_mode_list;
1170         std::set<float> ui_scales;
1171
1172         for (auto& info : *display_info_list) {
1173           InsertAndUpdateDisplayInfo(info);
1174           gfx::Point origin(unified_bounds.right(), 0);
1175           float ui_scale =
1176               info.size_in_pixel().height() / static_cast<float>(max_height);
1177           // The display is scaled to fit the unified desktop size.
1178           gfx::Display display = CreateMirroringDisplayFromDisplayInfoById(
1179               info.id(), origin, 1.0f / ui_scale);
1180           display.UpdateWorkAreaFromInsets(gfx::Insets());
1181           unified_bounds.Union(display.bounds());
1182
1183           ui_scales.insert(ui_scale);
1184
1185           software_mirroring_display_list_.push_back(display);
1186         }
1187         DisplayInfo info(kUnifiedDisplayId, "Unified Desktop", false);
1188         info.SetBounds(unified_bounds);
1189
1190         DisplayMode native_mode(unified_bounds.size(), 60.0f, false, true);
1191         info.SetDisplayModes(
1192             CreateUnifiedDisplayModeList(native_mode, ui_scales));
1193
1194         display_info_list->clear();
1195         display_info_list->push_back(info);
1196         InsertAndUpdateDisplayInfo(info);
1197         break;
1198       }
1199       case EXTENDED:
1200         break;
1201     }
1202   }
1203 }
1204
1205 gfx::Display* DisplayManager::FindDisplayForId(int64 id) {
1206   auto iter = std::find_if(
1207       active_display_list_.begin(), active_display_list_.end(),
1208       [id](const gfx::Display& display) { return display.id() == id; });
1209   if (iter != active_display_list_.end())
1210     return &(*iter);
1211   // TODO(oshima): This happens when a windows in unified desktop have
1212   // been moved to normal window. Fix this.
1213   if (id != kUnifiedDisplayId)
1214     DLOG(WARNING) << "Could not find display:" << id;
1215   return NULL;
1216 }
1217
1218 void DisplayManager::AddMirrorDisplayInfoIfAny(
1219     std::vector<DisplayInfo>* display_info_list) {
1220   if (software_mirroring_enabled() && IsInMirrorMode())
1221     display_info_list->push_back(GetDisplayInfo(mirroring_display_id_));
1222 }
1223
1224 void DisplayManager::InsertAndUpdateDisplayInfo(const DisplayInfo& new_info) {
1225   std::map<int64, DisplayInfo>::iterator info =
1226       display_info_.find(new_info.id());
1227   if (info != display_info_.end()) {
1228     info->second.Copy(new_info);
1229   } else {
1230     display_info_[new_info.id()] = new_info;
1231     display_info_[new_info.id()].set_native(false);
1232   }
1233   display_info_[new_info.id()].UpdateDisplaySize();
1234   OnDisplayInfoUpdated(display_info_[new_info.id()]);
1235 }
1236
1237 void DisplayManager::OnDisplayInfoUpdated(const DisplayInfo& display_info) {
1238 #if defined(OS_CHROMEOS)
1239   ui::ColorCalibrationProfile color_profile = display_info.color_profile();
1240   if (color_profile != ui::COLOR_PROFILE_STANDARD) {
1241     Shell::GetInstance()->display_configurator()->SetColorCalibrationProfile(
1242         display_info.id(), color_profile);
1243   }
1244 #endif
1245 }
1246
1247 gfx::Display DisplayManager::CreateDisplayFromDisplayInfoById(int64 id) {
1248   DCHECK(display_info_.find(id) != display_info_.end()) << "id=" << id;
1249   const DisplayInfo& display_info = display_info_[id];
1250
1251   gfx::Display new_display(display_info.id());
1252   gfx::Rect bounds_in_native(display_info.size_in_pixel());
1253   float device_scale_factor = display_info.GetEffectiveDeviceScaleFactor();
1254
1255   // Simply set the origin to (0,0).  The primary display's origin is
1256   // always (0,0) and the bounds of non-primary display(s) will be updated
1257   // in |UpdateNonPrimaryDisplayBoundsForLayout| called in |UpdateDisplay|.
1258   new_display.SetScaleAndBounds(
1259       device_scale_factor, gfx::Rect(bounds_in_native.size()));
1260   new_display.set_rotation(display_info.GetActiveRotation());
1261   new_display.set_touch_support(display_info.touch_support());
1262   return new_display;
1263 }
1264
1265 gfx::Display DisplayManager::CreateMirroringDisplayFromDisplayInfoById(
1266     int64 id,
1267     const gfx::Point& origin,
1268     float scale) {
1269   DCHECK(display_info_.find(id) != display_info_.end()) << "id=" << id;
1270   const DisplayInfo& display_info = display_info_[id];
1271
1272   gfx::Display new_display(display_info.id());
1273   new_display.SetScaleAndBounds(
1274       1.0f, gfx::Rect(origin, gfx::ToFlooredSize(gfx::ScaleSize(
1275                                   display_info.size_in_pixel(), scale))));
1276   new_display.set_touch_support(display_info.touch_support());
1277   return new_display;
1278 }
1279
1280 bool DisplayManager::UpdateNonPrimaryDisplayBoundsForLayout(
1281     DisplayList* displays,
1282     std::vector<size_t>* updated_indices) const {
1283
1284   if (displays->size() < 2U)
1285     return false;
1286
1287   if (displays->size() > 2U) {
1288     // For more than 2 displays, always use horizontal layout.
1289     int x_offset = displays->at(0).bounds().width();
1290     for (size_t i = 1; i < displays->size(); ++i) {
1291       gfx::Display& display = displays->at(i);
1292       const gfx::Rect& bounds = display.bounds();
1293       gfx::Point origin = gfx::Point(x_offset, 0);
1294       gfx::Insets insets = display.GetWorkAreaInsets();
1295       display.set_bounds(gfx::Rect(origin, bounds.size()));
1296       display.UpdateWorkAreaFromInsets(insets);
1297       x_offset += bounds.width();
1298       updated_indices->push_back(i);
1299     }
1300     return true;
1301   }
1302
1303   int64 id_at_zero = displays->at(0).id();
1304   DisplayIdPair pair = (id_at_zero == first_display_id_ ||
1305                         gfx::Display::IsInternalDisplayId(id_at_zero))
1306                            ? std::make_pair(id_at_zero, displays->at(1).id())
1307                            : std::make_pair(displays->at(1).id(), id_at_zero);
1308   DisplayLayout layout =
1309       layout_store_->ComputeDisplayLayoutForDisplayIdPair(pair);
1310
1311   // Ignore if a user has a old format (should be extremely rare)
1312   // and this will be replaced with DCHECK.
1313   if (layout.primary_id != gfx::Display::kInvalidDisplayID) {
1314     size_t primary_index, secondary_index;
1315     if (displays->at(0).id() == layout.primary_id) {
1316       primary_index = 0;
1317       secondary_index = 1;
1318     } else {
1319       primary_index = 1;
1320       secondary_index = 0;
1321     }
1322     // This function may be called before the secondary display is
1323     // registered. The bounds is empty in that case and will
1324     // return true.
1325     gfx::Rect bounds =
1326         GetDisplayForId(displays->at(secondary_index).id()).bounds();
1327     UpdateDisplayBoundsForLayout(
1328         layout, displays->at(primary_index), &displays->at(secondary_index));
1329     updated_indices->push_back(secondary_index);
1330     return bounds != displays->at(secondary_index).bounds();
1331   }
1332   return false;
1333 }
1334
1335 void DisplayManager::CreateMirrorWindowIfAny() {
1336   if (software_mirroring_display_list_.empty() || !delegate_)
1337     return;
1338   DisplayInfoList list;
1339   for (auto& display : software_mirroring_display_list_)
1340     list.push_back(GetDisplayInfo(display.id()));
1341   delegate_->CreateOrUpdateMirroringDisplay(list);
1342 }
1343
1344 // static
1345 void DisplayManager::UpdateDisplayBoundsForLayout(
1346     const DisplayLayout& layout,
1347     const gfx::Display& primary_display,
1348     gfx::Display* secondary_display) {
1349   DCHECK_EQ("0,0", primary_display.bounds().origin().ToString());
1350
1351   const gfx::Rect& primary_bounds = primary_display.bounds();
1352   const gfx::Rect& secondary_bounds = secondary_display->bounds();
1353   gfx::Point new_secondary_origin = primary_bounds.origin();
1354
1355   DisplayLayout::Position position = layout.position;
1356
1357   // Ignore the offset in case the secondary display doesn't share edges with
1358   // the primary display.
1359   int offset = layout.offset;
1360   if (position == DisplayLayout::TOP || position == DisplayLayout::BOTTOM) {
1361     offset = std::min(
1362         offset, primary_bounds.width() - kMinimumOverlapForInvalidOffset);
1363     offset = std::max(
1364         offset, -secondary_bounds.width() + kMinimumOverlapForInvalidOffset);
1365   } else {
1366     offset = std::min(
1367         offset, primary_bounds.height() - kMinimumOverlapForInvalidOffset);
1368     offset = std::max(
1369         offset, -secondary_bounds.height() + kMinimumOverlapForInvalidOffset);
1370   }
1371   switch (position) {
1372     case DisplayLayout::TOP:
1373       new_secondary_origin.Offset(offset, -secondary_bounds.height());
1374       break;
1375     case DisplayLayout::RIGHT:
1376       new_secondary_origin.Offset(primary_bounds.width(), offset);
1377       break;
1378     case DisplayLayout::BOTTOM:
1379       new_secondary_origin.Offset(offset, primary_bounds.height());
1380       break;
1381     case DisplayLayout::LEFT:
1382       new_secondary_origin.Offset(-secondary_bounds.width(), offset);
1383       break;
1384   }
1385   gfx::Insets insets = secondary_display->GetWorkAreaInsets();
1386   secondary_display->set_bounds(
1387       gfx::Rect(new_secondary_origin, secondary_bounds.size()));
1388   secondary_display->UpdateWorkAreaFromInsets(insets);
1389 }
1390
1391 void DisplayManager::RunPendingTasksForTest() {
1392   if (!software_mirroring_display_list_.empty())
1393     base::RunLoop().RunUntilIdle();
1394 }
1395
1396 }  // namespace ash