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/screen_ash.h"
  17 #include "ash/screen_util.h"
  18 #include "ash/shell.h"
  19 #include "base/auto_reset.h"
  20 #include "base/command_line.h"
  21 #include "base/logging.h"
  22 #include "base/metrics/histogram.h"
  23 #include "base/strings/string_number_conversions.h"
  24 #include "base/strings/string_split.h"
  25 #include "base/strings/stringprintf.h"
  26 #include "base/strings/utf_string_conversions.h"
  27 #include "grit/ash_strings.h"
  28 #include "ui/base/l10n/l10n_util.h"
  29 #include "ui/gfx/display.h"
  30 #include "ui/gfx/display_observer.h"
  31 #include "ui/gfx/font_render_params.h"
  32 #include "ui/gfx/geometry/rect.h"
  33 #include "ui/gfx/geometry/size_conversions.h"
  34 #include "ui/gfx/screen.h"
  35
  36 #if defined(USE_X11)
  37 #include "ui/base/x/x11_util.h"
  38 #endif
  39
  40 #if defined(OS_CHROMEOS)
  41 #include "ash/display/display_configurator_animation.h"
  42 #include "base/sys_info.h"
  43 #endif
  44
  45 #if defined(OS_WIN)
  46 #include "base/win/windows_version.h"
  47 #endif
  48
  49 namespace ash {
  50 typedef std::vector<gfx::Display> DisplayList;
  51 typedef std::vector<DisplayInfo> DisplayInfoList;
  52
  53 namespace {
  54
  55 // We need to keep this in order for unittests to tell if
  56 // the object in gfx::Screen::GetScreenByType is for shutdown.
  57 gfx::Screen* screen_for_shutdown = NULL;
  58
  59 // The number of pixels to overlap between the primary and secondary displays,
  60 // in case that the offset value is too large.
  61 const int kMinimumOverlapForInvalidOffset = 100;
  62
  63 struct DisplaySortFunctor {
  64   bool operator()(const gfx::Display& a, const gfx::Display& b) {
  65     return a.id() < b.id();
  66   }
  67 };
  68
  69 struct DisplayInfoSortFunctor {
  70   bool operator()(const DisplayInfo& a, const DisplayInfo& b) {
  71     return a.id() < b.id();
  72   }
  73 };
  74
  75 struct DisplayModeMatcher {
  76   DisplayModeMatcher(const DisplayMode& target_mode)
  77       : target_mode(target_mode) {}
  78   bool operator()(const DisplayMode& mode) {
  79     return target_mode.IsEquivalent(mode);
  80   }
  81   DisplayMode target_mode;
  82 };
  83
  84 gfx::Display& GetInvalidDisplay() {
  85   static gfx::Display* invalid_display = new gfx::Display();
  86   return *invalid_display;
  87 }
  88
  89 void SetInternalDisplayModeList(DisplayInfo* info) {
  90   DisplayMode native_mode;
  91   native_mode.size = info->bounds_in_native().size();
  92   native_mode.device_scale_factor = info->device_scale_factor();
  93   native_mode.ui_scale = 1.0f;
  94   info->SetDisplayModes(CreateInternalDisplayModeList(native_mode));
  95 }
  96
  97 void MaybeInitInternalDisplay(DisplayInfo* info) {
  98   int64 id = info->id();
  99   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
 100   if (command_line->HasSwitch(switches::kAshUseFirstDisplayAsInternal)) {
 101     gfx::Display::SetInternalDisplayId(id);
 102     SetInternalDisplayModeList(info);
 103   }
 104 }
 105
 106 }  // namespace
 107
 108 using std::string;
 109 using std::vector;
 110
 111 DisplayManager::DisplayManager()
 112     : delegate_(NULL),
 113       screen_ash_(new ScreenAsh),
 114       screen_(screen_ash_.get()),
 115       layout_store_(new DisplayLayoutStore),
 116       first_display_id_(gfx::Display::kInvalidDisplayID),
 117       num_connected_displays_(0),
 118       force_bounds_changed_(false),
 119       change_display_upon_host_resize_(false),
 120       second_display_mode_(EXTENDED),
 121       mirrored_display_id_(gfx::Display::kInvalidDisplayID),
 122       registered_internal_display_rotation_lock_(false),
 123       registered_internal_display_rotation_(gfx::Display::ROTATE_0),
 124       weak_ptr_factory_(this) {
 125
 126 #if defined(OS_CHROMEOS)
 127   // Enable only on the device so that DisplayManagerFontTest passes.
 128   if (base::SysInfo::IsRunningOnChromeOS())
 129     DisplayInfo::SetUse125DSFForUIScaling(true);
 130
 131   change_display_upon_host_resize_ = !base::SysInfo::IsRunningOnChromeOS();
 132 #endif
 133   gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_ALTERNATE,
 134                                  screen_ash_.get());
 135   gfx::Screen* current_native =
 136       gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_NATIVE);
 137   // If there is no native, or the native was for shutdown,
 138   // use ash's screen.
 139   if (!current_native ||
 140       current_native == screen_for_shutdown) {
 141     gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE,
 142                                    screen_ash_.get());
 143   }
 144 }
 145
 146 DisplayManager::~DisplayManager() {
 147 #if defined(OS_CHROMEOS)
 148   // Reset the font params.
 149   gfx::SetFontRenderParamsDeviceScaleFactor(1.0f);
 150 #endif
 151 }
 152
 153 bool DisplayManager::InitFromCommandLine() {
 154   DisplayInfoList info_list;
 155   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
 156   if (!command_line->HasSwitch(switches::kAshHostWindowBounds))
 157     return false;
 158   const string size_str =
 159       command_line->GetSwitchValueASCII(switches::kAshHostWindowBounds);
 160   vector<string> parts;
 161   base::SplitString(size_str, ',', &parts);
 162   for (vector<string>::const_iterator iter = parts.begin();
 163        iter != parts.end(); ++iter) {
 164     info_list.push_back(DisplayInfo::CreateFromSpec(*iter));
 165     info_list.back().set_native(true);
 166   }
 167   MaybeInitInternalDisplay(&info_list[0]);
 168   if (info_list.size() > 1 &&
 169       command_line->HasSwitch(switches::kAshEnableSoftwareMirroring)) {
 170     SetSecondDisplayMode(MIRRORING);
 171   }
 172   OnNativeDisplaysChanged(info_list);
 173   return true;
 174 }
 175
 176 void DisplayManager::InitDefaultDisplay() {
 177   DisplayInfoList info_list;
 178   info_list.push_back(DisplayInfo::CreateFromSpec(std::string()));
 179   info_list.back().set_native(true);
 180   MaybeInitInternalDisplay(&info_list[0]);
 181   OnNativeDisplaysChanged(info_list);
 182 }
 183
 184 void DisplayManager::RefreshFontParams() {
 185 #if defined(OS_CHROMEOS)
 186   // Use the largest device scale factor among currently active displays. Non
 187   // internal display may have bigger scale factor in case the external display
 188   // is an 4K display.
 189   float largest_device_scale_factor = 1.0f;
 190   for (const gfx::Display& display : displays_) {
 191     const ash::DisplayInfo& info = display_info_[display.id()];
 192     largest_device_scale_factor = std::max(
 193         largest_device_scale_factor, info.GetEffectiveDeviceScaleFactor());
 194   }
 195   gfx::SetFontRenderParamsDeviceScaleFactor(largest_device_scale_factor);
 196 #endif  // OS_CHROMEOS
 197 }
 198
 199 bool DisplayManager::IsActiveDisplay(const gfx::Display& display) const {
 200   for (DisplayList::const_iterator iter = displays_.begin();
 201        iter != displays_.end(); ++iter) {
 202     if ((*iter).id() == display.id())
 203       return true;
 204   }
 205   return false;
 206 }
 207
 208 bool DisplayManager::HasInternalDisplay() const {
 209   return gfx::Display::InternalDisplayId() != gfx::Display::kInvalidDisplayID;
 210 }
 211
 212 bool DisplayManager::IsInternalDisplayId(int64 id) const {
 213   return gfx::Display::InternalDisplayId() == id;
 214 }
 215
 216 DisplayLayout DisplayManager::GetCurrentDisplayLayout() {
 217   DCHECK_LE(2U, num_connected_displays());
 218   // Invert if the primary was swapped.
 219   if (num_connected_displays() == 2) {
 220     DisplayIdPair pair = GetCurrentDisplayIdPair();
 221     return layout_store_->ComputeDisplayLayoutForDisplayIdPair(pair);
 222   } else if (num_connected_displays() > 2) {
 223     // Return fixed horizontal layout for >= 3 displays.
 224     DisplayLayout layout(DisplayLayout::RIGHT, 0);
 225     return layout;
 226   }
 227   NOTREACHED() << "DisplayLayout is requested for single display";
 228   // On release build, just fallback to default instead of blowing up.
 229   DisplayLayout layout =
 230       layout_store_->default_display_layout();
 231   layout.primary_id = displays_[0].id();
 232   return layout;
 233 }
 234
 235 DisplayIdPair DisplayManager::GetCurrentDisplayIdPair() const {
 236   if (IsMirrored()) {
 237     if (software_mirroring_enabled()) {
 238       CHECK_EQ(2u, num_connected_displays());
 239       // This comment is to make it easy to distinguish the crash
 240       // between two checks.
 241       CHECK_EQ(1u, displays_.size());
 242     }
 243     return std::make_pair(displays_[0].id(), mirrored_display_id_);
 244   } else {
 245     CHECK_LE(2u, displays_.size());
 246     int64 id_at_zero = displays_[0].id();
 247     if (id_at_zero == gfx::Display::InternalDisplayId() ||
 248         id_at_zero == first_display_id()) {
 249       return std::make_pair(id_at_zero, displays_[1].id());
 250     } else {
 251       return std::make_pair(displays_[1].id(), id_at_zero);
 252     }
 253   }
 254 }
 255
 256 void DisplayManager::SetLayoutForCurrentDisplays(
 257     const DisplayLayout& layout_relative_to_primary) {
 258   if (GetNumDisplays() != 2)
 259     return;
 260   const gfx::Display& primary = screen_->GetPrimaryDisplay();
 261   const DisplayIdPair pair = GetCurrentDisplayIdPair();
 262   // Invert if the primary was swapped.
 263   DisplayLayout to_set = pair.first == primary.id() ?
 264       layout_relative_to_primary : layout_relative_to_primary.Invert();
 265
 266   DisplayLayout current_layout =
 267       layout_store_->GetRegisteredDisplayLayout(pair);
 268   if (to_set.position != current_layout.position ||
 269       to_set.offset != current_layout.offset) {
 270     to_set.primary_id = primary.id();
 271     layout_store_->RegisterLayoutForDisplayIdPair(
 272         pair.first, pair.second, to_set);
 273     if (delegate_)
 274       delegate_->PreDisplayConfigurationChange(false);
 275     // PreDisplayConfigurationChange(false);
 276     // TODO(oshima): Call UpdateDisplays instead.
 277     const DisplayLayout layout = GetCurrentDisplayLayout();
 278     UpdateDisplayBoundsForLayout(
 279         layout, primary,
 280         FindDisplayForId(ScreenUtil::GetSecondaryDisplay().id()));
 281
 282     // Primary's bounds stay the same. Just notify bounds change
 283     // on the secondary.
 284     screen_ash_->NotifyMetricsChanged(
 285         ScreenUtil::GetSecondaryDisplay(),
 286         gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS |
 287         gfx::DisplayObserver::DISPLAY_METRIC_WORK_AREA);
 288     if (delegate_)
 289       delegate_->PostDisplayConfigurationChange();
 290   }
 291 }
 292
 293 const gfx::Display& DisplayManager::GetDisplayForId(int64 id) const {
 294   gfx::Display* display =
 295       const_cast<DisplayManager*>(this)->FindDisplayForId(id);
 296   return display ? *display : GetInvalidDisplay();
 297 }
 298
 299 const gfx::Display& DisplayManager::FindDisplayContainingPoint(
 300     const gfx::Point& point_in_screen) const {
 301   for (DisplayList::const_iterator iter = displays_.begin();
 302        iter != displays_.end(); ++iter) {
 303     const gfx::Display& display = *iter;
 304     if (display.bounds().Contains(point_in_screen))
 305       return display;
 306   }
 307   return GetInvalidDisplay();
 308 }
 309
 310 bool DisplayManager::UpdateWorkAreaOfDisplay(int64 display_id,
 311                                              const gfx::Insets& insets) {
 312   gfx::Display* display = FindDisplayForId(display_id);
 313   DCHECK(display);
 314   gfx::Rect old_work_area = display->work_area();
 315   display->UpdateWorkAreaFromInsets(insets);
 316   return old_work_area != display->work_area();
 317 }
 318
 319 void DisplayManager::SetOverscanInsets(int64 display_id,
 320                                        const gfx::Insets& insets_in_dip) {
 321   bool update = false;
 322   DisplayInfoList display_info_list;
 323   for (DisplayList::const_iterator iter = displays_.begin();
 324        iter != displays_.end(); ++iter) {
 325     DisplayInfo info = GetDisplayInfo(iter->id());
 326     if (info.id() == display_id) {
 327       if (insets_in_dip.empty()) {
 328         info.set_clear_overscan_insets(true);
 329       } else {
 330         info.set_clear_overscan_insets(false);
 331         info.SetOverscanInsets(insets_in_dip);
 332       }
 333       update = true;
 334     }
 335     display_info_list.push_back(info);
 336   }
 337   if (update) {
 338     AddMirrorDisplayInfoIfAny(&display_info_list);
 339     UpdateDisplays(display_info_list);
 340   } else {
 341     display_info_[display_id].SetOverscanInsets(insets_in_dip);
 342   }
 343 }
 344
 345 void DisplayManager::SetDisplayRotation(int64 display_id,
 346                                         gfx::Display::Rotation rotation) {
 347   DisplayInfoList display_info_list;
 348   for (DisplayList::const_iterator iter = displays_.begin();
 349        iter != displays_.end(); ++iter) {
 350     DisplayInfo info = GetDisplayInfo(iter->id());
 351     if (info.id() == display_id) {
 352       if (info.rotation() == rotation)
 353         return;
 354       info.set_rotation(rotation);
 355     }
 356     display_info_list.push_back(info);
 357   }
 358   AddMirrorDisplayInfoIfAny(&display_info_list);
 359   UpdateDisplays(display_info_list);
 360 }
 361
 362 bool DisplayManager::SetDisplayUIScale(int64 display_id,
 363                                        float ui_scale) {
 364   if (!IsDisplayUIScalingEnabled() ||
 365       gfx::Display::InternalDisplayId() != display_id) {
 366     return false;
 367   }
 368   bool found = false;
 369   // TODO(mukai): merge this implementation into SetDisplayMode().
 370   DisplayInfoList display_info_list;
 371   for (DisplayList::const_iterator iter = displays_.begin();
 372        iter != displays_.end(); ++iter) {
 373     DisplayInfo info = GetDisplayInfo(iter->id());
 374     if (info.id() == display_id) {
 375       found = true;
 376       if (info.configured_ui_scale() == ui_scale)
 377         return true;
 378       if (!HasDisplayModeForUIScale(info, ui_scale))
 379         return false;
 380       info.set_configured_ui_scale(ui_scale);
 381     }
 382     display_info_list.push_back(info);
 383   }
 384   if (found) {
 385     AddMirrorDisplayInfoIfAny(&display_info_list);
 386     UpdateDisplays(display_info_list);
 387     return true;
 388   }
 389   return false;
 390 }
 391
 392 void DisplayManager::SetDisplayResolution(int64 display_id,
 393                                           const gfx::Size& resolution) {
 394   DCHECK_NE(gfx::Display::InternalDisplayId(), display_id);
 395   if (gfx::Display::InternalDisplayId() == display_id)
 396     return;
 397   const DisplayInfo& display_info = GetDisplayInfo(display_id);
 398   const std::vector<DisplayMode>& modes = display_info.display_modes();
 399   DCHECK_NE(0u, modes.size());
 400   DisplayMode target_mode;
 401   target_mode.size = resolution;
 402   std::vector<DisplayMode>::const_iterator iter =
 403       std::find_if(modes.begin(), modes.end(), DisplayModeMatcher(target_mode));
 404   if (iter == modes.end()) {
 405     LOG(WARNING) << "Unsupported resolution was requested:"
 406                  << resolution.ToString();
 407     return;
 408   }
 409   display_modes_[display_id] = *iter;
 410 #if defined(OS_CHROMEOS)
 411   if (base::SysInfo::IsRunningOnChromeOS())
 412     Shell::GetInstance()->display_configurator()->OnConfigurationChanged();
 413 #endif
 414 }
 415
 416 bool DisplayManager::SetDisplayMode(int64 display_id,
 417                                     const DisplayMode& display_mode) {
 418   if (IsInternalDisplayId(display_id)) {
 419     SetDisplayUIScale(display_id, display_mode.ui_scale);
 420     return false;
 421   }
 422
 423   DisplayInfoList display_info_list;
 424   bool display_property_changed = false;
 425   bool resolution_changed = false;
 426   for (DisplayList::const_iterator iter = displays_.begin();
 427        iter != displays_.end(); ++iter) {
 428     DisplayInfo info = GetDisplayInfo(iter->id());
 429     if (info.id() == display_id) {
 430       const std::vector<DisplayMode>& modes = info.display_modes();
 431       std::vector<DisplayMode>::const_iterator iter =
 432           std::find_if(modes.begin(),
 433                        modes.end(),
 434                        DisplayModeMatcher(display_mode));
 435       if (iter == modes.end()) {
 436         LOG(WARNING) << "Unsupported resolution was requested:"
 437                      << display_mode.size.ToString();
 438         return false;
 439       }
 440       display_modes_[display_id] = *iter;
 441       if (info.bounds_in_native().size() != display_mode.size)
 442         resolution_changed = true;
 443       if (info.device_scale_factor() != display_mode.device_scale_factor) {
 444         info.set_device_scale_factor(display_mode.device_scale_factor);
 445         display_property_changed = true;
 446       }
 447     }
 448     display_info_list.push_back(info);
 449   }
 450   if (display_property_changed) {
 451     AddMirrorDisplayInfoIfAny(&display_info_list);
 452     UpdateDisplays(display_info_list);
 453   }
 454 #if defined(OS_CHROMEOS)
 455   if (resolution_changed && base::SysInfo::IsRunningOnChromeOS())
 456     Shell::GetInstance()->display_configurator()->OnConfigurationChanged();
 457 #endif
 458   return resolution_changed;
 459 }
 460
 461 void DisplayManager::RegisterDisplayProperty(
 462     int64 display_id,
 463     gfx::Display::Rotation rotation,
 464     float ui_scale,
 465     const gfx::Insets* overscan_insets,
 466     const gfx::Size& resolution_in_pixels,
 467     float device_scale_factor,
 468     ui::ColorCalibrationProfile color_profile) {
 469   if (display_info_.find(display_id) == display_info_.end())
 470     display_info_[display_id] = DisplayInfo(display_id, std::string(), false);
 471
 472   display_info_[display_id].set_rotation(rotation);
 473   display_info_[display_id].SetColorProfile(color_profile);
 474   // Just in case the preference file was corrupted.
 475   // TODO(mukai): register |display_modes_| here as well, so the lookup for the
 476   // default mode in GetActiveModeForDisplayId() gets much simpler.
 477   if (0.5f <= ui_scale && ui_scale <= 2.0f)
 478     display_info_[display_id].set_configured_ui_scale(ui_scale);
 479   if (overscan_insets)
 480     display_info_[display_id].SetOverscanInsets(*overscan_insets);
 481   if (!resolution_in_pixels.IsEmpty()) {
 482     DCHECK(!IsInternalDisplayId(display_id));
 483     // Default refresh rate, until OnNativeDisplaysChanged() updates us with the
 484     // actual display info, is 60 Hz.
 485     DisplayMode mode(resolution_in_pixels, 60.0f, false, false);
 486     mode.device_scale_factor = device_scale_factor;
 487     display_modes_[display_id] = mode;
 488   }
 489 }
 490
 491 DisplayMode DisplayManager::GetActiveModeForDisplayId(int64 display_id) const {
 492   DisplayMode selected_mode;
 493   if (GetSelectedModeForDisplayId(display_id, &selected_mode))
 494     return selected_mode;
 495
 496   // If 'selected' mode is empty, it should return the default mode. This means
 497   // the native mode for the external display. Unfortunately this is not true
 498   // for the internal display because restoring UI-scale doesn't register the
 499   // restored mode to |display_mode_|, so it needs to look up the mode whose
 500   // UI-scale value matches. See the TODO in RegisterDisplayProperty().
 501   const DisplayInfo& info = GetDisplayInfo(display_id);
 502   const std::vector<DisplayMode>& display_modes = info.display_modes();
 503
 504   if (IsInternalDisplayId(display_id)) {
 505     for (size_t i = 0; i < display_modes.size(); ++i) {
 506       if (info.configured_ui_scale() == display_modes[i].ui_scale)
 507         return display_modes[i];
 508     }
 509   } else {
 510     for (size_t i = 0; i < display_modes.size(); ++i) {
 511       if (display_modes[i].native)
 512         return display_modes[i];
 513     }
 514   }
 515   return selected_mode;
 516 }
 517
 518 void DisplayManager::RegisterDisplayRotationProperties(bool rotation_lock,
 519     gfx::Display::Rotation rotation) {
 520   if (delegate_)
 521     delegate_->PreDisplayConfigurationChange(false);
 522   registered_internal_display_rotation_lock_ = rotation_lock;
 523   registered_internal_display_rotation_ = rotation;
 524   if (delegate_)
 525     delegate_->PostDisplayConfigurationChange();
 526 }
 527
 528 bool DisplayManager::GetSelectedModeForDisplayId(int64 id,
 529                                                  DisplayMode* mode_out) const {
 530   std::map<int64, DisplayMode>::const_iterator iter = display_modes_.find(id);
 531   if (iter == display_modes_.end())
 532     return false;
 533   *mode_out = iter->second;
 534   return true;
 535 }
 536
 537 bool DisplayManager::IsDisplayUIScalingEnabled() const {
 538   return GetDisplayIdForUIScaling() != gfx::Display::kInvalidDisplayID;
 539 }
 540
 541 gfx::Insets DisplayManager::GetOverscanInsets(int64 display_id) const {
 542   std::map<int64, DisplayInfo>::const_iterator it =
 543       display_info_.find(display_id);
 544   return (it != display_info_.end()) ?
 545       it->second.overscan_insets_in_dip() : gfx::Insets();
 546 }
 547
 548 void DisplayManager::SetColorCalibrationProfile(
 549     int64 display_id,
 550     ui::ColorCalibrationProfile profile) {
 551 #if defined(OS_CHROMEOS)
 552   if (!display_info_[display_id].IsColorProfileAvailable(profile))
 553     return;
 554
 555   if (delegate_)
 556     delegate_->PreDisplayConfigurationChange(false);
 557   // Just sets color profile if it's not running on ChromeOS (like tests).
 558   if (!base::SysInfo::IsRunningOnChromeOS() ||
 559       Shell::GetInstance()->display_configurator()->SetColorCalibrationProfile(
 560           display_id, profile)) {
 561     display_info_[display_id].SetColorProfile(profile);
 562     UMA_HISTOGRAM_ENUMERATION(
 563         "ChromeOS.Display.ColorProfile", profile, ui::NUM_COLOR_PROFILES);
 564   }
 565   if (delegate_)
 566     delegate_->PostDisplayConfigurationChange();
 567 #endif
 568 }
 569
 570 void DisplayManager::OnNativeDisplaysChanged(
 571     const std::vector<DisplayInfo>& updated_displays) {
 572   if (updated_displays.empty()) {
 573     VLOG(1) << "OnNativeDisplaysChanged(0): # of current displays="
 574             << displays_.size();
 575     // If the device is booted without display, or chrome is started
 576     // without --ash-host-window-bounds on linux desktop, use the
 577     // default display.
 578     if (displays_.empty()) {
 579       std::vector<DisplayInfo> init_displays;
 580       init_displays.push_back(DisplayInfo::CreateFromSpec(std::string()));
 581       MaybeInitInternalDisplay(&init_displays[0]);
 582       OnNativeDisplaysChanged(init_displays);
 583     } else {
 584       // Otherwise don't update the displays when all displays are disconnected.
 585       // This happens when:
 586       // - the device is idle and powerd requested to turn off all displays.
 587       // - the device is suspended. (kernel turns off all displays)
 588       // - the internal display's brightness is set to 0 and no external
 589       //   display is connected.
 590       // - the internal display's brightness is 0 and external display is
 591       //   disconnected.
 592       // The display will be updated when one of displays is turned on, and the
 593       // display list will be updated correctly.
 594     }
 595     return;
 596   }
 597   first_display_id_ = updated_displays[0].id();
 598   std::set<gfx::Point> origins;
 599
 600   if (updated_displays.size() == 1) {
 601     VLOG(1) << "OnNativeDisplaysChanged(1):" << updated_displays[0].ToString();
 602   } else {
 603     VLOG(1) << "OnNativeDisplaysChanged(" << updated_displays.size()
 604             << ") [0]=" << updated_displays[0].ToString()
 605             << ", [1]=" << updated_displays[1].ToString();
 606   }
 607
 608   bool internal_display_connected = false;
 609   num_connected_displays_ = updated_displays.size();
 610   mirrored_display_id_ = gfx::Display::kInvalidDisplayID;
 611   mirroring_display_ = gfx::Display();
 612   DisplayInfoList new_display_info_list;
 613   for (DisplayInfoList::const_iterator iter = updated_displays.begin();
 614        iter != updated_displays.end();
 615        ++iter) {
 616     if (!internal_display_connected)
 617       internal_display_connected = 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       mirrored_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 (HasInternalDisplay() &&
 647       !internal_display_connected &&
 648       display_info_.find(gfx::Display::InternalDisplayId()) ==
 649       display_info_.end()) {
 650     DisplayInfo internal_display_info(
 651         gfx::Display::InternalDisplayId(),
 652         l10n_util::GetStringUTF8(IDS_ASH_INTERNAL_DISPLAY_NAME),
 653         false  /*Internal display must not have overscan */);
 654     internal_display_info.SetBounds(gfx::Rect(0, 0, 800, 600));
 655     display_info_[gfx::Display::InternalDisplayId()] = internal_display_info;
 656   }
 657   UpdateDisplays(new_display_info_list);
 658 }
 659
 660 void DisplayManager::UpdateDisplays() {
 661   DisplayInfoList display_info_list;
 662   for (DisplayList::const_iterator iter = displays_.begin();
 663        iter != displays_.end(); ++iter) {
 664     display_info_list.push_back(GetDisplayInfo(iter->id()));
 665   }
 666   AddMirrorDisplayInfoIfAny(&display_info_list);
 667   UpdateDisplays(display_info_list);
 668 }
 669
 670 void DisplayManager::UpdateDisplays(
 671     const std::vector<DisplayInfo>& updated_display_info_list) {
 672 #if defined(OS_WIN)
 673   DCHECK_EQ(1u, updated_display_info_list.size()) <<
 674       ": Multiple display test does not work on Windows bots. Please "
 675       "skip (don't disable) the test using SupportsMultipleDisplays()";
 676 #endif
 677
 678   DisplayInfoList new_display_info_list = updated_display_info_list;
 679   std::sort(displays_.begin(), displays_.end(), DisplaySortFunctor());
 680   std::sort(new_display_info_list.begin(),
 681             new_display_info_list.end(),
 682             DisplayInfoSortFunctor());
 683   DisplayList removed_displays;
 684   std::map<size_t, uint32_t> display_changes;
 685   std::vector<size_t> added_display_indices;
 686
 687   DisplayList::iterator curr_iter = displays_.begin();
 688   DisplayInfoList::const_iterator new_info_iter = new_display_info_list.begin();
 689
 690   DisplayList new_displays;
 691
 692   // Use the internal display or 1st as the mirror source, then scale
 693   // the root window so that it matches the external display's
 694   // resolution. This is necessary in order for scaling to work while
 695   // mirrored.
 696   int64 mirroing_display_id = gfx::Display::kInvalidDisplayID;
 697
 698   if (second_display_mode_ != EXTENDED && new_display_info_list.size() == 2) {
 699     bool zero_is_source =
 700         first_display_id_ == new_display_info_list[0].id() ||
 701         gfx::Display::InternalDisplayId() == new_display_info_list[0].id();
 702     DCHECK_EQ(MIRRORING, second_display_mode_);
 703     mirrored_display_id_ = new_display_info_list[zero_is_source ? 1 : 0].id();
 704     mirroing_display_id = mirrored_display_id_;
 705   }
 706
 707   while (curr_iter != displays_.end() ||
 708          new_info_iter != new_display_info_list.end()) {
 709     if (new_info_iter != new_display_info_list.end() &&
 710         mirroing_display_id == new_info_iter->id()) {
 711       DisplayInfo info = *new_info_iter;
 712       info.SetOverscanInsets(gfx::Insets());
 713       InsertAndUpdateDisplayInfo(info);
 714       mirroring_display_ =
 715           CreateDisplayFromDisplayInfoById(mirroing_display_id);
 716       ++new_info_iter;
 717       // Remove existing external display if it is going to be used as
 718       // mirroring display.
 719       if (curr_iter != displays_.end() &&
 720           curr_iter->id() == mirroing_display_id) {
 721         removed_displays.push_back(*curr_iter);
 722         ++curr_iter;
 723       }
 724       continue;
 725     }
 726
 727     if (curr_iter == displays_.end()) {
 728       // more displays in new list.
 729       added_display_indices.push_back(new_displays.size());
 730       InsertAndUpdateDisplayInfo(*new_info_iter);
 731       new_displays.push_back(
 732           CreateDisplayFromDisplayInfoById(new_info_iter->id()));
 733       ++new_info_iter;
 734     } else if (new_info_iter == new_display_info_list.end()) {
 735       // more displays in current list.
 736       removed_displays.push_back(*curr_iter);
 737       ++curr_iter;
 738     } else if (curr_iter->id() == new_info_iter->id()) {
 739       const gfx::Display& current_display = *curr_iter;
 740       // Copy the info because |CreateDisplayFromInfo| updates the instance.
 741       const DisplayInfo current_display_info =
 742           GetDisplayInfo(current_display.id());
 743       InsertAndUpdateDisplayInfo(*new_info_iter);
 744       gfx::Display new_display =
 745           CreateDisplayFromDisplayInfoById(new_info_iter->id());
 746       const DisplayInfo& new_display_info = GetDisplayInfo(new_display.id());
 747
 748       uint32_t metrics = gfx::DisplayObserver::DISPLAY_METRIC_NONE;
 749
 750       // At that point the new Display objects we have are not entirely updated,
 751       // they are missing the translation related to the Display disposition in
 752       // the layout.
 753       // Using display.bounds() and display.work_area() would fail most of the
 754       // time.
 755       if (force_bounds_changed_ ||
 756           (current_display_info.bounds_in_native() !=
 757            new_display_info.bounds_in_native()) ||
 758           (current_display_info.GetOverscanInsetsInPixel() !=
 759            new_display_info.GetOverscanInsetsInPixel()) ||
 760           current_display.size() != new_display.size()) {
 761         metrics |= gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS |
 762             gfx::DisplayObserver::DISPLAY_METRIC_WORK_AREA;
 763       }
 764
 765       if (current_display.device_scale_factor() !=
 766           new_display.device_scale_factor()) {
 767         metrics |= gfx::DisplayObserver::DISPLAY_METRIC_DEVICE_SCALE_FACTOR;
 768       }
 769
 770       if (current_display.rotation() != new_display.rotation())
 771         metrics |= gfx::DisplayObserver::DISPLAY_METRIC_ROTATION;
 772
 773       if (metrics != gfx::DisplayObserver::DISPLAY_METRIC_NONE) {
 774         display_changes.insert(
 775             std::pair<size_t, uint32_t>(new_displays.size(), metrics));
 776       }
 777
 778       new_display.UpdateWorkAreaFromInsets(current_display.GetWorkAreaInsets());
 779       new_displays.push_back(new_display);
 780       ++curr_iter;
 781       ++new_info_iter;
 782     } else if (curr_iter->id() < new_info_iter->id()) {
 783       // more displays in current list between ids, which means it is deleted.
 784       removed_displays.push_back(*curr_iter);
 785       ++curr_iter;
 786     } else {
 787       // more displays in new list between ids, which means it is added.
 788       added_display_indices.push_back(new_displays.size());
 789       InsertAndUpdateDisplayInfo(*new_info_iter);
 790       new_displays.push_back(
 791           CreateDisplayFromDisplayInfoById(new_info_iter->id()));
 792       ++new_info_iter;
 793     }
 794   }
 795   gfx::Display old_primary;
 796   if (delegate_)
 797     old_primary = screen_ash_->GetPrimaryDisplay();
 798
 799   // Clear focus if the display has been removed, but don't clear focus if
 800   // the destkop has been moved from one display to another
 801   // (mirror -> docked, docked -> single internal).
 802   bool clear_focus =
 803       !removed_displays.empty() &&
 804       !(removed_displays.size() == 1 && added_display_indices.size() == 1);
 805   if (delegate_)
 806     delegate_->PreDisplayConfigurationChange(clear_focus);
 807
 808   // Do not update |displays_| if there's nothing to be updated. Without this,
 809   // it will not update the display layout, which causes the bug
 810   // http://crbug.com/155948.
 811   if (display_changes.empty() && added_display_indices.empty() &&
 812       removed_displays.empty()) {
 813     // When changing from software mirroring mode to sinlge display
 814     // mode, it is possible there is no need to update |displays_| and
 815     // we early out here. But we still need to update the mirroring
 816     // window and call the PostDisplayConfigurationChange() cause
 817     // there are some clients need to act on this,
 818     // e.g. TouchTransformerController needs to adjust the
 819     // TouchTransformer when/ switching from dual displays to single
 820     // display.
 821     if (delegate_) {
 822       if (HasSoftwareMirroringDisplay())
 823         CreateMirrorWindowAsyncIfAny();
 824       else
 825         delegate_->CloseMirroringDisplay();
 826       delegate_->PostDisplayConfigurationChange();
 827     }
 828     return;
 829   }
 830
 831   std::vector<size_t> updated_indices;
 832   if (UpdateNonPrimaryDisplayBoundsForLayout(&new_displays, &updated_indices)) {
 833     for (std::vector<size_t>::iterator it = updated_indices.begin();
 834          it != updated_indices.end(); ++it) {
 835       size_t updated_index = *it;
 836       if (std::find(added_display_indices.begin(),
 837                     added_display_indices.end(),
 838                     updated_index) == added_display_indices.end()) {
 839         uint32_t metrics = gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS |
 840                            gfx::DisplayObserver::DISPLAY_METRIC_WORK_AREA;
 841         if (display_changes.find(updated_index) != display_changes.end())
 842           metrics |= display_changes[updated_index];
 843
 844         display_changes[updated_index] = metrics;
 845       }
 846     }
 847   }
 848
 849   displays_ = new_displays;
 850
 851   RefreshFontParams();
 852   base::AutoReset<bool> resetter(&change_display_upon_host_resize_, false);
 853
 854   // Temporarily add displays to be removed because display object
 855   // being removed are accessed during shutting down the root.
 856   displays_.insert(displays_.end(), removed_displays.begin(),
 857                    removed_displays.end());
 858
 859   for (DisplayList::const_reverse_iterator iter = removed_displays.rbegin();
 860        iter != removed_displays.rend(); ++iter) {
 861     screen_ash_->NotifyDisplayRemoved(displays_.back());
 862     displays_.pop_back();
 863   }
 864
 865   bool has_mirroring_display = HasSoftwareMirroringDisplay();
 866   // Close the mirroring window here to avoid creating two compositor on
 867   // one display.
 868   if (!has_mirroring_display && delegate_)
 869     delegate_->CloseMirroringDisplay();
 870
 871   for (std::vector<size_t>::iterator iter = added_display_indices.begin();
 872        iter != added_display_indices.end(); ++iter) {
 873     screen_ash_->NotifyDisplayAdded(displays_[*iter]);
 874   }
 875
 876   bool notify_primary_change =
 877       delegate_ ? old_primary.id() != screen_->GetPrimaryDisplay().id() : false;
 878
 879   for (std::map<size_t, uint32_t>::iterator iter = display_changes.begin();
 880        iter != display_changes.end();
 881        ++iter) {
 882     uint32_t metrics = iter->second;
 883     const gfx::Display& updated_display = displays_[iter->first];
 884
 885     if (notify_primary_change &&
 886         updated_display.id() == screen_->GetPrimaryDisplay().id()) {
 887       metrics |= gfx::DisplayObserver::DISPLAY_METRIC_PRIMARY;
 888       notify_primary_change = false;
 889     }
 890     screen_ash_->NotifyMetricsChanged(updated_display, metrics);
 891   }
 892
 893   if (notify_primary_change) {
 894     // This happens when a primary display has moved to anther display without
 895     // bounds change.
 896     const gfx::Display& primary = screen_->GetPrimaryDisplay();
 897     if (primary.id() != old_primary.id()) {
 898       uint32_t metrics = gfx::DisplayObserver::DISPLAY_METRIC_PRIMARY;
 899       if (primary.size() != old_primary.size()) {
 900         metrics |= (gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS |
 901                     gfx::DisplayObserver::DISPLAY_METRIC_WORK_AREA);
 902       }
 903       if (primary.device_scale_factor() != old_primary.device_scale_factor())
 904         metrics |= gfx::DisplayObserver::DISPLAY_METRIC_DEVICE_SCALE_FACTOR;
 905
 906       screen_ash_->NotifyMetricsChanged(primary, metrics);
 907     }
 908   }
 909
 910   if (delegate_)
 911     delegate_->PostDisplayConfigurationChange();
 912
 913 #if defined(USE_X11) && defined(OS_CHROMEOS)
 914   if (!display_changes.empty() && base::SysInfo::IsRunningOnChromeOS())
 915     ui::ClearX11DefaultRootWindow();
 916 #endif
 917
 918   // Create the mirroring window asynchronously after all displays
 919   // are added so that it can mirror the display newly added. This can
 920   // happen when switching from dock mode to software mirror mode.
 921   CreateMirrorWindowAsyncIfAny();
 922 }
 923
 924 const gfx::Display& DisplayManager::GetDisplayAt(size_t index) const {
 925   DCHECK_LT(index, displays_.size());
 926   return displays_[index];
 927 }
 928
 929 const gfx::Display& DisplayManager::GetPrimaryDisplayCandidate() const {
 930   if (GetNumDisplays() != 2)
 931     return displays_[0];
 932   DisplayLayout layout = layout_store_->GetRegisteredDisplayLayout(
 933       GetCurrentDisplayIdPair());
 934   return GetDisplayForId(layout.primary_id);
 935 }
 936
 937 size_t DisplayManager::GetNumDisplays() const {
 938   return displays_.size();
 939 }
 940
 941 bool DisplayManager::IsMirrored() const {
 942   return mirrored_display_id_ != gfx::Display::kInvalidDisplayID;
 943 }
 944
 945 const DisplayInfo& DisplayManager::GetDisplayInfo(int64 display_id) const {
 946   DCHECK_NE(gfx::Display::kInvalidDisplayID, display_id);
 947
 948   std::map<int64, DisplayInfo>::const_iterator iter =
 949       display_info_.find(display_id);
 950   CHECK(iter != display_info_.end()) << display_id;
 951   return iter->second;
 952 }
 953
 954 std::string DisplayManager::GetDisplayNameForId(int64 id) {
 955   if (id == gfx::Display::kInvalidDisplayID)
 956     return l10n_util::GetStringUTF8(IDS_ASH_STATUS_TRAY_UNKNOWN_DISPLAY_NAME);
 957
 958   std::map<int64, DisplayInfo>::const_iterator iter = display_info_.find(id);
 959   if (iter != display_info_.end() && !iter->second.name().empty())
 960     return iter->second.name();
 961
 962   return base::StringPrintf("Display %d", static_cast<int>(id));
 963 }
 964
 965 int64 DisplayManager::GetDisplayIdForUIScaling() const {
 966   // UI Scaling is effective only on internal display.
 967   int64 display_id = gfx::Display::InternalDisplayId();
 968 #if defined(OS_WIN)
 969   display_id = first_display_id();
 970 #endif
 971   return display_id;
 972 }
 973
 974 void DisplayManager::SetMirrorMode(bool mirrored) {
 975   if (num_connected_displays() <= 1)
 976     return;
 977
 978 #if defined(OS_CHROMEOS)
 979   if (base::SysInfo::IsRunningOnChromeOS()) {
 980     ui::MultipleDisplayState new_state =
 981         mirrored ? ui::MULTIPLE_DISPLAY_STATE_DUAL_MIRROR :
 982                    ui::MULTIPLE_DISPLAY_STATE_DUAL_EXTENDED;
 983     Shell::GetInstance()->display_configurator()->SetDisplayMode(new_state);
 984     return;
 985   }
 986 #endif
 987   // This is fallback path to emulate mirroroing on desktop.
 988   SetSecondDisplayMode(mirrored ? MIRRORING : EXTENDED);
 989   DisplayInfoList display_info_list;
 990   int count = 0;
 991   for (std::map<int64, DisplayInfo>::const_iterator iter =
 992            display_info_.begin();
 993        count < 2; ++iter, ++count) {
 994     display_info_list.push_back(GetDisplayInfo(iter->second.id()));
 995   }
 996   UpdateDisplays(display_info_list);
 997 #if defined(OS_CHROMEOS)
 998   if (Shell::GetInstance()->display_configurator_animation()) {
 999     Shell::GetInstance()->display_configurator_animation()->
1000         StartFadeInAnimation();
1001   }
1002 #endif
1003 }
1004
1005 void DisplayManager::AddRemoveDisplay() {
1006   DCHECK(!displays_.empty());
1007   std::vector<DisplayInfo> new_display_info_list;
1008   const DisplayInfo& first_display = GetDisplayInfo(displays_[0].id());
1009   new_display_info_list.push_back(first_display);
1010   // Add if there is only one display connected.
1011   if (num_connected_displays() == 1) {
1012     // Layout the 2nd display below the primary as with the real device.
1013     gfx::Rect host_bounds = first_display.bounds_in_native();
1014     new_display_info_list.push_back(DisplayInfo::CreateFromSpec(
1015         base::StringPrintf(
1016             "%d+%d-500x400", host_bounds.x(), host_bounds.bottom())));
1017   }
1018   num_connected_displays_ = new_display_info_list.size();
1019   mirrored_display_id_ = gfx::Display::kInvalidDisplayID;
1020   mirroring_display_ = gfx::Display();
1021   UpdateDisplays(new_display_info_list);
1022 }
1023
1024 void DisplayManager::ToggleDisplayScaleFactor() {
1025   DCHECK(!displays_.empty());
1026   std::vector<DisplayInfo> new_display_info_list;
1027   for (DisplayList::const_iterator iter = displays_.begin();
1028        iter != displays_.end(); ++iter) {
1029     DisplayInfo display_info = GetDisplayInfo(iter->id());
1030     display_info.set_device_scale_factor(
1031         display_info.device_scale_factor() == 1.0f ? 2.0f : 1.0f);
1032     new_display_info_list.push_back(display_info);
1033   }
1034   AddMirrorDisplayInfoIfAny(&new_display_info_list);
1035   UpdateDisplays(new_display_info_list);
1036 }
1037
1038 #if defined(OS_CHROMEOS)
1039 void DisplayManager::SetSoftwareMirroring(bool enabled) {
1040   SetSecondDisplayMode(enabled ? MIRRORING : EXTENDED);
1041 }
1042
1043 bool DisplayManager::SoftwareMirroringEnabled() const {
1044   return software_mirroring_enabled();
1045 }
1046 #endif
1047
1048 void DisplayManager::SetSecondDisplayMode(SecondDisplayMode mode) {
1049   second_display_mode_ = mode;
1050   mirrored_display_id_ = gfx::Display::kInvalidDisplayID;
1051   mirroring_display_ = gfx::Display();
1052 }
1053
1054 bool DisplayManager::UpdateDisplayBounds(int64 display_id,
1055                                          const gfx::Rect& new_bounds) {
1056   if (change_display_upon_host_resize_) {
1057     display_info_[display_id].SetBounds(new_bounds);
1058     // Don't notify observers if the mirrored window has changed.
1059     if (software_mirroring_enabled() && mirrored_display_id_ == display_id)
1060       return false;
1061     gfx::Display* display = FindDisplayForId(display_id);
1062     display->SetSize(display_info_[display_id].size_in_pixel());
1063     screen_ash_->NotifyMetricsChanged(
1064         *display, gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS);
1065     return true;
1066   }
1067   return false;
1068 }
1069
1070 void DisplayManager::CreateMirrorWindowAsyncIfAny() {
1071   // Do not post a task if the software mirroring doesn't exist, or
1072   // during initialization when compositor's init task isn't posted yet.
1073   // ash::Shell::Init() will call this after the compositor is initialized.
1074   if (!HasSoftwareMirroringDisplay() || !delegate_)
1075     return;
1076   base::MessageLoopForUI::current()->PostTask(
1077       FROM_HERE,
1078       base::Bind(&DisplayManager::CreateMirrorWindowIfAny,
1079                  weak_ptr_factory_.GetWeakPtr()));
1080 }
1081
1082 void DisplayManager::CreateScreenForShutdown() const {
1083   bool native_is_ash =
1084       gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_NATIVE) ==
1085       screen_ash_.get();
1086   delete screen_for_shutdown;
1087   screen_for_shutdown = screen_ash_->CloneForShutdown();
1088   gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_ALTERNATE,
1089                                  screen_for_shutdown);
1090   if (native_is_ash) {
1091     gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE,
1092                                    screen_for_shutdown);
1093   }
1094 }
1095
1096 void DisplayManager::UpdateInternalDisplayModeListForTest() {
1097   if (display_info_.count(gfx::Display::InternalDisplayId()) == 0)
1098     return;
1099   DisplayInfo* info = &display_info_[gfx::Display::InternalDisplayId()];
1100   SetInternalDisplayModeList(info);
1101 }
1102
1103 gfx::Display* DisplayManager::FindDisplayForId(int64 id) {
1104   for (DisplayList::iterator iter = displays_.begin();
1105        iter != displays_.end(); ++iter) {
1106     if ((*iter).id() == id)
1107       return &(*iter);
1108   }
1109   DLOG(WARNING) << "Could not find display:" << id;
1110   return NULL;
1111 }
1112
1113 void DisplayManager::AddMirrorDisplayInfoIfAny(
1114     std::vector<DisplayInfo>* display_info_list) {
1115   if (software_mirroring_enabled() && IsMirrored())
1116     display_info_list->push_back(GetDisplayInfo(mirrored_display_id_));
1117 }
1118
1119 void DisplayManager::InsertAndUpdateDisplayInfo(const DisplayInfo& new_info) {
1120   std::map<int64, DisplayInfo>::iterator info =
1121       display_info_.find(new_info.id());
1122   if (info != display_info_.end()) {
1123     info->second.Copy(new_info);
1124   } else {
1125     display_info_[new_info.id()] = new_info;
1126     display_info_[new_info.id()].set_native(false);
1127   }
1128   display_info_[new_info.id()].UpdateDisplaySize();
1129   OnDisplayInfoUpdated(display_info_[new_info.id()]);
1130 }
1131
1132 void DisplayManager::OnDisplayInfoUpdated(const DisplayInfo& display_info) {
1133 #if defined(OS_CHROMEOS)
1134   ui::ColorCalibrationProfile color_profile = display_info.color_profile();
1135   if (color_profile != ui::COLOR_PROFILE_STANDARD) {
1136     Shell::GetInstance()->display_configurator()->SetColorCalibrationProfile(
1137         display_info.id(), color_profile);
1138   }
1139 #endif
1140 }
1141
1142 gfx::Display DisplayManager::CreateDisplayFromDisplayInfoById(int64 id) {
1143   DCHECK(display_info_.find(id) != display_info_.end());
1144   const DisplayInfo& display_info = display_info_[id];
1145
1146   gfx::Display new_display(display_info.id());
1147   gfx::Rect bounds_in_native(display_info.size_in_pixel());
1148   float device_scale_factor = display_info.GetEffectiveDeviceScaleFactor();
1149
1150   // Simply set the origin to (0,0).  The primary display's origin is
1151   // always (0,0) and the bounds of non-primary display(s) will be updated
1152   // in |UpdateNonPrimaryDisplayBoundsForLayout| called in |UpdateDisplay|.
1153   new_display.SetScaleAndBounds(
1154       device_scale_factor, gfx::Rect(bounds_in_native.size()));
1155   new_display.set_rotation(display_info.rotation());
1156   new_display.set_touch_support(display_info.touch_support());
1157   return new_display;
1158 }
1159
1160 bool DisplayManager::UpdateNonPrimaryDisplayBoundsForLayout(
1161     DisplayList* displays,
1162     std::vector<size_t>* updated_indices) const {
1163
1164   if (displays->size() < 2U)
1165     return false;
1166
1167   if (displays->size() > 2U) {
1168     // For more than 2 displays, always use horizontal layout.
1169     int x_offset = displays->at(0).bounds().width();
1170     for (size_t i = 1; i < displays->size(); ++i) {
1171       gfx::Display& display = displays->at(i);
1172       const gfx::Rect& bounds = display.bounds();
1173       gfx::Point origin = gfx::Point(x_offset, 0);
1174       gfx::Insets insets = display.GetWorkAreaInsets();
1175       display.set_bounds(gfx::Rect(origin, bounds.size()));
1176       display.UpdateWorkAreaFromInsets(insets);
1177       x_offset += bounds.width();
1178       updated_indices->push_back(i);
1179     }
1180     return true;
1181   }
1182
1183   int64 id_at_zero = displays->at(0).id();
1184   DisplayIdPair pair =
1185       (id_at_zero == first_display_id_ ||
1186        id_at_zero == gfx::Display::InternalDisplayId()) ?
1187       std::make_pair(id_at_zero, displays->at(1).id()) :
1188       std::make_pair(displays->at(1).id(), id_at_zero);
1189   DisplayLayout layout =
1190       layout_store_->ComputeDisplayLayoutForDisplayIdPair(pair);
1191
1192   // Ignore if a user has a old format (should be extremely rare)
1193   // and this will be replaced with DCHECK.
1194   if (layout.primary_id != gfx::Display::kInvalidDisplayID) {
1195     size_t primary_index, secondary_index;
1196     if (displays->at(0).id() == layout.primary_id) {
1197       primary_index = 0;
1198       secondary_index = 1;
1199     } else {
1200       primary_index = 1;
1201       secondary_index = 0;
1202     }
1203     // This function may be called before the secondary display is
1204     // registered. The bounds is empty in that case and will
1205     // return true.
1206     gfx::Rect bounds =
1207         GetDisplayForId(displays->at(secondary_index).id()).bounds();
1208     UpdateDisplayBoundsForLayout(
1209         layout, displays->at(primary_index), &displays->at(secondary_index));
1210     updated_indices->push_back(secondary_index);
1211     return bounds != displays->at(secondary_index).bounds();
1212   }
1213   return false;
1214 }
1215
1216 void DisplayManager::CreateMirrorWindowIfAny() {
1217   if (HasSoftwareMirroringDisplay() && delegate_) {
1218     DisplayInfo display_info = GetDisplayInfo(mirroring_display_.id());
1219     delegate_->CreateOrUpdateMirroringDisplay(display_info);
1220   }
1221 }
1222
1223 bool DisplayManager::HasSoftwareMirroringDisplay() {
1224   return second_display_mode_ != DisplayManager::EXTENDED &&
1225       mirroring_display_.is_valid();
1226 }
1227
1228 // static
1229 void DisplayManager::UpdateDisplayBoundsForLayout(
1230     const DisplayLayout& layout,
1231     const gfx::Display& primary_display,
1232     gfx::Display* secondary_display) {
1233   DCHECK_EQ("0,0", primary_display.bounds().origin().ToString());
1234
1235   const gfx::Rect& primary_bounds = primary_display.bounds();
1236   const gfx::Rect& secondary_bounds = secondary_display->bounds();
1237   gfx::Point new_secondary_origin = primary_bounds.origin();
1238
1239   DisplayLayout::Position position = layout.position;
1240
1241   // Ignore the offset in case the secondary display doesn't share edges with
1242   // the primary display.
1243   int offset = layout.offset;
1244   if (position == DisplayLayout::TOP || position == DisplayLayout::BOTTOM) {
1245     offset = std::min(
1246         offset, primary_bounds.width() - kMinimumOverlapForInvalidOffset);
1247     offset = std::max(
1248         offset, -secondary_bounds.width() + kMinimumOverlapForInvalidOffset);
1249   } else {
1250     offset = std::min(
1251         offset, primary_bounds.height() - kMinimumOverlapForInvalidOffset);
1252     offset = std::max(
1253         offset, -secondary_bounds.height() + kMinimumOverlapForInvalidOffset);
1254   }
1255   switch (position) {
1256     case DisplayLayout::TOP:
1257       new_secondary_origin.Offset(offset, -secondary_bounds.height());
1258       break;
1259     case DisplayLayout::RIGHT:
1260       new_secondary_origin.Offset(primary_bounds.width(), offset);
1261       break;
1262     case DisplayLayout::BOTTOM:
1263       new_secondary_origin.Offset(offset, primary_bounds.height());
1264       break;
1265     case DisplayLayout::LEFT:
1266       new_secondary_origin.Offset(-secondary_bounds.width(), offset);
1267       break;
1268   }
1269   gfx::Insets insets = secondary_display->GetWorkAreaInsets();
1270   secondary_display->set_bounds(
1271       gfx::Rect(new_secondary_origin, secondary_bounds.size()));
1272   secondary_display->UpdateWorkAreaFromInsets(insets);
1273 }
1274
1275 }  // namespace ash