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/screen_ash.h"
16#include "ash/screen_util.h"
17#include "ash/shell.h"
18#include "base/auto_reset.h"
19#include "base/command_line.h"
20#include "base/logging.h"
21#include "base/metrics/histogram.h"
22#include "base/strings/string_number_conversions.h"
23#include "base/strings/string_split.h"
24#include "base/strings/stringprintf.h"
25#include "base/strings/utf_string_conversions.h"
26#include "grit/ash_strings.h"
27#include "ui/base/l10n/l10n_util.h"
28#include "ui/gfx/display.h"
29#include "ui/gfx/display_observer.h"
30#include "ui/gfx/font_render_params.h"
31#include "ui/gfx/rect.h"
32#include "ui/gfx/screen.h"
33#include "ui/gfx/size_conversions.h"
34
35#if defined(USE_X11)
36#include "ui/base/x/x11_util.h"
37#endif
38
39#if defined(OS_CHROMEOS)
40#include "ash/display/display_configurator_animation.h"
41#include "base/sys_info.h"
42#endif
43
44#if defined(OS_WIN)
45#include "base/win/windows_version.h"
46#endif
47
48namespace ash {
49typedef std::vector<gfx::Display> DisplayList;
50typedef std::vector<DisplayInfo> DisplayInfoList;
51
52namespace {
53
54// We need to keep this in order for unittests to tell if
55// the object in gfx::Screen::GetScreenByType is for shutdown.
56gfx::Screen* screen_for_shutdown = NULL;
57
58// The number of pixels to overlap between the primary and secondary displays,
59// in case that the offset value is too large.
60const int kMinimumOverlapForInvalidOffset = 100;
61
62// List of value UI Scale values. Scales for 2x are equivalent to 640,
63// 800, 1024, 1280, 1440, 1600 and 1920 pixel width respectively on
64// 2560 pixel width 2x density display. Please see crbug.com/233375
65// for the full list of resolutions.
66const float kUIScalesFor2x[] =
67    {0.5f, 0.625f, 0.8f, 1.0f, 1.125f, 1.25f, 1.5f, 2.0f};
68const float kUIScalesFor1_25x[] = {0.5f, 0.625f, 0.8f, 1.0f, 1.25f };
69const float kUIScalesFor1280[] = {0.5f, 0.625f, 0.8f, 1.0f, 1.125f };
70const float kUIScalesFor1366[] = {0.5f, 0.6f, 0.75f, 1.0f, 1.125f };
71
72struct DisplaySortFunctor {
73  bool operator()(const gfx::Display& a, const gfx::Display& b) {
74    return a.id() < b.id();
75  }
76};
77
78struct DisplayInfoSortFunctor {
79  bool operator()(const DisplayInfo& a, const DisplayInfo& b) {
80    return a.id() < b.id();
81  }
82};
83
84struct DisplayModeMatcher {
85  DisplayModeMatcher(const DisplayMode& target_mode)
86      : target_mode(target_mode) {}
87  bool operator()(const DisplayMode& mode) {
88    return target_mode.IsEquivalent(mode);
89  }
90  DisplayMode target_mode;
91};
92
93struct ScaleComparator {
94  explicit ScaleComparator(float s) : scale(s) {}
95
96  bool operator()(float s) const {
97    const float kEpsilon = 0.0001f;
98    return std::abs(scale - s) < kEpsilon;
99  }
100  float scale;
101};
102
103gfx::Display& GetInvalidDisplay() {
104  static gfx::Display* invalid_display = new gfx::Display();
105  return *invalid_display;
106}
107
108void MaybeInitInternalDisplay(int64 id) {
109  CommandLine* command_line = CommandLine::ForCurrentProcess();
110  if (command_line->HasSwitch(switches::kAshUseFirstDisplayAsInternal))
111    gfx::Display::SetInternalDisplayId(id);
112}
113
114// Scoped objects used to either create or close the non desktop window
115// at specific timing.
116class NonDesktopDisplayUpdater {
117 public:
118  NonDesktopDisplayUpdater(DisplayManager* manager,
119                           DisplayManager::Delegate* delegate)
120      : manager_(manager),
121        delegate_(delegate),
122        enabled_(manager_->second_display_mode() != DisplayManager::EXTENDED &&
123                 manager_->non_desktop_display().is_valid()) {
124  }
125
126  ~NonDesktopDisplayUpdater() {
127    if (!delegate_)
128      return;
129
130    if (enabled_) {
131      DisplayInfo display_info = manager_->GetDisplayInfo(
132          manager_->non_desktop_display().id());
133      delegate_->CreateOrUpdateNonDesktopDisplay(display_info);
134    } else {
135      delegate_->CloseNonDesktopDisplay();
136    }
137  }
138
139  bool enabled() const { return enabled_; }
140
141 private:
142  DisplayManager* manager_;
143  DisplayManager::Delegate* delegate_;
144  bool enabled_;
145  DISALLOW_COPY_AND_ASSIGN(NonDesktopDisplayUpdater);
146};
147
148}  // namespace
149
150using std::string;
151using std::vector;
152
153DisplayManager::DisplayManager()
154    : delegate_(NULL),
155      screen_ash_(new ScreenAsh),
156      screen_(screen_ash_.get()),
157      layout_store_(new DisplayLayoutStore),
158      first_display_id_(gfx::Display::kInvalidDisplayID),
159      num_connected_displays_(0),
160      force_bounds_changed_(false),
161      change_display_upon_host_resize_(false),
162      second_display_mode_(EXTENDED),
163      mirrored_display_id_(gfx::Display::kInvalidDisplayID),
164      registered_internal_display_rotation_lock_(false),
165      registered_internal_display_rotation_(gfx::Display::ROTATE_0) {
166
167#if defined(OS_CHROMEOS)
168  // Enable only on the device so that DisplayManagerFontTest passes.
169  if (base::SysInfo::IsRunningOnChromeOS())
170    DisplayInfo::SetUse125DSFForUIScaling(true);
171
172  change_display_upon_host_resize_ = !base::SysInfo::IsRunningOnChromeOS();
173#endif
174  gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_ALTERNATE,
175                                 screen_ash_.get());
176  gfx::Screen* current_native =
177      gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_NATIVE);
178  // If there is no native, or the native was for shutdown,
179  // use ash's screen.
180  if (!current_native ||
181      current_native == screen_for_shutdown) {
182    gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE,
183                                   screen_ash_.get());
184  }
185}
186
187DisplayManager::~DisplayManager() {
188#if defined(OS_CHROMEOS)
189  // Reset the font params.
190  gfx::SetFontRenderParamsDeviceScaleFactor(1.0f);
191#endif
192}
193
194// static
195std::vector<float> DisplayManager::GetScalesForDisplay(
196    const DisplayInfo& info) {
197
198#define ASSIGN_ARRAY(v, a) v.assign(a, a + arraysize(a))
199
200  std::vector<float> ret;
201  if (info.device_scale_factor() == 2.0f) {
202    ASSIGN_ARRAY(ret, kUIScalesFor2x);
203    return ret;
204  } else if (info.device_scale_factor() == 1.25f) {
205    ASSIGN_ARRAY(ret, kUIScalesFor1_25x);
206    return ret;
207  }
208  switch (info.bounds_in_native().width()) {
209    case 1280:
210      ASSIGN_ARRAY(ret, kUIScalesFor1280);
211      break;
212    case 1366:
213      ASSIGN_ARRAY(ret, kUIScalesFor1366);
214      break;
215    default:
216      ASSIGN_ARRAY(ret, kUIScalesFor1280);
217#if defined(OS_CHROMEOS)
218      if (base::SysInfo::IsRunningOnChromeOS())
219        NOTREACHED() << "Unknown resolution:" << info.ToString();
220#endif
221  }
222  return ret;
223}
224
225// static
226float DisplayManager::GetNextUIScale(const DisplayInfo& info, bool up) {
227  float scale = info.configured_ui_scale();
228  std::vector<float> scales = GetScalesForDisplay(info);
229  for (size_t i = 0; i < scales.size(); ++i) {
230    if (ScaleComparator(scales[i])(scale)) {
231      if (up && i != scales.size() - 1)
232        return scales[i + 1];
233      if (!up && i != 0)
234        return scales[i - 1];
235      return scales[i];
236    }
237  }
238  // Fallback to 1.0f if the |scale| wasn't in the list.
239  return 1.0f;
240}
241
242bool DisplayManager::InitFromCommandLine() {
243  DisplayInfoList info_list;
244  CommandLine* command_line = CommandLine::ForCurrentProcess();
245  if (!command_line->HasSwitch(switches::kAshHostWindowBounds))
246    return false;
247  const string size_str =
248      command_line->GetSwitchValueASCII(switches::kAshHostWindowBounds);
249  vector<string> parts;
250  base::SplitString(size_str, ',', &parts);
251  for (vector<string>::const_iterator iter = parts.begin();
252       iter != parts.end(); ++iter) {
253    info_list.push_back(DisplayInfo::CreateFromSpec(*iter));
254    info_list.back().set_native(true);
255  }
256  MaybeInitInternalDisplay(info_list[0].id());
257  if (info_list.size() > 1 &&
258      command_line->HasSwitch(switches::kAshEnableSoftwareMirroring)) {
259    SetSecondDisplayMode(MIRRORING);
260  }
261  OnNativeDisplaysChanged(info_list);
262  return true;
263}
264
265void DisplayManager::InitDefaultDisplay() {
266  DisplayInfoList info_list;
267  info_list.push_back(DisplayInfo::CreateFromSpec(std::string()));
268  info_list.back().set_native(true);
269  MaybeInitInternalDisplay(info_list[0].id());
270  OnNativeDisplaysChanged(info_list);
271}
272
273void DisplayManager::InitFontParams() {
274#if defined(OS_CHROMEOS)
275  if (!HasInternalDisplay())
276    return;
277  const DisplayInfo& display_info =
278      GetDisplayInfo(gfx::Display::InternalDisplayId());
279  gfx::SetFontRenderParamsDeviceScaleFactor(
280      display_info.GetEffectiveDeviceScaleFactor());
281#endif  // OS_CHROMEOS
282}
283
284// static
285void DisplayManager::UpdateDisplayBoundsForLayoutById(
286    const DisplayLayout& layout,
287    const gfx::Display& primary_display,
288    int64 secondary_display_id) {
289  DCHECK_NE(gfx::Display::kInvalidDisplayID, secondary_display_id);
290  UpdateDisplayBoundsForLayout(
291      layout, primary_display,
292      Shell::GetInstance()->display_manager()->
293      FindDisplayForId(secondary_display_id));
294}
295
296bool DisplayManager::IsActiveDisplay(const gfx::Display& display) const {
297  for (DisplayList::const_iterator iter = displays_.begin();
298       iter != displays_.end(); ++iter) {
299    if ((*iter).id() == display.id())
300      return true;
301  }
302  return false;
303}
304
305bool DisplayManager::HasInternalDisplay() const {
306  return gfx::Display::InternalDisplayId() != gfx::Display::kInvalidDisplayID;
307}
308
309bool DisplayManager::IsInternalDisplayId(int64 id) const {
310  return gfx::Display::InternalDisplayId() == id;
311}
312
313DisplayLayout DisplayManager::GetCurrentDisplayLayout() {
314  DCHECK_EQ(2U, num_connected_displays());
315  // Invert if the primary was swapped.
316  if (num_connected_displays() > 1) {
317    DisplayIdPair pair = GetCurrentDisplayIdPair();
318    return layout_store_->ComputeDisplayLayoutForDisplayIdPair(pair);
319  }
320  NOTREACHED() << "DisplayLayout is requested for single display";
321  // On release build, just fallback to default instead of blowing up.
322  DisplayLayout layout =
323      layout_store_->default_display_layout();
324  layout.primary_id = displays_[0].id();
325  return layout;
326}
327
328DisplayIdPair DisplayManager::GetCurrentDisplayIdPair() const {
329  if (IsMirrored()) {
330    if (software_mirroring_enabled()) {
331      CHECK_EQ(2u, num_connected_displays());
332      // This comment is to make it easy to distinguish the crash
333      // between two checks.
334      CHECK_EQ(1u, displays_.size());
335    }
336    return std::make_pair(displays_[0].id(), mirrored_display_id_);
337  } else {
338    CHECK_GE(2u, displays_.size());
339    int64 id_at_zero = displays_[0].id();
340    if (id_at_zero == gfx::Display::InternalDisplayId() ||
341        id_at_zero == first_display_id()) {
342      return std::make_pair(id_at_zero, displays_[1].id());
343    } else {
344      return std::make_pair(displays_[1].id(), id_at_zero);
345    }
346  }
347}
348
349void DisplayManager::SetLayoutForCurrentDisplays(
350    const DisplayLayout& layout_relative_to_primary) {
351  DCHECK_EQ(2U, GetNumDisplays());
352  if (GetNumDisplays() < 2)
353    return;
354  const gfx::Display& primary = screen_->GetPrimaryDisplay();
355  const DisplayIdPair pair = GetCurrentDisplayIdPair();
356  // Invert if the primary was swapped.
357  DisplayLayout to_set = pair.first == primary.id() ?
358      layout_relative_to_primary : layout_relative_to_primary.Invert();
359
360  DisplayLayout current_layout =
361      layout_store_->GetRegisteredDisplayLayout(pair);
362  if (to_set.position != current_layout.position ||
363      to_set.offset != current_layout.offset) {
364    to_set.primary_id = primary.id();
365    layout_store_->RegisterLayoutForDisplayIdPair(
366        pair.first, pair.second, to_set);
367    if (delegate_)
368      delegate_->PreDisplayConfigurationChange(false);
369    // PreDisplayConfigurationChange(false);
370    // TODO(oshima): Call UpdateDisplays instead.
371    const DisplayLayout layout = GetCurrentDisplayLayout();
372    UpdateDisplayBoundsForLayoutById(
373        layout, primary,
374        ScreenUtil::GetSecondaryDisplay().id());
375
376    // Primary's bounds stay the same. Just notify bounds change
377    // on the secondary.
378    screen_ash_->NotifyMetricsChanged(
379        ScreenUtil::GetSecondaryDisplay(),
380        gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS |
381            gfx::DisplayObserver::DISPLAY_METRIC_WORK_AREA);
382    if (delegate_)
383      delegate_->PostDisplayConfigurationChange();
384  }
385}
386
387const gfx::Display& DisplayManager::GetDisplayForId(int64 id) const {
388  gfx::Display* display =
389      const_cast<DisplayManager*>(this)->FindDisplayForId(id);
390  return display ? *display : GetInvalidDisplay();
391}
392
393const gfx::Display& DisplayManager::FindDisplayContainingPoint(
394    const gfx::Point& point_in_screen) const {
395  for (DisplayList::const_iterator iter = displays_.begin();
396       iter != displays_.end(); ++iter) {
397    const gfx::Display& display = *iter;
398    if (display.bounds().Contains(point_in_screen))
399      return display;
400  }
401  return GetInvalidDisplay();
402}
403
404bool DisplayManager::UpdateWorkAreaOfDisplay(int64 display_id,
405                                             const gfx::Insets& insets) {
406  gfx::Display* display = FindDisplayForId(display_id);
407  DCHECK(display);
408  gfx::Rect old_work_area = display->work_area();
409  display->UpdateWorkAreaFromInsets(insets);
410  return old_work_area != display->work_area();
411}
412
413void DisplayManager::SetOverscanInsets(int64 display_id,
414                                       const gfx::Insets& insets_in_dip) {
415  display_info_[display_id].SetOverscanInsets(insets_in_dip);
416  DisplayInfoList display_info_list;
417  for (DisplayList::const_iterator iter = displays_.begin();
418       iter != displays_.end(); ++iter) {
419    display_info_list.push_back(GetDisplayInfo(iter->id()));
420  }
421  AddMirrorDisplayInfoIfAny(&display_info_list);
422  UpdateDisplays(display_info_list);
423}
424
425void DisplayManager::SetDisplayRotation(int64 display_id,
426                                        gfx::Display::Rotation rotation) {
427  DisplayInfoList display_info_list;
428  for (DisplayList::const_iterator iter = displays_.begin();
429       iter != displays_.end(); ++iter) {
430    DisplayInfo info = GetDisplayInfo(iter->id());
431    if (info.id() == display_id) {
432      if (info.rotation() == rotation)
433        return;
434      info.set_rotation(rotation);
435    }
436    display_info_list.push_back(info);
437  }
438  AddMirrorDisplayInfoIfAny(&display_info_list);
439  UpdateDisplays(display_info_list);
440}
441
442void DisplayManager::SetDisplayUIScale(int64 display_id,
443                                       float ui_scale) {
444  if (!IsDisplayUIScalingEnabled() ||
445      gfx::Display::InternalDisplayId() != display_id) {
446    return;
447  }
448
449  // TODO(mukai): merge this implementation into SetDisplayMode().
450  DisplayInfoList display_info_list;
451  for (DisplayList::const_iterator iter = displays_.begin();
452       iter != displays_.end(); ++iter) {
453    DisplayInfo info = GetDisplayInfo(iter->id());
454    if (info.id() == display_id) {
455      if (info.configured_ui_scale() == ui_scale)
456        return;
457      std::vector<float> scales = GetScalesForDisplay(info);
458      ScaleComparator comparator(ui_scale);
459      if (std::find_if(scales.begin(), scales.end(), comparator) ==
460          scales.end()) {
461        return;
462      }
463      info.set_configured_ui_scale(ui_scale);
464    }
465    display_info_list.push_back(info);
466  }
467  AddMirrorDisplayInfoIfAny(&display_info_list);
468  UpdateDisplays(display_info_list);
469}
470
471void DisplayManager::SetDisplayResolution(int64 display_id,
472                                          const gfx::Size& resolution) {
473  DCHECK_NE(gfx::Display::InternalDisplayId(), display_id);
474  if (gfx::Display::InternalDisplayId() == display_id)
475    return;
476  const DisplayInfo& display_info = GetDisplayInfo(display_id);
477  const std::vector<DisplayMode>& modes = display_info.display_modes();
478  DCHECK_NE(0u, modes.size());
479  DisplayMode target_mode;
480  target_mode.size = resolution;
481  std::vector<DisplayMode>::const_iterator iter =
482      std::find_if(modes.begin(), modes.end(), DisplayModeMatcher(target_mode));
483  if (iter == modes.end()) {
484    LOG(WARNING) << "Unsupported resolution was requested:"
485                 << resolution.ToString();
486    return;
487  }
488  display_modes_[display_id] = *iter;
489#if defined(OS_CHROMEOS)
490  if (base::SysInfo::IsRunningOnChromeOS())
491    Shell::GetInstance()->display_configurator()->OnConfigurationChanged();
492#endif
493}
494
495bool DisplayManager::SetDisplayMode(int64 display_id,
496                                    const DisplayMode& display_mode) {
497  if (IsInternalDisplayId(display_id)) {
498    SetDisplayUIScale(display_id, display_mode.ui_scale);
499    return false;
500  }
501
502  DisplayInfoList display_info_list;
503  bool display_property_changed = false;
504  bool resolution_changed = false;
505  for (DisplayList::const_iterator iter = displays_.begin();
506       iter != displays_.end(); ++iter) {
507    DisplayInfo info = GetDisplayInfo(iter->id());
508    if (info.id() == display_id) {
509      const std::vector<DisplayMode>& modes = info.display_modes();
510      std::vector<DisplayMode>::const_iterator iter =
511          std::find_if(modes.begin(),
512                       modes.end(),
513                       DisplayModeMatcher(display_mode));
514      if (iter == modes.end()) {
515        LOG(WARNING) << "Unsupported resolution was requested:"
516                     << display_mode.size.ToString();
517        return false;
518      }
519      display_modes_[display_id] = *iter;
520      if (info.bounds_in_native().size() != display_mode.size)
521        resolution_changed = true;
522      if (info.device_scale_factor() != display_mode.device_scale_factor) {
523        info.set_device_scale_factor(display_mode.device_scale_factor);
524        display_property_changed = true;
525      }
526    }
527    display_info_list.push_back(info);
528  }
529  if (display_property_changed) {
530    AddMirrorDisplayInfoIfAny(&display_info_list);
531    UpdateDisplays(display_info_list);
532  }
533#if defined(OS_CHROMEOS)
534  if (resolution_changed && base::SysInfo::IsRunningOnChromeOS())
535    Shell::GetInstance()->display_configurator()->OnConfigurationChanged();
536#endif
537  return resolution_changed;
538}
539
540void DisplayManager::RegisterDisplayProperty(
541    int64 display_id,
542    gfx::Display::Rotation rotation,
543    float ui_scale,
544    const gfx::Insets* overscan_insets,
545    const gfx::Size& resolution_in_pixels,
546    float device_scale_factor,
547    ui::ColorCalibrationProfile color_profile) {
548  if (display_info_.find(display_id) == display_info_.end())
549    display_info_[display_id] = DisplayInfo(display_id, std::string(), false);
550
551  display_info_[display_id].set_rotation(rotation);
552  display_info_[display_id].SetColorProfile(color_profile);
553  // Just in case the preference file was corrupted.
554  // TODO(mukai): register |display_modes_| here as well, so the lookup for the
555  // default mode in GetActiveModeForDisplayId() gets much simpler.
556  if (0.5f <= ui_scale && ui_scale <= 2.0f)
557    display_info_[display_id].set_configured_ui_scale(ui_scale);
558  if (overscan_insets)
559    display_info_[display_id].SetOverscanInsets(*overscan_insets);
560  if (!resolution_in_pixels.IsEmpty()) {
561    DCHECK(!IsInternalDisplayId(display_id));
562    // Default refresh rate, until OnNativeDisplaysChanged() updates us with the
563    // actual display info, is 60 Hz.
564    DisplayMode mode(resolution_in_pixels, 60.0f, false, false);
565    mode.device_scale_factor = device_scale_factor;
566    display_modes_[display_id] = mode;
567  }
568}
569
570DisplayMode DisplayManager::GetActiveModeForDisplayId(int64 display_id) const {
571  DisplayMode selected_mode;
572  if (GetSelectedModeForDisplayId(display_id, &selected_mode))
573    return selected_mode;
574
575  // If 'selected' mode is empty, it should return the default mode. This means
576  // the native mode for the external display. Unfortunately this is not true
577  // for the internal display because restoring UI-scale doesn't register the
578  // restored mode to |display_mode_|, so it needs to look up the mode whose
579  // UI-scale value matches. See the TODO in RegisterDisplayProperty().
580  const DisplayInfo& info = GetDisplayInfo(display_id);
581  const std::vector<DisplayMode>& display_modes = info.display_modes();
582
583  if (IsInternalDisplayId(display_id)) {
584    for (size_t i = 0; i < display_modes.size(); ++i) {
585      if (info.configured_ui_scale() == display_modes[i].ui_scale)
586        return display_modes[i];
587    }
588  } else {
589    for (size_t i = 0; i < display_modes.size(); ++i) {
590      if (display_modes[i].native)
591        return display_modes[i];
592    }
593  }
594  return selected_mode;
595}
596
597void DisplayManager::RegisterDisplayRotationProperties(bool rotation_lock,
598    gfx::Display::Rotation rotation) {
599  if (delegate_)
600    delegate_->PreDisplayConfigurationChange(false);
601  registered_internal_display_rotation_lock_ = rotation_lock;
602  registered_internal_display_rotation_ = rotation;
603  if (delegate_)
604    delegate_->PostDisplayConfigurationChange();
605}
606
607bool DisplayManager::GetSelectedModeForDisplayId(int64 id,
608                                                 DisplayMode* mode_out) const {
609  std::map<int64, DisplayMode>::const_iterator iter = display_modes_.find(id);
610  if (iter == display_modes_.end())
611    return false;
612  *mode_out = iter->second;
613  return true;
614}
615
616bool DisplayManager::IsDisplayUIScalingEnabled() const {
617  return GetDisplayIdForUIScaling() != gfx::Display::kInvalidDisplayID;
618}
619
620gfx::Insets DisplayManager::GetOverscanInsets(int64 display_id) const {
621  std::map<int64, DisplayInfo>::const_iterator it =
622      display_info_.find(display_id);
623  return (it != display_info_.end()) ?
624      it->second.overscan_insets_in_dip() : gfx::Insets();
625}
626
627void DisplayManager::SetColorCalibrationProfile(
628    int64 display_id,
629    ui::ColorCalibrationProfile profile) {
630#if defined(OS_CHROMEOS)
631  if (!display_info_[display_id].IsColorProfileAvailable(profile))
632    return;
633
634  if (delegate_)
635    delegate_->PreDisplayConfigurationChange(false);
636  // Just sets color profile if it's not running on ChromeOS (like tests).
637  if (!base::SysInfo::IsRunningOnChromeOS() ||
638      Shell::GetInstance()->display_configurator()->SetColorCalibrationProfile(
639          display_id, profile)) {
640    display_info_[display_id].SetColorProfile(profile);
641    UMA_HISTOGRAM_ENUMERATION(
642        "ChromeOS.Display.ColorProfile", profile, ui::NUM_COLOR_PROFILES);
643  }
644  if (delegate_)
645    delegate_->PostDisplayConfigurationChange();
646#endif
647}
648
649void DisplayManager::OnNativeDisplaysChanged(
650    const std::vector<DisplayInfo>& updated_displays) {
651  if (updated_displays.empty()) {
652    VLOG(1) << "OnNativeDisplaysChanged(0): # of current displays="
653            << displays_.size();
654    // If the device is booted without display, or chrome is started
655    // without --ash-host-window-bounds on linux desktop, use the
656    // default display.
657    if (displays_.empty()) {
658      std::vector<DisplayInfo> init_displays;
659      init_displays.push_back(DisplayInfo::CreateFromSpec(std::string()));
660      MaybeInitInternalDisplay(init_displays[0].id());
661      OnNativeDisplaysChanged(init_displays);
662    } else {
663      // Otherwise don't update the displays when all displays are disconnected.
664      // This happens when:
665      // - the device is idle and powerd requested to turn off all displays.
666      // - the device is suspended. (kernel turns off all displays)
667      // - the internal display's brightness is set to 0 and no external
668      //   display is connected.
669      // - the internal display's brightness is 0 and external display is
670      //   disconnected.
671      // The display will be updated when one of displays is turned on, and the
672      // display list will be updated correctly.
673    }
674    return;
675  }
676  first_display_id_ = updated_displays[0].id();
677  std::set<gfx::Point> origins;
678
679  if (updated_displays.size() == 1) {
680    VLOG(1) << "OnNativeDisplaysChanged(1):" << updated_displays[0].ToString();
681  } else {
682    VLOG(1) << "OnNativeDisplaysChanged(" << updated_displays.size()
683            << ") [0]=" << updated_displays[0].ToString()
684            << ", [1]=" << updated_displays[1].ToString();
685  }
686
687  bool internal_display_connected = false;
688  num_connected_displays_ = updated_displays.size();
689  mirrored_display_id_ = gfx::Display::kInvalidDisplayID;
690  non_desktop_display_ = gfx::Display();
691  DisplayInfoList new_display_info_list;
692  for (DisplayInfoList::const_iterator iter = updated_displays.begin();
693       iter != updated_displays.end();
694       ++iter) {
695    if (!internal_display_connected)
696      internal_display_connected = IsInternalDisplayId(iter->id());
697    // Mirrored monitors have the same origins.
698    gfx::Point origin = iter->bounds_in_native().origin();
699    if (origins.find(origin) != origins.end()) {
700      InsertAndUpdateDisplayInfo(*iter);
701      mirrored_display_id_ = iter->id();
702    } else {
703      origins.insert(origin);
704      new_display_info_list.push_back(*iter);
705    }
706
707    DisplayMode new_mode;
708    new_mode.size = iter->bounds_in_native().size();
709    new_mode.device_scale_factor = iter->device_scale_factor();
710    new_mode.ui_scale = iter->configured_ui_scale();
711    const std::vector<DisplayMode>& display_modes = iter->display_modes();
712    // This is empty the displays are initialized from InitFromCommandLine.
713    if (!display_modes.size())
714      continue;
715    std::vector<DisplayMode>::const_iterator display_modes_iter =
716        std::find_if(display_modes.begin(),
717                     display_modes.end(),
718                     DisplayModeMatcher(new_mode));
719    // Update the actual resolution selected as the resolution request may fail.
720    if (display_modes_iter == display_modes.end())
721      display_modes_.erase(iter->id());
722    else if (display_modes_.find(iter->id()) != display_modes_.end())
723      display_modes_[iter->id()] = *display_modes_iter;
724  }
725  if (HasInternalDisplay() &&
726      !internal_display_connected &&
727      display_info_.find(gfx::Display::InternalDisplayId()) ==
728      display_info_.end()) {
729    DisplayInfo internal_display_info(
730        gfx::Display::InternalDisplayId(),
731        l10n_util::GetStringUTF8(IDS_ASH_INTERNAL_DISPLAY_NAME),
732        false  /*Internal display must not have overscan */);
733    internal_display_info.SetBounds(gfx::Rect(0, 0, 800, 600));
734    display_info_[gfx::Display::InternalDisplayId()] = internal_display_info;
735  }
736  UpdateDisplays(new_display_info_list);
737}
738
739void DisplayManager::UpdateDisplays() {
740  DisplayInfoList display_info_list;
741  for (DisplayList::const_iterator iter = displays_.begin();
742       iter != displays_.end(); ++iter) {
743    display_info_list.push_back(GetDisplayInfo(iter->id()));
744  }
745  AddMirrorDisplayInfoIfAny(&display_info_list);
746  UpdateDisplays(display_info_list);
747}
748
749void DisplayManager::UpdateDisplays(
750    const std::vector<DisplayInfo>& updated_display_info_list) {
751#if defined(OS_WIN)
752  DCHECK_EQ(1u, updated_display_info_list.size()) <<
753      ": Multiple display test does not work on Windows bots. Please "
754      "skip (don't disable) the test using SupportsMultipleDisplays()";
755#endif
756
757  DisplayInfoList new_display_info_list = updated_display_info_list;
758  std::sort(displays_.begin(), displays_.end(), DisplaySortFunctor());
759  std::sort(new_display_info_list.begin(),
760            new_display_info_list.end(),
761            DisplayInfoSortFunctor());
762  DisplayList removed_displays;
763  std::map<size_t, uint32_t> display_changes;
764  std::vector<size_t> added_display_indices;
765
766  DisplayList::iterator curr_iter = displays_.begin();
767  DisplayInfoList::const_iterator new_info_iter = new_display_info_list.begin();
768
769  DisplayList new_displays;
770
771  // Use the internal display or 1st as the mirror source, then scale
772  // the root window so that it matches the external display's
773  // resolution. This is necessary in order for scaling to work while
774  // mirrored.
775  int64 non_desktop_display_id = gfx::Display::kInvalidDisplayID;
776
777  if (second_display_mode_ != EXTENDED && new_display_info_list.size() == 2) {
778    bool zero_is_source =
779        first_display_id_ == new_display_info_list[0].id() ||
780        gfx::Display::InternalDisplayId() == new_display_info_list[0].id();
781    if (second_display_mode_ == MIRRORING) {
782      mirrored_display_id_ = new_display_info_list[zero_is_source ? 1 : 0].id();
783      non_desktop_display_id = mirrored_display_id_;
784    } else {
785      // TODO(oshima|bshe): The virtual keyboard is currently assigned to
786      // the 1st display.
787      non_desktop_display_id =
788          new_display_info_list[zero_is_source ? 0 : 1].id();
789    }
790  }
791
792  while (curr_iter != displays_.end() ||
793         new_info_iter != new_display_info_list.end()) {
794    if (new_info_iter != new_display_info_list.end() &&
795        non_desktop_display_id == new_info_iter->id()) {
796      DisplayInfo info = *new_info_iter;
797      info.SetOverscanInsets(gfx::Insets());
798      InsertAndUpdateDisplayInfo(info);
799      non_desktop_display_ =
800          CreateDisplayFromDisplayInfoById(non_desktop_display_id);
801      ++new_info_iter;
802      // Remove existing external display if it is going to be used as
803      // non desktop.
804      if (curr_iter != displays_.end() &&
805          curr_iter->id() == non_desktop_display_id) {
806        removed_displays.push_back(*curr_iter);
807        ++curr_iter;
808      }
809      continue;
810    }
811
812    if (curr_iter == displays_.end()) {
813      // more displays in new list.
814      added_display_indices.push_back(new_displays.size());
815      InsertAndUpdateDisplayInfo(*new_info_iter);
816      new_displays.push_back(
817          CreateDisplayFromDisplayInfoById(new_info_iter->id()));
818      ++new_info_iter;
819    } else if (new_info_iter == new_display_info_list.end()) {
820      // more displays in current list.
821      removed_displays.push_back(*curr_iter);
822      ++curr_iter;
823    } else if (curr_iter->id() == new_info_iter->id()) {
824      const gfx::Display& current_display = *curr_iter;
825      // Copy the info because |CreateDisplayFromInfo| updates the instance.
826      const DisplayInfo current_display_info =
827          GetDisplayInfo(current_display.id());
828      InsertAndUpdateDisplayInfo(*new_info_iter);
829      gfx::Display new_display =
830          CreateDisplayFromDisplayInfoById(new_info_iter->id());
831      const DisplayInfo& new_display_info = GetDisplayInfo(new_display.id());
832
833      uint32_t metrics = gfx::DisplayObserver::DISPLAY_METRIC_NONE;
834
835      // At that point the new Display objects we have are not entirely updated,
836      // they are missing the translation related to the Display disposition in
837      // the layout.
838      // Using display.bounds() and display.work_area() would fail most of the
839      // time.
840      if (force_bounds_changed_ || (current_display_info.bounds_in_native() !=
841                                    new_display_info.bounds_in_native()) ||
842          (current_display_info.size_in_pixel() !=
843           new_display.GetSizeInPixel())) {
844        metrics |= gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS |
845                   gfx::DisplayObserver::DISPLAY_METRIC_WORK_AREA;
846      }
847
848      if (current_display.device_scale_factor() !=
849          new_display.device_scale_factor()) {
850        metrics |= gfx::DisplayObserver::DISPLAY_METRIC_DEVICE_SCALE_FACTOR;
851      }
852
853      if (current_display.rotation() != new_display.rotation())
854        metrics |= gfx::DisplayObserver::DISPLAY_METRIC_ROTATION;
855
856      if (metrics != gfx::DisplayObserver::DISPLAY_METRIC_NONE) {
857        display_changes.insert(
858            std::pair<size_t, uint32_t>(new_displays.size(), metrics));
859      }
860
861      new_display.UpdateWorkAreaFromInsets(current_display.GetWorkAreaInsets());
862      new_displays.push_back(new_display);
863      ++curr_iter;
864      ++new_info_iter;
865    } else if (curr_iter->id() < new_info_iter->id()) {
866      // more displays in current list between ids, which means it is deleted.
867      removed_displays.push_back(*curr_iter);
868      ++curr_iter;
869    } else {
870      // more displays in new list between ids, which means it is added.
871      added_display_indices.push_back(new_displays.size());
872      InsertAndUpdateDisplayInfo(*new_info_iter);
873      new_displays.push_back(
874          CreateDisplayFromDisplayInfoById(new_info_iter->id()));
875      ++new_info_iter;
876    }
877  }
878
879  scoped_ptr<NonDesktopDisplayUpdater> non_desktop_display_updater(
880      new NonDesktopDisplayUpdater(this, delegate_));
881
882  // Clear focus if the display has been removed, but don't clear focus if
883  // the destkop has been moved from one display to another
884  // (mirror -> docked, docked -> single internal).
885  bool clear_focus =
886      !removed_displays.empty() &&
887      !(removed_displays.size() == 1 && added_display_indices.size() == 1);
888  if (delegate_)
889    delegate_->PreDisplayConfigurationChange(clear_focus);
890
891  // Do not update |displays_| if there's nothing to be updated. Without this,
892  // it will not update the display layout, which causes the bug
893  // http://crbug.com/155948.
894  if (display_changes.empty() && added_display_indices.empty() &&
895      removed_displays.empty()) {
896    // When changing from software mirroring mode to sinlge display mode, it
897    // is possible there is no need to update |displays_| and we early out
898    // here. But we still want to run the PostDisplayConfigurationChange()
899    // cause there are some clients need to act on this, e.g.
900    // TouchTransformerController needs to adjust the TouchTransformer when
901    // switching from dual displays to single display.
902    if (delegate_)
903      delegate_->PostDisplayConfigurationChange();
904    return;
905  }
906
907  size_t updated_index;
908  if (UpdateSecondaryDisplayBoundsForLayout(&new_displays, &updated_index) &&
909      std::find(added_display_indices.begin(),
910                added_display_indices.end(),
911                updated_index) == added_display_indices.end()) {
912    uint32_t metrics = gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS |
913                       gfx::DisplayObserver::DISPLAY_METRIC_WORK_AREA;
914    if (display_changes.find(updated_index) != display_changes.end())
915      metrics |= display_changes[updated_index];
916
917    display_changes[updated_index] = metrics;
918  }
919
920  displays_ = new_displays;
921
922  base::AutoReset<bool> resetter(&change_display_upon_host_resize_, false);
923
924  // Temporarily add displays to be removed because display object
925  // being removed are accessed during shutting down the root.
926  displays_.insert(displays_.end(), removed_displays.begin(),
927                   removed_displays.end());
928
929  for (DisplayList::const_reverse_iterator iter = removed_displays.rbegin();
930       iter != removed_displays.rend(); ++iter) {
931    screen_ash_->NotifyDisplayRemoved(displays_.back());
932    displays_.pop_back();
933  }
934  // Close the non desktop window here to avoid creating two compositor on
935  // one display.
936  if (!non_desktop_display_updater->enabled())
937    non_desktop_display_updater.reset();
938  for (std::vector<size_t>::iterator iter = added_display_indices.begin();
939       iter != added_display_indices.end(); ++iter) {
940    screen_ash_->NotifyDisplayAdded(displays_[*iter]);
941  }
942  // Create the non destkop window after all displays are added so that
943  // it can mirror the display newly added. This can happen when switching
944  // from dock mode to software mirror mode.
945  non_desktop_display_updater.reset();
946  for (std::map<size_t, uint32_t>::iterator iter = display_changes.begin();
947       iter != display_changes.end();
948       ++iter) {
949    screen_ash_->NotifyMetricsChanged(displays_[iter->first], iter->second);
950  }
951  if (delegate_)
952    delegate_->PostDisplayConfigurationChange();
953
954#if defined(USE_X11) && defined(OS_CHROMEOS)
955  if (!display_changes.empty() && base::SysInfo::IsRunningOnChromeOS())
956    ui::ClearX11DefaultRootWindow();
957#endif
958}
959
960const gfx::Display& DisplayManager::GetDisplayAt(size_t index) const {
961  DCHECK_LT(index, displays_.size());
962  return displays_[index];
963}
964
965const gfx::Display& DisplayManager::GetPrimaryDisplayCandidate() const {
966  if (GetNumDisplays() == 1)
967    return displays_[0];
968  DisplayLayout layout = layout_store_->GetRegisteredDisplayLayout(
969      GetCurrentDisplayIdPair());
970  return GetDisplayForId(layout.primary_id);
971}
972
973size_t DisplayManager::GetNumDisplays() const {
974  return displays_.size();
975}
976
977bool DisplayManager::IsMirrored() const {
978  return mirrored_display_id_ != gfx::Display::kInvalidDisplayID;
979}
980
981const DisplayInfo& DisplayManager::GetDisplayInfo(int64 display_id) const {
982  DCHECK_NE(gfx::Display::kInvalidDisplayID, display_id);
983
984  std::map<int64, DisplayInfo>::const_iterator iter =
985      display_info_.find(display_id);
986  CHECK(iter != display_info_.end()) << display_id;
987  return iter->second;
988}
989
990std::string DisplayManager::GetDisplayNameForId(int64 id) {
991  if (id == gfx::Display::kInvalidDisplayID)
992    return l10n_util::GetStringUTF8(IDS_ASH_STATUS_TRAY_UNKNOWN_DISPLAY_NAME);
993
994  std::map<int64, DisplayInfo>::const_iterator iter = display_info_.find(id);
995  if (iter != display_info_.end() && !iter->second.name().empty())
996    return iter->second.name();
997
998  return base::StringPrintf("Display %d", static_cast<int>(id));
999}
1000
1001int64 DisplayManager::GetDisplayIdForUIScaling() const {
1002  // UI Scaling is effective only on internal display.
1003  int64 display_id = gfx::Display::InternalDisplayId();
1004#if defined(OS_WIN)
1005  display_id = first_display_id();
1006#endif
1007  return display_id;
1008}
1009
1010void DisplayManager::SetMirrorMode(bool mirrored) {
1011  if (num_connected_displays() <= 1)
1012    return;
1013
1014#if defined(OS_CHROMEOS)
1015  if (base::SysInfo::IsRunningOnChromeOS()) {
1016    ui::MultipleDisplayState new_state =
1017        mirrored ? ui::MULTIPLE_DISPLAY_STATE_DUAL_MIRROR :
1018                   ui::MULTIPLE_DISPLAY_STATE_DUAL_EXTENDED;
1019    Shell::GetInstance()->display_configurator()->SetDisplayMode(new_state);
1020    return;
1021  }
1022#endif
1023  // This is fallback path to emulate mirroroing on desktop.
1024  SetSecondDisplayMode(mirrored ? MIRRORING : EXTENDED);
1025  DisplayInfoList display_info_list;
1026  int count = 0;
1027  for (std::map<int64, DisplayInfo>::const_iterator iter =
1028           display_info_.begin();
1029       count < 2; ++iter, ++count) {
1030    display_info_list.push_back(GetDisplayInfo(iter->second.id()));
1031  }
1032  UpdateDisplays(display_info_list);
1033#if defined(OS_CHROMEOS)
1034  if (Shell::GetInstance()->display_configurator_animation()) {
1035    Shell::GetInstance()->display_configurator_animation()->
1036        StartFadeInAnimation();
1037  }
1038#endif
1039}
1040
1041void DisplayManager::AddRemoveDisplay() {
1042  DCHECK(!displays_.empty());
1043  std::vector<DisplayInfo> new_display_info_list;
1044  const DisplayInfo& first_display = GetDisplayInfo(displays_[0].id());
1045  new_display_info_list.push_back(first_display);
1046  // Add if there is only one display connected.
1047  if (num_connected_displays() == 1) {
1048    // Layout the 2nd display below the primary as with the real device.
1049    gfx::Rect host_bounds = first_display.bounds_in_native();
1050    new_display_info_list.push_back(DisplayInfo::CreateFromSpec(
1051        base::StringPrintf(
1052            "%d+%d-500x400", host_bounds.x(), host_bounds.bottom())));
1053  }
1054  num_connected_displays_ = new_display_info_list.size();
1055  mirrored_display_id_ = gfx::Display::kInvalidDisplayID;
1056  non_desktop_display_ = gfx::Display();
1057  UpdateDisplays(new_display_info_list);
1058}
1059
1060void DisplayManager::ToggleDisplayScaleFactor() {
1061  DCHECK(!displays_.empty());
1062  std::vector<DisplayInfo> new_display_info_list;
1063  for (DisplayList::const_iterator iter = displays_.begin();
1064       iter != displays_.end(); ++iter) {
1065    DisplayInfo display_info = GetDisplayInfo(iter->id());
1066    display_info.set_device_scale_factor(
1067        display_info.device_scale_factor() == 1.0f ? 2.0f : 1.0f);
1068    new_display_info_list.push_back(display_info);
1069  }
1070  AddMirrorDisplayInfoIfAny(&new_display_info_list);
1071  UpdateDisplays(new_display_info_list);
1072}
1073
1074#if defined(OS_CHROMEOS)
1075void DisplayManager::SetSoftwareMirroring(bool enabled) {
1076  SetSecondDisplayMode(enabled ? MIRRORING : EXTENDED);
1077}
1078
1079bool DisplayManager::SoftwareMirroringEnabled() const {
1080  return software_mirroring_enabled();
1081}
1082#endif
1083
1084void DisplayManager::SetSecondDisplayMode(SecondDisplayMode mode) {
1085  second_display_mode_ = mode;
1086  mirrored_display_id_ = gfx::Display::kInvalidDisplayID;
1087  non_desktop_display_ = gfx::Display();
1088}
1089
1090bool DisplayManager::UpdateDisplayBounds(int64 display_id,
1091                                         const gfx::Rect& new_bounds) {
1092  if (change_display_upon_host_resize_) {
1093    display_info_[display_id].SetBounds(new_bounds);
1094    // Don't notify observers if the mirrored window has changed.
1095    if (software_mirroring_enabled() && mirrored_display_id_ == display_id)
1096      return false;
1097    gfx::Display* display = FindDisplayForId(display_id);
1098    display->SetSize(display_info_[display_id].size_in_pixel());
1099    screen_ash_->NotifyMetricsChanged(
1100        *display, gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS);
1101    return true;
1102  }
1103  return false;
1104}
1105
1106void DisplayManager::CreateMirrorWindowIfAny() {
1107  NonDesktopDisplayUpdater updater(this, delegate_);
1108}
1109
1110void DisplayManager::CreateScreenForShutdown() const {
1111  bool native_is_ash =
1112      gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_NATIVE) ==
1113      screen_ash_.get();
1114  delete screen_for_shutdown;
1115  screen_for_shutdown = screen_ash_->CloneForShutdown();
1116  gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_ALTERNATE,
1117                                 screen_for_shutdown);
1118  if (native_is_ash) {
1119    gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE,
1120                                   screen_for_shutdown);
1121  }
1122}
1123
1124gfx::Display* DisplayManager::FindDisplayForId(int64 id) {
1125  for (DisplayList::iterator iter = displays_.begin();
1126       iter != displays_.end(); ++iter) {
1127    if ((*iter).id() == id)
1128      return &(*iter);
1129  }
1130  DLOG(WARNING) << "Could not find display:" << id;
1131  return NULL;
1132}
1133
1134void DisplayManager::AddMirrorDisplayInfoIfAny(
1135    std::vector<DisplayInfo>* display_info_list) {
1136  if (software_mirroring_enabled() && IsMirrored())
1137    display_info_list->push_back(GetDisplayInfo(mirrored_display_id_));
1138}
1139
1140void DisplayManager::InsertAndUpdateDisplayInfo(const DisplayInfo& new_info) {
1141  std::map<int64, DisplayInfo>::iterator info =
1142      display_info_.find(new_info.id());
1143  if (info != display_info_.end()) {
1144    info->second.Copy(new_info);
1145  } else {
1146    display_info_[new_info.id()] = new_info;
1147    display_info_[new_info.id()].set_native(false);
1148  }
1149  display_info_[new_info.id()].UpdateDisplaySize();
1150
1151  OnDisplayInfoUpdated(display_info_[new_info.id()]);
1152}
1153
1154void DisplayManager::OnDisplayInfoUpdated(const DisplayInfo& display_info) {
1155#if defined(OS_CHROMEOS)
1156  ui::ColorCalibrationProfile color_profile = display_info.color_profile();
1157  if (color_profile != ui::COLOR_PROFILE_STANDARD) {
1158    Shell::GetInstance()->display_configurator()->SetColorCalibrationProfile(
1159        display_info.id(), color_profile);
1160  }
1161#endif
1162}
1163
1164gfx::Display DisplayManager::CreateDisplayFromDisplayInfoById(int64 id) {
1165  DCHECK(display_info_.find(id) != display_info_.end());
1166  const DisplayInfo& display_info = display_info_[id];
1167
1168  gfx::Display new_display(display_info.id());
1169  gfx::Rect bounds_in_native(display_info.size_in_pixel());
1170  float device_scale_factor = display_info.GetEffectiveDeviceScaleFactor();
1171
1172  // Simply set the origin to (0,0).  The primary display's origin is
1173  // always (0,0) and the secondary display's bounds will be updated
1174  // in |UpdateSecondaryDisplayBoundsForLayout| called in |UpdateDisplay|.
1175  new_display.SetScaleAndBounds(
1176      device_scale_factor, gfx::Rect(bounds_in_native.size()));
1177  new_display.set_rotation(display_info.rotation());
1178  new_display.set_touch_support(display_info.touch_support());
1179  return new_display;
1180}
1181
1182bool DisplayManager::UpdateSecondaryDisplayBoundsForLayout(
1183    DisplayList* displays,
1184    size_t* updated_index) const {
1185  if (displays->size() != 2U)
1186    return false;
1187
1188  int64 id_at_zero = displays->at(0).id();
1189  DisplayIdPair pair =
1190      (id_at_zero == first_display_id_ ||
1191       id_at_zero == gfx::Display::InternalDisplayId()) ?
1192      std::make_pair(id_at_zero, displays->at(1).id()) :
1193      std::make_pair(displays->at(1).id(), id_at_zero);
1194  DisplayLayout layout =
1195      layout_store_->ComputeDisplayLayoutForDisplayIdPair(pair);
1196
1197  // Ignore if a user has a old format (should be extremely rare)
1198  // and this will be replaced with DCHECK.
1199  if (layout.primary_id != gfx::Display::kInvalidDisplayID) {
1200    size_t primary_index, secondary_index;
1201    if (displays->at(0).id() == layout.primary_id) {
1202      primary_index = 0;
1203      secondary_index = 1;
1204    } else {
1205      primary_index = 1;
1206      secondary_index = 0;
1207    }
1208    // This function may be called before the secondary display is
1209    // registered. The bounds is empty in that case and will
1210    // return true.
1211    gfx::Rect bounds =
1212        GetDisplayForId(displays->at(secondary_index).id()).bounds();
1213    UpdateDisplayBoundsForLayout(
1214        layout, displays->at(primary_index), &displays->at(secondary_index));
1215    *updated_index = secondary_index;
1216    return bounds != displays->at(secondary_index).bounds();
1217  }
1218  return false;
1219}
1220
1221// static
1222void DisplayManager::UpdateDisplayBoundsForLayout(
1223    const DisplayLayout& layout,
1224    const gfx::Display& primary_display,
1225    gfx::Display* secondary_display) {
1226  DCHECK_EQ("0,0", primary_display.bounds().origin().ToString());
1227
1228  const gfx::Rect& primary_bounds = primary_display.bounds();
1229  const gfx::Rect& secondary_bounds = secondary_display->bounds();
1230  gfx::Point new_secondary_origin = primary_bounds.origin();
1231
1232  DisplayLayout::Position position = layout.position;
1233
1234  // Ignore the offset in case the secondary display doesn't share edges with
1235  // the primary display.
1236  int offset = layout.offset;
1237  if (position == DisplayLayout::TOP || position == DisplayLayout::BOTTOM) {
1238    offset = std::min(
1239        offset, primary_bounds.width() - kMinimumOverlapForInvalidOffset);
1240    offset = std::max(
1241        offset, -secondary_bounds.width() + kMinimumOverlapForInvalidOffset);
1242  } else {
1243    offset = std::min(
1244        offset, primary_bounds.height() - kMinimumOverlapForInvalidOffset);
1245    offset = std::max(
1246        offset, -secondary_bounds.height() + kMinimumOverlapForInvalidOffset);
1247  }
1248  switch (position) {
1249    case DisplayLayout::TOP:
1250      new_secondary_origin.Offset(offset, -secondary_bounds.height());
1251      break;
1252    case DisplayLayout::RIGHT:
1253      new_secondary_origin.Offset(primary_bounds.width(), offset);
1254      break;
1255    case DisplayLayout::BOTTOM:
1256      new_secondary_origin.Offset(offset, primary_bounds.height());
1257      break;
1258    case DisplayLayout::LEFT:
1259      new_secondary_origin.Offset(-secondary_bounds.width(), offset);
1260      break;
1261  }
1262  gfx::Insets insets = secondary_display->GetWorkAreaInsets();
1263  secondary_display->set_bounds(
1264      gfx::Rect(new_secondary_origin, secondary_bounds.size()));
1265  secondary_display->UpdateWorkAreaFromInsets(insets);
1266}
1267
1268}  // namespace ash
1269