display_manager.cc revision a36e5920737c6adbddd3e43b760e5de8431db6e0 
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 <cmath>
8#include <set>
9#include <string>
10#include <vector>
11
12#include "ash/ash_switches.h"
13#include "ash/display/display_layout_store.h"
14#include "ash/screen_ash.h"
15#include "ash/shell.h"
16#include "base/auto_reset.h"
17#include "base/command_line.h"
18#include "base/logging.h"
19#include "base/strings/string_number_conversions.h"
20#include "base/strings/string_split.h"
21#include "base/strings/stringprintf.h"
22#include "base/strings/utf_string_conversions.h"
23#include "grit/ash_strings.h"
24#include "ui/base/l10n/l10n_util.h"
25#include "ui/gfx/display.h"
26#include "ui/gfx/rect.h"
27#include "ui/gfx/screen.h"
28#include "ui/gfx/size_conversions.h"
29
30#if defined(USE_X11)
31#include "ui/base/x/x11_util.h"
32#endif
33
34#if defined(OS_CHROMEOS)
35#include "ash/display/output_configurator_animation.h"
36#include "base/chromeos/chromeos_version.h"
37#include "chromeos/display/output_configurator.h"
38#endif
39
40#if defined(OS_WIN)
41#include "base/win/windows_version.h"
42#endif
43
44namespace ash {
45namespace internal {
46typedef std::vector<gfx::Display> DisplayList;
47typedef std::vector<DisplayInfo> DisplayInfoList;
48
49namespace {
50
51// The number of pixels to overlap between the primary and secondary displays,
52// in case that the offset value is too large.
53const int kMinimumOverlapForInvalidOffset = 100;
54
55// List of value UI Scale values. Scales for 2x are equivalent to 640,
56// 800, 1024, 1280, 1440, 1600 and 1920 pixel width respectively on
57// 2560 pixel width 2x density display. Please see crbug.com/233375
58// for the full list of resolutions.
59const float kUIScalesFor2x[] = {0.5f, 0.625f, 0.8f, 1.0f, 1.125f, 1.25f, 1.5f};
60const float kUIScalesFor1280[] = {0.5f, 0.625f, 0.8f, 1.0f, 1.125f };
61const float kUIScalesFor1366[] = {0.5f, 0.6f, 0.75f, 1.0f, 1.125f };
62
63struct DisplaySortFunctor {
64  bool operator()(const gfx::Display& a, const gfx::Display& b) {
65    return a.id() < b.id();
66  }
67};
68
69struct DisplayInfoSortFunctor {
70  bool operator()(const DisplayInfo& a, const DisplayInfo& b) {
71    return a.id() < b.id();
72  }
73};
74
75struct ScaleComparator {
76  ScaleComparator(float s) : scale(s) {}
77
78  bool operator()(float s) const {
79    const float kEpsilon = 0.0001f;
80    return std::abs(scale - s) < kEpsilon;
81  }
82  float scale;
83};
84
85gfx::Display& GetInvalidDisplay() {
86  static gfx::Display* invalid_display = new gfx::Display();
87  return *invalid_display;
88}
89
90// Scoped objects used to either create or close the mirror window
91// at specific timing.
92class MirrorWindowCreator {
93 public:
94  MirrorWindowCreator(DisplayManager::Delegate* delegate,
95                      const DisplayInfo& display_info)
96      : delegate_(delegate),
97        display_info_(display_info) {
98  }
99
100  virtual ~MirrorWindowCreator() {
101    if (delegate_)
102      delegate_->CreateOrUpdateMirrorWindow(display_info_);
103  }
104
105 private:
106  DisplayManager::Delegate* delegate_;
107  const DisplayInfo display_info_;
108  DISALLOW_COPY_AND_ASSIGN(MirrorWindowCreator);
109};
110
111class MirrorWindowCloser {
112 public:
113  explicit MirrorWindowCloser(DisplayManager::Delegate* delegate)
114      : delegate_(delegate)  {}
115
116  virtual ~MirrorWindowCloser() {
117    if (delegate_)
118      delegate_->CloseMirrorWindow();
119  }
120
121 private:
122  DisplayManager::Delegate* delegate_;
123
124  DISALLOW_COPY_AND_ASSIGN(MirrorWindowCloser);
125};
126
127}  // namespace
128
129using std::string;
130using std::vector;
131
132DisplayManager::DisplayManager()
133    : delegate_(NULL),
134      layout_store_(new DisplayLayoutStore),
135      first_display_id_(gfx::Display::kInvalidDisplayID),
136      num_connected_displays_(0),
137      force_bounds_changed_(false),
138      change_display_upon_host_resize_(false),
139      software_mirroring_enabled_(false) {
140#if defined(OS_CHROMEOS)
141  change_display_upon_host_resize_ = !base::chromeos::IsRunningOnChromeOS();
142#endif
143}
144
145DisplayManager::~DisplayManager() {
146}
147
148// static
149std::vector<float> DisplayManager::GetScalesForDisplay(
150    const DisplayInfo& info) {
151  std::vector<float> ret;
152  if (info.device_scale_factor() == 2.0f) {
153    ret.assign(kUIScalesFor2x, kUIScalesFor2x + arraysize(kUIScalesFor2x));
154    return ret;
155  }
156  switch (info.bounds_in_pixel().width()) {
157    case 1280:
158      ret.assign(kUIScalesFor1280,
159                 kUIScalesFor1280 + arraysize(kUIScalesFor1280));
160      break;
161    case 1366:
162      ret.assign(kUIScalesFor1366,
163                 kUIScalesFor1366 + arraysize(kUIScalesFor1366));
164      break;
165    default:
166      ret.assign(kUIScalesFor1280,
167                 kUIScalesFor1280 + arraysize(kUIScalesFor1280));
168#if defined(OS_CHROMEOS)
169      if (base::chromeos::IsRunningOnChromeOS())
170        NOTREACHED() << "Unknown resolution:" << info.ToString();
171#endif
172  }
173  return ret;
174}
175
176// static
177float DisplayManager::GetNextUIScale(const DisplayInfo& info, bool up) {
178  float scale = info.ui_scale();
179  std::vector<float> scales = GetScalesForDisplay(info);
180  for (size_t i = 0; i < scales.size(); ++i) {
181    if (ScaleComparator(scales[i])(scale)) {
182      if (up && i != scales.size() - 1)
183        return scales[i + 1];
184      if (!up && i != 0)
185        return scales[i - 1];
186      return scales[i];
187    }
188  }
189  // Fallback to 1.0f if the |scale| wasn't in the list.
190  return 1.0f;
191}
192
193void DisplayManager::InitFromCommandLine() {
194  DisplayInfoList info_list;
195
196  const string size_str = CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
197      switches::kAshHostWindowBounds);
198  vector<string> parts;
199  base::SplitString(size_str, ',', &parts);
200  for (vector<string>::const_iterator iter = parts.begin();
201       iter != parts.end(); ++iter) {
202    info_list.push_back(DisplayInfo::CreateFromSpec(*iter));
203  }
204  CommandLine* command_line = CommandLine::ForCurrentProcess();
205  if (command_line->HasSwitch(switches::kAshUseFirstDisplayAsInternal))
206    gfx::Display::SetInternalDisplayId(info_list[0].id());
207  OnNativeDisplaysChanged(info_list);
208}
209
210// static
211void DisplayManager::UpdateDisplayBoundsForLayoutById(
212    const DisplayLayout& layout,
213    const gfx::Display& primary_display,
214    int64 secondary_display_id) {
215  DCHECK_NE(gfx::Display::kInvalidDisplayID, secondary_display_id);
216  UpdateDisplayBoundsForLayout(
217      layout, primary_display,
218      Shell::GetInstance()->display_manager()->
219      FindDisplayForId(secondary_display_id));
220}
221
222bool DisplayManager::IsActiveDisplay(const gfx::Display& display) const {
223  for (DisplayList::const_iterator iter = displays_.begin();
224       iter != displays_.end(); ++iter) {
225    if ((*iter).id() == display.id())
226      return true;
227  }
228  return false;
229}
230
231bool DisplayManager::HasInternalDisplay() const {
232  return gfx::Display::InternalDisplayId() != gfx::Display::kInvalidDisplayID;
233}
234
235bool DisplayManager::IsInternalDisplayId(int64 id) const {
236  return gfx::Display::InternalDisplayId() == id;
237}
238
239const gfx::Display& DisplayManager::GetDisplayForId(int64 id) const {
240  gfx::Display* display =
241      const_cast<DisplayManager*>(this)->FindDisplayForId(id);
242  return display ? *display : GetInvalidDisplay();
243}
244
245const gfx::Display& DisplayManager::FindDisplayContainingPoint(
246    const gfx::Point& point_in_screen) const {
247  for (DisplayList::const_iterator iter = displays_.begin();
248       iter != displays_.end(); ++iter) {
249    const gfx::Display& display = *iter;
250    if (display.bounds().Contains(point_in_screen))
251      return display;
252  }
253  return GetInvalidDisplay();
254}
255
256bool DisplayManager::UpdateWorkAreaOfDisplay(int64 display_id,
257                                             const gfx::Insets& insets) {
258  gfx::Display* display = FindDisplayForId(display_id);
259  DCHECK(display);
260  gfx::Rect old_work_area = display->work_area();
261  display->UpdateWorkAreaFromInsets(insets);
262  return old_work_area != display->work_area();
263}
264
265void DisplayManager::SetOverscanInsets(int64 display_id,
266                                       const gfx::Insets& insets_in_dip) {
267  display_info_[display_id].SetOverscanInsets(insets_in_dip);
268  DisplayInfoList display_info_list;
269  for (DisplayList::const_iterator iter = displays_.begin();
270       iter != displays_.end(); ++iter) {
271    display_info_list.push_back(GetDisplayInfo(iter->id()));
272  }
273  AddMirrorDisplayInfoIfAny(&display_info_list);
274  UpdateDisplays(display_info_list);
275}
276
277void DisplayManager::SetDisplayRotation(int64 display_id,
278                                        gfx::Display::Rotation rotation) {
279  if (!IsDisplayRotationEnabled())
280    return;
281  DisplayInfoList display_info_list;
282  for (DisplayList::const_iterator iter = displays_.begin();
283       iter != displays_.end(); ++iter) {
284    DisplayInfo info = GetDisplayInfo(iter->id());
285    if (info.id() == display_id) {
286      if (info.rotation() == rotation)
287        return;
288      info.set_rotation(rotation);
289    }
290    display_info_list.push_back(info);
291  }
292  AddMirrorDisplayInfoIfAny(&display_info_list);
293  UpdateDisplays(display_info_list);
294}
295
296void DisplayManager::SetDisplayUIScale(int64 display_id,
297                                       float ui_scale) {
298  if (!IsDisplayUIScalingEnabled() ||
299      gfx::Display::InternalDisplayId() != display_id) {
300    return;
301  }
302
303  DisplayInfoList display_info_list;
304  for (DisplayList::const_iterator iter = displays_.begin();
305       iter != displays_.end(); ++iter) {
306    DisplayInfo info = GetDisplayInfo(iter->id());
307    if (info.id() == display_id) {
308      if (info.ui_scale() == ui_scale)
309        return;
310      std::vector<float> scales = GetScalesForDisplay(info);
311      ScaleComparator comparator(ui_scale);
312      if (std::find_if(scales.begin(), scales.end(), comparator) ==
313          scales.end()) {
314        return;
315      }
316      info.set_ui_scale(ui_scale);
317    }
318    display_info_list.push_back(info);
319  }
320  AddMirrorDisplayInfoIfAny(&display_info_list);
321  UpdateDisplays(display_info_list);
322}
323
324void DisplayManager::SetDisplayResolution(int64 display_id,
325                                          const gfx::Size& resolution) {
326  DCHECK_NE(gfx::Display::InternalDisplayId(), display_id);
327  if (gfx::Display::InternalDisplayId() == display_id)
328    return;
329  resolutions_[display_id] = resolution;
330#if defined(OS_CHROMEOS) && defined(USE_X11)
331  if (base::chromeos::IsRunningOnChromeOS())
332    Shell::GetInstance()->output_configurator()->ScheduleConfigureOutputs();
333#endif
334}
335
336void DisplayManager::RegisterDisplayProperty(
337    int64 display_id,
338    gfx::Display::Rotation rotation,
339    float ui_scale,
340    const gfx::Insets* overscan_insets,
341    const gfx::Size& resolution_in_pixels) {
342  if (display_info_.find(display_id) == display_info_.end()) {
343    display_info_[display_id] =
344        DisplayInfo(display_id, std::string(""), false);
345  }
346
347  display_info_[display_id].set_rotation(rotation);
348  // Just in case the preference file was corrupted.
349  if (0.5f <= ui_scale && ui_scale <= 2.0f)
350    display_info_[display_id].set_ui_scale(ui_scale);
351  if (overscan_insets)
352    display_info_[display_id].SetOverscanInsets(*overscan_insets);
353  if (!resolution_in_pixels.IsEmpty())
354    resolutions_[display_id] = resolution_in_pixels;
355}
356
357bool DisplayManager::GetSelectedResolutionForDisplayId(
358    int64 id,
359    gfx::Size* resolution_out) const {
360  std::map<int64, gfx::Size>::const_iterator iter =
361      resolutions_.find(id);
362  if (iter == resolutions_.end())
363    return false;
364  *resolution_out = iter->second;
365  return true;
366}
367
368bool DisplayManager::IsDisplayRotationEnabled() const {
369  static bool enabled = !CommandLine::ForCurrentProcess()->
370      HasSwitch(switches::kAshDisableDisplayRotation);
371  return enabled;
372}
373
374bool DisplayManager::IsDisplayUIScalingEnabled() const {
375  static bool enabled = !CommandLine::ForCurrentProcess()->
376      HasSwitch(switches::kAshDisableUIScaling);
377  if (!enabled)
378    return false;
379  return GetDisplayIdForUIScaling() != gfx::Display::kInvalidDisplayID;
380}
381
382gfx::Insets DisplayManager::GetOverscanInsets(int64 display_id) const {
383  std::map<int64, DisplayInfo>::const_iterator it =
384      display_info_.find(display_id);
385  return (it != display_info_.end()) ?
386      it->second.overscan_insets_in_dip() : gfx::Insets();
387}
388
389void DisplayManager::OnNativeDisplaysChanged(
390    const std::vector<DisplayInfo>& updated_displays) {
391  if (updated_displays.empty()) {
392    // If the device is booted without display, or chrome is started
393    // without --ash-host-window-bounds on linux desktop, use the
394    // default display.
395    if (displays_.empty()) {
396      std::vector<DisplayInfo> init_displays;
397      init_displays.push_back(DisplayInfo::CreateFromSpec(std::string()));
398      OnNativeDisplaysChanged(init_displays);
399    } else {
400      // Otherwise don't update the displays when all displays are disconnected.
401      // This happens when:
402      // - the device is idle and powerd requested to turn off all displays.
403      // - the device is suspended. (kernel turns off all displays)
404      // - the internal display's brightness is set to 0 and no external
405      //   display is connected.
406      // - the internal display's brightness is 0 and external display is
407      //   disconnected.
408      // The display will be updated when one of displays is turned on, and the
409      // display list will be updated correctly.
410    }
411    return;
412  }
413  first_display_id_ = updated_displays[0].id();
414  std::set<gfx::Point> origins;
415
416  if (updated_displays.size() == 1) {
417    VLOG(1) << "OnNativeDisplaysChanged(1):" << updated_displays[0].ToString();
418  } else {
419    VLOG(1) << "OnNativeDisplaysChanged(" << updated_displays.size()
420            << ") [0]=" << updated_displays[0].ToString()
421            << ", [1]=" << updated_displays[1].ToString();
422  }
423
424  bool internal_display_connected = false;
425  num_connected_displays_ = updated_displays.size();
426  mirrored_display_ = gfx::Display();
427  DisplayInfoList new_display_info_list;
428  for (DisplayInfoList::const_iterator iter = updated_displays.begin();
429       iter != updated_displays.end();
430       ++iter) {
431    if (!internal_display_connected)
432      internal_display_connected = IsInternalDisplayId(iter->id());
433    // Mirrored monitors have the same origins.
434    gfx::Point origin = iter->bounds_in_pixel().origin();
435    if (origins.find(origin) != origins.end()) {
436      InsertAndUpdateDisplayInfo(*iter);
437      mirrored_display_ = CreateDisplayFromDisplayInfoById(iter->id());
438    } else {
439      origins.insert(origin);
440      new_display_info_list.push_back(*iter);
441    }
442  }
443  if (HasInternalDisplay() &&
444      !internal_display_connected &&
445      display_info_.find(gfx::Display::InternalDisplayId()) ==
446      display_info_.end()) {
447    DisplayInfo internal_display_info(
448        gfx::Display::InternalDisplayId(),
449        l10n_util::GetStringUTF8(IDS_ASH_INTERNAL_DISPLAY_NAME),
450        false  /*Internal display must not have overscan */);
451    internal_display_info.SetBounds(gfx::Rect(0, 0, 800, 600));
452    display_info_[gfx::Display::InternalDisplayId()] = internal_display_info;
453  }
454  UpdateDisplays(new_display_info_list);
455}
456
457void DisplayManager::UpdateDisplays() {
458  DisplayInfoList display_info_list;
459  for (DisplayList::const_iterator iter = displays_.begin();
460       iter != displays_.end(); ++iter) {
461    display_info_list.push_back(GetDisplayInfo(iter->id()));
462  }
463  AddMirrorDisplayInfoIfAny(&display_info_list);
464  UpdateDisplays(display_info_list);
465}
466
467void DisplayManager::UpdateDisplays(
468    const std::vector<DisplayInfo>& updated_display_info_list) {
469#if defined(OS_WIN)
470  if (base::win::GetVersion() >= base::win::VERSION_WIN8) {
471    DCHECK_EQ(1u, updated_display_info_list.size()) <<
472        "Multiple display test does not work on Win8 bots. Please "
473        "skip (don't disable) the test using SupportsMultipleDisplays()";
474  }
475#endif
476
477  DisplayInfoList new_display_info_list = updated_display_info_list;
478  std::sort(displays_.begin(), displays_.end(), DisplaySortFunctor());
479  std::sort(new_display_info_list.begin(),
480            new_display_info_list.end(),
481            DisplayInfoSortFunctor());
482  DisplayList removed_displays;
483  std::vector<size_t> changed_display_indices;
484  std::vector<size_t> added_display_indices;
485
486  DisplayList::iterator curr_iter = displays_.begin();
487  DisplayInfoList::const_iterator new_info_iter = new_display_info_list.begin();
488
489  DisplayList new_displays;
490
491  scoped_ptr<MirrorWindowCreator> mirror_window_creater;
492
493  // Use the internal display or 1st as the mirror source, then scale
494  // the root window so that it matches the external display's
495  // resolution. This is necessary in order for scaling to work while
496  // mirrored.
497  int64 mirrored_display_id = gfx::Display::kInvalidDisplayID;
498  if (software_mirroring_enabled_ && new_display_info_list.size() == 2)
499    mirrored_display_id = new_display_info_list[1].id();
500
501  while (curr_iter != displays_.end() ||
502         new_info_iter != new_display_info_list.end()) {
503    if (new_info_iter != new_display_info_list.end() &&
504        mirrored_display_id == new_info_iter->id()) {
505      DisplayInfo info = *new_info_iter;
506      info.SetOverscanInsets(gfx::Insets());
507      InsertAndUpdateDisplayInfo(info);
508
509      mirrored_display_ = CreateDisplayFromDisplayInfoById(new_info_iter->id());
510      mirror_window_creater.reset(new MirrorWindowCreator(
511          delegate_, display_info_[new_info_iter->id()]));
512      ++new_info_iter;
513      // Remove existing external dispaly if it is going to be mirrored.
514      if (curr_iter != displays_.end() &&
515          curr_iter->id() == mirrored_display_id) {
516        removed_displays.push_back(*curr_iter);
517        ++curr_iter;
518      }
519      continue;
520    }
521
522    if (curr_iter == displays_.end()) {
523      // more displays in new list.
524      added_display_indices.push_back(new_displays.size());
525      InsertAndUpdateDisplayInfo(*new_info_iter);
526      new_displays.push_back(
527          CreateDisplayFromDisplayInfoById(new_info_iter->id()));
528      ++new_info_iter;
529    } else if (new_info_iter == new_display_info_list.end()) {
530      // more displays in current list.
531      removed_displays.push_back(*curr_iter);
532      ++curr_iter;
533    } else if (curr_iter->id() == new_info_iter->id()) {
534      const gfx::Display& current_display = *curr_iter;
535      // Copy the info because |CreateDisplayFromInfo| updates the instance.
536      const DisplayInfo current_display_info =
537          GetDisplayInfo(current_display.id());
538      InsertAndUpdateDisplayInfo(*new_info_iter);
539      gfx::Display new_display =
540          CreateDisplayFromDisplayInfoById(new_info_iter->id());
541      const DisplayInfo& new_display_info = GetDisplayInfo(new_display.id());
542
543      bool host_window_bounds_changed =
544          current_display_info.bounds_in_pixel() !=
545          new_display_info.bounds_in_pixel();
546
547      if (force_bounds_changed_ ||
548          host_window_bounds_changed ||
549          (current_display.device_scale_factor() !=
550           new_display.device_scale_factor()) ||
551          (current_display_info.size_in_pixel() !=
552           new_display.GetSizeInPixel()) ||
553          (current_display.rotation() != new_display.rotation())) {
554
555        changed_display_indices.push_back(new_displays.size());
556      }
557
558      new_display.UpdateWorkAreaFromInsets(current_display.GetWorkAreaInsets());
559      new_displays.push_back(new_display);
560      ++curr_iter;
561      ++new_info_iter;
562    } else if (curr_iter->id() < new_info_iter->id()) {
563      // more displays in current list between ids, which means it is deleted.
564      removed_displays.push_back(*curr_iter);
565      ++curr_iter;
566    } else {
567      // more displays in new list between ids, which means it is added.
568      added_display_indices.push_back(new_displays.size());
569      InsertAndUpdateDisplayInfo(*new_info_iter);
570      new_displays.push_back(
571          CreateDisplayFromDisplayInfoById(new_info_iter->id()));
572      ++new_info_iter;
573    }
574  }
575
576  scoped_ptr<MirrorWindowCloser> mirror_window_closer;
577  // Try to close mirror window unless mirror window is necessary.
578  if (!mirror_window_creater.get())
579    mirror_window_closer.reset(new MirrorWindowCloser(delegate_));
580
581  // Do not update |displays_| if there's nothing to be updated. Without this,
582  // it will not update the display layout, which causes the bug
583  // http://crbug.com/155948.
584  if (changed_display_indices.empty() && added_display_indices.empty() &&
585      removed_displays.empty()) {
586    return;
587  }
588  if (delegate_)
589    delegate_->PreDisplayConfigurationChange();
590
591  size_t updated_index;
592  if (UpdateSecondaryDisplayBoundsForLayout(&new_displays, &updated_index) &&
593      std::find(added_display_indices.begin(),
594                added_display_indices.end(),
595                updated_index) == added_display_indices.end() &&
596      std::find(changed_display_indices.begin(),
597                changed_display_indices.end(),
598                updated_index) == changed_display_indices.end()) {
599    changed_display_indices.push_back(updated_index);
600  }
601
602  displays_ = new_displays;
603
604  base::AutoReset<bool> resetter(&change_display_upon_host_resize_, false);
605
606  // Temporarily add displays to be removed because display object
607  // being removed are accessed during shutting down the root.
608  displays_.insert(displays_.end(), removed_displays.begin(),
609                   removed_displays.end());
610
611  for (DisplayList::const_reverse_iterator iter = removed_displays.rbegin();
612       iter != removed_displays.rend(); ++iter) {
613    Shell::GetInstance()->screen()->NotifyDisplayRemoved(displays_.back());
614    displays_.pop_back();
615  }
616  // Close the mirror window here to avoid creating two compositor on
617  // one display.
618  mirror_window_closer.reset();
619  for (std::vector<size_t>::iterator iter = added_display_indices.begin();
620       iter != added_display_indices.end(); ++iter) {
621    Shell::GetInstance()->screen()->NotifyDisplayAdded(displays_[*iter]);
622  }
623  // Create the mirror window after all displays are added so that
624  // it can mirror the display newly added. This can happen when switching
625  // from dock mode to software mirror mode.
626  mirror_window_creater.reset();
627  for (std::vector<size_t>::iterator iter = changed_display_indices.begin();
628       iter != changed_display_indices.end(); ++iter) {
629    Shell::GetInstance()->screen()->NotifyBoundsChanged(displays_[*iter]);
630  }
631  if (delegate_)
632    delegate_->PostDisplayConfigurationChange();
633
634#if defined(USE_X11) && defined(OS_CHROMEOS)
635  if (!changed_display_indices.empty() && base::chromeos::IsRunningOnChromeOS())
636    ui::ClearX11DefaultRootWindow();
637#endif
638}
639
640const gfx::Display& DisplayManager::GetDisplayAt(size_t index) const {
641  DCHECK_LT(index, displays_.size());
642  return displays_[index];
643}
644
645const gfx::Display* DisplayManager::GetPrimaryDisplayCandidate() const {
646  const gfx::Display* primary_candidate = &displays_[0];
647#if defined(OS_CHROMEOS)
648  if (base::chromeos::IsRunningOnChromeOS()) {
649    // On ChromeOS device, root windows are stacked vertically, and
650    // default primary is the one on top.
651    int count = GetNumDisplays();
652    int y = GetDisplayInfo(primary_candidate->id()).bounds_in_pixel().y();
653    for (int i = 1; i < count; ++i) {
654      const gfx::Display* display = &displays_[i];
655      const DisplayInfo& display_info = GetDisplayInfo(display->id());
656      if (display->IsInternal()) {
657        primary_candidate = display;
658        break;
659      } else if (display_info.bounds_in_pixel().y() < y) {
660        primary_candidate = display;
661        y = display_info.bounds_in_pixel().y();
662      }
663    }
664  }
665#endif
666  return primary_candidate;
667}
668
669size_t DisplayManager::GetNumDisplays() const {
670  return displays_.size();
671}
672
673bool DisplayManager::IsMirrored() const {
674  return mirrored_display_.id() != gfx::Display::kInvalidDisplayID;
675}
676
677const DisplayInfo& DisplayManager::GetDisplayInfo(int64 display_id) const {
678  std::map<int64, DisplayInfo>::const_iterator iter =
679      display_info_.find(display_id);
680  CHECK(iter != display_info_.end()) << display_id;
681  return iter->second;
682}
683
684std::string DisplayManager::GetDisplayNameForId(int64 id) {
685  if (id == gfx::Display::kInvalidDisplayID)
686    return l10n_util::GetStringUTF8(IDS_ASH_STATUS_TRAY_UNKNOWN_DISPLAY_NAME);
687
688  std::map<int64, DisplayInfo>::const_iterator iter = display_info_.find(id);
689  if (iter != display_info_.end() && !iter->second.name().empty())
690    return iter->second.name();
691
692  return base::StringPrintf("Display %d", static_cast<int>(id));
693}
694
695int64 DisplayManager::GetDisplayIdForUIScaling() const {
696  // UI Scaling is effective only on internal display.
697  int64 display_id = gfx::Display::InternalDisplayId();
698#if defined(OS_WIN)
699  display_id = first_display_id();
700#endif
701  return display_id;
702}
703
704void DisplayManager::SetMirrorMode(bool mirrored) {
705  if (num_connected_displays() <= 1)
706    return;
707
708#if defined(OS_CHROMEOS)
709  if (base::chromeos::IsRunningOnChromeOS()) {
710    chromeos::OutputState new_state = mirrored ?
711        chromeos::STATE_DUAL_MIRROR : chromeos::STATE_DUAL_EXTENDED;
712    Shell::GetInstance()->output_configurator()->SetDisplayMode(new_state);
713    return;
714  }
715#endif
716  SetSoftwareMirroring(mirrored);
717  DisplayInfoList display_info_list;
718  int count = 0;
719  for (std::map<int64, DisplayInfo>::const_iterator iter =
720           display_info_.begin();
721       count < 2; ++iter, ++count) {
722    display_info_list.push_back(GetDisplayInfo(iter->second.id()));
723  }
724  UpdateDisplays(display_info_list);
725#if defined(OS_CHROMEOS)
726  if (Shell::GetInstance()->output_configurator_animation()) {
727    Shell::GetInstance()->output_configurator_animation()->
728        StartFadeInAnimation();
729  }
730#endif
731}
732
733void DisplayManager::AddRemoveDisplay() {
734  DCHECK(!displays_.empty());
735  std::vector<DisplayInfo> new_display_info_list;
736  DisplayInfo first_display = GetDisplayInfo(displays_[0].id());
737  new_display_info_list.push_back(first_display);
738  // Add if there is only one display connected.
739  if (num_connected_displays() == 1) {
740    // Layout the 2nd display below the primary as with the real device.
741    gfx::Rect host_bounds = first_display.bounds_in_pixel();
742    new_display_info_list.push_back(DisplayInfo::CreateFromSpec(
743        base::StringPrintf(
744            "%d+%d-500x400", host_bounds.x(), host_bounds.bottom())));
745  }
746  num_connected_displays_ = new_display_info_list.size();
747  mirrored_display_ = gfx::Display();
748  UpdateDisplays(new_display_info_list);
749}
750
751void DisplayManager::ToggleDisplayScaleFactor() {
752  DCHECK(!displays_.empty());
753  std::vector<DisplayInfo> new_display_info_list;
754  for (DisplayList::const_iterator iter = displays_.begin();
755       iter != displays_.end(); ++iter) {
756    DisplayInfo display_info = GetDisplayInfo(iter->id());
757    display_info.set_device_scale_factor(
758        display_info.device_scale_factor() == 1.0f ? 2.0f : 1.0f);
759    new_display_info_list.push_back(display_info);
760  }
761  AddMirrorDisplayInfoIfAny(&new_display_info_list);
762  UpdateDisplays(new_display_info_list);
763}
764
765void DisplayManager::SetSoftwareMirroring(bool enabled) {
766  software_mirroring_enabled_ = enabled;
767  mirrored_display_ = gfx::Display();
768}
769
770bool DisplayManager::UpdateDisplayBounds(int64 display_id,
771                                         const gfx::Rect& new_bounds) {
772  if (change_display_upon_host_resize_) {
773    display_info_[display_id].SetBounds(new_bounds);
774    // Don't notify observers if the mirrored window has changed.
775    if (software_mirroring_enabled_ && mirrored_display_.id() == display_id)
776      return false;
777    gfx::Display* display = FindDisplayForId(display_id);
778    display->SetSize(display_info_[display_id].size_in_pixel());
779    Shell::GetInstance()->screen()->NotifyBoundsChanged(*display);
780    return true;
781  }
782  return false;
783}
784
785gfx::Display* DisplayManager::FindDisplayForId(int64 id) {
786  for (DisplayList::iterator iter = displays_.begin();
787       iter != displays_.end(); ++iter) {
788    if ((*iter).id() == id)
789      return &(*iter);
790  }
791  DLOG(WARNING) << "Could not find display:" << id;
792  return NULL;
793}
794
795void DisplayManager::AddMirrorDisplayInfoIfAny(
796    std::vector<DisplayInfo>* display_info_list) {
797  if (software_mirroring_enabled_ && mirrored_display_.is_valid())
798    display_info_list->push_back(GetDisplayInfo(mirrored_display_.id()));
799}
800
801void DisplayManager::InsertAndUpdateDisplayInfo(const DisplayInfo& new_info) {
802  std::map<int64, DisplayInfo>::iterator info =
803      display_info_.find(new_info.id());
804  if (info != display_info_.end())
805    info->second.Copy(new_info);
806  else {
807    display_info_[new_info.id()] = new_info;
808    display_info_[new_info.id()].set_native(false);
809  }
810  display_info_[new_info.id()].UpdateDisplaySize();
811}
812
813gfx::Display DisplayManager::CreateDisplayFromDisplayInfoById(int64 id) {
814  DCHECK(display_info_.find(id) != display_info_.end());
815  const DisplayInfo& display_info = display_info_[id];
816
817  gfx::Display new_display(display_info.id());
818  gfx::Rect bounds_in_pixel(display_info.size_in_pixel());
819
820  // Simply set the origin to (0,0).  The primary display's origin is
821  // always (0,0) and the secondary display's bounds will be updated
822  // in |UpdateSecondaryDisplayBoundsForLayout| called in |UpdateDisplay|.
823  new_display.SetScaleAndBounds(
824      display_info.device_scale_factor(), gfx::Rect(bounds_in_pixel.size()));
825  new_display.set_rotation(display_info.rotation());
826  return new_display;
827}
828
829bool DisplayManager::UpdateSecondaryDisplayBoundsForLayout(
830    DisplayList* displays,
831    size_t* updated_index) const {
832  if (displays->size() != 2U)
833    return false;
834
835  int64 id_at_zero = displays->at(0).id();
836  DisplayIdPair pair =
837      (id_at_zero == first_display_id_ ||
838       id_at_zero == gfx::Display::InternalDisplayId()) ?
839      std::make_pair(id_at_zero, displays->at(1).id()) :
840      std::make_pair(displays->at(1).id(), id_at_zero) ;
841  DisplayLayout layout =
842      layout_store_->ComputeDisplayLayoutForDisplayIdPair(pair);
843
844  // Ignore if a user has a old format (should be extremely rare)
845  // and this will be replaced with DCHECK.
846  if (layout.primary_id != gfx::Display::kInvalidDisplayID) {
847    size_t primary_index, secondary_index;
848    if (displays->at(0).id() == layout.primary_id) {
849      primary_index = 0;
850      secondary_index = 1;
851    } else {
852      primary_index = 1;
853      secondary_index = 0;
854    }
855    gfx::Rect bounds =
856        GetDisplayForId(displays->at(secondary_index).id()).bounds();
857    UpdateDisplayBoundsForLayout(
858        layout, displays->at(primary_index), &displays->at(secondary_index));
859    *updated_index = secondary_index;
860    return bounds != displays->at(secondary_index).bounds();
861  }
862  return false;
863}
864
865// static
866void DisplayManager::UpdateDisplayBoundsForLayout(
867    const DisplayLayout& layout,
868    const gfx::Display& primary_display,
869    gfx::Display* secondary_display) {
870  DCHECK_EQ("0,0", primary_display.bounds().origin().ToString());
871
872  const gfx::Rect& primary_bounds = primary_display.bounds();
873  const gfx::Rect& secondary_bounds = secondary_display->bounds();
874  gfx::Point new_secondary_origin = primary_bounds.origin();
875
876  DisplayLayout::Position position = layout.position;
877
878  // Ignore the offset in case the secondary display doesn't share edges with
879  // the primary display.
880  int offset = layout.offset;
881  if (position == DisplayLayout::TOP || position == DisplayLayout::BOTTOM) {
882    offset = std::min(
883        offset, primary_bounds.width() - kMinimumOverlapForInvalidOffset);
884    offset = std::max(
885        offset, -secondary_bounds.width() + kMinimumOverlapForInvalidOffset);
886  } else {
887    offset = std::min(
888        offset, primary_bounds.height() - kMinimumOverlapForInvalidOffset);
889    offset = std::max(
890        offset, -secondary_bounds.height() + kMinimumOverlapForInvalidOffset);
891  }
892  switch (position) {
893    case DisplayLayout::TOP:
894      new_secondary_origin.Offset(offset, -secondary_bounds.height());
895      break;
896    case DisplayLayout::RIGHT:
897      new_secondary_origin.Offset(primary_bounds.width(), offset);
898      break;
899    case DisplayLayout::BOTTOM:
900      new_secondary_origin.Offset(offset, primary_bounds.height());
901      break;
902    case DisplayLayout::LEFT:
903      new_secondary_origin.Offset(-secondary_bounds.width(), offset);
904      break;
905  }
906  gfx::Insets insets = secondary_display->GetWorkAreaInsets();
907  secondary_display->set_bounds(
908      gfx::Rect(new_secondary_origin, secondary_bounds.size()));
909  secondary_display->UpdateWorkAreaFromInsets(insets);
910}
911
912}  // namespace internal
913}  // namespace ash
914