display_manager.cc revision ca12bfac764ba476d6cd062bf1dde12cc64c3f40 
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::RegisterDisplayProperty(
325    int64 display_id,
326    gfx::Display::Rotation rotation,
327    float ui_scale,
328    const gfx::Insets* overscan_insets) {
329  if (display_info_.find(display_id) == display_info_.end()) {
330    display_info_[display_id] =
331        DisplayInfo(display_id, std::string(""), false);
332  }
333
334  display_info_[display_id].set_rotation(rotation);
335  // Just in case the preference file was corrupted.
336  if (0.5f <= ui_scale && ui_scale <= 2.0f)
337    display_info_[display_id].set_ui_scale(ui_scale);
338  if (overscan_insets)
339    display_info_[display_id].SetOverscanInsets(*overscan_insets);
340}
341
342bool DisplayManager::IsDisplayRotationEnabled() const {
343  static bool enabled = !CommandLine::ForCurrentProcess()->
344      HasSwitch(switches::kAshDisableDisplayRotation);
345  return enabled;
346}
347
348bool DisplayManager::IsDisplayUIScalingEnabled() const {
349  static bool enabled = !CommandLine::ForCurrentProcess()->
350      HasSwitch(switches::kAshDisableUIScaling);
351  if (!enabled)
352    return false;
353  return GetDisplayIdForUIScaling() != gfx::Display::kInvalidDisplayID;
354}
355
356gfx::Insets DisplayManager::GetOverscanInsets(int64 display_id) const {
357  std::map<int64, DisplayInfo>::const_iterator it =
358      display_info_.find(display_id);
359  return (it != display_info_.end()) ?
360      it->second.overscan_insets_in_dip() : gfx::Insets();
361}
362
363void DisplayManager::OnNativeDisplaysChanged(
364    const std::vector<DisplayInfo>& updated_displays) {
365  if (updated_displays.empty()) {
366    // If the device is booted without display, or chrome is started
367    // without --ash-host-window-bounds on linux desktop, use the
368    // default display.
369    if (displays_.empty()) {
370      std::vector<DisplayInfo> init_displays;
371      init_displays.push_back(DisplayInfo::CreateFromSpec(std::string()));
372      OnNativeDisplaysChanged(init_displays);
373    } else {
374      // Otherwise don't update the displays when all displays are disconnected.
375      // This happens when:
376      // - the device is idle and powerd requested to turn off all displays.
377      // - the device is suspended. (kernel turns off all displays)
378      // - the internal display's brightness is set to 0 and no external
379      //   display is connected.
380      // - the internal display's brightness is 0 and external display is
381      //   disconnected.
382      // The display will be updated when one of displays is turned on, and the
383      // display list will be updated correctly.
384    }
385    return;
386  }
387  first_display_id_ = updated_displays[0].id();
388  std::set<gfx::Point> origins;
389
390  if (updated_displays.size() == 1) {
391    VLOG(1) << "OnNativeDisplaysChanged(1):" << updated_displays[0].ToString();
392  } else {
393    VLOG(1) << "OnNativeDisplaysChanged(" << updated_displays.size()
394            << ") [0]=" << updated_displays[0].ToString()
395            << ", [1]=" << updated_displays[1].ToString();
396  }
397
398  bool internal_display_connected = false;
399  num_connected_displays_ = updated_displays.size();
400  mirrored_display_ = gfx::Display();
401  DisplayInfoList new_display_info_list;
402  for (DisplayInfoList::const_iterator iter = updated_displays.begin();
403       iter != updated_displays.end();
404       ++iter) {
405    if (!internal_display_connected)
406      internal_display_connected = IsInternalDisplayId(iter->id());
407    // Mirrored monitors have the same origins.
408    gfx::Point origin = iter->bounds_in_pixel().origin();
409    if (origins.find(origin) != origins.end()) {
410      InsertAndUpdateDisplayInfo(*iter);
411      mirrored_display_ = CreateDisplayFromDisplayInfoById(iter->id());
412    } else {
413      origins.insert(origin);
414      new_display_info_list.push_back(*iter);
415    }
416  }
417  if (HasInternalDisplay() &&
418      !internal_display_connected &&
419      display_info_.find(gfx::Display::InternalDisplayId()) ==
420      display_info_.end()) {
421    DisplayInfo internal_display_info(
422        gfx::Display::InternalDisplayId(),
423        l10n_util::GetStringUTF8(IDS_ASH_INTERNAL_DISPLAY_NAME),
424        false  /*Internal display must not have overscan */);
425    internal_display_info.SetBounds(gfx::Rect(0, 0, 800, 600));
426    display_info_[gfx::Display::InternalDisplayId()] = internal_display_info;
427  }
428  UpdateDisplays(new_display_info_list);
429}
430
431void DisplayManager::UpdateDisplays() {
432  DisplayInfoList display_info_list;
433  for (DisplayList::const_iterator iter = displays_.begin();
434       iter != displays_.end(); ++iter) {
435    display_info_list.push_back(GetDisplayInfo(iter->id()));
436  }
437  AddMirrorDisplayInfoIfAny(&display_info_list);
438  UpdateDisplays(display_info_list);
439}
440
441void DisplayManager::UpdateDisplays(
442    const std::vector<DisplayInfo>& updated_display_info_list) {
443#if defined(OS_WIN)
444  if (base::win::GetVersion() >= base::win::VERSION_WIN8) {
445    DCHECK_EQ(1u, updated_display_info_list.size()) <<
446        "Multiple display test does not work on Win8 bots. Please "
447        "skip (don't disable) the test using SupportsMultipleDisplays()";
448  }
449#endif
450
451  DisplayInfoList new_display_info_list = updated_display_info_list;
452  std::sort(displays_.begin(), displays_.end(), DisplaySortFunctor());
453  std::sort(new_display_info_list.begin(),
454            new_display_info_list.end(),
455            DisplayInfoSortFunctor());
456  DisplayList removed_displays;
457  std::vector<size_t> changed_display_indices;
458  std::vector<size_t> added_display_indices;
459
460  DisplayList::iterator curr_iter = displays_.begin();
461  DisplayInfoList::const_iterator new_info_iter = new_display_info_list.begin();
462
463  DisplayList new_displays;
464
465  scoped_ptr<MirrorWindowCreator> mirror_window_creater;
466
467  // Use the internal display or 1st as the mirror source, then scale
468  // the root window so that it matches the external display's
469  // resolution. This is necessary in order for scaling to work while
470  // mirrored.
471  int64 mirrored_display_id = gfx::Display::kInvalidDisplayID;
472  if (software_mirroring_enabled_ && new_display_info_list.size() == 2)
473    mirrored_display_id = new_display_info_list[1].id();
474
475  while (curr_iter != displays_.end() ||
476         new_info_iter != new_display_info_list.end()) {
477    if (new_info_iter != new_display_info_list.end() &&
478        mirrored_display_id == new_info_iter->id()) {
479      DisplayInfo info = *new_info_iter;
480      info.SetOverscanInsets(gfx::Insets());
481      InsertAndUpdateDisplayInfo(info);
482
483      mirrored_display_ = CreateDisplayFromDisplayInfoById(new_info_iter->id());
484      mirror_window_creater.reset(new MirrorWindowCreator(
485          delegate_, display_info_[new_info_iter->id()]));
486      ++new_info_iter;
487      // Remove existing external dispaly if it is going to be mirrored.
488      if (curr_iter != displays_.end() &&
489          curr_iter->id() == mirrored_display_id) {
490        removed_displays.push_back(*curr_iter);
491        ++curr_iter;
492      }
493      continue;
494    }
495
496    if (curr_iter == displays_.end()) {
497      // more displays in new list.
498      added_display_indices.push_back(new_displays.size());
499      InsertAndUpdateDisplayInfo(*new_info_iter);
500      new_displays.push_back(
501          CreateDisplayFromDisplayInfoById(new_info_iter->id()));
502      ++new_info_iter;
503    } else if (new_info_iter == new_display_info_list.end()) {
504      // more displays in current list.
505      removed_displays.push_back(*curr_iter);
506      ++curr_iter;
507    } else if (curr_iter->id() == new_info_iter->id()) {
508      const gfx::Display& current_display = *curr_iter;
509      // Copy the info because |CreateDisplayFromInfo| updates the instance.
510      const DisplayInfo current_display_info =
511          GetDisplayInfo(current_display.id());
512      InsertAndUpdateDisplayInfo(*new_info_iter);
513      gfx::Display new_display =
514          CreateDisplayFromDisplayInfoById(new_info_iter->id());
515      const DisplayInfo& new_display_info = GetDisplayInfo(new_display.id());
516
517      bool host_window_bounds_changed =
518          current_display_info.bounds_in_pixel() !=
519          new_display_info.bounds_in_pixel();
520
521      if (force_bounds_changed_ ||
522          host_window_bounds_changed ||
523          (current_display.device_scale_factor() !=
524           new_display.device_scale_factor()) ||
525          (current_display_info.size_in_pixel() !=
526           new_display.GetSizeInPixel()) ||
527          (current_display.rotation() != new_display.rotation())) {
528
529        changed_display_indices.push_back(new_displays.size());
530      }
531
532      new_display.UpdateWorkAreaFromInsets(current_display.GetWorkAreaInsets());
533      new_displays.push_back(new_display);
534      ++curr_iter;
535      ++new_info_iter;
536    } else if (curr_iter->id() < new_info_iter->id()) {
537      // more displays in current list between ids, which means it is deleted.
538      removed_displays.push_back(*curr_iter);
539      ++curr_iter;
540    } else {
541      // more displays in new list between ids, which means it is added.
542      added_display_indices.push_back(new_displays.size());
543      InsertAndUpdateDisplayInfo(*new_info_iter);
544      new_displays.push_back(
545          CreateDisplayFromDisplayInfoById(new_info_iter->id()));
546      ++new_info_iter;
547    }
548  }
549
550  scoped_ptr<MirrorWindowCloser> mirror_window_closer;
551  // Try to close mirror window unless mirror window is necessary.
552  if (!mirror_window_creater.get())
553    mirror_window_closer.reset(new MirrorWindowCloser(delegate_));
554
555  // Do not update |displays_| if there's nothing to be updated. Without this,
556  // it will not update the display layout, which causes the bug
557  // http://crbug.com/155948.
558  if (changed_display_indices.empty() && added_display_indices.empty() &&
559      removed_displays.empty()) {
560    return;
561  }
562  if (delegate_)
563    delegate_->PreDisplayConfigurationChange();
564
565  size_t updated_index;
566  if (UpdateSecondaryDisplayBoundsForLayout(&new_displays, &updated_index) &&
567      std::find(added_display_indices.begin(),
568                added_display_indices.end(),
569                updated_index) == added_display_indices.end() &&
570      std::find(changed_display_indices.begin(),
571                changed_display_indices.end(),
572                updated_index) == changed_display_indices.end()) {
573    changed_display_indices.push_back(updated_index);
574  }
575
576  displays_ = new_displays;
577
578  base::AutoReset<bool> resetter(&change_display_upon_host_resize_, false);
579
580  // Temporarily add displays to be removed because display object
581  // being removed are accessed during shutting down the root.
582  displays_.insert(displays_.end(), removed_displays.begin(),
583                   removed_displays.end());
584
585  for (DisplayList::const_reverse_iterator iter = removed_displays.rbegin();
586       iter != removed_displays.rend(); ++iter) {
587    Shell::GetInstance()->screen()->NotifyDisplayRemoved(displays_.back());
588    displays_.pop_back();
589  }
590  // Close the mirror window here to avoid creating two compositor on
591  // one display.
592  mirror_window_closer.reset();
593  for (std::vector<size_t>::iterator iter = added_display_indices.begin();
594       iter != added_display_indices.end(); ++iter) {
595    Shell::GetInstance()->screen()->NotifyDisplayAdded(displays_[*iter]);
596  }
597  // Create the mirror window after all displays are added so that
598  // it can mirror the display newly added. This can happen when switching
599  // from dock mode to software mirror mode.
600  mirror_window_creater.reset();
601  for (std::vector<size_t>::iterator iter = changed_display_indices.begin();
602       iter != changed_display_indices.end(); ++iter) {
603    Shell::GetInstance()->screen()->NotifyBoundsChanged(displays_[*iter]);
604  }
605  if (delegate_)
606    delegate_->PostDisplayConfigurationChange();
607
608#if defined(USE_X11) && defined(OS_CHROMEOS)
609  if (!changed_display_indices.empty() && base::chromeos::IsRunningOnChromeOS())
610    ui::ClearX11DefaultRootWindow();
611#endif
612}
613
614const gfx::Display& DisplayManager::GetDisplayAt(size_t index) const {
615  DCHECK_LT(index, displays_.size());
616  return displays_[index];
617}
618
619const gfx::Display* DisplayManager::GetPrimaryDisplayCandidate() const {
620  const gfx::Display* primary_candidate = &displays_[0];
621#if defined(OS_CHROMEOS)
622  if (base::chromeos::IsRunningOnChromeOS()) {
623    // On ChromeOS device, root windows are stacked vertically, and
624    // default primary is the one on top.
625    int count = GetNumDisplays();
626    int y = GetDisplayInfo(primary_candidate->id()).bounds_in_pixel().y();
627    for (int i = 1; i < count; ++i) {
628      const gfx::Display* display = &displays_[i];
629      const DisplayInfo& display_info = GetDisplayInfo(display->id());
630      if (display->IsInternal()) {
631        primary_candidate = display;
632        break;
633      } else if (display_info.bounds_in_pixel().y() < y) {
634        primary_candidate = display;
635        y = display_info.bounds_in_pixel().y();
636      }
637    }
638  }
639#endif
640  return primary_candidate;
641}
642
643size_t DisplayManager::GetNumDisplays() const {
644  return displays_.size();
645}
646
647bool DisplayManager::IsMirrored() const {
648  return mirrored_display_.id() != gfx::Display::kInvalidDisplayID;
649}
650
651const DisplayInfo& DisplayManager::GetDisplayInfo(int64 display_id) const {
652  std::map<int64, DisplayInfo>::const_iterator iter =
653      display_info_.find(display_id);
654  CHECK(iter != display_info_.end()) << display_id;
655  return iter->second;
656}
657
658std::string DisplayManager::GetDisplayNameForId(int64 id) {
659  if (id == gfx::Display::kInvalidDisplayID)
660    return l10n_util::GetStringUTF8(IDS_ASH_STATUS_TRAY_UNKNOWN_DISPLAY_NAME);
661
662  std::map<int64, DisplayInfo>::const_iterator iter = display_info_.find(id);
663  if (iter != display_info_.end() && !iter->second.name().empty())
664    return iter->second.name();
665
666  return base::StringPrintf("Display %d", static_cast<int>(id));
667}
668
669int64 DisplayManager::GetDisplayIdForUIScaling() const {
670  // UI Scaling is effective only on internal display.
671  int64 display_id = gfx::Display::InternalDisplayId();
672#if defined(OS_WIN)
673  display_id = first_display_id();
674#endif
675  return display_id;
676}
677
678void DisplayManager::SetMirrorMode(bool mirrored) {
679  if (num_connected_displays() <= 1)
680    return;
681
682#if defined(OS_CHROMEOS)
683  if (base::chromeos::IsRunningOnChromeOS()) {
684    chromeos::OutputState new_state = mirrored ?
685        chromeos::STATE_DUAL_MIRROR : chromeos::STATE_DUAL_EXTENDED;
686    Shell::GetInstance()->output_configurator()->SetDisplayMode(new_state);
687    return;
688  }
689#endif
690  SetSoftwareMirroring(mirrored);
691  DisplayInfoList display_info_list;
692  int count = 0;
693  for (std::map<int64, DisplayInfo>::const_iterator iter =
694           display_info_.begin();
695       count < 2; ++iter, ++count) {
696    display_info_list.push_back(GetDisplayInfo(iter->second.id()));
697  }
698  UpdateDisplays(display_info_list);
699#if defined(OS_CHROMEOS)
700  if (Shell::GetInstance()->output_configurator_animation()) {
701    Shell::GetInstance()->output_configurator_animation()->
702        StartFadeInAnimation();
703  }
704#endif
705}
706
707void DisplayManager::AddRemoveDisplay() {
708  DCHECK(!displays_.empty());
709  std::vector<DisplayInfo> new_display_info_list;
710  DisplayInfo first_display = GetDisplayInfo(displays_[0].id());
711  new_display_info_list.push_back(first_display);
712  // Add if there is only one display connected.
713  if (num_connected_displays() == 1) {
714    // Layout the 2nd display below the primary as with the real device.
715    gfx::Rect host_bounds = first_display.bounds_in_pixel();
716    new_display_info_list.push_back(DisplayInfo::CreateFromSpec(
717        base::StringPrintf(
718            "%d+%d-500x400", host_bounds.x(), host_bounds.bottom())));
719  }
720  num_connected_displays_ = new_display_info_list.size();
721  mirrored_display_ = gfx::Display();
722  UpdateDisplays(new_display_info_list);
723}
724
725void DisplayManager::ToggleDisplayScaleFactor() {
726  DCHECK(!displays_.empty());
727  std::vector<DisplayInfo> new_display_info_list;
728  for (DisplayList::const_iterator iter = displays_.begin();
729       iter != displays_.end(); ++iter) {
730    DisplayInfo display_info = GetDisplayInfo(iter->id());
731    display_info.set_device_scale_factor(
732        display_info.device_scale_factor() == 1.0f ? 2.0f : 1.0f);
733    new_display_info_list.push_back(display_info);
734  }
735  AddMirrorDisplayInfoIfAny(&new_display_info_list);
736  UpdateDisplays(new_display_info_list);
737}
738
739void DisplayManager::SetSoftwareMirroring(bool enabled) {
740  software_mirroring_enabled_ = enabled;
741  mirrored_display_ = gfx::Display();
742}
743
744bool DisplayManager::UpdateDisplayBounds(int64 display_id,
745                                         const gfx::Rect& new_bounds) {
746  if (change_display_upon_host_resize_) {
747    display_info_[display_id].SetBounds(new_bounds);
748    // Don't notify observers if the mirrored window has changed.
749    if (software_mirroring_enabled_ && mirrored_display_.id() == display_id)
750      return false;
751    gfx::Display* display = FindDisplayForId(display_id);
752    display->SetSize(display_info_[display_id].size_in_pixel());
753    Shell::GetInstance()->screen()->NotifyBoundsChanged(*display);
754    return true;
755  }
756  return false;
757}
758
759gfx::Display* DisplayManager::FindDisplayForId(int64 id) {
760  for (DisplayList::iterator iter = displays_.begin();
761       iter != displays_.end(); ++iter) {
762    if ((*iter).id() == id)
763      return &(*iter);
764  }
765  DLOG(WARNING) << "Could not find display:" << id;
766  return NULL;
767}
768
769void DisplayManager::AddMirrorDisplayInfoIfAny(
770    std::vector<DisplayInfo>* display_info_list) {
771  if (software_mirroring_enabled_ && mirrored_display_.is_valid())
772    display_info_list->push_back(GetDisplayInfo(mirrored_display_.id()));
773}
774
775void DisplayManager::InsertAndUpdateDisplayInfo(const DisplayInfo& new_info) {
776  std::map<int64, DisplayInfo>::iterator info =
777      display_info_.find(new_info.id());
778  if (info != display_info_.end())
779    info->second.Copy(new_info);
780  else {
781    display_info_[new_info.id()] = new_info;
782    display_info_[new_info.id()].set_native(false);
783  }
784  display_info_[new_info.id()].UpdateDisplaySize();
785}
786
787gfx::Display DisplayManager::CreateDisplayFromDisplayInfoById(int64 id) {
788  DCHECK(display_info_.find(id) != display_info_.end());
789  const DisplayInfo& display_info = display_info_[id];
790
791  gfx::Display new_display(display_info.id());
792  gfx::Rect bounds_in_pixel(display_info.size_in_pixel());
793
794  // Simply set the origin to (0,0).  The primary display's origin is
795  // always (0,0) and the secondary display's bounds will be updated
796  // in |UpdateSecondaryDisplayBoundsForLayout| called in |UpdateDisplay|.
797  new_display.SetScaleAndBounds(
798      display_info.device_scale_factor(), gfx::Rect(bounds_in_pixel.size()));
799  new_display.set_rotation(display_info.rotation());
800  return new_display;
801}
802
803bool DisplayManager::UpdateSecondaryDisplayBoundsForLayout(
804    DisplayList* displays,
805    size_t* updated_index) const {
806  if (displays->size() != 2U)
807    return false;
808
809  int64 id_at_zero = displays->at(0).id();
810  DisplayIdPair pair =
811      (id_at_zero == first_display_id_ ||
812       id_at_zero == gfx::Display::InternalDisplayId()) ?
813      std::make_pair(id_at_zero, displays->at(1).id()) :
814      std::make_pair(displays->at(1).id(), id_at_zero) ;
815  DisplayLayout layout =
816      layout_store_->ComputeDisplayLayoutForDisplayIdPair(pair);
817
818  // Ignore if a user has a old format (should be extremely rare)
819  // and this will be replaced with DCHECK.
820  if (layout.primary_id != gfx::Display::kInvalidDisplayID) {
821    size_t primary_index, secondary_index;
822    if (displays->at(0).id() == layout.primary_id) {
823      primary_index = 0;
824      secondary_index = 1;
825    } else {
826      primary_index = 1;
827      secondary_index = 0;
828    }
829    gfx::Rect bounds =
830        GetDisplayForId(displays->at(secondary_index).id()).bounds();
831    UpdateDisplayBoundsForLayout(
832        layout, displays->at(primary_index), &displays->at(secondary_index));
833    *updated_index = secondary_index;
834    return bounds != displays->at(secondary_index).bounds();
835  }
836  return false;
837}
838
839// static
840void DisplayManager::UpdateDisplayBoundsForLayout(
841    const DisplayLayout& layout,
842    const gfx::Display& primary_display,
843    gfx::Display* secondary_display) {
844  DCHECK_EQ("0,0", primary_display.bounds().origin().ToString());
845
846  const gfx::Rect& primary_bounds = primary_display.bounds();
847  const gfx::Rect& secondary_bounds = secondary_display->bounds();
848  gfx::Point new_secondary_origin = primary_bounds.origin();
849
850  DisplayLayout::Position position = layout.position;
851
852  // Ignore the offset in case the secondary display doesn't share edges with
853  // the primary display.
854  int offset = layout.offset;
855  if (position == DisplayLayout::TOP || position == DisplayLayout::BOTTOM) {
856    offset = std::min(
857        offset, primary_bounds.width() - kMinimumOverlapForInvalidOffset);
858    offset = std::max(
859        offset, -secondary_bounds.width() + kMinimumOverlapForInvalidOffset);
860  } else {
861    offset = std::min(
862        offset, primary_bounds.height() - kMinimumOverlapForInvalidOffset);
863    offset = std::max(
864        offset, -secondary_bounds.height() + kMinimumOverlapForInvalidOffset);
865  }
866  switch (position) {
867    case DisplayLayout::TOP:
868      new_secondary_origin.Offset(offset, -secondary_bounds.height());
869      break;
870    case DisplayLayout::RIGHT:
871      new_secondary_origin.Offset(primary_bounds.width(), offset);
872      break;
873    case DisplayLayout::BOTTOM:
874      new_secondary_origin.Offset(offset, primary_bounds.height());
875      break;
876    case DisplayLayout::LEFT:
877      new_secondary_origin.Offset(-secondary_bounds.width(), offset);
878      break;
879  }
880  gfx::Insets insets = secondary_display->GetWorkAreaInsets();
881  secondary_display->set_bounds(
882      gfx::Rect(new_secondary_origin, secondary_bounds.size()));
883  secondary_display->UpdateWorkAreaFromInsets(insets);
884}
885
886}  // namespace internal
887}  // namespace ash
888