ash/display/display_change_observer_chromeos.cc

   1 // Copyright 2013 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_change_observer_chromeos.h"
   6
   7 #include <algorithm>
   8 #include <map>
   9 #include <set>
  10 #include <string>
  11 #include <utility>
  12 #include <vector>
  13
  14 #include "ash/ash_switches.h"
  15 #include "ash/display/display_info.h"
  16 #include "ash/display/display_layout_store.h"
  17 #include "ash/display/display_manager.h"
  18 #include "ash/display/display_util.h"
  19 #include "ash/shell.h"
  20 #include "ash/touch/touchscreen_util.h"
  21 #include "base/command_line.h"
  22 #include "base/logging.h"
  23 #include "grit/ash_strings.h"
  24 #include "ui/base/l10n/l10n_util.h"
  25 #include "ui/base/user_activity/user_activity_detector.h"
  26 #include "ui/compositor/dip_util.h"
  27 #include "ui/display/types/display_mode.h"
  28 #include "ui/display/types/display_snapshot.h"
  29 #include "ui/display/util/display_util.h"
  30 #include "ui/events/devices/device_data_manager.h"
  31 #include "ui/events/devices/touchscreen_device.h"
  32 #include "ui/gfx/display.h"
  33
  34 namespace ash {
  35
  36 using ui::DisplayConfigurator;
  37
  38 namespace {
  39
  40 // The DPI threshold to determine the device scale factor.
  41 // DPI higher than |dpi| will use |device_scale_factor|.
  42 struct DeviceScaleFactorDPIThreshold {
  43   float dpi;
  44   float device_scale_factor;
  45 };
  46
  47 const DeviceScaleFactorDPIThreshold kThresholdTable[] = {
  48   {200.0f, 2.0f},
  49   {150.0f, 1.25f},
  50   {0.0f, 1.0f},
  51 };
  52
  53 // 1 inch in mm.
  54 const float kInchInMm = 25.4f;
  55
  56 // The minimum pixel width whose monitor can be called as '4K'.
  57 const int kMinimumWidthFor4K = 3840;
  58
  59 // The list of device scale factors (in addition to 1.0f) which is
  60 // available in extrenal large monitors.
  61 const float kAdditionalDeviceScaleFactorsFor4k[] = {1.25f, 2.0f};
  62
  63 void UpdateInternalDisplayId(
  64     const ui::DisplayConfigurator::DisplayStateList& display_states) {
  65   for (auto* state : display_states) {
  66     if (state->type() == ui::DISPLAY_CONNECTION_TYPE_INTERNAL) {
  67       if (gfx::Display::HasInternalDisplay())
  68         DCHECK_EQ(gfx::Display::InternalDisplayId(), state->display_id());
  69       gfx::Display::SetInternalDisplayId(state->display_id());
  70     }
  71   }
  72 }
  73
  74 }  // namespace
  75
  76 // static
  77 std::vector<DisplayMode> DisplayChangeObserver::GetInternalDisplayModeList(
  78     const DisplayInfo& display_info,
  79     const ui::DisplaySnapshot& output) {
  80   const ui::DisplayMode* ui_native_mode = output.native_mode();
  81   DisplayMode native_mode(ui_native_mode->size(),
  82                           ui_native_mode->refresh_rate(),
  83                           ui_native_mode->is_interlaced(),
  84                           true);
  85   native_mode.device_scale_factor = display_info.device_scale_factor();
  86
  87   return CreateInternalDisplayModeList(native_mode);
  88 }
  89
  90 // static
  91 std::vector<DisplayMode> DisplayChangeObserver::GetExternalDisplayModeList(
  92     const ui::DisplaySnapshot& output) {
  93   typedef std::map<std::pair<int, int>, DisplayMode> DisplayModeMap;
  94   DisplayModeMap display_mode_map;
  95
  96   DisplayMode native_mode;
  97   for (const ui::DisplayMode* mode_info : output.modes()) {
  98     const std::pair<int, int> size(mode_info->size().width(),
  99                                    mode_info->size().height());
 100     const DisplayMode display_mode(mode_info->size(), mode_info->refresh_rate(),
 101                                    mode_info->is_interlaced(),
 102                                    output.native_mode() == mode_info);
 103     if (display_mode.native)
 104       native_mode = display_mode;
 105
 106     // Add the display mode if it isn't already present and override interlaced
 107     // display modes with non-interlaced ones.
 108     DisplayModeMap::iterator display_mode_it = display_mode_map.find(size);
 109     if (display_mode_it == display_mode_map.end())
 110       display_mode_map.insert(std::make_pair(size, display_mode));
 111     else if (display_mode_it->second.interlaced && !display_mode.interlaced)
 112       display_mode_it->second = display_mode;
 113   }
 114
 115   std::vector<DisplayMode> display_mode_list;
 116   for (const auto& display_mode_pair : display_mode_map)
 117     display_mode_list.push_back(display_mode_pair.second);
 118
 119   if (output.native_mode()) {
 120     const std::pair<int, int> size(native_mode.size.width(),
 121                                    native_mode.size.height());
 122     DisplayModeMap::iterator it = display_mode_map.find(size);
 123     DCHECK(it != display_mode_map.end())
 124         << "Native mode must be part of the mode list.";
 125
 126     // If the native mode was replaced re-add it.
 127     if (!it->second.native)
 128       display_mode_list.push_back(native_mode);
 129   }
 130
 131   if (native_mode.size.width() >= kMinimumWidthFor4K) {
 132     for (size_t i = 0; i < arraysize(kAdditionalDeviceScaleFactorsFor4k);
 133          ++i) {
 134       DisplayMode mode = native_mode;
 135       mode.device_scale_factor = kAdditionalDeviceScaleFactorsFor4k[i];
 136       mode.native = false;
 137       display_mode_list.push_back(mode);
 138     }
 139   }
 140
 141   return display_mode_list;
 142 }
 143
 144 DisplayChangeObserver::DisplayChangeObserver() {
 145   Shell::GetInstance()->AddShellObserver(this);
 146   ui::DeviceDataManager::GetInstance()->AddObserver(this);
 147 }
 148
 149 DisplayChangeObserver::~DisplayChangeObserver() {
 150   ui::DeviceDataManager::GetInstance()->RemoveObserver(this);
 151   Shell::GetInstance()->RemoveShellObserver(this);
 152 }
 153
 154 ui::MultipleDisplayState DisplayChangeObserver::GetStateForDisplayIds(
 155     const ui::DisplayConfigurator::DisplayStateList& display_states) const {
 156   UpdateInternalDisplayId(display_states);
 157   if (display_states.size() != 2)
 158     return ui::MULTIPLE_DISPLAY_STATE_DUAL_EXTENDED;
 159   DisplayIdPair pair = CreateDisplayIdPair(display_states[0]->display_id(),
 160                                            display_states[1]->display_id());
 161   DisplayLayout layout = Shell::GetInstance()->display_manager()->
 162       layout_store()->GetRegisteredDisplayLayout(pair);
 163   return layout.mirrored ? ui::MULTIPLE_DISPLAY_STATE_DUAL_MIRROR :
 164                            ui::MULTIPLE_DISPLAY_STATE_DUAL_EXTENDED;
 165 }
 166
 167 bool DisplayChangeObserver::GetResolutionForDisplayId(int64 display_id,
 168                                                       gfx::Size* size) const {
 169   DisplayMode mode;
 170   if (!Shell::GetInstance()->display_manager()->GetSelectedModeForDisplayId(
 171            display_id, &mode))
 172     return false;
 173
 174   *size = mode.size;
 175   return true;
 176 }
 177
 178 void DisplayChangeObserver::OnDisplayModeChanged(
 179     const ui::DisplayConfigurator::DisplayStateList& display_states) {
 180   UpdateInternalDisplayId(display_states);
 181
 182   std::vector<DisplayInfo> displays;
 183   std::set<int64> ids;
 184   for (const ui::DisplaySnapshot* state : display_states) {
 185     const ui::DisplayMode* mode_info = state->current_mode();
 186     if (!mode_info)
 187       continue;
 188
 189     float device_scale_factor = 1.0f;
 190     // Sets dpi only if the screen size is not blacklisted.
 191     float dpi = ui::IsDisplaySizeBlackListed(state->physical_size())
 192                     ? 0
 193                     : kInchInMm * mode_info->size().width() /
 194                           state->physical_size().width();
 195     if (state->type() == ui::DISPLAY_CONNECTION_TYPE_INTERNAL) {
 196       if (dpi)
 197         device_scale_factor = FindDeviceScaleFactor(dpi);
 198     } else {
 199       DisplayMode mode;
 200       if (Shell::GetInstance()->display_manager()->GetSelectedModeForDisplayId(
 201               state->display_id(), &mode)) {
 202         device_scale_factor = mode.device_scale_factor;
 203       } else {
 204         // For monitors that are 40 inches and 4K or above, set
 205         // |device_scale_factor| to 2x. For margin purposes, 100 is subtracted
 206         // from the value of |k2xThreshouldSizeSquaredFor4KInMm|
 207         const int k2xThreshouldSizeSquaredFor4KInMm =
 208             (40 * 40 * kInchInMm * kInchInMm) - 100;
 209         gfx::Vector2d size_in_vec(state->physical_size().width(),
 210                                   state->physical_size().height());
 211         if (size_in_vec.LengthSquared() > k2xThreshouldSizeSquaredFor4KInMm &&
 212             mode_info->size().width() >= kMinimumWidthFor4K) {
 213           // Make sure that additional device scale factors table has 2x.
 214           DCHECK_EQ(2.0f, kAdditionalDeviceScaleFactorsFor4k[1]);
 215           device_scale_factor = 2.0f;
 216         }
 217       }
 218     }
 219     gfx::Rect display_bounds(state->origin(), mode_info->size());
 220
 221     std::string name =
 222         state->type() == ui::DISPLAY_CONNECTION_TYPE_INTERNAL
 223             ? l10n_util::GetStringUTF8(IDS_ASH_INTERNAL_DISPLAY_NAME)
 224             : state->display_name();
 225     if (name.empty())
 226       name = l10n_util::GetStringUTF8(IDS_ASH_STATUS_TRAY_UNKNOWN_DISPLAY_NAME);
 227
 228     bool has_overscan = state->has_overscan();
 229     int64 id = state->display_id();
 230     ids.insert(id);
 231
 232     displays.push_back(DisplayInfo(id, name, has_overscan));
 233     DisplayInfo& new_info = displays.back();
 234     new_info.set_device_scale_factor(device_scale_factor);
 235     new_info.SetBounds(display_bounds);
 236     new_info.set_native(true);
 237     new_info.set_is_aspect_preserving_scaling(
 238         state->is_aspect_preserving_scaling());
 239     if (dpi)
 240       new_info.set_device_dpi(dpi);
 241
 242     std::vector<DisplayMode> display_modes =
 243         (state->type() == ui::DISPLAY_CONNECTION_TYPE_INTERNAL)
 244             ? GetInternalDisplayModeList(new_info, *state)
 245             : GetExternalDisplayModeList(*state);
 246     new_info.SetDisplayModes(display_modes);
 247
 248     new_info.set_available_color_profiles(
 249         Shell::GetInstance()
 250             ->display_configurator()
 251             ->GetAvailableColorCalibrationProfiles(id));
 252   }
 253
 254   AssociateTouchscreens(
 255       &displays, ui::DeviceDataManager::GetInstance()->touchscreen_devices());
 256   // DisplayManager can be null during the boot.
 257   Shell::GetInstance()->display_manager()->OnNativeDisplaysChanged(displays);
 258
 259   // For the purposes of user activity detection, ignore synthetic mouse events
 260   // that are triggered by screen resizes: http://crbug.com/360634
 261   ui::UserActivityDetector* user_activity_detector =
 262       ui::UserActivityDetector::Get();
 263   if (user_activity_detector)
 264     user_activity_detector->OnDisplayPowerChanging();
 265 }
 266
 267 void DisplayChangeObserver::OnDisplayModeChangeFailed(
 268     const ui::DisplayConfigurator::DisplayStateList& displays,
 269     ui::MultipleDisplayState failed_new_state) {
 270   // If display configuration failed during startup, simply update the display
 271   // manager with detected displays. If no display is detected, it will
 272   // create a pseudo display.
 273   if (Shell::GetInstance()->display_manager()->GetNumDisplays() == 0)
 274     OnDisplayModeChanged(displays);
 275 }
 276
 277 void DisplayChangeObserver::OnAppTerminating() {
 278 #if defined(USE_ASH)
 279   // Stop handling display configuration events once the shutdown
 280   // process starts. crbug.com/177014.
 281   Shell::GetInstance()->display_configurator()->PrepareForExit();
 282 #endif
 283 }
 284
 285 // static
 286 float DisplayChangeObserver::FindDeviceScaleFactor(float dpi) {
 287   for (size_t i = 0; i < arraysize(kThresholdTable); ++i) {
 288     if (dpi > kThresholdTable[i].dpi)
 289       return kThresholdTable[i].device_scale_factor;
 290   }
 291   return 1.0f;
 292 }
 293
 294 void DisplayChangeObserver::OnTouchscreenDeviceConfigurationChanged() {
 295   OnDisplayModeChanged(
 296       Shell::GetInstance()->display_configurator()->cached_displays());
 297 }
 298
 299 }  // namespace ash