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 }  // namespace
  64
  65 // static
  66 std::vector<DisplayMode> DisplayChangeObserver::GetInternalDisplayModeList(
  67     const DisplayInfo& display_info,
  68     const ui::DisplaySnapshot& output) {
  69   const ui::DisplayMode* ui_native_mode = output.native_mode();
  70   DisplayMode native_mode(ui_native_mode->size(),
  71                           ui_native_mode->refresh_rate(),
  72                           ui_native_mode->is_interlaced(),
  73                           true);
  74   native_mode.device_scale_factor = display_info.device_scale_factor();
  75
  76   return CreateInternalDisplayModeList(native_mode);
  77 }
  78
  79 // static
  80 std::vector<DisplayMode> DisplayChangeObserver::GetExternalDisplayModeList(
  81     const ui::DisplaySnapshot& output) {
  82   typedef std::map<std::pair<int, int>, DisplayMode> DisplayModeMap;
  83   DisplayModeMap display_mode_map;
  84
  85   DisplayMode native_mode;
  86   for (const ui::DisplayMode* mode_info : output.modes()) {
  87     const std::pair<int, int> size(mode_info->size().width(),
  88                                    mode_info->size().height());
  89     const DisplayMode display_mode(mode_info->size(), mode_info->refresh_rate(),
  90                                    mode_info->is_interlaced(),
  91                                    output.native_mode() == mode_info);
  92     if (display_mode.native)
  93       native_mode = display_mode;
  94
  95     // Add the display mode if it isn't already present and override interlaced
  96     // display modes with non-interlaced ones.
  97     DisplayModeMap::iterator display_mode_it = display_mode_map.find(size);
  98     if (display_mode_it == display_mode_map.end())
  99       display_mode_map.insert(std::make_pair(size, display_mode));
 100     else if (display_mode_it->second.interlaced && !display_mode.interlaced)
 101       display_mode_it->second = display_mode;
 102   }
 103
 104   std::vector<DisplayMode> display_mode_list;
 105   for (const auto& display_mode_pair : display_mode_map)
 106     display_mode_list.push_back(display_mode_pair.second);
 107
 108   if (output.native_mode()) {
 109     const std::pair<int, int> size(native_mode.size.width(),
 110                                    native_mode.size.height());
 111     DisplayModeMap::iterator it = display_mode_map.find(size);
 112     DCHECK(it != display_mode_map.end())
 113         << "Native mode must be part of the mode list.";
 114
 115     // If the native mode was replaced re-add it.
 116     if (!it->second.native)
 117       display_mode_list.push_back(native_mode);
 118   }
 119
 120   if (native_mode.size.width() >= kMinimumWidthFor4K) {
 121     for (size_t i = 0; i < arraysize(kAdditionalDeviceScaleFactorsFor4k);
 122          ++i) {
 123       DisplayMode mode = native_mode;
 124       mode.device_scale_factor = kAdditionalDeviceScaleFactorsFor4k[i];
 125       mode.native = false;
 126       display_mode_list.push_back(mode);
 127     }
 128   }
 129
 130   return display_mode_list;
 131 }
 132
 133 DisplayChangeObserver::DisplayChangeObserver() {
 134   Shell::GetInstance()->AddShellObserver(this);
 135   ui::DeviceDataManager::GetInstance()->AddObserver(this);
 136 }
 137
 138 DisplayChangeObserver::~DisplayChangeObserver() {
 139   ui::DeviceDataManager::GetInstance()->RemoveObserver(this);
 140   Shell::GetInstance()->RemoveShellObserver(this);
 141 }
 142
 143 ui::MultipleDisplayState DisplayChangeObserver::GetStateForDisplayIds(
 144     const std::vector<int64>& display_ids) const {
 145   CHECK_EQ(2U, display_ids.size());
 146   DisplayIdPair pair = std::make_pair(display_ids[0], display_ids[1]);
 147   DisplayLayout layout = Shell::GetInstance()->display_manager()->
 148       layout_store()->GetRegisteredDisplayLayout(pair);
 149   return layout.mirrored ? ui::MULTIPLE_DISPLAY_STATE_DUAL_MIRROR :
 150                            ui::MULTIPLE_DISPLAY_STATE_DUAL_EXTENDED;
 151 }
 152
 153 bool DisplayChangeObserver::GetResolutionForDisplayId(int64 display_id,
 154                                                       gfx::Size* size) const {
 155   DisplayMode mode;
 156   if (!Shell::GetInstance()->display_manager()->GetSelectedModeForDisplayId(
 157            display_id, &mode))
 158     return false;
 159
 160   *size = mode.size;
 161   return true;
 162 }
 163
 164 void DisplayChangeObserver::OnDisplayModeChanged(
 165     const ui::DisplayConfigurator::DisplayStateList& display_states) {
 166   std::vector<DisplayInfo> displays;
 167   std::set<int64> ids;
 168   for (const ui::DisplaySnapshot* state : display_states) {
 169     if (state->type() == ui::DISPLAY_CONNECTION_TYPE_INTERNAL) {
 170       if (!gfx::Display::HasInternalDisplay()) {
 171         gfx::Display::SetInternalDisplayId(state->display_id());
 172       } else {
 173 #if defined(USE_OZONE)
 174         // TODO(dnicoara) Remove when Ozone can properly perform the initial
 175         // display configuration.
 176         gfx::Display::SetInternalDisplayId(state->display_id());
 177 #endif
 178         DCHECK_EQ(gfx::Display::InternalDisplayId(), state->display_id());
 179       }
 180     }
 181
 182     const ui::DisplayMode* mode_info = state->current_mode();
 183     if (!mode_info)
 184       continue;
 185
 186     float device_scale_factor = 1.0f;
 187     if (state->type() == ui::DISPLAY_CONNECTION_TYPE_INTERNAL) {
 188       if (!ui::IsDisplaySizeBlackListed(state->physical_size())) {
 189         device_scale_factor =
 190             FindDeviceScaleFactor((kInchInMm * mode_info->size().width() /
 191                                    state->physical_size().width()));
 192       }
 193     } else {
 194       DisplayMode mode;
 195       if (Shell::GetInstance()->display_manager()->GetSelectedModeForDisplayId(
 196               state->display_id(), &mode)) {
 197         device_scale_factor = mode.device_scale_factor;
 198       } else {
 199         // For monitors that are 40 inches and 4K or above, set
 200         // |device_scale_factor| to 2x. For margin purposes, 100 is subtracted
 201         // from the value of |k2xThreshouldSizeSquaredFor4KInMm|
 202         const int k2xThreshouldSizeSquaredFor4KInMm =
 203             (40 * 40 * kInchInMm * kInchInMm) - 100;
 204         gfx::Vector2d size_in_vec(state->physical_size().width(),
 205                                   state->physical_size().height());
 206         if (size_in_vec.LengthSquared() > k2xThreshouldSizeSquaredFor4KInMm &&
 207             mode_info->size().width() >= kMinimumWidthFor4K) {
 208           // Make sure that additional device scale factors table has 2x.
 209           DCHECK_EQ(2.0f, kAdditionalDeviceScaleFactorsFor4k[1]);
 210           device_scale_factor = 2.0f;
 211         }
 212       }
 213     }
 214     gfx::Rect display_bounds(state->origin(), mode_info->size());
 215
 216     std::string name =
 217         state->type() == ui::DISPLAY_CONNECTION_TYPE_INTERNAL
 218             ? l10n_util::GetStringUTF8(IDS_ASH_INTERNAL_DISPLAY_NAME)
 219             : state->display_name();
 220     if (name.empty())
 221       name = l10n_util::GetStringUTF8(IDS_ASH_STATUS_TRAY_UNKNOWN_DISPLAY_NAME);
 222
 223     bool has_overscan = state->has_overscan();
 224     int64 id = state->display_id();
 225     ids.insert(id);
 226
 227     displays.push_back(DisplayInfo(id, name, has_overscan));
 228     DisplayInfo& new_info = displays.back();
 229     new_info.set_device_scale_factor(device_scale_factor);
 230     new_info.SetBounds(display_bounds);
 231     new_info.set_native(true);
 232     new_info.set_is_aspect_preserving_scaling(
 233         state->is_aspect_preserving_scaling());
 234
 235     std::vector<DisplayMode> display_modes =
 236         (state->type() == ui::DISPLAY_CONNECTION_TYPE_INTERNAL)
 237             ? GetInternalDisplayModeList(new_info, *state)
 238             : GetExternalDisplayModeList(*state);
 239     new_info.SetDisplayModes(display_modes);
 240
 241     new_info.set_available_color_profiles(
 242         Shell::GetInstance()
 243             ->display_configurator()
 244             ->GetAvailableColorCalibrationProfiles(id));
 245   }
 246
 247   AssociateTouchscreens(
 248       &displays, ui::DeviceDataManager::GetInstance()->touchscreen_devices());
 249   // DisplayManager can be null during the boot.
 250   Shell::GetInstance()->display_manager()->OnNativeDisplaysChanged(displays);
 251
 252   // For the purposes of user activity detection, ignore synthetic mouse events
 253   // that are triggered by screen resizes: http://crbug.com/360634
 254   ui::UserActivityDetector* user_activity_detector =
 255       ui::UserActivityDetector::Get();
 256   if (user_activity_detector)
 257     user_activity_detector->OnDisplayPowerChanging();
 258 }
 259
 260 void DisplayChangeObserver::OnDisplayModeChangeFailed(
 261     const ui::DisplayConfigurator::DisplayStateList& displays,
 262     ui::MultipleDisplayState failed_new_state) {
 263   // If display configuration failed during startup, simply update the display
 264   // manager with detected displays. If no display is detected, it will
 265   // create a pseudo display.
 266   if (Shell::GetInstance()->display_manager()->GetNumDisplays() == 0)
 267     OnDisplayModeChanged(displays);
 268 }
 269
 270 void DisplayChangeObserver::OnAppTerminating() {
 271 #if defined(USE_ASH)
 272   // Stop handling display configuration events once the shutdown
 273   // process starts. crbug.com/177014.
 274   Shell::GetInstance()->display_configurator()->PrepareForExit();
 275 #endif
 276 }
 277
 278 // static
 279 float DisplayChangeObserver::FindDeviceScaleFactor(float dpi) {
 280   for (size_t i = 0; i < arraysize(kThresholdTable); ++i) {
 281     if (dpi > kThresholdTable[i].dpi)
 282       return kThresholdTable[i].device_scale_factor;
 283   }
 284   return 1.0f;
 285 }
 286
 287 void DisplayChangeObserver::OnTouchscreenDeviceConfigurationChanged() {
 288   OnDisplayModeChanged(
 289       Shell::GetInstance()->display_configurator()->cached_displays());
 290 }
 291
 292 }  // namespace ash