chromeos/display/output_configurator.cc

   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 "chromeos/display/output_configurator.h"
   6
   7 #include <X11/Xlib.h>
   8 #include <X11/extensions/Xrandr.h>
   9 #include <X11/extensions/XInput2.h>
  10
  11 #include "base/bind.h"
  12 #include "base/logging.h"
  13 #include "base/strings/string_number_conversions.h"
  14 #include "base/strings/stringprintf.h"
  15 #include "base/sys_info.h"
  16 #include "base/time/time.h"
  17 #include "chromeos/display/output_util.h"
  18 #include "chromeos/display/real_output_configurator_delegate.h"
  19
  20 namespace chromeos {
  21
  22 namespace {
  23
  24 // The delay to perform configuration after RRNotify.  See the comment
  25 // in |Dispatch()|.
  26 const int64 kConfigureDelayMs = 500;
  27
  28 // Returns a string describing |state|.
  29 std::string DisplayPowerStateToString(DisplayPowerState state) {
  30   switch (state) {
  31     case DISPLAY_POWER_ALL_ON:
  32       return "ALL_ON";
  33     case DISPLAY_POWER_ALL_OFF:
  34       return "ALL_OFF";
  35     case DISPLAY_POWER_INTERNAL_OFF_EXTERNAL_ON:
  36       return "INTERNAL_OFF_EXTERNAL_ON";
  37     case DISPLAY_POWER_INTERNAL_ON_EXTERNAL_OFF:
  38       return "INTERNAL_ON_EXTERNAL_OFF";
  39     default:
  40       return "unknown (" + base::IntToString(state) + ")";
  41   }
  42 }
  43
  44 // Returns a string describing |state|.
  45 std::string OutputStateToString(OutputState state) {
  46   switch (state) {
  47     case STATE_INVALID:
  48       return "INVALID";
  49     case STATE_HEADLESS:
  50       return "HEADLESS";
  51     case STATE_SINGLE:
  52       return "SINGLE";
  53     case STATE_DUAL_MIRROR:
  54       return "DUAL_MIRROR";
  55     case STATE_DUAL_EXTENDED:
  56       return "DUAL_EXTENDED";
  57   }
  58   NOTREACHED() << "Unknown state " << state;
  59   return "INVALID";
  60 }
  61
  62 // Returns a string representation of OutputSnapshot.
  63 std::string OutputSnapshotToString(
  64     const OutputConfigurator::OutputSnapshot* output) {
  65   return base::StringPrintf(
  66       "[type=%d, output=%ld, crtc=%ld, mode=%ld, dim=%dx%d]",
  67       output->type,
  68       output->output,
  69       output->crtc,
  70       output->current_mode,
  71       static_cast<int>(output->width_mm),
  72       static_cast<int>(output->height_mm));
  73 }
  74
  75 // Returns a string representation of ModeInfo.
  76 std::string ModeInfoToString(const OutputConfigurator::ModeInfo* mode) {
  77   return base::StringPrintf("[%dx%d %srate=%f]",
  78                             mode->width,
  79                             mode->height,
  80                             mode->interlaced ? "interlaced " : "",
  81                             mode->refresh_rate);
  82
  83 }
  84
  85 // Returns the number of outputs in |outputs| that should be turned on, per
  86 // |state|.  If |output_power| is non-NULL, it is updated to contain the
  87 // on/off state of each corresponding entry in |outputs|.
  88 int GetOutputPower(
  89     const std::vector<OutputConfigurator::OutputSnapshot>& outputs,
  90     DisplayPowerState state,
  91     std::vector<bool>* output_power) {
  92   int num_on_outputs = 0;
  93   if (output_power)
  94     output_power->resize(outputs.size());
  95
  96   for (size_t i = 0; i < outputs.size(); ++i) {
  97     bool internal = outputs[i].is_internal;
  98     bool on = state == DISPLAY_POWER_ALL_ON ||
  99         (state == DISPLAY_POWER_INTERNAL_OFF_EXTERNAL_ON && !internal) ||
 100         (state == DISPLAY_POWER_INTERNAL_ON_EXTERNAL_OFF && internal);
 101     if (output_power)
 102       (*output_power)[i] = on;
 103     if (on)
 104       num_on_outputs++;
 105   }
 106   return num_on_outputs;
 107 }
 108
 109 // Determine if there is an "internal" output and how many outputs are
 110 // connected.
 111 bool IsProjecting(
 112     const std::vector<OutputConfigurator::OutputSnapshot>& outputs) {
 113   bool has_internal_output = false;
 114   int connected_output_count = outputs.size();
 115   for (size_t i = 0; i < outputs.size(); ++i)
 116     has_internal_output |= outputs[i].is_internal;
 117
 118   // "Projecting" is defined as having more than 1 output connected while at
 119   // least one of them is an internal output.
 120   return has_internal_output && (connected_output_count > 1);
 121 }
 122
 123 }  // namespace
 124
 125 OutputConfigurator::ModeInfo::ModeInfo()
 126     : width(0),
 127       height(0),
 128       interlaced(false),
 129       refresh_rate(0.0) {}
 130
 131 OutputConfigurator::ModeInfo::ModeInfo(int width,
 132                                        int height,
 133                                        bool interlaced,
 134                                        float refresh_rate)
 135     : width(width),
 136       height(height),
 137       interlaced(interlaced),
 138       refresh_rate(refresh_rate) {}
 139
 140 OutputConfigurator::CoordinateTransformation::CoordinateTransformation()
 141     : x_scale(1.0),
 142       x_offset(0.0),
 143       y_scale(1.0),
 144       y_offset(0.0) {}
 145
 146 OutputConfigurator::OutputSnapshot::OutputSnapshot()
 147     : output(None),
 148       crtc(None),
 149       current_mode(None),
 150       native_mode(None),
 151       mirror_mode(None),
 152       selected_mode(None),
 153       x(0),
 154       y(0),
 155       width_mm(0),
 156       height_mm(0),
 157       is_internal(false),
 158       is_aspect_preserving_scaling(false),
 159       type(OUTPUT_TYPE_UNKNOWN),
 160       touch_device_id(0),
 161       display_id(0),
 162       has_display_id(false),
 163       index(0) {}
 164
 165 OutputConfigurator::OutputSnapshot::~OutputSnapshot() {}
 166
 167 void OutputConfigurator::TestApi::SendScreenChangeEvent() {
 168   XRRScreenChangeNotifyEvent event = {0};
 169   event.type = xrandr_event_base_ + RRScreenChangeNotify;
 170   configurator_->Dispatch(reinterpret_cast<const base::NativeEvent>(&event));
 171 }
 172
 173 void OutputConfigurator::TestApi::SendOutputChangeEvent(RROutput output,
 174                                                         RRCrtc crtc,
 175                                                         RRMode mode,
 176                                                         bool connected) {
 177   XRROutputChangeNotifyEvent event = {0};
 178   event.type = xrandr_event_base_ + RRNotify;
 179   event.subtype = RRNotify_OutputChange;
 180   event.output = output;
 181   event.crtc = crtc;
 182   event.mode = mode;
 183   event.connection = connected ? RR_Connected : RR_Disconnected;
 184   configurator_->Dispatch(reinterpret_cast<const base::NativeEvent>(&event));
 185 }
 186
 187 bool OutputConfigurator::TestApi::TriggerConfigureTimeout() {
 188   if (configurator_->configure_timer_.get() &&
 189       configurator_->configure_timer_->IsRunning()) {
 190     configurator_->configure_timer_.reset();
 191     configurator_->ConfigureOutputs();
 192     return true;
 193   } else {
 194     return false;
 195   }
 196 }
 197
 198 // static
 199 const OutputConfigurator::ModeInfo* OutputConfigurator::GetModeInfo(
 200     const OutputSnapshot& output,
 201     RRMode mode) {
 202   if (mode == None)
 203     return NULL;
 204
 205   ModeInfoMap::const_iterator it = output.mode_infos.find(mode);
 206   if (it == output.mode_infos.end()) {
 207     LOG(WARNING) << "Unable to find info about mode " << mode
 208                  << " for output " << output.output;
 209     return NULL;
 210   }
 211   return &it->second;
 212 }
 213
 214 // static
 215 RRMode OutputConfigurator::FindOutputModeMatchingSize(
 216     const OutputSnapshot& output,
 217     int width,
 218     int height) {
 219   RRMode found = None;
 220   float best_rate = 0;
 221   bool non_interlaced_found = false;
 222   for (ModeInfoMap::const_iterator it = output.mode_infos.begin();
 223        it != output.mode_infos.end(); ++it) {
 224     RRMode mode = it->first;
 225     const ModeInfo& info = it->second;
 226
 227     if (info.width == width && info.height == height) {
 228       if (info.interlaced) {
 229         if (non_interlaced_found)
 230           continue;
 231       } else {
 232         // Reset the best rate if the non interlaced is
 233         // found the first time.
 234         if (!non_interlaced_found)
 235           best_rate = info.refresh_rate;
 236         non_interlaced_found = true;
 237       }
 238       if (info.refresh_rate < best_rate)
 239         continue;
 240
 241       found = mode;
 242       best_rate = info.refresh_rate;
 243     }
 244   }
 245   return found;
 246 }
 247
 248 OutputConfigurator::OutputConfigurator()
 249     : state_controller_(NULL),
 250       mirroring_controller_(NULL),
 251       is_panel_fitting_enabled_(false),
 252       configure_display_(base::SysInfo::IsRunningOnChromeOS()),
 253       xrandr_event_base_(0),
 254       output_state_(STATE_INVALID),
 255       power_state_(DISPLAY_POWER_ALL_ON),
 256       next_output_protection_client_id_(1) {
 257 }
 258
 259 OutputConfigurator::~OutputConfigurator() {}
 260
 261 void OutputConfigurator::SetDelegateForTesting(scoped_ptr<Delegate> delegate) {
 262   delegate_ = delegate.Pass();
 263   configure_display_ = true;
 264 }
 265
 266 void OutputConfigurator::SetInitialDisplayPower(DisplayPowerState power_state) {
 267   DCHECK_EQ(output_state_, STATE_INVALID);
 268   power_state_ = power_state;
 269 }
 270
 271 void OutputConfigurator::Init(bool is_panel_fitting_enabled) {
 272   is_panel_fitting_enabled_ = is_panel_fitting_enabled;
 273   if (!configure_display_)
 274     return;
 275
 276   if (!delegate_)
 277     delegate_.reset(new RealOutputConfiguratorDelegate());
 278 }
 279
 280 void OutputConfigurator::Start(uint32 background_color_argb) {
 281   if (!configure_display_)
 282     return;
 283
 284   delegate_->GrabServer();
 285   delegate_->InitXRandRExtension(&xrandr_event_base_);
 286
 287   UpdateCachedOutputs();
 288   if (cached_outputs_.size() > 1 && background_color_argb)
 289     delegate_->SetBackgroundColor(background_color_argb);
 290   const OutputState new_state = ChooseOutputState(power_state_);
 291   const bool success = EnterStateOrFallBackToSoftwareMirroring(
 292       new_state, power_state_);
 293
 294   // Force the DPMS on chrome startup as the driver doesn't always detect
 295   // that all displays are on when signing out.
 296   delegate_->ForceDPMSOn();
 297   delegate_->UngrabServer();
 298   delegate_->SendProjectingStateToPowerManager(IsProjecting(cached_outputs_));
 299   NotifyObservers(success, new_state);
 300 }
 301
 302 bool OutputConfigurator::ApplyProtections(const DisplayProtections& requests) {
 303   for (std::vector<OutputSnapshot>::const_iterator it = cached_outputs_.begin();
 304        it != cached_outputs_.end(); ++it) {
 305     RROutput this_id = it->output;
 306     uint32_t all_desired = 0;
 307     DisplayProtections::const_iterator request_it = requests.find(
 308         it->display_id);
 309     if (request_it != requests.end())
 310       all_desired = request_it->second;
 311     switch (it->type) {
 312       case OUTPUT_TYPE_UNKNOWN:
 313         return false;
 314       // DisplayPort, DVI, and HDMI all support HDCP.
 315       case OUTPUT_TYPE_DISPLAYPORT:
 316       case OUTPUT_TYPE_DVI:
 317       case OUTPUT_TYPE_HDMI: {
 318         HDCPState new_desired_state =
 319             (all_desired & OUTPUT_PROTECTION_METHOD_HDCP) ?
 320             HDCP_STATE_DESIRED : HDCP_STATE_UNDESIRED;
 321         if (!delegate_->SetHDCPState(this_id, new_desired_state))
 322           return false;
 323         break;
 324       }
 325       case OUTPUT_TYPE_INTERNAL:
 326       case OUTPUT_TYPE_VGA:
 327       case OUTPUT_TYPE_NETWORK:
 328         // No protections for these types. Do nothing.
 329         break;
 330       case OUTPUT_TYPE_NONE:
 331         NOTREACHED();
 332         break;
 333     }
 334   }
 335
 336   return true;
 337 }
 338
 339 OutputConfigurator::OutputProtectionClientId
 340 OutputConfigurator::RegisterOutputProtectionClient() {
 341   if (!configure_display_)
 342     return kInvalidClientId;
 343
 344   return next_output_protection_client_id_++;
 345 }
 346
 347 void OutputConfigurator::UnregisterOutputProtectionClient(
 348     OutputProtectionClientId client_id) {
 349   client_protection_requests_.erase(client_id);
 350
 351   DisplayProtections protections;
 352   for (ProtectionRequests::const_iterator it =
 353            client_protection_requests_.begin();
 354        it != client_protection_requests_.end();
 355        ++it) {
 356     for (DisplayProtections::const_iterator it2 = it->second.begin();
 357        it2 != it->second.end(); ++it2) {
 358       protections[it2->first] |= it2->second;
 359     }
 360   }
 361
 362   ApplyProtections(protections);
 363 }
 364
 365 bool OutputConfigurator::QueryOutputProtectionStatus(
 366     OutputProtectionClientId client_id,
 367     int64 display_id,
 368     uint32_t* link_mask,
 369     uint32_t* protection_mask) {
 370   if (!configure_display_)
 371     return false;
 372
 373   uint32_t enabled = 0;
 374   uint32_t unfulfilled = 0;
 375   *link_mask = 0;
 376   for (std::vector<OutputSnapshot>::const_iterator it = cached_outputs_.begin();
 377        it != cached_outputs_.end(); ++it) {
 378     RROutput this_id = it->output;
 379     if (it->display_id != display_id)
 380       continue;
 381     *link_mask |= it->type;
 382     switch (it->type) {
 383       case OUTPUT_TYPE_UNKNOWN:
 384         return false;
 385       // DisplayPort, DVI, and HDMI all support HDCP.
 386       case OUTPUT_TYPE_DISPLAYPORT:
 387       case OUTPUT_TYPE_DVI:
 388       case OUTPUT_TYPE_HDMI: {
 389         HDCPState state;
 390         if (!delegate_->GetHDCPState(this_id, &state))
 391           return false;
 392         if (state == HDCP_STATE_ENABLED)
 393           enabled |= OUTPUT_PROTECTION_METHOD_HDCP;
 394         else
 395           unfulfilled |= OUTPUT_PROTECTION_METHOD_HDCP;
 396         break;
 397       }
 398       case OUTPUT_TYPE_INTERNAL:
 399       case OUTPUT_TYPE_VGA:
 400       case OUTPUT_TYPE_NETWORK:
 401         // No protections for these types. Do nothing.
 402         break;
 403       case OUTPUT_TYPE_NONE:
 404         NOTREACHED();
 405         break;
 406     }
 407   }
 408
 409   // Don't reveal protections requested by other clients.
 410   ProtectionRequests::iterator it = client_protection_requests_.find(client_id);
 411   if (it != client_protection_requests_.end()) {
 412     uint32_t requested_mask = 0;
 413     if (it->second.find(display_id) != it->second.end())
 414       requested_mask = it->second[display_id];
 415     *protection_mask = enabled & ~unfulfilled & requested_mask;
 416   } else {
 417     *protection_mask = 0;
 418   }
 419   return true;
 420 }
 421
 422 bool OutputConfigurator::EnableOutputProtection(
 423     OutputProtectionClientId client_id,
 424     int64 display_id,
 425     uint32_t desired_method_mask) {
 426   if (!configure_display_)
 427     return false;
 428
 429   DisplayProtections protections;
 430   for (ProtectionRequests::const_iterator it =
 431            client_protection_requests_.begin();
 432        it != client_protection_requests_.end();
 433        ++it) {
 434     for (DisplayProtections::const_iterator it2 = it->second.begin();
 435        it2 != it->second.end(); ++it2) {
 436       if (it->first == client_id && it2->first == display_id)
 437         continue;
 438       protections[it2->first] |= it2->second;
 439     }
 440   }
 441   protections[display_id] |= desired_method_mask;
 442
 443   if (!ApplyProtections(protections))
 444     return false;
 445
 446   if (desired_method_mask == OUTPUT_PROTECTION_METHOD_NONE) {
 447     if (client_protection_requests_.find(client_id) !=
 448         client_protection_requests_.end()) {
 449       client_protection_requests_[client_id].erase(display_id);
 450       if (client_protection_requests_[client_id].size() == 0)
 451         client_protection_requests_.erase(client_id);
 452     }
 453   } else {
 454     client_protection_requests_[client_id][display_id] = desired_method_mask;
 455   }
 456
 457   return true;
 458 }
 459
 460 void OutputConfigurator::Stop() {
 461   configure_display_ = false;
 462 }
 463
 464 bool OutputConfigurator::SetDisplayPower(DisplayPowerState power_state,
 465                                          int flags) {
 466   if (!configure_display_)
 467     return false;
 468
 469   VLOG(1) << "SetDisplayPower: power_state="
 470           << DisplayPowerStateToString(power_state) << " flags=" << flags
 471           << ", configure timer="
 472           << ((configure_timer_.get() && configure_timer_->IsRunning()) ?
 473               "Running" : "Stopped");
 474   if (power_state == power_state_ && !(flags & kSetDisplayPowerForceProbe))
 475     return true;
 476
 477   delegate_->GrabServer();
 478   UpdateCachedOutputs();
 479
 480   const OutputState new_state = ChooseOutputState(power_state);
 481   bool attempted_change = false;
 482   bool success = false;
 483
 484   bool only_if_single_internal_display =
 485       flags & kSetDisplayPowerOnlyIfSingleInternalDisplay;
 486   bool single_internal_display =
 487       cached_outputs_.size() == 1 && cached_outputs_[0].is_internal;
 488   if (single_internal_display || !only_if_single_internal_display) {
 489     success = EnterStateOrFallBackToSoftwareMirroring(new_state, power_state);
 490     attempted_change = true;
 491
 492     // Force the DPMS on since the driver doesn't always detect that it
 493     // should turn on. This is needed when coming back from idle suspend.
 494     if (success && power_state != DISPLAY_POWER_ALL_OFF)
 495       delegate_->ForceDPMSOn();
 496   }
 497
 498   delegate_->UngrabServer();
 499   if (attempted_change)
 500     NotifyObservers(success, new_state);
 501   return true;
 502 }
 503
 504 bool OutputConfigurator::SetDisplayMode(OutputState new_state) {
 505   if (!configure_display_)
 506     return false;
 507
 508   VLOG(1) << "SetDisplayMode: state=" << OutputStateToString(new_state);
 509   if (output_state_ == new_state) {
 510     // Cancel software mirroring if the state is moving from
 511     // STATE_DUAL_EXTENDED to STATE_DUAL_EXTENDED.
 512     if (mirroring_controller_ && new_state == STATE_DUAL_EXTENDED)
 513       mirroring_controller_->SetSoftwareMirroring(false);
 514     NotifyObservers(true, new_state);
 515     return true;
 516   }
 517
 518   delegate_->GrabServer();
 519   UpdateCachedOutputs();
 520   const bool success = EnterStateOrFallBackToSoftwareMirroring(
 521       new_state, power_state_);
 522   delegate_->UngrabServer();
 523
 524   NotifyObservers(success, new_state);
 525   return success;
 526 }
 527
 528 bool OutputConfigurator::Dispatch(const base::NativeEvent& event) {
 529   if (!configure_display_)
 530     return true;
 531
 532   if (event->type - xrandr_event_base_ == RRScreenChangeNotify) {
 533     VLOG(1) << "Received RRScreenChangeNotify event";
 534     delegate_->UpdateXRandRConfiguration(event);
 535     return true;
 536   }
 537
 538   // Bail out early for everything except RRNotify_OutputChange events
 539   // about an output getting connected or disconnected.
 540   if (event->type - xrandr_event_base_ != RRNotify)
 541     return true;
 542   const XRRNotifyEvent* notify_event = reinterpret_cast<XRRNotifyEvent*>(event);
 543   if (notify_event->subtype != RRNotify_OutputChange)
 544     return true;
 545   const XRROutputChangeNotifyEvent* output_change_event =
 546       reinterpret_cast<XRROutputChangeNotifyEvent*>(event);
 547   const int action = output_change_event->connection;
 548   if (action != RR_Connected && action != RR_Disconnected)
 549     return true;
 550
 551   const bool connected = (action == RR_Connected);
 552   VLOG(1) << "Received RRNotify_OutputChange event:"
 553           << " output=" << output_change_event->output
 554           << " crtc=" << output_change_event->crtc
 555           << " mode=" << output_change_event->mode
 556           << " action=" << (connected ? "connected" : "disconnected");
 557
 558   bool found_changed_output = false;
 559   for (std::vector<OutputSnapshot>::const_iterator it = cached_outputs_.begin();
 560        it != cached_outputs_.end(); ++it) {
 561     if (it->output == output_change_event->output) {
 562       if (connected && it->crtc == output_change_event->crtc &&
 563           it->current_mode == output_change_event->mode) {
 564         VLOG(1) << "Ignoring event describing already-cached state";
 565         return true;
 566       }
 567       found_changed_output = true;
 568       break;
 569     }
 570   }
 571
 572   if (!connected && !found_changed_output) {
 573     VLOG(1) << "Ignoring event describing already-disconnected output";
 574     return true;
 575   }
 576
 577   // Connecting/disconnecting a display may generate multiple events. Defer
 578   // configuring outputs to avoid grabbing X and configuring displays
 579   // multiple times.
 580   ScheduleConfigureOutputs();
 581   return true;
 582 }
 583
 584 base::EventStatus OutputConfigurator::WillProcessEvent(
 585     const base::NativeEvent& event) {
 586   // XI_HierarchyChanged events are special. There is no window associated with
 587   // these events. So process them directly from here.
 588   if (configure_display_ && event->type == GenericEvent &&
 589       event->xgeneric.evtype == XI_HierarchyChanged) {
 590     VLOG(1) << "Received XI_HierarchyChanged event";
 591     // Defer configuring outputs to not stall event processing.
 592     // This also takes care of same event being received twice.
 593     ScheduleConfigureOutputs();
 594   }
 595
 596   return base::EVENT_CONTINUE;
 597 }
 598
 599 void OutputConfigurator::DidProcessEvent(const base::NativeEvent& event) {
 600 }
 601
 602 void OutputConfigurator::AddObserver(Observer* observer) {
 603   observers_.AddObserver(observer);
 604 }
 605
 606 void OutputConfigurator::RemoveObserver(Observer* observer) {
 607   observers_.RemoveObserver(observer);
 608 }
 609
 610 void OutputConfigurator::SuspendDisplays() {
 611   // If the display is off due to user inactivity and there's only a single
 612   // internal display connected, switch to the all-on state before
 613   // suspending.  This shouldn't be very noticeable to the user since the
 614   // backlight is off at this point, and doing this lets us resume directly
 615   // into the "on" state, which greatly reduces resume times.
 616   if (power_state_ == DISPLAY_POWER_ALL_OFF) {
 617     SetDisplayPower(DISPLAY_POWER_ALL_ON,
 618                     kSetDisplayPowerOnlyIfSingleInternalDisplay);
 619
 620     // We need to make sure that the monitor configuration we just did actually
 621     // completes before we return, because otherwise the X message could be
 622     // racing with the HandleSuspendReadiness message.
 623     delegate_->SyncWithServer();
 624   }
 625 }
 626
 627 void OutputConfigurator::ResumeDisplays() {
 628   // Force probing to ensure that we pick up any changes that were made
 629   // while the system was suspended.
 630   SetDisplayPower(power_state_, kSetDisplayPowerForceProbe);
 631 }
 632
 633 void OutputConfigurator::ScheduleConfigureOutputs() {
 634   if (configure_timer_.get()) {
 635     configure_timer_->Reset();
 636   } else {
 637     configure_timer_.reset(new base::OneShotTimer<OutputConfigurator>());
 638     configure_timer_->Start(
 639         FROM_HERE,
 640         base::TimeDelta::FromMilliseconds(kConfigureDelayMs),
 641         this,
 642         &OutputConfigurator::ConfigureOutputs);
 643   }
 644 }
 645
 646 void OutputConfigurator::UpdateCachedOutputs() {
 647   cached_outputs_ = delegate_->GetOutputs();
 648
 649   // Set |selected_mode| fields.
 650   for (size_t i = 0; i < cached_outputs_.size(); ++i) {
 651     OutputSnapshot* output = &cached_outputs_[i];
 652     if (output->has_display_id) {
 653       int width = 0, height = 0;
 654       if (state_controller_ &&
 655           state_controller_->GetResolutionForDisplayId(
 656               output->display_id, &width, &height)) {
 657         output->selected_mode =
 658             FindOutputModeMatchingSize(*output, width, height);
 659       }
 660     }
 661     // Fall back to native mode.
 662     if (output->selected_mode == None)
 663       output->selected_mode = output->native_mode;
 664   }
 665
 666   // Set |mirror_mode| fields.
 667   if (cached_outputs_.size() == 2) {
 668     bool one_is_internal = cached_outputs_[0].is_internal;
 669     bool two_is_internal = cached_outputs_[1].is_internal;
 670     int internal_outputs = (one_is_internal ? 1 : 0) +
 671         (two_is_internal ? 1 : 0);
 672     DCHECK_LT(internal_outputs, 2);
 673     LOG_IF(WARNING, internal_outputs == 2)
 674         << "Two internal outputs detected.";
 675
 676     bool can_mirror = false;
 677     for (int attempt = 0; !can_mirror && attempt < 2; ++attempt) {
 678       // Try preserving external output's aspect ratio on the first attempt.
 679       // If that fails, fall back to the highest matching resolution.
 680       bool preserve_aspect = attempt == 0;
 681
 682       if (internal_outputs == 1) {
 683         if (one_is_internal) {
 684           can_mirror = FindMirrorMode(&cached_outputs_[0], &cached_outputs_[1],
 685               is_panel_fitting_enabled_, preserve_aspect);
 686         } else {
 687           DCHECK(two_is_internal);
 688           can_mirror = FindMirrorMode(&cached_outputs_[1], &cached_outputs_[0],
 689               is_panel_fitting_enabled_, preserve_aspect);
 690         }
 691       } else {  // if (internal_outputs == 0)
 692         // No panel fitting for external outputs, so fall back to exact match.
 693         can_mirror = FindMirrorMode(&cached_outputs_[0], &cached_outputs_[1],
 694                                     false, preserve_aspect);
 695         if (!can_mirror && preserve_aspect) {
 696           // FindMirrorMode() will try to preserve aspect ratio of what it
 697           // thinks is external display, so if it didn't succeed with one, maybe
 698           // it will succeed with the other.  This way we will have the correct
 699           // aspect ratio on at least one of them.
 700           can_mirror = FindMirrorMode(&cached_outputs_[1], &cached_outputs_[0],
 701                                       false, preserve_aspect);
 702         }
 703       }
 704     }
 705   }
 706 }
 707
 708 bool OutputConfigurator::FindMirrorMode(OutputSnapshot* internal_output,
 709                                         OutputSnapshot* external_output,
 710                                         bool try_panel_fitting,
 711                                         bool preserve_aspect) {
 712   const ModeInfo* internal_native_info =
 713       GetModeInfo(*internal_output, internal_output->native_mode);
 714   const ModeInfo* external_native_info =
 715       GetModeInfo(*external_output, external_output->native_mode);
 716   if (!internal_native_info || !external_native_info)
 717     return false;
 718
 719   // Check if some external output resolution can be mirrored on internal.
 720   // Prefer the modes in the order that X sorts them, assuming this is the order
 721   // in which they look better on the monitor.
 722   for (ModeInfoMap::const_iterator external_it =
 723        external_output->mode_infos.begin();
 724        external_it != external_output->mode_infos.end(); ++external_it) {
 725     const ModeInfo& external_info = external_it->second;
 726     bool is_native_aspect_ratio =
 727         external_native_info->width * external_info.height ==
 728         external_native_info->height * external_info.width;
 729     if (preserve_aspect && !is_native_aspect_ratio)
 730       continue;  // Allow only aspect ratio preserving modes for mirroring.
 731
 732     // Try finding an exact match.
 733     for (ModeInfoMap::const_iterator internal_it =
 734          internal_output->mode_infos.begin();
 735          internal_it != internal_output->mode_infos.end(); ++internal_it) {
 736       const ModeInfo& internal_info = internal_it->second;
 737       if (internal_info.width == external_info.width &&
 738           internal_info.height == external_info.height &&
 739           internal_info.interlaced == external_info.interlaced) {
 740         internal_output->mirror_mode = internal_it->first;
 741         external_output->mirror_mode = external_it->first;
 742         return true;  // Mirror mode found.
 743       }
 744     }
 745
 746     // Try to create a matching internal output mode by panel fitting.
 747     if (try_panel_fitting) {
 748       // We can downscale by 1.125, and upscale indefinitely. Downscaling looks
 749       // ugly, so, can fit == can upscale. Also, internal panels don't support
 750       // fitting interlaced modes.
 751       bool can_fit =
 752           internal_native_info->width >= external_info.width &&
 753           internal_native_info->height >= external_info.height &&
 754           !external_info.interlaced;
 755       if (can_fit) {
 756         RRMode mode = external_it->first;
 757         delegate_->AddOutputMode(internal_output->output, mode);
 758         internal_output->mode_infos.insert(std::make_pair(mode, external_info));
 759         internal_output->mirror_mode = mode;
 760         external_output->mirror_mode = mode;
 761         return true;  // Mirror mode created.
 762       }
 763     }
 764   }
 765
 766   return false;
 767 }
 768
 769 void OutputConfigurator::ConfigureOutputs() {
 770   configure_timer_.reset();
 771
 772   delegate_->GrabServer();
 773   UpdateCachedOutputs();
 774   const OutputState new_state = ChooseOutputState(power_state_);
 775   const bool success = EnterStateOrFallBackToSoftwareMirroring(
 776       new_state, power_state_);
 777   delegate_->UngrabServer();
 778
 779   NotifyObservers(success, new_state);
 780   delegate_->SendProjectingStateToPowerManager(IsProjecting(cached_outputs_));
 781 }
 782
 783 void OutputConfigurator::NotifyObservers(bool success,
 784                                          OutputState attempted_state) {
 785   if (success) {
 786     FOR_EACH_OBSERVER(Observer, observers_,
 787                       OnDisplayModeChanged(cached_outputs_));
 788   } else {
 789     FOR_EACH_OBSERVER(Observer, observers_,
 790                       OnDisplayModeChangeFailed(attempted_state));
 791   }
 792 }
 793
 794 bool OutputConfigurator::EnterStateOrFallBackToSoftwareMirroring(
 795     OutputState output_state,
 796     DisplayPowerState power_state) {
 797   bool success = EnterState(output_state, power_state);
 798   if (mirroring_controller_) {
 799     bool enable_software_mirroring = false;
 800     if (!success && output_state == STATE_DUAL_MIRROR) {
 801       if (output_state_ != STATE_DUAL_EXTENDED || power_state_ != power_state)
 802         EnterState(STATE_DUAL_EXTENDED, power_state);
 803       enable_software_mirroring = success =
 804           output_state_ == STATE_DUAL_EXTENDED;
 805     }
 806     mirroring_controller_->SetSoftwareMirroring(enable_software_mirroring);
 807   }
 808   return success;
 809 }
 810
 811 bool OutputConfigurator::EnterState(
 812     OutputState output_state,
 813     DisplayPowerState power_state) {
 814   std::vector<bool> output_power;
 815   int num_on_outputs = GetOutputPower(
 816       cached_outputs_, power_state, &output_power);
 817   VLOG(1) << "EnterState: output=" << OutputStateToString(output_state)
 818           << " power=" << DisplayPowerStateToString(power_state);
 819
 820   // Framebuffer dimensions.
 821   int width = 0, height = 0;
 822   std::vector<OutputSnapshot> updated_outputs = cached_outputs_;
 823
 824   switch (output_state) {
 825     case STATE_INVALID:
 826       NOTREACHED() << "Ignoring request to enter invalid state with "
 827                    << updated_outputs.size() << " connected output(s)";
 828       return false;
 829     case STATE_HEADLESS:
 830       if (updated_outputs.size() != 0) {
 831         LOG(WARNING) << "Ignoring request to enter headless mode with "
 832                      << updated_outputs.size() << " connected output(s)";
 833         return false;
 834       }
 835       break;
 836     case STATE_SINGLE: {
 837       // If there are multiple outputs connected, only one should be turned on.
 838       if (updated_outputs.size() != 1 && num_on_outputs != 1) {
 839         LOG(WARNING) << "Ignoring request to enter single mode with "
 840                      << updated_outputs.size() << " connected outputs and "
 841                      << num_on_outputs << " turned on";
 842         return false;
 843       }
 844
 845       for (size_t i = 0; i < updated_outputs.size(); ++i) {
 846         OutputSnapshot* output = &updated_outputs[i];
 847         output->x = 0;
 848         output->y = 0;
 849         output->current_mode = output_power[i] ? output->selected_mode : None;
 850
 851         if (output_power[i] || updated_outputs.size() == 1) {
 852           const ModeInfo* mode_info =
 853               GetModeInfo(*output, output->selected_mode);
 854           if (!mode_info)
 855             return false;
 856           if (mode_info->width == 1024 && mode_info->height == 768) {
 857             VLOG(1) << "Potentially misdetecting display(1024x768):"
 858                     << " outputs size=" << updated_outputs.size()
 859                     << ", num_on_outputs=" << num_on_outputs
 860                     << ", current size:" << width << "x" << height
 861                     << ", i=" << i
 862                     << ", output=" << OutputSnapshotToString(output)
 863                     << ", mode_info=" << ModeInfoToString(mode_info);
 864           }
 865           width = mode_info->width;
 866           height = mode_info->height;
 867         }
 868       }
 869       break;
 870     }
 871     case STATE_DUAL_MIRROR: {
 872       if (updated_outputs.size() != 2 ||
 873           (num_on_outputs != 0 && num_on_outputs != 2)) {
 874         LOG(WARNING) << "Ignoring request to enter mirrored mode with "
 875                      << updated_outputs.size() << " connected output(s) and "
 876                      << num_on_outputs << " turned on";
 877         return false;
 878       }
 879
 880       if (!updated_outputs[0].mirror_mode)
 881         return false;
 882       const ModeInfo* mode_info =
 883           GetModeInfo(updated_outputs[0], updated_outputs[0].mirror_mode);
 884       if (!mode_info)
 885         return false;
 886       width = mode_info->width;
 887       height = mode_info->height;
 888
 889       for (size_t i = 0; i < updated_outputs.size(); ++i) {
 890         OutputSnapshot* output = &updated_outputs[i];
 891         output->x = 0;
 892         output->y = 0;
 893         output->current_mode = output_power[i] ? output->mirror_mode : None;
 894         if (output->touch_device_id) {
 895           // CTM needs to be calculated if aspect preserving scaling is used.
 896           // Otherwise, assume it is full screen, and use identity CTM.
 897           if (output->mirror_mode != output->native_mode &&
 898               output->is_aspect_preserving_scaling) {
 899             output->transform = GetMirrorModeCTM(*output);
 900             mirrored_display_area_ratio_map_[output->touch_device_id] =
 901                 GetMirroredDisplayAreaRatio(*output);
 902           }
 903         }
 904       }
 905       break;
 906     }
 907     case STATE_DUAL_EXTENDED: {
 908       if (updated_outputs.size() != 2 ||
 909           (num_on_outputs != 0 && num_on_outputs != 2)) {
 910         LOG(WARNING) << "Ignoring request to enter extended mode with "
 911                      << updated_outputs.size() << " connected output(s) and "
 912                      << num_on_outputs << " turned on";
 913         return false;
 914       }
 915
 916       for (size_t i = 0; i < updated_outputs.size(); ++i) {
 917         OutputSnapshot* output = &updated_outputs[i];
 918         output->x = 0;
 919         output->y = height ? height + kVerticalGap : 0;
 920         output->current_mode = output_power[i] ? output->selected_mode : None;
 921
 922         // Retain the full screen size even if all outputs are off so the
 923         // same desktop configuration can be restored when the outputs are
 924         // turned back on.
 925         const ModeInfo* mode_info =
 926             GetModeInfo(updated_outputs[i], updated_outputs[i].selected_mode);
 927         if (!mode_info)
 928           return false;
 929         width = std::max<int>(width, mode_info->width);
 930         height += (height ? kVerticalGap : 0) + mode_info->height;
 931       }
 932
 933       for (size_t i = 0; i < updated_outputs.size(); ++i) {
 934         OutputSnapshot* output = &updated_outputs[i];
 935         if (output->touch_device_id)
 936           output->transform = GetExtendedModeCTM(*output, width, height);
 937       }
 938       break;
 939     }
 940   }
 941
 942   // Finally, apply the desired changes.
 943   DCHECK_EQ(cached_outputs_.size(), updated_outputs.size());
 944   bool all_succeeded = true;
 945   if (!updated_outputs.empty()) {
 946     delegate_->CreateFrameBuffer(width, height, updated_outputs);
 947     for (size_t i = 0; i < updated_outputs.size(); ++i) {
 948       const OutputSnapshot& output = updated_outputs[i];
 949       bool configure_succeeded =false;
 950
 951       while (true) {
 952         if (delegate_->ConfigureCrtc(output.crtc, output.current_mode,
 953                                        output.output, output.x, output.y)) {
 954           configure_succeeded = true;
 955           break;
 956         }
 957
 958         LOG(WARNING) << "Unable to configure CRTC " << output.crtc << ":"
 959                      << " mode=" << output.current_mode
 960                      << " output=" << output.output
 961                      << " x=" << output.x
 962                      << " y=" << output.y;
 963
 964         const ModeInfo* mode_info = GetModeInfo(output, output.current_mode);
 965         if (!mode_info)
 966           break;
 967
 968         // Find the mode with the next-best resolution and see if that can
 969         // be set.
 970         int best_mode_pixels = 0;
 971
 972         int current_mode_pixels = mode_info->width * mode_info->height;
 973         for (ModeInfoMap::const_iterator it = output.mode_infos.begin();
 974              it != output.mode_infos.end(); it++) {
 975           int pixel_count = it->second.width * it->second.height;
 976           if ((pixel_count < current_mode_pixels) &&
 977               (pixel_count > best_mode_pixels)) {
 978             updated_outputs[i].current_mode = it->first;
 979             best_mode_pixels = pixel_count;
 980           }
 981         }
 982
 983         if (best_mode_pixels == 0)
 984           break;
 985       }
 986
 987       if (configure_succeeded) {
 988         if (output.touch_device_id)
 989           delegate_->ConfigureCTM(output.touch_device_id, output.transform);
 990         cached_outputs_[i] = updated_outputs[i];
 991       } else {
 992         all_succeeded = false;
 993       }
 994
 995       // If we are trying to set mirror mode and one of the modesets fails,
 996       // then the two monitors will be mis-matched.  In this case, return
 997       // false to let the observers be aware.
 998       if (output_state == STATE_DUAL_MIRROR &&
 999           output_power[i] &&
1000           output.current_mode != output.mirror_mode)
1001         all_succeeded = false;
1002
1003     }
1004   }
1005
1006   if (all_succeeded)  {
1007     output_state_ = output_state;
1008     power_state_ = power_state;
1009   }
1010   return all_succeeded;
1011 }
1012
1013 OutputState OutputConfigurator::ChooseOutputState(
1014     DisplayPowerState power_state) const {
1015   int num_on_outputs = GetOutputPower(cached_outputs_, power_state, NULL);
1016   switch (cached_outputs_.size()) {
1017     case 0:
1018       return STATE_HEADLESS;
1019     case 1:
1020       return STATE_SINGLE;
1021     case 2: {
1022       if (num_on_outputs == 1) {
1023         // If only one output is currently turned on, return the "single"
1024         // state so that its native mode will be used.
1025         return STATE_SINGLE;
1026       } else {
1027         // With either both outputs on or both outputs off, use one of the
1028         // dual modes.
1029         std::vector<int64> display_ids;
1030         for (size_t i = 0; i < cached_outputs_.size(); ++i) {
1031           // If display id isn't available, switch to extended mode.
1032           if (!cached_outputs_[i].has_display_id)
1033             return STATE_DUAL_EXTENDED;
1034           display_ids.push_back(cached_outputs_[i].display_id);
1035         }
1036         return state_controller_->GetStateForDisplayIds(display_ids);
1037       }
1038     }
1039     default:
1040       NOTREACHED();
1041   }
1042   return STATE_INVALID;
1043 }
1044
1045 OutputConfigurator::CoordinateTransformation
1046 OutputConfigurator::GetMirrorModeCTM(
1047     const OutputConfigurator::OutputSnapshot& output) {
1048   CoordinateTransformation ctm;  // Default to identity
1049   const ModeInfo* native_mode_info = GetModeInfo(output, output.native_mode);
1050   const ModeInfo* mirror_mode_info = GetModeInfo(output, output.mirror_mode);
1051
1052   if (!native_mode_info || !mirror_mode_info ||
1053       native_mode_info->height == 0 || mirror_mode_info->height == 0 ||
1054       native_mode_info->width == 0 || mirror_mode_info->width == 0)
1055     return ctm;
1056
1057   float native_mode_ar = static_cast<float>(native_mode_info->width) /
1058       static_cast<float>(native_mode_info->height);
1059   float mirror_mode_ar = static_cast<float>(mirror_mode_info->width) /
1060       static_cast<float>(mirror_mode_info->height);
1061
1062   if (mirror_mode_ar > native_mode_ar) {  // Letterboxing
1063     ctm.x_scale = 1.0;
1064     ctm.x_offset = 0.0;
1065     ctm.y_scale = mirror_mode_ar / native_mode_ar;
1066     ctm.y_offset = (native_mode_ar / mirror_mode_ar - 1.0) * 0.5;
1067     return ctm;
1068   }
1069   if (native_mode_ar > mirror_mode_ar) {  // Pillarboxing
1070     ctm.y_scale = 1.0;
1071     ctm.y_offset = 0.0;
1072     ctm.x_scale = native_mode_ar / mirror_mode_ar;
1073     ctm.x_offset = (mirror_mode_ar / native_mode_ar - 1.0) * 0.5;
1074     return ctm;
1075   }
1076
1077   return ctm;  // Same aspect ratio - return identity
1078 }
1079
1080 OutputConfigurator::CoordinateTransformation
1081 OutputConfigurator::GetExtendedModeCTM(
1082     const OutputConfigurator::OutputSnapshot& output,
1083     int framebuffer_width,
1084     int framebuffer_height) {
1085   CoordinateTransformation ctm;  // Default to identity
1086   const ModeInfo* mode_info = GetModeInfo(output, output.selected_mode);
1087   DCHECK(mode_info);
1088   if (!mode_info)
1089     return ctm;
1090   // An example of how to calculate the CTM.
1091   // Suppose we have 2 monitors, the first one has size 1366 x 768.
1092   // The second one has size 2560 x 1600
1093   // The total size of framebuffer is 2560 x 2428
1094   // where 2428 = 768 + 60 (hidden gap) + 1600
1095   // and the sceond monitor is translated to Point (0, 828) in the
1096   // framebuffer.
1097   // X will first map input event location to [0, 2560) x [0, 2428),
1098   // then apply CTM on it.
1099   // So to compute CTM, for monitor1, we have
1100   // x_scale = (1366 - 1) / (2560 - 1)
1101   // x_offset = 0 / (2560 - 1)
1102   // y_scale = (768 - 1) / (2428 - 1)
1103   // y_offset = 0 / (2428 -1)
1104   // For Monitor 2, we have
1105   // x_scale = (2560 - 1) / (2560 - 1)
1106   // x_offset = 0 / (2560 - 1)
1107   // y_scale = (1600 - 1) / (2428 - 1)
1108   // y_offset = 828 / (2428 -1)
1109   // See the unittest OutputConfiguratorTest.CTMForMultiScreens.
1110   ctm.x_scale =
1111       static_cast<float>(mode_info->width - 1) / (framebuffer_width - 1);
1112   ctm.x_offset = static_cast<float>(output.x) / (framebuffer_width - 1);
1113   ctm.y_scale =
1114       static_cast<float>(mode_info->height - 1) / (framebuffer_height - 1);
1115   ctm.y_offset = static_cast<float>(output.y) / (framebuffer_height - 1);
1116   return ctm;
1117 }
1118
1119 float OutputConfigurator::GetMirroredDisplayAreaRatio(
1120     const OutputConfigurator::OutputSnapshot& output) {
1121   float area_ratio = 1.0f;
1122   const ModeInfo* native_mode_info = GetModeInfo(output, output.native_mode);
1123   const ModeInfo* mirror_mode_info = GetModeInfo(output, output.mirror_mode);
1124
1125   if (!native_mode_info || !mirror_mode_info ||
1126       native_mode_info->height == 0 || mirror_mode_info->height == 0 ||
1127       native_mode_info->width == 0 || mirror_mode_info->width == 0)
1128     return area_ratio;
1129
1130   float width_ratio = static_cast<float>(mirror_mode_info->width) /
1131       static_cast<float>(native_mode_info->width);
1132   float height_ratio = static_cast<float>(mirror_mode_info->height) /
1133       static_cast<float>(native_mode_info->height);
1134
1135   area_ratio = width_ratio * height_ratio;
1136   return area_ratio;
1137 }
1138
1139 }  // namespace chromeos