Add display task to trigger display configuration

ui/display/chromeos/update_display_configuration_task.cc

Index: ui/display/chromeos/update_display_configuration_task.cc
diff --git a/ui/display/chromeos/update_display_configuration_task.cc b/ui/display/chromeos/update_display_configuration_task.cc
new file mode 100644
index 0000000000000000000000000000000000000000..fea9214dc021c899b1aac6c41c4eec548b683a29
--- /dev/null
+++ b/ui/display/chromeos/update_display_configuration_task.cc
@@ -0,0 +1,210 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/display/chromeos/update_display_configuration_task.h"
+
+#include "ui/display/chromeos/configure_displays_task.h"
+#include "ui/display/chromeos/display_util.h"
+#include "ui/display/types/display_snapshot.h"
+#include "ui/display/types/native_display_delegate.h"
+
+namespace ui {
+
+UpdateDisplayConfigurationTask::UpdateDisplayConfigurationTask(
+    NativeDisplayDelegate* delegate,
+    DisplayConfigurator::DisplayLayoutManager* layout_manager,
+    MultipleDisplayState new_display_state,
+    chromeos::DisplayPowerState new_power_state,
+    int power_flags,
+    uint32_t background_color_argb,
+    bool force_configure,
+    const ResponseCallback& callback)
+    : delegate_(delegate),
+      layout_manager_(layout_manager),
+      new_display_state_(new_display_state),
+      new_power_state_(new_power_state),
+      power_flags_(power_flags),
+      background_color_argb_(background_color_argb),
+      force_configure_(force_configure),
+      callback_(callback),
+      force_dpms_(false),
+      weak_ptr_factory_(this) {
+  delegate_->GrabServer();
+}
+
+UpdateDisplayConfigurationTask::~UpdateDisplayConfigurationTask() {
+  delegate_->UngrabServer();
+}
+
+void UpdateDisplayConfigurationTask::Run() {
+  delegate_->GetDisplays(
+      base::Bind(&UpdateDisplayConfigurationTask::OnDisplaysUpdated,
+                 weak_ptr_factory_.GetWeakPtr()));
+}
+
+void UpdateDisplayConfigurationTask::OnDisplaysUpdated(
+    const std::vector<DisplaySnapshot*>& displays) {
+  cached_displays_ = layout_manager_->ParseDisplays(displays);
+
+  if (cached_displays_.size() > 1 && background_color_argb_)
+    delegate_->SetBackgroundColor(background_color_argb_);
+
+  // If the user hasn't requested a display state, update it using the requested
+  // power state.
+  if (new_display_state_ == MULTIPLE_DISPLAY_STATE_INVALID)
+    new_display_state_ = ChooseDisplayState();
+
+  VLOG(1) << "OnDisplaysUpdated: new_display_state="
+          << MultipleDisplayStateToString(new_display_state_)
+          << " new_power_state=" << DisplayPowerStateToString(new_power_state_)
+          << " flags=" << power_flags_
+          << " force_configure=" << force_configure_
+          << " display_count=" << cached_displays_.size();
+  // If there has been any change in the requested power state and the displays
+  // aren't being turned off force a change in DPMS state.
+  force_dpms_ = ShouldForceDpms() && ShouldConfigure();
+
+  if (ShouldConfigure()) {
+    EnterState(base::Bind(&UpdateDisplayConfigurationTask::OnStateEntered,
+                          weak_ptr_factory_.GetWeakPtr()));
+  } else {
+    // If we don't have to configure then we're sticking with the old
+    // configuration. Update it such that it reflects in the reported value.
+    new_power_state_ = layout_manager_->GetPowerState();
+    FinishConfiguration(true);
+  }
+}
+
+void UpdateDisplayConfigurationTask::EnterState(
+    const ConfigureDisplaysTask::ResponseCallback& callback) {
+  VLOG(2) << "EnterState";
+  std::vector<DisplayConfigureRequest> requests;
+  if (!layout_manager_->GetDisplayLayout(cached_displays_, new_display_state_,
+                                         new_power_state_, &requests,
+                                         &framebuffer_size_)) {
+    callback.Run(ConfigureDisplaysTask::ERROR);
+    return;
+  }
+
+  if (!requests.empty()) {
+    delegate_->CreateFrameBuffer(framebuffer_size_);
+    configure_task_.reset(
+        new ConfigureDisplaysTask(delegate_, requests, callback));
+    configure_task_->Run();
+  } else {
+    VLOG(2) << "No displays";
+    callback.Run(ConfigureDisplaysTask::SUCCESS);
+  }
+}
+
+void UpdateDisplayConfigurationTask::OnStateEntered(
+    ConfigureDisplaysTask::Status status) {
+  bool success = status != ConfigureDisplaysTask::ERROR;
+  if (new_display_state_ == MULTIPLE_DISPLAY_STATE_DUAL_MIRROR &&
+      status == ConfigureDisplaysTask::PARTIAL_SUCCESS)
+    success = false;
+
+  if (layout_manager_->GetSoftwareMirroringController()) {
+    bool enable_software_mirroring = false;
+    if (!success && new_display_state_ == MULTIPLE_DISPLAY_STATE_DUAL_MIRROR) {
+      if (layout_manager_->GetDisplayState() !=
+              MULTIPLE_DISPLAY_STATE_DUAL_EXTENDED ||
+          layout_manager_->GetPowerState() != new_power_state_) {
+        new_display_state_ = MULTIPLE_DISPLAY_STATE_DUAL_EXTENDED;
+        EnterState(base::Bind(
+            &UpdateDisplayConfigurationTask::OnEnableSoftwareMirroring,
+            weak_ptr_factory_.GetWeakPtr()));
+        return;
+      }
+
+      success = layout_manager_->GetDisplayState() ==
+                MULTIPLE_DISPLAY_STATE_DUAL_EXTENDED;
+      enable_software_mirroring = success;
+      if (success)
+        new_display_state_ = MULTIPLE_DISPLAY_STATE_DUAL_EXTENDED;
+    }
+
+    layout_manager_->GetSoftwareMirroringController()->SetSoftwareMirroring(
+        enable_software_mirroring);
+  }
+
+  FinishConfiguration(success);
+}
+
+void UpdateDisplayConfigurationTask::OnEnableSoftwareMirroring(
+    ConfigureDisplaysTask::Status status) {
+  bool success = status != ConfigureDisplaysTask::ERROR;
+  layout_manager_->GetSoftwareMirroringController()->SetSoftwareMirroring(
+      success);
+  FinishConfiguration(success);
+}
+
+void UpdateDisplayConfigurationTask::FinishConfiguration(bool success) {
+  if (success && force_dpms_)
+    delegate_->ForceDPMSOn();
+
+  callback_.Run(success, cached_displays_, framebuffer_size_,
+                new_display_state_, new_power_state_);
+}
+
+bool UpdateDisplayConfigurationTask::ShouldForceDpms() const {
+  return new_power_state_ != chromeos::DISPLAY_POWER_ALL_OFF &&
+         (layout_manager_->GetPowerState() != new_power_state_ ||
+          (power_flags_ & DisplayConfigurator::kSetDisplayPowerForceProbe));
+}
+
+bool UpdateDisplayConfigurationTask::ShouldConfigure() const {
+  if (force_configure_)
+    return true;
+
+  if (cached_displays_.size() == 1 &&
+      cached_displays_[0].display->type() == DISPLAY_CONNECTION_TYPE_INTERNAL)
+    return true;
+
+  if (!(power_flags_ &
+        DisplayConfigurator::kSetDisplayPowerOnlyIfSingleInternalDisplay))
+    return true;
+
+  if (new_display_state_ != layout_manager_->GetDisplayState())
+    return true;
+
+  return false;
+}
+
+MultipleDisplayState UpdateDisplayConfigurationTask::ChooseDisplayState()
+    const {
+  int num_on_displays =
+      GetDisplayPower(cached_displays_, new_power_state_, NULL);
+  switch (cached_displays_.size()) {
+    case 0:
+      return MULTIPLE_DISPLAY_STATE_HEADLESS;
+    case 1:
+      return MULTIPLE_DISPLAY_STATE_SINGLE;
+    default: {
+      if (num_on_displays == 1) {
+        // If only one display is currently turned on, return the "single"
+        // state so that its native mode will be used.
+        return MULTIPLE_DISPLAY_STATE_SINGLE;
+      }
+      if (num_on_displays >= 3) {
+        return MULTIPLE_DISPLAY_STATE_MULTI_EXTENDED;
+      } else if (cached_displays_.size() == 2) {
+        if (!layout_manager_->GetStateController())
+          return MULTIPLE_DISPLAY_STATE_DUAL_EXTENDED;
+        // With either both displays on or both displays off, use one of the
+        // dual modes.
+        std::vector<int64_t> display_ids;
+        for (size_t i = 0; i < cached_displays_.size(); ++i)
+          display_ids.push_back(cached_displays_[i].display->display_id());
+
+        return layout_manager_->GetStateController()->GetStateForDisplayIds(
+            display_ids);
+      }
+      NOTREACHED();
+    }
+  }
+  return MULTIPLE_DISPLAY_STATE_INVALID;
+}
+
+}  // namespace ui