Add FakeDisplayDelegate for off device usage.

ui/display/fake_display_delegate.cc

Index: ui/display/fake_display_delegate.cc
diff --git a/ui/display/fake_display_delegate.cc b/ui/display/fake_display_delegate.cc
new file mode 100644
index 0000000000000000000000000000000000000000..09c0bbb7b56052c7b92eea1772c0d290899e145b
--- /dev/null
+++ b/ui/display/fake_display_delegate.cc
@@ -0,0 +1,192 @@
+// Copyright 2016 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/fake_display_delegate.h"
+
+#include <string>
+
+#include "base/command_line.h"
+#include "base/logging.h"
+#include "base/memory/ptr_util.h"
+#include "base/strings/string_split.h"
+#include "ui/display/display.h"
+#include "ui/display/display_switches.h"
+#include "ui/display/types/native_display_observer.h"
+#include "ui/display/util/display_util.h"
+
+namespace display {
+
+namespace {
+
+// The EDID specification marks the top bit of the manufacturer id as reserved.
+const int16_t kReservedManufacturerID = static_cast<int16_t>(1 << 15);
+
+// A random product number we'll use.
+const int32_t kProductId = 1000;
+
+}  // namespace
+
+FakeDisplayDelegate::FakeDisplayDelegate() {}
+
+FakeDisplayDelegate::~FakeDisplayDelegate() {}
+
+int64_t FakeDisplayDelegate::AddDisplay(const gfx::Size& display_size) {
+  if (next_display_id_ == 0xFF) {
+    LOG(ERROR) << "Exceeded display id limit";
+    return display::Display::kInvalidDisplayID;
+  }
+
+  // Add the first display as internal.

[rjkroege, 2016/09/15 00:52:46]

I could see it desirable to see what happens to upstream code when the first
display is not the internal. Should a future extension of this code permit the
command line flag to specify which display is internal?

[kylechar, 2016/09/15 17:31:55]

Yes definitely.

+  ui::DisplayConnectionType type = displays_.empty()
+                                       ? ui::DISPLAY_CONNECTION_TYPE_INTERNAL
+                                       : ui::DISPLAY_CONNECTION_TYPE_UNKNOWN;
+
+  int64_t display_id = GenerateDisplayID(kReservedManufacturerID, kProductId,
+                                         ++next_display_id_);
+  displays_.push_back(
+      base::MakeUnique<FakeDisplaySnapshot>(display_id, display_size, type));
+  OnConfigurationChanged();
+
+  return display_id;
+}
+
+bool FakeDisplayDelegate::RemoveDisplay(int64_t display_id) {
+  // Find display snapshot with matching id and remove it.
+  for (auto iter = displays_.begin(); iter != displays_.end(); ++iter) {
+    if ((*iter)->display_id() == display_id) {
+      displays_.erase(iter);
+      OnConfigurationChanged();
+      return true;
+    }
+  }
+
+  return false;
+}
+
+void FakeDisplayDelegate::Initialize() {
+  DCHECK(!initialized_);
+  InitFromCommandLine();
+
+  // If no command line flags are provided then initialize a default display.
+  if (displays_.empty())
+    AddDisplay(gfx::Size(1024, 768));
+
+  initialized_ = true;
+}
+
+void FakeDisplayDelegate::GrabServer() {}
+
+void FakeDisplayDelegate::UngrabServer() {}
+
+void FakeDisplayDelegate::TakeDisplayControl(
+    const ui::DisplayControlCallback& callback) {
+  callback.Run(false);
+}
+
+void FakeDisplayDelegate::RelinquishDisplayControl(
+    const ui::DisplayControlCallback& callback) {
+  callback.Run(false);
+}
+
+void FakeDisplayDelegate::SyncWithServer() {}
+
+void FakeDisplayDelegate::SetBackgroundColor(uint32_t color_argb) {}
+
+void FakeDisplayDelegate::ForceDPMSOn() {}
+
+void FakeDisplayDelegate::GetDisplays(const ui::GetDisplaysCallback& callback) {
+  std::vector<ui::DisplaySnapshot*> displays;
+  for (auto& display : displays_)
+    displays.push_back(display.get());
+  callback.Run(displays);
+}
+
+void FakeDisplayDelegate::AddMode(const ui::DisplaySnapshot& output,
+                                  const ui::DisplayMode* mode) {}
+
+void FakeDisplayDelegate::Configure(const ui::DisplaySnapshot& output,
+                                    const ui::DisplayMode* mode,
+                                    const gfx::Point& origin,
+                                    const ui::ConfigureCallback& callback) {
+  callback.Run(true);
+}
+
+void FakeDisplayDelegate::CreateFrameBuffer(const gfx::Size& size) {}
+
+void FakeDisplayDelegate::GetHDCPState(
+    const ui::DisplaySnapshot& output,
+    const ui::GetHDCPStateCallback& callback) {
+  callback.Run(false, ui::HDCP_STATE_UNDESIRED);
+}
+
+void FakeDisplayDelegate::SetHDCPState(
+    const ui::DisplaySnapshot& output,
+    ui::HDCPState state,
+    const ui::SetHDCPStateCallback& callback) {
+  callback.Run(false);
+}
+
+std::vector<ui::ColorCalibrationProfile>
+FakeDisplayDelegate::GetAvailableColorCalibrationProfiles(
+    const ui::DisplaySnapshot& output) {
+  return std::vector<ui::ColorCalibrationProfile>();
+}
+
+bool FakeDisplayDelegate::SetColorCalibrationProfile(
+    const ui::DisplaySnapshot& output,
+    ui::ColorCalibrationProfile new_profile) {
+  return false;
+}
+
+bool FakeDisplayDelegate::SetColorCorrection(
+    const ui::DisplaySnapshot& output,
+    const std::vector<ui::GammaRampRGBEntry>& degamma_lut,
+    const std::vector<ui::GammaRampRGBEntry>& gamma_lut,
+    const std::vector<float>& correction_matrix) {
+  return false;
+}
+
+void FakeDisplayDelegate::AddObserver(ui::NativeDisplayObserver* observer) {
+  observers_.AddObserver(observer);
+}
+
+void FakeDisplayDelegate::RemoveObserver(ui::NativeDisplayObserver* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+FakeDisplayController* FakeDisplayDelegate::GetFakeDisplayController() {
+  return static_cast<FakeDisplayController*>(this);
+}
+
+void FakeDisplayDelegate::InitFromCommandLine() {
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+  if (!command_line->HasSwitch(switches::kDisplayConfig))
+    return;
+
+  const std::string command_string =
+      command_line->GetSwitchValueASCII(switches::kDisplayConfig);
+
+  // Split on commas and parse each display string.
+  for (std::string part : base::SplitString(
+           command_string, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL)) {
+    int width = 0;
+    int height = 0;
+    if (sscanf(part.c_str(), "%dx%d", &width, &height) >= 2) {
+      gfx::Size display_size(width, height);
+      AddDisplay(display_size);
+    } else {
+      LOG(ERROR) << "Failed to parse display \"" << part << "\"";
+    }
+  }
+}
+
+void FakeDisplayDelegate::OnConfigurationChanged() {
+  if (!initialized_)
+    return;
+
+  FOR_EACH_OBSERVER(ui::NativeDisplayObserver, observers_,
+                    OnConfigurationChanged());
+}
+
+}  // namespace display