Ozone integration.

ui/ozone/public/ozone_platform.cc

+// 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 "base/command_line.h"
+#include "base/logging.h"
+#include "base/trace_event/trace_event.h"
+#include "ui/events/devices/device_data_manager.h"
+#include "ui/ozone/platform_object.h"
+#include "ui/ozone/platform_selection.h"
+#include "ui/ozone/public/ozone_platform.h"
+#include "ui/ozone/public/ozone_switches.h"
+
+namespace ui {
+
+namespace {
+
+bool g_platform_initialized_ui = false;
+bool g_platform_initialized_gpu = false;
+
+}
+
+OzonePlatform::OzonePlatform() {
+  DCHECK(!instance_) << "There should only be a single OzonePlatform.";
+  instance_ = this;
+  g_platform_initialized_ui = false;
+  g_platform_initialized_gpu = false;
+}
+
+OzonePlatform::~OzonePlatform() {
+  DCHECK_EQ(instance_, this);
+  instance_ = NULL;
+}
+
+// static
+void OzonePlatform::InitializeForUI() {
+  CreateInstance();
+  if (g_platform_initialized_ui)
+    return;
+  g_platform_initialized_ui = true;
+  instance_->InitializeUI();
+  // This is deliberately created after initializing so that the platform can
+  // create its own version of DDM.
+  DeviceDataManager::CreateInstance();
+}
+
+// static
+void OzonePlatform::InitializeForGPU() {
+  CreateInstance();
+  if (g_platform_initialized_gpu)
+    return;
+  g_platform_initialized_gpu = true;
+  instance_->InitializeGPU();
+}
+
+// static
+OzonePlatform* OzonePlatform::GetInstance() {
+  DCHECK(instance_) << "OzonePlatform is not initialized";
+  return instance_;
+}
+
+// static
+void OzonePlatform::CreateInstance() {
+  if (!instance_) {
+    TRACE_EVENT1("ozone",
+                 "OzonePlatform::Initialize",
+                 "platform",
+                 GetOzonePlatformName());
+    scoped_ptr<OzonePlatform> platform =
+        PlatformObject<OzonePlatform>::Create();
+
+    // TODO(spang): Currently need to leak this object.
+    OzonePlatform* pl = platform.release();
+    DCHECK_EQ(instance_, pl);
+  }
+}
+
+// static
+OzonePlatform* OzonePlatform::instance_;
+
+}  // namespace ui