ui/ozone/public/ozone_platform.cc

   1 // Copyright 2014 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 "base/command_line.h"
   6 #include "base/debug/trace_event.h"
   7 #include "base/logging.h"
   8 #include "ui/events/devices/device_data_manager.h"
   9 #include "ui/ozone/platform_object.h"
  10 #include "ui/ozone/platform_selection.h"
  11 #include "ui/ozone/public/ozone_platform.h"
  12 #include "ui/ozone/public/ozone_switches.h"
  13
  14 namespace ui {
  15
  16 namespace {
  17
  18 bool g_platform_initialized_ui = false;
  19 bool g_platform_initialized_gpu = false;
  20
  21 }
  22
  23 OzonePlatform::OzonePlatform() {
  24   DCHECK(!instance_) << "There should only be a single OzonePlatform.";
  25   instance_ = this;
  26   g_platform_initialized_ui = false;
  27   g_platform_initialized_gpu = false;
  28 }
  29
  30 OzonePlatform::~OzonePlatform() {
  31   DCHECK_EQ(instance_, this);
  32   instance_ = NULL;
  33 }
  34
  35 // static
  36 void OzonePlatform::InitializeForUI() {
  37   CreateInstance();
  38   if (g_platform_initialized_ui)
  39     return;
  40   g_platform_initialized_ui = true;
  41   instance_->InitializeUI();
  42   // This is deliberately created after initializing so that the platform can
  43   // create its own version of DDM.
  44   DeviceDataManager::CreateInstance();
  45 }
  46
  47 // static
  48 void OzonePlatform::InitializeForGPU() {
  49   CreateInstance();
  50   if (g_platform_initialized_gpu)
  51     return;
  52   g_platform_initialized_gpu = true;
  53   instance_->InitializeGPU();
  54 }
  55
  56 // static
  57 OzonePlatform* OzonePlatform::GetInstance() {
  58   DCHECK(instance_) << "OzonePlatform is not initialized";
  59   return instance_;
  60 }
  61
  62 // static
  63 void OzonePlatform::CreateInstance() {
  64   if (!instance_) {
  65     TRACE_EVENT1("ozone",
  66                  "OzonePlatform::Initialize",
  67                  "platform",
  68                  GetOzonePlatformName());
  69     scoped_ptr<OzonePlatform> platform =
  70         PlatformObject<OzonePlatform>::Create();
  71
  72     // TODO(spang): Currently need to leak this object.
  73     OzonePlatform* pl = platform.release();
  74     DCHECK_EQ(instance_, pl);
  75   }
  76 }
  77
  78 // static
  79 OzonePlatform* OzonePlatform::instance_;
  80
  81 }  // namespace ui