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      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/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
     82