src/ui/ozone/ozone_platform.cc

   1 // Copyright 2013 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/base/cursor/ozone/cursor_factory_ozone.h"
   9 #include "ui/events/ozone/event_factory_ozone.h"
  10 #include "ui/gfx/ozone/surface_factory_ozone.h"
  11 #include "ui/ozone/ime/input_method_context_factory_ozone.h"
  12 #include "ui/ozone/ozone_platform.h"
  13 #include "ui/ozone/ozone_platform_list.h"
  14 #include "ui/ozone/ozone_switches.h"
  15
  16 namespace ui {
  17
  18 namespace {
  19
  20 // Helper to construct an OzonePlatform by name using the platform list.
  21 OzonePlatform* CreatePlatform(const std::string& platform_name) {
  22   // Search for a matching platform in the list.
  23   for (int i = 0; i < kOzonePlatformCount; ++i)
  24     if (platform_name == kOzonePlatforms[i].name)
  25       return kOzonePlatforms[i].constructor();
  26
  27   LOG(FATAL) << "Invalid ozone platform: " << platform_name;
  28   return NULL;  // not reached
  29 }
  30
  31 // Returns the name of the platform to use (value of --ozone-platform flag).
  32 std::string GetPlatformName() {
  33   // The first platform is the default.
  34   if (!CommandLine::ForCurrentProcess()->HasSwitch(switches::kOzonePlatform) &&
  35       kOzonePlatformCount > 0)
  36     return kOzonePlatforms[0].name;
  37   return CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
  38       switches::kOzonePlatform);
  39 }
  40
  41 }  // namespace
  42
  43 OzonePlatform::OzonePlatform() {}
  44
  45 OzonePlatform::~OzonePlatform() {
  46   gfx::SurfaceFactoryOzone::SetInstance(NULL);
  47   ui::EventFactoryOzone::SetInstance(NULL);
  48   ui::CursorFactoryOzone::SetInstance(NULL);
  49 }
  50
  51 // static
  52 void OzonePlatform::Initialize() {
  53   if (instance_)
  54     return;
  55
  56   std::string platform = GetPlatformName();
  57
  58   TRACE_EVENT1("ozone", "OzonePlatform::Initialize", "platform", platform);
  59
  60   instance_ = CreatePlatform(platform);
  61
  62   // Inject ozone interfaces.
  63   gfx::SurfaceFactoryOzone::SetInstance(instance_->GetSurfaceFactoryOzone());
  64   ui::EventFactoryOzone::SetInstance(instance_->GetEventFactoryOzone());
  65   ui::InputMethodContextFactoryOzone::SetInstance(
  66       instance_->GetInputMethodContextFactoryOzone());
  67   ui::CursorFactoryOzone::SetInstance(instance_->GetCursorFactoryOzone());
  68 }
  69
  70 // static
  71 OzonePlatform* OzonePlatform::GetInstance() {
  72   CHECK(instance_) << "OzonePlatform is not initialized";
  73   return instance_;
  74 }
  75
  76 // static
  77 OzonePlatform* OzonePlatform::instance_;
  78
  79 }  // namespace ui