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