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