Implement the gamepad API in the IPC proxy

content/browser/gamepad/platform_data_fetcher_win.cc

Index: content/browser/gamepad/platform_data_fetcher_win.cc
diff --git a/content/browser/gamepad/platform_data_fetcher_win.cc b/content/browser/gamepad/platform_data_fetcher_win.cc
deleted file mode 100644
index 92587a4df2c0057f76f0a82f79914e7516f1fd0c..0000000000000000000000000000000000000000
--- a/content/browser/gamepad/platform_data_fetcher_win.cc
+++ /dev/null
@@ -1,168 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "content/browser/gamepad/platform_data_fetcher_win.h"
-
-#include "base/debug/trace_event.h"
-#include "content/common/gamepad_messages.h"
-#include "content/common/gamepad_hardware_buffer.h"
-
-namespace content {
-
-using namespace WebKit;
-
-namespace {
-
-// See http://goo.gl/5VSJR. These are not available in all versions of the
-// header, but they can be returned from the driver, so we define our own
-// versions here.
-static const BYTE kDeviceSubTypeGamepad = 1;
-static const BYTE kDeviceSubTypeWheel = 2;
-static const BYTE kDeviceSubTypeArcadeStick = 3;
-static const BYTE kDeviceSubTypeFlightStick = 4;
-static const BYTE kDeviceSubTypeDancePad = 5;
-static const BYTE kDeviceSubTypeGuitar = 6;
-static const BYTE kDeviceSubTypeGuitarAlternate = 7;
-static const BYTE kDeviceSubTypeDrumKit = 8;
-static const BYTE kDeviceSubTypeGuitarBass = 11;
-static const BYTE kDeviceSubTypeArcadePad = 19;
-
-float NormalizeAxis(SHORT value) {
-  return ((value + 32768.f) / 32767.5f) - 1.f;
-}
-
-const WebUChar* const GamepadSubTypeName(BYTE sub_type) {
-  switch (sub_type) {
-    case kDeviceSubTypeGamepad: return L"GAMEPAD";
-    case kDeviceSubTypeWheel: return L"WHEEL";
-    case kDeviceSubTypeArcadeStick: return L"ARCADE_STICK";
-    case kDeviceSubTypeFlightStick: return L"FLIGHT_STICK";
-    case kDeviceSubTypeDancePad: return L"DANCE_PAD";
-    case kDeviceSubTypeGuitar: return L"GUITAR";
-    case kDeviceSubTypeGuitarAlternate: return L"GUITAR_ALTERNATE";
-    case kDeviceSubTypeDrumKit: return L"DRUM_KIT";
-    case kDeviceSubTypeGuitarBass: return L"GUITAR_BASS";
-    case kDeviceSubTypeArcadePad: return L"ARCADE_PAD";
-    default: return L"<UNKNOWN>";
-  }
-}
-
-}  // namespace
-
-GamepadPlatformDataFetcherWin::GamepadPlatformDataFetcherWin()
-    : xinput_dll_(FilePath(FILE_PATH_LITERAL("xinput1_3.dll"))),
-      xinput_available_(GetXinputDllFunctions()) {
-}
-
-GamepadPlatformDataFetcherWin::~GamepadPlatformDataFetcherWin() {
-}
-
-void GamepadPlatformDataFetcherWin::GetGamepadData(WebGamepads* pads,
-                                        bool devices_changed_hint) {
-  TRACE_EVENT0("GAMEPAD", "GetGamepadData");
-
-  // If there's no XInput DLL on the system, early out so that we don't
-  // call any other XInput functions.
-  if (!xinput_available_) {
-    pads->length = 0;
-    return;
-  }
-
-  pads->length = WebGamepads::itemsLengthCap;
-
-  // If we got notification that system devices have been updated, then
-  // run GetCapabilities to update the connected status and the device
-  // identifier. It can be slow to do to both GetCapabilities and
-  // GetState on unconnected devices, so we want to avoid a 2-5ms pause
-  // here by only doing this when the devices are updated (despite
-  // documentation claiming it's OK to call it any time).
-  if (devices_changed_hint) {
-    for (unsigned i = 0; i < WebGamepads::itemsLengthCap; ++i) {
-      WebGamepad& pad = pads->items[i];
-      TRACE_EVENT1("GAMEPAD", "GetCapabilities", "id", i);
-      XINPUT_CAPABILITIES caps;
-      DWORD res = xinput_get_capabilities_(i, XINPUT_FLAG_GAMEPAD, &caps);
-      if (res == ERROR_DEVICE_NOT_CONNECTED) {
-        pad.connected = false;
-      } else {
-        pad.connected = true;
-        base::swprintf(pad.id,
-                       WebGamepad::idLengthCap,
-                       L"Xbox 360 Controller (XInput STANDARD %ls)",
-                       GamepadSubTypeName(caps.SubType));
-      }
-    }
-  }
-
-  // We've updated the connection state if necessary, now update the actual
-  // data for the devices that are connected.
-  for (unsigned i = 0; i < WebGamepads::itemsLengthCap; ++i) {
-    WebGamepad& pad = pads->items[i];
-
-    // We rely on device_changed and GetCapabilities to tell us that
-    // something's been connected, but we will mark as disconnected if
-    // GetState returns that we've lost the pad.
-    if (!pad.connected)
-      continue;
-
-    XINPUT_STATE state;
-    memset(&state, 0, sizeof(XINPUT_STATE));
-    TRACE_EVENT_BEGIN1("GAMEPAD", "XInputGetState", "id", i);
-    DWORD dwResult = xinput_get_state_(i, &state);
-    TRACE_EVENT_END1("GAMEPAD", "XInputGetState", "id", i);
-
-    if (dwResult == ERROR_SUCCESS) {
-      pad.timestamp = state.dwPacketNumber;
-      pad.buttonsLength = 0;
-#define ADD(b) pad.buttons[pad.buttonsLength++] = \
-    ((state.Gamepad.wButtons & (b)) ? 1.0 : 0.0);
-      ADD(XINPUT_GAMEPAD_A);
-      ADD(XINPUT_GAMEPAD_B);
-      ADD(XINPUT_GAMEPAD_X);
-      ADD(XINPUT_GAMEPAD_Y);
-      ADD(XINPUT_GAMEPAD_LEFT_SHOULDER);
-      ADD(XINPUT_GAMEPAD_RIGHT_SHOULDER);
-      pad.buttons[pad.buttonsLength++] = state.Gamepad.bLeftTrigger / 255.0;
-      pad.buttons[pad.buttonsLength++] = state.Gamepad.bRightTrigger / 255.0;
-      ADD(XINPUT_GAMEPAD_BACK);
-      ADD(XINPUT_GAMEPAD_START);
-      ADD(XINPUT_GAMEPAD_LEFT_THUMB);
-      ADD(XINPUT_GAMEPAD_RIGHT_THUMB);
-      ADD(XINPUT_GAMEPAD_DPAD_UP);
-      ADD(XINPUT_GAMEPAD_DPAD_DOWN);
-      ADD(XINPUT_GAMEPAD_DPAD_LEFT);
-      ADD(XINPUT_GAMEPAD_DPAD_RIGHT);
-#undef ADD
-      pad.axesLength = 0;
-      // XInput are +up/+right, -down/-left, we want -up/-left.
-      pad.axes[pad.axesLength++] = NormalizeAxis(state.Gamepad.sThumbLX);
-      pad.axes[pad.axesLength++] = -NormalizeAxis(state.Gamepad.sThumbLY);
-      pad.axes[pad.axesLength++] = NormalizeAxis(state.Gamepad.sThumbRX);
-      pad.axes[pad.axesLength++] = -NormalizeAxis(state.Gamepad.sThumbRY);
-    } else {
-      pad.connected = false;
-    }
-  }
-}
-
-bool GamepadPlatformDataFetcherWin::GetXinputDllFunctions() {
-  xinput_get_capabilities_ = NULL;
-  xinput_get_state_ = NULL;
-  xinput_enable_ = static_cast<XInputEnableFunc>(
-      xinput_dll_.GetFunctionPointer("XInputEnable"));
-  if (!xinput_enable_)
-    return false;
-  xinput_get_capabilities_ = static_cast<XInputGetCapabilitiesFunc>(
-      xinput_dll_.GetFunctionPointer("XInputGetCapabilities"));
-  if (!xinput_get_capabilities_)
-    return false;
-  xinput_get_state_ = static_cast<XInputGetStateFunc>(
-      xinput_dll_.GetFunctionPointer("XInputGetState"));
-  if (!xinput_get_state_)
-    return false;
-  xinput_enable_(true);
-  return true;
-}
-
-}  // namespace content