Add gamepad data fetcher for Linux

content/browser/gamepad/data_fetcher_win.cc

Index: content/browser/gamepad/data_fetcher_win.cc
diff --git a/content/browser/gamepad/data_fetcher_win.cc b/content/browser/gamepad/data_fetcher_win.cc
deleted file mode 100644
index 4cb874d889ea915d751d5816a8bcb6c89797c54c..0000000000000000000000000000000000000000
--- a/content/browser/gamepad/data_fetcher_win.cc
+++ /dev/null
@@ -1,173 +0,0 @@
-// Copyright (c) 2011 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/data_fetcher_win.h"
-
-#include "base/debug/trace_event.h"
-#include "content/common/gamepad_messages.h"
-#include "content/common/gamepad_hardware_buffer.h"
-
-#include <delayimp.h>
-
-#pragma comment(lib, "delayimp.lib")
-#pragma comment(lib, "xinput.lib")
-
-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;
-
-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>";
-  }
-}
-
-// Trap only the exceptions that DELAYLOAD can throw, otherwise rethrow.
-// See http://msdn.microsoft.com/en-us/library/1c9e046h(v=VS.90).aspx.
-LONG WINAPI DelayLoadDllExceptionFilter(PEXCEPTION_POINTERS pExcPointers) {
- LONG disposition = EXCEPTION_EXECUTE_HANDLER;
- switch (pExcPointers->ExceptionRecord->ExceptionCode) {
-   case VcppException(ERROR_SEVERITY_ERROR, ERROR_MOD_NOT_FOUND):
-   case VcppException(ERROR_SEVERITY_ERROR, ERROR_PROC_NOT_FOUND):
-      break;
-   default:
-      // Exception is not related to delay loading.
-      disposition = EXCEPTION_CONTINUE_SEARCH;
-      break;
-   }
-   return disposition;
-}
-
-bool EnableXInput() {
-  // We have specified DELAYLOAD for xinput1_3.dll. If the DLL is not
-  // installed (XP w/o DirectX redist installed), we disable functionality.
-  __try {
-    ;//XInputEnable(true);
-  } __except(DelayLoadDllExceptionFilter(GetExceptionInformation())) {
-    return false;
-  }
-  return true;
-}
-
-}
-
-GamepadDataFetcherWindows::GamepadDataFetcherWindows()
-    : xinput_available_(EnableXInput()) {
-}
-
-void GamepadDataFetcherWindows::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 = XInputGetCapabilities(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 %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 = XInputGetState(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++] = state.Gamepad.sThumbLX / 32767.0;
-      pad.axes[pad.axesLength++] = -state.Gamepad.sThumbLY / 32767.0;
-      pad.axes[pad.axesLength++] = state.Gamepad.sThumbRX / 32767.0;
-      pad.axes[pad.axesLength++] = -state.Gamepad.sThumbRY / 32767.0;
-    } else {
-      pad.connected = false;
-    }
-  }
-}
-
-} // namespace content