device/gamepad/raw_input_gamepad_device_win.cc - chromium/src - Git at Google

 // Copyright 2018 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 "raw_input_gamepad_device_win.h"

 #include "base/stl_util.h"
 #include "device/gamepad/gamepad_blocklist.h"
 #include "device/gamepad/gamepad_data_fetcher.h"

 namespace device {

 namespace {

 float NormalizeAxis(long value, long min, long max) {
   return (2.f * (value - min) / static_cast<float>(max - min)) - 1.f;
 }

 unsigned long GetBitmask(unsigned short bits) {
   return (1 << bits) - 1;
 }

 const uint32_t kGenericDesktopUsagePage = 0x01;
 const uint32_t kGameControlsUsagePage = 0x05;
 const uint32_t kButtonUsagePage = 0x09;
 const uint32_t kConsumerUsagePage = 0x0c;

 const uint32_t kAxisMinimumUsageNumber = 0x30;
 const uint32_t kSystemMainMenuUsageNumber = 0x85;
 const uint32_t kPowerUsageNumber = 0x30;
 const uint32_t kSearchUsageNumber = 0x0221;
 const uint32_t kHomeUsageNumber = 0x0223;
 const uint32_t kBackUsageNumber = 0x0224;

 // The fetcher will collect all HID usages from the Button usage page and any
 // additional usages listed below.
 struct SpecialUsages {
   const uint16_t usage_page;
   const uint16_t usage;
 } kSpecialUsages[] = {
     // Xbox One S pre-FW update reports Xbox button as SystemMainMenu over BT.
     {kGenericDesktopUsagePage, kSystemMainMenuUsageNumber},
     // Power is used for the Guide button on the Nvidia Shield 2015 gamepad.
     {kConsumerUsagePage, kPowerUsageNumber},
     // Search is used for the Guide button on the Nvidia Shield 2017 gamepad.
     {kConsumerUsagePage, kSearchUsageNumber},
     // Start, Back, and Guide buttons are often reported as Consumer Home or
     // Back.
     {kConsumerUsagePage, kHomeUsageNumber},
     {kConsumerUsagePage, kBackUsageNumber},
 };
 const size_t kSpecialUsagesLen = base::size(kSpecialUsages);

 }  // namespace

 RawInputGamepadDeviceWin::RawInputGamepadDeviceWin(
     HANDLE device_handle,
     int source_id,
     HidDllFunctionsWin* hid_functions)
     : handle_(device_handle),
       source_id_(source_id),
       last_update_timestamp_(GamepadDataFetcher::CurrentTimeInMicroseconds()),
       hid_functions_(hid_functions) {
   ::ZeroMemory(buttons_, sizeof(buttons_));
   ::ZeroMemory(axes_, sizeof(axes_));

   if (hid_functions_->IsValid())
     is_valid_ = QueryDeviceInfo();

   if (is_valid_) {
     if (Dualshock4ControllerWin::IsDualshock4(vendor_id_, product_id_)) {
       dualshock4_ = std::make_unique<Dualshock4ControllerWin>(handle_);
     } else if (HidHapticGamepadWin::IsHidHaptic(vendor_id_, product_id_)) {
       hid_haptics_ =
           HidHapticGamepadWin::Create(vendor_id_, product_id_, handle_);
     }
   }
 }

 RawInputGamepadDeviceWin::~RawInputGamepadDeviceWin() = default;

 // static
 bool RawInputGamepadDeviceWin::IsGamepadUsageId(uint16_t usage) {
   return usage == kGenericDesktopJoystick || usage == kGenericDesktopGamePad ||
          usage == kGenericDesktopMultiAxisController;
 }

 void RawInputGamepadDeviceWin::DoShutdown() {
   if (dualshock4_)
     dualshock4_->Shutdown();
   dualshock4_.reset();
   if (hid_haptics_)
     hid_haptics_->Shutdown();
   hid_haptics_.reset();
 }

 void RawInputGamepadDeviceWin::UpdateGamepad(RAWINPUT* input) {
   DCHECK(hid_functions_->IsValid());
   NTSTATUS status;

   // Query button state.
   if (buttons_length_ > 0) {
     // Clear the button state
     ::ZeroMemory(buttons_, sizeof(buttons_));
     ULONG buttons_length = 0;

     hid_functions_->HidPGetUsagesEx()(
         HidP_Input, 0, nullptr, &buttons_length, preparsed_data_,
         reinterpret_cast<PCHAR>(input->data.hid.bRawData),
         input->data.hid.dwSizeHid);

     std::unique_ptr<USAGE_AND_PAGE[]> usages(
         new USAGE_AND_PAGE[buttons_length]);
     status = hid_functions_->HidPGetUsagesEx()(
         HidP_Input, 0, usages.get(), &buttons_length, preparsed_data_,
         reinterpret_cast<PCHAR>(input->data.hid.bRawData),
         input->data.hid.dwSizeHid);

     if (status == HIDP_STATUS_SUCCESS) {
       // Set each reported button to true.
       for (size_t j = 0; j < buttons_length; j++) {
         uint16_t usage_page = usages[j].UsagePage;
         uint16_t usage = usages[j].Usage;
         if (usage_page == kButtonUsagePage && usage > 0) {
           size_t button_index = size_t{usage - 1};
           if (button_index < Gamepad::kButtonsLengthCap)
             buttons_[button_index] = true;
         } else if (usage_page != kButtonUsagePage &&
                    !special_button_map_.empty()) {
           for (size_t special_index = 0; special_index < kSpecialUsagesLen;
                ++special_index) {
             int button_index = special_button_map_[special_index];
             if (button_index < 0)
               continue;
             const auto& special = kSpecialUsages[special_index];
             if (usage_page == special.usage_page && usage == special.usage)
               buttons_[button_index] = true;
           }
         }
       }
     }
   }

   // Query axis state.
   ULONG axis_value = 0;
   LONG scaled_axis_value = 0;
   for (uint32_t i = 0; i < axes_length_; i++) {
     RawGamepadAxis* axis = &axes_[i];

     // If the min is < 0 we have to query the scaled value, otherwise we need
     // the normal unscaled value.
     if (axis->caps.LogicalMin < 0) {
       status = hid_functions_->HidPGetScaledUsageValue()(
           HidP_Input, axis->caps.UsagePage, 0, axis->caps.Range.UsageMin,
           &scaled_axis_value, preparsed_data_,
           reinterpret_cast<PCHAR>(input->data.hid.bRawData),
           input->data.hid.dwSizeHid);
       if (status == HIDP_STATUS_SUCCESS) {
         axis->value = NormalizeAxis(scaled_axis_value, axis->caps.PhysicalMin,
                                     axis->caps.PhysicalMax);
       }
     } else {
       status = hid_functions_->HidPGetUsageValue()(
           HidP_Input, axis->caps.UsagePage, 0, axis->caps.Range.UsageMin,
           &axis_value, preparsed_data_,
           reinterpret_cast<PCHAR>(input->data.hid.bRawData),
           input->data.hid.dwSizeHid);
       if (status == HIDP_STATUS_SUCCESS) {
         axis->value = NormalizeAxis(axis_value & axis->bitmask,
                                     axis->caps.LogicalMin & axis->bitmask,
                                     axis->caps.LogicalMax & axis->bitmask);
       }
     }
   }

   last_update_timestamp_ = GamepadDataFetcher::CurrentTimeInMicroseconds();
 }

 void RawInputGamepadDeviceWin::ReadPadState(Gamepad* pad) const {
   DCHECK(pad);

   pad->timestamp = last_update_timestamp_;
   pad->buttons_length = buttons_length_;
   pad->axes_length = axes_length_;

   for (unsigned int i = 0; i < buttons_length_; i++) {
     pad->buttons[i].pressed = buttons_[i];
     pad->buttons[i].value = buttons_[i] ? 1.0 : 0.0;
   }

   for (unsigned int i = 0; i < axes_length_; i++)
     pad->axes[i] = axes_[i].value;
 }

 bool RawInputGamepadDeviceWin::SupportsVibration() const {
   return dualshock4_ || hid_haptics_;
 }

 void RawInputGamepadDeviceWin::SetVibration(double strong_magnitude,
                                             double weak_magnitude) {
   if (dualshock4_)
     dualshock4_->SetVibration(strong_magnitude, weak_magnitude);
   else if (hid_haptics_)
     hid_haptics_->SetVibration(strong_magnitude, weak_magnitude);
 }

 bool RawInputGamepadDeviceWin::QueryDeviceInfo() {
   // Fetch HID properties (RID_DEVICE_INFO_HID) for this device. This includes
   // |vendor_id_|, |product_id_|, |version_number_|, and |usage_|.
   if (!QueryHidInfo())
     return false;

   // Make sure this device is of a type that we want to observe.
   if (!IsGamepadUsageId(usage_))
     return false;

   // Filter out devices that have gamepad-like HID usages but aren't gamepads.
   if (GamepadIsExcluded(vendor_id_, product_id_))
     return false;

   // Fetch the device's |name_| (RIDI_DEVICENAME).
   if (!QueryDeviceName())
     return false;

   // From the name we can guess at the bus type. PCI HID devices have "VEN" and
   // "DEV" instead of "VID" and "PID". PCI HID devices are typically not
   // gamepads and are ignored.
   // Example PCI device name: \\?\HID#VEN_1234&DEV_ABCD
   // TODO(crbug/881539): Potentially allow PCI HID devices to be enumerated, but
   // prefer known gamepads when there is contention.
   std::wstring pci_prefix = L"\\\\?\\HID#VEN_";
   if (!name_.compare(0, pci_prefix.size(), pci_prefix))
     return false;

   // Filter out the virtual digitizer, which was observed after remote desktop.
   // See https://crbug.com/961774 for details.
   if (name_ == L"\\\\?\\VIRTUAL_DIGITIZER")
     return false;

   // Fetch the human-friendly |product_string_|, if available.
   if (!QueryProductString())
     product_string_ = L"Unknown Gamepad";

   // Fetch information about the buttons and axes on this device. This sets
   // |buttons_length_| and |axes_length_| to their correct values and populates
   // |axes_| with capabilities info.
   if (!QueryDeviceCapabilities())
     return false;

   // Gamepads must have at least one button or axis.
   if (buttons_length_ == 0 && axes_length_ == 0)
     return false;

   return true;
 }

 bool RawInputGamepadDeviceWin::QueryHidInfo() {
   UINT size = 0;

   UINT result =
       ::GetRawInputDeviceInfo(handle_, RIDI_DEVICEINFO, nullptr, &size);
   if (result == static_cast<UINT>(-1)) {
     PLOG(ERROR) << "GetRawInputDeviceInfo() failed";
     return false;
   }
   DCHECK_EQ(0u, result);

   std::unique_ptr<uint8_t[]> buffer(new uint8_t[size]);
   result =
       ::GetRawInputDeviceInfo(handle_, RIDI_DEVICEINFO, buffer.get(), &size);
   if (result == static_cast<UINT>(-1)) {
     PLOG(ERROR) << "GetRawInputDeviceInfo() failed";
     return false;
   }
   DCHECK_EQ(size, result);
   RID_DEVICE_INFO* device_info =
       reinterpret_cast<RID_DEVICE_INFO*>(buffer.get());

   DCHECK_EQ(device_info->dwType, static_cast<DWORD>(RIM_TYPEHID));
   vendor_id_ = static_cast<uint16_t>(device_info->hid.dwVendorId);
   product_id_ = static_cast<uint16_t>(device_info->hid.dwProductId);
   version_number_ = static_cast<uint16_t>(device_info->hid.dwVersionNumber);
   usage_ = device_info->hid.usUsage;

   return true;
 }

 bool RawInputGamepadDeviceWin::QueryDeviceName() {
   UINT size = 0;

   UINT result =
       ::GetRawInputDeviceInfo(handle_, RIDI_DEVICENAME, nullptr, &size);
   if (result == static_cast<UINT>(-1)) {
     PLOG(ERROR) << "GetRawInputDeviceInfo() failed";
     return false;
   }
   DCHECK_EQ(0u, result);

   std::unique_ptr<wchar_t[]> buffer(new wchar_t[size]);
   result =
       ::GetRawInputDeviceInfo(handle_, RIDI_DEVICENAME, buffer.get(), &size);
   if (result == static_cast<UINT>(-1)) {
     PLOG(ERROR) << "GetRawInputDeviceInfo() failed";
     return false;
   }
   DCHECK_EQ(size, result);

   name_ = buffer.get();

   return true;
 }

 bool RawInputGamepadDeviceWin::QueryProductString() {
   DCHECK(hid_functions_);
   DCHECK(hid_functions_->IsValid());
   base::win::ScopedHandle hid_handle(::CreateFile(
       name_.c_str(), GENERIC_READ | GENERIC_WRITE,
       FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, NULL, NULL));
   if (!hid_handle.IsValid())
     return false;
   product_string_.resize(Gamepad::kIdLengthCap);
   return hid_functions_->HidDGetProductString()(
       hid_handle.Get(), &product_string_.front(), Gamepad::kIdLengthCap);
 }

 bool RawInputGamepadDeviceWin::QueryDeviceCapabilities() {
   DCHECK(hid_functions_);
   DCHECK(hid_functions_->IsValid());
   UINT size = 0;

   UINT result =
       ::GetRawInputDeviceInfo(handle_, RIDI_PREPARSEDDATA, nullptr, &size);
   if (result == static_cast<UINT>(-1)) {
     PLOG(ERROR) << "GetRawInputDeviceInfo() failed";
     return false;
   }
   DCHECK_EQ(0u, result);

   ppd_buffer_.reset(new uint8_t[size]);
   preparsed_data_ = reinterpret_cast<PHIDP_PREPARSED_DATA>(ppd_buffer_.get());
   result = ::GetRawInputDeviceInfo(handle_, RIDI_PREPARSEDDATA,
                                    ppd_buffer_.get(), &size);
   if (result == static_cast<UINT>(-1)) {
     PLOG(ERROR) << "GetRawInputDeviceInfo() failed";
     return false;
   }
   DCHECK_EQ(size, result);

   HIDP_CAPS caps;
   NTSTATUS status = hid_functions_->HidPGetCaps()(preparsed_data_, &caps);
   DCHECK_EQ(HIDP_STATUS_SUCCESS, status);

   QueryButtonCapabilities(caps.NumberInputButtonCaps);
   QueryAxisCapabilities(caps.NumberInputValueCaps);

   return true;
 }

 void RawInputGamepadDeviceWin::QueryButtonCapabilities(uint16_t button_count) {
   DCHECK(hid_functions_);
   DCHECK(hid_functions_->IsValid());
   if (button_count > 0) {
     std::unique_ptr<HIDP_BUTTON_CAPS[]> button_caps(
         new HIDP_BUTTON_CAPS[button_count]);
     NTSTATUS status = hid_functions_->HidPGetButtonCaps()(
         HidP_Input, button_caps.get(), &button_count, preparsed_data_);
     DCHECK_EQ(HIDP_STATUS_SUCCESS, status);

     // Keep track of which button indices are in use.
     std::vector<bool> button_indices_used(Gamepad::kButtonsLengthCap, false);

     // Collect all inputs from the Button usage page.
     QueryNormalButtonCapabilities(button_caps.get(), button_count,
                                   &button_indices_used);

     // Check for common gamepad buttons that are not on the Button usage page.
     QuerySpecialButtonCapabilities(button_caps.get(), button_count,
                                    &button_indices_used);
   }
 }

 void RawInputGamepadDeviceWin::QueryNormalButtonCapabilities(
     HIDP_BUTTON_CAPS button_caps[],
     uint16_t button_count,
     std::vector<bool>* button_indices_used) {
   DCHECK(button_caps);
   DCHECK(button_indices_used);

   // Collect all inputs from the Button usage page and assign button indices
   // based on the usage value.
   for (size_t i = 0; i < button_count; ++i) {
     uint16_t usage_page = button_caps[i].UsagePage;
     uint16_t usage_min = button_caps[i].Range.UsageMin;
     uint16_t usage_max = button_caps[i].Range.UsageMax;
     if (usage_min == 0 || usage_max == 0)
       continue;
     size_t button_index_min = size_t{usage_min - 1};
     size_t button_index_max = size_t{usage_max - 1};
     if (usage_page == kButtonUsagePage &&
         button_index_min < Gamepad::kButtonsLengthCap) {
       button_index_max =
           std::min(Gamepad::kButtonsLengthCap - 1, button_index_max);
       buttons_length_ = std::max(buttons_length_, button_index_max + 1);
       for (size_t j = button_index_min; j <= button_index_max; ++j)
         (*button_indices_used)[j] = true;
     }
   }
 }

 void RawInputGamepadDeviceWin::QuerySpecialButtonCapabilities(
     HIDP_BUTTON_CAPS button_caps[],
     uint16_t button_count,
     std::vector<bool>* button_indices_used) {
   DCHECK(button_caps);
   DCHECK(button_indices_used);

   // Check for common gamepad buttons that are not on the Button usage page.
   std::vector<bool> has_special_usage(kSpecialUsagesLen, false);
   size_t unmapped_button_count = 0;
   for (size_t i = 0; i < button_count; ++i) {
     uint16_t usage_page = button_caps[i].UsagePage;
     uint16_t usage_min = button_caps[i].Range.UsageMin;
     uint16_t usage_max = button_caps[i].Range.UsageMax;
     for (size_t special_index = 0; special_index < kSpecialUsagesLen;
          ++special_index) {
       const auto& special = kSpecialUsages[special_index];
       if (usage_page == special.usage_page && usage_min <= special.usage &&
           usage_max >= special.usage) {
         has_special_usage[special_index] = true;
         ++unmapped_button_count;
       }
     }
   }

   special_button_map_.clear();
   if (unmapped_button_count > 0) {
     // Insert special buttons at unused button indices.
     special_button_map_.resize(kSpecialUsagesLen, -1);
     size_t button_index = 0;
     for (size_t special_index = 0; special_index < kSpecialUsagesLen;
          ++special_index) {
       if (!has_special_usage[special_index])
         continue;

       // Advance to the next unused button index.
       while (button_index < Gamepad::kButtonsLengthCap &&
              (*button_indices_used)[button_index]) {
         ++button_index;
       }
       if (button_index >= Gamepad::kButtonsLengthCap)
         break;

       special_button_map_[special_index] = button_index;
       (*button_indices_used)[button_index] = true;
       ++button_index;

       if (--unmapped_button_count == 0)
         break;
     }
   }
 }

 void RawInputGamepadDeviceWin::QueryAxisCapabilities(uint16_t axis_count) {
   DCHECK(hid_functions_);
   DCHECK(hid_functions_->IsValid());
   std::unique_ptr<HIDP_VALUE_CAPS[]> axes_caps(new HIDP_VALUE_CAPS[axis_count]);
   hid_functions_->HidPGetValueCaps()(HidP_Input, axes_caps.get(), &axis_count,
                                      preparsed_data_);

   bool mapped_all_axes = true;

   for (size_t i = 0; i < axis_count; i++) {
     size_t axis_index = axes_caps[i].Range.UsageMin - kAxisMinimumUsageNumber;
     if (axis_index < Gamepad::kAxesLengthCap && !axes_[axis_index].active) {
       axes_[axis_index].caps = axes_caps[i];
       axes_[axis_index].value = 0;
       axes_[axis_index].active = true;
       axes_[axis_index].bitmask = GetBitmask(axes_caps[i].BitSize);
       axes_length_ = std::max(axes_length_, axis_index + 1);
     } else {
       mapped_all_axes = false;
     }
   }

   if (!mapped_all_axes) {
     // For axes whose usage puts them outside the standard axesLengthCap range.
     size_t next_index = 0;
     for (size_t i = 0; i < axis_count; i++) {
       size_t usage = axes_caps[i].Range.UsageMin - kAxisMinimumUsageNumber;
       if (usage >= Gamepad::kAxesLengthCap &&
           axes_caps[i].UsagePage <= kGameControlsUsagePage) {
         for (; next_index < Gamepad::kAxesLengthCap; ++next_index) {
           if (!axes_[next_index].active)
             break;
         }
         if (next_index < Gamepad::kAxesLengthCap) {
           axes_[next_index].caps = axes_caps[i];
           axes_[next_index].value = 0;
           axes_[next_index].active = true;
           axes_[next_index].bitmask = GetBitmask(axes_caps[i].BitSize);
           axes_length_ = std::max(axes_length_, next_index + 1);
         }
       }

       if (next_index >= Gamepad::kAxesLengthCap)
         break;
     }
   }
 }

 }  // namespace device
	// Copyright 2018 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 "raw_input_gamepad_device_win.h"

	#include "base/stl_util.h"
	#include "device/gamepad/gamepad_blocklist.h"
	#include "device/gamepad/gamepad_data_fetcher.h"

	namespace device {

	namespace {

	float NormalizeAxis(long value, long min, long max) {
	return (2.f * (value - min) / static_cast<float>(max - min)) - 1.f;
	}

	unsigned long GetBitmask(unsigned short bits) {
	return (1 << bits) - 1;
	}

	const uint32_t kGenericDesktopUsagePage = 0x01;
	const uint32_t kGameControlsUsagePage = 0x05;
	const uint32_t kButtonUsagePage = 0x09;
	const uint32_t kConsumerUsagePage = 0x0c;

	const uint32_t kAxisMinimumUsageNumber = 0x30;
	const uint32_t kSystemMainMenuUsageNumber = 0x85;
	const uint32_t kPowerUsageNumber = 0x30;
	const uint32_t kSearchUsageNumber = 0x0221;
	const uint32_t kHomeUsageNumber = 0x0223;
	const uint32_t kBackUsageNumber = 0x0224;

	// The fetcher will collect all HID usages from the Button usage page and any
	// additional usages listed below.
	struct SpecialUsages {
	const uint16_t usage_page;
	const uint16_t usage;
	} kSpecialUsages[] = {
	// Xbox One S pre-FW update reports Xbox button as SystemMainMenu over BT.
	{kGenericDesktopUsagePage, kSystemMainMenuUsageNumber},
	// Power is used for the Guide button on the Nvidia Shield 2015 gamepad.
	{kConsumerUsagePage, kPowerUsageNumber},
	// Search is used for the Guide button on the Nvidia Shield 2017 gamepad.
	{kConsumerUsagePage, kSearchUsageNumber},
	// Start, Back, and Guide buttons are often reported as Consumer Home or
	// Back.
	{kConsumerUsagePage, kHomeUsageNumber},
	{kConsumerUsagePage, kBackUsageNumber},
	};
	const size_t kSpecialUsagesLen = base::size(kSpecialUsages);

	} // namespace

	RawInputGamepadDeviceWin::RawInputGamepadDeviceWin(
	HANDLE device_handle,
	int source_id,
	HidDllFunctionsWin* hid_functions)
	: handle_(device_handle),
	source_id_(source_id),
	last_update_timestamp_(GamepadDataFetcher::CurrentTimeInMicroseconds()),
	hid_functions_(hid_functions) {
	::ZeroMemory(buttons_, sizeof(buttons_));
	::ZeroMemory(axes_, sizeof(axes_));

	if (hid_functions_->IsValid())
	is_valid_ = QueryDeviceInfo();

	if (is_valid_) {
	if (Dualshock4ControllerWin::IsDualshock4(vendor_id_, product_id_)) {
	dualshock4_ = std::make_unique<Dualshock4ControllerWin>(handle_);
	} else if (HidHapticGamepadWin::IsHidHaptic(vendor_id_, product_id_)) {
	hid_haptics_ =
	HidHapticGamepadWin::Create(vendor_id_, product_id_, handle_);
	}
	}
	}

	RawInputGamepadDeviceWin::~RawInputGamepadDeviceWin() = default;

	// static
	bool RawInputGamepadDeviceWin::IsGamepadUsageId(uint16_t usage) {
	return usage == kGenericDesktopJoystick \|\| usage == kGenericDesktopGamePad \|\|
	usage == kGenericDesktopMultiAxisController;
	}

	void RawInputGamepadDeviceWin::DoShutdown() {
	if (dualshock4_)
	dualshock4_->Shutdown();
	dualshock4_.reset();
	if (hid_haptics_)
	hid_haptics_->Shutdown();
	hid_haptics_.reset();
	}

	void RawInputGamepadDeviceWin::UpdateGamepad(RAWINPUT* input) {
	DCHECK(hid_functions_->IsValid());
	NTSTATUS status;

	// Query button state.
	if (buttons_length_ > 0) {
	// Clear the button state
	::ZeroMemory(buttons_, sizeof(buttons_));
	ULONG buttons_length = 0;

	hid_functions_->HidPGetUsagesEx()(
	HidP_Input, 0, nullptr, &buttons_length, preparsed_data_,
	reinterpret_cast<PCHAR>(input->data.hid.bRawData),
	input->data.hid.dwSizeHid);

	std::unique_ptr<USAGE_AND_PAGE[]> usages(
	new USAGE_AND_PAGE[buttons_length]);
	status = hid_functions_->HidPGetUsagesEx()(
	HidP_Input, 0, usages.get(), &buttons_length, preparsed_data_,
	reinterpret_cast<PCHAR>(input->data.hid.bRawData),
	input->data.hid.dwSizeHid);

	if (status == HIDP_STATUS_SUCCESS) {
	// Set each reported button to true.
	for (size_t j = 0; j < buttons_length; j++) {
	uint16_t usage_page = usages[j].UsagePage;
	uint16_t usage = usages[j].Usage;
	if (usage_page == kButtonUsagePage && usage > 0) {
	size_t button_index = size_t{usage - 1};
	if (button_index < Gamepad::kButtonsLengthCap)
	buttons_[button_index] = true;
	} else if (usage_page != kButtonUsagePage &&
	!special_button_map_.empty()) {
	for (size_t special_index = 0; special_index < kSpecialUsagesLen;
	++special_index) {
	int button_index = special_button_map_[special_index];
	if (button_index < 0)
	continue;
	const auto& special = kSpecialUsages[special_index];
	if (usage_page == special.usage_page && usage == special.usage)
	buttons_[button_index] = true;
	}
	}
	}
	}
	}

	// Query axis state.
	ULONG axis_value = 0;
	LONG scaled_axis_value = 0;
	for (uint32_t i = 0; i < axes_length_; i++) {
	RawGamepadAxis* axis = &axes_[i];

	// If the min is < 0 we have to query the scaled value, otherwise we need
	// the normal unscaled value.
	if (axis->caps.LogicalMin < 0) {
	status = hid_functions_->HidPGetScaledUsageValue()(
	HidP_Input, axis->caps.UsagePage, 0, axis->caps.Range.UsageMin,
	&scaled_axis_value, preparsed_data_,
	reinterpret_cast<PCHAR>(input->data.hid.bRawData),
	input->data.hid.dwSizeHid);
	if (status == HIDP_STATUS_SUCCESS) {
	axis->value = NormalizeAxis(scaled_axis_value, axis->caps.PhysicalMin,
	axis->caps.PhysicalMax);
	}
	} else {
	status = hid_functions_->HidPGetUsageValue()(
	HidP_Input, axis->caps.UsagePage, 0, axis->caps.Range.UsageMin,
	&axis_value, preparsed_data_,
	reinterpret_cast<PCHAR>(input->data.hid.bRawData),
	input->data.hid.dwSizeHid);
	if (status == HIDP_STATUS_SUCCESS) {
	axis->value = NormalizeAxis(axis_value & axis->bitmask,
	axis->caps.LogicalMin & axis->bitmask,
	axis->caps.LogicalMax & axis->bitmask);
	}
	}
	}

	last_update_timestamp_ = GamepadDataFetcher::CurrentTimeInMicroseconds();
	}

	void RawInputGamepadDeviceWin::ReadPadState(Gamepad* pad) const {
	DCHECK(pad);

	pad->timestamp = last_update_timestamp_;
	pad->buttons_length = buttons_length_;
	pad->axes_length = axes_length_;

	for (unsigned int i = 0; i < buttons_length_; i++) {
	pad->buttons[i].pressed = buttons_[i];
	pad->buttons[i].value = buttons_[i] ? 1.0 : 0.0;
	}

	for (unsigned int i = 0; i < axes_length_; i++)
	pad->axes[i] = axes_[i].value;
	}

	bool RawInputGamepadDeviceWin::SupportsVibration() const {
	return dualshock4_ \|\| hid_haptics_;
	}

	void RawInputGamepadDeviceWin::SetVibration(double strong_magnitude,
	double weak_magnitude) {
	if (dualshock4_)
	dualshock4_->SetVibration(strong_magnitude, weak_magnitude);
	else if (hid_haptics_)
	hid_haptics_->SetVibration(strong_magnitude, weak_magnitude);
	}

	bool RawInputGamepadDeviceWin::QueryDeviceInfo() {
	// Fetch HID properties (RID_DEVICE_INFO_HID) for this device. This includes
	// \|vendor_id_\|, \|product_id_\|, \|version_number_\|, and \|usage_\|.
	if (!QueryHidInfo())
	return false;

	// Make sure this device is of a type that we want to observe.
	if (!IsGamepadUsageId(usage_))
	return false;

	// Filter out devices that have gamepad-like HID usages but aren't gamepads.
	if (GamepadIsExcluded(vendor_id_, product_id_))
	return false;

	// Fetch the device's \|name_\| (RIDI_DEVICENAME).
	if (!QueryDeviceName())
	return false;

	// From the name we can guess at the bus type. PCI HID devices have "VEN" and
	// "DEV" instead of "VID" and "PID". PCI HID devices are typically not
	// gamepads and are ignored.
	// Example PCI device name: \\?\HID#VEN_1234&DEV_ABCD
	// TODO(crbug/881539): Potentially allow PCI HID devices to be enumerated, but
	// prefer known gamepads when there is contention.
	std::wstring pci_prefix = L"\\\\?\\HID#VEN_";
	if (!name_.compare(0, pci_prefix.size(), pci_prefix))
	return false;

	// Filter out the virtual digitizer, which was observed after remote desktop.
	// See https://crbug.com/961774 for details.
	if (name_ == L"\\\\?\\VIRTUAL_DIGITIZER")
	return false;

	// Fetch the human-friendly \|product_string_\|, if available.
	if (!QueryProductString())
	product_string_ = L"Unknown Gamepad";

	// Fetch information about the buttons and axes on this device. This sets
	// \|buttons_length_\| and \|axes_length_\| to their correct values and populates
	// \|axes_\| with capabilities info.
	if (!QueryDeviceCapabilities())
	return false;

	// Gamepads must have at least one button or axis.
	if (buttons_length_ == 0 && axes_length_ == 0)
	return false;

	return true;
	}

	bool RawInputGamepadDeviceWin::QueryHidInfo() {
	UINT size = 0;

	UINT result =
	::GetRawInputDeviceInfo(handle_, RIDI_DEVICEINFO, nullptr, &size);
	if (result == static_cast<UINT>(-1)) {
	PLOG(ERROR) << "GetRawInputDeviceInfo() failed";
	return false;
	}
	DCHECK_EQ(0u, result);

	std::unique_ptr<uint8_t[]> buffer(new uint8_t[size]);
	result =
	::GetRawInputDeviceInfo(handle_, RIDI_DEVICEINFO, buffer.get(), &size);
	if (result == static_cast<UINT>(-1)) {
	PLOG(ERROR) << "GetRawInputDeviceInfo() failed";
	return false;
	}
	DCHECK_EQ(size, result);
	RID_DEVICE_INFO* device_info =
	reinterpret_cast<RID_DEVICE_INFO*>(buffer.get());

	DCHECK_EQ(device_info->dwType, static_cast<DWORD>(RIM_TYPEHID));
	vendor_id_ = static_cast<uint16_t>(device_info->hid.dwVendorId);
	product_id_ = static_cast<uint16_t>(device_info->hid.dwProductId);
	version_number_ = static_cast<uint16_t>(device_info->hid.dwVersionNumber);
	usage_ = device_info->hid.usUsage;

	return true;
	}

	bool RawInputGamepadDeviceWin::QueryDeviceName() {
	UINT size = 0;

	UINT result =
	::GetRawInputDeviceInfo(handle_, RIDI_DEVICENAME, nullptr, &size);
	if (result == static_cast<UINT>(-1)) {
	PLOG(ERROR) << "GetRawInputDeviceInfo() failed";
	return false;
	}
	DCHECK_EQ(0u, result);

	std::unique_ptr<wchar_t[]> buffer(new wchar_t[size]);
	result =
	::GetRawInputDeviceInfo(handle_, RIDI_DEVICENAME, buffer.get(), &size);
	if (result == static_cast<UINT>(-1)) {
	PLOG(ERROR) << "GetRawInputDeviceInfo() failed";
	return false;
	}
	DCHECK_EQ(size, result);

	name_ = buffer.get();

	return true;
	}

	bool RawInputGamepadDeviceWin::QueryProductString() {
	DCHECK(hid_functions_);
	DCHECK(hid_functions_->IsValid());
	base::win::ScopedHandle hid_handle(::CreateFile(
	name_.c_str(), GENERIC_READ \| GENERIC_WRITE,
	FILE_SHARE_READ \| FILE_SHARE_WRITE, NULL, OPEN_EXISTING, NULL, NULL));
	if (!hid_handle.IsValid())
	return false;
	product_string_.resize(Gamepad::kIdLengthCap);
	return hid_functions_->HidDGetProductString()(
	hid_handle.Get(), &product_string_.front(), Gamepad::kIdLengthCap);
	}

	bool RawInputGamepadDeviceWin::QueryDeviceCapabilities() {
	DCHECK(hid_functions_);
	DCHECK(hid_functions_->IsValid());
	UINT size = 0;

	UINT result =
	::GetRawInputDeviceInfo(handle_, RIDI_PREPARSEDDATA, nullptr, &size);
	if (result == static_cast<UINT>(-1)) {
	PLOG(ERROR) << "GetRawInputDeviceInfo() failed";
	return false;
	}
	DCHECK_EQ(0u, result);

	ppd_buffer_.reset(new uint8_t[size]);
	preparsed_data_ = reinterpret_cast<PHIDP_PREPARSED_DATA>(ppd_buffer_.get());
	result = ::GetRawInputDeviceInfo(handle_, RIDI_PREPARSEDDATA,
	ppd_buffer_.get(), &size);
	if (result == static_cast<UINT>(-1)) {
	PLOG(ERROR) << "GetRawInputDeviceInfo() failed";
	return false;
	}
	DCHECK_EQ(size, result);

	HIDP_CAPS caps;
	NTSTATUS status = hid_functions_->HidPGetCaps()(preparsed_data_, &caps);
	DCHECK_EQ(HIDP_STATUS_SUCCESS, status);

	QueryButtonCapabilities(caps.NumberInputButtonCaps);
	QueryAxisCapabilities(caps.NumberInputValueCaps);

	return true;
	}

	void RawInputGamepadDeviceWin::QueryButtonCapabilities(uint16_t button_count) {
	DCHECK(hid_functions_);
	DCHECK(hid_functions_->IsValid());
	if (button_count > 0) {
	std::unique_ptr<HIDP_BUTTON_CAPS[]> button_caps(
	new HIDP_BUTTON_CAPS[button_count]);
	NTSTATUS status = hid_functions_->HidPGetButtonCaps()(
	HidP_Input, button_caps.get(), &button_count, preparsed_data_);
	DCHECK_EQ(HIDP_STATUS_SUCCESS, status);

	// Keep track of which button indices are in use.
	std::vector<bool> button_indices_used(Gamepad::kButtonsLengthCap, false);

	// Collect all inputs from the Button usage page.
	QueryNormalButtonCapabilities(button_caps.get(), button_count,
	&button_indices_used);

	// Check for common gamepad buttons that are not on the Button usage page.
	QuerySpecialButtonCapabilities(button_caps.get(), button_count,
	&button_indices_used);
	}
	}

	void RawInputGamepadDeviceWin::QueryNormalButtonCapabilities(
	HIDP_BUTTON_CAPS button_caps[],
	uint16_t button_count,
	std::vector<bool>* button_indices_used) {
	DCHECK(button_caps);
	DCHECK(button_indices_used);

	// Collect all inputs from the Button usage page and assign button indices
	// based on the usage value.
	for (size_t i = 0; i < button_count; ++i) {
	uint16_t usage_page = button_caps[i].UsagePage;
	uint16_t usage_min = button_caps[i].Range.UsageMin;
	uint16_t usage_max = button_caps[i].Range.UsageMax;
	if (usage_min == 0 \|\| usage_max == 0)
	continue;
	size_t button_index_min = size_t{usage_min - 1};
	size_t button_index_max = size_t{usage_max - 1};
	if (usage_page == kButtonUsagePage &&
	button_index_min < Gamepad::kButtonsLengthCap) {
	button_index_max =
	std::min(Gamepad::kButtonsLengthCap - 1, button_index_max);
	buttons_length_ = std::max(buttons_length_, button_index_max + 1);
	for (size_t j = button_index_min; j <= button_index_max; ++j)
	(*button_indices_used)[j] = true;
	}
	}
	}

	void RawInputGamepadDeviceWin::QuerySpecialButtonCapabilities(
	HIDP_BUTTON_CAPS button_caps[],
	uint16_t button_count,
	std::vector<bool>* button_indices_used) {
	DCHECK(button_caps);
	DCHECK(button_indices_used);

	// Check for common gamepad buttons that are not on the Button usage page.
	std::vector<bool> has_special_usage(kSpecialUsagesLen, false);
	size_t unmapped_button_count = 0;
	for (size_t i = 0; i < button_count; ++i) {
	uint16_t usage_page = button_caps[i].UsagePage;
	uint16_t usage_min = button_caps[i].Range.UsageMin;
	uint16_t usage_max = button_caps[i].Range.UsageMax;
	for (size_t special_index = 0; special_index < kSpecialUsagesLen;
	++special_index) {
	const auto& special = kSpecialUsages[special_index];
	if (usage_page == special.usage_page && usage_min <= special.usage &&
	usage_max >= special.usage) {
	has_special_usage[special_index] = true;
	++unmapped_button_count;
	}
	}
	}

	special_button_map_.clear();
	if (unmapped_button_count > 0) {
	// Insert special buttons at unused button indices.
	special_button_map_.resize(kSpecialUsagesLen, -1);
	size_t button_index = 0;
	for (size_t special_index = 0; special_index < kSpecialUsagesLen;
	++special_index) {
	if (!has_special_usage[special_index])
	continue;

	// Advance to the next unused button index.
	while (button_index < Gamepad::kButtonsLengthCap &&
	(*button_indices_used)[button_index]) {
	++button_index;
	}
	if (button_index >= Gamepad::kButtonsLengthCap)
	break;

	special_button_map_[special_index] = button_index;
	(*button_indices_used)[button_index] = true;
	++button_index;

	if (--unmapped_button_count == 0)
	break;
	}
	}
	}

	void RawInputGamepadDeviceWin::QueryAxisCapabilities(uint16_t axis_count) {
	DCHECK(hid_functions_);
	DCHECK(hid_functions_->IsValid());
	std::unique_ptr<HIDP_VALUE_CAPS[]> axes_caps(new HIDP_VALUE_CAPS[axis_count]);
	hid_functions_->HidPGetValueCaps()(HidP_Input, axes_caps.get(), &axis_count,
	preparsed_data_);

	bool mapped_all_axes = true;

	for (size_t i = 0; i < axis_count; i++) {
	size_t axis_index = axes_caps[i].Range.UsageMin - kAxisMinimumUsageNumber;
	if (axis_index < Gamepad::kAxesLengthCap && !axes_[axis_index].active) {
	axes_[axis_index].caps = axes_caps[i];
	axes_[axis_index].value = 0;
	axes_[axis_index].active = true;
	axes_[axis_index].bitmask = GetBitmask(axes_caps[i].BitSize);
	axes_length_ = std::max(axes_length_, axis_index + 1);
	} else {
	mapped_all_axes = false;
	}
	}

	if (!mapped_all_axes) {
	// For axes whose usage puts them outside the standard axesLengthCap range.
	size_t next_index = 0;
	for (size_t i = 0; i < axis_count; i++) {
	size_t usage = axes_caps[i].Range.UsageMin - kAxisMinimumUsageNumber;
	if (usage >= Gamepad::kAxesLengthCap &&
	axes_caps[i].UsagePage <= kGameControlsUsagePage) {
	for (; next_index < Gamepad::kAxesLengthCap; ++next_index) {
	if (!axes_[next_index].active)
	break;
	}
	if (next_index < Gamepad::kAxesLengthCap) {
	axes_[next_index].caps = axes_caps[i];
	axes_[next_index].value = 0;
	axes_[next_index].active = true;
	axes_[next_index].bitmask = GetBitmask(axes_caps[i].BitSize);
	axes_length_ = std::max(axes_length_, next_index + 1);
	}
	}

	if (next_index >= Gamepad::kAxesLengthCap)
	break;
	}
	}
	}

	} // namespace device