blob: 1d5220f5f8e2074d4208f76694f2bb6f86ab89fa [file] [log] [blame]
// Copyright 2014 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 "device/gamepad/gamepad_platform_data_fetcher_android.h"
#include <stddef.h>
#include "base/android/jni_android.h"
#include "base/android/jni_array.h"
#include "base/android/jni_string.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "base/trace_event/trace_event.h"
#include "jni/GamepadList_jni.h"
#include "third_party/WebKit/public/platform/WebGamepads.h"
using base::android::AttachCurrentThread;
using base::android::CheckException;
using base::android::ClearException;
using base::android::ConvertJavaStringToUTF8;
using base::android::JavaParamRef;
using base::android::ScopedJavaLocalRef;
using blink::WebGamepad;
using blink::WebGamepads;
namespace device {
bool GamepadPlatformDataFetcherAndroid::
RegisterGamepadPlatformDataFetcherAndroid(JNIEnv* env) {
return RegisterNativesImpl(env);
GamepadPlatformDataFetcherAndroid::GamepadPlatformDataFetcherAndroid() {
GamepadPlatformDataFetcherAndroid::~GamepadPlatformDataFetcherAndroid() {
GamepadSource GamepadPlatformDataFetcherAndroid::source() {
return Factory::static_source();
void GamepadPlatformDataFetcherAndroid::OnAddedToProvider() {
void GamepadPlatformDataFetcherAndroid::GetGamepadData(
bool devices_changed_hint) {
TRACE_EVENT0("GAMEPAD", "GetGamepadData");
JNIEnv* env = AttachCurrentThread();
if (!env)
Java_GamepadList_updateGamepadData(env, reinterpret_cast<intptr_t>(this));
void GamepadPlatformDataFetcherAndroid::PauseHint(bool paused) {
JNIEnv* env = AttachCurrentThread();
if (!env)
Java_GamepadList_setGamepadAPIActive(env, !paused);
static void SetGamepadData(JNIEnv* env,
const JavaParamRef<jobject>& obj,
jlong data_fetcher,
jint index,
jboolean mapping,
jboolean connected,
const JavaParamRef<jstring>& devicename,
jlong timestamp,
const JavaParamRef<jfloatArray>& jaxes,
const JavaParamRef<jfloatArray>& jbuttons) {
GamepadPlatformDataFetcherAndroid* fetcher =
DCHECK_LT(index, static_cast<int>(blink::WebGamepads::itemsLengthCap));
// Do not set gamepad parameters for all the gamepad devices that are not
// attached.
if (!connected)
PadState* state = fetcher->GetPadState(index);
if (!state)
blink::WebGamepad& pad = state->data;
// Is this the first time we've seen this device?
if (state->active_state == GAMEPAD_NEWLY_ACTIVE) {
// Map the Gamepad DeviceName String to the WebGamepad Id. Ideally it should
// be mapped to vendor and product information but it is only available at
// kernel level and it can not be queried using class
// android.hardware.input.InputManager.
base::string16 device_name;
base::android::ConvertJavaStringToUTF16(env, devicename, &device_name);
const size_t name_to_copy =
std::min(device_name.size(), WebGamepad::idLengthCap - 1);
name_to_copy * sizeof(base::string16::value_type));[name_to_copy] = 0;
base::string16 mapping_name = base::UTF8ToUTF16(mapping ? "standard" : "");
const size_t mapping_to_copy =
std::min(mapping_name.size(), WebGamepad::mappingLengthCap - 1);
mapping_to_copy * sizeof(base::string16::value_type));
pad.mapping[mapping_to_copy] = 0;
pad.timestamp = timestamp;
std::vector<float> axes;
base::android::JavaFloatArrayToFloatVector(env, jaxes, &axes);
// Set WebGamepad axeslength to total number of axes on the gamepad device.
// Only return the first axesLengthCap if axeslength captured by GamepadList
// is larger than axesLengthCap.
pad.axesLength = std::min(static_cast<int>(axes.size()),
// Copy axes state to the WebGamepad axes[].
for (unsigned int i = 0; i < pad.axesLength; i++) {
pad.axes[i] = static_cast<double>(axes[i]);
std::vector<float> buttons;
base::android::JavaFloatArrayToFloatVector(env, jbuttons, &buttons);
// Set WebGamepad buttonslength to total number of axes on the gamepad
// device. Only return the first buttonsLengthCap if axeslength captured by
// GamepadList is larger than buttonsLengthCap.
pad.buttonsLength = std::min(static_cast<int>(buttons.size()),
// Copy buttons state to the WebGamepad buttons[].
for (unsigned int j = 0; j < pad.buttonsLength; j++) {
pad.buttons[j].pressed = buttons[j];
pad.buttons[j].value = buttons[j];
} // namespace device