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Unified Diff: content/browser/gamepad/gamepad_platform_data_fetcher_android.cc

Issue 133943002: Gamepad API support for chrome on android (Closed) Base URL: http://git.chromium.org/chromium/src.git@master
Patch Set: Created 6 years, 7 months ago
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Index: content/browser/gamepad/gamepad_platform_data_fetcher_android.cc
diff --git a/content/browser/gamepad/gamepad_platform_data_fetcher_android.cc b/content/browser/gamepad/gamepad_platform_data_fetcher_android.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a8673fa32524e92561ceedadd4bf5eaa6dbd6e17
--- /dev/null
+++ b/content/browser/gamepad/gamepad_platform_data_fetcher_android.cc
@@ -0,0 +1,149 @@
+// 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 "content/browser/gamepad/gamepad_platform_data_fetcher_android.h"
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_array.h"
+#include "base/android/jni_string.h"
+#include "base/debug/trace_event.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_util.h"
+#include "base/strings/utf_string_conversions.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::ScopedJavaLocalRef;
+using blink::WebGamepad;
+using blink::WebGamepads;
+
+namespace content {
+
+bool
+GamepadPlatformDataFetcherAndroid::RegisterGamepadPlatformDataFetcherAndroid(
+ JNIEnv* env) {
+ return RegisterNativesImpl(env);
+}
+
+GamepadPlatformDataFetcherAndroid::GamepadPlatformDataFetcherAndroid() {
+ PauseHint(false);
+}
+
+GamepadPlatformDataFetcherAndroid::~GamepadPlatformDataFetcherAndroid() {
+ PauseHint(true);
+}
+
+void GamepadPlatformDataFetcherAndroid::GetGamepadData(
+ blink::WebGamepads* pads,
+ bool devices_changed_hint) {
+ TRACE_EVENT0("GAMEPAD", "GetGamepadData");
+
+ pads->length = 0;
+
+ JNIEnv* env = AttachCurrentThread();
+ if (!env)
+ return;
+
+ Java_GamepadList_updateGamepadData(env, reinterpret_cast<intptr_t>(pads));
+}
+
+void GamepadPlatformDataFetcherAndroid::PauseHint(bool paused) {
+ JNIEnv* env = AttachCurrentThread();
+ if (!env)
+ return;
+
+ Java_GamepadList_notifyForGamepadsAccess(env, paused);
+}
+
+static void SetGamepadData(JNIEnv* env,
+ jobject obj,
+ jlong gamepads,
+ jint index,
+ jboolean mapping,
+ jboolean connected,
+ jstring devicename,
+ jlong timestamp,
+ jfloatArray jaxes,
+ jfloatArray jbuttons) {
+ DCHECK(gamepads);
+ blink::WebGamepads* pads = reinterpret_cast<WebGamepads*>(gamepads);
+ DCHECK_EQ(pads->length, unsigned(index));
+ DCHECK_LT(index, static_cast<int>(blink::WebGamepads::itemsLengthCap));
+
+ ++pads->length;
+
+ blink::WebGamepad& pad = pads->items[index];
+
+ pad.connected = connected;
+
+ pad.timestamp = timestamp;
+
+ // Do not set gamepad parameters for all the gamepad devices that are not
+ // attached.
+ if (!connected)
+ return;
+
+ // 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.
+ // TODO(SaurabhK): Store a cached WebGamePad object in
+ // GamepadPlatformDataFetcherAndroid and only update constant WebGamepad
+ // values when a device has changed.
+ 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);
+ memcpy(pad.id,
+ device_name.data(),
+ name_to_copy * sizeof(base::string16::value_type));
+ pad.id[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);
+ memcpy(pad.mapping,
+ mapping_name.data(),
+ 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()),
+ static_cast<int>(WebGamepad::axesLengthCap));
+
+ // 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()),
+ static_cast<int>(WebGamepad::buttonsLengthCap));
+
+ // 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 content

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