1 files changed, 282 insertions, 0 deletions
diff --git a/core/jni/android_view_InputQueue.cpp b/core/jni/android_view_InputQueue.cpp
new file mode 100644
index 0000000..ec56afa
--- /dev/null
+++ b/core/jni/android_view_InputQueue.cpp
@@ -0,0 +1,282 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "InputQueue"
+
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <android/input.h>
+#include <android_runtime/AndroidRuntime.h>
+#include <android_runtime/android_view_InputQueue.h>
+#include <androidfw/Input.h>
+#include <utils/Looper.h>
+#include <utils/TypeHelpers.h>
+#include <ScopedLocalRef.h>
+
+#include "JNIHelp.h"
+#include "android_os_MessageQueue.h"
+#include "android_view_KeyEvent.h"
+#include "android_view_MotionEvent.h"
+
+namespace android {
+
+static struct {
+    jmethodID finishInputEvent;
+} gInputQueueClassInfo;
+
+enum {
+    MSG_FINISH_INPUT = 1,
+};
+
+InputQueue::InputQueue(jobject inputQueueObj, const sp<Looper>& looper,
+        int dispatchReadFd, int dispatchWriteFd) :
+        mDispatchReadFd(dispatchReadFd), mDispatchWriteFd(dispatchWriteFd),
+        mDispatchLooper(looper), mHandler(new WeakMessageHandler(this)) {
+    JNIEnv* env = AndroidRuntime::getJNIEnv();
+    mInputQueueWeakGlobal = env->NewGlobalRef(inputQueueObj);
+}
+
+InputQueue::~InputQueue() {
+    mDispatchLooper->removeMessages(mHandler);
+    JNIEnv* env = AndroidRuntime::getJNIEnv();
+    env->DeleteGlobalRef(mInputQueueWeakGlobal);
+    close(mDispatchReadFd);
+    close(mDispatchWriteFd);
+}
+
+void InputQueue::attachLooper(Looper* looper, int ident,
+        ALooper_callbackFunc callback, void* data) {
+    Mutex::Autolock _l(mLock);
+    for (size_t i = 0; i < mAppLoopers.size(); i++) {
+        if (looper == mAppLoopers[i]) {
+            return;
+        }
+    }
+    mAppLoopers.push(looper);
+    looper->addFd(mDispatchReadFd, ident, ALOOPER_EVENT_INPUT, callback, data);
+}
+
+void InputQueue::detachLooper() {
+    Mutex::Autolock _l(mLock);
+    detachLooperLocked();
+}
+
+void InputQueue::detachLooperLocked() {
+    for (size_t i = 0; i < mAppLoopers.size(); i++) {
+        mAppLoopers[i]->removeFd(mDispatchReadFd);
+    }
+    mAppLoopers.clear();
+}
+
+bool InputQueue::hasEvents() {
+    Mutex::Autolock _l(mLock);
+    return mPendingEvents.size() > 0;
+}
+
+status_t InputQueue::getEvent(InputEvent** outEvent) {
+    Mutex::Autolock _l(mLock);
+    *outEvent = NULL;
+    if (!mPendingEvents.isEmpty()) {
+        *outEvent = mPendingEvents[0];
+        mPendingEvents.removeAt(0);
+    }
+
+    if (mPendingEvents.isEmpty()) {
+        char byteread[16];
+        ssize_t nRead;
+        do {
+            nRead = TEMP_FAILURE_RETRY(read(mDispatchReadFd, &byteread, sizeof(byteread)));
+            if (nRead < 0 && errno != EAGAIN) {
+                ALOGW("Failed to read from native dispatch pipe: %s", strerror(errno));
+            }
+        } while (nRead > 0);
+    }
+
+    return *outEvent != NULL ? OK : WOULD_BLOCK;
+}
+
+bool InputQueue::preDispatchEvent(InputEvent* e) {
+    if (e->getType() == AINPUT_EVENT_TYPE_KEY) {
+        KeyEvent* keyEvent = static_cast<KeyEvent*>(e);
+        if (keyEvent->getFlags() & AKEY_EVENT_FLAG_PREDISPATCH) {
+            finishEvent(e, false);
+            return true;
+        }
+    }
+    return false;
+}
+
+void InputQueue::finishEvent(InputEvent* event, bool handled) {
+    Mutex::Autolock _l(mLock);
+    mFinishedEvents.push(key_value_pair_t<InputEvent*, bool>(event, handled));
+    if (mFinishedEvents.size() == 1) {
+        mDispatchLooper->sendMessage(this, Message(MSG_FINISH_INPUT));
+    }
+}
+
+void InputQueue::handleMessage(const Message& message) {
+    switch(message.what) {
+    case MSG_FINISH_INPUT:
+        JNIEnv* env = AndroidRuntime::getJNIEnv();
+        ScopedLocalRef<jobject> inputQueueObj(env, jniGetReferent(env, mInputQueueWeakGlobal));
+        if (!inputQueueObj.get()) {
+            ALOGW("InputQueue was finalized without being disposed");
+            return;
+        }
+        while (true) {
+            InputEvent* event;
+            bool handled;
+            {
+                Mutex::Autolock _l(mLock);
+                if (mFinishedEvents.isEmpty()) {
+                    break;
+                }
+                event = mFinishedEvents[0].getKey();
+                handled = mFinishedEvents[0].getValue();
+                mFinishedEvents.removeAt(0);
+            }
+            env->CallVoidMethod(inputQueueObj.get(), gInputQueueClassInfo.finishInputEvent,
+                    reinterpret_cast<jint>(event), handled);
+            recycleInputEvent(event);
+        }
+        break;
+    }
+}
+
+void InputQueue::recycleInputEvent(InputEvent* event) {
+    mPooledInputEventFactory.recycle(event);
+}
+
+KeyEvent* InputQueue::createKeyEvent() {
+    return mPooledInputEventFactory.createKeyEvent();
+}
+
+MotionEvent* InputQueue::createMotionEvent() {
+    return mPooledInputEventFactory.createMotionEvent();
+}
+
+void InputQueue::enqueueEvent(InputEvent* event) {
+    Mutex::Autolock _l(mLock);
+    mPendingEvents.push(event);
+    if (mPendingEvents.size() == 1) {
+        char dummy = 0;
+        int res = TEMP_FAILURE_RETRY(write(mDispatchWriteFd, &dummy, sizeof(dummy)));
+        if (res < 0 && errno != EAGAIN) {
+            ALOGW("Failed writing to dispatch fd: %s", strerror(errno));
+        }
+    }
+}
+
+InputQueue* InputQueue::createQueue(jobject inputQueueObj, const sp<Looper>& looper) {
+    int pipeFds[2];
+    if (pipe(pipeFds)) {
+        ALOGW("Could not create native input dispatching pipe: %s", strerror(errno));
+        return NULL;
+    }
+    fcntl(pipeFds[0], F_SETFL, O_NONBLOCK);
+    fcntl(pipeFds[1], F_SETFL, O_NONBLOCK);
+    return new InputQueue(inputQueueObj, looper, pipeFds[0], pipeFds[1]);
+}
+
+static jint nativeInit(JNIEnv* env, jobject clazz, jobject queueWeak, jobject jMsgQueue) {
+    sp<MessageQueue> messageQueue = android_os_MessageQueue_getMessageQueue(env, jMsgQueue);
+    if (messageQueue == NULL) {
+        jniThrowRuntimeException(env, "MessageQueue is not initialized.");
+        return 0;
+    }
+    sp<InputQueue> queue = InputQueue::createQueue(queueWeak, messageQueue->getLooper());
+    if (!queue.get()) {
+        jniThrowRuntimeException(env, "InputQueue failed to initialize");
+        return 0;
+    }
+    queue->incStrong(&gInputQueueClassInfo);
+    return reinterpret_cast<jint>(queue.get());
+}
+
+static void nativeDispose(JNIEnv* env, jobject clazz, jint ptr) {
+    sp<InputQueue> queue = reinterpret_cast<InputQueue*>(ptr);
+    queue->detachLooper();
+    queue->decStrong(&gInputQueueClassInfo);
+}
+
+static jint nativeSendKeyEvent(JNIEnv* env, jobject clazz, jint ptr, jobject eventObj,
+        jboolean predispatch) {
+    InputQueue* queue = reinterpret_cast<InputQueue*>(ptr);
+    KeyEvent* event = queue->createKeyEvent();
+    status_t status = android_view_KeyEvent_toNative(env, eventObj, event);
+    if (status) {
+        queue->recycleInputEvent(event);
+        jniThrowRuntimeException(env, "Could not read contents of KeyEvent object.");
+        return -1;
+    }
+
+    if (predispatch) {
+        event->setFlags(event->getFlags() | AKEY_EVENT_FLAG_PREDISPATCH);
+    }
+
+    queue->enqueueEvent(event);
+    return reinterpret_cast<jint>(event);
+}
+
+static jint nativeSendMotionEvent(JNIEnv* env, jobject clazz, jint ptr, jobject eventObj) {
+    sp<InputQueue> queue = reinterpret_cast<InputQueue*>(ptr);
+    MotionEvent* originalEvent = android_view_MotionEvent_getNativePtr(env, eventObj);
+    if (!originalEvent) {
+        jniThrowRuntimeException(env, "Could not obtain MotionEvent pointer.");
+        return -1;
+    }
+    MotionEvent* event = queue->createMotionEvent();
+    event->copyFrom(originalEvent, true /* keepHistory */);
+    queue->enqueueEvent(event);
+    return reinterpret_cast<jint>(event);
+}
+
+static const JNINativeMethod g_methods[] = {
+    { "nativeInit", "(Ljava/lang/ref/WeakReference;Landroid/os/MessageQueue;)I",
+        (void*) nativeInit },
+    { "nativeDispose", "(I)V", (void*) nativeDispose },
+    { "nativeSendKeyEvent", "(ILandroid/view/KeyEvent;Z)I", (void*) nativeSendKeyEvent },
+    { "nativeSendMotionEvent", "(ILandroid/view/MotionEvent;)I", (void*) nativeSendMotionEvent },
+};
+
+static const char* const kInputQueuePathName = "android/view/InputQueue";
+
+#define FIND_CLASS(var, className) \
+        do { \
+        var = env->FindClass(className); \
+        LOG_FATAL_IF(! var, "Unable to find class %s", className); \
+        } while(0)
+
+#define GET_METHOD_ID(var, clazz, methodName, fieldDescriptor) \
+        do { \
+        var = env->GetMethodID(clazz, methodName, fieldDescriptor); \
+        LOG_FATAL_IF(! var, "Unable to find method" methodName); \
+        } while(0)
+
+int register_android_view_InputQueue(JNIEnv* env)
+{
+    jclass clazz;
+    FIND_CLASS(clazz, kInputQueuePathName);
+    GET_METHOD_ID(gInputQueueClassInfo.finishInputEvent, clazz, "finishInputEvent", "(IZ)V");
+
+    return AndroidRuntime::registerNativeMethods(
+        env, kInputQueuePathName,
+        g_methods, NELEM(g_methods));
+}
+
+} // namespace android