1 /*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define LOG_TAG "InputQueue"
18
19 #include <fcntl.h>
20 #include <string.h>
21 #include <unistd.h>
22
23 #include <android/input.h>
24 #include <android_runtime/AndroidRuntime.h>
25 #include <android_runtime/android_view_InputQueue.h>
26 #include <input/Input.h>
27 #include <utils/Looper.h>
28 #include <utils/TypeHelpers.h>
29 #include <nativehelper/ScopedLocalRef.h>
30
31 #include <nativehelper/JNIHelp.h>
32 #include "android_os_MessageQueue.h"
33 #include "android_view_KeyEvent.h"
34 #include "android_view_MotionEvent.h"
35
36 #include "core_jni_helpers.h"
37
38 namespace android {
39
40 static struct {
41 jmethodID finishInputEvent;
42 jmethodID getNativePtr;
43 } gInputQueueClassInfo;
44
45 enum {
46 MSG_FINISH_INPUT = 1,
47 };
48
InputQueue(jobject inputQueueObj,const sp<Looper> & looper,int dispatchReadFd,int dispatchWriteFd)49 InputQueue::InputQueue(jobject inputQueueObj, const sp<Looper>& looper,
50 int dispatchReadFd, int dispatchWriteFd) :
51 mDispatchReadFd(dispatchReadFd), mDispatchWriteFd(dispatchWriteFd),
52 mDispatchLooper(looper), mHandler(new WeakMessageHandler(this)) {
53 JNIEnv* env = AndroidRuntime::getJNIEnv();
54 mInputQueueWeakGlobal = env->NewGlobalRef(inputQueueObj);
55 }
56
~InputQueue()57 InputQueue::~InputQueue() {
58 mDispatchLooper->removeMessages(mHandler);
59 JNIEnv* env = AndroidRuntime::getJNIEnv();
60 env->DeleteGlobalRef(mInputQueueWeakGlobal);
61 close(mDispatchReadFd);
62 close(mDispatchWriteFd);
63 }
64
attachLooper(Looper * looper,int ident,ALooper_callbackFunc callback,void * data)65 void InputQueue::attachLooper(Looper* looper, int ident,
66 ALooper_callbackFunc callback, void* data) {
67 Mutex::Autolock _l(mLock);
68 for (size_t i = 0; i < mAppLoopers.size(); i++) {
69 if (looper == mAppLoopers[i]) {
70 return;
71 }
72 }
73 mAppLoopers.push(looper);
74 looper->addFd(mDispatchReadFd, ident, ALOOPER_EVENT_INPUT, callback, data);
75 }
76
detachLooper()77 void InputQueue::detachLooper() {
78 Mutex::Autolock _l(mLock);
79 detachLooperLocked();
80 }
81
detachLooperLocked()82 void InputQueue::detachLooperLocked() {
83 for (size_t i = 0; i < mAppLoopers.size(); i++) {
84 mAppLoopers[i]->removeFd(mDispatchReadFd);
85 }
86 mAppLoopers.clear();
87 }
88
hasEvents()89 bool InputQueue::hasEvents() {
90 Mutex::Autolock _l(mLock);
91 return mPendingEvents.size() > 0;
92 }
93
getEvent(InputEvent ** outEvent)94 status_t InputQueue::getEvent(InputEvent** outEvent) {
95 Mutex::Autolock _l(mLock);
96 *outEvent = NULL;
97 if (!mPendingEvents.isEmpty()) {
98 *outEvent = mPendingEvents[0];
99 mPendingEvents.removeAt(0);
100 }
101
102 if (mPendingEvents.isEmpty()) {
103 char byteread[16];
104 ssize_t nRead;
105 do {
106 nRead = TEMP_FAILURE_RETRY(read(mDispatchReadFd, &byteread, sizeof(byteread)));
107 if (nRead < 0 && errno != EAGAIN) {
108 ALOGW("Failed to read from native dispatch pipe: %s", strerror(errno));
109 }
110 } while (nRead > 0);
111 }
112
113 return *outEvent != NULL ? OK : WOULD_BLOCK;
114 }
115
preDispatchEvent(InputEvent * e)116 bool InputQueue::preDispatchEvent(InputEvent* e) {
117 if (e->getType() == InputEventType::KEY) {
118 KeyEvent* keyEvent = static_cast<KeyEvent*>(e);
119 if (keyEvent->getFlags() & AKEY_EVENT_FLAG_PREDISPATCH) {
120 finishEvent(e, false);
121 return true;
122 }
123 }
124 return false;
125 }
126
finishEvent(InputEvent * event,bool handled)127 void InputQueue::finishEvent(InputEvent* event, bool handled) {
128 Mutex::Autolock _l(mLock);
129 mFinishedEvents.push(key_value_pair_t<InputEvent*, bool>(event, handled));
130 if (mFinishedEvents.size() == 1) {
131 mDispatchLooper->sendMessage(this, Message(MSG_FINISH_INPUT));
132 }
133 }
134
handleMessage(const Message & message)135 void InputQueue::handleMessage(const Message& message) {
136 switch(message.what) {
137 case MSG_FINISH_INPUT:
138 JNIEnv* env = AndroidRuntime::getJNIEnv();
139 ScopedLocalRef<jobject> inputQueueObj(env, GetReferent(env, mInputQueueWeakGlobal));
140 if (!inputQueueObj.get()) {
141 ALOGW("InputQueue was finalized without being disposed");
142 return;
143 }
144 while (true) {
145 InputEvent* event;
146 bool handled;
147 {
148 Mutex::Autolock _l(mLock);
149 if (mFinishedEvents.isEmpty()) {
150 break;
151 }
152 event = mFinishedEvents[0].getKey();
153 handled = mFinishedEvents[0].getValue();
154 mFinishedEvents.removeAt(0);
155 }
156 env->CallVoidMethod(inputQueueObj.get(), gInputQueueClassInfo.finishInputEvent,
157 reinterpret_cast<jlong>(event), handled);
158 recycleInputEvent(event);
159 }
160 break;
161 }
162 }
163
recycleInputEvent(InputEvent * event)164 void InputQueue::recycleInputEvent(InputEvent* event) {
165 mPooledInputEventFactory.recycle(event);
166 }
167
createKeyEvent()168 KeyEvent* InputQueue::createKeyEvent() {
169 return mPooledInputEventFactory.createKeyEvent();
170 }
171
createMotionEvent()172 MotionEvent* InputQueue::createMotionEvent() {
173 return mPooledInputEventFactory.createMotionEvent();
174 }
175
enqueueEvent(InputEvent * event)176 void InputQueue::enqueueEvent(InputEvent* event) {
177 Mutex::Autolock _l(mLock);
178 mPendingEvents.push(event);
179 if (mPendingEvents.size() == 1) {
180 char payload = '\0';
181 int res = TEMP_FAILURE_RETRY(write(mDispatchWriteFd, &payload, sizeof(payload)));
182 if (res < 0 && errno != EAGAIN) {
183 ALOGW("Failed writing to dispatch fd: %s", strerror(errno));
184 }
185 }
186 }
187
createQueue(jobject inputQueueObj,const sp<Looper> & looper)188 InputQueue* InputQueue::createQueue(jobject inputQueueObj, const sp<Looper>& looper) {
189 int pipeFds[2];
190 if (pipe(pipeFds)) {
191 ALOGW("Could not create native input dispatching pipe: %s", strerror(errno));
192 return NULL;
193 }
194 fcntl(pipeFds[0], F_SETFL, O_NONBLOCK);
195 fcntl(pipeFds[1], F_SETFL, O_NONBLOCK);
196 return new InputQueue(inputQueueObj, looper, pipeFds[0], pipeFds[1]);
197 }
198
nativeInit(JNIEnv * env,jobject clazz,jobject queueWeak,jobject jMsgQueue)199 static jlong nativeInit(JNIEnv* env, jobject clazz, jobject queueWeak, jobject jMsgQueue) {
200 sp<MessageQueue> messageQueue = android_os_MessageQueue_getMessageQueue(env, jMsgQueue);
201 if (messageQueue == NULL) {
202 jniThrowRuntimeException(env, "MessageQueue is not initialized.");
203 return 0;
204 }
205 sp<InputQueue> queue = InputQueue::createQueue(queueWeak, messageQueue->getLooper());
206 if (!queue.get()) {
207 jniThrowRuntimeException(env, "InputQueue failed to initialize");
208 return 0;
209 }
210 queue->incStrong(&gInputQueueClassInfo);
211 return reinterpret_cast<jlong>(queue.get());
212 }
213
nativeDispose(JNIEnv * env,jobject clazz,jlong ptr)214 static void nativeDispose(JNIEnv* env, jobject clazz, jlong ptr) {
215 sp<InputQueue> queue = reinterpret_cast<InputQueue*>(ptr);
216 queue->detachLooper();
217 queue->decStrong(&gInputQueueClassInfo);
218 }
219
nativeSendKeyEvent(JNIEnv * env,jobject clazz,jlong ptr,jobject eventObj,jboolean predispatch)220 static jlong nativeSendKeyEvent(JNIEnv* env, jobject clazz, jlong ptr, jobject eventObj,
221 jboolean predispatch) {
222 InputQueue* queue = reinterpret_cast<InputQueue*>(ptr);
223 KeyEvent* event = queue->createKeyEvent();
224 *event = android_view_KeyEvent_obtainAsCopy(env, eventObj);
225
226 if (predispatch) {
227 event->setFlags(event->getFlags() | AKEY_EVENT_FLAG_PREDISPATCH);
228 }
229
230 queue->enqueueEvent(event);
231 return reinterpret_cast<jlong>(event);
232 }
233
nativeSendMotionEvent(JNIEnv * env,jobject clazz,jlong ptr,jobject eventObj)234 static jlong nativeSendMotionEvent(JNIEnv* env, jobject clazz, jlong ptr, jobject eventObj) {
235 sp<InputQueue> queue = reinterpret_cast<InputQueue*>(ptr);
236 MotionEvent* originalEvent = android_view_MotionEvent_getNativePtr(env, eventObj);
237 if (!originalEvent) {
238 jniThrowRuntimeException(env, "Could not obtain MotionEvent pointer.");
239 return -1;
240 }
241 MotionEvent* event = queue->createMotionEvent();
242 event->copyFrom(originalEvent, /*keepHistory=*/true);
243 queue->enqueueEvent(event);
244 return reinterpret_cast<jlong>(event);
245 }
246
247 static const JNINativeMethod g_methods[] = {
248 { "nativeInit", "(Ljava/lang/ref/WeakReference;Landroid/os/MessageQueue;)J",
249 (void*) nativeInit },
250 { "nativeDispose", "(J)V", (void*) nativeDispose },
251 { "nativeSendKeyEvent", "(JLandroid/view/KeyEvent;Z)J", (void*) nativeSendKeyEvent },
252 { "nativeSendMotionEvent", "(JLandroid/view/MotionEvent;)J", (void*) nativeSendMotionEvent },
253 };
254
255 static const char* const kInputQueuePathName = "android/view/InputQueue";
256
register_android_view_InputQueue(JNIEnv * env)257 int register_android_view_InputQueue(JNIEnv* env)
258 {
259 jclass clazz = FindClassOrDie(env, kInputQueuePathName);
260 gInputQueueClassInfo.finishInputEvent = GetMethodIDOrDie(env, clazz, "finishInputEvent",
261 "(JZ)V");
262 gInputQueueClassInfo.getNativePtr = GetMethodIDOrDie(env, clazz, "getNativePtr", "()J");
263
264 return RegisterMethodsOrDie(env, kInputQueuePathName, g_methods, NELEM(g_methods));
265 }
266
android_view_InputQueue_getNativePtr(JNIEnv * env,jobject inputQueue)267 AInputQueue* android_view_InputQueue_getNativePtr(JNIEnv* env, jobject inputQueue) {
268 jlong ptr = env->CallLongMethod(inputQueue, gInputQueueClassInfo.getNativePtr);
269 return reinterpret_cast<AInputQueue*>(ptr);
270 }
271
272 } // namespace android
273