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      1 /*
      2  * Copyright (C) 2011 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 "DisplayEventReceiver"
     18 
     19 //#define LOG_NDEBUG 0
     20 
     21 #include <nativehelper/JNIHelp.h>
     22 
     23 #include <inttypes.h>
     24 
     25 #include <android_runtime/AndroidRuntime.h>
     26 #include <androidfw/DisplayEventDispatcher.h>
     27 #include <utils/Log.h>
     28 #include <utils/Looper.h>
     29 #include <utils/threads.h>
     30 #include <gui/DisplayEventReceiver.h>
     31 #include "android_os_MessageQueue.h"
     32 
     33 #include <nativehelper/ScopedLocalRef.h>
     34 
     35 #include "core_jni_helpers.h"
     36 
     37 namespace android {
     38 
     39 static struct {
     40     jclass clazz;
     41 
     42     jmethodID dispatchVsync;
     43     jmethodID dispatchHotplug;
     44 } gDisplayEventReceiverClassInfo;
     45 
     46 
     47 class NativeDisplayEventReceiver : public DisplayEventDispatcher {
     48 public:
     49     NativeDisplayEventReceiver(JNIEnv* env,
     50             jobject receiverWeak, const sp<MessageQueue>& messageQueue, jint vsyncSource);
     51 
     52     void dispose();
     53 
     54 protected:
     55     virtual ~NativeDisplayEventReceiver();
     56 
     57 private:
     58     jobject mReceiverWeakGlobal;
     59     sp<MessageQueue> mMessageQueue;
     60     DisplayEventReceiver mReceiver;
     61 
     62     virtual void dispatchVsync(nsecs_t timestamp, int32_t id, uint32_t count);
     63     virtual void dispatchHotplug(nsecs_t timestamp, int32_t id, bool connected);
     64 };
     65 
     66 
     67 NativeDisplayEventReceiver::NativeDisplayEventReceiver(JNIEnv* env,
     68         jobject receiverWeak, const sp<MessageQueue>& messageQueue, jint vsyncSource) :
     69         DisplayEventDispatcher(messageQueue->getLooper(),
     70                 static_cast<ISurfaceComposer::VsyncSource>(vsyncSource)),
     71         mReceiverWeakGlobal(env->NewGlobalRef(receiverWeak)),
     72         mMessageQueue(messageQueue) {
     73     ALOGV("receiver %p ~ Initializing display event receiver.", this);
     74 }
     75 
     76 NativeDisplayEventReceiver::~NativeDisplayEventReceiver() {
     77     JNIEnv* env = AndroidRuntime::getJNIEnv();
     78     env->DeleteGlobalRef(mReceiverWeakGlobal);
     79     ALOGV("receiver %p ~ dtor display event receiver.", this);
     80 }
     81 
     82 void NativeDisplayEventReceiver::dispose() {
     83     ALOGV("receiver %p ~ Disposing display event receiver.", this);
     84     DisplayEventDispatcher::dispose();
     85 }
     86 
     87 void NativeDisplayEventReceiver::dispatchVsync(nsecs_t timestamp, int32_t id, uint32_t count) {
     88     JNIEnv* env = AndroidRuntime::getJNIEnv();
     89 
     90     ScopedLocalRef<jobject> receiverObj(env, jniGetReferent(env, mReceiverWeakGlobal));
     91     if (receiverObj.get()) {
     92         ALOGV("receiver %p ~ Invoking vsync handler.", this);
     93         env->CallVoidMethod(receiverObj.get(),
     94                 gDisplayEventReceiverClassInfo.dispatchVsync, timestamp, id, count);
     95         ALOGV("receiver %p ~ Returned from vsync handler.", this);
     96     }
     97 
     98     mMessageQueue->raiseAndClearException(env, "dispatchVsync");
     99 }
    100 
    101 void NativeDisplayEventReceiver::dispatchHotplug(nsecs_t timestamp, int32_t id, bool connected) {
    102     JNIEnv* env = AndroidRuntime::getJNIEnv();
    103 
    104     ScopedLocalRef<jobject> receiverObj(env, jniGetReferent(env, mReceiverWeakGlobal));
    105     if (receiverObj.get()) {
    106         ALOGV("receiver %p ~ Invoking hotplug handler.", this);
    107         env->CallVoidMethod(receiverObj.get(),
    108                 gDisplayEventReceiverClassInfo.dispatchHotplug, timestamp, id, connected);
    109         ALOGV("receiver %p ~ Returned from hotplug handler.", this);
    110     }
    111 
    112     mMessageQueue->raiseAndClearException(env, "dispatchHotplug");
    113 }
    114 
    115 
    116 static jlong nativeInit(JNIEnv* env, jclass clazz, jobject receiverWeak,
    117         jobject messageQueueObj, jint vsyncSource) {
    118     sp<MessageQueue> messageQueue = android_os_MessageQueue_getMessageQueue(env, messageQueueObj);
    119     if (messageQueue == NULL) {
    120         jniThrowRuntimeException(env, "MessageQueue is not initialized.");
    121         return 0;
    122     }
    123 
    124     sp<NativeDisplayEventReceiver> receiver = new NativeDisplayEventReceiver(env,
    125             receiverWeak, messageQueue, vsyncSource);
    126     status_t status = receiver->initialize();
    127     if (status) {
    128         String8 message;
    129         message.appendFormat("Failed to initialize display event receiver.  status=%d", status);
    130         jniThrowRuntimeException(env, message.string());
    131         return 0;
    132     }
    133 
    134     receiver->incStrong(gDisplayEventReceiverClassInfo.clazz); // retain a reference for the object
    135     return reinterpret_cast<jlong>(receiver.get());
    136 }
    137 
    138 static void nativeDispose(JNIEnv* env, jclass clazz, jlong receiverPtr) {
    139     NativeDisplayEventReceiver* receiver =
    140             reinterpret_cast<NativeDisplayEventReceiver*>(receiverPtr);
    141     receiver->dispose();
    142     receiver->decStrong(gDisplayEventReceiverClassInfo.clazz); // drop reference held by the object
    143 }
    144 
    145 static void nativeScheduleVsync(JNIEnv* env, jclass clazz, jlong receiverPtr) {
    146     sp<NativeDisplayEventReceiver> receiver =
    147             reinterpret_cast<NativeDisplayEventReceiver*>(receiverPtr);
    148     status_t status = receiver->scheduleVsync();
    149     if (status) {
    150         String8 message;
    151         message.appendFormat("Failed to schedule next vertical sync pulse.  status=%d", status);
    152         jniThrowRuntimeException(env, message.string());
    153     }
    154 }
    155 
    156 
    157 static const JNINativeMethod gMethods[] = {
    158     /* name, signature, funcPtr */
    159     { "nativeInit",
    160             "(Ljava/lang/ref/WeakReference;Landroid/os/MessageQueue;I)J",
    161             (void*)nativeInit },
    162     { "nativeDispose",
    163             "(J)V",
    164             (void*)nativeDispose },
    165     // @FastNative
    166     { "nativeScheduleVsync", "(J)V",
    167             (void*)nativeScheduleVsync }
    168 };
    169 
    170 int register_android_view_DisplayEventReceiver(JNIEnv* env) {
    171     int res = RegisterMethodsOrDie(env, "android/view/DisplayEventReceiver", gMethods,
    172                                    NELEM(gMethods));
    173 
    174     jclass clazz = FindClassOrDie(env, "android/view/DisplayEventReceiver");
    175     gDisplayEventReceiverClassInfo.clazz = MakeGlobalRefOrDie(env, clazz);
    176 
    177     gDisplayEventReceiverClassInfo.dispatchVsync = GetMethodIDOrDie(env,
    178             gDisplayEventReceiverClassInfo.clazz, "dispatchVsync", "(JII)V");
    179     gDisplayEventReceiverClassInfo.dispatchHotplug = GetMethodIDOrDie(env,
    180             gDisplayEventReceiverClassInfo.clazz, "dispatchHotplug", "(JIZ)V");
    181 
    182     return res;
    183 }
    184 
    185 } // namespace android
    186