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      1 /*
      2  * Copyright (C) 2016 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 
     18 #include <android/choreographer.h>
     19 
     20 #include <jni.h>
     21 #include <sys/time.h>
     22 #include <time.h>
     23 
     24 #include <chrono>
     25 #include <cstdlib>
     26 #include <cstring>
     27 #include <mutex>
     28 #include <thread>
     29 
     30 #define LOG_TAG "ChoreographerNative"
     31 
     32 #define ASSERT(condition, format, args...) \
     33         if (!(condition)) { \
     34             fail(env, format, ## args); \
     35             return; \
     36         }
     37 
     38 
     39 using namespace std::chrono_literals;
     40 
     41 static constexpr std::chrono::nanoseconds NOMINAL_VSYNC_PERIOD{16ms};
     42 static constexpr std::chrono::nanoseconds DELAY_PERIOD{NOMINAL_VSYNC_PERIOD * 5};
     43 
     44 static std::mutex gLock;
     45 struct Callback {
     46     int count{0};
     47     std::chrono::nanoseconds frameTime{0};
     48 };
     49 
     50 static void frameCallback(long frameTimeNanos, void* data) {
     51     std::lock_guard<std::mutex> _l(gLock);
     52     Callback* cb = static_cast<Callback*>(data);
     53     cb->count++;
     54     cb->frameTime = std::chrono::nanoseconds{frameTimeNanos};
     55 }
     56 
     57 static std::chrono::nanoseconds now() {
     58     return std::chrono::steady_clock::now().time_since_epoch();
     59 }
     60 
     61 static void fail(JNIEnv* env, const char* format, ...) {
     62     va_list args;
     63 
     64     va_start(args, format);
     65     char *msg;
     66     int rc = vasprintf(&msg, format, args);
     67     va_end(args);
     68 
     69     jclass exClass;
     70     const char *className = "java/lang/AssertionError";
     71     exClass = env->FindClass(className);
     72     env->ThrowNew(exClass, msg);
     73     free(msg);
     74 }
     75 
     76 static jlong android_view_cts_ChoreographerNativeTest_getChoreographer(JNIEnv*, jclass) {
     77     std::lock_guard<std::mutex> _l{gLock};
     78     return reinterpret_cast<jlong>(AChoreographer_getInstance());
     79 }
     80 
     81 static jboolean android_view_cts_ChoreographerNativeTest_prepareChoreographerTests(JNIEnv*, jclass,
     82         jlong choreographerPtr) {
     83     std::lock_guard<std::mutex> _l{gLock};
     84     AChoreographer* choreographer = reinterpret_cast<AChoreographer*>(choreographerPtr);
     85     return choreographer != nullptr;
     86 }
     87 
     88 static void android_view_cts_ChoreographerNativeTest_testPostCallbackWithoutDelayEventuallyRunsCallback(
     89         JNIEnv* env, jclass, jlong choreographerPtr) {
     90     AChoreographer* choreographer = reinterpret_cast<AChoreographer*>(choreographerPtr);
     91     Callback* cb1 = new Callback();
     92     Callback* cb2 = new Callback();
     93     auto start = now();
     94 
     95     AChoreographer_postFrameCallback(choreographer, frameCallback, cb1);
     96     AChoreographer_postFrameCallback(choreographer, frameCallback, cb2);
     97     std::this_thread::sleep_for(NOMINAL_VSYNC_PERIOD * 3);
     98     {
     99         std::lock_guard<std::mutex> _l{gLock};
    100         ASSERT(cb1->count == 1, "Choreographer failed to invoke callback 1");
    101         ASSERT(cb1->frameTime - start < NOMINAL_VSYNC_PERIOD * 3,
    102                 "Callback 1 has incorect frame time on first invokation");
    103         ASSERT(cb2->count == 1, "Choreographer failed to invoke callback 2");
    104         ASSERT(cb2->frameTime - start < NOMINAL_VSYNC_PERIOD * 3,
    105                 "Callback 2 has incorect frame time on first invokation");
    106         auto delta = cb2->frameTime - cb1->frameTime;
    107         ASSERT(delta == delta.zero() || delta > delta.zero() && delta < NOMINAL_VSYNC_PERIOD * 2,
    108                 "Callback 1 and 2 have frame times too large of a delta in frame times");
    109     }
    110 
    111     AChoreographer_postFrameCallback(choreographer, frameCallback, cb1);
    112     start = now();
    113     std::this_thread::sleep_for(NOMINAL_VSYNC_PERIOD * 3);
    114     {
    115         std::lock_guard<std::mutex> _l{gLock};
    116         ASSERT(cb1->count == 2, "Choreographer failed to invoke callback 1 a second time");
    117         ASSERT(cb1->frameTime - start < NOMINAL_VSYNC_PERIOD * 3,
    118                 "Callback 1 has incorect frame time on second invokation");
    119         ASSERT(cb2->count == 1, "Choreographer invoked callback 2 when not posted");
    120     }
    121 }
    122 
    123 static void android_view_cts_ChoreographerNativeTest_testPostCallbackWithDelayEventuallyRunsCallback(
    124         JNIEnv* env, jclass, jlong choreographerPtr) {
    125     AChoreographer* choreographer = reinterpret_cast<AChoreographer*>(choreographerPtr);
    126     Callback* cb1 = new Callback();
    127     auto start = now();
    128 
    129     auto delay = std::chrono::duration_cast<std::chrono::milliseconds>(DELAY_PERIOD).count();
    130     AChoreographer_postFrameCallbackDelayed(choreographer, frameCallback, cb1, delay);
    131     std::this_thread::sleep_for(NOMINAL_VSYNC_PERIOD * 3);
    132     {
    133         std::lock_guard<std::mutex> _l{gLock};
    134         ASSERT(cb1->count == 0,
    135                 "Choreographer failed to delay callback for a sufficient period of time");
    136     }
    137     std::this_thread::sleep_for(DELAY_PERIOD);
    138     {
    139         std::lock_guard<std::mutex> _l{gLock};
    140         ASSERT(cb1->count == 1, "Choreographer failed to invoke delayed callback");
    141         ASSERT(cb1->frameTime - start < DELAY_PERIOD + NOMINAL_VSYNC_PERIOD * 3,
    142                 "Frametime on callback is incorrect")
    143     }
    144 }
    145 
    146 static JNINativeMethod gMethods[] = {
    147     {  "nativeGetChoreographer", "()J",
    148             (void *) android_view_cts_ChoreographerNativeTest_getChoreographer},
    149     {  "nativePrepareChoreographerTests", "(J)Z",
    150             (void *) android_view_cts_ChoreographerNativeTest_prepareChoreographerTests},
    151     {  "nativeTestPostCallbackWithoutDelayEventuallyRunsCallbacks", "(J)V",
    152             (void *) android_view_cts_ChoreographerNativeTest_testPostCallbackWithoutDelayEventuallyRunsCallback},
    153     {  "nativeTestPostCallbackWithDelayEventuallyRunsCallbacks", "(J)V",
    154             (void *) android_view_cts_ChoreographerNativeTest_testPostCallbackWithDelayEventuallyRunsCallback},
    155 };
    156 
    157 int register_android_view_cts_ChoreographerNativeTest(JNIEnv* env)
    158 {
    159     jclass clazz = env->FindClass("android/view/cts/ChoreographerNativeTest");
    160     return env->RegisterNatives(clazz, gMethods,
    161             sizeof(gMethods) / sizeof(JNINativeMethod));
    162 }
    163