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/*
* Copyright (C) 2019 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.
*/
#include "android_graphics_HardwareRendererObserver.h"
#include "graphics_jni_helpers.h"
#include "nativehelper/jni_macros.h"
#include <array>
namespace android {
struct {
jmethodID callback;
} gHardwareRendererObserverClassInfo;
static JNIEnv* getenv(JavaVM* vm) {
JNIEnv* env;
if (vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6) != JNI_OK) {
LOG_ALWAYS_FATAL("Failed to get JNIEnv for JavaVM: %p", vm);
}
return env;
}
HardwareRendererObserver::HardwareRendererObserver(JavaVM *vm, jobject observer) : mVm(vm) {
mObserverWeak = getenv(mVm)->NewWeakGlobalRef(observer);
LOG_ALWAYS_FATAL_IF(mObserverWeak == nullptr,
"unable to create frame stats observer reference");
}
HardwareRendererObserver::~HardwareRendererObserver() {
JNIEnv* env = getenv(mVm);
env->DeleteWeakGlobalRef(mObserverWeak);
}
bool HardwareRendererObserver::getNextBuffer(JNIEnv* env, jlongArray metrics, int* dropCount) {
jsize bufferSize = env->GetArrayLength(reinterpret_cast<jarray>(metrics));
LOG_ALWAYS_FATAL_IF(bufferSize != HardwareRendererObserver::kBufferSize,
"Mismatched Java/Native FrameMetrics data format.");
FrameMetricsNotification& elem = mRingBuffer[mNextInQueue];
if (elem.hasData.load()) {
env->SetLongArrayRegion(metrics, 0, kBufferSize, elem.buffer);
*dropCount = elem.dropCount;
mNextInQueue = (mNextInQueue + 1) % kRingSize;
elem.hasData = false;
return true;
}
return false;
}
void HardwareRendererObserver::notify(const int64_t* stats) {
FrameMetricsNotification& elem = mRingBuffer[mNextFree];
if (!elem.hasData.load()) {
memcpy(elem.buffer, stats, kBufferSize * sizeof(stats[0]));
elem.dropCount = mDroppedReports;
mDroppedReports = 0;
mNextFree = (mNextFree + 1) % kRingSize;
elem.hasData = true;
JNIEnv* env = getenv(mVm);
jobject target = env->NewLocalRef(mObserverWeak);
if (target != nullptr) {
env->CallVoidMethod(target, gHardwareRendererObserverClassInfo.callback);
env->DeleteLocalRef(target);
}
} else {
mDroppedReports++;
}
}
static jlong android_graphics_HardwareRendererObserver_createObserver(JNIEnv* env,
jobject observerObj) {
JavaVM* vm = nullptr;
if (env->GetJavaVM(&vm) != JNI_OK) {
LOG_ALWAYS_FATAL("Unable to get Java VM");
return 0;
}
HardwareRendererObserver* observer = new HardwareRendererObserver(vm, observerObj);
return reinterpret_cast<jlong>(observer);
}
static jint android_graphics_HardwareRendererObserver_getNextBuffer(JNIEnv* env, jobject,
jlong observerPtr,
jlongArray metrics) {
HardwareRendererObserver* observer = reinterpret_cast<HardwareRendererObserver*>(observerPtr);
int dropCount = 0;
if (observer->getNextBuffer(env, metrics, &dropCount)) {
return dropCount;
} else {
return -1;
}
}
static const std::array gMethods = {
MAKE_JNI_NATIVE_METHOD("nCreateObserver", "()J",
android_graphics_HardwareRendererObserver_createObserver),
MAKE_JNI_NATIVE_METHOD("nGetNextBuffer", "(J[J)I",
android_graphics_HardwareRendererObserver_getNextBuffer),
};
int register_android_graphics_HardwareRendererObserver(JNIEnv* env) {
jclass observerClass = FindClassOrDie(env, "android/graphics/HardwareRendererObserver");
gHardwareRendererObserverClassInfo.callback = GetMethodIDOrDie(env, observerClass,
"notifyDataAvailable", "()V");
return RegisterMethodsOrDie(env, "android/graphics/HardwareRendererObserver",
gMethods.data(), gMethods.size());
}
} // namespace android
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