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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 "jni.h"
#include <FrameInfo.h>
#include <FrameMetricsObserver.h>
namespace android {
/*
* Implements JNI layer for hwui frame metrics reporting.
*/
class HardwareRendererObserver : public uirenderer::FrameMetricsObserver {
public:
HardwareRendererObserver(JavaVM *vm, jobject observer);
~HardwareRendererObserver();
/**
* Retrieves frame metrics for the oldest frame that the renderer has retained. The renderer
* will retain a buffer until it has been retrieved, via this method, or its internal storage
* is exhausted at which point it informs the caller of how many frames it has failed to store
* since the last time this method was invoked.
* @param env java env required to populate the provided buffer array
* @param metrics output parameter that represents the buffer of metrics that is to be filled
* @param dropCount output parameter that is updated to reflect the number of buffers that were
discarded since the last successful invocation of this method.
* @return true if there was data to populate the array and false otherwise. If false then
* neither the metrics buffer or dropCount will be modified.
*/
bool getNextBuffer(JNIEnv* env, jlongArray metrics, int* dropCount);
void notify(const int64_t* stats) override;
private:
static constexpr int kBufferSize = static_cast<int>(uirenderer::FrameInfoIndex::NumIndexes);
static constexpr int kRingSize = 3;
class FrameMetricsNotification {
public:
FrameMetricsNotification() {}
std::atomic_bool hasData = false;
int64_t buffer[kBufferSize];
int dropCount = 0;
private:
// non-copyable
FrameMetricsNotification(const FrameMetricsNotification&) = delete;
FrameMetricsNotification& operator=(const FrameMetricsNotification& ) = delete;
};
JavaVM* const mVm;
jweak mObserverWeak;
int mNextFree = 0;
int mNextInQueue = 0;
FrameMetricsNotification mRingBuffer[kRingSize];
int mDroppedReports = 0;
};
} // namespace android
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