ImageAnalysisAbstractAnalyzer.java
/*
* Copyright 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.
*/
package androidx.camera.core;
import android.os.Handler;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
/**
* Abstract Analyzer that wraps around {@link ImageAnalysis.Analyzer} and implements
* {@link ImageReaderProxy.OnImageAvailableListener}.
*
* This is an extension of {@link ImageAnalysis}. It has the same lifecycle and share part of the
* states.
*/
abstract class ImageAnalysisAbstractAnalyzer implements ImageReaderProxy.OnImageAvailableListener {
// Member variables from ImageAnalysis.
private final AtomicReference<ImageAnalysis.Analyzer> mSubscribedAnalyzer;
private final AtomicInteger mRelativeRotation;
final Handler mUserHandler;
// Flag that reflects the state of ImageAnalysis.
private AtomicBoolean mIsClosed;
ImageAnalysisAbstractAnalyzer(AtomicReference<ImageAnalysis.Analyzer> subscribedAnalyzer,
AtomicInteger relativeRotation, Handler userHandler) {
mSubscribedAnalyzer = subscribedAnalyzer;
mRelativeRotation = relativeRotation;
mUserHandler = userHandler;
mIsClosed = new AtomicBoolean(false);
}
/**
* Analyzes a {@link ImageProxy} using the wrapped {@link ImageAnalysis.Analyzer}.
*/
void analyzeImage(ImageProxy imageProxy) {
ImageAnalysis.Analyzer analyzer = mSubscribedAnalyzer.get();
if (analyzer != null && !isClosed()) {
// When the analyzer exists and ImageAnalysis is active.
analyzer.analyze(imageProxy, mRelativeRotation.get());
}
}
/**
* Initialize the callback.
*/
void open() {
mIsClosed.set(false);
}
/**
* Closes the callback so that it will stop posting to analyzer.
*/
void close() {
mIsClosed.set(true);
}
boolean isClosed() {
return mIsClosed.get();
}
}