CaptureProcessor.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.impl;

import android.util.Size;
import android.view.Surface;

import androidx.camera.core.ImageCapture;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;

/**
 * A processing step of the image capture pipeline.
 */
public interface CaptureProcessor {
    /**
     * This gets called to update where the CaptureProcessor should write the output of {@link
     * #process(ImageProxyBundle)}.
     *
     * @param surface The {@link Surface} that the CaptureProcessor should write data into.
     * @param imageFormat The format of that the surface expects.
     */
    void onOutputSurface(Surface surface, int imageFormat);

    /**
     * Process a {@link ImageProxyBundle} for the set of captures that were
     * requested.
     *
     * <p> A result of the processing step must be written to the {@link Surface} that was
     * received by {@link #onOutputSurface(Surface, int)}. Otherwise, it might cause the
     * {@link ImageCapture#takePicture} can't be complete or frame lost in {@link Preview}.
     * @param bundle The set of images to process. The ImageProxyBundle and the {@link ImageProxy}
     *               that are retrieved from it will become invalid after this method completes, so
     *               no references to them should be kept.
     */
    void process(ImageProxyBundle bundle);

    /**
     * This will be invoked when the input surface resolution is updated.
     *
     * @param size for the surface.
     */
    void onResolutionUpdate(Size size);
}