SessionProcessorUtil.java
/*
* Copyright 2024 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.utils;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.RequiresApi;
import androidx.camera.core.FocusMeteringAction;
import androidx.camera.core.impl.RestrictedCameraInfo;
import androidx.camera.core.impl.SessionProcessor;
import java.util.ArrayList;
import java.util.List;
/**
* Utility class for session processor related operations.
*/
@RequiresApi(21) // TODO(b/200306659): Remove and replace with annotation on package-info.java
public final class SessionProcessorUtil {
private SessionProcessorUtil() {
}
/**
* Returns whether the camera operations are supported by the SessionProcessor.
*
* @param operations the camera operations to check.
* @return {@code true} if the operations can be supported, otherwise {@code false}.
*/
public static boolean isOperationSupported(@Nullable SessionProcessor sessionProcessor,
@NonNull @RestrictedCameraInfo.CameraOperation int... operations) {
if (sessionProcessor == null) {
return true;
}
// Arrays.asList doesn't work for int array.
List<Integer> operationList = new ArrayList<>(operations.length);
for (int operation : operations) {
operationList.add(operation);
}
return sessionProcessor.getSupportedCameraOperations().containsAll(operationList);
}
/**
* Returns the modified {@link FocusMeteringAction} that filters out unsupported AE/AF/AWB
* regions. Returns {@code null} if none of AF/AE/AWB regions can be supported after the
* filtering.
*/
@Nullable
public static FocusMeteringAction getModifiedFocusMeteringAction(
@Nullable SessionProcessor sessionProcessor, @NonNull FocusMeteringAction action) {
if (sessionProcessor == null) {
return action;
}
boolean shouldModify = false;
FocusMeteringAction.Builder builder = new FocusMeteringAction.Builder(action);
if (!action.getMeteringPointsAf().isEmpty()
&& !isOperationSupported(sessionProcessor,
RestrictedCameraInfo.CAMERA_OPERATION_AUTO_FOCUS,
RestrictedCameraInfo.CAMERA_OPERATION_AF_REGION)) {
shouldModify = true;
builder.removePoints(FocusMeteringAction.FLAG_AF);
}
if (!action.getMeteringPointsAe().isEmpty()
&& !isOperationSupported(sessionProcessor,
RestrictedCameraInfo.CAMERA_OPERATION_AE_REGION)) {
shouldModify = true;
builder.removePoints(FocusMeteringAction.FLAG_AE);
}
if (!action.getMeteringPointsAwb().isEmpty()
&& !isOperationSupported(sessionProcessor,
RestrictedCameraInfo.CAMERA_OPERATION_AWB_REGION)) {
shouldModify = true;
builder.removePoints(FocusMeteringAction.FLAG_AWB);
}
// Returns origin action if no need to modify.
if (!shouldModify) {
return action;
}
FocusMeteringAction modifyAction = builder.build();
if (modifyAction.getMeteringPointsAf().isEmpty()
&& modifyAction.getMeteringPointsAe().isEmpty()
&& modifyAction.getMeteringPointsAwb().isEmpty()) {
// All regions are not allowed, return null.
return null;
}
return builder.build();
}
}