RestrictedCameraInfo.java
/*
* Copyright 2023 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.Range;
import android.util.Rational;
import androidx.annotation.NonNull;
import androidx.annotation.RequiresApi;
import androidx.camera.core.ExposureState;
import androidx.camera.core.FocusMeteringAction;
import androidx.camera.core.TorchState;
import androidx.camera.core.ZoomState;
import androidx.camera.core.internal.ImmutableZoomState;
import androidx.lifecycle.LiveData;
import androidx.lifecycle.MutableLiveData;
/**
* A {@link CameraInfoInternal} that returns disabled state if the corresponding operation in the
* given {@link RestrictedCameraControl} is disabled.
*/
@RequiresApi(21) // TODO(b/200306659): Remove and replace with annotation on package-info.java
public class RestrictedCameraInfo extends ForwardingCameraInfo {
private final CameraInfoInternal mCameraInfo;
private final RestrictedCameraControl mRestrictedCameraControl;
public RestrictedCameraInfo(@NonNull CameraInfoInternal cameraInfo,
@NonNull RestrictedCameraControl restrictedCameraControl) {
super(cameraInfo);
mCameraInfo = cameraInfo;
mRestrictedCameraControl = restrictedCameraControl;
}
@NonNull
@Override
public CameraInfoInternal getImplementation() {
return mCameraInfo;
}
@Override
public boolean hasFlashUnit() {
if (!mRestrictedCameraControl.isOperationSupported(RestrictedCameraControl.FLASH)) {
return false;
}
return mCameraInfo.hasFlashUnit();
}
@NonNull
@Override
public LiveData<Integer> getTorchState() {
if (!mRestrictedCameraControl.isOperationSupported(RestrictedCameraControl.TORCH)) {
return new MutableLiveData<>(TorchState.OFF);
}
return mCameraInfo.getTorchState();
}
@NonNull
@Override
public LiveData<ZoomState> getZoomState() {
if (!mRestrictedCameraControl.isOperationSupported(RestrictedCameraControl.ZOOM)) {
return new MutableLiveData<>(ImmutableZoomState.create(
/* zoomRatio */1f, /* maxZoomRatio */ 1f,
/* minZoomRatio */ 1f, /* linearZoom*/ 0f));
}
return mCameraInfo.getZoomState();
}
@NonNull
@Override
public ExposureState getExposureState() {
if (!mRestrictedCameraControl.isOperationSupported(
RestrictedCameraControl.EXPOSURE_COMPENSATION)) {
return new ExposureState() {
@Override
public int getExposureCompensationIndex() {
return 0;
}
@NonNull
@Override
public Range<Integer> getExposureCompensationRange() {
return new Range<>(0, 0);
}
@NonNull
@Override
public Rational getExposureCompensationStep() {
return Rational.ZERO;
}
@Override
public boolean isExposureCompensationSupported() {
return false;
}
};
}
return mCameraInfo.getExposureState();
}
@Override
public boolean isFocusMeteringSupported(@NonNull FocusMeteringAction action) {
if (mRestrictedCameraControl.getModifiedFocusMeteringAction(action) == null) {
return false;
}
return mCameraInfo.isFocusMeteringSupported(action);
}
}