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.IntDef;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
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.impl.utils.SessionProcessorUtil;
import androidx.camera.core.internal.ImmutableZoomState;
import androidx.lifecycle.LiveData;
import androidx.lifecycle.MutableLiveData;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
/**
* 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 {
/**
* Defines the list of supported camera operations.
*/
public static final int CAMERA_OPERATION_ZOOM = 0;
public static final int CAMERA_OPERATION_AUTO_FOCUS = 1;
public static final int CAMERA_OPERATION_AF_REGION = 2;
public static final int CAMERA_OPERATION_AE_REGION = 3;
public static final int CAMERA_OPERATION_AWB_REGION = 4;
public static final int CAMERA_OPERATION_FLASH = 5;
public static final int CAMERA_OPERATION_TORCH = 6;
public static final int CAMERA_OPERATION_EXPOSURE_COMPENSATION = 7;
public static final int CAMERA_OPERATION_EXTENSION_STRENGTH = 8;
@IntDef({CAMERA_OPERATION_ZOOM, CAMERA_OPERATION_AUTO_FOCUS, CAMERA_OPERATION_AF_REGION,
CAMERA_OPERATION_AE_REGION, CAMERA_OPERATION_AWB_REGION, CAMERA_OPERATION_FLASH,
CAMERA_OPERATION_TORCH, CAMERA_OPERATION_EXPOSURE_COMPENSATION,
CAMERA_OPERATION_EXTENSION_STRENGTH})
@Retention(RetentionPolicy.SOURCE)
public @interface CameraOperation {
}
private final CameraInfoInternal mCameraInfo;
@Nullable
private final SessionProcessor mSessionProcessor;
private boolean mIsPostviewSupported = false;
private boolean mIsCaptureProcessProgressSupported = false;
@NonNull
private final CameraConfig mCameraConfig;
public RestrictedCameraInfo(@NonNull CameraInfoInternal cameraInfo,
@NonNull CameraConfig cameraConfig) {
super(cameraInfo);
mCameraInfo = cameraInfo;
mCameraConfig = cameraConfig;
mSessionProcessor = cameraConfig.getSessionProcessor(null);
setPostviewSupported(cameraConfig.isPostviewSupported());
setCaptureProcessProgressSupported(cameraConfig.isCaptureProcessProgressSupported());
}
@NonNull
public CameraConfig getCameraConfig() {
return mCameraConfig;
}
@NonNull
@Override
public CameraInfoInternal getImplementation() {
return mCameraInfo;
}
/**
* Returns the session processor associated with the RestrictedCameraInfo.
*/
@Nullable
public SessionProcessor getSessionProcessor() {
return mSessionProcessor;
}
@Override
public boolean hasFlashUnit() {
if (!SessionProcessorUtil.isOperationSupported(mSessionProcessor, CAMERA_OPERATION_FLASH)) {
return false;
}
return mCameraInfo.hasFlashUnit();
}
@NonNull
@Override
public LiveData<Integer> getTorchState() {
if (!SessionProcessorUtil.isOperationSupported(mSessionProcessor, CAMERA_OPERATION_TORCH)) {
return new MutableLiveData<>(TorchState.OFF);
}
return mCameraInfo.getTorchState();
}
@NonNull
@Override
public LiveData<ZoomState> getZoomState() {
if (!SessionProcessorUtil.isOperationSupported(mSessionProcessor, CAMERA_OPERATION_ZOOM)) {
return new MutableLiveData<>(ImmutableZoomState.create(
/* zoomRatio */1f, /* maxZoomRatio */ 1f,
/* minZoomRatio */ 1f, /* linearZoom*/ 0f));
}
return mCameraInfo.getZoomState();
}
@NonNull
@Override
public ExposureState getExposureState() {
if (!SessionProcessorUtil.isOperationSupported(mSessionProcessor,
CAMERA_OPERATION_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) {
FocusMeteringAction modifiedAction =
SessionProcessorUtil.getModifiedFocusMeteringAction(mSessionProcessor, action);
if (modifiedAction == null) {
return false;
}
return mCameraInfo.isFocusMeteringSupported(modifiedAction);
}
/**
* Sets if postview is supported or not.
*/
public void setPostviewSupported(boolean isPostviewSupported) {
mIsPostviewSupported = isPostviewSupported;
}
/**
* Sets if capture process progress is supported or not.
*/
public void setCaptureProcessProgressSupported(boolean isCaptureProcessProgressSupported) {
mIsCaptureProcessProgressSupported = isCaptureProcessProgressSupported;
}
/**
* Returns if postview is supported.
*/
@Override
public boolean isPostviewSupported() {
return mIsPostviewSupported;
}
@Override
public boolean isCaptureProcessProgressSupported() {
return mIsCaptureProcessProgressSupported;
}
}