CameraExtensionsControls.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.extensions;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.RequiresApi;
import androidx.camera.core.CameraControl;
import androidx.camera.core.impl.RestrictedCameraControl;
import androidx.camera.core.impl.SessionProcessor;
import androidx.core.util.Preconditions;
/**
* Utility methods for operating on {@link CameraExtensionsControl} instances.
*/
@RequiresApi(21) // TODO(b/200306659): Remove and replace with annotation on package-info.java
class CameraExtensionsControls {
/**
* Returns a {@link CameraExtensionsControl} instance converted from a {@link CameraControl}
* object when the {@link CameraControl} is retrieved from a extensions-enabled camera.
* Otherwise, returns {@code null}.
*/
@Nullable
static CameraExtensionsControl from(@NonNull CameraControl cameraControl) {
Preconditions.checkArgument(cameraControl instanceof RestrictedCameraControl, "The input "
+ "camera control must be an instance retrieved from the camera that is returned "
+ "by invoking CameraProvider#bindToLifecycle() with an extension enabled camera "
+ "selector.");
SessionProcessor sessionProcessor =
((RestrictedCameraControl) cameraControl).getSessionProcessor();
if (sessionProcessor instanceof CameraExtensionsControl) {
return (CameraExtensionsControl) sessionProcessor;
} else {
return null;
}
}
private CameraExtensionsControls() {
}
}