ZoomState.java
/*
* Copyright 2020 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;
import androidx.annotation.RequiresApi;
/**
* An interface which contains the zoom related information from a camera.
*
* <p>Applications can retrieve an instance via {@link CameraInfo#getZoomState()}.
*/
@RequiresApi(21) // TODO(b/200306659): Remove and replace with annotation on package-info.java
public interface ZoomState {
/**
* Returns the zoom ratio. The value is 1.0 by default.
*/
float getZoomRatio();
/** Returns the maximum zoom ratio. */
float getMaxZoomRatio();
/**
* Returns the minimum zoom ratio.
*
* <p>Typically 1.0, but can be less than 1.0 if the camera device supports zoom-out (only on
* android 11 or later).
*/
float getMinZoomRatio();
/**
* Returns the linearZoom which is in range [0..1].
*
* <p>LinearZoom 0 represents the minimum zoom while linearZoom 1.0 represents the maximum zoom.
*/
float getLinearZoom();
}