MeteringRegionCorrection.java
/*
* Copyright 2022 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.camera2.internal.compat.workaround;
import android.graphics.PointF;
import androidx.annotation.NonNull;
import androidx.annotation.RequiresApi;
import androidx.camera.camera2.internal.compat.quirk.AfRegionFlipHorizontallyQuirk;
import androidx.camera.core.FocusMeteringAction;
import androidx.camera.core.MeteringPoint;
import androidx.camera.core.impl.Quirks;
/**
* Correct the metering point if necessary. For some devices, Af region coordinates are flipped
* horizontally by OEM, hence we should flip it to fix the issue.
*/
@RequiresApi(21) // TODO(b/200306659): Remove and replace with annotation on package-info.java
public class MeteringRegionCorrection {
private final Quirks mCameraQuirks;
public MeteringRegionCorrection(@NonNull Quirks cameraQuirks) {
mCameraQuirks = cameraQuirks;
}
/**
* Return corrected normalized point by given MeteringPoint and MeteringMode.
*/
@NonNull
public PointF getCorrectedPoint(@NonNull MeteringPoint meteringPoint,
@FocusMeteringAction.MeteringMode int meteringMode) {
if (meteringMode == FocusMeteringAction.FLAG_AF
&& mCameraQuirks.contains(AfRegionFlipHorizontallyQuirk.class)) {
return new PointF(1f - meteringPoint.getX(), meteringPoint.getY());
}
return new PointF(meteringPoint.getX(), meteringPoint.getY());
}
}