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[camerax] Wrap Android classes/methods required to set the exposure m…
…ode (flutter#5966) Wraps classes/methods needed to set capture request options that will allow us to implement setting the exposure mode, namely: **Camera2CameraControl** - `create` method using [`from`](https://developer.android.com/reference/androidx/camera/camera2/interop/Camera2CameraControl#from(androidx.camera.core.CameraControl)) - [`setCaptureRequestOptions`](https://developer.android.com/reference/androidx/camera/camera2/interop/Camera2CameraControl#setCaptureRequestOptions(androidx.camera.camera2.interop.CaptureRequestOptions)) **CaptureRequestOptions** - `create` method using its [builder](https://developer.android.com/reference/androidx/camera/camera2/interop/CaptureRequestOptions.Builder)* Part of flutter/flutter#120468. *Note that this required that I specify types of supported capture request options due to the Dart/native split. I took inspiration from our previous implementation of supported `LiveData` types (see [pigeon file](https://github.com/flutter/packages/blob/73c9bdc59b8d51ee558bff113bcdcdb53485cd08/packages/camera/camera_android_camerax/pigeons/camerax_library.dart#L80) for details).
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140 changes: 140 additions & 0 deletions
140
...rax/android/src/main/java/io/flutter/plugins/camerax/Camera2CameraControlHostApiImpl.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| // Copyright 2013 The Flutter Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
|
|
||
| package io.flutter.plugins.camerax; | ||
|
|
||
| import android.content.Context; | ||
| import androidx.annotation.NonNull; | ||
| import androidx.annotation.OptIn; | ||
| import androidx.annotation.VisibleForTesting; | ||
| import androidx.camera.camera2.interop.Camera2CameraControl; | ||
| import androidx.camera.camera2.interop.CaptureRequestOptions; | ||
| import androidx.camera.core.CameraControl; | ||
| import androidx.core.content.ContextCompat; | ||
| import com.google.common.util.concurrent.FutureCallback; | ||
| import com.google.common.util.concurrent.Futures; | ||
| import com.google.common.util.concurrent.ListenableFuture; | ||
| import io.flutter.plugins.camerax.GeneratedCameraXLibrary.Camera2CameraControlHostApi; | ||
| import java.util.Objects; | ||
|
|
||
| /** | ||
| * Host API implementation for {@link Camera2CameraControl}. | ||
| * | ||
| * <p>This class may handle instantiating and adding native object instances that are attached to a | ||
| * Dart instance or handle method calls on the associated native class or an instance of the class. | ||
| */ | ||
| public class Camera2CameraControlHostApiImpl implements Camera2CameraControlHostApi { | ||
| private final InstanceManager instanceManager; | ||
| private final Camera2CameraControlProxy proxy; | ||
|
|
||
| /** Proxy for constructor and methods of {@link Camera2CameraControl}. */ | ||
| @VisibleForTesting | ||
| public static class Camera2CameraControlProxy { | ||
| Context context; | ||
|
|
||
| /** | ||
| * Creates an instance of {@link Camera2CameraControl} derived from specified {@link | ||
| * CameraControl} instance. | ||
| */ | ||
| @OptIn(markerClass = androidx.camera.camera2.interop.ExperimentalCamera2Interop.class) | ||
| public @NonNull Camera2CameraControl create(@NonNull CameraControl cameraControl) { | ||
| return Camera2CameraControl.from(cameraControl); | ||
| } | ||
|
|
||
| /** | ||
| * Adds a {@link CaptureRequestOptions} to update the capture session with the options it | ||
| * contains. | ||
| */ | ||
| @OptIn(markerClass = androidx.camera.camera2.interop.ExperimentalCamera2Interop.class) | ||
| public void addCaptureRequestOptions( | ||
| @NonNull Camera2CameraControl camera2CameraControl, | ||
| @NonNull CaptureRequestOptions bundle, | ||
| @NonNull GeneratedCameraXLibrary.Result<Void> result) { | ||
| if (context == null) { | ||
| throw new IllegalStateException("Context must be set to add capture request options."); | ||
| } | ||
|
|
||
| ListenableFuture<Void> addCaptureRequestOptionsFuture = | ||
| camera2CameraControl.addCaptureRequestOptions(bundle); | ||
|
|
||
| Futures.addCallback( | ||
| addCaptureRequestOptionsFuture, | ||
| new FutureCallback<Void>() { | ||
| public void onSuccess(Void voidResult) { | ||
| result.success(null); | ||
| } | ||
|
|
||
| public void onFailure(Throwable t) { | ||
| result.error(t); | ||
| } | ||
| }, | ||
| ContextCompat.getMainExecutor(context)); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Constructs a {@link Camera2CameraControlHostApiImpl}. | ||
| * | ||
| * @param instanceManager maintains instances stored to communicate with attached Dart objects | ||
| * @param context {@link Context} used to retrieve {@code Executor} | ||
| */ | ||
| public Camera2CameraControlHostApiImpl( | ||
| @NonNull InstanceManager instanceManager, @NonNull Context context) { | ||
| this(instanceManager, new Camera2CameraControlProxy(), context); | ||
| } | ||
|
|
||
| /** | ||
| * Constructs a {@link Camera2CameraControlHostApiImpl}. | ||
| * | ||
| * @param instanceManager maintains instances stored to communicate with attached Dart objects | ||
| * @param proxy proxy for constructor and methods of {@link Camera2CameraControl} | ||
| * @param context {@link Context} used to retrieve {@code Executor} | ||
| */ | ||
| @VisibleForTesting | ||
| Camera2CameraControlHostApiImpl( | ||
| @NonNull InstanceManager instanceManager, | ||
| @NonNull Camera2CameraControlProxy proxy, | ||
| @NonNull Context context) { | ||
| this.instanceManager = instanceManager; | ||
| this.proxy = proxy; | ||
| proxy.context = context; | ||
| } | ||
|
|
||
| /** | ||
| * Sets the context that the {@code Camera2CameraControl} will use to listen for the result of | ||
| * setting capture request options. | ||
| * | ||
| * <p>If using the camera plugin in an add-to-app context, ensure that this is called anytime that | ||
| * the context changes. | ||
| */ | ||
| public void setContext(@NonNull Context context) { | ||
| this.proxy.context = context; | ||
| } | ||
|
|
||
| @Override | ||
| public void create(@NonNull Long identifier, @NonNull Long cameraControlIdentifier) { | ||
| instanceManager.addDartCreatedInstance( | ||
| proxy.create(Objects.requireNonNull(instanceManager.getInstance(cameraControlIdentifier))), | ||
| identifier); | ||
| } | ||
|
|
||
| @Override | ||
| public void addCaptureRequestOptions( | ||
| @NonNull Long identifier, | ||
| @NonNull Long captureRequestOptionsIdentifier, | ||
| @NonNull GeneratedCameraXLibrary.Result<Void> result) { | ||
| proxy.addCaptureRequestOptions( | ||
| getCamera2CameraControlInstance(identifier), | ||
| Objects.requireNonNull(instanceManager.getInstance(captureRequestOptionsIdentifier)), | ||
| result); | ||
| } | ||
|
|
||
| /** | ||
| * Retrieves the {@link Camera2CameraControl} instance associated with the specified {@code | ||
| * identifier}. | ||
| */ | ||
| private Camera2CameraControl getCamera2CameraControlInstance(@NonNull Long identifier) { | ||
| return Objects.requireNonNull(instanceManager.getInstance(identifier)); | ||
| } | ||
| } |
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118 changes: 118 additions & 0 deletions
118
...ax/android/src/main/java/io/flutter/plugins/camerax/CaptureRequestOptionsHostApiImpl.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| // Copyright 2013 The Flutter Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
|
|
||
| package io.flutter.plugins.camerax; | ||
|
|
||
| import android.hardware.camera2.CaptureRequest; | ||
| import androidx.annotation.NonNull; | ||
| import androidx.annotation.OptIn; | ||
| import androidx.annotation.VisibleForTesting; | ||
| import androidx.camera.camera2.interop.CaptureRequestOptions; | ||
| import io.flutter.plugins.camerax.GeneratedCameraXLibrary.CaptureRequestKeySupportedType; | ||
| import io.flutter.plugins.camerax.GeneratedCameraXLibrary.CaptureRequestOptionsHostApi; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
|
|
||
| /** | ||
| * Host API implementation for {@link CaptureRequestOptions}. | ||
| * | ||
| * <p>This class may handle instantiating and adding native object instances that are attached to a | ||
| * Dart instance or handle method calls on the associated native class or an instance of the class. | ||
| */ | ||
| public class CaptureRequestOptionsHostApiImpl implements CaptureRequestOptionsHostApi { | ||
| private final InstanceManager instanceManager; | ||
| private final CaptureRequestOptionsProxy proxy; | ||
|
|
||
| /** Proxy for constructor of {@link CaptureRequestOptions}. */ | ||
| @VisibleForTesting | ||
| public static class CaptureRequestOptionsProxy { | ||
| /** Creates an instance of {@link CaptureRequestOptions}. */ | ||
| // Suppression is safe because the type shared between the key and value pairs that | ||
| // represent capture request options is checked on the Dart side. | ||
| @SuppressWarnings("unchecked") | ||
| @OptIn(markerClass = androidx.camera.camera2.interop.ExperimentalCamera2Interop.class) | ||
| public @NonNull CaptureRequestOptions create( | ||
| @NonNull Map<CaptureRequestKeySupportedType, Object> options) { | ||
| CaptureRequestOptions.Builder builder = getCaptureRequestOptionsBuilder(); | ||
|
|
||
| for (Map.Entry<CaptureRequestKeySupportedType, Object> option : options.entrySet()) { | ||
| CaptureRequestKeySupportedType optionKeyType = option.getKey(); | ||
| CaptureRequest.Key<? extends Object> optionKey = getCaptureRequestKey(optionKeyType); | ||
| Object optionValue = option.getValue(); | ||
|
|
||
| if (optionValue == null) { | ||
| builder.clearCaptureRequestOption(optionKey); | ||
| continue; | ||
| } | ||
|
|
||
| switch (optionKeyType) { | ||
| case CONTROL_AE_LOCK: | ||
| builder.setCaptureRequestOption( | ||
| (CaptureRequest.Key<Boolean>) optionKey, (Boolean) optionValue); | ||
| break; | ||
| default: | ||
| throw new IllegalArgumentException( | ||
| "The capture request key " | ||
| + optionKeyType.toString() | ||
| + "is not currently supported by the plugin."); | ||
| } | ||
| } | ||
|
|
||
| return builder.build(); | ||
| } | ||
|
|
||
| private CaptureRequest.Key<? extends Object> getCaptureRequestKey( | ||
| CaptureRequestKeySupportedType type) { | ||
| CaptureRequest.Key<? extends Object> key; | ||
| switch (type) { | ||
| case CONTROL_AE_LOCK: | ||
| key = CaptureRequest.CONTROL_AE_LOCK; | ||
| break; | ||
| default: | ||
| throw new IllegalArgumentException( | ||
| "The capture request key is not currently supported by the plugin."); | ||
| } | ||
| return key; | ||
| } | ||
|
|
||
| @VisibleForTesting | ||
| @OptIn(markerClass = androidx.camera.camera2.interop.ExperimentalCamera2Interop.class) | ||
| public @NonNull CaptureRequestOptions.Builder getCaptureRequestOptionsBuilder() { | ||
| return new CaptureRequestOptions.Builder(); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Constructs a {@link CaptureRequestOptionsHostApiImpl}. | ||
| * | ||
| * @param instanceManager maintains instances stored to communicate with attached Dart objects | ||
| */ | ||
| public CaptureRequestOptionsHostApiImpl(@NonNull InstanceManager instanceManager) { | ||
| this(instanceManager, new CaptureRequestOptionsProxy()); | ||
| } | ||
|
|
||
| /** | ||
| * Constructs a {@link CaptureRequestOptionsHostApiImpl}. | ||
| * | ||
| * @param instanceManager maintains instances stored to communicate with attached Dart objects | ||
| * @param proxy proxy for constructor of {@link CaptureRequestOptions} | ||
| */ | ||
| @VisibleForTesting | ||
| CaptureRequestOptionsHostApiImpl( | ||
| @NonNull InstanceManager instanceManager, @NonNull CaptureRequestOptionsProxy proxy) { | ||
| this.instanceManager = instanceManager; | ||
| this.proxy = proxy; | ||
| } | ||
|
|
||
| @Override | ||
| public void create(@NonNull Long identifier, @NonNull Map<Long, Object> options) { | ||
| Map<CaptureRequestKeySupportedType, Object> decodedOptions = | ||
| new HashMap<CaptureRequestKeySupportedType, Object>(); | ||
| for (Map.Entry<Long, Object> option : options.entrySet()) { | ||
| decodedOptions.put( | ||
| CaptureRequestKeySupportedType.values()[option.getKey().intValue()], option.getValue()); | ||
| } | ||
| instanceManager.addDartCreatedInstance(proxy.create(decodedOptions), identifier); | ||
| } | ||
| } |
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