| /* |
| * Copyright (C) 2019 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 android.view; |
| |
| import android.graphics.Rect; |
| import android.os.IBinder; |
| |
| import com.android.internal.util.Preconditions; |
| |
| import java.util.concurrent.Executor; |
| |
| /** |
| * Listener for sampling the result of the screen composition. |
| * {@hide} |
| */ |
| public abstract class CompositionSamplingListener { |
| |
| private final long mNativeListener; |
| private final Executor mExecutor; |
| |
| public CompositionSamplingListener(Executor executor) { |
| mExecutor = executor; |
| mNativeListener = nativeCreate(this); |
| } |
| |
| @Override |
| protected void finalize() throws Throwable { |
| try { |
| if (mNativeListener != 0) { |
| unregister(this); |
| nativeDestroy(mNativeListener); |
| } |
| } finally { |
| super.finalize(); |
| } |
| } |
| |
| /** |
| * Reports a luma sample from the registered region. |
| */ |
| public abstract void onSampleCollected(float medianLuma); |
| |
| /** |
| * Registers a sampling listener. |
| */ |
| public static void register(CompositionSamplingListener listener, |
| int displayId, IBinder stopLayer, Rect samplingArea) { |
| Preconditions.checkArgument(displayId == Display.DEFAULT_DISPLAY, |
| "default display only for now"); |
| nativeRegister(listener.mNativeListener, stopLayer, samplingArea.left, samplingArea.top, |
| samplingArea.right, samplingArea.bottom); |
| } |
| |
| /** |
| * Unregisters a sampling listener. |
| */ |
| public static void unregister(CompositionSamplingListener listener) { |
| nativeUnregister(listener.mNativeListener); |
| } |
| |
| /** |
| * Dispatch the collected sample. |
| * |
| * Called from native code on a binder thread. |
| */ |
| private static void dispatchOnSampleCollected(CompositionSamplingListener listener, |
| float medianLuma) { |
| listener.mExecutor.execute(() -> listener.onSampleCollected(medianLuma)); |
| } |
| |
| private static native long nativeCreate(CompositionSamplingListener thiz); |
| private static native void nativeDestroy(long ptr); |
| private static native void nativeRegister(long ptr, IBinder stopLayer, |
| int samplingAreaLeft, int top, int right, int bottom); |
| private static native void nativeUnregister(long ptr); |
| } |