1 /* 2 * Copyright (C) 2020 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License 15 */ 16 17 package com.android.systemui 18 19 import android.content.Context 20 import android.graphics.Path 21 import android.graphics.Rect 22 import android.graphics.RectF 23 import android.hardware.camera2.CameraManager 24 import android.util.PathParser 25 import java.util.concurrent.Executor 26 27 import kotlin.math.roundToInt 28 29 /** 30 * Listens for usage of the Camera and controls the ScreenDecorations transition to show extra 31 * protection around a display cutout based on config_frontBuiltInDisplayCutoutProtection and 32 * config_enableDisplayCutoutProtection 33 */ 34 class CameraAvailabilityListener( 35 private val cameraManager: CameraManager, 36 private val cutoutProtectionPath: Path, 37 private val targetCameraId: String, 38 excludedPackages: String, 39 private val executor: Executor 40 ) { 41 private var cutoutBounds = Rect() 42 private val excludedPackageIds: Set<String> 43 private val listeners = mutableListOf<CameraTransitionCallback>() 44 private val availabilityCallback: CameraManager.AvailabilityCallback = 45 object : CameraManager.AvailabilityCallback() { 46 override fun onCameraClosed(cameraId: String) { 47 if (targetCameraId == cameraId) { 48 notifyCameraInactive() 49 } 50 } 51 52 override fun onCameraOpened(cameraId: String, packageId: String) { 53 if (targetCameraId == cameraId && !isExcluded(packageId)) { 54 notifyCameraActive() 55 } 56 } 57 } 58 59 init { 60 val computed = RectF() 61 cutoutProtectionPath.computeBounds(computed, false /* unused */) 62 cutoutBounds.set( 63 computed.left.roundToInt(), 64 computed.top.roundToInt(), 65 computed.right.roundToInt(), 66 computed.bottom.roundToInt()) 67 excludedPackageIds = excludedPackages.split(",").toSet() 68 } 69 70 /** 71 * Start listening for availability events, and maybe notify listeners 72 * 73 * @return true if we started listening 74 */ 75 fun startListening() { 76 registerCameraListener() 77 } 78 79 fun stop() { 80 unregisterCameraListener() 81 } 82 83 fun addTransitionCallback(callback: CameraTransitionCallback) { 84 listeners.add(callback) 85 } 86 87 fun removeTransitionCallback(callback: CameraTransitionCallback) { 88 listeners.remove(callback) 89 } 90 91 private fun isExcluded(packageId: String): Boolean { 92 return excludedPackageIds.contains(packageId) 93 } 94 95 private fun registerCameraListener() { 96 cameraManager.registerAvailabilityCallback(executor, availabilityCallback) 97 } 98 99 private fun unregisterCameraListener() { 100 cameraManager.unregisterAvailabilityCallback(availabilityCallback) 101 } 102 103 private fun notifyCameraActive() { 104 listeners.forEach { it.onApplyCameraProtection(cutoutProtectionPath, cutoutBounds) } 105 } 106 107 private fun notifyCameraInactive() { 108 listeners.forEach { it.onHideCameraProtection() } 109 } 110 111 /** 112 * Callbacks to tell a listener that a relevant camera turned on and off. 113 */ 114 interface CameraTransitionCallback { 115 fun onApplyCameraProtection(protectionPath: Path, bounds: Rect) 116 fun onHideCameraProtection() 117 } 118 119 companion object Factory { 120 fun build(context: Context, executor: Executor): CameraAvailabilityListener { 121 val manager = context 122 .getSystemService(Context.CAMERA_SERVICE) as CameraManager 123 val res = context.resources 124 val pathString = res.getString(R.string.config_frontBuiltInDisplayCutoutProtection) 125 val cameraId = res.getString(R.string.config_protectedCameraId) 126 val excluded = res.getString(R.string.config_cameraProtectionExcludedPackages) 127 128 return CameraAvailabilityListener( 129 manager, pathFromString(pathString), cameraId, excluded, executor) 130 } 131 132 private fun pathFromString(pathString: String): Path { 133 val spec = pathString.trim() 134 val p: Path 135 try { 136 p = PathParser.createPathFromPathData(spec) 137 } catch (e: Throwable) { 138 throw IllegalArgumentException("Invalid protection path", e) 139 } 140 141 return p 142 } 143 } 144 } 145