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/*
* Copyright (C) 2023 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 com.android.systemui.keyguard
import android.annotation.WorkerThread
import android.content.ComponentCallbacks2
import android.graphics.HardwareRenderer
import android.os.Trace
import android.util.Log
import com.android.systemui.CoreStartable
import com.android.systemui.dagger.SysUISingleton
import com.android.systemui.dagger.qualifiers.Application
import com.android.systemui.dagger.qualifiers.Background
import com.android.systemui.flags.FeatureFlags
import com.android.systemui.flags.Flags
import com.android.systemui.keyguard.domain.interactor.KeyguardInteractor
import com.android.systemui.keyguard.domain.interactor.KeyguardTransitionInteractor
import com.android.systemui.keyguard.shared.model.TransitionState
import com.android.systemui.keyguard.shared.model.WakefulnessState
import com.android.systemui.utils.GlobalWindowManager
import javax.inject.Inject
import kotlinx.coroutines.CoroutineDispatcher
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.flow.combine
import kotlinx.coroutines.flow.distinctUntilChanged
import kotlinx.coroutines.flow.map
import kotlinx.coroutines.launch
/**
* Releases cached resources on allocated by keyguard.
*
* We release most resources when device goes idle since that's the least likely time it'll cause
* jank during use. Idle in this case means after lockscreen -> AoD transition completes or when the
* device screen is turned off, depending on settings.
*/
@SysUISingleton
class ResourceTrimmer
@Inject
constructor(
private val keyguardInteractor: KeyguardInteractor,
private val keyguardTransitionInteractor: KeyguardTransitionInteractor,
private val globalWindowManager: GlobalWindowManager,
@Application private val applicationScope: CoroutineScope,
@Background private val bgDispatcher: CoroutineDispatcher,
private val featureFlags: FeatureFlags,
) : CoreStartable, WakefulnessLifecycle.Observer {
override fun start() {
Log.d(LOG_TAG, "Resource trimmer registered.")
if (featureFlags.isEnabled(Flags.TRIM_RESOURCES_WITH_BACKGROUND_TRIM_AT_LOCK)) {
applicationScope.launch(bgDispatcher) {
// We need to wait for the AoD transition (and animation) to complete.
// This means we're waiting for isDreaming (== implies isDoze) and dozeAmount == 1f
// signal. This is to make sure we don't clear font caches during animation which
// would jank and leave stale data in memory.
val isDozingFully =
keyguardInteractor.dozeAmount.map { it == 1f }.distinctUntilChanged()
combine(
keyguardInteractor.wakefulnessModel.map { it.state },
keyguardInteractor.isDreaming,
isDozingFully,
::Triple
)
.distinctUntilChanged()
.collect { onWakefulnessUpdated(it.first, it.second, it.third) }
}
}
applicationScope.launch(bgDispatcher) {
// We drop 1 to avoid triggering on initial collect().
keyguardTransitionInteractor.anyStateToGoneTransition.collect { transition ->
if (transition.transitionState == TransitionState.FINISHED) {
onKeyguardGone()
}
}
}
}
@WorkerThread
private fun onKeyguardGone() {
// We want to clear temporary caches we've created while rendering and animating
// lockscreen elements, especially clocks.
Log.d(LOG_TAG, "Sending TRIM_MEMORY_UI_HIDDEN.")
globalWindowManager.trimMemory(ComponentCallbacks2.TRIM_MEMORY_UI_HIDDEN)
if (featureFlags.isEnabled(Flags.TRIM_FONT_CACHES_AT_UNLOCK)) {
if (DEBUG) {
Log.d(LOG_TAG, "Trimming font caches since keyguard went away.")
}
globalWindowManager.trimCaches(HardwareRenderer.CACHE_TRIM_FONT)
}
}
@WorkerThread
private fun onWakefulnessUpdated(
wakefulness: WakefulnessState,
isDreaming: Boolean,
isDozingFully: Boolean
) {
if (!featureFlags.isEnabled(Flags.TRIM_RESOURCES_WITH_BACKGROUND_TRIM_AT_LOCK)) {
return
}
if (DEBUG) {
Log.d(
LOG_TAG,
"Wakefulness: $wakefulness Dreaming: $isDreaming DozeAmount: $isDozingFully"
)
}
// There are three scenarios:
// * No dozing and no AoD at all - where we go directly to ASLEEP with isDreaming = false
// and dozeAmount == 0f
// * Dozing without Aod - where we go to ASLEEP with isDreaming = true and dozeAmount jumps
// to 1f
// * AoD - where we go to ASLEEP with iDreaming = true and dozeAmount slowly increases
// to 1f
val dozeDisabledAndScreenOff = wakefulness == WakefulnessState.ASLEEP && !isDreaming
val dozeEnabledAndDozeAnimationCompleted =
wakefulness == WakefulnessState.ASLEEP && isDreaming && isDozingFully
if (dozeDisabledAndScreenOff || dozeEnabledAndDozeAnimationCompleted) {
Trace.beginSection("ResourceTrimmer#trimMemory")
Log.d(LOG_TAG, "SysUI asleep, trimming memory.")
globalWindowManager.trimMemory(ComponentCallbacks2.TRIM_MEMORY_UI_HIDDEN)
globalWindowManager.trimCaches(HardwareRenderer.CACHE_TRIM_ALL)
Trace.endSection()
}
}
companion object {
private const val LOG_TAG = "ResourceTrimmer"
private val DEBUG = Log.isLoggable(LOG_TAG, Log.DEBUG)
}
}
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