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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "InputTaskManager.h"
#include "VsyncTaskManager.h"
#include "nsRefreshDriver.h"
namespace mozilla {
StaticRefPtr<InputTaskManager> InputTaskManager::gInputTaskManager;
void InputTaskManager::EnableInputEventPrioritization() {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(mInputQueueState == STATE_DISABLED);
mInputQueueState = STATE_ENABLED;
}
void InputTaskManager::FlushInputEventPrioritization() {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(mInputQueueState == STATE_ENABLED ||
mInputQueueState == STATE_SUSPEND);
mInputQueueState =
mInputQueueState == STATE_ENABLED ? STATE_FLUSHING : STATE_SUSPEND;
}
void InputTaskManager::SuspendInputEventPrioritization() {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(mInputQueueState == STATE_ENABLED ||
mInputQueueState == STATE_FLUSHING);
mInputQueueState = STATE_SUSPEND;
}
void InputTaskManager::ResumeInputEventPrioritization() {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(mInputQueueState == STATE_SUSPEND);
mInputQueueState = STATE_ENABLED;
}
int32_t InputTaskManager::GetPriorityModifierForEventLoopTurn(
const MutexAutoLock& aProofOfLock) {
// When the state is disabled, the input task that we have is
// very likely SuspendInputEventQueue, so here we also use
// normal priority as ResumeInputEventQueue, FlushInputEventQueue and
// SetInputEventQueueEnabled all uses normal priority, to
// ensure the ordering is correct.
if (State() == InputTaskManager::STATE_DISABLED) {
return static_cast<int32_t>(EventQueuePriority::Normal) -
static_cast<int32_t>(EventQueuePriority::InputHigh);
}
return GetPriorityModifierForEventLoopTurnForStrictVsyncAlignment();
}
void InputTaskManager::WillRunTask() {
TaskManager::WillRunTask();
mInputPriorityController.WillRunTask();
}
int32_t
InputTaskManager::GetPriorityModifierForEventLoopTurnForStrictVsyncAlignment() {
MOZ_ASSERT(!IsSuspended());
size_t inputCount = PendingTaskCount();
if (inputCount > 0 &&
mInputPriorityController.ShouldUseHighestPriority(this)) {
return static_cast<int32_t>(EventQueuePriority::InputHighest) -
static_cast<int32_t>(EventQueuePriority::InputHigh);
}
if (State() == STATE_FLUSHING ||
nsRefreshDriver::GetNextTickHint().isNothing()) {
return 0;
}
return static_cast<int32_t>(EventQueuePriority::InputLow) -
static_cast<int32_t>(EventQueuePriority::InputHigh);
}
InputTaskManager::InputPriorityController::InputPriorityController()
: mInputVsyncState(InputVsyncState::NoPendingVsync) {}
bool InputTaskManager::InputPriorityController::ShouldUseHighestPriority(
InputTaskManager* aInputTaskManager) {
if (mInputVsyncState == InputVsyncState::HasPendingVsync) {
return true;
}
if (mInputVsyncState == InputVsyncState::RunVsync) {
return false;
}
if (mInputVsyncState == InputVsyncState::NoPendingVsync &&
VsyncTaskManager::Get()->PendingTaskCount()) {
EnterPendingVsyncState(aInputTaskManager->PendingTaskCount());
return true;
}
return false;
}
void InputTaskManager::InputPriorityController::EnterPendingVsyncState(
uint32_t aNumPendingTasks) {
MOZ_ASSERT(mInputVsyncState == InputVsyncState::NoPendingVsync);
mInputVsyncState = InputVsyncState::HasPendingVsync;
mMaxInputTasksToRun = aNumPendingTasks;
mRunInputStartTime = TimeStamp::Now();
}
void InputTaskManager::InputPriorityController::WillRunVsync() {
if (mInputVsyncState == InputVsyncState::RunVsync ||
mInputVsyncState == InputVsyncState::HasPendingVsync) {
LeavePendingVsyncState(false);
}
}
void InputTaskManager::InputPriorityController::LeavePendingVsyncState(
bool aRunVsync) {
if (aRunVsync) {
MOZ_ASSERT(mInputVsyncState == InputVsyncState::HasPendingVsync);
mInputVsyncState = InputVsyncState::RunVsync;
} else {
mInputVsyncState = InputVsyncState::NoPendingVsync;
}
mMaxInputTasksToRun = 0;
}
void InputTaskManager::InputPriorityController::WillRunTask() {
switch (mInputVsyncState) {
case InputVsyncState::NoPendingVsync:
return;
case InputVsyncState::HasPendingVsync:
MOZ_ASSERT(mMaxInputTasksToRun > 0);
--mMaxInputTasksToRun;
if (!mMaxInputTasksToRun ||
TimeStamp::Now() - mRunInputStartTime >=
TimeDuration::FromMilliseconds(
StaticPrefs::dom_input_event_queue_duration_max())) {
LeavePendingVsyncState(true);
}
return;
default:
MOZ_DIAGNOSTIC_ASSERT(
false, "Shouldn't run this input task when we suppose to run vsync");
return;
}
}
// static
void InputTaskManager::Init() { gInputTaskManager = new InputTaskManager(); }
} // namespace mozilla
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