зеркало из https://github.com/mozilla/gecko-dev.git
135 строки
4.1 KiB
C++
135 строки
4.1 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#include "SoftwareVsyncSource.h"
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#include "base/task.h"
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#include "gfxPlatform.h"
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#include "nsThreadUtils.h"
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using namespace mozilla;
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SoftwareVsyncSource::SoftwareVsyncSource() {
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MOZ_ASSERT(NS_IsMainThread());
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mGlobalDisplay = new SoftwareDisplay();
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}
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SoftwareVsyncSource::~SoftwareVsyncSource() {
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MOZ_ASSERT(NS_IsMainThread());
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mGlobalDisplay = nullptr;
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}
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SoftwareDisplay::SoftwareDisplay() : mVsyncEnabled(false) {
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// Mimic 60 fps
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MOZ_ASSERT(NS_IsMainThread());
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const double rate = 1000.0 / (double)gfxPlatform::GetSoftwareVsyncRate();
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mVsyncRate = mozilla::TimeDuration::FromMilliseconds(rate);
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mVsyncThread = new base::Thread("SoftwareVsyncThread");
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MOZ_RELEASE_ASSERT(mVsyncThread->Start(),
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"GFX: Could not start software vsync thread");
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}
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SoftwareDisplay::~SoftwareDisplay() = default;
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void SoftwareDisplay::EnableVsync() {
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MOZ_ASSERT(mVsyncThread->IsRunning());
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if (NS_IsMainThread()) {
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if (mVsyncEnabled) {
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return;
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}
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mVsyncEnabled = true;
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mVsyncThread->message_loop()->PostTask(NewRunnableMethod(
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"SoftwareDisplay::EnableVsync", this, &SoftwareDisplay::EnableVsync));
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return;
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}
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MOZ_ASSERT(IsInSoftwareVsyncThread());
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TimeStamp vsyncTime = TimeStamp::Now();
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TimeStamp outputTime = vsyncTime + mVsyncRate;
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NotifyVsync(vsyncTime, outputTime);
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}
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void SoftwareDisplay::DisableVsync() {
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MOZ_ASSERT(mVsyncThread->IsRunning());
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if (NS_IsMainThread()) {
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if (!mVsyncEnabled) {
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return;
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}
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mVsyncEnabled = false;
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mVsyncThread->message_loop()->PostTask(NewRunnableMethod(
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"SoftwareDisplay::DisableVsync", this, &SoftwareDisplay::DisableVsync));
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return;
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}
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MOZ_ASSERT(IsInSoftwareVsyncThread());
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if (mCurrentVsyncTask) {
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mCurrentVsyncTask->Cancel();
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mCurrentVsyncTask = nullptr;
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}
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}
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bool SoftwareDisplay::IsVsyncEnabled() {
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MOZ_ASSERT(NS_IsMainThread());
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return mVsyncEnabled;
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}
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bool SoftwareDisplay::IsInSoftwareVsyncThread() {
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return mVsyncThread->thread_id() == PlatformThread::CurrentId();
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}
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void SoftwareDisplay::NotifyVsync(const mozilla::TimeStamp& aVsyncTimestamp,
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const mozilla::TimeStamp& aOutputTimestamp) {
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MOZ_ASSERT(IsInSoftwareVsyncThread());
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mozilla::TimeStamp displayVsyncTime = aVsyncTimestamp;
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mozilla::TimeStamp now = mozilla::TimeStamp::Now();
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// Posted tasks can only have integer millisecond delays
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// whereas TimeDurations can have floating point delays.
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// Thus the vsync timestamp can be in the future, which large parts
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// of the system can't handle, including animations. Force the timestamp to be
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// now.
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if (aVsyncTimestamp > now) {
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displayVsyncTime = now;
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}
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Display::NotifyVsync(displayVsyncTime, aOutputTimestamp);
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// Prevent skew by still scheduling based on the original
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// vsync timestamp
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ScheduleNextVsync(aVsyncTimestamp);
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}
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mozilla::TimeDuration SoftwareDisplay::GetVsyncRate() { return mVsyncRate; }
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void SoftwareDisplay::ScheduleNextVsync(mozilla::TimeStamp aVsyncTimestamp) {
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MOZ_ASSERT(IsInSoftwareVsyncThread());
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mozilla::TimeStamp nextVsync = aVsyncTimestamp + mVsyncRate;
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mozilla::TimeDuration delay = nextVsync - mozilla::TimeStamp::Now();
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if (delay.ToMilliseconds() < 0) {
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delay = mozilla::TimeDuration::FromMilliseconds(0);
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nextVsync = mozilla::TimeStamp::Now();
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}
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TimeStamp outputTime = nextVsync + mVsyncRate;
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mCurrentVsyncTask =
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NewCancelableRunnableMethod<mozilla::TimeStamp, mozilla::TimeStamp>(
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"SoftwareDisplay::NotifyVsync", this, &SoftwareDisplay::NotifyVsync,
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nextVsync, outputTime);
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RefPtr<Runnable> addrefedTask = mCurrentVsyncTask;
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mVsyncThread->message_loop()->PostDelayedTask(addrefedTask.forget(),
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delay.ToMilliseconds());
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}
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void SoftwareDisplay::Shutdown() {
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MOZ_ASSERT(NS_IsMainThread());
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DisableVsync();
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mVsyncThread->Stop();
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delete mVsyncThread;
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}
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