78 lines
1.9 KiB
C++
78 lines
1.9 KiB
C++
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/*
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SPDX-FileCopyrightText: 2020 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
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SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "fbvsyncmonitor.h"
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#include <QThread>
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#include <linux/fb.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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namespace KWin
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{
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FramebufferVsyncMonitorHelper::FramebufferVsyncMonitorHelper(int fileDescriptor, QObject *parent)
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: QObject(parent)
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, m_fileDescriptor(fileDescriptor)
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{
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}
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FramebufferVsyncMonitorHelper::~FramebufferVsyncMonitorHelper()
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{
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close(m_fileDescriptor);
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}
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void FramebufferVsyncMonitorHelper::poll()
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{
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if (ioctl(m_fileDescriptor, FBIO_WAITFORVSYNC)) {
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emit errorOccurred();
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} else {
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emit vblankOccurred(std::chrono::steady_clock::now().time_since_epoch());
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}
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}
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FramebufferVsyncMonitor::FramebufferVsyncMonitor(int fileDescriptor, QObject *parent)
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: VsyncMonitor(parent)
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, m_thread(new QThread)
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, m_helper(new FramebufferVsyncMonitorHelper(fileDescriptor))
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{
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m_helper->moveToThread(m_thread);
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connect(m_helper, &FramebufferVsyncMonitorHelper::errorOccurred,
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this, &FramebufferVsyncMonitor::errorOccurred);
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connect(m_helper, &FramebufferVsyncMonitorHelper::vblankOccurred,
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this, &FramebufferVsyncMonitor::vblankOccurred);
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m_thread->setObjectName(QStringLiteral("vsync event monitor"));
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m_thread->start();
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}
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FramebufferVsyncMonitor::~FramebufferVsyncMonitor()
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{
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m_thread->quit();
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m_thread->wait();
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delete m_helper;
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delete m_thread;
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}
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void FramebufferVsyncMonitor::arm()
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{
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QMetaObject::invokeMethod(m_helper, &FramebufferVsyncMonitorHelper::poll);
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}
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FramebufferVsyncMonitor *FramebufferVsyncMonitor::create(int fileDescriptor, QObject *parent)
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{
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const int threadFileDescriptor = dup(fileDescriptor);
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if (threadFileDescriptor == -1) {
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return nullptr;
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}
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return new FramebufferVsyncMonitor(threadFileDescriptor, parent);
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}
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} // namespace KWin
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