Method refresh

gui/qt/lcdwidget.cpp:179–189

}

double LCDWidget::refresh() {
    std::chrono::steady_clock::time_point timeNFramesAgo = m_perfArray[m_perfIndex];
    m_perfArray[m_perfIndex] = std::chrono::steady_clock::now();
    std::chrono::duration<double> diff = m_perfArray[m_perfIndex] - timeNFramesAgo;
    double guiFrameTime = diff.count() / PerfArraySize;
    if (++m_perfIndex == PerfArraySize) {
        m_perfIndex = 0;
    }
    update();
    return guiFrameTime;
}

void LCDWidget::setMain() {
    m_mutex.lock();