Method updateData

app/src/UI/Widgets/FFTPlot.cpp:372–410

* @brief Updates the FFT data. */

 * @brief Updates the FFT data.
 */
void Widgets::FFTPlot::updateData()
{
  static thread_local DSP::DownsampleWorkspace ws;

  if (!isEnabled())
    return;

  if (!VALIDATE_WIDGET(SerialStudio::DashboardFFT, m_index))
    return;

  const auto& data  = UI::Dashboard::instance().fftData(m_index);
  const int newSize = static_cast<int>(data.size());
  if (newSize != m_size && !rebuildFftPlan(newSize))
    return;

  if (newSize <= 0)
    return;

  if (!m_plan)
    return;

  const double* in       = data.raw();
  std::size_t idx        = data.frontIndex();
  const std::size_t mask = data.storageMask();
  const double offset    = m_scaleIsValid ? -m_center : 0.0;
  const double scale     = m_scaleIsValid ? (1.0 / m_halfRange) : 1.0;
  for (int i = 0; i < m_size; ++i) {
    const double raw = in[idx];
    const float v    = std::isfinite(raw) ? static_cast<float>((raw + offset) * scale) : 0.0f;
    m_samples[i].r   = v * m_window[i];
    m_samples[i].i   = 0.0f;
    idx              = (idx + 1) & mask;
  }

  kiss_fft(m_plan, m_samples.data(), m_fftOutput.data());
  const int spectrumSize = static_cast<size_t>(m_size) / 2;
  computeSmoothedSpectrum(spectrumSize);
  DSP::downsampleMonotonic(m_xData, m_yData, m_dataW, m_dataH, m_data, &ws);
}

/**
 * @brief Rebuilds the render data for ZOH or stem interpolation modes.