Method updateImage

src/frontend/matrix/MatrixView.cpp:819–869

};

void MatrixView::updateImage() {
#ifndef SDK
	WAIT_CURSOR;
	m_image = QImage(m_matrix->columnCount(), m_matrix->rowCount(), QImage::Format_ARGB32);

	// find min/max value
	double dmax = -DBL_MAX, dmin = DBL_MAX;
	const auto* data = static_cast<QVector<QVector<double>>*>(m_matrix->data());
	const int width = m_matrix->columnCount();
	const int height = m_matrix->rowCount();
	for (int col = 0; col < width; ++col) {
		for (int row = 0; row < height; ++row) {
			const double value = (data->operator[](col))[row];
			if (dmax < value)
				dmax = value;
			if (dmin > value)
				dmin = value;
		}
	}

	// update the image
	auto* manager = ColorMapsManager::instance();
	QPixmap pix;
	manager->render(pix, QLatin1String("viridis100")); // dummy render to get the color vector initialized
	const auto& colors = manager->colors();
	auto* pool = QThreadPool::globalInstance();
	int range = ceil(double(m_image.height()) / pool->maxThreadCount());
	for (int i = 0; i < pool->maxThreadCount(); ++i) {
		const int start = i * range;
		int end = (i + 1) * range;
		if (end > m_image.height())
			end = m_image.height();
		auto* task = new UpdateImageTask(start, end, m_image, data, dmin, dmax, colors);
		pool->start(task);
	}
	pool->waitForDone();

	if (m_zoomFactor == 1.) {
		m_imageLabel->resize(width, height);
		m_imageLabel->setPixmap(QPixmap::fromImage(m_image));
	} else {
		const int w = static_cast<int>(std::rint(m_image.width() * m_zoomFactor));
		const int h = static_cast<int>(std::rint(m_image.height() * m_zoomFactor));
		m_imageLabel->resize(w, h);
		QImage zoomedImage = m_image.scaled(w, h);
		m_imageLabel->setPixmap(QPixmap::fromImage(zoomedImage));
	}
	m_imageIsDirty = false;
	RESET_CURSOR;
#endif
}

// ############################# matrix related slots ###########################
void MatrixView::switchView(QAction* action) {