QFontMetricsF::horizontalAdvance returns negative value with high font dpi due to integer overflow

#include <QtGui>

int main(int argc, char **argv)
{
	QGuiApplication app(argc, argv);

	QImage img(1, 1, QImage::Format_ARGB32);
	img.setDotsPerMeterX(56692);
	img.setDotsPerMeterY(56692);

	QFont font(QFont("SimSun", 36), &img);

	QFontMetrics fm(font);
#if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
	qDebug() << "fontDpi: " << fm.fontDpi();
#endif
	qDebug() << "width: " << fm.horizontalAdvance(QChar(L'，'));

	return 0;
}

g = new Glyph;
g->data = nullptr;
g->linearAdvance = info.linearAdvance;