How QML determines default font.pixelSize

SeeLook

Hi.

I'm trying to figure out how QML determines font.pixelSize, because it is not simply FontMetrics.height (or qApp->fontMetrics().height())
I. e. for system font size set to 12:
qApp->font().pointSize() is exactly 12 the same as QML font.pointSize
qApp->fontMetrics().height() is 19 (the same as QML FontMetrics)
but
qApp->font().pixelSize() is -1 mens undefined
whereas QML font.pixelSize is 16
So how to obtain this last value, knowing system font size (pointSize) before QML will be initialized?

SeeLook

OK. I've got it....

auto pixelSize = qApp.font().pointSizeF() / 72.0 * qApp->primaryScreen()->logicalDotsPerInch();