pango:font-description-gravity (desc)

desc -- a pango:font-description instance
gravity -- a pango:gravity value for the gravity for the font description

Gets or sets the gravity field of a font description. The gravity field specifies how the glyphs should be rotated. If gravity is :auto, this actually unsets the gravity mask on the font description.

This function is seldom useful to the user. Gravity should normally be set on a pango:context object.