pango:font-map-load-fontset (fontmap context desc language)

fontmap -- a pango:font-map object
context -- a pango:context object the font will be used with
desc -- a pango:font-description instance describing the font to load
language -- a pango:language instance the fonts will be used for

The newly allocated pango:fontset object loaded, or nil if no font matched.

Load a set of fonts in the fontmap that can be used to render a font matching desc.