Sets a default PangoCairoFontMap to use with Cairo.
This can be used to change the Cairo font backend that the
default fontmap uses for example. The old default font map
is unreffed and the new font map referenced.
A value of NULL for fontmap will cause the current default
font map to be released and a new default font
map to be created on demand, using pango_cairo_font_map_new().
Since 1.22
Sets a default PangoCairoFontMap to use with Cairo. This can be used to change the Cairo font backend that the default fontmap uses for example. The old default font map is unreffed and the new font map referenced. A value of NULL for fontmap will cause the current default font map to be released and a new default font map to be created on demand, using pango_cairo_font_map_new(). Since 1.22