If %NULL is supplied, the default font (i.e. the one being used for the
text) will be used instead.
@font_name should be a
string representation of a font description Pango can understand.
(e.g. "Monospace 10"). See [func@Pango.FontDescription.from_string]
for a description of the format of the string representation.
This function cannot be called anymore after the first call to the
[method@PrintCompositor.paginate] function.
Sets the font for printing the page header.
If %NULL is supplied, the default font (i.e. the one being used for the text) will be used instead.
@font_name should be a string representation of a font description Pango can understand. (e.g. "Monospace 10"). See [func@Pango.FontDescription.from_string] for a description of the format of the string representation.
This function cannot be called anymore after the first call to the [method@PrintCompositor.paginate] function.