get_unknown_glyphs_count

Description:

[ Version ( since = "1.16" ) ]
public int get_unknown_glyphs_count ()

Counts the number of unknown glyphs in this.

This function can be used to determine if there are any fonts available to render all characters in a certain string, or when used in combination with pango_attr_fallback, to check if a certain font supports all the characters in the string.

Parameters:

this	a `PangoLayout`

Returns:

The number of unknown glyphs in this