the text corresponding to the glyphs
the length of @text, in bytes
the embedding level of the string
an array whose length is the number of characters in text (equal to g_utf8_strlen (text, length) unless text has NUL bytes) to be filled in with the resulting character widths.
Given a PangoGlyphString and corresponding text, determine the width corresponding to each character.
When multiple characters compose a single cluster, the width of the entire cluster is divided equally among the characters.
See also [method@Pango.GlyphItem.get_logical_widths].