Convert the characters in item into glyphs.
This is similar to [func@Pango.shape_with_flags], except it takes a `PangoItem` instead of separate item_text and
analysis arguments.
It also takes log_attrs, which are needed for implementing some aspects of hyphen insertion and text transforms (in
particular, capitalization).
Note that the extra attributes in the analyis that is returned from [func@Pango.itemize] have indices that are relative to
the entire paragraph, so you do not pass the full paragraph text as paragraph_text, you need to subtract the item offset from
their indices before calling [func@Pango.shape_with_flags].
| item |
`PangoItem` to shape |
| paragraph_text |
text of the paragraph (see details). |
| paragraph_length |
the length (in bytes) of |
| log_attrs |
array of `PangoLogAttr` for |
| glyphs |
glyph string in which to store results |
| flags |
flags influencing the shaping process |