a PangoFont
rectangle used to store the extents of the glyph string as drawn or NULL to indicate that the result is not needed. out[allow-none]
rectangle used to store the logical extents of the glyph string or NULL to indicate that the result is not needed. out[allow-none]
Compute the logical and ink extents of a glyph string. See the documentation for pango_font_get_glyph_extents() for details about the interpretation of the rectangles.