Calculates the line fragment rectangle and line fragment used rectangle for blank lines.
- macOS 10.4+
On return, the calculated line fragment rectangle.
On return, the used rectangle (the portion of the line fragment rectangle that actually contains marks).
The range of glyphs under consideration. A
paragraphwith length 0 indicates an extra line fragment (which occurs if the last character in the paragraph is a line separator).
Separator Glyph Range
The origin point of the line fragment rectangle.