Gets the current run. When iterating by run, at the end of each
line, there's a position with a NULL run, so this function can return
NULL. The NULL run at the end of each line ensures that all lines have
at least one run, even lines consisting of only a newline.
This is a faster alternative to Layout.iterGetRun,
but the user is not expected
to modify the contents of the run (glyphs, glyph widths, etc.).
Gets the current run. When iterating by run, at the end of each line, there's a position with a NULL run, so this function can return NULL. The NULL run at the end of each line ensures that all lines have at least one run, even lines consisting of only a newline.
This is a faster alternative to Layout.iterGetRun, but the user is not expected to modify the contents of the run (glyphs, glyph widths, etc.).