This is a temporary solution to fix the assertion on empty line drawing until after bug 128009 is landed.
Committed r163264: <http://trac.webkit.org/changeset/163264>
On a float it should be floorf. Calling floor will convert to a double, then floor, and then convert back to a float.
(In reply to comment #2) > On a float it should be floorf. Calling floor will convert to a double, then floor, and then convert back to a float. hmm, how did I miss that! Thanks. I am planning to land the proper fix for this later today.