|
calibre's font subsetting code actually reads the gsub table in a font and includes all ligature combinations of the subset glyphs. The test file you attached has no f based words and no embedded fonts.
And converting a text file with the sentence When Rand and Mat carried the first in it with the embedded font Calibri (which has a fi ligature) results in the same rendering with and without subsetting in the calibre viewer.
EDIT: Nevermind, I see that I downloaded an incorrect file, I'll look at your file in a bit
|