A path of a TrueType font file (.ttf)
if this parameter is true, the glyph data of the font is embedded, otherwise only the matrix data is included in PDF file
the index of font to be loaded.
when loadTTFontFromFile() succeeds, it returns the name of a font. Otherwise, it returns null and error-handler is called
Loads a TrueType font from an external file (at the selected index) and register it to a document object