def to_glyphs_font_attributes(self, source, master, is_initial):
if is_initial:<EOL><INDENT>_set_glyphs_font_attributes(self, source)<EOL><DEDENT>else:<EOL><INDENT>_compare_and_merge_glyphs_font_attributes(self, source)<EOL><DEDENT>
Copy font attributes from `ufo` either to `self.font` or to `master`.

Arguments:
self -- The UFOBuilder
ufo -- The current UFO being read
master -- The current master being written
is_initial -- True iff this the first UFO that we process