def dump_closure_map(fontfile, outputfolder):
"""Takes closure of each glyph in the font and dump them into the two seperate files.
Index file used to locate a glyph in data file.
Data file contains closure lists
"""
font = TTFont(fontfile)
closurer = ClosureTaker(font)
glyph_metadata = Dumper(outputfolder + '/closure_idx')
glyph_data = Dumper(outputfolder + '/closure_data')
bigEndian = '>'
fmt_offset = '>l' # offset - length
fmt_size = '>H'
fmt_elem = 'H'
elem_size = struct.calcsize(fmt_elem)
offset = 0
for g in font.getGlyphOrder():
closurer.clear()
closurer.add_glyph_names([g])
glyphsClosure = closurer.closure()
id = closurer.glyph_name_to_id[g]
if len(glyphsClosure) == 1 and id in glyphsClosure:
# recording not needed
glyph_metadata.dump_fmt(-1, fmt_offset)
glyph_metadata.dump_fmt(0, fmt_size)
else:
size = elem_size * len(glyphsClosure)
glyph_data.dump_array(glyphsClosure, fmt_elem, bigEndian)
glyph_metadata.dump_fmt(offset, fmt_offset)
glyph_metadata.dump_fmt(size, fmt_size)
#print id, g, glyphsClosure
offset += size
font.close()
glyph_data.close()
glyph_metadata.close()
def setUp(self):
"""Loads font and initializes ClosureTaker
"""
self.font = TTFont('test_data/NotoSans-Regular_subset.ttf')
self.closureTaker = ClosureTaker(self.font)
