Source for: fonts.py [raw]

 1import harfbuzz as hb
 2import freetype2 as ft
 3
 4
 5def adjust_widths_by_letter(boxes):
 6    """Takes a list of boxes as arguments, and uses harfbuzz to
 7    adjust the width of each box to match the harfbuzz text shaping."""
 8    buf = hb.Buffer.create()
 9    buf.add_str("".join(b.letter for b in boxes))
10    buf.guess_segment_properties()
11    font_lib = ft.get_default_lib()
12    face = font_lib.find_face("Arial")
13    face.set_char_size(size=1, resolution=64)
14    font = hb.Font.ft_create(face)
15    hb.shape(font, buf)
16    # at this point buf.glyph_positions has all the data we need
17    for box, position in zip(boxes, buf.glyph_positions):
18        box.w = position.x_advance
19