def glyph_metrics(string: str) -> Iterable[Metrics]:
font, upem, buffer = setup_harfbuzz()
HarfBuzz.buffer_clear_contents(buffer)
if False:
HarfBuzz.buffer_add_utf8(buffer, string.encode("utf-8"), 0, -1)
elif sys.maxunicode == 0x10FFFF:
HarfBuzz.buffer_add_utf32(
buffer,
array.array("I", string.encode("utf-32"))[1:], 0, -1)
else:
HarfBuzz.buffer_add_utf16(
buffer,
array.array("H", string.encode("utf-16"))[1:], 0, -1)
# If this doesn't get run, the Python interpreter crashes
HarfBuzz.buffer_guess_segment_properties(buffer)
HarfBuzz.shape(font, buffer, [])
codepoints = [
info.codepoint for info in HarfBuzz.buffer_get_glyph_infos(buffer)
]
positions = HarfBuzz.buffer_get_glyph_positions(buffer)
for extents, pos in zip(glyphs_extents(font, codepoints), positions):
yield Metrics(
Positions(pos.x_advance, pos.y_advance, pos.x_offset,
pos.y_offset),
extents,
upem,
)
def runHB(text, buf, font, ttfont):
HarfBuzz.buffer_clear_contents(buf)
HarfBuzz.buffer_add_utf8(buf, text.encode('utf-8'), 0, -1)
HarfBuzz.buffer_set_direction(buf, HarfBuzz.direction_t.RTL)
HarfBuzz.buffer_set_script(buf, HarfBuzz.script_t.ARABIC)
HarfBuzz.buffer_set_language(buf, HarfBuzz.language_from_string(b"ar"))
HarfBuzz.shape(font, buf, [])
info = HarfBuzz.buffer_get_glyph_infos(buf)
out = "|".join([ttfont.getGlyphName(i.codepoint) for i in info])
return "[%s]" % out
def runHB(text, buf, font, ttfont):
HarfBuzz.buffer_clear_contents(buf)
HarfBuzz.buffer_add_utf8(buf, text.encode('utf-8'), 0, -1)
HarfBuzz.buffer_set_direction(buf, HarfBuzz.direction_t.RTL)
HarfBuzz.buffer_set_script(buf, HarfBuzz.script_t.ARABIC)
HarfBuzz.buffer_set_language(buf, HarfBuzz.language_from_string(b"ar"))
HarfBuzz.shape(font, buf, [])
info = HarfBuzz.buffer_get_glyph_infos(buf)
positions = HarfBuzz.buffer_get_glyph_positions(buf)
out = []
for i, p in zip(info, positions):
text = ""
text += ttfont.getGlyphName(i.codepoint)
text += " w=%d" % p.x_advance
if p.x_offset:
text += " x=%d" % p.x_offset
if p.y_offset:
text += " y=%d" % p.y_offset
out.append(text)
return "[%s]" % "|".join(out)
