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 shape(self, text_="abvd", flag=False):
text = text_
# Need to create GLib.Bytes explicitly until this bug is fixed:
# https://bugzilla.gnome.org/show_bug.cgi?id=729541
buf = hb.buffer_create()
# class Debugger(object):
# def message(self, buf, font, msg, data, _x_what_is_this):
# print(msg)
# return True
# debugger = Debugger()
# hb.buffer_set_message_func (buf, debugger.message, 1, 0)
##
## Add text to buffer
##
#
# See https://github.com/harfbuzz/harfbuzz/pull/271
#
if flag:
# If you do not care about cluster values reflecting Python
# string indices, then this is quickest way to add text to
# buffer:
# void hb_buffer_add_utf8 (hb_buffer_t *buffer,
# const char *text,
# int text_length,
# unsigned int item_offset,
# int item_length);
hb.buffer_add_utf8(buf, text.encode('utf-8'), 0, -1)
# Otherwise, then following handles both narrow and wide
# Python builds:
elif sys.maxunicode == 0x10FFFF:
hb.buffer_add_utf32(buf, array.array('I', text.encode('utf-32le')),
0, -1)
else:
hb.buffer_add_utf16(buf, array.array('H', text.encode('utf-16le')),
0, -1)
hb.buffer_guess_segment_properties(buf)
hb.shape(self.__font, buf, [])
# del font
infos = hb.buffer_get_glyph_infos(buf)
# positions = hb.buffer_get_glyph_positions(buf)
return [info.codepoint for info in infos]
def get_text_shape(text, font=None, weight=None, path=None, debug=False):
if weight is not None:
font = f'{font}:{weight}'
if path is None:
path = get_font_path(font)
base, ext = os.path.splitext(path)
ext = ext[1:]
with open(path, 'rb') as fid:
fontdata = fid.read()
bdata = GLib.Bytes.new(fontdata)
blob = hb.glib_blob_create(bdata)
face = hb.face_create(blob, 0)
font = hb.font_create(face)
upem = hb.face_get_upem(face)
hb.font_set_scale(font, upem, upem)
# hb.font_set_ptem(font, font_size)
if ext == 'woff':
hb.ft_font_set_funcs(font)
buf = hb.buffer_create()
hb.buffer_add_utf8(buf, text.encode('utf-8'), 0, -1)
hb.buffer_guess_segment_properties(buf)
hb.shape(font, buf, [])
infos = hb.buffer_get_glyph_infos(buf)
positions = hb.buffer_get_glyph_positions(buf)
extents = [hb.font_get_glyph_extents(font, i.codepoint) for i in infos]
if debug:
return font, infos, positions, extents
norm = upem
wh_extract = lambda ext: (ext.extents.width / norm, -ext.extents.height /
norm)
cluster = [(i.codepoint, i.cluster) for i in infos]
shapes = [wh_extract(e) for e in extents]
deltas = [(p.x_advance / norm, p.y_advance / norm) for p in positions]
offsets = [(p.x_offset / norm, p.y_offset / norm) for p in positions]
return cluster, shapes, deltas, offsets
def main():
font_file = barcode_wheel.get_font_file()
font_blob = HarfBuzz.glib_blob_create(GLib.Bytes.new(font_file.read_bytes()))
face = HarfBuzz.face_create(font_blob, 0)
del font_blob
font = HarfBuzz.font_create(face)
upem = HarfBuzz.face_get_upem(face)
del face
HarfBuzz.font_set_scale(font, upem, upem)
text = sys.argv[1]
HarfBuzz.ot_font_set_funcs(font)
buf = HarfBuzz.buffer_create()
HarfBuzz.buffer_set_message_func(
buf,
# lambda *args: [print(x) for x in args] and True,
lambda *args: True,
1,
0,
)
if False:
HarfBuzz.buffer_add_utf8(buf, text.encode("utf-8"), 0, -1)
elif sys.maxunicode == 0x10FFFF:
HarfBuzz.buffer_add_utf32(
buf, array.array("I", text.encode("utf-32"))[1:], 0, -1
)
else:
HarfBuzz.buffer_add_utf16(
buf, array.array("H", text.encode("utf-16"))[1:], 0, -1
)
HarfBuzz.buffer_guess_segment_properties(buf)
HarfBuzz.shape(font, buf, [])
del font
infos = HarfBuzz.buffer_get_glyph_infos(buf)
positions = HarfBuzz.buffer_get_glyph_positions(buf)
for info, pos in zip(infos, positions):
gid = info.codepoint
cluster = info.cluster
print(f"gid {gid} = {cluster} @ {pos.x_advance}, {pos.x_offset}+{pos.y_offset}")
#
# See https://github.com/harfbuzz/harfbuzz/pull/271
#
if False:
# If you do not care about cluster values reflecting Python
# string indices, then this is quickest way to add text to
# buffer:
hb.buffer_add_utf8(buf, text.encode('utf-8'), 0, -1)
# Otherwise, then following handles both narrow and wide
# Python builds:
elif sys.maxunicode == 0x10FFFF:
hb.buffer_add_utf32(buf, array.array('I', text.encode('utf-32')), 0, -1)
else:
hb.buffer_add_utf16(buf, array.array('H', text.encode('utf-16')), 0, -1)
hb.buffer_guess_segment_properties(buf)
hb.shape(font, buf, [])
del font
infos = hb.buffer_get_glyph_infos(buf)
positions = hb.buffer_get_glyph_positions(buf)
for info, pos in zip(infos, positions):
gid = info.codepoint
cluster = info.cluster
x_advance = pos.x_advance
x_offset = pos.x_offset
y_offset = pos.y_offset
print("gid%d=%d@%d,%d+%d" % (gid, cluster, x_advance, x_offset, y_offset))
# See https://github.com/harfbuzz/harfbuzz/pull/271
#
if False:
# If you do not care about cluster values reflecting Python
# string indices, then this is quickest way to add text to
# buffer:
hb.buffer_add_utf8 (buf, text.encode('utf-8'), 0, -1)
# Otherwise, then following handles both narrow and wide
# Python builds:
elif sys.maxunicode == 0x10FFFF:
hb.buffer_add_utf32 (buf, array.array('I', text.encode('utf-32')), 0, -1)
else:
hb.buffer_add_utf16 (buf, array.array('H', text.encode('utf-16')), 0, -1)
hb.buffer_guess_segment_properties (buf)
hb.shape (font, buf, [])
del font
infos = hb.buffer_get_glyph_infos (buf)
positions = hb.buffer_get_glyph_positions (buf)
for info,pos in zip(infos, positions):
gid = info.codepoint
cluster = info.cluster
x_advance = pos.x_advance
x_offset = pos.x_offset
y_offset = pos.y_offset
print("gid%d=%d@%d,%d+%d" % (gid, cluster, x_advance, x_offset, y_offset))
