def setup_harfbuzz() -> Tuple[HarfBuzz.font_t, HarfBuzz.buffer_t]:
"""
Finds a font for HarfBuzz to use, and creates a buffer
Because this is wrapped with functools.lru_cache, the buffer returned
may have text still in it, which means
gi.repository.HarfBuzz.buffer_clear_contents()
will need to be called on the buffer to return it to its empty state
"""
font_file = 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, 100, 100)
HarfBuzz.ot_font_set_funcs(font)
buffer = HarfBuzz.buffer_create()
# HarfBuzz.buffer_set_message_func(
# buffer,
# lambda *args: True,
# 1,
# 0,
# )
return (font, upem, buffer)
def runHB(direction, script, language, features, text, fontname, positions):
font = getHbFont(fontname)
buf = HarfBuzz.buffer_create()
text = toUnicode(text)
HarfBuzz.buffer_add_utf8(buf, text.encode('utf-8'), 0, -1)
HarfBuzz.buffer_set_direction(buf, HarfBuzz.direction_from_string(toBytes(direction)))
HarfBuzz.buffer_set_script(buf, HarfBuzz.script_from_string(toBytes(script)))
if language:
HarfBuzz.buffer_set_language(buf, HarfBuzz.language_from_string(toBytes(language)))
if features:
features = [HarfBuzz.feature_from_string(toBytes(fea))[1] for fea in features.split(',')]
else:
features = []
HarfBuzz.shape(font, buf, features)
info = HarfBuzz.buffer_get_glyph_infos(buf)
ttfont = getTtFont(fontname)
if positions:
pos = HarfBuzz.buffer_get_glyph_positions(buf)
glyphs = []
for i, p in zip(info, pos):
glyph = ttfont.getGlyphName(i.codepoint)
if p.x_offset or p.y_offset:
glyph += "@%d,%d" % (p.x_offset, p.y_offset)
glyph += "+%d" % p.x_advance
if p.y_advance:
glyph += ",%d" % p.y_advance
glyphs.append(glyph)
out = "|".join(glyphs)
else:
out = "|".join([ttfont.getGlyphName(i.codepoint) for i in info])
return "[%s]" % out
def runTest(tests, refs, fontname):
failed = {}
passed = []
font = getHbFont(fontname)
buf = HarfBuzz.buffer_create()
ttfont = TTFont(fontname)
for i, (text, ref) in enumerate(zip(tests, refs)):
result = runHB(text, buf, font, ttfont)
if ref == result:
passed.append(i + 1)
else:
failed[i + 1] = (text, ref, result)
return passed, failed
def runTest(tests, refs, fontname):
failed = {}
passed = []
font = getHbFont(fontname)
buf = HarfBuzz.buffer_create()
ttfont = TTFont(fontname)
for i, (text, ref) in enumerate(zip(tests, refs)):
result = runHB(text, buf, font, ttfont)
if ref == result:
passed.append(i + 1)
else:
failed[i + 1] = (text, ref, result)
return passed, failed
def shape(text, font):
text = toUnicode(text)
buf = HarfBuzz.buffer_create()
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("ar"))
HarfBuzz.shape(font, buf, [HarfBuzz.feature_from_string("+ss01")[1]])
glyphs = HarfBuzz.buffer_get_glyph_infos(buf)
positions = HarfBuzz.buffer_get_glyph_positions(buf)
return [(g.codepoint, p.x_advance, p.x_offset, p.y_offset) for g, p in zip(glyphs, positions)]
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 shape(text, font):
text = toUnicode(text)
buf = HarfBuzz.buffer_create()
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("ar"))
HarfBuzz.shape(font, buf, [HarfBuzz.feature_from_string("+ss01")[1]])
glyphs = HarfBuzz.buffer_get_glyph_infos(buf)
positions = HarfBuzz.buffer_get_glyph_positions(buf)
return [(g.codepoint, p.x_advance, p.x_offset, p.y_offset)
for g, p in zip(glyphs, positions)]
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}")
fontdata = open(sys.argv[1], 'rb').read()
text = tounicode(sys.argv[2])
# Need to create GLib.Bytes explicitly until this bug is fixed:
# https://bugzilla.gnome.org/show_bug.cgi?id=729541
blob = hb.glib_blob_create(GLib.Bytes.new(fontdata))
face = hb.face_create(blob, 0)
del blob
font = hb.font_create(face)
upem = hb.face_get_upem(face)
del face
hb.font_set_scale(font, upem, upem)
#hb.ft_font_set_funcs (font)
hb.ot_font_set_funcs(font)
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
##
#
fontdata = open (sys.argv[1], 'rb').read () text = tounicode(sys.argv[2]) # Need to create GLib.Bytes explicitly until this bug is fixed: # https://bugzilla.gnome.org/show_bug.cgi?id=729541 blob = hb.glib_blob_create (GLib.Bytes.new (fontdata)) face = hb.face_create (blob, 0) del blob font = hb.font_create (face) upem = hb.face_get_upem (face) del face hb.font_set_scale (font, upem, upem) #hb.ft_font_set_funcs (font) hb.ot_font_set_funcs (font) 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 False: # If you do not care about cluster values reflecting Python
