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#!/usr/bin/env python3
import sys
import array
from gi.repository import HarfBuzz as hb
from gi.repository import GLib
fontdata = open (sys.argv[1], 'rb').read ()
text = 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 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 (the first item in the array is BOM, so we skip it):
if sys.maxunicode == 0x10FFFF:
hb.buffer_add_utf32 (buf, array.array ('I', text.encode ('utf-32'))[1:], 0, -1)
else:
hb.buffer_add_utf16 (buf, array.array ('H', text.encode ('utf-16'))[1:], 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))
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