1#!/usr/bin/env python3
2
3import sys
4import array
5from gi.repository import HarfBuzz as hb
6from gi.repository import GLib
7
8fontdata = open (sys.argv[1], 'rb').read ()
9text = sys.argv[2]
10# Need to create GLib.Bytes explicitly until this bug is fixed:
11# https://bugzilla.gnome.org/show_bug.cgi?id=729541
12blob = hb.glib_blob_create (GLib.Bytes.new (fontdata))
13face = hb.face_create (blob, 0)
14del blob
15font = hb.font_create (face)
16upem = hb.face_get_upem (face)
17del face
18hb.font_set_scale (font, upem, upem)
19#hb.ft_font_set_funcs (font)
20hb.ot_font_set_funcs (font)
21
22buf = hb.buffer_create ()
23class Debugger (object):
24	def message (self, buf, font, msg, data, _x_what_is_this):
25		print (msg)
26		return True
27debugger = Debugger ()
28hb.buffer_set_message_func (buf, debugger.message, 1, 0)
29
30##
31## Add text to buffer
32##
33#
34# See https://github.com/harfbuzz/harfbuzz/pull/271
35#
36# If you do not care about cluster values reflecting Python
37# string indices, then this is quickest way to add text to
38# buffer:
39# hb.buffer_add_utf8 (buf, text.encode('utf-8'), 0, -1)
40# Otherwise, then following handles both narrow and wide
41# Python builds (the first item in the array is BOM, so we skip it):
42if sys.maxunicode == 0x10FFFF:
43	hb.buffer_add_utf32 (buf, array.array ('I', text.encode ('utf-32'))[1:], 0, -1)
44else:
45	hb.buffer_add_utf16 (buf, array.array ('H', text.encode ('utf-16'))[1:], 0, -1)
46
47
48hb.buffer_guess_segment_properties (buf)
49
50hb.shape (font, buf, [])
51del font
52
53infos = hb.buffer_get_glyph_infos (buf)
54positions = hb.buffer_get_glyph_positions (buf)
55
56for info, pos in zip (infos, positions):
57	gid = info.codepoint
58	cluster = info.cluster
59	x_advance = pos.x_advance
60	x_offset = pos.x_offset
61	y_offset = pos.y_offset
62
63	print ("gid%d=%d@%d,%d+%d" % (gid, cluster, x_advance, x_offset, y_offset))
64