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      1 #!/usr/bin/python
      2 # -*- coding: utf-8 -*-
      3 
      4 from __future__ import print_function
      5 import sys
      6 import array
      7 from gi.repository import HarfBuzz as hb
      8 from gi.repository import GLib
      9 
     10 # Python 2/3 compatibility
     11 try:
     12 	unicode
     13 except NameError:
     14 	unicode = str
     15 
     16 def tounicode(s, encoding='utf-8'):
     17 	if not isinstance(s, unicode):
     18 		return s.decode(encoding)
     19 	else:
     20 		return s
     21 
     22 fontdata = open (sys.argv[1], 'rb').read ()
     23 text = tounicode(sys.argv[2])
     24 # Need to create GLib.Bytes explicitly until this bug is fixed:
     25 # https://bugzilla.gnome.org/show_bug.cgi?id=729541
     26 blob = hb.glib_blob_create (GLib.Bytes.new (fontdata))
     27 face = hb.face_create (blob, 0)
     28 del blob
     29 font = hb.font_create (face)
     30 upem = hb.face_get_upem (face)
     31 del face
     32 hb.font_set_scale (font, upem, upem)
     33 #hb.ft_font_set_funcs (font)
     34 hb.ot_font_set_funcs (font)
     35 
     36 buf = hb.buffer_create ()
     37 class Debugger(object):
     38 	def message (self, buf, font, msg, data, _x_what_is_this):
     39 		print(msg)
     40 		return True
     41 debugger = Debugger()
     42 hb.buffer_set_message_func (buf, debugger.message, 1, 0)
     43 
     44 ##
     45 ## Add text to buffer
     46 ##
     47 #
     48 # See https://github.com/behdad/harfbuzz/pull/271
     49 #
     50 if False:
     51 	# If you do not care about cluster values reflecting Python
     52 	# string indices, then this is quickest way to add text to
     53 	# buffer:
     54 	hb.buffer_add_utf8 (buf, text.encode('utf-8'), 0, -1)
     55 	# Otherwise, then following handles both narrow and wide
     56 	# Python builds:
     57 elif sys.maxunicode == 0x10FFFF:
     58 	hb.buffer_add_utf32 (buf, array.array('I', text.encode('utf-32')), 0, -1)
     59 else:
     60 	hb.buffer_add_utf16 (buf, array.array('H', text.encode('utf-16')), 0, -1)
     61 
     62 
     63 hb.buffer_guess_segment_properties (buf)
     64 
     65 hb.shape (font, buf, [])
     66 del font
     67 
     68 infos = hb.buffer_get_glyph_infos (buf)
     69 positions = hb.buffer_get_glyph_positions (buf)
     70 
     71 for info,pos in zip(infos, positions):
     72 	gid = info.codepoint
     73 	cluster = info.cluster
     74 	x_advance = pos.x_advance
     75 	x_offset = pos.x_offset
     76 	y_offset = pos.y_offset
     77 
     78 	print("gid%d=%d@%d,%d+%d" % (gid, cluster, x_advance, x_offset, y_offset))
     79