kc3-lang/harfbuzz/src/sample.py

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• Author : Behdad Esfahbod
  Date : 2022-11-15 15:52:04
  Hash : 6df8498d
  Message : [sample.py] Fix warning

• src/sample.py

• #!/usr/bin/env python3
  
  import sys
  import array
  import gi
  gi.require_version('HarfBuzz', '0.0')
  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))