sample.py (1832B)
1 #!/usr/bin/env python3 2 3 import sys 4 import array 5 import gi 6 gi.require_version('HarfBuzz', '0.0') 7 from gi.repository import HarfBuzz as hb 8 from gi.repository import GLib 9 10 fontdata = open (sys.argv[1], 'rb').read () 11 text = sys.argv[2] 12 # Need to create GLib.Bytes explicitly until this bug is fixed: 13 # https://bugzilla.gnome.org/show_bug.cgi?id=729541 14 blob = hb.glib_blob_create (GLib.Bytes.new (fontdata)) 15 face = hb.face_create (blob, 0) 16 del blob 17 font = hb.font_create (face) 18 upem = hb.face_get_upem (face) 19 del face 20 hb.font_set_scale (font, upem, upem) 21 #hb.ft_font_set_funcs (font) 22 hb.ot_font_set_funcs (font) 23 24 buf = hb.buffer_create () 25 class Debugger (object): 26 def message (self, buf, font, msg, data, _x_what_is_this): 27 print (msg) 28 return True 29 debugger = Debugger () 30 hb.buffer_set_message_func (buf, debugger.message, 1, 0) 31 32 ## 33 ## Add text to buffer 34 ## 35 # 36 # See https://github.com/harfbuzz/harfbuzz/pull/271 37 # 38 # If you do not care about cluster values reflecting Python 39 # string indices, then this is quickest way to add text to 40 # buffer: 41 # hb.buffer_add_utf8 (buf, text.encode('utf-8'), 0, -1) 42 # Otherwise, then following handles both narrow and wide 43 # Python builds (the first item in the array is BOM, so we skip it): 44 if sys.maxunicode == 0x10FFFF: 45 hb.buffer_add_utf32 (buf, array.array ('I', text.encode ('utf-32'))[1:], 0, -1) 46 else: 47 hb.buffer_add_utf16 (buf, array.array ('H', text.encode ('utf-16'))[1:], 0, -1) 48 49 50 hb.buffer_guess_segment_properties (buf) 51 52 hb.shape (font, buf, []) 53 del font 54 55 infos = hb.buffer_get_glyph_infos (buf) 56 positions = hb.buffer_get_glyph_positions (buf) 57 58 for info, pos in zip (infos, positions): 59 gid = info.codepoint 60 cluster = info.cluster 61 x_advance = pos.x_advance 62 x_offset = pos.x_offset 63 y_offset = pos.y_offset 64 65 print ("gid%d=%d@%d,%d+%d" % (gid, cluster, x_advance, x_offset, y_offset))