HarfBuzz text shaping engine
http://harfbuzz.github.io/
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65 lines
1.8 KiB
65 lines
1.8 KiB
#!/usr/bin/env python3 |
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import sys |
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import array |
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import gi |
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gi.require_version('HarfBuzz', '0.0') |
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from gi.repository import HarfBuzz as hb |
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from gi.repository import GLib |
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fontdata = open (sys.argv[1], 'rb').read () |
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text = sys.argv[2] |
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# Need to create GLib.Bytes explicitly until this bug is fixed: |
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# https://bugzilla.gnome.org/show_bug.cgi?id=729541 |
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blob = hb.glib_blob_create (GLib.Bytes.new (fontdata)) |
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face = hb.face_create (blob, 0) |
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del blob |
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font = hb.font_create (face) |
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upem = hb.face_get_upem (face) |
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del face |
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hb.font_set_scale (font, upem, upem) |
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#hb.ft_font_set_funcs (font) |
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hb.ot_font_set_funcs (font) |
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buf = hb.buffer_create () |
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class Debugger (object): |
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def message (self, buf, font, msg, data, _x_what_is_this): |
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print (msg) |
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return True |
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debugger = Debugger () |
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hb.buffer_set_message_func (buf, debugger.message, 1, 0) |
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## |
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## Add text to buffer |
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## |
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# |
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# See https://github.com/harfbuzz/harfbuzz/pull/271 |
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# |
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# If you do not care about cluster values reflecting Python |
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# string indices, then this is quickest way to add text to |
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# buffer: |
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# hb.buffer_add_utf8 (buf, text.encode('utf-8'), 0, -1) |
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# Otherwise, then following handles both narrow and wide |
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# Python builds (the first item in the array is BOM, so we skip it): |
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if sys.maxunicode == 0x10FFFF: |
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hb.buffer_add_utf32 (buf, array.array ('I', text.encode ('utf-32'))[1:], 0, -1) |
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else: |
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hb.buffer_add_utf16 (buf, array.array ('H', text.encode ('utf-16'))[1:], 0, -1) |
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hb.buffer_guess_segment_properties (buf) |
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hb.shape (font, buf, []) |
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del font |
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infos = hb.buffer_get_glyph_infos (buf) |
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positions = hb.buffer_get_glyph_positions (buf) |
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for info, pos in zip (infos, positions): |
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gid = info.codepoint |
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cluster = info.cluster |
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x_advance = pos.x_advance |
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x_offset = pos.x_offset |
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y_offset = pos.y_offset |
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print ("gid%d=%d@%d,%d+%d" % (gid, cluster, x_advance, x_offset, y_offset))
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