1 files changed, 71 insertions, 0 deletions
diff --git a/src/silfont/harfbuzz.py b/src/silfont/harfbuzz.py
new file mode 100644
index 0000000..75728ca
--- /dev/null
+++ b/src/silfont/harfbuzz.py
@@ -0,0 +1,71 @@
+#!/usr/bin/env python3
+'Harfbuzz support for fonttools'
+
+import gi
+gi.require_version('HarfBuzz', '0.0')
+from gi.repository import HarfBuzz as hb
+from gi.repository import GLib
+
+class Glyph(object):
+    def __init__(self, gid, **kw):
+        self.gid = gid
+        for k,v in kw.items():
+            setattr(self, k, v)
+
+    def __repr__(self):
+        return "[{gid}@({offset[0]},{offset[1]})+({advance[0]},{advance[1]})]".format(**self.__dict__)
+
+def shape_text(f, text, features = [], lang=None, dir="", script="", shapers=""):
+    fontfile = f.reader.file
+    fontfile.seek(0, 0)
+    fontdata = fontfile.read()
+    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.ot_font_set_funcs(font)
+
+    buf = hb.buffer_create()
+    t = text.encode('utf-8')
+    hb.buffer_add_utf8(buf, t, 0, -1)
+    hb.buffer_guess_segment_properties(buf)
+    if dir:
+        hb.buffer_set_direction(buf, hb.direction_from_string(dir))
+    if script:
+        hb.buffer_set_script(buf, hb.script_from_string(script))
+    if lang:
+        hb.buffer_set_language(buf, hb.language_from_string(lang))
+    
+    feats = []
+    if len(features):
+        for feat_string in features:
+            if hb.feature_from_string(feat_string, -1, aFeats):
+                feats.append(aFeats)
+    if shapers:
+        hb.shape_full(font, buf, feats, shapers)
+    else:
+        hb.shape(font, buf, feats)
+
+    num_glyphs = hb.buffer_get_length(buf)
+    info = hb.buffer_get_glyph_infos(buf)
+    pos = hb.buffer_get_glyph_positions(buf)
+
+    glyphs = []
+    for i in range(num_glyphs):
+        glyphs.append(Glyph(info[i].codepoint, cluster = info[i].cluster,
+                        offset = (pos[i].x_offset, pos[i].y_offset),
+                        advance = (pos[i].x_advance, pos[i].y_advance),
+                        flags = info[i].mask))
+    return glyphs
+
+if __name__ == '__main__':
+    import sys
+    from fontTools.ttLib import TTFont
+    font = sys.argv[1]
+    text = sys.argv[2]
+    f = TTFont(font)
+    glyphs = shape_text(f, text)
+    print(glyphs)