Roll harfbuzz-ng to 1.0.5

third_party/harfbuzz-ng/src/hb-shape.cc

 /*
  * Copyright © 2009  Red Hat, Inc.
  * Copyright © 2012  Google, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *
  * Permission is hereby granted, without written agreement and without
  * license or royalty fees, to use, copy, modify, and distribute this
  * software and its documentation for any purpose, provided that the
  * above copyright notice and the following two paragraphs appear in
@@ skipping 353 matching lines @@
  *
  * Since: 0.9.2
  **/
 hb_bool_t
 hb_shape_full (hb_font_t          *font,
                hb_buffer_t        *buffer,
                const hb_feature_t *features,
                unsigned int        num_features,
                const char * const *shaper_list)
 {
-  if (unlikely (!buffer->len))
-    return true;
-
-  assert (buffer->content_type == HB_BUFFER_CONTENT_TYPE_UNICODE);
-
   hb_shape_plan_t *shape_plan = hb_shape_plan_create_cached (font->face, &buffer->props, features, num_features, shaper_list);
   hb_bool_t res = hb_shape_plan_execute (shape_plan, font, buffer, features, num_features);
   hb_shape_plan_destroy (shape_plan);
 
   if (res)
     buffer->content_type = HB_BUFFER_CONTENT_TYPE_GLYPHS;
   return res;
 }
 
 /**
  * hb_shape:
  * @font: an #hb_font_t to use for shaping
  * @buffer: an #hb_buffer_t to shape
  * @features: (array length=num_features) (allow-none): an array of user
  *    specified #hb_feature_t or %NULL
  * @num_features: the length of @features array
  *
  * Shapes @buffer using @font turning its Unicode characters content to
  * positioned glyphs. If @features is not %NULL, it will be used to control the
  * features applied during shaping.
  *
  * Return value: %FALSE if all shapers failed, %TRUE otherwise
  *
- * Since: 1.0
+ * Since: 0.9.2
  **/
 void
 hb_shape (hb_font_t           *font,
           hb_buffer_t         *buffer,
           const hb_feature_t  *features,
           unsigned int         num_features)
 {
   hb_shape_full (font, buffer, features, num_features, NULL);
 }