kc3-lang/harfbuzz/util/hb-info.cc

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• Hash : edd5a37e
  Author :
  Date : 2023-01-19T18:39:32
  

  [hb-info] Implement script/language-sensitive --list-features
  
  I'm not very confident in the implementation.
  

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• util/hb-info.cc

• /*
   * Copyright © 2010  Behdad Esfahbod
   * Copyright © 2011,2012  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
   * all copies of this software.
   *
   * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
   * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
   * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
   * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
   * DAMAGE.
   *
   * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
   * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
   * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
   * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
   * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
   *
   * Google Author(s): Behdad Esfahbod
   */
  
  #include "batch.hh"
  #include "font-options.hh"
  
  const unsigned DEFAULT_FONT_SIZE = FONT_SIZE_UPEM;
  const unsigned SUBPIXEL_BITS = 0;
  
  
  struct info_t
  {
    void add_options (option_parser_t *parser)
    {
      GOptionEntry misc_entries[] =
      {
        {"direction",	0, 0, G_OPTION_ARG_STRING,	&this->direction_str,		"Set direction (default: ltr)",		"ltr/rtl/ttb/btt"},
        {"language",	0, 0, G_OPTION_ARG_STRING,	&this->language_str,		"Set language (default: $LANG)",	"BCP 47 tag"},
        {"script",	0, 0, G_OPTION_ARG_STRING,	&this->script_str,		"Set script (default: none)",		"ISO-15924 tag"},
  
        {nullptr}
      };
      parser->add_group (misc_entries,
  		       "misc",
  		       "Miscellaneaous options:",
  		       "Miscellaneaous options affecting queries",
  		       this,
  		       false /* We add below. */);
  
      GOptionEntry query_entries[] =
      {
        {"all",		'a', 0, G_OPTION_ARG_NONE,	&this->all,			"Show everything",		nullptr},
  
        {"show-all",	0, 0, G_OPTION_ARG_NONE,	&this->show_all,		"Show all short information (default)",	nullptr},
        {"show-family",	0, 0, G_OPTION_ARG_NONE,	&this->show_family,		"Show family name",		nullptr},
        {"show-style",	0, 0, G_OPTION_ARG_NONE,	&this->show_style,		"Show style name",		nullptr},
        {"show-unique-name",0, 0, G_OPTION_ARG_NONE,	&this->show_unique_name,	"Show unique name",		nullptr},
        {"show-full-name",0, 0, G_OPTION_ARG_NONE,	&this->show_full_name,		"Show full name",		nullptr},
        {"show-postscript-name",0, 0, G_OPTION_ARG_NONE,	&this->show_postscript_name,	"Show Postscript name",		nullptr},
        {"show-version",	0, 0, G_OPTION_ARG_NONE,	&this->show_version,		"Show version",			nullptr},
        {"show-upem",	0, 0, G_OPTION_ARG_NONE,	&this->show_upem,		"Show Units-Per-EM",		nullptr},
        {"show-unicode-count",0, 0, G_OPTION_ARG_NONE,	&this->show_unicode_count,	"Show Unicode count",		nullptr},
        {"show-glyph-count",0, 0, G_OPTION_ARG_NONE,	&this->show_glyph_count,	"Show glyph count",		nullptr},
        {"show-extents",	0, 0, G_OPTION_ARG_NONE,	&this->show_extents,		"Show extents",			nullptr},
  
        {"list-all",	0, 0, G_OPTION_ARG_NONE,	&this->list_all,		"List all long information",	nullptr},
        {"list-names",	0, 0, G_OPTION_ARG_NONE,	&this->list_names,		"List names",			nullptr},
        {"list-tables",	'l', 0, G_OPTION_ARG_NONE,	&this->list_tables,		"List tables",			nullptr},
        {"list-unicodes",	0, 0, G_OPTION_ARG_NONE,	&this->list_unicodes,		"List characters",		nullptr},
        {"list-glyphs",	0, 0, G_OPTION_ARG_NONE,	&this->list_glyphs,		"List glyphs",			nullptr},
        {"list-scripts",	0, 0, G_OPTION_ARG_NONE,	&this->list_scripts,		"List layout scripts",		nullptr},
        {"list-features",	0, 0, G_OPTION_ARG_NONE,	&this->list_features,		"List layout features",		nullptr},
  #ifndef HB_NO_VAR
        {"list-variations",0, 0, G_OPTION_ARG_NONE,	&this->list_variations,		"List variations",		nullptr},
  #endif
  
        {"dump-table",	0, 0, G_OPTION_ARG_STRING,	&this->dump_table,		"Dump font table",		"TABLE-TAG"},
  
        {nullptr}
      };
      parser->add_group (query_entries,
  		       "query",
  		       "Query options:",
  		       "Options to query the font instance",
  		       this,
  		       false /* We add below. */);
    }
  
    protected:
    hb_face_t *face = nullptr;
    hb_font_t *font = nullptr;
  
    hb_bool_t verbose = true;
    hb_bool_t first_item = true;
  
    char *direction_str = nullptr;
    char *script_str = nullptr;
    char *language_str = nullptr;
    hb_direction_t direction = HB_DIRECTION_LTR;
    hb_script_t script = HB_SCRIPT_INVALID;
    hb_language_t language = HB_LANGUAGE_INVALID;
  
    hb_bool_t all = false;
  
    hb_bool_t show_all = false;
    hb_bool_t show_family = false;
    hb_bool_t show_style = false;
    hb_bool_t show_unique_name = false;
    hb_bool_t show_full_name = false;
    hb_bool_t show_postscript_name = false;
    hb_bool_t show_version = false;
    hb_bool_t show_upem = false;
    hb_bool_t show_unicode_count = false;
    hb_bool_t show_glyph_count = false;
    hb_bool_t show_extents = false;
  
    hb_bool_t list_all = false;
    hb_bool_t list_names = false;
    hb_bool_t list_tables = false;
    hb_bool_t list_unicodes = false;
    hb_bool_t list_glyphs = false;
    hb_bool_t list_scripts = false;
    hb_bool_t list_features = false;
  #ifndef HB_NO_VAR
    hb_bool_t list_variations = false;
  #endif
  
    char *dump_table = nullptr;
  
    public:
  
    template <typename app_t>
    void operator () (app_t *app)
    {
      face = hb_face_reference (((font_options_t *) app)->face);
      font = hb_font_reference (((font_options_t *) app)->font);
      verbose = !app->quiet;
      if (direction_str)
        direction = hb_direction_from_string (direction_str, -1);
      if (script_str)
        script = hb_script_from_string (script_str, -1);
      language = hb_language_get_default ();
      if (language_str)
        language = hb_language_from_string (language_str, -1);
  
      if (all)
      {
        show_all =
        list_all =
        true;
      }
  
      if (show_all)
      {
        show_family =
        show_style =
        show_unique_name =
        show_full_name =
        show_postscript_name =
        show_version =
        show_upem =
        show_unicode_count =
        show_glyph_count =
        show_extents =
        true;
        first_item = false;
      }
  
      if (list_all)
      {
        list_names =
        list_tables =
        list_unicodes =
        list_glyphs =
        list_scripts =
        list_features =
  #ifndef HB_NO_VAR
        list_variations =
  #endif
        true;
      }
  
      if (show_family)	  _show_family ();
      if (show_style)	  _show_style ();
      if (show_unique_name) _show_unique_name ();
      if (show_full_name)	  _show_full_name ();
      if (show_postscript_name)_show_postscript_name ();
      if (show_version)	  _show_version ();
      if (show_upem)	  _show_upem ();
      if (show_unicode_count)_show_unicode_count ();
      if (show_glyph_count) _show_glyph_count ();
      if (show_extents)	  _show_extents ();
  
      if (list_names)	  _list_names ();
      if (list_tables)	  _list_tables ();
      if (list_unicodes)	  _list_unicodes ();
      if (list_glyphs)	  _list_glyphs ();
      if (list_scripts)	  _list_scripts ();
      if (list_features)	  _list_features ();
  #ifndef HB_NO_VAR
      if (list_variations)  _list_variations ();
  #endif
  
      if (dump_table)	  _dump_table ();
  
      hb_font_destroy (font);
      hb_face_destroy (face);
    }
  
    protected:
  
    void separator ()
    {
      if (first_item)
      {
        first_item = false;
        return;
      }
      printf ("\n===\n\n");
    }
  
    void _show_name (const char *label, hb_ot_name_id_t name_id)
    {
      if (verbose)
      {
        printf ("%s: ", label);
      }
  
      char name[16384];
      unsigned name_len = sizeof name;
      hb_ot_name_get_utf8 (face, name_id,
  			 language,
  			 &name_len, name);
  
      printf ("%s\n", name);
    }
    void _show_family ()		{ _show_name ("Family", 1); }
    void _show_style ()
    {
      hb_ot_name_id_t name_id = 2;
  
      unsigned named_instance = hb_font_get_var_named_instance (font);
      if (named_instance != HB_FONT_NO_VAR_NAMED_INSTANCE)
        name_id = hb_ot_var_named_instance_get_subfamily_name_id (face, named_instance);
  
      _show_name ("Style", name_id);
    }
    void _show_unique_name ()	{ _show_name ("Unique name", 3); }
    void _show_full_name ()	{ _show_name ("Full name", 4); }
    void _show_postscript_name ()
    {
      hb_ot_name_id_t name_id = 6;
  
      unsigned named_instance = hb_font_get_var_named_instance (font);
      if (named_instance != HB_FONT_NO_VAR_NAMED_INSTANCE)
        name_id = hb_ot_var_named_instance_get_postscript_name_id (face, named_instance);
  
  
      _show_name ("Postscript name", name_id);
    }
    void _show_version ()		{ _show_name ("Version", 5); }
  
    void _show_upem ()
    {
      if (verbose)
      {
        printf ("Units-Per-EM: ");
      }
  
      printf ("%u\n", hb_face_get_upem (face));
    }
  
    void _show_unicode_count ()
    {
      if (verbose)
      {
        printf ("Unicode count: ");
      }
  
      hb_set_t *unicodes = hb_set_create ();
      hb_face_collect_unicodes (face, unicodes);
  
      printf ("%u\n", hb_set_get_population (unicodes));
  
      hb_set_destroy (unicodes);
    }
  
    void _show_glyph_count ()
    {
      if (verbose)
      {
        printf ("Glyph count: ");
      }
  
      printf ("%u\n", hb_face_get_glyph_count (face));
    }
  
    void _show_extents ()
    {
      hb_font_extents_t extents;
      hb_font_get_extents_for_direction (font, direction, &extents);
  
      if (verbose) printf ("Ascender: ");
      printf ("%d\n", extents.ascender);
  
      if (verbose) printf ("Descender: ");
      printf ("%d\n", extents.descender);
  
      if (verbose) printf ("Line gap: ");
      printf ("%d\n", extents.line_gap);
    }
  
    void _list_names ()
    {
      if (verbose)
      {
        separator ();
        printf ("Name information:\n\n");
        printf ("Id	Text\n------------\n");
      }
  
      unsigned count;
      const auto *entries = hb_ot_name_list_names (face, &count);
      for (unsigned i = 0; i < count; i++)
      {
        char name[16384];
        unsigned name_len = sizeof name;
        hb_ot_name_get_utf8 (face, entries[i].name_id,
  			   language,
  			   &name_len, name);
  
        printf ("%u	%s\n", entries[i].name_id, name);
      }
    }
  
    void _list_tables ()
    {
      if (verbose)
      {
        separator ();
        printf ("Table information:\n\n");
        printf ("Tag	Size\n------------\n");
      }
  
      unsigned count = hb_face_get_table_tags (face, 0, nullptr, nullptr);
      hb_tag_t *tags = (hb_tag_t *) calloc (count, sizeof (hb_tag_t));
      hb_face_get_table_tags (face, 0, &count, tags);
  
      for (unsigned i = 0; i < count; i++)
      {
        hb_tag_t tag = tags[i];
  
        hb_blob_t *blob = hb_face_reference_table (face, tag);
  
        printf ("%c%c%c%c %8u bytes\n", HB_UNTAG (tag), hb_blob_get_length (blob));
  
        hb_blob_destroy (blob);
      }
  
      free (tags);
    }
  
    void
    _list_unicodes ()
    {
      if (verbose)
      {
        separator ();
        printf ("Character-set information:\n\n");
        printf ("Unicode	Glyph name\n------------------\n");
      }
  
      hb_set_t *unicodes = hb_set_create ();
      hb_map_t *cmap = hb_map_create ();
  
      hb_face_collect_nominal_glyph_mapping (face, cmap, unicodes);
  
      for (hb_codepoint_t u = HB_SET_VALUE_INVALID;
  	 hb_set_next (unicodes, &u);)
      {
        hb_codepoint_t gid = hb_map_get (cmap, u);
  
        char glyphname[64];
        hb_font_glyph_to_string (font, gid,
  			       glyphname, sizeof glyphname);
  
        printf ("U+%04X	%s\n", u, glyphname);
      }
  
      hb_map_destroy (cmap);
  
  
      /* List variation-selector sequences. */
      hb_set_t *vars = hb_set_create ();
  
      hb_face_collect_variation_selectors (face, vars);
  
      for (hb_codepoint_t vs = HB_SET_VALUE_INVALID;
  	 hb_set_next (vars, &vs);)
      {
        hb_set_clear (unicodes);
        hb_face_collect_variation_unicodes (face, vs, unicodes);
  
        for (hb_codepoint_t u = HB_SET_VALUE_INVALID;
  	   hb_set_next (unicodes, &u);)
        {
  	hb_codepoint_t gid = 0;
  	bool b = hb_font_get_variation_glyph (font, u, vs, &gid);
  	assert (b);
  
  	char glyphname[64];
  	hb_font_glyph_to_string (font, gid,
  				 glyphname, sizeof glyphname);
  
  	printf ("U+%04X,U+%04X	%s\n", vs, u, glyphname);
        }
      }
  
      hb_set_destroy (vars);
      hb_set_destroy (unicodes);
    }
  
    void
    _list_glyphs ()
    {
      if (verbose)
      {
        separator ();
        printf ("Glyph-set information:\n\n");
        printf ("GlyphID	Glyph name\n------------------\n");
      }
  
      unsigned num_glyphs = hb_face_get_glyph_count (face);
  
      for (hb_codepoint_t gid = 0; gid < num_glyphs; gid++)
      {
        char glyphname[64];
        hb_font_glyph_to_string (font, gid,
  			       glyphname, sizeof glyphname);
  
        printf ("%u	%s\n", gid, glyphname);
      }
    }
  
    void
    _list_scripts ()
    {
      if (verbose)
      {
        separator ();
        printf ("Layout script information:\n\n");
      }
  
      hb_tag_t table_tags[] = {HB_OT_TAG_GSUB, HB_OT_TAG_GPOS, HB_TAG_NONE};
  
      for (unsigned int i = 0; table_tags[i]; i++)
      {
        if (verbose) printf ("Table: ");
        printf ("%c%c%c%c\n", HB_UNTAG (table_tags[i]));
  
        hb_tag_t script_array[32];
        unsigned script_count = sizeof script_array / sizeof script_array[0];
        unsigned script_offset = 0;
        do
        {
  	hb_ot_layout_table_get_script_tags (face, table_tags[i],
  					    script_offset,
  					    &script_count,
  					    script_array);
  
  	for (unsigned script_index = 0; script_index < script_count; script_index++)
  	{
  	  printf ("	");
  	  if (verbose) printf ("Script: ");
  	  printf ("%c%c%c%c (%c%c%c%c)\n",
  		  HB_UNTAG (hb_script_to_iso15924_tag (hb_ot_tag_to_script (script_array[script_index]))),
  		  HB_UNTAG (script_array[script_index]));
  
  	  hb_tag_t language_array[32];
  	  unsigned language_count = sizeof language_array / sizeof language_array[0];
  	  unsigned language_offset = 0;
  	  do
  	  {
  	    hb_ot_layout_script_get_language_tags (face, table_tags[i],
  						   script_offset + script_index,
  						   language_offset,
  						   &language_count,
  						   language_array);
  
  	    for (unsigned language_index = 0; language_index < language_count; language_index++)
  	    {
  	      printf ("		");
  	      if (verbose) printf ("Language: ");
  	      printf ("%s (%c%c%c%c)\n",
  		      hb_language_to_string (hb_ot_tag_to_language (language_array[language_index])),
  		      HB_UNTAG (language_array[language_index]));
  	    }
  
  	    language_offset += language_count;
  	  }
  	  while (language_count == sizeof language_array / sizeof language_array[0]);
  	}
  
  	script_offset += script_count;
        }
        while (script_count == sizeof script_array / sizeof script_array[0]);
  
      }
  
    }
  
    void
    _list_features_no_script ()
    {
      hb_tag_t table_tags[] = {HB_OT_TAG_GSUB, HB_OT_TAG_GPOS, HB_TAG_NONE};
  
      hb_set_t *features = hb_set_create ();
  
      for (unsigned int i = 0; table_tags[i]; i++)
      {
        if (verbose) printf ("Table: ");
        printf ("%c%c%c%c\n", HB_UNTAG (table_tags[i]));
  
        hb_set_clear (features);
        hb_tag_t feature_array[32];
        unsigned feature_count = sizeof feature_array / sizeof feature_array[0];
        unsigned feature_offset = 0;
        do
        {
  	hb_ot_layout_table_get_feature_tags (face, table_tags[i],
  					     feature_offset,
  					     &feature_count,
  					     feature_array);
  
  	for (unsigned feature_index = 0; feature_index < feature_count; feature_index++)
  	{
  	  if (hb_set_has (features, feature_array[feature_index]))
  	    continue;
  	  hb_set_add (features, feature_array[feature_index]);
  
  	  hb_ot_name_id_t label_id;
  
  	  hb_ot_layout_feature_get_name_ids (face,
  					     table_tags[i],
  					     feature_offset + feature_index,
  					     &label_id,
  					     nullptr,
  					     nullptr,
  					     nullptr,
  					     nullptr);
  
  	  char name[64];
  	  unsigned name_len = sizeof name;
  
  	  hb_ot_name_get_utf8 (face, label_id,
  			       language,
  			       &name_len, name);
  
  	  printf ("	");
  	  if (verbose) printf ("Feature: ");
  	  printf ("%c%c%c%c", HB_UNTAG (feature_array[feature_index]));
  
  	  if (*name)
  	    printf ("	%s", name);
  
  	  printf ("\n");
  	}
  
  	feature_offset += feature_count;
        }
        while (feature_count == sizeof feature_array / sizeof feature_array[0]);
      }
  
      hb_set_destroy (features);
    }
  
    void
    _list_features ()
    {
      if (verbose)
      {
        separator ();
        printf ("Layout features information:\n\n");
      }
  
      hb_tag_t table_tags[] = {HB_OT_TAG_GSUB, HB_OT_TAG_GPOS, HB_TAG_NONE};
  
      if (script == HB_SCRIPT_INVALID)
      {
        _list_features_no_script ();
        return;
      }
  
      for (unsigned int i = 0; table_tags[i]; i++)
      {
        if (verbose) printf ("Table: ");
        printf ("%c%c%c%c\n", HB_UNTAG (table_tags[i]));
  
        auto table_tag = table_tags[i];
  
        hb_tag_t script_tags[HB_OT_MAX_TAGS_PER_SCRIPT];
        hb_tag_t language_tags[HB_OT_MAX_TAGS_PER_LANGUAGE];
        unsigned script_count = HB_OT_MAX_TAGS_PER_SCRIPT;
        unsigned language_count = HB_OT_MAX_TAGS_PER_LANGUAGE;
  
        hb_ot_tags_from_script_and_language (script, language,
  					   &script_count, script_tags,
  					   &language_count, language_tags);
  
        unsigned script_index;
        hb_ot_layout_table_select_script (face, table_tag,
  					script_count, script_tags,
  					&script_index, nullptr);
  
        unsigned language_index;
        hb_ot_layout_script_select_language (face, table_tag,
  					   script_index,
  					   language_count, language_tags,
  					   &language_index);
  
        unsigned feature_array[32];
        unsigned feature_count = sizeof feature_array / sizeof feature_array[0];
        unsigned feature_offset = 0;
        do
        {
  	hb_ot_layout_language_get_feature_indexes (face, table_tag,
  						   script_index, language_index,
  						   feature_offset,
  						   &feature_count,
  						   feature_array);
  
  	for (unsigned feature_index = 0; feature_index < feature_count; feature_index++)
  	{
  	  hb_ot_name_id_t label_id;
  
  	  hb_ot_layout_feature_get_name_ids (face,
  					     table_tags[i],
  					     feature_array[feature_index],
  					     &label_id,
  					     nullptr,
  					     nullptr,
  					     nullptr,
  					     nullptr);
  
  	  char name[64];
  	  unsigned name_len = sizeof name;
  
  	  hb_ot_name_get_utf8 (face, label_id,
  			       language,
  			       &name_len, name);
  
  	  printf ("	");
  	  if (verbose) printf ("Feature: ");
  	  hb_tag_t feature_tag;
  	  unsigned f_count = 1;
  	  hb_ot_layout_table_get_feature_tags (face, table_tag,
  					       feature_array[feature_index],
  					       &f_count, &feature_tag);
  	  printf ("%c%c%c%c", HB_UNTAG (feature_tag));
  
  	  if (*name)
  	    printf ("	%s", name);
  
  	  printf ("\n");
  	}
  
  	feature_offset += feature_count;
        }
        while (feature_count == sizeof feature_array / sizeof feature_array[0]);
      }
    }
  
  #ifndef HB_NO_VAR
    void
    _list_variations ()
    {
      if (verbose)
      {
        separator ();
        printf ("Face variations information:\n\n");
      }
  
      hb_ot_var_axis_info_t *axes;
  
      unsigned count = hb_ot_var_get_axis_infos (face, 0, nullptr, nullptr);
      axes = (hb_ot_var_axis_info_t *) calloc (count, sizeof (hb_ot_var_axis_info_t));
      hb_ot_var_get_axis_infos (face, 0, &count, axes);
  
      bool has_hidden = false;
  
      if (verbose && count)
      {
        printf ("Varitation axes:\n\n");
        printf ("Tag	Minimum	Default	Maximum	Name\n------------------------------------\n");
      }
      for (unsigned i = 0; i < count; i++)
      {
        const auto &axis = axes[i];
        if (axis.flags & HB_OT_VAR_AXIS_FLAG_HIDDEN)
  	has_hidden = true;
  
        char name[64];
        unsigned name_len = sizeof name;
  
        hb_ot_name_get_utf8 (face, axis.name_id,
  			   language,
  			   &name_len, name);
  
        printf ("%c%c%c%c%s	%g	%g	%g	%s\n",
  	      HB_UNTAG (axis.tag),
  	      axis.flags & HB_OT_VAR_AXIS_FLAG_HIDDEN ? "*" : "",
  	      (double) axis.min_value,
  	      (double) axis.default_value,
  	      (double) axis.max_value,
  	      name);
      }
      if (verbose && has_hidden)
        printf ("\n[*] Hidden axis\n\n");
  
      free (axes);
      axes = nullptr;
  
      count = hb_ot_var_get_named_instance_count (face);
      if (count)
      {
        if (verbose)
        {
  	printf ("\nNamed instances:\n\n");
        printf ("Index	Name				Position\n------------------------------------------------\n");
        }
  
        for (unsigned i = 0; i < count; i++)
        {
  	char name[64];
  	unsigned name_len = sizeof name;
  
  	hb_ot_name_id_t name_id = hb_ot_var_named_instance_get_subfamily_name_id (face, i);
  	hb_ot_name_get_utf8 (face, name_id,
  			     language,
  			     &name_len, name);
  
  	unsigned coords_count = hb_ot_var_named_instance_get_design_coords (face, i, nullptr, nullptr);
  	float* coords;
  	coords = (float *) calloc (coords_count, sizeof (float));
  	hb_ot_var_named_instance_get_design_coords (face, i, &coords_count, coords);
  
  	printf ("%u	%-32s", i, name);
  	for (unsigned j = 0; j < coords_count; j++)
  	  printf ("%g, ", (double) coords[j]);
  	printf ("\n");
  
  	free (coords);
        }
      }
    }
  #endif
  
    void
    _dump_table ()
    {
      hb_blob_t *blob = hb_face_reference_table (face, hb_tag_from_string (dump_table, -1));
      unsigned count = 0;
      const char *data = hb_blob_get_data (blob, &count);
      fwrite (data, 1, count, stdout);
      hb_blob_destroy (blob);
    }
  };
  
  
  template <typename consumer_t,
  	  typename font_options_type>
  struct main_font_t :
         option_parser_t,
         font_options_type,
         consumer_t
  {
    int operator () (int argc, char **argv)
    {
      add_options ();
  
      if (argc == 2)
        consumer_t::show_all = true;
  
      parse (&argc, &argv);
  
      consumer_t::operator () (this);
  
      return 0;
    }
  
    protected:
  
    void add_options ()
    {
      font_options_type::add_options (this);
      consumer_t::add_options (this);
  
      GOptionEntry entries[] =
      {
        {"quiet",		'q', 0, G_OPTION_ARG_NONE,	&this->quiet,			"Generate machine-readable output",	nullptr},
        {G_OPTION_REMAINING,	0, G_OPTION_FLAG_IN_MAIN,
  				G_OPTION_ARG_CALLBACK,	(gpointer) &collect_rest,	nullptr,	"[FONT-FILE]"},
        {nullptr}
      };
      add_main_group (entries, this);
      option_parser_t::add_options ();
    }
  
    private:
  
    static gboolean
    collect_rest (const char *name G_GNUC_UNUSED,
  		const char *arg,
  		gpointer    data,
  		GError    **error)
    {
      main_font_t *thiz = (main_font_t *) data;
  
      if (!thiz->font_file)
      {
        thiz->font_file = g_strdup (arg);
        return true;
      }
  
      g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_FAILED,
  		 "Too many arguments on the command line");
      return false;
    }
  
    public:
    hb_bool_t quiet = false;
  };
  
  int
  main (int argc, char **argv)
  {
    using main_t = main_font_t<info_t, font_options_t>;
    return batch_main<main_t> (argc, argv);
  }
  

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