hb-subset-input.cc

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/*
 * Copyright © 2018  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): Garret Rieger, Rod Sheeter, Behdad Esfahbod
 */
 
#include "hb-subset.hh"
#include "hb-set.hh"
 
hb_subset_input_t *
hb_subset_input_create_or_fail (void)
{
  hb_subset_input_t *input = hb_object_create<hb_subset_input_t>();
 
  if (unlikely (!input))
    return nullptr;
 
  for (auto& set : input->sets_iter ())
    set = hb_set_create ();
 
  if (input->in_error ())
  {
    hb_subset_input_destroy (input);
    return nullptr;
  }
 
  input->flags = HB_SUBSET_FLAGS_DEFAULT;
 
  hb_set_add_range (input->sets.name_ids, 0, 6);
  hb_set_add (input->sets.name_languages, 0x0409);
 
  hb_tag_t default_drop_tables[] = {
    // Layout disabled by default
    HB_TAG ('m', 'o', 'r', 'x'),
    HB_TAG ('m', 'o', 'r', 't'),
    HB_TAG ('k', 'e', 'r', 'x'),
    HB_TAG ('k', 'e', 'r', 'n'),
 
    // Copied from fontTools:
    HB_TAG ('B', 'A', 'S', 'E'),
    HB_TAG ('J', 'S', 'T', 'F'),
    HB_TAG ('D', 'S', 'I', 'G'),
    HB_TAG ('E', 'B', 'D', 'T'),
    HB_TAG ('E', 'B', 'L', 'C'),
    HB_TAG ('E', 'B', 'S', 'C'),
    HB_TAG ('S', 'V', 'G', ' '),
    HB_TAG ('P', 'C', 'L', 'T'),
    HB_TAG ('L', 'T', 'S', 'H'),
    // Graphite tables
    HB_TAG ('F', 'e', 'a', 't'),
    HB_TAG ('G', 'l', 'a', 't'),
    HB_TAG ('G', 'l', 'o', 'c'),
    HB_TAG ('S', 'i', 'l', 'f'),
    HB_TAG ('S', 'i', 'l', 'l'),
  };
  input->sets.drop_tables->add_array (default_drop_tables, ARRAY_LENGTH (default_drop_tables));
 
  hb_tag_t default_no_subset_tables[] = {
    HB_TAG ('a', 'v', 'a', 'r'),
    HB_TAG ('f', 'v', 'a', 'r'),
    HB_TAG ('g', 'a', 's', 'p'),
    HB_TAG ('c', 'v', 't', ' '),
    HB_TAG ('f', 'p', 'g', 'm'),
    HB_TAG ('p', 'r', 'e', 'p'),
    HB_TAG ('V', 'D', 'M', 'X'),
    HB_TAG ('D', 'S', 'I', 'G'),
    HB_TAG ('M', 'V', 'A', 'R'),
    HB_TAG ('c', 'v', 'a', 'r'),
    HB_TAG ('S', 'T', 'A', 'T'),
  };
  input->sets.no_subset_tables->add_array (default_no_subset_tables,
                                         ARRAY_LENGTH (default_no_subset_tables));
 
  //copied from _layout_features_groups in fonttools
  hb_tag_t default_layout_features[] = {
    // default shaper
    // common
    HB_TAG ('r', 'v', 'r', 'n'),
    HB_TAG ('c', 'c', 'm', 'p'),
    HB_TAG ('l', 'i', 'g', 'a'),
    HB_TAG ('l', 'o', 'c', 'l'),
    HB_TAG ('m', 'a', 'r', 'k'),
    HB_TAG ('m', 'k', 'm', 'k'),
    HB_TAG ('r', 'l', 'i', 'g'),
 
    //fractions
    HB_TAG ('f', 'r', 'a', 'c'),
    HB_TAG ('n', 'u', 'm', 'r'),
    HB_TAG ('d', 'n', 'o', 'm'),
 
    //horizontal
    HB_TAG ('c', 'a', 'l', 't'),
    HB_TAG ('c', 'l', 'i', 'g'),
    HB_TAG ('c', 'u', 'r', 's'),
    HB_TAG ('k', 'e', 'r', 'n'),
    HB_TAG ('r', 'c', 'l', 't'),
 
    //vertical
    HB_TAG ('v', 'a', 'l', 't'),
    HB_TAG ('v', 'e', 'r', 't'),
    HB_TAG ('v', 'k', 'r', 'n'),
    HB_TAG ('v', 'p', 'a', 'l'),
    HB_TAG ('v', 'r', 't', '2'),
 
    //ltr
    HB_TAG ('l', 't', 'r', 'a'),
    HB_TAG ('l', 't', 'r', 'm'),
 
    //rtl
    HB_TAG ('r', 't', 'l', 'a'),
    HB_TAG ('r', 't', 'l', 'm'),
 
    //Complex shapers
    //arabic
    HB_TAG ('i', 'n', 'i', 't'),
    HB_TAG ('m', 'e', 'd', 'i'),
    HB_TAG ('f', 'i', 'n', 'a'),
    HB_TAG ('i', 's', 'o', 'l'),
    HB_TAG ('m', 'e', 'd', '2'),
    HB_TAG ('f', 'i', 'n', '2'),
    HB_TAG ('f', 'i', 'n', '3'),
    HB_TAG ('c', 's', 'w', 'h'),
    HB_TAG ('m', 's', 'e', 't'),
    HB_TAG ('s', 't', 'c', 'h'),
 
    //hangul
    HB_TAG ('l', 'j', 'm', 'o'),
    HB_TAG ('v', 'j', 'm', 'o'),
    HB_TAG ('t', 'j', 'm', 'o'),
 
    //tibetan
    HB_TAG ('a', 'b', 'v', 's'),
    HB_TAG ('b', 'l', 'w', 's'),
    HB_TAG ('a', 'b', 'v', 'm'),
    HB_TAG ('b', 'l', 'w', 'm'),
 
    //indic
    HB_TAG ('n', 'u', 'k', 't'),
    HB_TAG ('a', 'k', 'h', 'n'),
    HB_TAG ('r', 'p', 'h', 'f'),
    HB_TAG ('r', 'k', 'r', 'f'),
    HB_TAG ('p', 'r', 'e', 'f'),
    HB_TAG ('b', 'l', 'w', 'f'),
    HB_TAG ('h', 'a', 'l', 'f'),
    HB_TAG ('a', 'b', 'v', 'f'),
    HB_TAG ('p', 's', 't', 'f'),
    HB_TAG ('c', 'f', 'a', 'r'),
    HB_TAG ('v', 'a', 't', 'u'),
    HB_TAG ('c', 'j', 'c', 't'),
    HB_TAG ('i', 'n', 'i', 't'),
    HB_TAG ('p', 'r', 'e', 's'),
    HB_TAG ('a', 'b', 'v', 's'),
    HB_TAG ('b', 'l', 'w', 's'),
    HB_TAG ('p', 's', 't', 's'),
    HB_TAG ('h', 'a', 'l', 'n'),
    HB_TAG ('d', 'i', 's', 't'),
    HB_TAG ('a', 'b', 'v', 'm'),
    HB_TAG ('b', 'l', 'w', 'm'),
  };
 
  input->sets.layout_features->add_array (default_layout_features, ARRAY_LENGTH (default_layout_features));
 
  if (input->in_error ())
  {
    hb_subset_input_destroy (input);
    return nullptr;
  }
  return input;
}
 
hb_subset_input_t *
hb_subset_input_reference (hb_subset_input_t *input)
{
  return hb_object_reference (input);
}
 
void
hb_subset_input_destroy (hb_subset_input_t *input)
{
  if (!hb_object_destroy (input)) return;
 
  for (hb_set_t* set : input->sets_iter ())
    hb_set_destroy (set);
 
  hb_free (input);
}
 
HB_EXTERN hb_set_t *
hb_subset_input_unicode_set (hb_subset_input_t *input)
{
  return input->sets.unicodes;
}
 
HB_EXTERN hb_set_t *
hb_subset_input_glyph_set (hb_subset_input_t *input)
{
  return input->sets.glyphs;
}
 
HB_EXTERN hb_set_t *
hb_subset_input_set (hb_subset_input_t *input, hb_subset_sets_t set_type)
{
  return input->sets_iter () [set_type];
}
 
HB_EXTERN hb_subset_flags_t
hb_subset_input_get_flags (hb_subset_input_t *input)
{
  return (hb_subset_flags_t) input->flags;
}
 
HB_EXTERN void
hb_subset_input_set_flags (hb_subset_input_t *input,
               unsigned value)
{
  input->flags = (hb_subset_flags_t) value;
}
 
hb_bool_t
hb_subset_input_set_user_data (hb_subset_input_t  *input,
                   hb_user_data_key_t *key,
                   void *          data,
                   hb_destroy_func_t   destroy,
                   hb_bool_t       replace)
{
  return hb_object_set_user_data (input, key, data, destroy, replace);
}
 
void *
hb_subset_input_get_user_data (const hb_subset_input_t *input,
                   hb_user_data_key_t     *key)
{
  return hb_object_get_user_data (input, key);
}