src/test-item-varstore.cc

/*
 * Copyright © 2020  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
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 * 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.
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 * 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
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#include "hb-ot-var-common.hh"
#include "hb-ot-var-hvar-table.hh"
// HVAR table data from SourceSerif4Variable-Roman_subset.otf
const char hvar_data[] = "\x0\x1\x0\x0\x0\x0\x0\x14\x0\x0\x0\xc4\x0\x0\x0\x0\x0\x0\x0\x0\x0\x1\x0\x0\x0\x10\x0\x2\x0\x0\x0\x74\x0\x0\x0\x7a\x0\x2\x0\x8\xc0\x0\xc0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x40\x0\x40\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\xc0\x0\xc0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x40\x0\x40\x0\xc0\x0\xc0\x0\x0\x0\xc0\x0\xc0\x0\x0\x0\xc0\x0\xc0\x0\x0\x0\x0\x0\x40\x0\x40\x0\x0\x0\x40\x0\x40\x0\xc0\x0\xc0\x0\x0\x0\x0\x0\x40\x0\x40\x0\x0\x0\x40\x0\x40\x0\x0\x1\x0\x0\x0\x0\x0\x4\x0\x0\x0\x8\x0\x0\x0\x1\x0\x2\x0\x3\x0\x4\x0\x5\x0\x6\x0\x7\xf9\xf\x2f\xbf\xfb\xfb\x35\xf9\x4\x4\xf3\xb4\xf2\xfb\x2e\xf3\x4\x4\xe\xad\xfa\x1\x1a\x1\x15\x22\x59\xd6\xe3\xf6\x6\xf5\x0\x1\x0\x5\x0\x4\x7\x5\x6";

static void
test_item_variations ()
{
  const OT::HVAR* hvar_table = reinterpret_cast<const OT::HVAR*> (hvar_data);

  hb_tag_t axis_tag = HB_TAG ('w', 'g', 'h', 't');
  hb_map_t axis_idx_tag_map;
  axis_idx_tag_map.set (0, axis_tag);

  axis_tag = HB_TAG ('o', 'p', 's', 'z');
  axis_idx_tag_map.set (1, axis_tag);

  OT::item_variations_t item_vars;
  const OT::ItemVariationStore& src_var_store = hvar_table+(hvar_table->varStore);
  bool result = item_vars.create_from_item_varstore (src_var_store, axis_idx_tag_map);
      
  hb_always_assert (result);

  /* partial instancing wght=300:800 */
  hb_hashmap_t<hb_tag_t, Triple> normalized_axes_location;
  normalized_axes_location.set (axis_tag, Triple (-0.512817, 0.0, 0.7000120));

  hb_hashmap_t<hb_tag_t, TripleDistances> axes_triple_distances;
  axes_triple_distances.set (axis_tag, TripleDistances (200.0, 500.0));

  result = item_vars.instantiate_tuple_vars (normalized_axes_location, axes_triple_distances);
  hb_always_assert (result);
  result = item_vars.as_item_varstore (false);
  hb_always_assert (result);
  hb_always_assert (item_vars.get_region_list().length == 8);
}

static void
test_item_variations_overflow ()
{
  hb_vector_t<hb_vector_t<int>> row_storage;
  hb_hashmap_t<unsigned, const hb_vector_t<int>*> front_mapping;
  OT::item_variations_t item_vars;
  unsigned old_varidx = 0;
  const unsigned total_count = 0xFFFFu * 2u;

  const unsigned counts[] = {
    128u,                 /* 0..127: 1-byte deltas */
    32768u - 128u,        /* 128..32767: 2-byte deltas */
    0xFFFFu * 2u - 32768u /* 32768..131069: 4-byte deltas */
  };
  const int starts[] = {
    0,
    128,
    32768
  };

  hb_always_assert (row_storage.alloc (total_count));

  for (unsigned bucket = 0; bucket < 3; bucket++)
  {
    hb_vector_t<const hb_vector_t<int>*> rows;
    hb_always_assert (rows.alloc (counts[bucket]));

    for (unsigned i = 0; i < counts[bucket]; i++)
    {
      hb_vector_t<int> row;
      hb_always_assert (row.resize (1));
      row[0] = starts[bucket] + i;
      row_storage.push (std::move (row));
    }

    hb_always_assert (!row_storage.in_error ());

    unsigned base = row_storage.length - counts[bucket];
    for (unsigned i = 0; i < counts[bucket]; i++)
    {
      const hb_vector_t<int> *row = &row_storage.arrayZ[base + i];
      rows.push (row);
      front_mapping.set (old_varidx++, row);
    }

    hb_always_assert (!rows.in_error ());
    hb_always_assert (item_vars.add_vardata_encoding_for_testing (std::move (rows), 1));
  }

  hb_always_assert (!front_mapping.in_error ());
  hb_always_assert (item_vars.compile_varidx_map_for_testing (front_mapping));

  const auto& encodings = item_vars.get_vardata_encodings ();
  hb_always_assert (encodings.length == 4);
  hb_always_assert (encodings[0].items.length == 128u);
  hb_always_assert (encodings[1].items.length == 32768u - 128u);
  hb_always_assert (encodings[2].items.length == 0xFFFFu);
  hb_always_assert (encodings[3].items.length == 32767u);

  const hb_map_t& varidx_map = item_vars.get_varidx_map ();
  hb_always_assert (varidx_map.get (0) == 0);
  hb_always_assert (varidx_map.get (127) == 127);
  hb_always_assert (varidx_map.get (128) == 0x00010000u);
  hb_always_assert (varidx_map.get (32767) == 0x00017F7Fu);
  hb_always_assert (varidx_map.get (32768) == 0x00020000u);
  hb_always_assert (varidx_map.get (98302) == 0x0002FFFEu);
  hb_always_assert (varidx_map.get (98303) == 0x00030000u);
  hb_always_assert (varidx_map.get (131069) == 0x00037FFEu);
}

int
main (int argc, char **argv)
{
  test_item_variations ();
  test_item_variations_overflow ();
}