1  /*
       2   * Copyright © 2018  Google, Inc.
       3   *
       4   *  This is part of HarfBuzz, a text shaping library.
       5   *
       6   * Permission is hereby granted, without written agreement and without
       7   * license or royalty fees, to use, copy, modify, and distribute this
       8   * software and its documentation for any purpose, provided that the
       9   * above copyright notice and the following two paragraphs appear in
      10   * all copies of this software.
      11   *
      12   * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
      13   * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
      14   * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
      15   * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
      16   * DAMAGE.
      17   *
      18   * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
      19   * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
      20   * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
      21   * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
      22   * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
      23   *
      24   * Google Author(s): Garret Rieger
      25   */
      26  
      27  #include "hb-test.h"
      28  #include "hb-subset-test.h"
      29  
      30  /* Unit tests for hmtx subsetting */
      31  
      32  static void check_num_vmetrics(hb_face_t *face, uint16_t expected_num_vmetrics)
      33  {
      34    hb_blob_t *vhea_blob = hb_face_reference_table (face, HB_TAG ('v','h','e','a'));
      35    hb_blob_t *vmtx_blob = hb_face_reference_table (face, HB_TAG ('v','m','t','x'));
      36  
      37    unsigned int vhea_len;
      38    uint8_t *raw_vhea = (uint8_t *) hb_blob_get_data(vhea_blob, &vhea_len);
      39    uint16_t num_vmetrics = (raw_vhea[vhea_len - 2] << 8) + raw_vhea[vhea_len - 1];
      40    g_assert_cmpuint(expected_num_vmetrics, ==, num_vmetrics);
      41  
      42    hb_blob_destroy (vhea_blob);
      43    hb_blob_destroy (vmtx_blob);
      44  }
      45  
      46  static void
      47  test_subset_vmtx_simple_subset (void)
      48  {
      49    hb_face_t *face_full = hb_test_open_font_file ("fonts/Mplus1p-Regular.660E,6975,73E0,5EA6,8F38,6E05.ttf");
      50    hb_face_t *face_subset = hb_test_open_font_file ("fonts/Mplus1p-Regular.660E.ttf");
      51    hb_face_t *face_full_subset;
      52  
      53    hb_set_t *codepoints = hb_set_create ();
      54    hb_set_add (codepoints, 0x660E);
      55  
      56    face_full_subset = hb_subset_test_create_subset (face_full, hb_subset_test_create_input (codepoints));
      57    hb_set_destroy (codepoints);
      58  
      59    check_num_vmetrics(face_full_subset, 1); /* nothing has same width */
      60    hb_subset_test_check (face_subset, face_full_subset, HB_TAG ('v','m','t','x'));
      61  
      62    hb_face_destroy (face_full_subset);
      63    hb_face_destroy (face_full);
      64    hb_face_destroy (face_subset);
      65  }
      66  
      67  static void
      68  test_subset_vmtx_noop (void)
      69  {
      70    hb_face_t *face_full = hb_test_open_font_file ("fonts/Mplus1p-Regular.660E,6975,73E0,5EA6,8F38,6E05.ttf");
      71    hb_face_t *face_full_subset;
      72  
      73    hb_set_t *codepoints = hb_set_create();
      74    hb_set_add (codepoints, 0x660E);
      75    hb_set_add (codepoints, 0x6975);
      76    hb_set_add (codepoints, 0x73E0);
      77    hb_set_add (codepoints, 0x5EA6);
      78    hb_set_add (codepoints, 0x8F38);
      79    hb_set_add (codepoints, 0x6E05);
      80    face_full_subset = hb_subset_test_create_subset (face_full, hb_subset_test_create_input (codepoints));
      81    hb_set_destroy (codepoints);
      82  
      83    check_num_vmetrics(face_full_subset, 1); /* all have the same width */
      84    hb_subset_test_check (face_full, face_full_subset, HB_TAG ('v','m','t','x'));
      85  
      86    hb_face_destroy (face_full_subset);
      87    hb_face_destroy (face_full);
      88  }
      89  
      90  int
      91  main (int argc, char **argv)
      92  {
      93    hb_test_init (&argc, &argv);
      94  
      95    hb_test_add (test_subset_vmtx_simple_subset);
      96    hb_test_add (test_subset_vmtx_noop);
      97  
      98    return hb_test_run();
      99  }