188 lines
6.3 KiB
C
188 lines
6.3 KiB
C
/*
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* Copyright © 2018 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Google Author(s): Roderick Sheeter
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*/
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#include "hb-test.h"
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#include "hb-subset-test.h"
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/* Unit tests for hmtx subsetting */
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static void check_num_hmetrics(hb_face_t *face, uint16_t expected_num_hmetrics)
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{
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hb_blob_t *hhea_blob = hb_face_reference_table (face, HB_TAG ('h','h','e','a'));
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hb_blob_t *hmtx_blob = hb_face_reference_table (face, HB_TAG ('h','m','t','x'));
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// TODO I sure wish I could just use the hmtx table struct!
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unsigned int hhea_len;
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uint8_t *raw_hhea = (uint8_t *) hb_blob_get_data(hhea_blob, &hhea_len);
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uint16_t num_hmetrics = (raw_hhea[hhea_len - 2] << 8) + raw_hhea[hhea_len - 1];
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g_assert_cmpuint(expected_num_hmetrics, ==, num_hmetrics);
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hb_blob_destroy (hhea_blob);
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hb_blob_destroy (hmtx_blob);
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}
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static void
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test_subset_hmtx_simple_subset (void)
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{
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hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");
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hb_face_t *face_ac = hb_test_open_font_file ("fonts/Roboto-Regular.ac.ttf");
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hb_set_t *codepoints = hb_set_create ();
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hb_face_t *face_abc_subset;
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hb_set_add (codepoints, 'a');
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hb_set_add (codepoints, 'c');
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face_abc_subset = hb_subset_test_create_subset (face_abc, hb_subset_test_create_input (codepoints));
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hb_set_destroy (codepoints);
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check_num_hmetrics(face_abc_subset, 3); /* nothing has same width */
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hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('h','m','t','x'));
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hb_face_destroy (face_abc_subset);
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hb_face_destroy (face_abc);
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hb_face_destroy (face_ac);
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}
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static void
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test_subset_hmtx_monospace (void)
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{
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hb_face_t *face_abc = hb_test_open_font_file ("fonts/Inconsolata-Regular.abc.ttf");
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hb_face_t *face_ac = hb_test_open_font_file ("fonts/Inconsolata-Regular.ac.ttf");
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hb_set_t *codepoints = hb_set_create ();
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hb_face_t *face_abc_subset;
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hb_set_add (codepoints, 'a');
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hb_set_add (codepoints, 'c');
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face_abc_subset = hb_subset_test_create_subset (face_abc, hb_subset_test_create_input (codepoints));
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hb_set_destroy (codepoints);
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check_num_hmetrics(face_abc_subset, 1); /* everything has same width */
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hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('h','m','t','x'));
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hb_face_destroy (face_abc_subset);
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hb_face_destroy (face_abc);
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hb_face_destroy (face_ac);
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}
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static void
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test_subset_hmtx_keep_num_metrics (void)
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{
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hb_face_t *face_abc = hb_test_open_font_file ("fonts/Inconsolata-Regular.abc.widerc.ttf");
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hb_face_t *face_ac = hb_test_open_font_file ("fonts/Inconsolata-Regular.ac.widerc.ttf");
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hb_set_t *codepoints = hb_set_create ();
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hb_face_t *face_abc_subset;
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hb_set_add (codepoints, 'a');
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hb_set_add (codepoints, 'c');
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face_abc_subset = hb_subset_test_create_subset (face_abc, hb_subset_test_create_input (codepoints));
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hb_set_destroy (codepoints);
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check_num_hmetrics(face_abc_subset, 3); /* c is wider */
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hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('h','m','t','x'));
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hb_face_destroy (face_abc_subset);
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hb_face_destroy (face_abc);
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hb_face_destroy (face_ac);
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}
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static void
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test_subset_hmtx_decrease_num_metrics (void)
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{
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hb_face_t *face_abc = hb_test_open_font_file ("fonts/Inconsolata-Regular.abc.widerc.ttf");
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hb_face_t *face_ab = hb_test_open_font_file ("fonts/Inconsolata-Regular.ab.ttf");
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hb_set_t *codepoints = hb_set_create ();
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hb_face_t *face_abc_subset;
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hb_set_add (codepoints, 'a');
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hb_set_add (codepoints, 'b');
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face_abc_subset = hb_subset_test_create_subset (face_abc, hb_subset_test_create_input (codepoints));
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hb_set_destroy (codepoints);
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check_num_hmetrics(face_abc_subset, 1); /* everything left has same width */
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hb_subset_test_check (face_ab, face_abc_subset, HB_TAG ('h','m','t','x'));
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hb_face_destroy (face_abc_subset);
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hb_face_destroy (face_abc);
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hb_face_destroy (face_ab);
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}
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static void
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test_subset_hmtx_noop (void)
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{
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hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");
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hb_set_t *codepoints = hb_set_create();
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hb_face_t *face_abc_subset;
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hb_set_add (codepoints, 'a');
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hb_set_add (codepoints, 'b');
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hb_set_add (codepoints, 'c');
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face_abc_subset = hb_subset_test_create_subset (face_abc, hb_subset_test_create_input (codepoints));
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hb_set_destroy (codepoints);
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check_num_hmetrics(face_abc_subset, 4); /* nothing has same width */
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hb_subset_test_check (face_abc, face_abc_subset, HB_TAG ('h','m','t','x'));
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hb_face_destroy (face_abc_subset);
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hb_face_destroy (face_abc);
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}
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static void
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test_subset_invalid_hmtx (void)
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{
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hb_face_t *face = hb_test_open_font_file ("../fuzzing/fonts/crash-e4e0bb1458a91b692eba492c907ae1f94e635480");
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hb_face_t *subset;
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hb_subset_input_t *input = hb_subset_input_create_or_fail ();
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hb_set_t *codepoints = hb_subset_input_unicode_set (input);
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hb_set_add (codepoints, 'a');
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hb_set_add (codepoints, 'b');
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hb_set_add (codepoints, 'c');
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subset = hb_subset (face, input);
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g_assert (subset);
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g_assert (subset == hb_face_get_empty ());
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hb_subset_input_destroy (input);
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hb_face_destroy (subset);
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hb_face_destroy (face);
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}
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int
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main (int argc, char **argv)
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{
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hb_test_init (&argc, &argv);
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hb_test_add (test_subset_hmtx_simple_subset);
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hb_test_add (test_subset_hmtx_monospace);
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hb_test_add (test_subset_hmtx_keep_num_metrics);
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hb_test_add (test_subset_hmtx_decrease_num_metrics);
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hb_test_add (test_subset_hmtx_noop);
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hb_test_add (test_subset_invalid_hmtx);
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return hb_test_run();
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}
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