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): Roderick Sheeter
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_hmetrics(hb_face_t *face, uint16_t expected_num_hmetrics)
33 {
34 hb_blob_t *hhea_blob = hb_face_reference_table (face, HB_TAG ('h','h','e','a'));
35 hb_blob_t *hmtx_blob = hb_face_reference_table (face, HB_TAG ('h','m','t','x'));
36
37 // TODO I sure wish I could just use the hmtx table struct!
38 unsigned int hhea_len;
39 uint8_t *raw_hhea = (uint8_t *) hb_blob_get_data(hhea_blob, &hhea_len);
40 uint16_t num_hmetrics = (raw_hhea[hhea_len - 2] << 8) + raw_hhea[hhea_len - 1];
41 g_assert_cmpuint(expected_num_hmetrics, ==, num_hmetrics);
42
43 hb_blob_destroy (hhea_blob);
44 hb_blob_destroy (hmtx_blob);
45 }
46
47 static void
48 test_subset_hmtx_simple_subset (void)
49 {
50 hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");
51 hb_face_t *face_ac = hb_test_open_font_file ("fonts/Roboto-Regular.ac.ttf");
52
53 hb_set_t *codepoints = hb_set_create ();
54 hb_face_t *face_abc_subset;
55 hb_set_add (codepoints, 'a');
56 hb_set_add (codepoints, 'c');
57 face_abc_subset = hb_subset_test_create_subset (face_abc, hb_subset_test_create_input (codepoints));
58 hb_set_destroy (codepoints);
59
60 check_num_hmetrics(face_abc_subset, 3); /* nothing has same width */
61 hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('h','m','t','x'));
62
63 hb_face_destroy (face_abc_subset);
64 hb_face_destroy (face_abc);
65 hb_face_destroy (face_ac);
66 }
67
68
69 static void
70 test_subset_hmtx_monospace (void)
71 {
72 hb_face_t *face_abc = hb_test_open_font_file ("fonts/Inconsolata-Regular.abc.ttf");
73 hb_face_t *face_ac = hb_test_open_font_file ("fonts/Inconsolata-Regular.ac.ttf");
74
75 hb_set_t *codepoints = hb_set_create ();
76 hb_face_t *face_abc_subset;
77 hb_set_add (codepoints, 'a');
78 hb_set_add (codepoints, 'c');
79 face_abc_subset = hb_subset_test_create_subset (face_abc, hb_subset_test_create_input (codepoints));
80 hb_set_destroy (codepoints);
81
82 check_num_hmetrics(face_abc_subset, 1); /* everything has same width */
83 hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('h','m','t','x'));
84
85 hb_face_destroy (face_abc_subset);
86 hb_face_destroy (face_abc);
87 hb_face_destroy (face_ac);
88 }
89
90
91 static void
92 test_subset_hmtx_keep_num_metrics (void)
93 {
94 hb_face_t *face_abc = hb_test_open_font_file ("fonts/Inconsolata-Regular.abc.widerc.ttf");
95 hb_face_t *face_ac = hb_test_open_font_file ("fonts/Inconsolata-Regular.ac.widerc.ttf");
96
97 hb_set_t *codepoints = hb_set_create ();
98 hb_face_t *face_abc_subset;
99 hb_set_add (codepoints, 'a');
100 hb_set_add (codepoints, 'c');
101 face_abc_subset = hb_subset_test_create_subset (face_abc, hb_subset_test_create_input (codepoints));
102 hb_set_destroy (codepoints);
103
104 check_num_hmetrics(face_abc_subset, 3); /* c is wider */
105 hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('h','m','t','x'));
106
107 hb_face_destroy (face_abc_subset);
108 hb_face_destroy (face_abc);
109 hb_face_destroy (face_ac);
110 }
111
112 static void
113 test_subset_hmtx_decrease_num_metrics (void)
114 {
115 hb_face_t *face_abc = hb_test_open_font_file ("fonts/Inconsolata-Regular.abc.widerc.ttf");
116 hb_face_t *face_ab = hb_test_open_font_file ("fonts/Inconsolata-Regular.ab.ttf");
117
118 hb_set_t *codepoints = hb_set_create ();
119 hb_face_t *face_abc_subset;
120 hb_set_add (codepoints, 'a');
121 hb_set_add (codepoints, 'b');
122 face_abc_subset = hb_subset_test_create_subset (face_abc, hb_subset_test_create_input (codepoints));
123 hb_set_destroy (codepoints);
124
125 check_num_hmetrics(face_abc_subset, 1); /* everything left has same width */
126 hb_subset_test_check (face_ab, face_abc_subset, HB_TAG ('h','m','t','x'));
127
128 hb_face_destroy (face_abc_subset);
129 hb_face_destroy (face_abc);
130 hb_face_destroy (face_ab);
131 }
132
133 static void
134 test_subset_hmtx_noop (void)
135 {
136 hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");
137
138 hb_set_t *codepoints = hb_set_create();
139 hb_face_t *face_abc_subset;
140 hb_set_add (codepoints, 'a');
141 hb_set_add (codepoints, 'b');
142 hb_set_add (codepoints, 'c');
143 face_abc_subset = hb_subset_test_create_subset (face_abc, hb_subset_test_create_input (codepoints));
144 hb_set_destroy (codepoints);
145
146 check_num_hmetrics(face_abc_subset, 4); /* nothing has same width */
147 hb_subset_test_check (face_abc, face_abc_subset, HB_TAG ('h','m','t','x'));
148
149 hb_face_destroy (face_abc_subset);
150 hb_face_destroy (face_abc);
151 }
152
153 static void
154 test_subset_invalid_hmtx (void)
155 {
156 hb_face_t *face = hb_test_open_font_file ("../fuzzing/fonts/crash-e4e0bb1458a91b692eba492c907ae1f94e635480");
157 hb_face_t *subset;
158
159 hb_subset_input_t *input = hb_subset_input_create_or_fail ();
160 hb_set_t *codepoints = hb_subset_input_unicode_set (input);
161 hb_set_add (codepoints, 'a');
162 hb_set_add (codepoints, 'b');
163 hb_set_add (codepoints, 'c');
164
165 subset = hb_subset_or_fail (face, input);
166 g_assert (!subset);
167
168 hb_subset_input_destroy (input);
169 hb_face_destroy (subset);
170 hb_face_destroy (face);
171 }
172
173 int
174 main (int argc, char **argv)
175 {
176 hb_test_init (&argc, &argv);
177
178 hb_test_add (test_subset_hmtx_simple_subset);
179 hb_test_add (test_subset_hmtx_monospace);
180 hb_test_add (test_subset_hmtx_keep_num_metrics);
181 hb_test_add (test_subset_hmtx_decrease_num_metrics);
182 hb_test_add (test_subset_hmtx_noop);
183 hb_test_add (test_subset_invalid_hmtx);
184
185 return hb_test_run();
186 }