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 hb-subset-glyf.h */
31
32 static void check_maxp_field (uint8_t *raw_maxp, unsigned int offset, uint16_t expected_value)
33 {
34 uint16_t actual_value = (raw_maxp[offset] << 8) + raw_maxp[offset + 1];
35 g_assert_cmpuint(expected_value, ==, actual_value);
36 }
37
38 static void check_maxp_num_glyphs (hb_face_t *face, uint16_t expected_num_glyphs, bool hints)
39 {
40 hb_blob_t *maxp_blob = hb_face_reference_table (face, HB_TAG ('m','a','x', 'p'));
41
42 unsigned int maxp_len;
43 uint8_t *raw_maxp = (uint8_t *) hb_blob_get_data(maxp_blob, &maxp_len);
44
45 check_maxp_field (raw_maxp, 4, expected_num_glyphs); // numGlyphs
46 if (!hints)
47 {
48 check_maxp_field (raw_maxp, 14, 1); // maxZones
49 check_maxp_field (raw_maxp, 16, 0); // maxTwilightPoints
50 check_maxp_field (raw_maxp, 18, 0); // maxStorage
51 check_maxp_field (raw_maxp, 20, 0); // maxFunctionDefs
52 check_maxp_field (raw_maxp, 22, 0); // maxInstructionDefs
53 check_maxp_field (raw_maxp, 24, 0); // maxStackElements
54 check_maxp_field (raw_maxp, 26, 0); // maxSizeOfInstructions
55 }
56
57 hb_blob_destroy (maxp_blob);
58 }
59
60 static void
61 test_subset_glyf (void)
62 {
63 hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");
64 hb_face_t *face_ac = hb_test_open_font_file ("fonts/Roboto-Regular.ac.ttf");
65
66 hb_set_t *codepoints = hb_set_create();
67 hb_face_t *face_abc_subset;
68 hb_set_add (codepoints, 97);
69 hb_set_add (codepoints, 99);
70 face_abc_subset = hb_subset_test_create_subset (face_abc, hb_subset_test_create_input (codepoints));
71 hb_set_destroy (codepoints);
72
73 check_maxp_num_glyphs(face_abc_subset, 3, true);
74 hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('l','o','c', 'a'));
75 hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('g','l','y','f'));
76
77 hb_face_destroy (face_abc_subset);
78 hb_face_destroy (face_abc);
79 hb_face_destroy (face_ac);
80 }
81
82 static void
83 test_subset_glyf_set_overlaps_flag (void)
84 {
85 hb_face_t *face_abcAE = hb_test_open_font_file ("fonts/Roboto-Regular.abcAE.ttf");
86 hb_face_t *face_bAE = hb_test_open_font_file ("fonts/Roboto-Regular.bAE.ttf");
87
88 hb_set_t *codepoints = hb_set_create();
89 hb_face_t *face_abcAE_subset;
90 hb_set_add (codepoints, 32);
91 hb_set_add (codepoints, 98);
92 hb_set_add (codepoints, 508);
93
94 hb_subset_input_t* input = hb_subset_test_create_input (codepoints);
95 hb_subset_input_set_flags (input, HB_SUBSET_FLAGS_SET_OVERLAPS_FLAG);
96 face_abcAE_subset = hb_subset_test_create_subset (face_abcAE, input);
97 hb_set_destroy (codepoints);
98
99 hb_subset_test_check (face_bAE, face_abcAE_subset, HB_TAG ('l','o','c', 'a'));
100 hb_subset_test_check (face_bAE, face_abcAE_subset, HB_TAG ('g','l','y','f'));
101
102 hb_face_destroy (face_abcAE_subset);
103 hb_face_destroy (face_abcAE);
104 hb_face_destroy (face_bAE);
105 }
106
107 static void
108 test_subset_glyf_with_input_glyphs (void)
109 {
110 hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");
111 hb_face_t *face_ac = hb_test_open_font_file ("fonts/Roboto-Regular.ac.ttf");
112
113 hb_set_t *glyphs = hb_set_create();
114 hb_face_t *face_abc_subset;
115 hb_set_add (glyphs, 1);
116 hb_set_add (glyphs, 3);
117 face_abc_subset =
118 hb_subset_test_create_subset (face_abc, hb_subset_test_create_input_from_glyphs (glyphs));
119 hb_set_destroy (glyphs);
120
121 hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('g','l','y','f'));
122 hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('l','o','c', 'a'));
123 check_maxp_num_glyphs(face_abc_subset, 3, true);
124
125 hb_face_destroy (face_abc_subset);
126 hb_face_destroy (face_abc);
127 hb_face_destroy (face_ac);
128 }
129
130 static void
131 test_subset_glyf_with_components (void)
132 {
133 hb_face_t *face_components = hb_test_open_font_file ("fonts/Roboto-Regular.components.ttf");
134 hb_face_t *face_subset = hb_test_open_font_file ("fonts/Roboto-Regular.components.subset.ttf");
135
136 hb_set_t *codepoints = hb_set_create();
137 hb_face_t *face_generated_subset;
138 hb_set_add (codepoints, 0x1fc);
139 face_generated_subset = hb_subset_test_create_subset (face_components, hb_subset_test_create_input (codepoints));
140 hb_set_destroy (codepoints);
141
142 hb_subset_test_check (face_subset, face_generated_subset, HB_TAG ('g','l','y','f'));
143 hb_subset_test_check (face_subset, face_generated_subset, HB_TAG ('l','o','c', 'a'));
144 check_maxp_num_glyphs(face_generated_subset, 4, true);
145
146 hb_face_destroy (face_generated_subset);
147 hb_face_destroy (face_subset);
148 hb_face_destroy (face_components);
149 }
150
151 static void
152 test_subset_glyf_with_gsub (void)
153 {
154 hb_face_t *face_fil = hb_test_open_font_file ("fonts/Roboto-Regular.gsub.fil.ttf");
155 hb_face_t *face_fi = hb_test_open_font_file ("fonts/Roboto-Regular.gsub.fi.ttf");
156 hb_subset_input_t *input;
157 hb_face_t *face_subset;
158
159 hb_set_t *codepoints = hb_set_create();
160 hb_set_add (codepoints, 102); // f
161 hb_set_add (codepoints, 105); // i
162
163 input = hb_subset_test_create_input (codepoints);
164 hb_set_destroy (codepoints);
165 hb_set_del (hb_subset_input_set (input, HB_SUBSET_SETS_DROP_TABLE_TAG), HB_TAG('G', 'S', 'U', 'B'));
166 hb_set_del (hb_subset_input_set (input, HB_SUBSET_SETS_DROP_TABLE_TAG), HB_TAG('G', 'P', 'O', 'S'));
167 hb_set_del (hb_subset_input_set (input, HB_SUBSET_SETS_DROP_TABLE_TAG), HB_TAG('G', 'D', 'E', 'F'));
168
169 face_subset = hb_subset_test_create_subset (face_fil, input);
170
171 hb_subset_test_check (face_fi, face_subset, HB_TAG ('g','l','y','f'));
172 hb_subset_test_check (face_fi, face_subset, HB_TAG ('l','o','c', 'a'));
173 check_maxp_num_glyphs(face_subset, 5, true);
174
175 hb_face_destroy (face_subset);
176 hb_face_destroy (face_fi);
177 hb_face_destroy (face_fil);
178 }
179
180 static void
181 test_subset_glyf_without_gsub (void)
182 {
183 hb_face_t *face_fil = hb_test_open_font_file ("fonts/Roboto-Regular.gsub.fil.ttf");
184 hb_face_t *face_fi = hb_test_open_font_file ("fonts/Roboto-Regular.nogsub.fi.ttf");
185 hb_subset_input_t *input;
186 hb_face_t *face_subset;
187
188 hb_set_t *codepoints = hb_set_create();
189 hb_set_add (codepoints, 102); // f
190 hb_set_add (codepoints, 105); // i
191
192 input = hb_subset_test_create_input (codepoints);
193 hb_set_destroy (codepoints);
194 hb_set_add (hb_subset_input_set (input, HB_SUBSET_SETS_DROP_TABLE_TAG), HB_TAG('G', 'S', 'U', 'B'));
195 hb_set_add (hb_subset_input_set (input, HB_SUBSET_SETS_DROP_TABLE_TAG), HB_TAG('G', 'P', 'O', 'S'));
196 hb_set_add (hb_subset_input_set (input, HB_SUBSET_SETS_DROP_TABLE_TAG), HB_TAG('G', 'D', 'E', 'F'));
197
198 face_subset = hb_subset_test_create_subset (face_fil, input);
199
200 hb_subset_test_check (face_fi, face_subset, HB_TAG ('g','l','y','f'));
201 hb_subset_test_check (face_fi, face_subset, HB_TAG ('l','o','c', 'a'));
202 check_maxp_num_glyphs(face_subset, 3, true);
203
204 hb_face_destroy (face_subset);
205 hb_face_destroy (face_fi);
206 hb_face_destroy (face_fil);
207 }
208
209 static void
210 test_subset_glyf_noop (void)
211 {
212 hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");
213
214 hb_set_t *codepoints = hb_set_create();
215 hb_face_t *face_abc_subset;
216 hb_set_add (codepoints, 97);
217 hb_set_add (codepoints, 98);
218 hb_set_add (codepoints, 99);
219 face_abc_subset = hb_subset_test_create_subset (face_abc, hb_subset_test_create_input (codepoints));
220 hb_set_destroy (codepoints);
221
222 check_maxp_num_glyphs(face_abc_subset, 4, true);
223 hb_subset_test_check (face_abc, face_abc_subset, HB_TAG ('l','o','c', 'a'));
224 hb_subset_test_check (face_abc, face_abc_subset, HB_TAG ('g','l','y','f'));
225
226 hb_face_destroy (face_abc_subset);
227 hb_face_destroy (face_abc);
228 }
229
230 static void
231 test_subset_glyf_strip_hints_simple (void)
232 {
233 hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");
234 hb_face_t *face_ac = hb_test_open_font_file ("fonts/Roboto-Regular.ac.nohints.ttf");
235
236 hb_set_t *codepoints = hb_set_create();
237 hb_subset_input_t *input;
238 hb_face_t *face_abc_subset;
239 hb_set_add (codepoints, 'a');
240 hb_set_add (codepoints, 'c');
241 input = hb_subset_test_create_input (codepoints);
242 hb_subset_input_set_flags (input, HB_SUBSET_FLAGS_NO_HINTING);
243 face_abc_subset = hb_subset_test_create_subset (face_abc, input);
244 hb_set_destroy (codepoints);
245
246 check_maxp_num_glyphs(face_abc_subset, 3, false);
247 hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('l','o','c', 'a'));
248 hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('g','l','y','f'));
249
250 hb_face_destroy (face_abc_subset);
251 hb_face_destroy (face_abc);
252 hb_face_destroy (face_ac);
253 }
254
255 static void
256 test_subset_glyf_strip_hints_composite (void)
257 {
258 hb_face_t *face_components = hb_test_open_font_file ("fonts/Roboto-Regular.components.ttf");
259 hb_face_t *face_subset = hb_test_open_font_file ("fonts/Roboto-Regular.components.1fc.nohints.ttf");
260
261 hb_set_t *codepoints = hb_set_create();
262 hb_subset_input_t *input;
263 hb_face_t *face_generated_subset;
264 hb_set_add (codepoints, 0x1fc);
265 input = hb_subset_test_create_input (codepoints);
266 hb_subset_input_set_flags (input, HB_SUBSET_FLAGS_NO_HINTING);
267
268 face_generated_subset = hb_subset_test_create_subset (face_components, input);
269 hb_set_destroy (codepoints);
270
271 check_maxp_num_glyphs(face_generated_subset, 4, false);
272 hb_subset_test_check (face_subset, face_generated_subset, HB_TAG ('l','o','c', 'a'));
273 hb_subset_test_check (face_subset, face_generated_subset, HB_TAG ('g','l','y','f'));
274
275 hb_face_destroy (face_generated_subset);
276 hb_face_destroy (face_subset);
277 hb_face_destroy (face_components);
278 }
279
280 static void
281 test_subset_glyf_strip_hints_invalid (void)
282 {
283 hb_face_t *face = hb_test_open_font_file ("../fuzzing/fonts/oom-ccc61c92d589f895174cdef6ff2e3b20e9999a1a");
284
285 hb_set_t *codepoints = hb_set_create();
286 const hb_codepoint_t text[] =
287 {
288 'A', 'B', 'C', 'D', 'E', 'X', 'Y', 'Z', '1', '2',
289 '3', '@', '_', '%', '&', ')', '*', '$', '!'
290 };
291 unsigned int i;
292 hb_subset_input_t *input;
293 hb_face_t *face_subset;
294
295 for (i = 0; i < sizeof (text) / sizeof (hb_codepoint_t); i++)
296 {
297 hb_set_add (codepoints, text[i]);
298 }
299
300 input = hb_subset_test_create_input (codepoints);
301 hb_subset_input_set_flags (input, HB_SUBSET_FLAGS_NO_HINTING);
302 hb_set_destroy (codepoints);
303
304 face_subset = hb_subset_or_fail (face, input);
305 g_assert (!face_subset);
306
307 hb_subset_input_destroy (input);
308 hb_face_destroy (face);
309 }
310
311 static void
312 test_subset_glyf_retain_gids (void)
313 {
314 hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");
315 hb_face_t *face_ac = hb_test_open_font_file ("fonts/Roboto-Regular.ac.retaingids.ttf");
316
317 hb_set_t *codepoints = hb_set_create();
318 hb_face_t *face_abc_subset;
319 hb_set_add (codepoints, 97);
320 hb_set_add (codepoints, 99);
321
322 hb_subset_input_t *input = hb_subset_test_create_input (codepoints);
323 hb_subset_input_set_flags (input, HB_SUBSET_FLAGS_RETAIN_GIDS);
324 face_abc_subset = hb_subset_test_create_subset (face_abc, input);
325 hb_set_destroy (codepoints);
326
327 check_maxp_num_glyphs(face_abc_subset, 4, true);
328 hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('l','o','c', 'a'));
329 hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('g','l','y','f'));
330
331 hb_face_destroy (face_abc_subset);
332 hb_face_destroy (face_abc);
333 hb_face_destroy (face_ac);
334 }
335
336 static void
337 test_subset_glyf_retain_gids_truncates (void)
338 {
339 hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");
340 hb_face_t *face_a = hb_test_open_font_file ("fonts/Roboto-Regular.a.retaingids.ttf");
341
342 hb_set_t *codepoints = hb_set_create();
343 hb_face_t *face_abc_subset;
344 hb_set_add (codepoints, 97);
345
346 hb_subset_input_t *input = hb_subset_test_create_input (codepoints);
347 hb_subset_input_set_flags (input, HB_SUBSET_FLAGS_RETAIN_GIDS);
348 face_abc_subset = hb_subset_test_create_subset (face_abc, input);
349 hb_set_destroy (codepoints);
350
351 check_maxp_num_glyphs(face_abc_subset, 2, true);
352 hb_subset_test_check (face_a, face_abc_subset, HB_TAG ('l','o','c', 'a'));
353 hb_subset_test_check (face_a, face_abc_subset, HB_TAG ('g','l','y','f'));
354
355 hb_face_destroy (face_abc_subset);
356 hb_face_destroy (face_abc);
357 hb_face_destroy (face_a);
358 }
359
360 #ifdef HB_EXPERIMENTAL_API
361 static void
362 test_subset_glyf_iftb_requirements (void)
363 {
364 hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Variable.abc.ttf");
365 hb_face_t *face_long_loca = hb_test_open_font_file ("fonts/Roboto-Variable.abc.long_loca.ttf");
366
367 hb_set_t *codepoints = hb_set_create();
368 hb_face_t *face_abc_subset;
369 hb_set_add (codepoints, 97);
370 hb_set_add (codepoints, 98);
371 hb_set_add (codepoints, 99);
372
373 hb_subset_input_t *input = hb_subset_test_create_input (codepoints);
374 hb_subset_input_set_flags (input, HB_SUBSET_FLAGS_IFTB_REQUIREMENTS);
375 face_abc_subset = hb_subset_test_create_subset (face_abc, input);
376 hb_set_destroy (codepoints);
377
378 hb_subset_test_check (face_long_loca, face_abc_subset, HB_TAG ('l','o','c', 'a'));
379 hb_subset_test_check (face_long_loca, face_abc_subset, HB_TAG ('g','l','y','f'));
380 hb_subset_test_check (face_long_loca, face_abc_subset, HB_TAG ('g','v','a','r'));
381
382 hb_face_destroy (face_abc_subset);
383 hb_face_destroy (face_abc);
384 hb_face_destroy (face_long_loca);
385
386 }
387 #endif
388
389 // TODO(grieger): test for long loca generation.
390
391 int
392 main (int argc, char **argv)
393 {
394 hb_test_init (&argc, &argv);
395
396 hb_test_add (test_subset_glyf_noop);
397 hb_test_add (test_subset_glyf);
398 hb_test_add (test_subset_glyf_set_overlaps_flag);
399 hb_test_add (test_subset_glyf_with_input_glyphs);
400 hb_test_add (test_subset_glyf_strip_hints_simple);
401 hb_test_add (test_subset_glyf_strip_hints_composite);
402 hb_test_add (test_subset_glyf_strip_hints_invalid);
403 hb_test_add (test_subset_glyf_with_components);
404 hb_test_add (test_subset_glyf_with_gsub);
405 hb_test_add (test_subset_glyf_without_gsub);
406 hb_test_add (test_subset_glyf_retain_gids);
407 hb_test_add (test_subset_glyf_retain_gids_truncates);
408
409 #ifdef HB_EXPERIMENTAL_API
410 hb_test_add (test_subset_glyf_iftb_requirements);
411 #endif
412
413 return hb_test_run();
414 }