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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 
check_maxp_field(uint8_t * raw_maxp,unsigned int offset,uint16_t expected_value)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 
check_maxp_num_glyphs(hb_face_t * face,uint16_t expected_num_glyphs,bool hints)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
test_subset_glyf(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   hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('g','l','y','f'));
74   hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('l','o','c', 'a'));
75   check_maxp_num_glyphs(face_abc_subset, 3, true);
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
test_subset_glyf_with_components(void)83 test_subset_glyf_with_components (void)
84 {
85   hb_face_t *face_components = hb_test_open_font_file ("fonts/Roboto-Regular.components.ttf");
86   hb_face_t *face_subset = hb_test_open_font_file ("fonts/Roboto-Regular.components.subset.ttf");
87 
88   hb_set_t *codepoints = hb_set_create();
89   hb_face_t *face_generated_subset;
90   hb_set_add (codepoints, 0x1fc);
91   face_generated_subset = hb_subset_test_create_subset (face_components, hb_subset_test_create_input (codepoints));
92   hb_set_destroy (codepoints);
93 
94   hb_subset_test_check (face_subset, face_generated_subset, HB_TAG ('g','l','y','f'));
95   hb_subset_test_check (face_subset, face_generated_subset, HB_TAG ('l','o','c', 'a'));
96   check_maxp_num_glyphs(face_generated_subset, 4, true);
97 
98   hb_face_destroy (face_generated_subset);
99   hb_face_destroy (face_subset);
100   hb_face_destroy (face_components);
101 }
102 
103 static void
test_subset_glyf_with_gsub(void)104 test_subset_glyf_with_gsub (void)
105 {
106   hb_face_t *face_fil = hb_test_open_font_file ("fonts/Roboto-Regular.gsub.fil.ttf");
107   hb_face_t *face_fi = hb_test_open_font_file ("fonts/Roboto-Regular.gsub.fi.ttf");
108   hb_subset_input_t *input;
109   hb_face_t *face_subset;
110 
111   hb_set_t *codepoints = hb_set_create();
112   hb_set_add (codepoints, 102); // f
113   hb_set_add (codepoints, 105); // i
114 
115   input = hb_subset_test_create_input (codepoints);
116   hb_set_destroy (codepoints);
117   hb_subset_input_set_drop_layout (input, false);
118 
119   face_subset = hb_subset_test_create_subset (face_fil, input);
120 
121   hb_subset_test_check (face_fi, face_subset, HB_TAG ('g','l','y','f'));
122   hb_subset_test_check (face_fi, face_subset, HB_TAG ('l','o','c', 'a'));
123   check_maxp_num_glyphs(face_subset, 5, true);
124 
125   hb_face_destroy (face_subset);
126   hb_face_destroy (face_fi);
127   hb_face_destroy (face_fil);
128 }
129 
130 static void
test_subset_glyf_without_gsub(void)131 test_subset_glyf_without_gsub (void)
132 {
133   hb_face_t *face_fil = hb_test_open_font_file ("fonts/Roboto-Regular.gsub.fil.ttf");
134   hb_face_t *face_fi = hb_test_open_font_file ("fonts/Roboto-Regular.nogsub.fi.ttf");
135   hb_subset_input_t *input;
136   hb_face_t *face_subset;
137 
138   hb_set_t *codepoints = hb_set_create();
139   hb_set_add (codepoints, 102); // f
140   hb_set_add (codepoints, 105); // i
141 
142   input = hb_subset_test_create_input (codepoints);
143   hb_set_destroy (codepoints);
144   hb_subset_input_set_drop_layout (input, true);
145 
146   face_subset = hb_subset_test_create_subset (face_fil, input);
147 
148   hb_subset_test_check (face_fi, face_subset, HB_TAG ('g','l','y','f'));
149   hb_subset_test_check (face_fi, face_subset, HB_TAG ('l','o','c', 'a'));
150   check_maxp_num_glyphs(face_subset, 3, true);
151 
152   hb_face_destroy (face_subset);
153   hb_face_destroy (face_fi);
154   hb_face_destroy (face_fil);
155 }
156 
157 static void
test_subset_glyf_noop(void)158 test_subset_glyf_noop (void)
159 {
160   hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");
161 
162   hb_set_t *codepoints = hb_set_create();
163   hb_face_t *face_abc_subset;
164   hb_set_add (codepoints, 97);
165   hb_set_add (codepoints, 98);
166   hb_set_add (codepoints, 99);
167   face_abc_subset = hb_subset_test_create_subset (face_abc, hb_subset_test_create_input (codepoints));
168   hb_set_destroy (codepoints);
169 
170   hb_subset_test_check (face_abc, face_abc_subset, HB_TAG ('g','l','y','f'));
171   hb_subset_test_check (face_abc, face_abc_subset, HB_TAG ('l','o','c', 'a'));
172   check_maxp_num_glyphs(face_abc_subset, 4, true);
173 
174   hb_face_destroy (face_abc_subset);
175   hb_face_destroy (face_abc);
176 }
177 
178 static void
test_subset_glyf_strip_hints_simple(void)179 test_subset_glyf_strip_hints_simple (void)
180 {
181   hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");
182   hb_face_t *face_ac = hb_test_open_font_file ("fonts/Roboto-Regular.ac.nohints.ttf");
183 
184   hb_set_t *codepoints = hb_set_create();
185   hb_subset_input_t *input;
186   hb_face_t *face_abc_subset;
187   hb_set_add (codepoints, 'a');
188   hb_set_add (codepoints, 'c');
189   input = hb_subset_test_create_input (codepoints);
190   hb_subset_input_set_drop_hints (input, true);
191   face_abc_subset = hb_subset_test_create_subset (face_abc, input);
192   hb_set_destroy (codepoints);
193 
194   hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('l','o','c', 'a'));
195   hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('g','l','y','f'));
196   check_maxp_num_glyphs(face_abc_subset, 3, false);
197 
198   hb_face_destroy (face_abc_subset);
199   hb_face_destroy (face_abc);
200   hb_face_destroy (face_ac);
201 }
202 
203 static void
test_subset_glyf_strip_hints_composite(void)204 test_subset_glyf_strip_hints_composite (void)
205 {
206   hb_face_t *face_components = hb_test_open_font_file ("fonts/Roboto-Regular.components.ttf");
207   hb_face_t *face_subset = hb_test_open_font_file ("fonts/Roboto-Regular.components.1fc.nohints.ttf");
208 
209   hb_set_t *codepoints = hb_set_create();
210   hb_subset_input_t *input;
211   hb_face_t *face_generated_subset;
212   hb_set_add (codepoints, 0x1fc);
213   input = hb_subset_test_create_input (codepoints);
214   hb_subset_input_set_drop_hints (input, true);
215 
216   face_generated_subset = hb_subset_test_create_subset (face_components, input);
217   hb_set_destroy (codepoints);
218 
219   hb_subset_test_check (face_subset, face_generated_subset, HB_TAG ('g','l','y','f'));
220   hb_subset_test_check (face_subset, face_generated_subset, HB_TAG ('l','o','c', 'a'));
221   check_maxp_num_glyphs(face_generated_subset, 4, false);
222 
223   hb_face_destroy (face_generated_subset);
224   hb_face_destroy (face_subset);
225   hb_face_destroy (face_components);
226 }
227 
228 static void
test_subset_glyf_strip_hints_invalid(void)229 test_subset_glyf_strip_hints_invalid (void)
230 {
231   hb_face_t *face = hb_test_open_font_file ("../fuzzing/fonts/oom-ccc61c92d589f895174cdef6ff2e3b20e9999a1a");
232 
233   hb_set_t *codepoints = hb_set_create();
234   const hb_codepoint_t text[] =
235   {
236     'A', 'B', 'C', 'D', 'E', 'X', 'Y', 'Z', '1', '2',
237     '3', '@', '_', '%', '&', ')', '*', '$', '!'
238   };
239   unsigned int i;
240   hb_subset_input_t *input;
241   hb_face_t *face_subset;
242 
243   for (i = 0; i < sizeof (text) / sizeof (hb_codepoint_t); i++)
244   {
245     hb_set_add (codepoints, text[i]);
246   }
247 
248   input = hb_subset_test_create_input (codepoints);
249   hb_subset_input_set_drop_hints (input, true);
250   hb_set_destroy (codepoints);
251 
252   face_subset = hb_subset_test_create_subset (face, input);
253   g_assert (face_subset);
254   g_assert (face_subset == hb_face_get_empty ());
255 
256   hb_face_destroy (face_subset);
257   hb_face_destroy (face);
258 }
259 
260 // TODO(grieger): test for long loca generation.
261 
262 int
main(int argc,char ** argv)263 main (int argc, char **argv)
264 {
265   hb_test_init (&argc, &argv);
266 
267   hb_test_add (test_subset_glyf_noop);
268   hb_test_add (test_subset_glyf);
269   hb_test_add (test_subset_glyf_strip_hints_simple);
270   hb_test_add (test_subset_glyf_strip_hints_composite);
271   hb_test_add (test_subset_glyf_strip_hints_invalid);
272   hb_test_add (test_subset_glyf_with_components);
273   hb_test_add (test_subset_glyf_with_gsub);
274   hb_test_add (test_subset_glyf_without_gsub);
275 
276   return hb_test_run();
277 }
278