2 * Copyright © 2009 Red Hat, Inc.
4 * This is part of HarfBuzz, a text shaping library.
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.
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
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.
24 * Red Hat Author(s): Behdad Esfahbod
27 #include "hb-private.hh"
31 #include "hb-buffer-private.hh"
34 #include "hb-graphite2-private.hh"
37 # include "hb-uniscribe-private.hh"
40 # include "hb-ot-shape-private.hh"
42 #include "hb-fallback-shape-private.hh"
44 typedef hb_bool_t (*hb_shape_func_t) (hb_font_t *font,
46 const hb_feature_t *features,
47 unsigned int num_features);
49 #define HB_SHAPER_IMPLEMENT(name) {#name, _hb_##name##_shape}
50 static const struct hb_shaper_pair_t {
54 /* v--- Add new shapers in the right place here */
56 HB_SHAPER_IMPLEMENT (graphite2),
59 HB_SHAPER_IMPLEMENT (uniscribe),
62 HB_SHAPER_IMPLEMENT (ot),
64 HB_SHAPER_IMPLEMENT (fallback) /* should be last */
66 #undef HB_SHAPER_IMPLEMENT
69 /* Thread-safe, lock-free, shapers */
71 static hb_shaper_pair_t *static_shapers;
74 void free_static_shapers (void)
76 if (unlikely (static_shapers != all_shapers))
77 free (static_shapers);
80 static const hb_shaper_pair_t *
84 hb_shaper_pair_t *shapers = (hb_shaper_pair_t *) hb_atomic_ptr_get (&static_shapers);
86 if (unlikely (!shapers))
88 char *env = getenv ("HB_SHAPER_LIST");
90 hb_atomic_ptr_cmpexch (&static_shapers, NULL, (const hb_shaper_pair_t *) all_shapers);
91 return (const hb_shaper_pair_t *) all_shapers;
94 /* Not found; allocate one. */
95 shapers = (hb_shaper_pair_t *) malloc (sizeof (all_shapers));
96 if (unlikely (!shapers))
97 return (const hb_shaper_pair_t *) all_shapers;
98 memcpy (shapers, all_shapers, sizeof (all_shapers));
100 /* Reorder shaper list to prefer requested shapers. */
104 end = strchr (p, ',');
106 end = p + strlen (p);
108 for (unsigned int j = i; j < ARRAY_LENGTH (all_shapers); j++)
109 if (end - p == (int) strlen (shapers[j].name) &&
110 0 == strncmp (shapers[j].name, p, end - p))
112 /* Reorder this shaper to position i */
113 struct hb_shaper_pair_t t = shapers[j];
114 memmove (&shapers[i + 1], &shapers[i], sizeof (shapers[i]) * (j - i));
125 if (!hb_atomic_ptr_cmpexch (&static_shapers, NULL, shapers)) {
131 atexit (free_static_shapers); /* First person registers atexit() callback. */
139 static const char **static_shaper_list;
142 void free_static_shaper_list (void)
144 free (static_shaper_list);
148 hb_shape_list_shapers (void)
151 const char **shaper_list = (const char **) hb_atomic_ptr_get (&static_shaper_list);
153 if (unlikely (!shaper_list))
155 /* Not found; allocate one. */
156 shaper_list = (const char **) calloc (1 + ARRAY_LENGTH (all_shapers), sizeof (const char *));
157 if (unlikely (!shaper_list)) {
158 static const char *nil_shaper_list[] = {NULL};
159 return nil_shaper_list;
162 const hb_shaper_pair_t *shapers = get_shapers ();
164 for (i = 0; i < ARRAY_LENGTH (all_shapers); i++)
165 shaper_list[i] = shapers[i].name;
166 shaper_list[i] = NULL;
168 if (!hb_atomic_ptr_cmpexch (&static_shaper_list, NULL, shaper_list)) {
174 atexit (free_static_shaper_list); /* First person registers atexit() callback. */
183 hb_shape_full (hb_font_t *font,
185 const hb_feature_t *features,
186 unsigned int num_features,
187 const char * const *shaper_list)
189 hb_font_make_immutable (font); /* So we can safely cache stuff on it */
191 if (likely (!shaper_list)) {
192 const hb_shaper_pair_t *shapers = get_shapers ();
193 for (unsigned int i = 0; i < ARRAY_LENGTH (all_shapers); i++)
194 if (likely (shapers[i].func (font, buffer, features, num_features)))
197 while (*shaper_list) {
198 for (unsigned int i = 0; i < ARRAY_LENGTH (all_shapers); i++)
199 if (0 == strcmp (*shaper_list, all_shapers[i].name)) {
200 if (likely (all_shapers[i].func (font, buffer, features, num_features)))
211 hb_shape (hb_font_t *font,
213 const hb_feature_t *features,
214 unsigned int num_features)
216 hb_shape_full (font, buffer, features, num_features, NULL);