| /* |
| * Copyright © 2012 Google, Inc. |
| * |
| * This is part of HarfBuzz, a text shaping library. |
| * |
| * Permission is hereby granted, without written agreement and without |
| * license or royalty fees, to use, copy, modify, and distribute this |
| * software and its documentation for any purpose, provided that the |
| * above copyright notice and the following two paragraphs appear in |
| * all copies of this software. |
| * |
| * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
| * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
| * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
| * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
| * DAMAGE. |
| * |
| * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
| * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
| * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
| * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
| * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
| * |
| * Google Author(s): Behdad Esfahbod |
| */ |
| |
| #include "hb.hh" |
| #include "hb-shaper.hh" |
| #include "hb-machinery.hh" |
| |
| |
| static const hb_shaper_entry_t _hb_all_shapers[] = { |
| #define HB_SHAPER_IMPLEMENT(name) {#name, _hb_##name##_shape}, |
| #include "hb-shaper-list.hh" |
| #undef HB_SHAPER_IMPLEMENT |
| }; |
| #ifndef HB_NO_SHAPER |
| static_assert (0 != ARRAY_LENGTH_CONST (_hb_all_shapers), "No shaper enabled."); |
| #endif |
| |
| static inline void free_static_shapers (); |
| |
| static struct hb_shapers_lazy_loader_t : hb_lazy_loader_t<hb_shaper_entry_t, |
| hb_shapers_lazy_loader_t> |
| { |
| static hb_shaper_entry_t *create () |
| { |
| char *env = getenv ("HB_SHAPER_LIST"); |
| if (!env || !*env) |
| return nullptr; |
| |
| hb_shaper_entry_t *shapers = (hb_shaper_entry_t *) hb_calloc (1, sizeof (_hb_all_shapers)); |
| if (unlikely (!shapers)) |
| return nullptr; |
| |
| memcpy (shapers, _hb_all_shapers, sizeof (_hb_all_shapers)); |
| |
| /* Reorder shaper list to prefer requested shapers. */ |
| unsigned int i = 0; |
| char *end, *p = env; |
| for (;;) |
| { |
| end = strchr (p, ','); |
| if (!end) |
| end = p + strlen (p); |
| |
| for (unsigned int j = i; j < ARRAY_LENGTH_CONST (_hb_all_shapers); j++) |
| if (end - p == (int) strlen (shapers[j].name) && |
| 0 == strncmp (shapers[j].name, p, end - p)) |
| { |
| /* Reorder this shaper to position i */ |
| struct hb_shaper_entry_t t = shapers[j]; |
| memmove (&shapers[i + 1], &shapers[i], sizeof (shapers[i]) * (j - i)); |
| shapers[i] = t; |
| i++; |
| } |
| |
| if (!*end) |
| break; |
| else |
| p = end + 1; |
| } |
| |
| hb_atexit (free_static_shapers); |
| |
| return shapers; |
| } |
| static void destroy (hb_shaper_entry_t *p) { hb_free (p); } |
| static const hb_shaper_entry_t *get_null () { return _hb_all_shapers; } |
| } static_shapers; |
| |
| static inline |
| void free_static_shapers () |
| { |
| static_shapers.free_instance (); |
| } |
| |
| const hb_shaper_entry_t * |
| _hb_shapers_get () |
| { |
| return static_shapers.get_unconst (); |
| } |