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