112 lines
2.9 KiB
C++
112 lines
2.9 KiB
C++
/*
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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.hh"
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#include "hb-shaper.hh"
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#include "hb-machinery.hh"
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static const hb_shaper_entry_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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#ifdef HB_USE_ATEXIT
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static void free_static_shapers (void);
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#endif
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static struct hb_shapers_lazy_loader_t : hb_lazy_loader_t<const hb_shaper_entry_t,
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hb_shapers_lazy_loader_t>
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{
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static inline hb_shaper_entry_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_entry_t *shapers = (hb_shaper_entry_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_entry_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_entry_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_entry_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_entry_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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