diff options
Diffstat (limited to '')
-rw-r--r-- | gfx/harfbuzz/src/hb-shaper.cc | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-shaper.cc b/gfx/harfbuzz/src/hb-shaper.cc new file mode 100644 index 0000000000..c4885cda94 --- /dev/null +++ b/gfx/harfbuzz/src/hb-shaper.cc @@ -0,0 +1,102 @@ +/* + * 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; + + hb_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 (); +} |