src/hb-shape.cc

   1 /*
   2  * Copyright © 2009  Red Hat, Inc.
   3  *
   4  *  This is part of HarfBuzz, a text shaping library.
   5  *
   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.
  11  *
  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
  16  * DAMAGE.
  17  *
  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.
  23  *
  24  * Red Hat Author(s): Behdad Esfahbod
  25  */
  26
  27 #include "hb-private.hh"
  28
  29 #include "hb-shaper-private.hh"
  30 #include "hb-shape-plan-private.hh"
  31 #include "hb-buffer-private.hh"
  32 #include "hb-font-private.hh"
  33
  34
  35 static const char **static_shaper_list;
  36
  37 static
  38 void free_static_shaper_list (void)
  39 {
  40   free (static_shaper_list);
  41 }
  42
  43 const char **
  44 hb_shape_list_shapers (void)
  45 {
  46 retry:
  47   const char **shaper_list = (const char **) hb_atomic_ptr_get (&static_shaper_list);
  48
  49   if (unlikely (!shaper_list))
  50   {
  51     /* Not found; allocate one. */
  52     shaper_list = (const char **) calloc (1 + HB_SHAPERS_COUNT, sizeof (const char *));
  53     if (unlikely (!shaper_list)) {
  54       static const char *nil_shaper_list[] = {NULL};
  55       return nil_shaper_list;
  56     }
  57
  58     const hb_shaper_pair_t *shapers = _hb_shapers_get ();
  59     unsigned int i;
  60     for (i = 0; i < HB_SHAPERS_COUNT; i++)
  61       shaper_list[i] = shapers[i].name;
  62     shaper_list[i] = NULL;
  63
  64     if (!hb_atomic_ptr_cmpexch (&static_shaper_list, NULL, shaper_list)) {
  65       free (shaper_list);
  66       goto retry;
  67     }
  68
  69 #ifdef HAVE_ATEXIT
  70     atexit (free_static_shaper_list); /* First person registers atexit() callback. */
  71 #endif
  72   }
  73
  74   return shaper_list;
  75 }
  76
  77
  78 hb_bool_t
  79 hb_shape_full (hb_font_t          *font,
  80                hb_buffer_t        *buffer,
  81                const hb_feature_t *features,
  82                unsigned int        num_features,
  83                const char * const *shaper_list)
  84 {
  85   if (unlikely (!buffer->len))
  86     return true;
  87
  88   buffer->guess_properties ();
  89
  90   hb_shape_plan_t *shape_plan = hb_shape_plan_create_cached (font->face, &buffer->props, features, num_features, shaper_list);
  91   hb_bool_t res = hb_shape_plan_execute (shape_plan, font, buffer, features, num_features);
  92   hb_shape_plan_destroy (shape_plan);
  93   return res;
  94 }
  95
  96 void
  97 hb_shape (hb_font_t           *font,
  98           hb_buffer_t         *buffer,
  99           const hb_feature_t  *features,
 100           unsigned int         num_features)
 101 {
 102   hb_shape_full (font, buffer, features, num_features, NULL);
 103 }