9  * software and its documentation for any purpose, provided that the
  10  * above copyright notice and the following two paragraphs appear in
  11  * all copies of this software.
  12  *
  13  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
  14  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  15  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
  16  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
  17  * DAMAGE.
  18  *
  19  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
  20  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  21  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  22  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
  23  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  24  *
  25  * Red Hat Author(s): Behdad Esfahbod
  26  * Google Author(s): Behdad Esfahbod
  27  */
  28 
  29 #include "hb-private.hh"






  30 
  31 #include "hb-shaper-private.hh"
  32 #include "hb-shape-plan-private.hh"
  33 #include "hb-buffer-private.hh"
  34 #include "hb-font-private.hh"
  35 
  36 /**
  37  * SECTION:hb-shape
  38  * @title: Shaping
  39  * @short_description: Conversion of text strings into positioned glyphs
  40  * @include: hb.h
  41  *
  42  * Shaping is the central operation of HarfBuzz. Shaping operates on buffers,
  43  * which are sequences of Unicode characters that use the same font and have
  44  * the same text direction, script and language. After shaping the buffer
  45  * contains the output glyphs and their positions.
  46  **/
  47 
  48 static const char **static_shaper_list;
  49 
  50 #ifdef HB_USE_ATEXIT
  51 static
  52 void free_static_shaper_list (void)





  53 {
  54 retry:
  55   const char **shaper_list = (const char **) hb_atomic_ptr_get (&static_shaper_list);
  56   if (!hb_atomic_ptr_cmpexch (&static_shaper_list, shaper_list, nullptr))
  57     goto retry;











  58 
  59   free (shaper_list);












  60 }
  61 #endif
  62 

  63 /**
  64  * hb_shape_list_shapers:
  65  *
  66  * Retrieves the list of shapers supported by HarfBuzz.
  67  *
  68  * Return value: (transfer none) (array zero-terminated=1): an array of
  69  *    constant strings
  70  *
  71  * Since: 0.9.2
  72  **/
  73 const char **
  74 hb_shape_list_shapers (void)
  75 {
  76 retry:
  77   const char **shaper_list = (const char **) hb_atomic_ptr_get (&static_shaper_list);
  78 
  79   if (unlikely (!shaper_list))
  80   {
  81     /* Not found; allocate one. */
  82     shaper_list = (const char **) calloc (1 + HB_SHAPERS_COUNT, sizeof (const char *));
  83     if (unlikely (!shaper_list)) {
  84       static const char *nil_shaper_list[] = {nullptr};
  85       return nil_shaper_list;
  86     }
  87 
  88     const hb_shaper_pair_t *shapers = _hb_shapers_get ();
  89     unsigned int i;
  90     for (i = 0; i < HB_SHAPERS_COUNT; i++)
  91       shaper_list[i] = shapers[i].name;
  92     shaper_list[i] = nullptr;
  93 
  94     if (!hb_atomic_ptr_cmpexch (&static_shaper_list, nullptr, shaper_list)) {
  95       free (shaper_list);
  96       goto retry;
  97     }
  98 
  99 #ifdef HB_USE_ATEXIT
 100     atexit (free_static_shaper_list); /* First person registers atexit() callback. */
 101 #endif
 102   }
 103 
 104   return shaper_list;
 105 }
 106 
 107 
 108 /**
 109  * hb_shape_full:
 110  * @font: an #hb_font_t to use for shaping
 111  * @buffer: an #hb_buffer_t to shape
 112  * @features: (array length=num_features) (allow-none): an array of user
 113  *    specified #hb_feature_t or %NULL
 114  * @num_features: the length of @features array
 115  * @shaper_list: (array zero-terminated=1) (allow-none): a %NULL-terminated
 116  *    array of shapers to use or %NULL
 117  *
 118  * See hb_shape() for details. If @shaper_list is not %NULL, the specified
 119  * shapers will be used in the given order, otherwise the default shapers list
 120  * will be used.
 121  *
 122  * Return value: false if all shapers failed, true otherwise
 123  *
 124  * Since: 0.9.2

   9  * software and its documentation for any purpose, provided that the
  10  * above copyright notice and the following two paragraphs appear in
  11  * all copies of this software.
  12  *
  13  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
  14  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  15  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
  16  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
  17  * DAMAGE.
  18  *
  19  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
  20  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  21  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  22  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
  23  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  24  *
  25  * Red Hat Author(s): Behdad Esfahbod
  26  * Google Author(s): Behdad Esfahbod
  27  */
  28 
  29 #include "hb.hh"
  30 
  31 #include "hb-shaper.hh"
  32 #include "hb-shape-plan.hh"
  33 #include "hb-buffer.hh"
  34 #include "hb-font.hh"
  35 #include "hb-machinery.hh"
  36 




  37 
  38 /**
  39  * SECTION:hb-shape
  40  * @title: hb-shape
  41  * @short_description: Conversion of text strings into positioned glyphs
  42  * @include: hb.h
  43  *
  44  * Shaping is the central operation of HarfBuzz. Shaping operates on buffers,
  45  * which are sequences of Unicode characters that use the same font and have
  46  * the same text direction, script, and language. After shaping the buffer
  47  * contains the output glyphs and their positions.
  48  **/
  49 

  50 
  51 #if HB_USE_ATEXIT
  52 static void free_static_shaper_list ();
  53 #endif
  54 
  55 static const char *nil_shaper_list[] = {nullptr};
  56 
  57 static struct hb_shaper_list_lazy_loader_t : hb_lazy_loader_t<const char *,
  58                                                               hb_shaper_list_lazy_loader_t>
  59 {
  60   static const char ** create ()
  61   {
  62     const char **shaper_list = (const char **) calloc (1 + HB_SHAPERS_COUNT, sizeof (const char *));
  63     if (unlikely (!shaper_list))
  64       return nullptr;
  65 
  66     const hb_shaper_entry_t *shapers = _hb_shapers_get ();
  67     unsigned int i;
  68     for (i = 0; i < HB_SHAPERS_COUNT; i++)
  69       shaper_list[i] = shapers[i].name;
  70     shaper_list[i] = nullptr;
  71 
  72 #if HB_USE_ATEXIT
  73     atexit (free_static_shaper_list);
  74 #endif
  75 
  76     return shaper_list;
  77   }
  78   static void destroy (const char **l)
  79   { free (l); }
  80   static const char ** get_null ()
  81   { return nil_shaper_list; }
  82 } static_shaper_list;
  83 
  84 #if HB_USE_ATEXIT
  85 static
  86 void free_static_shaper_list ()
  87 {
  88   static_shaper_list.free_instance ();
  89 }
  90 #endif
  91 
  92 
  93 /**
  94  * hb_shape_list_shapers:
  95  *
  96  * Retrieves the list of shapers supported by HarfBuzz.
  97  *
  98  * Return value: (transfer none) (array zero-terminated=1): an array of
  99  *    constant strings
 100  *
 101  * Since: 0.9.2
 102  **/
 103 const char **
 104 hb_shape_list_shapers ()
 105 {
 106   return static_shaper_list.get_unconst ();




























 107 }
 108 
 109 
 110 /**
 111  * hb_shape_full:
 112  * @font: an #hb_font_t to use for shaping
 113  * @buffer: an #hb_buffer_t to shape
 114  * @features: (array length=num_features) (allow-none): an array of user
 115  *    specified #hb_feature_t or %NULL
 116  * @num_features: the length of @features array
 117  * @shaper_list: (array zero-terminated=1) (allow-none): a %NULL-terminated
 118  *    array of shapers to use or %NULL
 119  *
 120  * See hb_shape() for details. If @shaper_list is not %NULL, the specified
 121  * shapers will be used in the given order, otherwise the default shapers list
 122  * will be used.
 123  *
 124  * Return value: false if all shapers failed, true otherwise
 125  *
 126  * Since: 0.9.2