1 /*

     2  * Copyright © 2009  Red Hat, Inc.

     3  * Copyright © 2011  Google, Inc.

     4  *

     5  *  This is part of HarfBuzz, a text shaping library.

     6  *

     7  * Permission is hereby granted, without written agreement and without

     8  * license or royalty fees, to use, copy, modify, and distribute this

     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 #ifndef HB_FACE_HH

    30 #define HB_FACE_HH

    31 

    32 #include "hb.hh"

    33 

    34 #include "hb-shaper.hh"

    35 #include "hb-shape-plan.hh"

    36 #include "hb-ot-face.hh"

    37 

    38 

    39 /*

    40  * hb_face_t

    41  */

    42 

    43 #define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_INSTANTIATE_SHAPERS(shaper, face);

    44 #include "hb-shaper-list.hh"

    45 #undef HB_SHAPER_IMPLEMENT

    46 

    47 struct hb_face_t

    48 {

    49   hb_object_header_t header;

    50 

    51   hb_reference_table_func_t  reference_table_func;

    52   void                      *user_data;

    53   hb_destroy_func_t          destroy;

    54 

    55   unsigned int index;                   /* Face index in a collection, zero-based. */

    56   mutable hb_atomic_int_t upem;         /* Units-per-EM. */

    57   mutable hb_atomic_int_t num_glyphs;   /* Number of glyphs. */

    58 

    59   hb_shaper_object_dataset_t<hb_face_t> data;/* Various shaper data. */

    60   hb_ot_face_t table;                   /* All the face's tables. */

    61 

    62   /* Cache */

    63   struct plan_node_t

    64   {

    65     hb_shape_plan_t *shape_plan;

    66     plan_node_t *next;

    67   };

    68   hb_atomic_ptr_t<plan_node_t> shape_plans;

    69 

    70   hb_blob_t *reference_table (hb_tag_t tag) const

    71   {

    72     hb_blob_t *blob;

    73 

    74     if (unlikely (!reference_table_func))

    75       return hb_blob_get_empty ();

    76 

    77     blob = reference_table_func (/*XXX*/const_cast<hb_face_t *> (this), tag, user_data);

    78     if (unlikely (!blob))

    79       return hb_blob_get_empty ();

    80 

    81     return blob;

    82   }

    83 

    84   HB_PURE_FUNC unsigned int get_upem () const

    85   {

    86     unsigned int ret = upem.get_relaxed ();

    87     if (unlikely (!ret))

    88     {

    89       return load_upem ();

    90     }

    91     return ret;

    92   }

    93 

    94   unsigned int get_num_glyphs () const

    95   {

    96     unsigned int ret = num_glyphs.get_relaxed ();

    97     if (unlikely (ret == (unsigned int) -1))

    98       return load_num_glyphs ();

    99     return ret;

   100   }

   101 

   102   private:

   103   HB_INTERNAL unsigned int load_upem () const;

   104   HB_INTERNAL unsigned int load_num_glyphs () const;

   105 };

   106 DECLARE_NULL_INSTANCE (hb_face_t);

   107 

   108 

   109 #endif /* HB_FACE_HH */