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_PRIVATE_HH

    30 #define HB_FACE_PRIVATE_HH

    31 

    32 #include "hb-private.hh"

    33 

    34 #include "hb-object-private.hh"

    35 #include "hb-shaper-private.hh"

    36 #include "hb-shape-plan-private.hh"

    37 

    38 

    39 /*

    40  * hb_face_t

    41  */

    42 

    43 struct hb_face_t {

    44   hb_object_header_t header;

    45   ASSERT_POD ();

    46 

    47   hb_bool_t immutable;

    48 

    49   hb_reference_table_func_t  reference_table_func;

    50   void                      *user_data;

    51   hb_destroy_func_t          destroy;

    52 

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

    54   mutable unsigned int upem;            /* Units-per-EM. */

    55   mutable unsigned int num_glyphs;      /* Number of glyphs. */

    56 

    57   struct hb_shaper_data_t shaper_data;  /* Various shaper data. */

    58 

    59   /* Various non-shaping data. */

    60   /* ... */

    61 

    62   /* Cache */

    63   struct plan_node_t {

    64     hb_shape_plan_t *shape_plan;

    65     plan_node_t *next;

    66   } *shape_plans;

    67 

    68 

    69   inline hb_blob_t *reference_table (hb_tag_t tag) const

    70   {

    71     hb_blob_t *blob;

    72 

    73     if (unlikely (!reference_table_func))

    74       return hb_blob_get_empty ();

    75 

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

    77     if (unlikely (!blob))

    78       return hb_blob_get_empty ();

    79 

    80     return blob;

    81   }

    82 

    83   inline HB_PURE_FUNC unsigned int get_upem (void) const

    84   {

    85     if (unlikely (!upem))

    86       load_upem ();

    87     return upem;

    88   }

    89 

    90   inline unsigned int get_num_glyphs (void) const

    91   {

    92     if (unlikely (num_glyphs == (unsigned int) -1))

    93       load_num_glyphs ();

    94     return num_glyphs;

    95   }

    96 

    97   private:

    98   HB_INTERNAL void load_upem (void) const;

    99   HB_INTERNAL void load_num_glyphs (void) const;

   100 };

   101 

   102 extern HB_INTERNAL const hb_face_t _hb_face_nil;

   103 

   104 #define HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS

   105 #define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_PROTOTYPE(shaper, face);

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

   107 #undef HB_SHAPER_IMPLEMENT

   108 #undef HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS

   109 

   110 

   111 #endif /* HB_FACE_PRIVATE_HH */