third_party/harfbuzz-ng/src/hb-face-private.hh

   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-font.h"
  35 #include "hb-object-private.hh"
  36 #include "hb-shaper-private.hh"
  37 #include "hb-shape-plan-private.hh"
  38
  39
  40 /*
  41  * hb_face_t
  42  */
  43
  44 struct hb_face_t {
  45   hb_object_header_t header;
  46   ASSERT_POD ();
  47
  48   hb_bool_t immutable;
  49
  50   hb_reference_table_func_t  reference_table_func;
  51   void                      *user_data;
  52   hb_destroy_func_t          destroy;
  53
  54   unsigned int index;
  55   mutable unsigned int upem;
  56   mutable unsigned int num_glyphs;
  57
  58   struct hb_shaper_data_t shaper_data;
  59
  60   struct plan_node_t {
  61     hb_shape_plan_t *shape_plan;
  62     plan_node_t *next;
  63   } *shape_plans;
  64
  65
  66   inline hb_blob_t *reference_table (hb_tag_t tag) const
  67   {
  68     hb_blob_t *blob;
  69
  70     if (unlikely (!this || !reference_table_func))
  71       return hb_blob_get_empty ();
  72
  73     blob = reference_table_func (/*XXX*/const_cast<hb_face_t *> (this), tag, user_data);
  74     if (unlikely (!blob))
  75       return hb_blob_get_empty ();
  76
  77     return blob;
  78   }
  79
  80   inline HB_PURE_FUNC unsigned int get_upem (void) const
  81   {
  82     if (unlikely (!upem))
  83       load_upem ();
  84     return upem;
  85   }
  86
  87   inline unsigned int get_num_glyphs (void) const
  88   {
  89     if (unlikely (num_glyphs == (unsigned int) -1))
  90       load_num_glyphs ();
  91     return num_glyphs;
  92   }
  93
  94   private:
  95   HB_INTERNAL void load_upem (void) const;
  96   HB_INTERNAL void load_num_glyphs (void) const;
  97 };
  98
  99 extern HB_INTERNAL const hb_face_t _hb_face_nil;
 100
 101 #define HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS
 102 #define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_PROTOTYPE(shaper, face);
 103 #include "hb-shaper-list.hh"
 104 #undef HB_SHAPER_IMPLEMENT
 105 #undef HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS
 106
 107
 108 #endif /* HB_FACE_PRIVATE_HH */