1 /*
   2  * Copyright © 2018  Google, 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  * Google Author(s): Behdad Esfahbod
  25  */
  26 
  27 #ifndef HB_AAT_MAP_HH
  28 #define HB_AAT_MAP_HH
  29 
  30 #include "hb.hh"
  31 
  32 
  33 struct hb_aat_map_t
  34 {
  35   friend struct hb_aat_map_builder_t;
  36 
  37   public:
  38 
  39   void init ()
  40   {
  41     memset (this, 0, sizeof (*this));
  42     chain_flags.init ();
  43   }
  44   void fini () { chain_flags.fini (); }
  45 
  46   public:
  47   hb_vector_t<hb_mask_t> chain_flags;
  48 };
  49 
  50 struct hb_aat_map_builder_t
  51 {
  52   public:
  53 
  54   HB_INTERNAL hb_aat_map_builder_t (hb_face_t *face_,
  55                                     const hb_segment_properties_t *props_ HB_UNUSED) :
  56                                       face (face_) {}
  57 
  58   HB_INTERNAL void add_feature (hb_tag_t tag, unsigned int value=1);
  59 
  60   HB_INTERNAL void compile (hb_aat_map_t  &m);
  61 
  62   public:
  63   struct feature_info_t
  64   {
  65     hb_aat_layout_feature_type_t  type;
  66     hb_aat_layout_feature_selector_t  setting;
  67     unsigned  seq; /* For stable sorting only. */
  68 
  69     static int cmp (const void *pa, const void *pb)
  70     {
  71       const feature_info_t *a = (const feature_info_t *) pa;
  72       const feature_info_t *b = (const feature_info_t *) pb;
  73       return (a->type != b->type) ? (a->type < b->type ? -1 : 1) :
  74              (a->seq < b->seq ? -1 : a->seq > b->seq ? 1 : 0);
  75     }
  76 
  77     int cmp (hb_aat_layout_feature_type_t ty) const
  78     {
  79       return (type != ty) ? (type < ty ? -1 : 1) : 0;
  80     }
  81   };
  82 
  83   public:
  84   hb_face_t *face;
  85 
  86   public:
  87   hb_vector_t<feature_info_t> features;
  88 };
  89 
  90 
  91 #endif /* HB_AAT_MAP_HH */