2 * Copyright © 2019 Adobe Inc.
4 * This is part of HarfBuzz, a text shaping library.
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.
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
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.
24 * Adobe Author(s): Michiharu Ariza
33 /* Bi-directional map */
42 bool in_error () const { return forw_map.in_error () || back_map.in_error (); }
44 void set (hb_codepoint_t lhs, hb_codepoint_t rhs)
46 if (in_error ()) return;
47 if (unlikely (lhs == HB_MAP_VALUE_INVALID)) return;
48 if (unlikely (rhs == HB_MAP_VALUE_INVALID)) { del (lhs); return; }
50 forw_map.set (lhs, rhs);
51 if (in_error ()) return;
53 back_map.set (rhs, lhs);
54 if (in_error ()) forw_map.del (lhs);
57 hb_codepoint_t get (hb_codepoint_t lhs) const { return forw_map.get (lhs); }
58 hb_codepoint_t backward (hb_codepoint_t rhs) const { return back_map.get (rhs); }
60 hb_codepoint_t operator [] (hb_codepoint_t lhs) const { return get (lhs); }
61 bool has (hb_codepoint_t lhs, hb_codepoint_t *vp = nullptr) const { return forw_map.has (lhs, vp); }
63 void del (hb_codepoint_t lhs)
65 back_map.del (get (lhs));
75 bool is_empty () const { return get_population () == 0; }
77 unsigned int get_population () const { return forw_map.get_population (); }
84 /* Inremental bimap: only lhs is given, rhs is incrementally assigned */
85 struct hb_inc_bimap_t : hb_bimap_t
87 /* Add a mapping from lhs to rhs with a unique value if lhs is unknown.
88 * Return the rhs value as the result.
90 hb_codepoint_t add (hb_codepoint_t lhs)
92 hb_codepoint_t rhs = forw_map[lhs];
93 if (rhs == HB_MAP_VALUE_INVALID)
101 hb_codepoint_t skip ()
102 { return next_value++; }
104 hb_codepoint_t get_next_value () const
105 { return next_value; }
107 void add_set (const hb_set_t *set)
109 hb_codepoint_t i = HB_SET_VALUE_INVALID;
110 while (hb_set_next (set, &i)) add (i);
113 /* Create an identity map. */
114 bool identity (unsigned int size)
117 for (hb_codepoint_t i = 0; i < size; i++) set (i, i);
122 static int cmp_id (const void* a, const void* b)
123 { return (int)*(const hb_codepoint_t *)a - (int)*(const hb_codepoint_t *)b; }
126 /* Optional: after finished adding all mappings in a random order,
127 * reassign rhs to lhs so that they are in the same order. */
130 hb_codepoint_t count = get_population ();
131 hb_vector_t <hb_codepoint_t> work;
134 for (hb_codepoint_t rhs = 0; rhs < count; rhs++)
135 work[rhs] = back_map[rhs];
140 for (hb_codepoint_t rhs = 0; rhs < count; rhs++)
141 set (work[rhs], rhs);
145 unsigned int next_value = 0;
148 #endif /* HB_BIMAP_HH */