1 /*
2 * Copyright © 2022 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): Garret Rieger
25 */
26
27 #ifndef GRAPH_SPLIT_HELPERS_HH
28 #define GRAPH_SPLIT_HELPERS_HH
29
30 namespace graph {
31
32 template<typename Context>
33 HB_INTERNAL
actuate_subtable_split(Context & split_context,const hb_vector_t<unsigned> & split_points)34 hb_vector_t<unsigned> actuate_subtable_split (Context& split_context,
35 const hb_vector_t<unsigned>& split_points)
36 {
37 hb_vector_t<unsigned> new_objects;
38 if (!split_points)
39 return new_objects;
40
41 for (unsigned i = 0; i < split_points.length; i++)
42 {
43 unsigned start = split_points[i];
44 unsigned end = (i < split_points.length - 1)
45 ? split_points[i + 1]
46 : split_context.original_count ();
47 unsigned id = split_context.clone_range (start, end);
48
49 if (id == (unsigned) -1)
50 {
51 new_objects.reset ();
52 new_objects.allocated = -1; // mark error
53 return new_objects;
54 }
55 new_objects.push (id);
56 }
57
58 if (!split_context.shrink (split_points[0]))
59 {
60 new_objects.reset ();
61 new_objects.allocated = -1; // mark error
62 }
63
64 return new_objects;
65 }
66
67 }
68
69 #endif // GRAPH_SPLIT_HELPERS_HH
70