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): Garret Rieger, Roderick Sheeter
25 */
26
27#ifndef HB_SUBSET_PLAN_HH
28#define HB_SUBSET_PLAN_HH
29
30#include "hb.hh"
31
32#include "hb-subset.h"
33#include "hb-subset-input.hh"
34
35#include "hb-map.hh"
36
37struct hb_subset_plan_t
38{
39 hb_object_header_t header;
40 ASSERT_POD ();
41
42 bool drop_hints : 1;
43 bool drop_layout : 1;
44
45 // For each cp that we'd like to retain maps to the corresponding gid.
46 hb_set_t *unicodes;
47
48 hb_vector_t<hb_codepoint_t> glyphs;
49 hb_set_t *glyphset;
50
51 hb_map_t *codepoint_to_glyph;
52 hb_map_t *glyph_map;
53
54 // Plan is only good for a specific source/dest so keep them with it
55 hb_face_t *source;
56 hb_face_t *dest;
57
58 inline bool
59 new_gid_for_codepoint (hb_codepoint_t codepoint,
60 hb_codepoint_t *new_gid) const
61 {
62 hb_codepoint_t old_gid = codepoint_to_glyph->get (codepoint);
63 if (old_gid == HB_MAP_VALUE_INVALID)
64 return false;
65
66 return new_gid_for_old_gid (old_gid, new_gid);
67 }
68
69 inline bool
70 new_gid_for_old_gid (hb_codepoint_t old_gid,
71 hb_codepoint_t *new_gid) const
72 {
73 hb_codepoint_t gid = glyph_map->get (old_gid);
74 if (gid == HB_MAP_VALUE_INVALID)
75 return false;
76
77 *new_gid = gid;
78 return true;
79 }
80
81 inline bool
82 add_table (hb_tag_t tag,
83 hb_blob_t *contents)
84 {
85 hb_blob_t *source_blob = source->reference_table (tag);
86 DEBUG_MSG(SUBSET, nullptr, "add table %c%c%c%c, dest %d bytes, source %d bytes",
87 HB_UNTAG(tag),
88 hb_blob_get_length (contents),
89 hb_blob_get_length (source_blob));
90 hb_blob_destroy (source_blob);
91 return hb_face_builder_add_table (dest, tag, contents);
92 }
93};
94
95typedef struct hb_subset_plan_t hb_subset_plan_t;
96
97HB_INTERNAL hb_subset_plan_t *
98hb_subset_plan_create (hb_face_t *face,
99 hb_subset_input_t *input);
100
101HB_INTERNAL void
102hb_subset_plan_destroy (hb_subset_plan_t *plan);
103
104#endif /* HB_SUBSET_PLAN_HH */
105