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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 
37 struct hb_subset_plan_t
38 {
39   hb_object_header_t header;
40 
41   bool drop_hints : 1;
42   bool drop_layout : 1;
43   bool desubroutinize : 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 
new_gid_for_codepointhb_subset_plan_t58   bool new_gid_for_codepoint (hb_codepoint_t codepoint,
59 			      hb_codepoint_t *new_gid) const
60   {
61     hb_codepoint_t old_gid = codepoint_to_glyph->get (codepoint);
62     if (old_gid == HB_MAP_VALUE_INVALID)
63       return false;
64 
65     return new_gid_for_old_gid (old_gid, new_gid);
66   }
67 
new_gid_for_old_gidhb_subset_plan_t68   bool new_gid_for_old_gid (hb_codepoint_t old_gid,
69 			    hb_codepoint_t *new_gid) const
70   {
71     hb_codepoint_t gid = glyph_map->get (old_gid);
72     if (gid == HB_MAP_VALUE_INVALID)
73       return false;
74 
75     *new_gid = gid;
76     return true;
77   }
78 
79   bool
add_tablehb_subset_plan_t80   add_table (hb_tag_t tag,
81 	     hb_blob_t *contents)
82   {
83     hb_blob_t *source_blob = source->reference_table (tag);
84     DEBUG_MSG(SUBSET, nullptr, "add table %c%c%c%c, dest %d bytes, source %d bytes",
85 	      HB_UNTAG(tag),
86 	      hb_blob_get_length (contents),
87 	      hb_blob_get_length (source_blob));
88     hb_blob_destroy (source_blob);
89     return hb_face_builder_add_table (dest, tag, contents);
90   }
91 };
92 
93 typedef struct hb_subset_plan_t hb_subset_plan_t;
94 
95 HB_INTERNAL hb_subset_plan_t *
96 hb_subset_plan_create (hb_face_t           *face,
97                        hb_subset_input_t   *input);
98 
99 HB_INTERNAL void
100 hb_subset_plan_destroy (hb_subset_plan_t *plan);
101 
102 #endif /* HB_SUBSET_PLAN_HH */
103