1/*
2 * Copyright © 2009 Red Hat, Inc.
3 * Copyright © 2011 Google, Inc.
4 *
5 * This is part of HarfBuzz, a text shaping library.
6 *
7 * Permission is hereby granted, without written agreement and without
8 * license or royalty fees, to use, copy, modify, and distribute this
9 * software and its documentation for any purpose, provided that the
10 * above copyright notice and the following two paragraphs appear in
11 * all copies of this software.
12 *
13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
17 * DAMAGE.
18 *
19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
24 *
25 * Red Hat Author(s): Behdad Esfahbod
26 * Google Author(s): Behdad Esfahbod
27 */
28
29#ifndef HB_FACE_HH
30#define HB_FACE_HH
31
32#include "hb.hh"
33
34#include "hb-shaper.hh"
35#include "hb-shape-plan.hh"
36
37
38/*
39 * hb_face_t
40 */
41
42struct hb_face_t
43{
44 hb_object_header_t header;
45 ASSERT_POD ();
46
47 hb_bool_t immutable;
48
49 hb_reference_table_func_t reference_table_func;
50 void *user_data;
51 hb_destroy_func_t destroy;
52
53 unsigned int index; /* Face index in a collection, zero-based. */
54 mutable unsigned int upem; /* Units-per-EM. */
55 mutable unsigned int num_glyphs; /* Number of glyphs. */
56
57 struct hb_shaper_data_t shaper_data; /* Various shaper data. */
58
59 /* Cache */
60 struct plan_node_t
61 {
62 hb_shape_plan_t *shape_plan;
63 plan_node_t *next;
64 };
65 hb_atomic_ptr_t<plan_node_t> shape_plans;
66
67 inline hb_blob_t *reference_table (hb_tag_t tag) const
68 {
69 hb_blob_t *blob;
70
71 if (unlikely (!reference_table_func))
72 return hb_blob_get_empty ();
73
74 blob = reference_table_func (/*XXX*/const_cast<hb_face_t *> (this), tag, user_data);
75 if (unlikely (!blob))
76 return hb_blob_get_empty ();
77
78 return blob;
79 }
80
81 inline HB_PURE_FUNC unsigned int get_upem (void) const
82 {
83 if (unlikely (!upem))
84 load_upem ();
85 return upem;
86 }
87
88 inline unsigned int get_num_glyphs (void) const
89 {
90 if (unlikely (num_glyphs == (unsigned int) -1))
91 load_num_glyphs ();
92 return num_glyphs;
93 }
94
95 private:
96 HB_INTERNAL void load_upem (void) const;
97 HB_INTERNAL void load_num_glyphs (void) const;
98};
99DECLARE_NULL_INSTANCE (hb_face_t);
100
101#define HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS
102#define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_PROTOTYPE(shaper, face);
103#include "hb-shaper-list.hh"
104#undef HB_SHAPER_IMPLEMENT
105#undef HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS
106
107
108#endif /* HB_FACE_HH */
109