1/*
2 * Copyright © 2018 Ebrahim Byagowi
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
25#ifndef HB_AAT_LAYOUT_ANKR_TABLE_HH
26#define HB_AAT_LAYOUT_ANKR_TABLE_HH
27
28#include "hb-aat-layout-common.hh"
29
30/*
31 * ankr -- Anchor Point
32 * https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6ankr.html
33 */
34#define HB_AAT_TAG_ankr HB_TAG('a','n','k','r')
35
36
37namespace AAT {
38
39using namespace OT;
40
41
42struct Anchor
43{
44 bool sanitize (hb_sanitize_context_t *c) const
45 {
46 TRACE_SANITIZE (this);
47 return_trace (c->check_struct (this));
48 }
49
50 public:
51 FWORD xCoordinate;
52 FWORD yCoordinate;
53 public:
54 DEFINE_SIZE_STATIC (4);
55};
56
57typedef LArrayOf<Anchor> GlyphAnchors;
58
59struct ankr
60{
61 static constexpr hb_tag_t tableTag = HB_AAT_TAG_ankr;
62
63 const Anchor &get_anchor (hb_codepoint_t glyph_id,
64 unsigned int i,
65 unsigned int num_glyphs) const
66 {
67 const NNOffsetTo<GlyphAnchors> *offset = (this+lookupTable).get_value (glyph_id, num_glyphs);
68 if (!offset)
69 return Null(Anchor);
70 const GlyphAnchors &anchors = &(this+anchorData) + *offset;
71 return anchors[i];
72 }
73
74 bool sanitize (hb_sanitize_context_t *c) const
75 {
76 TRACE_SANITIZE (this);
77 return_trace (likely (c->check_struct (this) &&
78 version == 0 &&
79 c->check_range (this, anchorData) &&
80 lookupTable.sanitize (c, this, &(this+anchorData))));
81 }
82
83 protected:
84 HBUINT16 version; /* Version number (set to zero) */
85 HBUINT16 flags; /* Flags (currently unused; set to zero) */
86 LOffsetTo<Lookup<NNOffsetTo<GlyphAnchors>>>
87 lookupTable; /* Offset to the table's lookup table */
88 LNNOffsetTo<HBUINT8>
89 anchorData; /* Offset to the glyph data table */
90
91 public:
92 DEFINE_SIZE_STATIC (12);
93};
94
95} /* namespace AAT */
96
97
98#endif /* HB_AAT_LAYOUT_ANKR_TABLE_HH */
99