1/*
2 * Copyright © 2011,2012 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): Behdad Esfahbod
25 */
26
27#ifndef HB_OT_HHEA_TABLE_HH
28#define HB_OT_HHEA_TABLE_HH
29
30#include "hb-open-type.hh"
31
32/*
33 * hhea -- Horizontal Header
34 * https://docs.microsoft.com/en-us/typography/opentype/spec/hhea
35 * vhea -- Vertical Header
36 * https://docs.microsoft.com/en-us/typography/opentype/spec/vhea
37 */
38#define HB_OT_TAG_hhea HB_TAG('h','h','e','a')
39#define HB_OT_TAG_vhea HB_TAG('v','h','e','a')
40
41
42namespace OT {
43
44
45template <typename T>
46struct _hea
47{
48 bool has_data () const { return version.major; }
49
50 bool sanitize (hb_sanitize_context_t *c) const
51 {
52 TRACE_SANITIZE (this);
53 return_trace (c->check_struct (this) && likely (version.major == 1));
54 }
55
56 public:
57 FixedVersion<>version; /* 0x00010000u for version 1.0. */
58 FWORD ascender; /* Typographic ascent. */
59 FWORD descender; /* Typographic descent. */
60 FWORD lineGap; /* Typographic line gap. */
61 UFWORD advanceMax; /* Maximum advance width/height value in
62 * metrics table. */
63 FWORD minLeadingBearing; /* Minimum left/top sidebearing value in
64 * metrics table. */
65 FWORD minTrailingBearing; /* Minimum right/bottom sidebearing value;
66 * calculated as Min(aw - lsb -
67 * (xMax - xMin)) for horizontal. */
68 FWORD maxExtent; /* horizontal: Max(lsb + (xMax - xMin)),
69 * vertical: minLeadingBearing+(yMax-yMin). */
70 HBINT16 caretSlopeRise; /* Used to calculate the slope of the
71 * cursor (rise/run); 1 for vertical caret,
72 * 0 for horizontal.*/
73 HBINT16 caretSlopeRun; /* 0 for vertical caret, 1 for horizontal. */
74 HBINT16 caretOffset; /* The amount by which a slanted
75 * highlight on a glyph needs
76 * to be shifted to produce the
77 * best appearance. Set to 0 for
78 * non-slanted fonts. */
79 HBINT16 reserved1; /* Set to 0. */
80 HBINT16 reserved2; /* Set to 0. */
81 HBINT16 reserved3; /* Set to 0. */
82 HBINT16 reserved4; /* Set to 0. */
83 HBINT16 metricDataFormat; /* 0 for current format. */
84 HBUINT16 numberOfLongMetrics; /* Number of LongMetric entries in metric
85 * table. */
86 public:
87 DEFINE_SIZE_STATIC (36);
88};
89
90struct hhea : _hea<hhea> {
91 static constexpr hb_tag_t tableTag = HB_OT_TAG_hhea;
92};
93struct vhea : _hea<vhea> {
94 static constexpr hb_tag_t tableTag = HB_OT_TAG_vhea;
95};
96
97
98} /* namespace OT */
99
100
101#endif /* HB_OT_HHEA_TABLE_HH */
102