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
42 namespace OT {
43
44
45 template <typename T>
46 struct _hea
47 {
48 bool sanitize (hb_sanitize_context_t *c) const
49 {
50 TRACE_SANITIZE (this);
51 return_trace (c->check_struct (this) && likely (version.major == 1));
52 }
53
54 public:
55 FixedVersion<>version; /* 0x00010000u for version 1.0. */
56 FWORD ascender; /* Typographic ascent. */
57 FWORD descender; /* Typographic descent. */
58 FWORD lineGap; /* Typographic line gap. */
59 UFWORD advanceMax; /* Maximum advance width/height value in
60 * metrics table. */
61 FWORD minLeadingBearing; /* Minimum left/top sidebearing value in
62 * metrics table. */
63 FWORD minTrailingBearing; /* Minimum right/bottom sidebearing value;
64 * calculated as Min(aw - lsb -
65 * (xMax - xMin)) for horizontal. */
66 FWORD maxExtent; /* horizontal: Max(lsb + (xMax - xMin)),
67 * vertical: minLeadingBearing+(yMax-yMin). */
68 HBINT16 caretSlopeRise; /* Used to calculate the slope of the
69 * cursor (rise/run); 1 for vertical caret,
70 * 0 for horizontal.*/
71 HBINT16 caretSlopeRun; /* 0 for vertical caret, 1 for horizontal. */
72 HBINT16 caretOffset; /* The amount by which a slanted
73 * highlight on a glyph needs
74 * to be shifted to produce the
75 * best appearance. Set to 0 for
76 * non-slanted fonts. */
77 HBINT16 reserved1; /* Set to 0. */
78 HBINT16 reserved2; /* Set to 0. */
79 HBINT16 reserved3; /* Set to 0. */
80 HBINT16 reserved4; /* Set to 0. */
81 HBINT16 metricDataFormat; /* 0 for current format. */
82 HBUINT16 numberOfLongMetrics; /* Number of LongMetric entries in metric
83 * table. */
84 public:
85 DEFINE_SIZE_STATIC (36);
86 };
87
88 struct hhea : _hea<hhea> {
89 static constexpr hb_tag_t tableTag = HB_OT_TAG_hhea;
90 };
91 struct vhea : _hea<vhea> {
92 static constexpr hb_tag_t tableTag = HB_OT_TAG_vhea;
93 };
94
95
96 } /* namespace OT */
97
98
99 #endif /* HB_OT_HHEA_TABLE_HH */