2 * Copyright © 2011,2012 Google, Inc.
4 * This is part of HarfBuzz, a text shaping library.
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.
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
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.
24 * Google Author(s): Behdad Esfahbod
27 #ifndef HB_OT_HHEA_TABLE_HH
28 #define HB_OT_HHEA_TABLE_HH
30 #include "hb-open-type-private.hh"
37 * hhea -- The Horizontal Header Table
38 * vhea -- The Vertical Header Table
41 #define HB_OT_TAG_hhea HB_TAG('h','h','e','a')
42 #define HB_OT_TAG_vhea HB_TAG('v','h','e','a')
47 inline bool sanitize (hb_sanitize_context_t *c) const
49 TRACE_SANITIZE (this);
50 return_trace (c->check_struct (this) && likely (version.major == 1));
54 FixedVersion<>version; /* 0x00010000u for version 1.0. */
55 FWORD ascender; /* Typographic ascent. */
56 FWORD descender; /* Typographic descent. */
57 FWORD lineGap; /* Typographic line gap. */
58 UFWORD advanceMax; /* Maximum advance width/height value in
60 FWORD minLeadingBearing; /* Minimum left/top sidebearing value in
62 FWORD minTrailingBearing; /* Minimum right/bottom sidebearing value;
63 * calculated as Min(aw - lsb -
64 * (xMax - xMin)) for horizontal. */
65 FWORD maxExtent; /* horizontal: Max(lsb + (xMax - xMin)),
66 * vertical: minLeadingBearing+(yMax-yMin). */
67 HBINT16 caretSlopeRise; /* Used to calculate the slope of the
68 * cursor (rise/run); 1 for vertical caret,
70 HBINT16 caretSlopeRun; /* 0 for vertical caret, 1 for horizontal. */
71 HBINT16 caretOffset; /* The amount by which a slanted
72 * highlight on a glyph needs
73 * to be shifted to produce the
74 * best appearance. Set to 0 for
75 * non-slanted fonts. */
76 HBINT16 reserved1; /* Set to 0. */
77 HBINT16 reserved2; /* Set to 0. */
78 HBINT16 reserved3; /* Set to 0. */
79 HBINT16 reserved4; /* Set to 0. */
80 HBINT16 metricDataFormat; /* 0 for current format. */
81 HBUINT16 numberOfLongMetrics; /* Number of LongMetric entries in metric
84 DEFINE_SIZE_STATIC (36);
87 struct hhea : _hea<hhea> {
88 static const hb_tag_t tableTag = HB_OT_TAG_hhea;
90 struct vhea : _hea<vhea> {
91 static const hb_tag_t tableTag = HB_OT_TAG_vhea;
98 #endif /* HB_OT_HHEA_TABLE_HH */