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"
35 * hhea -- The Horizontal Header Table
38 #define HB_OT_TAG_hhea HB_TAG('h','h','e','a')
43 static const hb_tag_t Tag = HB_OT_TAG_hhea;
45 inline bool sanitize (hb_sanitize_context_t *c) {
47 return TRACE_RETURN (c->check_struct (this) && likely (version.major == 1));
51 FixedVersion version; /* 0x00010000 for version 1.0. */
52 FWORD ascender; /* Typographic ascent. <a
53 * href="http://developer.apple.com/fonts/TTRefMan/RM06/Chap6hhea.html">
54 * (Distance from baseline of highest
56 FWORD descender; /* Typographic descent. <a
57 * href="http://developer.apple.com/fonts/TTRefMan/RM06/Chap6hhea.html">
58 * (Distance from baseline of lowest
60 FWORD lineGap; /* Typographic line gap. Negative
61 * LineGap values are treated as zero
62 * in Windows 3.1, System 6, and
64 UFWORD advanceWidthMax; /* Maximum advance width value in
66 FWORD minLeftSideBearing; /* Minimum left sidebearing value in
68 FWORD minRightSideBearing; /* Minimum right sidebearing value;
69 * calculated as Min(aw - lsb -
71 FWORD xMaxExtent; /* Max(lsb + (xMax - xMin)). */
72 SHORT caretSlopeRise; /* Used to calculate the slope of the
73 * cursor (rise/run); 1 for vertical. */
74 SHORT caretSlopeRun; /* 0 for vertical. */
75 SHORT caretOffset; /* The amount by which a slanted
76 * highlight on a glyph needs
77 * to be shifted to produce the
78 * best appearance. Set to 0 for
79 * non--slanted fonts */
80 SHORT reserved1; /* set to 0 */
81 SHORT reserved2; /* set to 0 */
82 SHORT reserved3; /* set to 0 */
83 SHORT reserved4; /* set to 0 */
84 SHORT metricDataFormat; /* 0 for current format. */
85 USHORT numberOfHMetrics; /* Number of hMetric entries in 'hmtx'
88 DEFINE_SIZE_STATIC (36);
92 #endif /* HB_OT_HHEA_TABLE_HH */