1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation. Oracle designates this
7 * particular file as subject to the "Classpath" exception as provided
8 * by Oracle in the LICENSE file that accompanied this code.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 */
24
25 // This file is available under and governed by the GNU General Public
26 // License version 2 only, as published by the Free Software Foundation.
27 // However, the following notice accompanied the original version of this
28 // file:
29 //
30 /*
31 * Copyright © 2011,2012 Google, Inc.
32 *
33 * This is part of HarfBuzz, a text shaping library.
34 *
35 * Permission is hereby granted, without written agreement and without
36 * license or royalty fees, to use, copy, modify, and distribute this
37 * software and its documentation for any purpose, provided that the
38 * above copyright notice and the following two paragraphs appear in
39 * all copies of this software.
40 *
41 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
42 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
43 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
44 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
45 * DAMAGE.
46 *
47 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
48 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
49 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
50 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
51 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
52 *
53 * Google Author(s): Behdad Esfahbod
54 */
55
56 #ifndef HB_OT_HHEA_TABLE_HH
57 #define HB_OT_HHEA_TABLE_HH
58
59 #include "hb-open-type-private.hh"
60
61
62 namespace OT {
63
64
65 /*
66 * hhea -- The Horizontal Header Table
67 * vhea -- The Vertical Header Table
68 */
69
70 #define HB_OT_TAG_hhea HB_TAG('h','h','e','a')
71 #define HB_OT_TAG_vhea HB_TAG('v','h','e','a')
72
73
74 struct _hea
75 {
76 static const hb_tag_t tableTag = HB_TAG('_','h','e','a');
77
78 static const hb_tag_t hheaTag = HB_OT_TAG_hhea;
79 static const hb_tag_t vheaTag = HB_OT_TAG_vhea;
80
81 inline bool sanitize (hb_sanitize_context_t *c) const
82 {
83 TRACE_SANITIZE (this);
84 return_trace (c->check_struct (this) && likely (version.major == 1));
85 }
86
87 public:
88 FixedVersion version; /* 0x00010000u for version 1.0. */
89 FWORD ascender; /* Typographic ascent. */
90 FWORD descender; /* Typographic descent. */
91 FWORD lineGap; /* Typographic line gap. */
92 UFWORD advanceMax; /* Maximum advance width/height value in
93 * metrics table. */
94 FWORD minLeadingBearing; /* Minimum left/top sidebearing value in
95 * metrics table. */
96 FWORD minTrailingBearing; /* Minimum right/bottom sidebearing value;
97 * calculated as Min(aw - lsb -
98 * (xMax - xMin)) for horizontal. */
99 FWORD maxExtent; /* horizontal: Max(lsb + (xMax - xMin)),
100 * vertical: minLeadingBearing+(yMax-yMin). */
101 SHORT caretSlopeRise; /* Used to calculate the slope of the
102 * cursor (rise/run); 1 for vertical caret,
103 * 0 for horizontal.*/
104 SHORT caretSlopeRun; /* 0 for vertical caret, 1 for horizontal. */
105 SHORT caretOffset; /* The amount by which a slanted
106 * highlight on a glyph needs
107 * to be shifted to produce the
108 * best appearance. Set to 0 for
109 * non-slanted fonts. */
110 SHORT reserved1; /* Set to 0. */
111 SHORT reserved2; /* Set to 0. */
112 SHORT reserved3; /* Set to 0. */
113 SHORT reserved4; /* Set to 0. */
114 SHORT metricDataFormat; /* 0 for current format. */
115 USHORT numberOfLongMetrics; /* Number of LongMetric entries in metric
116 * table. */
117 public:
118 DEFINE_SIZE_STATIC (36);
119 };
120
121 struct hhea : _hea {
122 static const hb_tag_t tableTag = HB_OT_TAG_hhea;
123 };
124 struct vhea : _hea {
125 static const hb_tag_t tableTag = HB_OT_TAG_vhea;
126 };
127
128
129 } /* namespace OT */
130
131
132 #endif /* HB_OT_HHEA_TABLE_HH */