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-private.hh"
31
32
33namespace OT {
34
35
36/*
37 * hhea -- The Horizontal Header Table
38 * vhea -- The Vertical Header Table
39 */
40
41#define HB_OT_TAG_hhea HB_TAG('h','h','e','a')
42#define HB_OT_TAG_vhea HB_TAG('v','h','e','a')
43
44
45struct _hea
46{
47  static const hb_tag_t tableTag = HB_TAG('_','h','e','a');
48
49  static const hb_tag_t hheaTag = HB_OT_TAG_hhea;
50  static const hb_tag_t vheaTag = HB_OT_TAG_vhea;
51
52  inline bool sanitize (hb_sanitize_context_t *c) const
53  {
54    TRACE_SANITIZE (this);
55    return_trace (c->check_struct (this) && likely (version.major == 1));
56  }
57
58  public:
59  FixedVersion<>version;                /* 0x00010000u for version 1.0. */
60  FWORD         ascender;               /* Typographic ascent. */
61  FWORD         descender;              /* Typographic descent. */
62  FWORD         lineGap;                /* Typographic line gap. */
63  UFWORD        advanceMax;             /* Maximum advance width/height value in
64                                         * metrics table. */
65  FWORD         minLeadingBearing;      /* Minimum left/top sidebearing value in
66                                         * metrics table. */
67  FWORD         minTrailingBearing;     /* Minimum right/bottom sidebearing value;
68                                         * calculated as Min(aw - lsb -
69                                         * (xMax - xMin)) for horizontal. */
70  FWORD         maxExtent;              /* horizontal: Max(lsb + (xMax - xMin)),
71                                         * vertical: minLeadingBearing+(yMax-yMin). */
72  SHORT         caretSlopeRise;         /* Used to calculate the slope of the
73                                         * cursor (rise/run); 1 for vertical caret,
74                                         * 0 for horizontal.*/
75  SHORT         caretSlopeRun;          /* 0 for vertical caret, 1 for horizontal. */
76  SHORT         caretOffset;            /* The amount by which a slanted
77                                         * highlight on a glyph needs
78                                         * to be shifted to produce the
79                                         * best appearance. Set to 0 for
80                                         * non-slanted fonts. */
81  SHORT         reserved1;              /* Set to 0. */
82  SHORT         reserved2;              /* Set to 0. */
83  SHORT         reserved3;              /* Set to 0. */
84  SHORT         reserved4;              /* Set to 0. */
85  SHORT         metricDataFormat;       /* 0 for current format. */
86  USHORT        numberOfLongMetrics;    /* Number of LongMetric entries in metric
87                                         * table. */
88  public:
89  DEFINE_SIZE_STATIC (36);
90};
91
92struct hhea : _hea {
93  static const hb_tag_t tableTag        = HB_OT_TAG_hhea;
94};
95struct vhea : _hea {
96  static const hb_tag_t tableTag        = HB_OT_TAG_vhea;
97};
98
99
100} /* namespace OT */
101
102
103#endif /* HB_OT_HHEA_TABLE_HH */
104