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 | |
33 | namespace 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 | |
45 | struct _hea |
46 | { |
47 | inline bool sanitize (hb_sanitize_context_t *c) const |
48 | { |
49 | TRACE_SANITIZE (this); |
50 | return_trace (c->check_struct (this) && likely (version.major == 1)); |
51 | } |
52 | |
53 | public: |
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 |
59 | * metrics table. */ |
60 | FWORD minLeadingBearing; /* Minimum left/top sidebearing value in |
61 | * metrics table. */ |
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 | INT16 caretSlopeRise; /* Used to calculate the slope of the |
68 | * cursor (rise/run); 1 for vertical caret, |
69 | * 0 for horizontal.*/ |
70 | INT16 caretSlopeRun; /* 0 for vertical caret, 1 for horizontal. */ |
71 | INT16 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 | INT16 reserved1; /* Set to 0. */ |
77 | INT16 reserved2; /* Set to 0. */ |
78 | INT16 reserved3; /* Set to 0. */ |
79 | INT16 reserved4; /* Set to 0. */ |
80 | INT16 metricDataFormat; /* 0 for current format. */ |
81 | UINT16 numberOfLongMetrics; /* Number of LongMetric entries in metric |
82 | * table. */ |
83 | public: |
84 | DEFINE_SIZE_STATIC (36); |
85 | }; |
86 | |
87 | struct hhea : _hea { |
88 | static const hb_tag_t tableTag = HB_OT_TAG_hhea; |
89 | }; |
90 | struct vhea : _hea { |
91 | static const hb_tag_t tableTag = HB_OT_TAG_vhea; |
92 | }; |
93 | |
94 | |
95 | } /* namespace OT */ |
96 | |
97 | |
98 | #endif /* HB_OT_HHEA_TABLE_HH */ |
99 | |