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 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 sanitizeOT::_hea52 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 92 struct hhea : _hea { 93 static const hb_tag_t tableTag = HB_OT_TAG_hhea; 94 }; 95 struct 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