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) { 53 TRACE_SANITIZE (this); 54 return TRACE_RETURN (c->check_struct (this) && likely (version.major == 1)); 55 } 56 57 public: 58 FixedVersion version; /* 0x00010000u for version 1.0. */ 59 FWORD ascender; /* Typographic ascent. */ 60 FWORD descender; /* Typographic descent. */ 61 FWORD lineGap; /* Typographic line gap. */ 62 UFWORD advanceMax; /* Maximum advance width/height value in 63 * metrics table. */ 64 FWORD minLeadingBearing; /* Minimum left/top sidebearing value in 65 * metrics table. */ 66 FWORD minTrailingBearing; /* Minimum right/bottom sidebearing value; 67 * calculated as Min(aw - lsb - 68 * (xMax - xMin)) for horizontal. */ 69 FWORD maxExtent; /* horizontal: Max(lsb + (xMax - xMin)), 70 * vertical: minLeadingBearing+(yMax-yMin). */ 71 SHORT caretSlopeRise; /* Used to calculate the slope of the 72 * cursor (rise/run); 1 for vertical caret, 73 * 0 for horizontal.*/ 74 SHORT caretSlopeRun; /* 0 for vertical caret, 1 for horizontal. */ 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 numberOfLongMetrics; /* Number of LongMetric entries in metric 86 * table. */ 87 public: 88 DEFINE_SIZE_STATIC (36); 89 }; 90 91 struct hhea : _hea { 92 static const hb_tag_t tableTag = HB_OT_TAG_hhea; 93 }; 94 struct vhea : _hea { 95 static const hb_tag_t tableTag = HB_OT_TAG_vhea; 96 }; 97 98 99 } /* namespace OT */ 100 101 102 #endif /* HB_OT_HHEA_TABLE_HH */ 103