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.hh" 31 32 /* 33 * hhea -- Horizontal Header 34 * https://docs.microsoft.com/en-us/typography/opentype/spec/hhea 35 * vhea -- Vertical Header 36 * https://docs.microsoft.com/en-us/typography/opentype/spec/vhea 37 */ 38 #define HB_OT_TAG_hhea HB_TAG('h','h','e','a') 39 #define HB_OT_TAG_vhea HB_TAG('v','h','e','a') 40 41 42 namespace OT { 43 44 45 template <typename T> 46 struct _hea 47 { has_dataOT::_hea48 bool has_data () const { return version.major; } 49 sanitizeOT::_hea50 bool sanitize (hb_sanitize_context_t *c) const 51 { 52 TRACE_SANITIZE (this); 53 return_trace (c->check_struct (this) && likely (version.major == 1)); 54 } 55 56 public: 57 FixedVersion<>version; /* 0x00010000u for version 1.0. */ 58 FWORD ascender; /* Typographic ascent. */ 59 FWORD descender; /* Typographic descent. */ 60 FWORD lineGap; /* Typographic line gap. */ 61 UFWORD advanceMax; /* Maximum advance width/height value in 62 * metrics table. */ 63 FWORD minLeadingBearing; /* Minimum left/top sidebearing value in 64 * metrics table. */ 65 FWORD minTrailingBearing; /* Minimum right/bottom sidebearing value; 66 * calculated as Min(aw - lsb - 67 * (xMax - xMin)) for horizontal. */ 68 FWORD maxExtent; /* horizontal: Max(lsb + (xMax - xMin)), 69 * vertical: minLeadingBearing+(yMax-yMin). */ 70 HBINT16 caretSlopeRise; /* Used to calculate the slope of the 71 * cursor (rise/run); 1 for vertical caret, 72 * 0 for horizontal.*/ 73 HBINT16 caretSlopeRun; /* 0 for vertical caret, 1 for horizontal. */ 74 HBINT16 caretOffset; /* The amount by which a slanted 75 * highlight on a glyph needs 76 * to be shifted to produce the 77 * best appearance. Set to 0 for 78 * non-slanted fonts. */ 79 HBINT16 reserved1; /* Set to 0. */ 80 HBINT16 reserved2; /* Set to 0. */ 81 HBINT16 reserved3; /* Set to 0. */ 82 HBINT16 reserved4; /* Set to 0. */ 83 HBINT16 metricDataFormat; /* 0 for current format. */ 84 HBUINT16 numberOfLongMetrics; /* Number of LongMetric entries in metric 85 * table. */ 86 public: 87 DEFINE_SIZE_STATIC (36); 88 }; 89 90 struct hhea : _hea<hhea> { 91 static constexpr hb_tag_t tableTag = HB_OT_TAG_hhea; 92 }; 93 struct vhea : _hea<vhea> { 94 static constexpr hb_tag_t tableTag = HB_OT_TAG_vhea; 95 }; 96 97 98 } /* namespace OT */ 99 100 101 #endif /* HB_OT_HHEA_TABLE_HH */ 102