hb-ot-hhea-table.hh (3406B)
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 { 48 bool has_data () const { return version.major; } 49 50 bool sanitize (hb_sanitize_context_t *c) const 51 { 52 TRACE_SANITIZE (this); 53 return_trace (c->check_struct (this) && 54 hb_barrier () && 55 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; 66 /* Minimum left/top sidebearing value in 67 * metrics table. */ 68 FWORD minTrailingBearing; 69 /* Minimum right/bottom sidebearing value; 70 * calculated as Min(aw - lsb - 71 * (xMax - xMin)) for horizontal. */ 72 FWORD maxExtent; /* horizontal: Max(lsb + (xMax - xMin)), 73 * vertical: minLeadingBearing+(yMax-yMin). */ 74 HBINT16 caretSlopeRise; /* Used to calculate the slope of the 75 * cursor (rise/run); 1 for vertical caret, 76 * 0 for horizontal.*/ 77 HBINT16 caretSlopeRun; /* 0 for vertical caret, 1 for horizontal. */ 78 HBINT16 caretOffset; /* The amount by which a slanted 79 * highlight on a glyph needs 80 * to be shifted to produce the 81 * best appearance. Set to 0 for 82 * non-slanted fonts. */ 83 HBINT16 reserved1; /* Set to 0. */ 84 HBINT16 reserved2; /* Set to 0. */ 85 HBINT16 reserved3; /* Set to 0. */ 86 HBINT16 reserved4; /* Set to 0. */ 87 HBINT16 metricDataFormat;/* 0 for current format. */ 88 HBUINT16 numberOfLongMetrics; 89 /* Number of LongMetric entries in metric 90 * table. */ 91 public: 92 DEFINE_SIZE_STATIC (36); 93 }; 94 95 struct hhea : _hea<hhea> { 96 static constexpr hb_tag_t tableTag = HB_OT_TAG_hhea; 97 }; 98 struct vhea : _hea<vhea> { 99 static constexpr hb_tag_t tableTag = HB_OT_TAG_vhea; 100 }; 101 102 103 } /* namespace OT */ 104 105 106 #endif /* HB_OT_HHEA_TABLE_HH */