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 */ 39 40 #define HB_OT_TAG_hhea HB_TAG('h','h','e','a') 41 42 43 struct hhea 44 { 45 static const hb_tag_t tableTag = HB_OT_TAG_hhea; 46 sanitizeOT::hhea47 inline bool sanitize (hb_sanitize_context_t *c) { 48 TRACE_SANITIZE (this); 49 return TRACE_RETURN (c->check_struct (this) && likely (version.major == 1)); 50 } 51 52 protected: 53 FixedVersion version; /* 0x00010000 for version 1.0. */ 54 FWORD ascender; /* Typographic ascent. <a 55 * href="http://developer.apple.com/fonts/TTRefMan/RM06/Chap6hhea.html"> 56 * (Distance from baseline of highest 57 * ascender)</a> */ 58 FWORD descender; /* Typographic descent. <a 59 * href="http://developer.apple.com/fonts/TTRefMan/RM06/Chap6hhea.html"> 60 * (Distance from baseline of lowest 61 * descender)</a> */ 62 FWORD lineGap; /* Typographic line gap. Negative 63 * LineGap values are treated as zero 64 * in Windows 3.1, System 6, and 65 * System 7. */ 66 UFWORD advanceWidthMax; /* Maximum advance width value in 67 * 'hmtx' table. */ 68 FWORD minLeftSideBearing; /* Minimum left sidebearing value in 69 * 'hmtx' table. */ 70 FWORD minRightSideBearing; /* Minimum right sidebearing value; 71 * calculated as Min(aw - lsb - 72 * (xMax - xMin)). */ 73 FWORD xMaxExtent; /* Max(lsb + (xMax - xMin)). */ 74 SHORT caretSlopeRise; /* Used to calculate the slope of the 75 * cursor (rise/run); 1 for vertical. */ 76 SHORT caretSlopeRun; /* 0 for vertical. */ 77 SHORT caretOffset; /* The amount by which a slanted 78 * highlight on a glyph needs 79 * to be shifted to produce the 80 * best appearance. Set to 0 for 81 * non--slanted fonts */ 82 SHORT reserved1; /* set to 0 */ 83 SHORT reserved2; /* set to 0 */ 84 SHORT reserved3; /* set to 0 */ 85 SHORT reserved4; /* set to 0 */ 86 SHORT metricDataFormat; /* 0 for current format. */ 87 USHORT numberOfHMetrics; /* Number of hMetric entries in 'hmtx' 88 * table */ 89 public: 90 DEFINE_SIZE_STATIC (36); 91 }; 92 93 94 } /* namespace OT */ 95 96 97 #endif /* HB_OT_HHEA_TABLE_HH */ 98