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_HMTX_TABLE_HH 28 #define HB_OT_HMTX_TABLE_HH 29 30 #include "hb-open-type-private.hh" 31 32 33 namespace OT { 34 35 36 /* 37 * hmtx -- The Horizontal Metrics Table 38 * vmtx -- The Vertical Metrics Table 39 */ 40 41 #define HB_OT_TAG_hmtx HB_TAG('h','m','t','x') 42 #define HB_OT_TAG_vmtx HB_TAG('v','m','t','x') 43 44 45 struct LongMetric 46 { 47 UFWORD advance; /* Advance width/height. */ 48 FWORD lsb; /* Leading (left/top) side bearing. */ 49 public: 50 DEFINE_SIZE_STATIC (4); 51 }; 52 53 struct _mtx 54 { 55 static const hb_tag_t tableTag = HB_TAG('_','m','t','x'); 56 57 static const hb_tag_t hmtxTag = HB_OT_TAG_hmtx; 58 static const hb_tag_t vmtxTag = HB_OT_TAG_vmtx; 59 60 inline bool sanitize (hb_sanitize_context_t *c) const 61 { 62 TRACE_SANITIZE (this); 63 /* We don't check for anything specific here. The users of the 64 * struct do all the hard work... */ 65 return_trace (true); 66 } 67 68 public: 69 LongMetric longMetric[VAR]; /* Paired advance width and leading 70 * bearing values for each glyph. The 71 * value numOfHMetrics comes from 72 * the 'hhea' table. If the font is 73 * monospaced, only one entry need 74 * be in the array, but that entry is 75 * required. The last entry applies to 76 * all subsequent glyphs. */ 77 FWORD leadingBearingX[VAR]; /* Here the advance is assumed 78 * to be the same as the advance 79 * for the last entry above. The 80 * number of entries in this array is 81 * derived from numGlyphs (from 'maxp' 82 * table) minus numberOfLongMetrics. 83 * This generally is used with a run 84 * of monospaced glyphs (e.g., Kanji 85 * fonts or Courier fonts). Only one 86 * run is allowed and it must be at 87 * the end. This allows a monospaced 88 * font to vary the side bearing 89 * values for each glyph. */ 90 public: 91 DEFINE_SIZE_ARRAY2 (0, longMetric, leadingBearingX); 92 }; 93 94 struct hmtx : _mtx { 95 static const hb_tag_t tableTag = HB_OT_TAG_hmtx; 96 }; 97 struct vmtx : _mtx { 98 static const hb_tag_t tableTag = HB_OT_TAG_vmtx; 99 }; 100 101 } /* namespace OT */ 102 103 104 #endif /* HB_OT_HMTX_TABLE_HH */ 105
