third_party/harfbuzz-ng/src/hb-ot-hhea-table.hh

   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
  47   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 */