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  * vhea -- The Vertical Header Table
  39  */
  40
  41 #define HB_OT_TAG_hhea HB_TAG('h','h','e','a')
  42 #define HB_OT_TAG_vhea HB_TAG('v','h','e','a')
  43
  44
  45 struct _hea
  46 {
  47   static const hb_tag_t tableTag = HB_TAG('_','h','e','a');
  48
  49   static const hb_tag_t hheaTag = HB_OT_TAG_hhea;
  50   static const hb_tag_t vheaTag = HB_OT_TAG_vhea;
  51
  52   inline bool sanitize (hb_sanitize_context_t *c) const
  53   {
  54     TRACE_SANITIZE (this);
  55     return TRACE_RETURN (c->check_struct (this) && 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;      /* Minimum left/top sidebearing value in
  66                                          * metrics table. */
  67   FWORD         minTrailingBearing;     /* Minimum right/bottom sidebearing value;
  68                                          * calculated as Min(aw - lsb -
  69                                          * (xMax - xMin)) for horizontal. */
  70   FWORD         maxExtent;              /* horizontal: Max(lsb + (xMax - xMin)),
  71                                          * vertical: minLeadingBearing+(yMax-yMin). */
  72   SHORT         caretSlopeRise;         /* Used to calculate the slope of the
  73                                          * cursor (rise/run); 1 for vertical caret,
  74                                          * 0 for horizontal.*/
  75   SHORT         caretSlopeRun;          /* 0 for vertical caret, 1 for horizontal. */
  76   SHORT         caretOffset;            /* The amount by which a slanted
  77                                          * highlight on a glyph needs
  78                                          * to be shifted to produce the
  79                                          * best appearance. Set to 0 for
  80                                          * non-slanted fonts. */
  81   SHORT         reserved1;              /* Set to 0. */
  82   SHORT         reserved2;              /* Set to 0. */
  83   SHORT         reserved3;              /* Set to 0. */
  84   SHORT         reserved4;              /* Set to 0. */
  85   SHORT         metricDataFormat;       /* 0 for current format. */
  86   USHORT        numberOfLongMetrics;    /* Number of LongMetric entries in metric
  87                                          * table. */
  88   public:
  89   DEFINE_SIZE_STATIC (36);
  90 };
  91
  92 struct hhea : _hea {
  93   static const hb_tag_t tableTag        = HB_OT_TAG_hhea;
  94 };
  95 struct vhea : _hea {
  96   static const hb_tag_t tableTag        = HB_OT_TAG_vhea;
  97 };
  98
  99
 100 } /* namespace OT */
 101
 102
 103 #endif /* HB_OT_HHEA_TABLE_HH */