xref: /openjdk9/jdk/src/java.desktop/share/native/libfontmanager/harfbuzz/hb-ot-hhea-table.hh

/*
 * Copyright �� 2011,2012  Google, Inc.
 *
 *  This is part of HarfBuzz, a text shaping library.
 *
 * Permission is hereby granted, without written agreement and without
 * license or royalty fees, to use, copy, modify, and distribute this
 * software and its documentation for any purpose, provided that the
 * above copyright notice and the following two paragraphs appear in
 * all copies of this software.
 *
 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 *
 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
 *
 * Google Author(s): Behdad Esfahbod
 */

#ifndef HB_OT_HHEA_TABLE_HH
#define HB_OT_HHEA_TABLE_HH

#include "hb-open-type-private.hh"


namespace OT {


/*
 * hhea -- The Horizontal Header Table
 * vhea -- The Vertical Header Table
 */

#define HB_OT_TAG_hhea HB_TAG('h','h','e','a')
#define HB_OT_TAG_vhea HB_TAG('v','h','e','a')


struct _hea
{
  static const hb_tag_t tableTag = HB_TAG('_','h','e','a');

  static const hb_tag_t hheaTag = HB_OT_TAG_hhea;
  static const hb_tag_t vheaTag = HB_OT_TAG_vhea;

  inline bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    return_trace (c->check_struct (this) && likely (version.major == 1));
  }

  public:
  FixedVersion  version;                /* 0x00010000u for version 1.0. */
  FWORD         ascender;               /* Typographic ascent. */
  FWORD         descender;              /* Typographic descent. */
  FWORD         lineGap;                /* Typographic line gap. */
  UFWORD        advanceMax;             /* Maximum advance width/height value in
                                         * metrics table. */
  FWORD         minLeadingBearing;      /* Minimum left/top sidebearing value in
                                         * metrics table. */
  FWORD         minTrailingBearing;     /* Minimum right/bottom sidebearing value;
                                         * calculated as Min(aw - lsb -
                                         * (xMax - xMin)) for horizontal. */
  FWORD         maxExtent;              /* horizontal: Max(lsb + (xMax - xMin)),
                                         * vertical: minLeadingBearing+(yMax-yMin). */
  SHORT         caretSlopeRise;         /* Used to calculate the slope of the
                                         * cursor (rise/run); 1 for vertical caret,
                                         * 0 for horizontal.*/
  SHORT         caretSlopeRun;          /* 0 for vertical caret, 1 for horizontal. */
  SHORT         caretOffset;            /* The amount by which a slanted
                                         * highlight on a glyph needs
                                         * to be shifted to produce the
                                         * best appearance. Set to 0 for
                                         * non-slanted fonts. */
  SHORT         reserved1;              /* Set to 0. */
  SHORT         reserved2;              /* Set to 0. */
  SHORT         reserved3;              /* Set to 0. */
  SHORT         reserved4;              /* Set to 0. */
  SHORT         metricDataFormat;       /* 0 for current format. */
  USHORT        numberOfLongMetrics;    /* Number of LongMetric entries in metric
                                         * table. */
  public:
  DEFINE_SIZE_STATIC (36);
};

struct hhea : _hea {
  static const hb_tag_t tableTag        = HB_OT_TAG_hhea;
};
struct vhea : _hea {
  static const hb_tag_t tableTag        = HB_OT_TAG_vhea;
};


} /* namespace OT */


#endif /* HB_OT_HHEA_TABLE_HH */