/*

 * Copyright © 2017  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_VAR_MVAR_TABLE_HH

#define HB_OT_VAR_MVAR_TABLE_HH

namespace OT {

struct VariationValueRecord

{

  {

    TRACE_SANITIZE (this);

    return_trace (c->check_struct (this));

  }

  public:

  Tag           valueTag;       /* Four-byte tag identifying a font-wide measure. */

  HBUINT32              varIdx;         /* Outer/inner index into VariationStore item. */

  public:

  DEFINE_SIZE_STATIC (8);

};

/*

 * MVAR -- Metrics Variations

 * https://docs.microsoft.com/en-us/typography/opentype/spec/mvar

 */

#define HB_OT_TAG_MVAR HB_TAG('M','V','A','R')

struct MVAR

{

  {

    TRACE_SANITIZE (this);

    return_trace (version.sanitize (c) &&

                  likely (version.major == 1) &&

                  c->check_struct (this) &&

                  valueRecordSize >= VariationValueRecord::static_size &&

                  varStore.sanitize (c, this) &&

  }

  {

    const VariationValueRecord *record;

                                               valueRecordCount, valueRecordSize,

                                               tag_compare);

    if (!record)

      return 0.;

    return (this+varStore).get_delta (record->varIdx, coords, coord_count);

  }

protected:

  {

    const hb_tag_t *a = (const hb_tag_t *) pa;

    const Tag *b = (const Tag *) pb;

    return b->cmp (*a);

  }

  protected:

  FixedVersion<>version;        /* Version of the metrics variation table

                                 * initially set to 0x00010000u */

  HBUINT16      reserved;       /* Not used; set to 0. */

  HBUINT16      valueRecordSize;/* The size in bytes of each value record —

                                 * must be greater than zero. */

  HBUINT16      valueRecordCount;/* The number of value records — may be zero. */

  OffsetTo<VariationStore>

                varStore;       /* Offset to item variation store table. */

                                 * in binary order of their valueTag field. */

  public:

};

} /* namespace OT */

#endif /* HB_OT_VAR_MVAR_TABLE_HH */