/*

 * 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

 */

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

#include "hb-ot-layout-private.hh"

#include "hb-ot-var-avar-table.hh"

#include "hb-ot-var-fvar-table.hh"

#include "hb-ot-var-mvar-table.hh"

#include "hb-ot-var.h"

/*

 * fvar/avar

 */

static inline const OT::fvar&

_get_fvar (hb_face_t *face)

{

  if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return OT::Null(OT::fvar);

  hb_ot_layout_t * layout = hb_ot_layout_from_face (face);

  return *(layout->fvar.get ());

}

static inline const OT::avar&

_get_avar (hb_face_t *face)

{

  if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return OT::Null(OT::avar);

  hb_ot_layout_t * layout = hb_ot_layout_from_face (face);

  return *(layout->avar.get ());

}

/**

 * hb_ot_var_has_data:

 * @face: #hb_face_t to test

 *

 * This function allows to verify the presence of OpenType variation data on the face.

 * Alternatively, use hb_ot_var_get_axis_count().

 *

 * Return value: true if face has a `fvar' table and false otherwise

 *

 * Since: 1.4.2

 **/

hb_bool_t

hb_ot_var_has_data (hb_face_t *face)

{

  return &_get_fvar (face) != &OT::Null(OT::fvar);

}

/**

 * hb_ot_var_get_axis_count:

 *

 * Since: 1.4.2

 **/

unsigned int

hb_ot_var_get_axis_count (hb_face_t *face)

{

  const OT::fvar &fvar = _get_fvar (face);

  return fvar.get_axis_count ();

}

/**

 * hb_ot_var_get_axes:

 *

 * Since: 1.4.2

 **/

unsigned int

hb_ot_var_get_axes (hb_face_t        *face,

		    unsigned int      start_offset,

		    unsigned int     *axes_count /* IN/OUT */,

		    hb_ot_var_axis_t *axes_array /* OUT */)

{

  const OT::fvar &fvar = _get_fvar (face);

  return fvar.get_axis_infos (start_offset, axes_count, axes_array);

}

/**

 * hb_ot_var_find_axis:

 *

 * Since: 1.4.2

 **/

hb_bool_t

hb_ot_var_find_axis (hb_face_t        *face,

		     hb_tag_t          axis_tag,

		     unsigned int     *axis_index,

		     hb_ot_var_axis_t *axis_info)

{

  const OT::fvar &fvar = _get_fvar (face);

  return fvar.find_axis (axis_tag, axis_index, axis_info);

}

/**

 * hb_ot_var_normalize_variations:

 *

 * Since: 1.4.2

 **/

void

hb_ot_var_normalize_variations (hb_face_t            *face,

				const hb_variation_t *variations, /* IN */

				unsigned int          variations_length,

				int                  *coords, /* OUT */

				unsigned int          coords_length)

{

  for (unsigned int i = 0; i < coords_length; i++)

    coords[i] = 0;

  const OT::fvar &fvar = _get_fvar (face);

  for (unsigned int i = 0; i < variations_length; i++)

  {

    unsigned int axis_index;

    if (hb_ot_var_find_axis (face, variations[i].tag, &axis_index, NULL) &&

	axis_index < coords_length)

      coords[axis_index] = fvar.normalize_axis_value (axis_index, variations[i].value);

  }

  const OT::avar &avar = _get_avar (face);

  avar.map_coords (coords, coords_length);

}

/**

 * hb_ot_var_normalize_coords:

 *

 * Since: 1.4.2

 **/

void

hb_ot_var_normalize_coords (hb_face_t    *face,

			    unsigned int coords_length,

			    const float *design_coords, /* IN */

			    int *normalized_coords /* OUT */)

{

  const OT::fvar &fvar = _get_fvar (face);

  for (unsigned int i = 0; i < coords_length; i++)

    normalized_coords[i] = fvar.normalize_axis_value (i, design_coords[i]);

  const OT::avar &avar = _get_avar (face);

  avar.map_coords (normalized_coords, coords_length);

}