text: /*
   * 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.h"
  
  HB_SHAPER_DATA_ENSURE_DECLARE(ot, face)
  
  /*
   * 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);
  }
  