src/hb-ot-var.cc

/*
 * 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-fvar-table.hh"
#include "hb-ot-var.h"

HB_SHAPER_DATA_ENSURE_DECLARE(ot, face)

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 ());
}

/*
 * fvar/avar
 */

/**
 * 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);
}

unsigned int
hb_ot_var_get_axis_count (hb_face_t *face)
{
  const OT::fvar &fvar = _get_fvar (face);
  return fvar.get_axis_count ();
}

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_EXTERN 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_EXTERN int
hb_ot_var_normalize_axis_value (hb_face_t    *face,
				unsigned int  axis_index,
				float         v)
{
  const OT::fvar &fvar = _get_fvar (face);
  return fvar.normalize_axis_value (axis_index, v);
}