harfbuzz/src/hb-aat-layout.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.hh"

#include "hb-ot-face.hh"
#include "hb-aat-layout.hh"
#include "hb-aat-layout-ankr-table.hh"
#include "hb-aat-layout-bsln-table.hh" // Just so we compile it; unused otherwise.
#include "hb-aat-layout-feat-table.hh" // Just so we compile it; unused otherwise.
#include "hb-aat-layout-kerx-table.hh"
#include "hb-aat-layout-morx-table.hh"
#include "hb-aat-layout-trak-table.hh"
#include "hb-aat-ltag-table.hh" // Just so we compile it; unused otherwise.

/*
 * morx/kerx/trak
 */

static inline const AAT::morx&
_get_morx (hb_face_t *face, hb_blob_t **blob = nullptr)
{
  if (unlikely (!hb_ot_shaper_face_data_ensure (face)))
  {
    if (blob)
      *blob = hb_blob_get_empty ();
    return Null(AAT::morx);
  }
  const AAT::morx& morx = *(hb_ot_face_data (face)->morx.get ());
  if (blob)
    *blob = hb_ot_face_data (face)->morx.get_blob ();
  return morx;
}
static inline const AAT::kerx&
_get_kerx (hb_face_t *face, hb_blob_t **blob = nullptr)
{
  if (unlikely (!hb_ot_shaper_face_data_ensure (face)))
  {
    if (blob)
      *blob = hb_blob_get_empty ();
    return Null(AAT::kerx);
  }
  const AAT::kerx& kerx = *(hb_ot_face_data (face)->kerx.get ());
  if (blob)
    *blob = hb_ot_face_data (face)->kerx.get_blob ();
  return kerx;
}
static inline const AAT::ankr&
_get_ankr (hb_face_t *face, hb_blob_t **blob = nullptr)
{
  if (unlikely (!hb_ot_shaper_face_data_ensure (face)))
  {
    if (blob)
      *blob = hb_blob_get_empty ();
    return Null(AAT::ankr);
  }
  const AAT::ankr& ankr = *(hb_ot_face_data (face)->ankr.get ());
  if (blob)
    *blob = hb_ot_face_data (face)->ankr.get_blob ();
  return ankr;
}
static inline const AAT::trak&
_get_trak (hb_face_t *face)
{
  if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return Null(AAT::trak);
  return *(hb_ot_face_data (face)->trak.get ());
}


hb_bool_t
hb_aat_layout_has_substitution (hb_face_t *face)
{
  return _get_morx (face).has_data ();
}

void
hb_aat_layout_substitute (hb_ot_shape_plan_t *plan,
			  hb_font_t *font,
			  hb_buffer_t *buffer)
{
  hb_blob_t *blob;
  const AAT::morx& morx = _get_morx (font->face, &blob);

  AAT::hb_aat_apply_context_t c (plan, font, buffer, blob);
  morx.apply (&c);
}


hb_bool_t
hb_aat_layout_has_positioning (hb_face_t *face)
{
  return _get_kerx (face).has_data ();
}

void
hb_aat_layout_position (hb_ot_shape_plan_t *plan,
			hb_font_t *font,
			hb_buffer_t *buffer)
{
  hb_blob_t *blob;
  const AAT::kerx& kerx = _get_kerx (font->face, &blob);

  hb_blob_t *ankr_blob;
  const AAT::ankr& ankr = _get_ankr (font->face, &ankr_blob);

  AAT::hb_aat_apply_context_t c (plan, font, buffer, blob,
				 ankr, ankr_blob->data + ankr_blob->length);
  kerx.apply (&c);
}

hb_bool_t
hb_aat_layout_has_tracking (hb_face_t *face)
{
  return _get_trak (face).has_data ();
}

void
hb_aat_layout_track (hb_ot_shape_plan_t *plan,
		     hb_font_t *font,
		     hb_buffer_t *buffer)
{
  const AAT::trak& trak = _get_trak (font->face);

  AAT::hb_aat_apply_context_t c (plan, font, buffer);
  trak.apply (&c);
}