/*

 * Copyright © 2010  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_SHAPE_HH

#define HB_OT_SHAPE_HH

#include "hb.hh"

#include "hb-ot-map.hh"

#include "hb-ot-layout.hh"

struct hb_ot_shape_plan_t

{

  hb_segment_properties_t props;

  const struct hb_ot_complex_shaper_t *shaper;

  hb_ot_map_t map;

  const void *data;

  hb_mask_t rtlm_mask, frac_mask, numr_mask, dnom_mask;

  hb_mask_t kern_mask;

  unsigned int has_frac : 1;

  unsigned int has_kern : 1;

  unsigned int has_mark : 1;

  inline void collect_lookups (hb_tag_t table_tag, hb_set_t *lookups) const

  {

    unsigned int table_index;

    switch (table_tag) {

      case HB_OT_TAG_GSUB: table_index = 0; break;

      case HB_OT_TAG_GPOS: table_index = 1; break;

      default: return;

    }

    map.collect_lookups (table_index, lookups);

  }

  inline void substitute (hb_font_t *font, hb_buffer_t *buffer) const { map.substitute (this, font, buffer); }

  inline void position (hb_font_t *font, hb_buffer_t *buffer) const { map.position (this, font, buffer); }

  void init (void)

  {

    memset (this, 0, sizeof (*this));

    map.init ();

  }

  void fini (void) {

    map.fini ();

  }

};

struct hb_ot_shape_planner_t

{

  /* In the order that they are filled in. */

  hb_face_t *face;

  hb_segment_properties_t props;

  const struct hb_ot_complex_shaper_t *shaper;

  hb_ot_map_builder_t map;

  hb_ot_shape_planner_t (const hb_shape_plan_t *master_plan) :

       face (master_plan->face_unsafe),

       props (master_plan->props),

       shaper (nullptr),

       map (face, &props) {}

  inline void compile (hb_ot_shape_plan_t &plan,

           const int          *coords,

           unsigned int        num_coords)

  {

    plan.props = props;

    plan.shaper = shaper;

    map.compile (plan.map, coords, num_coords);

    plan.rtlm_mask = plan.map.get_1_mask (HB_TAG ('r','t','l','m'));

    plan.frac_mask = plan.map.get_1_mask (HB_TAG ('f','r','a','c'));

    plan.numr_mask = plan.map.get_1_mask (HB_TAG ('n','u','m','r'));

    plan.dnom_mask = plan.map.get_1_mask (HB_TAG ('d','n','o','m'));

    plan.kern_mask = plan.map.get_mask (HB_DIRECTION_IS_HORIZONTAL (plan.props.direction) ?

          HB_TAG ('k','e','r','n') : HB_TAG ('v','k','r','n'));

    plan.has_frac = plan.frac_mask || (plan.numr_mask && plan.dnom_mask);

    plan.has_kern = !!plan.kern_mask;

    plan.has_mark = !!plan.map.get_1_mask (HB_TAG ('m','a','r','k'));

  }

  private:

  HB_DISALLOW_COPY_AND_ASSIGN (hb_ot_shape_planner_t);

};

#endif /* HB_OT_SHAPE_HH */