hb-aat-map.hh - mozsearch

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/*

 * Copyright © 2018  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_AAT_MAP_HH

#define HB_AAT_MAP_HH

#include "hb.hh"

struct hb_aat_map_t

  friend struct hb_aat_map_builder_t;

  public:

  struct range_flags_t

    hb_mask_t flags;

    unsigned cluster_first;

    unsigned cluster_last; // end - 1

};

  public:

  hb_vector_t<hb_sorted_vector_t<range_flags_t>> chain_flags;

};

struct hb_aat_map_builder_t

  public:

  HB_INTERNAL hb_aat_map_builder_t (hb_face_t *face_,

				    const hb_segment_properties_t props_) :

				      face (face_),

				      props (props_) {}

  HB_INTERNAL void add_feature (const hb_feature_t &feature);

  HB_INTERNAL void compile (hb_aat_map_t  &m);

  public:

  struct feature_info_t

    hb_aat_layout_feature_type_t  type;

    hb_aat_layout_feature_selector_t  setting;

    bool is_exclusive;

    unsigned  seq; /* For stable sorting only. */

    HB_INTERNAL static int cmp (const void *pa, const void *pb)

      const feature_info_t *a = (const feature_info_t *) pa;

      const feature_info_t *b = (const feature_info_t *) pb;

      if (a->type != b->type) return (a->type < b->type ? -1 : 1);

      if (!a->is_exclusive &&

	  (a->setting & ~1) != (b->setting & ~1)) return (a->setting < b->setting ? -1 : 1);

	    return (a->seq < b->seq ? -1 : a->seq > b->seq ? 1 : 0);

    /* compares type & setting only */

    int cmp (const feature_info_t& f) const

      return (f.type != type) ? (f.type < type ? -1 : 1) :

	     (f.setting != setting) ? (f.setting < setting ? -1 : 1) : 0;

};

  struct feature_range_t

    feature_info_t info;

    unsigned start;

    unsigned end;

};

  private:

  struct feature_event_t

    unsigned int index;

    bool start;

    feature_info_t feature;

    HB_INTERNAL static int cmp (const void *pa, const void *pb) {

      const feature_event_t *a = (const feature_event_t *) pa;

      const feature_event_t *b = (const feature_event_t *) pb;

      return a->index < b->index ? -1 : a->index > b->index ? 1 :

	     a->start < b->start ? -1 : a->start > b->start ? 1 :

	     feature_info_t::cmp (&a->feature, &b->feature);

};

  public:

  hb_face_t *face;

  hb_segment_properties_t props;

  public:

  hb_sorted_vector_t<feature_range_t> features;

  hb_sorted_vector_t<feature_info_t> current_features;

  unsigned range_first = HB_FEATURE_GLOBAL_START;

  unsigned range_last = HB_FEATURE_GLOBAL_END;

};

#endif /* HB_AAT_MAP_HH */