kc3-lang/harfbuzz/src/hb-ot-vorg-table.hh

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• Hash : 9bd8d66c
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  Date : 2019-06-12T11:02:48
  

  [subset] VORG table to use _subset2 method and new iterator frameworks
  

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• src/hb-ot-vorg-table.hh

• /*
   * Copyright © 2018 Adobe 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.
   *
   * Adobe Author(s): Michiharu Ariza
   */
  
  #ifndef HB_OT_VORG_TABLE_HH
  #define HB_OT_VORG_TABLE_HH
  
  #include "hb-open-type.hh"
  
  /*
   * VORG -- Vertical Origin Table
   * https://docs.microsoft.com/en-us/typography/opentype/spec/vorg
   */
  #define HB_OT_TAG_VORG HB_TAG('V','O','R','G')
  
  namespace OT {
  
  struct VertOriginMetric
  {
    int cmp (hb_codepoint_t g) const { return glyph.cmp (g); }
  
    bool sanitize (hb_sanitize_context_t *c) const
    {
      TRACE_SANITIZE (this);
      return_trace (c->check_struct (this));
    }
  
    public:
    GlyphID	glyph;
    FWORD		vertOriginY;
  
    public:
    DEFINE_SIZE_STATIC (4);
  };
  
  struct VORG
  {
    static constexpr hb_tag_t tableTag = HB_OT_TAG_VORG;
  
    bool has_data () const { return version.to_int (); }
  
    int get_y_origin (hb_codepoint_t glyph) const
    {
      unsigned int i;
      if (!vertYOrigins.bfind (glyph, &i))
        return defaultVertOriginY;
      return vertYOrigins[i].vertOriginY;
    }
  
    template <typename Iterator,
              hb_requires (hb_is_iterator (Iterator))>
    void serialize (hb_serialize_context_t *c,
                    Iterator it,
                    FWORD defaultVertOriginY)
    {
  
      if (unlikely (!c->extend_min ((*this))))  return;
  
      this->version.major = 1;
      this->version.minor = 0;
  
      this->defaultVertOriginY = defaultVertOriginY;
      this->vertYOrigins.len = it.len ();
  
      + it
      | hb_apply ([c] (const VertOriginMetric& _) { c->copy (_);})
      ;
    }
  
    bool subset (hb_subset_context_t *c) const
    {
      TRACE_SUBSET (this);
      VORG *vorg_prime = c->serializer->start_embed<VORG> ();
      if (unlikely (!c->serializer->check_success (vorg_prime))) return_trace (false);
  
      auto it =
      + vertYOrigins.as_array ()
      | hb_filter (c->plan->glyphset (), &VertOriginMetric::glyph)
      | hb_map ([&] (const VertOriginMetric& _)
                {
                  hb_codepoint_t new_glyph = HB_SET_VALUE_INVALID;
                  c->plan->new_gid_for_old_gid (_.glyph, &new_glyph);
  
                  VertOriginMetric metric;
                  metric.glyph = new_glyph;
                  metric.vertOriginY = _.vertOriginY;
                  return metric;
                })
      ;
  
      /* serialize the new table */
      vorg_prime->serialize (c->serializer, it, defaultVertOriginY);
      return_trace (true);
    }
  
    bool sanitize (hb_sanitize_context_t *c) const
    {
      TRACE_SANITIZE (this);
      return_trace (c->check_struct (this) &&
                    version.major == 1 &&
                    vertYOrigins.sanitize (c));
    }
  
    protected:
    FixedVersion<>	version;		/* Version of VORG table. Set to 0x00010000u. */
    FWORD			defaultVertOriginY;	/* The default vertical origin. */
    SortedArrayOf<VertOriginMetric>
  			vertYOrigins;		/* The array of vertical origins. */
  
    public:
    DEFINE_SIZE_ARRAY(8, vertYOrigins);
  };
  } /* namespace OT */
  
  #endif /* HB_OT_VORG_TABLE_HH */
  

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