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

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• Hash : b986c6a3
  Author :
  Date : 2019-03-29T20:17:46
  

  [C++11] Remove IntType::set() in favor of operator=
  

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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;
    }
  
    bool _subset (const hb_subset_plan_t *plan HB_UNUSED,
  		const VORG *vorg_table,
  		const hb_vector_t<VertOriginMetric> &subset_metrics,
  		unsigned int dest_sz,
  		void *dest) const
    {
      hb_serialize_context_t c (dest, dest_sz);
  
      VORG *subset_table = c.start_serialize<VORG> ();
      if (unlikely (!c.extend_min (*subset_table)))
        return false;
  
      subset_table->version.major = 1;
      subset_table->version.minor = 0;
  
      subset_table->defaultVertOriginY = vorg_table->defaultVertOriginY;
      subset_table->vertYOrigins.len = subset_metrics.length;
  
      bool success = true;
      if (subset_metrics.length > 0)
      {
        unsigned int  size = VertOriginMetric::static_size * subset_metrics.length;
        VertOriginMetric  *metrics = c.allocate_size<VertOriginMetric> (size);
        if (likely (metrics != nullptr))
          memcpy (metrics, &subset_metrics[0], size);
        else
          success = false;
      }
      c.end_serialize ();
  
      return success;
    }
  
    bool subset (hb_subset_plan_t *plan) const
    {
      hb_blob_t *vorg_blob = hb_sanitize_context_t().reference_table<VORG> (plan->source);
      const VORG *vorg_table = vorg_blob->as<VORG> ();
  
      /* count the number of glyphs to be included in the subset table */
      hb_vector_t<VertOriginMetric> subset_metrics;
      subset_metrics.init ();
  
  
      hb_codepoint_t old_glyph = HB_SET_VALUE_INVALID;
      unsigned int i = 0;
      while (i < vertYOrigins.len
             && plan->glyphset ()->next (&old_glyph))
      {
        while (old_glyph > vertYOrigins[i].glyph)
        {
          i++;
          if (i >= vertYOrigins.len)
            break;
        }
  
        if (old_glyph == vertYOrigins[i].glyph)
        {
          hb_codepoint_t new_glyph;
          if (plan->new_gid_for_old_gid (old_glyph, &new_glyph))
          {
            VertOriginMetric *metrics = subset_metrics.push ();
            metrics->glyph = new_glyph;
            metrics->vertOriginY = vertYOrigins[i].vertOriginY;
          }
        }
      }
  
      /* alloc the new table */
      unsigned int dest_sz = VORG::min_size + VertOriginMetric::static_size * subset_metrics.length;
      void *dest = (void *) malloc (dest_sz);
      if (unlikely (!dest))
      {
        subset_metrics.fini ();
        hb_blob_destroy (vorg_blob);
        return false;
      }
  
      /* serialize the new table */
      if (!_subset (plan, vorg_table, subset_metrics, dest_sz, dest))
      {
        subset_metrics.fini ();
        free (dest);
        hb_blob_destroy (vorg_blob);
        return false;
      }
  
      hb_blob_t *result = hb_blob_create ((const char *)dest,
                                          dest_sz,
                                          HB_MEMORY_MODE_READONLY,
                                          dest,
                                          free);
      bool success = plan->add_table (HB_OT_TAG_VORG, result);
      hb_blob_destroy (result);
      subset_metrics.fini ();
      hb_blob_destroy (vorg_blob);
      return success;
    }
  
    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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