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

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• Hash : ac1bb3e3
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  Date : 2022-01-20T11:47:17
  

  [machinery] Move accelerators to constructor/destructor
  

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• src/hb-ot-meta-table.hh

• /*
   * Copyright © 2019  Ebrahim Byagowi
   *
   *  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.
   */
  
  #ifndef HB_OT_META_TABLE_HH
  #define HB_OT_META_TABLE_HH
  
  #include "hb-open-type.hh"
  
  /*
   * meta -- Metadata Table
   * https://docs.microsoft.com/en-us/typography/opentype/spec/meta
   * https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6meta.html
   */
  #define HB_OT_TAG_meta HB_TAG ('m','e','t','a')
  
  
  namespace OT {
  
  
  struct DataMap
  {
    int cmp (hb_tag_t a) const { return tag.cmp (a); }
  
    hb_tag_t get_tag () const { return tag; }
  
    hb_blob_t *reference_entry (hb_blob_t *meta_blob) const
    { return hb_blob_create_sub_blob (meta_blob, dataZ, dataLength); }
  
    bool sanitize (hb_sanitize_context_t *c, const void *base) const
    {
      TRACE_SANITIZE (this);
      return_trace (likely (c->check_struct (this) &&
  			  dataZ.sanitize (c, base, dataLength)));
    }
  
    protected:
    Tag		tag;		/* A tag indicating the type of metadata. */
    NNOffset32To<UnsizedArrayOf<HBUINT8>>
  		dataZ;		/* Offset in bytes from the beginning of the
  				 * metadata table to the data for this tag. */
    HBUINT32	dataLength;	/* Length of the data. The data is not required to
  				 * be padded to any byte boundary. */
    public:
    DEFINE_SIZE_STATIC (12);
  };
  
  struct meta
  {
    static constexpr hb_tag_t tableTag = HB_OT_TAG_meta;
  
    struct accelerator_t
    {
      accelerator_t (hb_face_t *face)
      { table = hb_sanitize_context_t ().reference_table<meta> (face); }
      ~accelerator_t () { table.destroy (); }
  
      hb_blob_t *reference_entry (hb_tag_t tag) const
      { return table->dataMaps.lsearch (tag).reference_entry (table.get_blob ()); }
  
      unsigned int get_entries (unsigned int      start_offset,
  			      unsigned int     *count,
  			      hb_ot_meta_tag_t *entries) const
      {
        if (count)
        {
  	+ table->dataMaps.sub_array (start_offset, count)
  	| hb_map (&DataMap::get_tag)
  	| hb_map ([](hb_tag_t tag) { return (hb_ot_meta_tag_t) tag; })
  	| hb_sink (hb_array (entries, *count))
  	;
        }
        return table->dataMaps.len;
      }
  
      private:
      hb_blob_ptr_t<meta> table;
    };
  
    bool sanitize (hb_sanitize_context_t *c) const
    {
      TRACE_SANITIZE (this);
      return_trace (likely (c->check_struct (this) &&
  			  version == 1 &&
  			  dataMaps.sanitize (c, this)));
    }
  
    protected:
    HBUINT32	version;	/* Version number of the metadata table — set to 1. */
    HBUINT32	flags;		/* Flags — currently unused; set to 0. */
    HBUINT32	dataOffset;
  				/* Per Apple specification:
  				 * Offset from the beginning of the table to the data.
  				 * Per OT specification:
  				 * Reserved. Not used; should be set to 0. */
    Array32Of<DataMap>
  		dataMaps;/* Array of data map records. */
    public:
    DEFINE_SIZE_ARRAY (16, dataMaps);
  };
  
  struct meta_accelerator_t : meta::accelerator_t {
    meta_accelerator_t (hb_face_t *face) : meta::accelerator_t (face) {}
  };
  
  } /* namespace OT */
  
  
  #endif /* HB_OT_META_TABLE_HH */
  

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