kc3-lang/harfbuzz/src/hb-ot-var-mvar-table.hh

• Show log

  Commit

• Hash : 9507b05a
  Author :
  Date : 2018-09-10T23:18:07
  

  Simplify sanitize->check_array()
  
  Fix a bug in CBDT sanitize, and redundant check in avar.
  

Download

• src/hb-ot-var-mvar-table.hh

• /*
   * Copyright © 2017  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_VAR_MVAR_TABLE_HH
  #define HB_OT_VAR_MVAR_TABLE_HH
  
  #include "hb-ot-layout-common.hh"
  
  
  namespace OT {
  
  
  struct VariationValueRecord
  {
    inline bool sanitize (hb_sanitize_context_t *c) const
    {
      TRACE_SANITIZE (this);
      return_trace (c->check_struct (this));
    }
  
    public:
    Tag		valueTag;	/* Four-byte tag identifying a font-wide measure. */
    HBUINT32		varIdx;		/* Outer/inner index into VariationStore item. */
  
    public:
    DEFINE_SIZE_STATIC (8);
  };
  
  
  /*
   * MVAR -- Metrics Variations
   * https://docs.microsoft.com/en-us/typography/opentype/spec/mvar
   */
  #define HB_OT_TAG_MVAR HB_TAG('M','V','A','R')
  
  struct MVAR
  {
    static const hb_tag_t tableTag	= HB_OT_TAG_MVAR;
  
    inline bool sanitize (hb_sanitize_context_t *c) const
    {
      TRACE_SANITIZE (this);
      return_trace (version.sanitize (c) &&
  		  likely (version.major == 1) &&
  		  c->check_struct (this) &&
  		  valueRecordSize >= VariationValueRecord::static_size &&
  		  varStore.sanitize (c, this) &&
  		  c->check_array (valuesZ.arrayZ, valueRecordCount, valueRecordSize));
    }
  
    inline float get_var (hb_tag_t tag,
  			int *coords, unsigned int coord_count) const
    {
      const VariationValueRecord *record;
      record = (VariationValueRecord *) bsearch (&tag, valuesZ.arrayZ,
  					       valueRecordCount, valueRecordSize,
  					       tag_compare);
      if (!record)
        return 0.;
  
      return (this+varStore).get_delta (record->varIdx, coords, coord_count);
    }
  
  protected:
    static inline int tag_compare (const void *pa, const void *pb)
    {
      const hb_tag_t *a = (const hb_tag_t *) pa;
      const Tag *b = (const Tag *) pb;
      return b->cmp (*a);
    }
  
    protected:
    FixedVersion<>version;	/* Version of the metrics variation table
  				 * initially set to 0x00010000u */
    HBUINT16	reserved;	/* Not used; set to 0. */
    HBUINT16	valueRecordSize;/* The size in bytes of each value record —
  				 * must be greater than zero. */
    HBUINT16	valueRecordCount;/* The number of value records — may be zero. */
    OffsetTo<VariationStore>
  		varStore;	/* Offset to item variation store table. */
    UnsizedArrayOf<HBUINT8>
  		valuesZ;	/* Array of value records. The records must be
  				 * in binary order of their valueTag field. */
  
    public:
    DEFINE_SIZE_ARRAY (12, valuesZ);
  };
  
  } /* namespace OT */
  
  
  #endif /* HB_OT_VAR_MVAR_TABLE_HH */
  

Download