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

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• Hash : aaecaa4c
  Author :
  Date : 2025-02-24T22:03:00
  

  [vector] Disallow accidental creation of transient vectors
  
  Fix sites that were doing this under our feet.
  
  This lowers precision of some instancing operations from double
  to float, which modifies a few results by rounding error.
  
  TODO: Update tests.
  

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• src/hb-ot-hdmx-table.hh

• /*
   * 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): Garret Rieger
   */
  
  #ifndef HB_OT_HDMX_TABLE_HH
  #define HB_OT_HDMX_TABLE_HH
  
  #include "hb-open-type.hh"
  
  /*
   * hdmx -- Horizontal Device Metrics
   * https://docs.microsoft.com/en-us/typography/opentype/spec/hdmx
   */
  #define HB_OT_TAG_hdmx HB_TAG('h','d','m','x')
  
  
  namespace OT {
  
  
  struct DeviceRecord
  {
    static unsigned int get_size (unsigned count)
    { return hb_ceil_to_4 (min_size + count * HBUINT8::static_size); }
  
    template<typename Iterator,
  	   hb_requires (hb_is_iterator (Iterator))>
    bool serialize (hb_serialize_context_t *c,
  		  unsigned pixelSize,
  		  Iterator it,
  		  const hb_vector_t<hb_codepoint_pair_t> new_to_old_gid_list,
  		  unsigned num_glyphs)
    {
      TRACE_SERIALIZE (this);
  
      if (unlikely (!c->extend (this, num_glyphs)))  return_trace (false);
  
      this->pixelSize = pixelSize;
      this->maxWidth =
      + it
      | hb_reduce (hb_max, 0u);
  
      for (auto &_ : new_to_old_gid_list)
        widthsZ[_.first] = *it++;
  
      return_trace (true);
    }
  
    bool sanitize (hb_sanitize_context_t *c, unsigned sizeDeviceRecord) const
    {
      TRACE_SANITIZE (this);
      return_trace (likely (c->check_struct (this) &&
  			  hb_barrier () &&
  			  c->check_range (this, sizeDeviceRecord)));
    }
  
    HBUINT8			pixelSize;	/* Pixel size for following widths (as ppem). */
    HBUINT8			maxWidth;	/* Maximum width. */
    UnsizedArrayOf<HBUINT8>	widthsZ;	/* Array of widths (numGlyphs is from the 'maxp' table). */
    public:
    DEFINE_SIZE_UNBOUNDED (2);
  };
  
  
  struct hdmx
  {
    static constexpr hb_tag_t tableTag = HB_OT_TAG_hdmx;
  
    unsigned int get_size () const
    { return min_size + numRecords * sizeDeviceRecord; }
  
    template<typename Iterator,
  	   hb_requires (hb_is_iterator (Iterator))>
    bool serialize (hb_serialize_context_t *c,
  		  unsigned version,
  		  Iterator it,
  		  hb_array_t<const hb_codepoint_pair_t> new_to_old_gid_list,
  		  unsigned num_glyphs)
    {
      TRACE_SERIALIZE (this);
  
      if (unlikely (!c->extend_min ((*this))))  return_trace (false);
  
      this->version = version;
      this->numRecords = it.len ();
      this->sizeDeviceRecord = DeviceRecord::get_size (num_glyphs);
  
      for (const hb_item_type<Iterator>& _ : +it)
        c->start_embed<DeviceRecord> ()->serialize (c, _.first, _.second, new_to_old_gid_list, num_glyphs);
  
      return_trace (c->successful ());
    }
  
  
    bool subset (hb_subset_context_t *c) const
    {
      TRACE_SUBSET (this);
  
      auto *hdmx_prime = c->serializer->start_embed <hdmx> ();
  
      unsigned num_input_glyphs = get_num_glyphs ();
      auto it =
      + hb_range ((unsigned) numRecords)
      | hb_map ([c, num_input_glyphs, this] (unsigned _)
  	{
  	  const DeviceRecord *device_record =
  	    &StructAtOffset<DeviceRecord> (&firstDeviceRecord,
  					   _ * sizeDeviceRecord);
  	  auto row =
  	    + hb_iter (c->plan->new_to_old_gid_list)
  	    | hb_map ([num_input_glyphs, device_record] (hb_codepoint_pair_t _)
  		      {
  			return device_record->widthsZ.as_array (num_input_glyphs) [_.second];
  		      })
  	    ;
  	  return hb_pair ((unsigned) device_record->pixelSize, +row);
  	})
      ;
  
      hdmx_prime->serialize (c->serializer, version, it,
  			   c->plan->new_to_old_gid_list,
  			   c->plan->num_output_glyphs ());
      return_trace (true);
    }
  
    unsigned get_num_glyphs () const
    {
      return sizeDeviceRecord - DeviceRecord::min_size;
    }
  
    bool sanitize (hb_sanitize_context_t *c) const
    {
      TRACE_SANITIZE (this);
      return_trace (c->check_struct (this) &&
  		  hb_barrier () &&
  		  !hb_unsigned_mul_overflows (numRecords, sizeDeviceRecord) &&
                    min_size + numRecords * sizeDeviceRecord > numRecords * sizeDeviceRecord &&
  		  sizeDeviceRecord >= DeviceRecord::min_size &&
  		  c->check_range (this, get_size ()));
    }
  
    protected:
    HBUINT16	version;	/* Table version number (0) */
    HBUINT16	numRecords;	/* Number of device records. */
    HBUINT32	sizeDeviceRecord;
  				/* Size of a device record, 32-bit aligned. */
    DeviceRecord	firstDeviceRecord;
  				/* Array of device records. */
    public:
    DEFINE_SIZE_MIN (8);
  };
  
  } /* namespace OT */
  
  
  #endif /* HB_OT_HDMX_TABLE_HH */
  

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