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

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• Hash : 277e3289
  Author :
  Date : 2018-04-17T09:13:35
  

  Make some of implicit header uses explicit (#989)
  
  Splitted from #950 and #986 IIRC Chromium had a policy about this encouraging it,
  not sure about automated way to detect and add them but for now lets have the needed
  ones of them.

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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-private.hh"
  #include "hb-subset-plan.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
  {
    struct SubsetView
    {
      const DeviceRecord *source_device_record;
      unsigned int size_device_record;
      hb_subset_plan_t *subset_plan;
  
      inline void init(const DeviceRecord *source_device_record,
  		     unsigned int size_device_record,
  		     hb_subset_plan_t   *subset_plan)
      {
        this->source_device_record = source_device_record;
        this->size_device_record = size_device_record;
        this->subset_plan = subset_plan;
      }
  
      inline unsigned int len () const
      {
        return this->subset_plan->gids_to_retain_sorted.len;
      }
  
      inline const HBUINT8* operator [] (unsigned int i) const
      {
        if (unlikely (i >= len())) return nullptr;
        hb_codepoint_t gid = this->subset_plan->gids_to_retain_sorted [i];
  
        const HBUINT8* width = &(this->source_device_record->widths[gid]);
  
        if (width < ((const HBUINT8 *) this->source_device_record) + size_device_record)
  	return width;
        else
  	return nullptr;
      }
    };
  
    static inline unsigned int get_size (unsigned int count)
    {
      unsigned int raw_size = min_size + count * HBUINT8::static_size;
      if (raw_size % 4)
        /* Align to 32 bits */
        return raw_size + (4 - (raw_size % 4));
      return raw_size;
    }
  
    inline bool serialize (hb_serialize_context_t *c, const SubsetView &subset_view)
    {
      TRACE_SERIALIZE (this);
  
      if (unlikely (!c->allocate_size<DeviceRecord> (get_size (subset_view.len()))))
        return_trace (false);
  
      this->pixel_size.set (subset_view.source_device_record->pixel_size);
      this->max_width.set (subset_view.source_device_record->max_width);
  
      for (unsigned int i = 0; i < subset_view.len(); i++)
      {
        const HBUINT8 *width = subset_view[i];
        if (!width)
        {
  	DEBUG_MSG(SUBSET, nullptr, "HDMX width for new gid %d is missing.", i);
  	return_trace (false);
        }
        widths[i].set (*width);
      }
  
      return_trace (true);
    }
  
    inline bool sanitize (hb_sanitize_context_t *c, unsigned int size_device_record) const
    {
      TRACE_SANITIZE (this);
      return_trace (likely (c->check_struct (this) &&
  			  c->check_range (this, size_device_record)));
    }
  
    HBUINT8 pixel_size;   /* Pixel size for following widths (as ppem). */
    HBUINT8 max_width;    /* Maximum width. */
    HBUINT8 widths[VAR];  /* Array of widths (numGlyphs is from the 'maxp' table). */
    public:
    DEFINE_SIZE_ARRAY (2, widths);
  };
  
  
  struct hdmx
  {
    static const hb_tag_t tableTag = HB_OT_TAG_hdmx;
  
    inline unsigned int get_size (void) const
    {
      return min_size + num_records * size_device_record;
    }
  
    inline const DeviceRecord& operator [] (unsigned int i) const
    {
      if (unlikely (i >= num_records)) return Null(DeviceRecord);
      return StructAtOffset<DeviceRecord> (this->data, i * size_device_record);
    }
  
    inline bool serialize (hb_serialize_context_t *c, const hdmx *source_hdmx, hb_subset_plan_t *plan)
    {
      TRACE_SERIALIZE (this);
  
      if (unlikely (!c->extend_min ((*this))))  return_trace (false);
  
      this->version.set (source_hdmx->version);
      this->num_records.set (source_hdmx->num_records);
      this->size_device_record.set (DeviceRecord::get_size (plan->gids_to_retain_sorted.len));
  
      for (unsigned int i = 0; i < source_hdmx->num_records; i++)
      {
        DeviceRecord::SubsetView subset_view;
        subset_view.init (&(*source_hdmx)[i], source_hdmx->size_device_record, plan);
  
        if (!c->start_embed<DeviceRecord> ()->serialize (c, subset_view))
  	return_trace (false);
      }
  
      return_trace (true);
    }
  
    static inline size_t get_subsetted_size (hb_subset_plan_t *plan)
    {
      return min_size + DeviceRecord::get_size (plan->gids_to_retain_sorted.len);
    }
  
    inline bool subset (hb_subset_plan_t *plan) const
    {
      size_t dest_size = get_subsetted_size (plan);
      hdmx *dest = (hdmx *) malloc (dest_size);
      if (unlikely (!dest))
      {
        DEBUG_MSG(SUBSET, nullptr, "Unable to alloc %lu for hdmx subset output.", (unsigned long) dest_size);
        return false;
      }
  
      hb_serialize_context_t c (dest, dest_size);
      hdmx *hdmx_prime = c.start_serialize<hdmx> ();
      if (!hdmx_prime || !hdmx_prime->serialize (&c, this, plan)) {
        free (dest);
        return false;
      }
      c.end_serialize ();
  
      hb_blob_t *hdmx_prime_blob = hb_blob_create ((const char *) dest,
  						 dest_size,
  						 HB_MEMORY_MODE_READONLY,
  						 dest,
  						 free);
      bool result = hb_subset_plan_add_table (plan, HB_OT_TAG_hdmx, hdmx_prime_blob);
      hb_blob_destroy (hdmx_prime_blob);
  
      return result;
    }
  
    inline bool sanitize (hb_sanitize_context_t *c) const
    {
      TRACE_SANITIZE (this);
      return_trace (c->check_struct (this) && version == 0 &&
  		  !_hb_unsigned_int_mul_overflows (num_records, size_device_record) &&
  		  size_device_record >= DeviceRecord::min_size &&
  		  c->check_range (this, get_size()));
    }
  
    protected:
    HBUINT16	version;		/* Table version number (0) */
    HBUINT16	num_records;		/* Number of device records. */
    HBUINT32	size_device_record;	/* Size of a device record, 32-bit aligned. */
    HBUINT8	data[VAR];		/* Array of device records. */
    public:
    DEFINE_SIZE_ARRAY (8, data);
  };
  
  } /* namespace OT */
  
  
  #endif /* HB_OT_HDMX_TABLE_HH */
  

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