kc3-lang/harfbuzz/src/hb-buffer-serialize.cc

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• Hash : d3e14aaf
  Author :
  Date : 2013-02-27T11:06:36
  

  [buffer] Move buffer serialization code to a new file
  

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• src/hb-buffer-serialize.cc

• /*
   * Copyright © 2012,2013  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
   */
  
  #include "hb-buffer-private.hh"
  
  
  static const char *serialize_formats[] = {
    "text",
    "json",
    NULL
  };
  
  const char **
  hb_buffer_serialize_list_formats (void)
  {
    return serialize_formats;
  }
  
  hb_buffer_serialize_format_t
  hb_buffer_serialize_format_from_string (const char *str, int len)
  {
    /* Upper-case it. */
    return (hb_buffer_serialize_format_t) (hb_tag_from_string (str, len) & ~0x20202020);
  }
  
  const char *
  hb_buffer_serialize_format_to_string (hb_buffer_serialize_format_t format)
  {
    switch (format)
    {
      case HB_BUFFER_SERIALIZE_FORMAT_TEXT:	return serialize_formats[0];
      case HB_BUFFER_SERIALIZE_FORMAT_JSON:	return serialize_formats[1];
      default:
      case HB_BUFFER_SERIALIZE_FORMAT_INVALID:	return NULL;
    }
  }
  
  static unsigned int
  _hb_buffer_serialize_glyphs_json (hb_buffer_t *buffer,
  				  unsigned int start,
  				  unsigned int end,
  				  char *buf,
  				  unsigned int buf_size,
  				  unsigned int *buf_consumed,
  				  hb_font_t *font,
  				  hb_buffer_serialize_flags_t flags)
  {
    hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, NULL);
    hb_glyph_position_t *pos = hb_buffer_get_glyph_positions (buffer, NULL);
  
    *buf_consumed = 0;
    for (unsigned int i = start; i < end; i++)
    {
      char b[1024];
      char *p = b;
  
      /* In the following code, we know b is large enough that no overflow can happen. */
  
  #define APPEND(s) HB_STMT_START { strcpy (p, s); p += strlen (s); } HB_STMT_END
  
      if (i)
        *p++ = ',';
  
      *p++ = '{';
  
      APPEND ("\"g\":");
      if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_GLYPH_NAMES))
      {
        char g[128];
        hb_font_glyph_to_string (font, info[i].codepoint, g, sizeof (g));
        *p++ = '"';
        for (char *q = g; *q; q++) {
          if (*q == '"')
  	  *p++ = '\\';
  	*p++ = *q;
        }
        *p++ = '"';
      }
      else
        p += snprintf (p, ARRAY_LENGTH (b) - (p - b), "%u", info[i].codepoint);
  
      if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_CLUSTERS)) {
        p += snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"cl\":%u", info[i].cluster);
      }
  
      if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS))
      {
        p += snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"dx\":%d,\"dy\":%d",
  		     pos[i].x_offset, pos[i].y_offset);
        p += snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"ax\":%d,\"ay\":%d",
  		     pos[i].x_advance, pos[i].y_advance);
      }
  
      *p++ = '}';
  
      if (buf_size > (p - b))
      {
        unsigned int l = p - b;
        memcpy (buf, b, l);
        buf += l;
        buf_size -= l;
        *buf_consumed += l;
        *buf = '\0';
      } else
        return i - start;
    }
  
    return end - start;
  }
  
  static unsigned int
  _hb_buffer_serialize_glyphs_text (hb_buffer_t *buffer,
  				  unsigned int start,
  				  unsigned int end,
  				  char *buf,
  				  unsigned int buf_size,
  				  unsigned int *buf_consumed,
  				  hb_font_t *font,
  				  hb_buffer_serialize_flags_t flags)
  {
    hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, NULL);
    hb_glyph_position_t *pos = hb_buffer_get_glyph_positions (buffer, NULL);
    hb_direction_t direction = hb_buffer_get_direction (buffer);
  
    *buf_consumed = 0;
    for (unsigned int i = start; i < end; i++)
    {
      char b[1024];
      char *p = b;
  
      /* In the following code, we know b is large enough that no overflow can happen. */
  
      if (i)
        *p++ = '|';
  
      if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_GLYPH_NAMES))
      {
        hb_font_glyph_to_string (font, info[i].codepoint, p, 128);
        p += strlen (p);
      }
      else
        p += snprintf (p, ARRAY_LENGTH (b) - (p - b), "%u", info[i].codepoint);
  
      if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_CLUSTERS)) {
        p += snprintf (p, ARRAY_LENGTH (b) - (p - b), "=%u", info[i].cluster);
      }
  
      if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS))
      {
        if (pos[i].x_offset || pos[i].y_offset)
  	p += snprintf (p, ARRAY_LENGTH (b) - (p - b), "@%d,%d", pos[i].x_offset, pos[i].y_offset);
  
        *p++ = '+';
        if (HB_DIRECTION_IS_HORIZONTAL (direction) || pos[i].x_advance)
  	p += snprintf (p, ARRAY_LENGTH (b) - (p - b), "%d", pos[i].x_advance);
        if (HB_DIRECTION_IS_VERTICAL (direction) || pos->y_advance)
  	p += snprintf (p, ARRAY_LENGTH (b) - (p - b), ",%d", pos[i].y_advance);
      }
  
      if (buf_size > (p - b))
      {
        unsigned int l = p - b;
        memcpy (buf, b, l);
        buf += l;
        buf_size -= l;
        *buf_consumed += l;
        *buf = '\0';
      } else
        return i - start;
    }
  
    return end - start;
  }
  
  /* Returns number of items, starting at start, that were serialized. */
  unsigned int
  hb_buffer_serialize_glyphs (hb_buffer_t *buffer,
  			    unsigned int start,
  			    unsigned int end,
  			    char *buf,
  			    unsigned int buf_size,
  			    unsigned int *buf_consumed,
  			    hb_font_t *font, /* May be NULL */
  			    hb_buffer_serialize_format_t format,
  			    hb_buffer_serialize_flags_t flags)
  {
    assert (start <= end && end <= buffer->len);
  
    *buf_consumed = 0;
  
    assert ((!buffer->len && buffer->content_type == HB_BUFFER_CONTENT_TYPE_INVALID) ||
  	  buffer->content_type == HB_BUFFER_CONTENT_TYPE_GLYPHS);
  
    if (unlikely (start == end))
      return 0;
  
    if (!font)
      font = hb_font_get_empty ();
  
    switch (format)
    {
      case HB_BUFFER_SERIALIZE_FORMAT_TEXT:
        return _hb_buffer_serialize_glyphs_text (buffer, start, end,
  					       buf, buf_size, buf_consumed,
  					       font, flags);
  
      case HB_BUFFER_SERIALIZE_FORMAT_JSON:
        return _hb_buffer_serialize_glyphs_json (buffer, start, end,
  					       buf, buf_size, buf_consumed,
  					       font, flags);
  
      default:
      case HB_BUFFER_SERIALIZE_FORMAT_INVALID:
        return 0;
  
    }
  }
  
  hb_bool_t
  hb_buffer_deserialize_glyphs (hb_buffer_t *buffer,
  			      const char *buf,
  			      unsigned int buf_len,
  			      unsigned int *buf_consumed,
  			      hb_font_t *font, /* May be NULL */
  			      hb_buffer_serialize_format_t format)
  {
    return false;
  }
  

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