kc3-lang/harfbuzz/util/face-options.hh

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• Hash : 11b0b688
  Author :
  Date : 2021-08-12T11:38:28
  

  [util/hb-subset] Pre-parse font-face so we can use it during main parsing
  

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• util/face-options.hh

• /*
   * Copyright © 2011  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 FACE_OPTIONS_HH
  #define FACE_OPTIONS_HH
  
  #include "options.hh"
  
  struct face_options_t
  {
    ~face_options_t ()
    {
      g_free (font_file);
    }
  
    void set_face (hb_face_t *face_)
    { face = face_; }
  
    void add_options (option_parser_t *parser);
  
    void post_parse (GError **error);
  
    static struct cache_t
    {
      ~cache_t ()
      {
        g_free (font_path);
        hb_blob_destroy (blob);
        hb_face_destroy (face);
      }
  
      char *font_path = nullptr;
      hb_blob_t *blob = nullptr;
      unsigned face_index = (unsigned) -1;
      hb_face_t *face = nullptr;
    } cache;
  
    char *font_file = nullptr;
    unsigned face_index = 0;
  
    hb_blob_t *blob = nullptr;
    hb_face_t *face = nullptr;
  };
  
  
  face_options_t::cache_t face_options_t::cache {};
  
  void
  face_options_t::post_parse (GError **error)
  {
    if (!font_file)
    {
      g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_FAILED,
  		 "No font file set");
      return;
    }
  
    assert (font_file);
  
    const char *font_path = font_file;
  
    if (0 == strcmp (font_path, "-"))
    {
  #if defined(_WIN32) || defined(__CYGWIN__)
      setmode (fileno (stdin), O_BINARY);
      font_path = "STDIN";
  #else
      font_path = "/dev/stdin";
  #endif
    }
  
    if (!cache.font_path || 0 != strcmp (cache.font_path, font_path))
    {
      hb_blob_destroy (cache.blob);
      cache.blob = hb_blob_create_from_file_or_fail (font_path);
  
      free ((char *) cache.font_path);
      cache.font_path = g_strdup (font_path);
  
      if (!cache.blob)
      {
        g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_FAILED,
  		   "%s: Failed reading file", font_path);
        return;
      }
  
      hb_face_destroy (cache.face);
      cache.face = nullptr;
      cache.face_index = (unsigned) -1;
    }
  
    if (cache.face_index != face_index)
    {
      hb_face_destroy (cache.face);
      cache.face = hb_face_create (cache.blob, face_index);
      cache.face_index = face_index;
    }
  
    blob = cache.blob;
    face = cache.face;
  }
  
  void
  face_options_t::add_options (option_parser_t *parser)
  {
    GOptionEntry entries[] =
    {
      {"font-file",	0, 0, G_OPTION_ARG_STRING,	&this->font_file,		"Set font file-name",				"filename"},
      {"face-index",	0, 0, G_OPTION_ARG_INT,		&this->face_index,		"Set face index (default: 0)",			"index"},
      {nullptr}
    };
    parser->add_group (entries,
  		     "face",
  		     "Font-face options:",
  		     "Options for the font face",
  		     this);
  }
  
  #endif
  

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