1/*
2 * Copyright © 2011,2012  Google, Inc.
3 *
4 *  This is part of HarfBuzz, a text shaping library.
5 *
6 * Permission is hereby granted, without written agreement and without
7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
11 *
12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
16 * DAMAGE.
17 *
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
23 *
24 * Google Author(s): Behdad Esfahbod
25 */
26
27#include "options.hh"
28
29#ifndef HB_SHAPE_CONSUMER_HH
30#define HB_SHAPE_CONSUMER_HH
31
32
33template <typename output_t>
34struct shape_consumer_t
35{
36  shape_consumer_t (option_parser_t *parser)
37		  : failed (false),
38		    shaper (parser),
39		    output (parser),
40		    font (NULL) {}
41
42  void init (const font_options_t *font_opts)
43  {
44    font = hb_font_reference (font_opts->get_font ());
45    output.init (font_opts);
46    failed = false;
47  }
48  void consume_line (hb_buffer_t  *buffer,
49		     const char   *text,
50		     unsigned int  text_len,
51		     const char   *text_before,
52		     const char   *text_after)
53  {
54    output.new_line ();
55
56    for (unsigned int n = shaper.num_iterations; n; n--)
57    {
58      shaper.populate_buffer (buffer, text, text_len, text_before, text_after);
59      if (n == 1)
60	output.consume_text (buffer, text, text_len, shaper.utf8_clusters);
61      if (!shaper.shape (font, buffer)) {
62	failed = true;
63	hb_buffer_set_length (buffer, 0);
64	output.shape_failed (buffer, text, text_len, shaper.utf8_clusters);
65	return;
66      }
67    }
68
69    output.consume_glyphs (buffer, text, text_len, shaper.utf8_clusters);
70  }
71  void finish (const font_options_t *font_opts)
72  {
73    output.finish (font_opts);
74    hb_font_destroy (font);
75    font = NULL;
76  }
77
78  public:
79  bool failed;
80
81  protected:
82  shape_options_t shaper;
83  output_t output;
84
85  hb_font_t *font;
86};
87
88
89#endif
90