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#ifndef HB_SHAPE_CONSUMER_HH
28#define HB_SHAPE_CONSUMER_HH
29
30#include "hb-private.hh"
31#include "options.hh"
32
33
34template <typename output_t>
35struct shape_consumer_t
36{
37  shape_consumer_t (option_parser_t *parser)
38		  : failed (false),
39		    shaper (parser),
40		    output (parser),
41		    font (nullptr),
42		    buffer (nullptr) {}
43
44  void init (hb_buffer_t  *buffer_,
45	     const font_options_t *font_opts)
46  {
47    font = hb_font_reference (font_opts->get_font ());
48    failed = false;
49    buffer = hb_buffer_reference (buffer_);
50
51    output.init (buffer, font_opts);
52  }
53  void consume_line (const char   *text,
54		     unsigned int  text_len,
55		     const char   *text_before,
56		     const char   *text_after)
57  {
58    output.new_line ();
59
60    for (unsigned int n = shaper.num_iterations; n; n--)
61    {
62      const char *error = nullptr;
63
64      shaper.populate_buffer (buffer, text, text_len, text_before, text_after);
65      if (n == 1)
66	output.consume_text (buffer, text, text_len, shaper.utf8_clusters);
67      if (!shaper.shape (font, buffer, &error))
68      {
69	failed = true;
70	output.error (error);
71	if (hb_buffer_get_content_type (buffer) == HB_BUFFER_CONTENT_TYPE_GLYPHS)
72	  break;
73	else
74	  return;
75      }
76    }
77
78    output.consume_glyphs (buffer, text, text_len, shaper.utf8_clusters);
79  }
80  void finish (const font_options_t *font_opts)
81  {
82    output.finish (buffer, font_opts);
83    hb_font_destroy (font);
84    font = nullptr;
85    hb_buffer_destroy (buffer);
86    buffer = nullptr;
87  }
88
89  public:
90  bool failed;
91
92  protected:
93  shape_options_t shaper;
94  output_t output;
95
96  hb_font_t *font;
97  hb_buffer_t *buffer;
98};
99
100
101#endif
102