view-cairo.hh revision 0594a2448440208efa0acac9a5d8d52d43108289 
1/*
2 * Copyright © 2011  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#include "helper-cairo.hh"
29
30#ifndef VIEW_CAIRO_HH
31#define VIEW_CAIRO_HH
32
33
34struct view_cairo_t {
35  view_cairo_t (option_parser_t *parser)
36	       : output_options (parser),
37	         view_options (parser) {}
38  ~view_cairo_t (void) {
39    if (debug)
40      cairo_debug_reset_static_data ();
41  }
42
43  void init (const font_options_t *font_opts)
44  {
45    lines = g_array_new (false, false, sizeof (helper_cairo_line_t));
46    scale = double (view_options.font_size) / hb_face_get_upem (hb_font_get_face (font_opts->get_font ()));
47  }
48  void new_line (void)
49  {
50  }
51  void consume_text (hb_buffer_t  *buffer,
52		     const char   *text,
53		     unsigned int  text_len,
54		     hb_bool_t     utf8_clusters)
55  {
56  }
57  void shape_failed (hb_buffer_t  *buffer,
58		     const char   *text,
59		     unsigned int  text_len,
60		     hb_bool_t     utf8_clusters)
61  {
62    fail (false, "all shapers failed");
63  }
64  void consume_glyphs (hb_buffer_t  *buffer,
65		       const char   *text,
66		       unsigned int  text_len,
67		       hb_bool_t     utf8_clusters)
68  {
69    direction = hb_buffer_get_direction (buffer);
70    helper_cairo_line_t l;
71    helper_cairo_line_from_buffer (&l, buffer, text, text_len, scale, utf8_clusters);
72    g_array_append_val (lines, l);
73  }
74  void finish (const font_options_t *font_opts)
75  {
76    render (font_opts);
77
78    for (unsigned int i = 0; i < lines->len; i++) {
79      helper_cairo_line_t &line = g_array_index (lines, helper_cairo_line_t, i);
80      line.finish ();
81    }
82    g_array_unref (lines);
83  }
84
85  protected:
86
87  output_options_t output_options;
88  view_options_t view_options;
89
90  void render (const font_options_t *font_opts);
91  void get_surface_size (cairo_scaled_font_t *scaled_font, double *w, double *h);
92  void draw (cairo_t *cr);
93
94  hb_direction_t direction; // Remove this, make segment_properties accessible
95  GArray *lines;
96  double scale;
97};
98
99#endif
100