view-cairo.hh revision 078de49ca10285f6cd1452abd40f831a17af5d1a 
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{
36  view_cairo_t (option_parser_t *parser)
37	       : output_options (parser, helper_cairo_supported_formats),
38		 view_options (parser),
39		 lines (0), scale (1.0) {}
40  ~view_cairo_t (void) {
41    if (debug)
42      cairo_debug_reset_static_data ();
43  }
44
45  void init (const font_options_t *font_opts)
46  {
47    lines = g_array_new (false, false, sizeof (helper_cairo_line_t));
48    scale = double (view_options.font_size) / hb_face_get_upem (hb_font_get_face (font_opts->get_font ()));
49  }
50  void new_line (void)
51  {
52  }
53  void consume_text (hb_buffer_t  *buffer,
54		     const char   *text,
55		     unsigned int  text_len,
56		     hb_bool_t     utf8_clusters)
57  {
58  }
59  void shape_failed (hb_buffer_t  *buffer,
60		     const char   *text,
61		     unsigned int  text_len,
62		     hb_bool_t     utf8_clusters)
63  {
64    fail (false, "all shapers failed");
65  }
66  void consume_glyphs (hb_buffer_t  *buffer,
67		       const char   *text,
68		       unsigned int  text_len,
69		       hb_bool_t     utf8_clusters)
70  {
71    direction = hb_buffer_get_direction (buffer);
72    helper_cairo_line_t l;
73    helper_cairo_line_from_buffer (&l, buffer, text, text_len, scale, utf8_clusters);
74    g_array_append_val (lines, l);
75  }
76  void finish (const font_options_t *font_opts)
77  {
78    render (font_opts);
79
80    for (unsigned int i = 0; i < lines->len; i++) {
81      helper_cairo_line_t &line = g_array_index (lines, helper_cairo_line_t, i);
82      line.finish ();
83    }
84    g_array_free (lines, TRUE);
85  }
86
87  protected:
88
89  output_options_t output_options;
90  view_options_t view_options;
91
92  void render (const font_options_t *font_opts);
93  void get_surface_size (cairo_scaled_font_t *scaled_font, double *w, double *h);
94  void draw (cairo_t *cr);
95
96  hb_direction_t direction; // Remove this, make segment_properties accessible
97  GArray *lines;
98  double scale;
99};
100
101#endif
102