helper-cairo.hh revision 95cefdf96efe43a44133aa8a186155cf4e63e2b7 
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
29#include <cairo.h>
30
31#ifndef HELPER_CAIRO_HH
32#define HELPER_CAIRO_HH
33
34
35cairo_scaled_font_t *
36helper_cairo_create_scaled_font (const font_options_t *font_opts,
37				 double font_size);
38
39
40cairo_t *
41helper_cairo_create_context (double w, double h,
42			     view_options_t *view_opts,
43			     output_options_t *out_opts);
44
45void
46helper_cairo_destroy_context (cairo_t *cr);
47
48
49struct helper_cairo_line_t {
50  cairo_glyph_t *glyphs;
51  unsigned int num_glyphs;
52  char *utf8;
53  unsigned int utf8_len;
54  cairo_text_cluster_t *clusters;
55  unsigned int num_clusters;
56  cairo_text_cluster_flags_t cluster_flags;
57
58  void finish (void) {
59    if (glyphs)
60      cairo_glyph_free (glyphs);
61    if (clusters)
62      cairo_text_cluster_free (clusters);
63    if (utf8)
64      g_free (utf8);
65  }
66
67  void get_advance (double *x_advance, double *y_advance) {
68    *x_advance = glyphs[num_glyphs].x;
69    *y_advance = glyphs[num_glyphs].y;
70  }
71};
72
73void
74helper_cairo_line_from_buffer (helper_cairo_line_t *l,
75			       hb_buffer_t         *buffer,
76			       const char          *text,
77			       unsigned int         text_len,
78			       double               scale,
79			       hb_bool_t            utf8_clusters);
80
81#endif
82