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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 #ifndef HELPER_CAIRO_HH
28 #define HELPER_CAIRO_HH
29 
30 #include "hb.hh"
31 #include "options.hh"
32 
33 #include <cairo.h>
34 
35 
36 cairo_scaled_font_t *
37 helper_cairo_create_scaled_font (const font_options_t *font_opts);
38 
39 bool
40 helper_cairo_scaled_font_has_color (cairo_scaled_font_t *scaled_font);
41 
42 extern const char *helper_cairo_supported_formats[];
43 
44 cairo_t *
45 helper_cairo_create_context (double w, double h,
46 			     view_options_t *view_opts,
47 			     output_options_t *out_opts,
48 			     cairo_content_t content);
49 
50 void
51 helper_cairo_destroy_context (cairo_t *cr);
52 
53 
54 struct helper_cairo_line_t {
55   cairo_glyph_t *glyphs;
56   unsigned int num_glyphs;
57   char *utf8;
58   unsigned int utf8_len;
59   cairo_text_cluster_t *clusters;
60   unsigned int num_clusters;
61   cairo_text_cluster_flags_t cluster_flags;
62 
finishhelper_cairo_line_t63   void finish () {
64     if (glyphs)
65       cairo_glyph_free (glyphs);
66     if (clusters)
67       cairo_text_cluster_free (clusters);
68     if (utf8)
69       g_free (utf8);
70   }
71 
get_advancehelper_cairo_line_t72   void get_advance (double *x_advance, double *y_advance) {
73     *x_advance = glyphs[num_glyphs].x;
74     *y_advance = glyphs[num_glyphs].y;
75   }
76 };
77 
78 void
79 helper_cairo_line_from_buffer (helper_cairo_line_t *l,
80 			       hb_buffer_t         *buffer,
81 			       const char          *text,
82 			       unsigned int         text_len,
83 			       int                  scale_bits,
84 			       hb_bool_t            utf8_clusters);
85 
86 #endif
87