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 VIEW_CAIRO_HH
28 #define VIEW_CAIRO_HH
29 
30 #include "hb-private.hh"
31 #include "options.hh"
32 #include "helper-cairo.hh"
33 
34 
35 struct view_cairo_t
36 {
view_cairo_tview_cairo_t37   view_cairo_t (option_parser_t *parser)
38 	       : output_options (parser, helper_cairo_supported_formats),
39 		 view_options (parser),
40 		 direction (HB_DIRECTION_INVALID),
41 		 lines (0), scale_bits (0) {}
~view_cairo_tview_cairo_t42   ~view_cairo_t (void) {
43     if (debug)
44       cairo_debug_reset_static_data ();
45   }
46 
initview_cairo_t47   void init (hb_buffer_t *buffer, const font_options_t *font_opts)
48   {
49     lines = g_array_new (false, false, sizeof (helper_cairo_line_t));
50     scale_bits = -font_opts->subpixel_bits;
51   }
new_lineview_cairo_t52   void new_line (void)
53   {
54   }
consume_textview_cairo_t55   void consume_text (hb_buffer_t  *buffer,
56 		     const char   *text,
57 		     unsigned int  text_len,
58 		     hb_bool_t     utf8_clusters)
59   {
60   }
errorview_cairo_t61   void error (const char *message)
62   {
63     g_printerr ("%s: %s\n", g_get_prgname (), message);
64   }
consume_glyphsview_cairo_t65   void consume_glyphs (hb_buffer_t  *buffer,
66 		       const char   *text,
67 		       unsigned int  text_len,
68 		       hb_bool_t     utf8_clusters)
69   {
70     direction = hb_buffer_get_direction (buffer);
71     helper_cairo_line_t l;
72     helper_cairo_line_from_buffer (&l, buffer, text, text_len, scale_bits, utf8_clusters);
73     g_array_append_val (lines, l);
74   }
finishview_cairo_t75   void finish (hb_buffer_t *buffer, const font_options_t *font_opts)
76   {
77     render (font_opts);
78 
79     for (unsigned int i = 0; i < lines->len; i++) {
80       helper_cairo_line_t &line = g_array_index (lines, helper_cairo_line_t, i);
81       line.finish ();
82     }
83 #if GLIB_CHECK_VERSION (2, 22, 0)
84     g_array_unref (lines);
85 #else
86     g_array_free (lines, TRUE);
87 #endif
88   }
89 
90   protected:
91 
92   output_options_t output_options;
93   view_options_t view_options;
94 
95   void render (const font_options_t *font_opts);
96 
97   hb_direction_t direction; // Remove this, make segment_properties accessible
98   GArray *lines;
99   int scale_bits;
100 };
101 
102 #endif
103