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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 #include "options.hh"
     28 #include "helper-cairo.hh"
     29 
     30 #ifndef VIEW_CAIRO_HH
     31 #define VIEW_CAIRO_HH
     32 
     33 
     34 struct 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 		 direction (HB_DIRECTION_INVALID),
     40 		 lines (0), scale_bits (0) {}
     41   ~view_cairo_t (void) {
     42     if (debug)
     43       cairo_debug_reset_static_data ();
     44   }
     45 
     46   void init (const font_options_t *font_opts)
     47   {
     48     lines = g_array_new (false, false, sizeof (helper_cairo_line_t));
     49     scale_bits = -font_opts->subpixel_bits;
     50   }
     51   void new_line (void)
     52   {
     53   }
     54   void consume_text (hb_buffer_t  *buffer,
     55 		     const char   *text,
     56 		     unsigned int  text_len,
     57 		     hb_bool_t     utf8_clusters)
     58   {
     59   }
     60   void shape_failed (hb_buffer_t  *buffer,
     61 		     const char   *text,
     62 		     unsigned int  text_len,
     63 		     hb_bool_t     utf8_clusters)
     64   {
     65     fail (false, "all shapers failed");
     66   }
     67   void consume_glyphs (hb_buffer_t  *buffer,
     68 		       const char   *text,
     69 		       unsigned int  text_len,
     70 		       hb_bool_t     utf8_clusters)
     71   {
     72     direction = hb_buffer_get_direction (buffer);
     73     helper_cairo_line_t l;
     74     helper_cairo_line_from_buffer (&l, buffer, text, text_len, scale_bits, utf8_clusters);
     75     g_array_append_val (lines, l);
     76   }
     77   void finish (const font_options_t *font_opts)
     78   {
     79     render (font_opts);
     80 
     81     for (unsigned int i = 0; i < lines->len; i++) {
     82       helper_cairo_line_t &line = g_array_index (lines, helper_cairo_line_t, i);
     83       line.finish ();
     84     }
     85 #if GLIB_CHECK_VERSION (2, 22, 0)
     86     g_array_unref (lines);
     87 #else
     88     g_array_free (lines, TRUE);
     89 #endif
     90   }
     91 
     92   protected:
     93 
     94   output_options_t output_options;
     95   view_options_t view_options;
     96 
     97   void render (const font_options_t *font_opts);
     98 
     99   hb_direction_t direction; // Remove this, make segment_properties accessible
    100   GArray *lines;
    101   int scale_bits;
    102 };
    103 
    104 #endif
    105