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      1 /*
      2  * Copyright  2011,2012  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 #ifndef HB_SHAPE_CONSUMER_HH
     30 #define HB_SHAPE_CONSUMER_HH
     31 
     32 
     33 template <typename output_t>
     34 struct shape_consumer_t
     35 {
     36   shape_consumer_t (option_parser_t *parser)
     37 		  : shaper (parser),
     38 		    output (parser) {}
     39 
     40   void init (const font_options_t *font_opts)
     41   {
     42     font = hb_font_reference (font_opts->get_font ());
     43     output.init (font_opts);
     44     failed = false;
     45   }
     46   void consume_line (hb_buffer_t  *buffer,
     47 		     const char   *text,
     48 		     unsigned int  text_len,
     49 		     const char   *text_before,
     50 		     const char   *text_after)
     51   {
     52     output.new_line ();
     53 
     54     shaper.populate_buffer (buffer, text, text_len, text_before, text_after);
     55     output.consume_text (buffer, text, text_len, shaper.utf8_clusters);
     56 
     57     if (!shaper.shape (font, buffer)) {
     58       failed = true;
     59       hb_buffer_set_length (buffer, 0);
     60       output.shape_failed (buffer, text, text_len, shaper.utf8_clusters);
     61       return;
     62     }
     63 
     64     output.consume_glyphs (buffer, text, text_len, shaper.utf8_clusters);
     65   }
     66   void finish (const font_options_t *font_opts)
     67   {
     68     output.finish (font_opts);
     69     hb_font_destroy (font);
     70     font = NULL;
     71   }
     72 
     73   public:
     74   bool failed;
     75 
     76   protected:
     77   shape_options_t shaper;
     78   output_t output;
     79 
     80   hb_font_t *font;
     81 };
     82 
     83 
     84 #endif
     85