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 #ifndef HB_SHAPE_CONSUMER_HH 28 #define HB_SHAPE_CONSUMER_HH 29 30 #include "hb.hh" 31 #include "options.hh" 32 33 34 template <typename output_t> 35 struct shape_consumer_t 36 { shape_consumer_tshape_consumer_t37 shape_consumer_t (option_parser_t *parser) 38 : failed (false), 39 shaper (parser), 40 output (parser), 41 font (nullptr), 42 buffer (nullptr) {} 43 initshape_consumer_t44 void init (hb_buffer_t *buffer_, 45 const font_options_t *font_opts) 46 { 47 font = hb_font_reference (font_opts->get_font ()); 48 failed = false; 49 buffer = hb_buffer_reference (buffer_); 50 51 output.init (buffer, font_opts); 52 } consume_lineshape_consumer_t53 void consume_line (const char *text, 54 unsigned int text_len, 55 const char *text_before, 56 const char *text_after) 57 { 58 output.new_line (); 59 60 for (unsigned int n = shaper.num_iterations; n; n--) 61 { 62 const char *error = nullptr; 63 64 shaper.populate_buffer (buffer, text, text_len, text_before, text_after); 65 if (n == 1) 66 output.consume_text (buffer, text, text_len, shaper.utf8_clusters); 67 if (!shaper.shape (font, buffer, &error)) 68 { 69 failed = true; 70 output.error (error); 71 if (hb_buffer_get_content_type (buffer) == HB_BUFFER_CONTENT_TYPE_GLYPHS) 72 break; 73 else 74 return; 75 } 76 } 77 78 output.consume_glyphs (buffer, text, text_len, shaper.utf8_clusters); 79 } finishshape_consumer_t80 void finish (const font_options_t *font_opts) 81 { 82 output.finish (buffer, font_opts); 83 hb_font_destroy (font); 84 font = nullptr; 85 hb_buffer_destroy (buffer); 86 buffer = nullptr; 87 } 88 89 public: 90 bool failed; 91 92 protected: 93 shape_options_t shaper; 94 output_t output; 95 96 hb_font_t *font; 97 hb_buffer_t *buffer; 98 }; 99 100 101 #endif 102