HarfBuzz text shaping engine
http://harfbuzz.github.io/
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101 lines
2.7 KiB
101 lines
2.7 KiB
/* |
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* Copyright © 2011,2012 Google, Inc. |
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* |
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* This is part of HarfBuzz, a text shaping library. |
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* |
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* Permission is hereby granted, without written agreement and without |
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* license or royalty fees, to use, copy, modify, and distribute this |
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* software and its documentation for any purpose, provided that the |
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* above copyright notice and the following two paragraphs appear in |
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* all copies of this software. |
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* |
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
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* DAMAGE. |
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* |
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
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* |
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* Google Author(s): Behdad Esfahbod |
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*/ |
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#ifndef HB_SHAPE_CONSUMER_HH |
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#define HB_SHAPE_CONSUMER_HH |
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#include "hb-private.hh" |
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#include "options.hh" |
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template <typename output_t> |
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struct shape_consumer_t |
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{ |
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shape_consumer_t (option_parser_t *parser) |
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: failed (false), |
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shaper (parser), |
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output (parser), |
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font (nullptr), |
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buffer (nullptr) {} |
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void init (hb_buffer_t *buffer_, |
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const font_options_t *font_opts) |
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{ |
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font = hb_font_reference (font_opts->get_font ()); |
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failed = false; |
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buffer = hb_buffer_reference (buffer_); |
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output.init (buffer, font_opts); |
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} |
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void consume_line (const char *text, |
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unsigned int text_len, |
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const char *text_before, |
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const char *text_after) |
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{ |
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output.new_line (); |
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for (unsigned int n = shaper.num_iterations; n; n--) |
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{ |
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const char *error = nullptr; |
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shaper.populate_buffer (buffer, text, text_len, text_before, text_after); |
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if (n == 1) |
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output.consume_text (buffer, text, text_len, shaper.utf8_clusters); |
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if (!shaper.shape (font, buffer, &error)) |
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{ |
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failed = true; |
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output.error (error); |
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if (hb_buffer_get_content_type (buffer) == HB_BUFFER_CONTENT_TYPE_GLYPHS) |
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break; |
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else |
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return; |
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} |
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} |
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output.consume_glyphs (buffer, text, text_len, shaper.utf8_clusters); |
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} |
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void finish (const font_options_t *font_opts) |
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{ |
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output.finish (buffer, font_opts); |
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hb_font_destroy (font); |
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font = nullptr; |
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hb_buffer_destroy (buffer); |
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buffer = nullptr; |
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} |
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public: |
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bool failed; |
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protected: |
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shape_options_t shaper; |
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output_t output; |
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hb_font_t *font; |
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hb_buffer_t *buffer; |
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}; |
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#endif
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