102 lines
2.7 KiB
C++
102 lines
2.7 KiB
C++
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/*
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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.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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