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