harfbuzz/util/hb-subset.cc

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/*
* Copyright © 2010 Behdad Esfahbod
* 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): Garret Rieger, Rod Sheeter
*/
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#include <stdio.h>
#include "subset-options.hh"
#include "output-options.hh"
#include "face-options.hh"
#include "text-options.hh"
#include "batch.hh"
#include "main-font-text.hh"
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/*
* Command line interface to the harfbuzz font subsetter.
*/
struct subset_consumer_t : subset_options_t, output_options_t
{
void add_options (option_parser_t *parser)
{
subset_options_t::add_options (parser);
output_options_t::add_options (parser);
}
void init (const face_options_t *face_opts)
{
face = hb_face_reference (face_opts->get_face ());
input = hb_subset_input_reference (get_input ());
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}
void consume_line (const char *text,
unsigned int text_len,
const char *text_before,
const char *text_after)
{
// TODO does this only get called with at least 1 codepoint?
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hb_set_t *codepoints = hb_subset_input_unicode_set (input);
if (0 == strcmp (text, "*"))
{
hb_face_collect_unicodes (face, codepoints);
return;
}
gchar *c = (gchar *)text;
do {
gunichar cp = g_utf8_get_char(c);
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hb_codepoint_t hb_cp = cp;
hb_set_add (codepoints, hb_cp);
} while ((c = g_utf8_find_next_char(c, text + text_len)));
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}
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hb_bool_t
write_file (const char *output_file, hb_blob_t *blob) {
unsigned int size;
const char* data = hb_blob_get_data (blob, &size);
if (!output_file)
fail (true, "No output file was specified");
FILE *fp = fopen(output_file, "wb");
if (!fp)
fail (false, "Cannot open output file `%s': %s",
g_filename_display_name (output_file), strerror (errno));
while (size) {
size_t ret = fwrite (data, 1, size, fp);
size -= ret;
data += ret;
if (size && ferror (fp))
fail (false, "Failed to write output: %s", strerror (errno));
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}
fclose (fp);
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return true;
}
void finish (const face_options_t *face_opts)
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{
hb_face_t *new_face = nullptr;
for (unsigned i = 0; i < num_iterations; i++)
{
hb_face_destroy (new_face);
new_face = hb_subset_or_fail (face, input);
}
failed = !new_face;
if (!failed)
{
hb_blob_t *result = hb_face_reference_blob (new_face);
write_file (output_file, result);
hb_blob_destroy (result);
}
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hb_subset_input_destroy (input);
hb_face_destroy (new_face);
hb_face_destroy (face);
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}
public:
bool failed = false;
hb_face_t *face = nullptr;
hb_subset_input_t *input = nullptr;
};
int
main (int argc, char **argv)
{
auto main_func = main_font_text<subset_consumer_t, face_options_t, text_options_t>;
return batch_main<true> (main_func, argc, argv);
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}