harfbuzz/util/hb-subset.cc
2021-05-26 15:20:44 -06:00

134 lines
3.8 KiB
C++

/*
* 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
*/
#include <stdio.h>
#include "main-font-text.hh"
#include "hb-subset.h"
/*
* Command line interface to the harfbuzz font subsetter.
*/
struct subset_consumer_t
{
subset_consumer_t (option_parser_t *parser)
: failed (false), options (parser), subset_options (parser), font (nullptr), input (nullptr) {}
void init (hb_buffer_t *buffer_,
const font_options_t *font_opts)
{
font = hb_font_reference (font_opts->get_font ());
input = hb_subset_input_reference (subset_options.input);
}
void consume_line (const char *text,
unsigned int text_len,
const char *text_before,
const char *text_after)
{
// TODO(Q1) does this only get called with at least 1 codepoint?
hb_set_t *codepoints = hb_subset_input_unicode_set (input);
if (0 == strcmp (text, "*"))
{
hb_face_t *face = hb_font_get_face (font);
hb_face_collect_unicodes (face, codepoints);
return;
}
gchar *c = (gchar *)text;
do {
gunichar cp = g_utf8_get_char(c);
hb_codepoint_t hb_cp = cp;
hb_set_add (codepoints, hb_cp);
} while ((c = g_utf8_find_next_char(c, text + text_len)));
}
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));
}
fclose (fp);
return true;
}
void finish (const font_options_t *font_opts)
{
hb_face_t *face = hb_font_get_face (font);
hb_face_t *new_face = nullptr;
for (unsigned i = 0; i < subset_options.num_iterations; i++) {
hb_face_destroy (new_face);
new_face = hb_subset (face, input);
}
hb_blob_t *result = hb_face_reference_blob (new_face);
failed = !hb_blob_get_length (result);
if (!failed)
write_file (options.output_file, result);
hb_subset_input_destroy (input);
hb_blob_destroy (result);
hb_face_destroy (new_face);
hb_font_destroy (font);
}
public:
bool failed;
private:
output_options_t options;
subset_options_t subset_options;
hb_font_t *font;
hb_subset_input_t *input;
};
int
main (int argc, char **argv)
{
main_font_text_t<subset_consumer_t, 10, 0> driver;
return driver.main (argc, argv);
}