harfbuzz/util/face-options.hh

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/*
* Copyright © 2011 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 FACE_OPTIONS_HH
#define FACE_OPTIONS_HH
#include "options.hh"
struct face_options_t
{
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~face_options_t ()
{
g_free (font_file);
}
void set_face (hb_face_t *face_)
{ face = face_; }
void add_options (option_parser_t *parser);
void post_parse (GError **error);
static struct cache_t
{
~cache_t ()
{
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g_free (font_path);
hb_blob_destroy (blob);
hb_face_destroy (face);
}
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char *font_path = nullptr;
hb_blob_t *blob = nullptr;
unsigned face_index = (unsigned) -1;
hb_face_t *face = nullptr;
} cache;
char *font_file = nullptr;
unsigned face_index = 0;
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hb_bool_t list_tables = false;
hb_blob_t *blob = nullptr;
hb_face_t *face = nullptr;
};
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static G_GNUC_NORETURN void _list_tables (hb_face_t *face);
face_options_t::cache_t face_options_t::cache {};
void
face_options_t::post_parse (GError **error)
{
if (!font_file)
{
g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_FAILED,
"No font file set");
return;
}
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assert (font_file);
const char *font_path = font_file;
if (0 == strcmp (font_path, "-"))
{
#if defined(_WIN32) || defined(__CYGWIN__)
setmode (fileno (stdin), O_BINARY);
font_path = "STDIN";
#else
font_path = "/dev/stdin";
#endif
}
if (!cache.font_path || 0 != strcmp (cache.font_path, font_path))
{
hb_blob_destroy (cache.blob);
cache.blob = hb_blob_create_from_file_or_fail (font_path);
free ((char *) cache.font_path);
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cache.font_path = g_strdup (font_path);
if (!cache.blob)
{
g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_FAILED,
"%s: Failed reading file", font_path);
return;
}
hb_face_destroy (cache.face);
cache.face = nullptr;
cache.face_index = (unsigned) -1;
}
if (cache.face_index != face_index)
{
hb_face_destroy (cache.face);
cache.face = hb_face_create (cache.blob, face_index);
cache.face_index = face_index;
}
blob = cache.blob;
face = cache.face;
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if (list_tables)
_list_tables (face);
}
static G_GNUC_NORETURN void _list_tables (hb_face_t *face)
{
unsigned count = hb_face_get_table_tags (face, 0, nullptr, nullptr);
hb_tag_t *tags = (hb_tag_t *) calloc (count, sizeof (hb_tag_t));
hb_face_get_table_tags (face, 0, &count, tags);
for (unsigned i = 0; i < count; i++)
{
hb_tag_t tag = tags[i];
hb_blob_t *blob = hb_face_reference_table (face, tag);
printf ("%c%c%c%c: %8u bytes\n", HB_UNTAG (tag), hb_blob_get_length (blob));
hb_blob_destroy (blob);
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}
free (tags);
exit (0);
}
void
face_options_t::add_options (option_parser_t *parser)
{
GOptionEntry entries[] =
{
{"font-file", 0, 0, G_OPTION_ARG_STRING, &this->font_file, "Set font file-name", "filename"},
{"face-index", 0, 0, G_OPTION_ARG_INT, &this->face_index, "Set face index (default: 0)", "index"},
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{"list-tables", 0, 0, G_OPTION_ARG_NONE, &this->list_tables, "List font tables and quit", nullptr},
{nullptr}
};
parser->add_group (entries,
"face",
"Font-face options:",
"Options for the font face",
this);
}
#endif