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HarfBuzz text shaping engine http://harfbuzz.github.io/
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harfbuzz/util/options.cc

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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
*/
#include "options.hh"
#ifdef HAVE_FREETYPE
#include <hb-ft.h>
#endif
void
fail (hb_bool_t suggest_help, const char *format, ...)
{
const char *msg;
va_list vap;
va_start (vap, format);
msg = g_strdup_vprintf (format, vap);
const char *prgname = g_get_prgname ();
g_printerr ("%s: %s\n", prgname, msg);
if (suggest_help)
g_printerr ("Try `%s --help' for more information.\n", prgname);
exit (1);
}
hb_bool_t debug = false;
static gchar *
shapers_to_string (void)
{
GString *shapers = g_string_new (NULL);
const char **shaper_list = hb_shape_list_shapers ();
for (; *shaper_list; shaper_list++) {
g_string_append (shapers, *shaper_list);
g_string_append_c (shapers, ',');
}
g_string_truncate (shapers, MAX (0, (gint)shapers->len - 1));
return g_string_free (shapers, false);
}
static G_GNUC_NORETURN gboolean
show_version (const char *name G_GNUC_UNUSED,
const char *arg G_GNUC_UNUSED,
gpointer data G_GNUC_UNUSED,
GError **error G_GNUC_UNUSED)
{
g_printf ("%s (%s) %s\n", g_get_prgname (), PACKAGE_NAME, PACKAGE_VERSION);
char *shapers = shapers_to_string ();
g_printf ("Available shapers: %s\n", shapers);
g_free (shapers);
if (strcmp (HB_VERSION_STRING, hb_version_string ()))
g_printf ("Linked HarfBuzz library has a different version: %s\n", hb_version_string ());
exit(0);
}
void
option_parser_t::add_main_options (void)
{
GOptionEntry entries[] =
{
{"version", 0, G_OPTION_FLAG_NO_ARG,
G_OPTION_ARG_CALLBACK, (gpointer) &show_version, "Show version numbers", NULL},
{"debug", 0, 0, G_OPTION_ARG_NONE, &debug, "Free all resources before exit", NULL},
{NULL}
};
g_option_context_add_main_entries (context, entries, NULL);
}
static gboolean
pre_parse (GOptionContext *context G_GNUC_UNUSED,
GOptionGroup *group G_GNUC_UNUSED,
gpointer data,
GError **error)
{
option_group_t *option_group = (option_group_t *) data;
option_group->pre_parse (error);
return *error == NULL;
}
static gboolean
post_parse (GOptionContext *context G_GNUC_UNUSED,
GOptionGroup *group G_GNUC_UNUSED,
gpointer data,
GError **error)
{
option_group_t *option_group = static_cast<option_group_t *>(data);
option_group->post_parse (error);
return *error == NULL;
}
void
option_parser_t::add_group (GOptionEntry *entries,
const gchar *name,
const gchar *description,
const gchar *help_description,
option_group_t *option_group)
{
GOptionGroup *group = g_option_group_new (name, description, help_description,
static_cast<gpointer>(option_group), NULL);
g_option_group_add_entries (group, entries);
g_option_group_set_parse_hooks (group, pre_parse, post_parse);
g_option_context_add_group (context, group);
}
void
option_parser_t::parse (int *argc, char ***argv)
{
setlocale (LC_ALL, "");
GError *parse_error = NULL;
if (!g_option_context_parse (context, argc, argv, &parse_error))
{
if (parse_error != NULL) {
fail (true, "%s", parse_error->message);
//g_error_free (parse_error);
} else
fail (true, "Option parse error");
}
}
static gboolean
parse_margin (const char *name G_GNUC_UNUSED,
const char *arg,
gpointer data,
GError **error G_GNUC_UNUSED)
{
view_options_t *view_opts = (view_options_t *) data;
view_options_t::margin_t &m = view_opts->margin;
switch (sscanf (arg, "%lf %lf %lf %lf", &m.t, &m.r, &m.b, &m.l)) {
case 1: m.r = m.t;
case 2: m.b = m.t;
case 3: m.l = m.r;
case 4: return true;
default:
g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE,
"%s argument should be one to four space-separated numbers",
name);
return false;
}
}
static gboolean
parse_shapers (const char *name G_GNUC_UNUSED,
const char *arg,
gpointer data,
GError **error G_GNUC_UNUSED)
{
shape_options_t *shape_opts = (shape_options_t *) data;
g_free (shape_opts->shapers);
shape_opts->shapers = g_strsplit (arg, ",", 0);
return true;
}
static G_GNUC_NORETURN gboolean
list_shapers (const char *name G_GNUC_UNUSED,
const char *arg G_GNUC_UNUSED,
gpointer data G_GNUC_UNUSED,
GError **error G_GNUC_UNUSED)
{
for (const char **shaper = hb_shape_list_shapers (); *shaper; shaper++)
g_printf ("%s\n", *shaper);
exit(0);
}
static void
parse_space (char **pp)
{
char c;
#define ISSPACE(c) ((c)==' '||(c)=='\f'||(c)=='\n'||(c)=='\r'||(c)=='\t'||(c)=='\v')
while (c = **pp, ISSPACE (c))
(*pp)++;
#undef ISSPACE
}
static hb_bool_t
parse_char (char **pp, char c)
{
parse_space (pp);
if (**pp != c)
return false;
(*pp)++;
return true;
}
static hb_bool_t
parse_uint (char **pp, unsigned int *pv)
{
char *p = *pp;
unsigned int v;
v = strtol (p, pp, 0);
if (p == *pp)
return false;
*pv = v;
return true;
}
static hb_bool_t
parse_feature_value_prefix (char **pp, hb_feature_t *feature)
{
if (parse_char (pp, '-'))
feature->value = 0;
else {
parse_char (pp, '+');
feature->value = 1;
}
return true;
}
static hb_bool_t
parse_feature_tag (char **pp, hb_feature_t *feature)
{
char *p = *pp, c;
parse_space (pp);
#define ISALNUM(c) (('a' <= (c) && (c) <= 'z') || ('A' <= (c) && (c) <= 'Z') || ('0' <= (c) && (c) <= '9'))
while (c = **pp, ISALNUM(c))
(*pp)++;
#undef ISALNUM
if (p == *pp)
return false;
feature->tag = hb_tag_from_string (p, *pp - p);
return true;
}
static hb_bool_t
parse_feature_indices (char **pp, hb_feature_t *feature)
{
parse_space (pp);
hb_bool_t has_start;
feature->start = 0;
feature->end = (unsigned int) -1;
if (!parse_char (pp, '['))
return true;
has_start = parse_uint (pp, &feature->start);
if (parse_char (pp, ':')) {
parse_uint (pp, &feature->end);
} else {
if (has_start)
feature->end = feature->start + 1;
}
return parse_char (pp, ']');
}
static hb_bool_t
parse_feature_value_postfix (char **pp, hb_feature_t *feature)
{
return !parse_char (pp, '=') || parse_uint (pp, &feature->value);
}
static hb_bool_t
parse_one_feature (char **pp, hb_feature_t *feature)
{
return parse_feature_value_prefix (pp, feature) &&
parse_feature_tag (pp, feature) &&
parse_feature_indices (pp, feature) &&
parse_feature_value_postfix (pp, feature) &&
(parse_char (pp, ',') || **pp == '\0');
}
static void
skip_one_feature (char **pp)
{
char *e;
e = strchr (*pp, ',');
if (e)
*pp = e + 1;
else
*pp = *pp + strlen (*pp);
}
static gboolean
parse_features (const char *name G_GNUC_UNUSED,
const char *arg,
gpointer data,
GError **error G_GNUC_UNUSED)
{
shape_options_t *shape_opts = (shape_options_t *) data;
char *s = (char *) arg;
char *p;
shape_opts->num_features = 0;
g_free (shape_opts->features);
shape_opts->features = NULL;
if (!*s)
return true;
/* count the features first, so we can allocate memory */
p = s;
do {
shape_opts->num_features++;
p = strchr (p, ',');
if (p)
p++;
} while (p);
shape_opts->features = (hb_feature_t *) calloc (shape_opts->num_features, sizeof (*shape_opts->features));
/* now do the actual parsing */
p = s;
shape_opts->num_features = 0;
while (*p) {
if (parse_one_feature (&p, &shape_opts->features[shape_opts->num_features]))
shape_opts->num_features++;
else
skip_one_feature (&p);
}
return true;
}
void
view_options_t::add_options (option_parser_t *parser)
{
GOptionEntry entries[] =
{
{"annotate", 0, 0, G_OPTION_ARG_NONE, &this->annotate, "Annotate output rendering", NULL},
{"background", 0, 0, G_OPTION_ARG_STRING, &this->back, "Set background color (default: "DEFAULT_BACK")", "red/#rrggbb/#rrggbbaa"},
{"foreground", 0, 0, G_OPTION_ARG_STRING, &this->fore, "Set foreground color (default: "DEFAULT_FORE")", "red/#rrggbb/#rrggbbaa"},
{"line-space", 0, 0, G_OPTION_ARG_DOUBLE, &this->line_space, "Set space between lines (default: 0)", "units"},
{"margin", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) &parse_margin, "Margin around output (default: "G_STRINGIFY(DEFAULT_MARGIN)")","one to four numbers"},
{"font-size", 0, 0, G_OPTION_ARG_DOUBLE, &this->font_size, "Font size (default: "G_STRINGIFY(DEFAULT_FONT_SIZE)")","size"},
{NULL}
};
parser->add_group (entries,
"view",
"View options:",
"Options controlling output rendering",
this);
}
void
shape_options_t::add_options (option_parser_t *parser)
{
GOptionEntry entries[] =
{
{"list-shapers", 0, G_OPTION_FLAG_NO_ARG,
G_OPTION_ARG_CALLBACK, (gpointer) &list_shapers, "List available shapers and quit", NULL},
{"shaper", 0, G_OPTION_FLAG_HIDDEN,
G_OPTION_ARG_CALLBACK, (gpointer) &parse_shapers, "Hidden duplicate of --shapers", NULL},
{"shapers", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) &parse_shapers, "Comma-separated list of shapers to try","list"},
{"direction", 0, 0, G_OPTION_ARG_STRING, &this->direction, "Set text direction (default: auto)", "ltr/rtl/ttb/btt"},
{"language", 0, 0, G_OPTION_ARG_STRING, &this->language, "Set text language (default: $LANG)", "langstr"},
{"script", 0, 0, G_OPTION_ARG_STRING, &this->script, "Set text script (default: auto)", "ISO-15924 tag"},
{"utf8-clusters", 0, 0, G_OPTION_ARG_NONE, &this->utf8_clusters, "Use UTF8 byte indices, not char indices", NULL},
{NULL}
};
parser->add_group (entries,
"shape",
"Shape options:",
"Options controlling the shaping process",
this);
const gchar *features_help = "Comma-separated list of font features\n"
"\n"
" Features can be enabled or disabled, either globally or limited to\n"
" specific character ranges.\n"
"\n"
" The range indices refer to the positions between Unicode characters,\n"
" unless the --utf8-clusters is provided, in which case range indices\n"
" refer to UTF-8 byte indices. The position before the first character\n"
" is always 0.\n"
"\n"
" The format is Python-esque. Here is how it all works:\n"
"\n"
" Syntax: Value: Start: End:\n"
"\n"
" Setting value:\n"
" \"kern\" 1 0 ∞ # Turn feature on\n"
" \"+kern\" 1 0 ∞ # Turn feature on\n"
" \"-kern\" 0 0 ∞ # Turn feature off\n"
" \"kern=0\" 0 0 ∞ # Turn feature off\n"
" \"kern=1\" 1 0 ∞ # Turn feature on\n"
" \"aalt=2\" 2 0 ∞ # Choose 2nd alternate\n"
"\n"
" Setting index:\n"
" \"kern[]\" 1 0 ∞ # Turn feature on\n"
" \"kern[:]\" 1 0 ∞ # Turn feature on\n"
" \"kern[5:]\" 1 5 ∞ # Turn feature on, partial\n"
" \"kern[:5]\" 1 0 5 # Turn feature on, partial\n"
" \"kern[3:5]\" 1 3 5 # Turn feature on, range\n"
" \"kern[3]\" 1 3 3+1 # Turn feature on, single char\n"
"\n"
" Mixing it all:\n"
"\n"
" \"kern[3:5]=0\" 1 3 5 # Turn feature off for range";
GOptionEntry entries2[] =
{
{"features", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) &parse_features, features_help, "list"},
{NULL}
};
parser->add_group (entries2,
"features",
"Features options:",
"Options controlling font features used",
this);
}
void
font_options_t::add_options (option_parser_t *parser)
{
GOptionEntry entries[] =
{
{"font-file", 0, 0, G_OPTION_ARG_STRING, &this->font_file, "Font file-name", "filename"},
{"face-index", 0, 0, G_OPTION_ARG_INT, &this->face_index, "Face index (default: 0)", "index"},
{NULL}
};
parser->add_group (entries,
"font",
"Font options:",
"Options controlling the font",
this);
}
void
text_options_t::add_options (option_parser_t *parser)
{
GOptionEntry entries[] =
{
{"text", 0, 0, G_OPTION_ARG_STRING, &this->text, "Set input text", "string"},
{"text-file", 0, 0, G_OPTION_ARG_STRING, &this->text_file, "Set input text file-name\n\n If no text is provided, standard input is used for input.", "filename"},
{NULL}
};
parser->add_group (entries,
"text",
"Text options:",
"Options controlling the input text",
this);
}
void
output_options_t::add_options (option_parser_t *parser)
{
GOptionEntry entries[] =
{
{"output-file", 0, 0, G_OPTION_ARG_STRING, &this->output_file, "Set output file-name (default: stdout)","filename"},
{"output-format", 0, 0, G_OPTION_ARG_STRING, &this->output_format, "Set output format", "format"},
{NULL}
};
parser->add_group (entries,
"output",
"Output options:",
"Options controlling the output",
this);
}
hb_font_t *
font_options_t::get_font (void) const
{
if (font)
return font;
hb_blob_t *blob = NULL;
/* Create the blob */
{
char *font_data;
unsigned int len = 0;
hb_destroy_func_t destroy;
void *user_data;
hb_memory_mode_t mm;
/* This is a hell of a lot of code for just reading a file! */
if (!font_file)
fail (true, "No font file set");
if (0 == strcmp (font_file, "-")) {
/* read it */
GString *gs = g_string_new (NULL);
char buf[BUFSIZ];
#ifdef HAVE__SETMODE
_setmode (fileno (stdin), _O_BINARY);
#endif
while (!feof (stdin)) {
size_t ret = fread (buf, 1, sizeof (buf), stdin);
if (ferror (stdin))
fail (false, "Failed reading font from standard input: %s",
strerror (errno));
g_string_append_len (gs, buf, ret);
}
len = gs->len;
font_data = g_string_free (gs, false);
user_data = font_data;
destroy = (hb_destroy_func_t) g_free;
mm = HB_MEMORY_MODE_WRITABLE;
} else {
GError *error = NULL;
GMappedFile *mf = g_mapped_file_new (font_file, false, &error);
if (mf) {
font_data = g_mapped_file_get_contents (mf);
len = g_mapped_file_get_length (mf);
if (len) {
destroy = (hb_destroy_func_t) g_mapped_file_unref;
user_data = (void *) mf;
mm = HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE;
} else
g_mapped_file_unref (mf);
} else {
fail (false, "%s", error->message);
//g_error_free (error);
}
if (!len) {
/* GMappedFile is buggy, it doesn't fail if file isn't regular.
* Try reading.
* https://bugzilla.gnome.org/show_bug.cgi?id=659212 */
GError *error = NULL;
gsize l;
if (g_file_get_contents (font_file, &font_data, &l, &error)) {
len = l;
destroy = (hb_destroy_func_t) g_free;
user_data = (void *) font_data;
mm = HB_MEMORY_MODE_WRITABLE;
} else {
fail (false, "%s", error->message);
//g_error_free (error);
}
}
}
blob = hb_blob_create (font_data, len, mm, user_data, destroy);
}
/* Create the face */
hb_face_t *face = hb_face_create (blob, face_index);
hb_blob_destroy (blob);
font = hb_font_create (face);
unsigned int upem = hb_face_get_upem (face);
hb_font_set_scale (font, upem, upem);
hb_face_destroy (face);
#ifdef HAVE_FREETYPE
hb_ft_font_set_funcs (font);
#endif
return font;
}
const char *
text_options_t::get_line (unsigned int *len)
{
if (text) {
if (text_len == (unsigned int) -1)
text_len = strlen (text);
if (!text_len) {
*len = 0;
return NULL;
}
const char *ret = text;
const char *p = (const char *) memchr (text, '\n', text_len);
unsigned int ret_len;
if (!p) {
ret_len = text_len;
text += ret_len;
text_len = 0;
} else {
ret_len = p - ret;
text += ret_len + 1;
text_len -= ret_len + 1;
}
*len = ret_len;
return ret;
}
if (!fp) {
if (!text_file)
fail (true, "At least one of text or text-file must be set");
if (0 != strcmp (text_file, "-"))
fp = fopen (text_file, "r");
else
fp = stdin;
if (!fp)
fail (false, "Failed opening text file `%s': %s",
text_file, strerror (errno));
gs = g_string_new (NULL);
}
g_string_set_size (gs, 0);
char buf[BUFSIZ];
while (fgets (buf, sizeof (buf), fp)) {
unsigned int bytes = strlen (buf);
if (bytes && buf[bytes - 1] == '\n') {
bytes--;
g_string_append_len (gs, buf, bytes);
break;
}
g_string_append_len (gs, buf, bytes);
}
if (ferror (fp))
fail (false, "Failed reading text: %s",
strerror (errno));
*len = gs->len;
return !*len && feof (fp) ? NULL : gs->str;
}
FILE *
output_options_t::get_file_handle (void)
{
if (fp)
return fp;
if (output_file)
fp = fopen (output_file, "wb");
else {
#ifdef HAVE__SETMODE
_setmode (fileno (stdout), _O_BINARY);
#endif
fp = stdout;
}
if (!fp)
fail (false, "Cannot open output file `%s': %s",
g_filename_display_name (output_file), strerror (errno));
return fp;
}
static gboolean
parse_verbose (const char *name G_GNUC_UNUSED,
const char *arg G_GNUC_UNUSED,
gpointer data G_GNUC_UNUSED,
GError **error G_GNUC_UNUSED)
{
format_options_t *format_opts = (format_options_t *) data;
format_opts->show_text = format_opts->show_unicode = format_opts->show_line_num = true;
return true;
}
void
format_options_t::add_options (option_parser_t *parser)
{
GOptionEntry entries[] =
{
{"no-glyph-names", 0, G_OPTION_FLAG_REVERSE, G_OPTION_ARG_NONE, &this->show_glyph_names, "Use glyph indices instead of names", NULL},
{"no-positions", 0, G_OPTION_FLAG_REVERSE, G_OPTION_ARG_NONE, &this->show_positions, "Do not show glyph positions", NULL},
{"no-clusters", 0, G_OPTION_FLAG_REVERSE, G_OPTION_ARG_NONE, &this->show_clusters, "Do not show cluster mapping", NULL},
{"show-text", 0, 0, G_OPTION_ARG_NONE, &this->show_text, "Show input text", NULL},
{"show-unicode", 0, 0, G_OPTION_ARG_NONE, &this->show_unicode, "Show input Unicode codepoints", NULL},
{"show-line-num", 0, 0, G_OPTION_ARG_NONE, &this->show_line_num, "Show line numbers", NULL},
{"verbose", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,(gpointer) &parse_verbose, "Show everything", NULL},
{NULL}
};
parser->add_group (entries,
"format",
"Format options:",
"Options controlling the formatting of buffer contents",
this);
}
void
format_options_t::serialize_unicode (hb_buffer_t *buffer,
GString *gs)
{
unsigned int num_glyphs = hb_buffer_get_length (buffer);
hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, NULL);
g_string_append_c (gs, '<');
for (unsigned int i = 0; i < num_glyphs; i++)
{
if (i)
g_string_append_c (gs, ',');
g_string_append_printf (gs, "U+%04X", info->codepoint);
info++;
}
g_string_append_c (gs, '>');
}
void
format_options_t::serialize_glyphs (hb_buffer_t *buffer,
hb_font_t *font,
hb_bool_t utf8_clusters,
GString *gs)
{
unsigned int num_glyphs = hb_buffer_get_length (buffer);
hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, NULL);
hb_glyph_position_t *pos = hb_buffer_get_glyph_positions (buffer, NULL);
g_string_append_c (gs, '[');
for (unsigned int i = 0; i < num_glyphs; i++)
{
if (i)
g_string_append_c (gs, '|');
char glyph_name[32];
if (show_glyph_names) {
hb_font_get_glyph_name (font, info->codepoint, glyph_name, sizeof (glyph_name));
g_string_append_printf (gs, "%s", glyph_name);
} else
g_string_append_printf (gs, "%u", info->codepoint);
if (show_clusters) {
g_string_append_printf (gs, "=%u", info->cluster);
if (utf8_clusters)
g_string_append (gs, "u8");
}
if (show_positions && (pos->x_offset || pos->y_offset)) {
g_string_append_c (gs, '@');
if (pos->x_offset) g_string_append_printf (gs, "%d", pos->x_offset);
if (pos->y_offset) g_string_append_printf (gs, ",%d", pos->y_offset);
}
if (show_positions && (pos->x_advance || pos->y_advance)) {
g_string_append_c (gs, '+');
if (pos->x_advance) g_string_append_printf (gs, "%d", pos->x_advance);
if (pos->y_advance) g_string_append_printf (gs, ",%d", pos->y_advance);
}
info++;
pos++;
}
g_string_append_c (gs, ']');
}
void
format_options_t::serialize_line_no (unsigned int line_no,
GString *gs)
{
if (show_line_num)
g_string_append_printf (gs, "%d: ", line_no);
}
void
format_options_t::serialize_buffer_of_text (hb_buffer_t *buffer,
unsigned int line_no,
const char *text,
unsigned int text_len,
hb_font_t *font,
hb_bool_t utf8_clusters,
GString *gs)
{
if (show_text) {
serialize_line_no (line_no, gs);
g_string_append_c (gs, '(');
g_string_append_len (gs, text, text_len);
g_string_append_c (gs, ')');
g_string_append_c (gs, '\n');
}
if (show_unicode) {
serialize_line_no (line_no, gs);
serialize_unicode (buffer, gs);
g_string_append_c (gs, '\n');
}
}
void
format_options_t::serialize_message (unsigned int line_no,
const char *msg,
GString *gs)
{
serialize_line_no (line_no, gs);
g_string_append_printf (gs, "%s", msg);
g_string_append_c (gs, '\n');
}
void
format_options_t::serialize_buffer_of_glyphs (hb_buffer_t *buffer,
unsigned int line_no,
const char *text,
unsigned int text_len,
hb_font_t *font,
hb_bool_t utf8_clusters,
GString *gs)
{
serialize_line_no (line_no, gs);
serialize_glyphs (buffer, font, utf8_clusters, gs);
g_string_append_c (gs, '\n');
}