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[subset] Add command line flag to provide a gid mapping.

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This commit is contained in:
Garret Rieger 2023-05-04 22:20:06 +00:00
parent 779e8297fa
commit 98e73192f4
2 changed files with 65 additions and 0 deletions
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5
src/hb-subset-input.cc
View file

@ -536,6 +536,11 @@ hb_subset_preprocess (hb_face_t *source)
* Note: if a glyph mapping is set with this function, then the retain gids
* setting will be ignored.
*
* Note: this will accept and apply non-monotonic mappings, however this
* may result in unsorted Coverage tables. Such fonts may not work for all
* use cases (for example ots will reject such coverage tables). So it's
* recommended, if possible, to supply a monotonic mapping.
*
* Since: REPLACEME
**/
HB_EXTERN void

60
util/hb-subset.cc
View file

@ -742,6 +742,65 @@ parse_instance (const char *name,
}
#endif
static gboolean
parse_glyph_map (const char *name,
const char *arg,
gpointer data,
GError **error)
{
// Glyph map has the following format:
// <entry 1>,<entry 2>,...,<entry n>
// <entry> = <old gid>:<new gid>
subset_main_t *subset_main = (subset_main_t *) data;
hb_subset_input_t* input = subset_main->input;
hb_map_t *mapping = hb_map_create ();
hb_set_t *glyphs = hb_subset_input_glyph_set(input);
char *s = (char *) arg;
char *p;
while (s && *s)
{
while (*s && strchr (", ", *s))
s++;
if (!*s)
break;
errno = 0;
hb_codepoint_t start_code = strtoul (s, &p, 10);
if (s[0] == '-' || errno || s == p)
{
g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE,
"Failed parsing glyph map at: '%s'", s);
return false;
}
if (!p || p[0] != ':') // ranges
{
g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE,
"Failed parsing glyph map at: '%s'", s);
return false;
}
s = ++p;
hb_codepoint_t end_code = strtoul (s, &p, 10);
if (s[0] == '-' || errno || s == p)
{
g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE,
"Failed parsing glyph map at: '%s'", s);
return false;
}
hb_set_add(glyphs, start_code);
hb_map_set (mapping, start_code, end_code);
s = p;
}
hb_subset_input_set_old_to_new_glyph_mapping(input, mapping);
return true;
}
template <GOptionArgFunc line_parser, bool allow_comments=true>
static gboolean
parse_file_for (const char *name,
@ -894,6 +953,7 @@ subset_main_t::add_options ()
GOptionEntry other_entries[] =
{
{"gid-map", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) &parse_glyph_map, "Specify a glyph mapping to use, any unmapped gids will be automatically assigned.", "List of pairs old_gid1:new_gid1,old_gid2:new_gid2,..."},
{"name-IDs", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) &parse_nameids, "Subset specified nameids. Use --name-IDs-=... to subtract from the current set.", "list of int numbers or *"},
{"name-IDs-", 0, G_OPTION_FLAG_HIDDEN, G_OPTION_ARG_CALLBACK, (gpointer) &parse_nameids, "Subset specified nameids", "list of int numbers or *"},
{"name-IDs+", 0, G_OPTION_FLAG_HIDDEN, G_OPTION_ARG_CALLBACK, (gpointer) &parse_nameids, "Subset specified nameids", "list of int numbers or *"},