1 files changed, 536 insertions, 88 deletions

diff --git a/src/3rdparty/harfbuzz-ng/src/hb-subset-input.cc b/src/3rdparty/harfbuzz-ng/src/hb-subset-input.cc
index fe9be3ce02..1e0a89a630 100644
--- a/src/3rdparty/harfbuzz-ng/src/hb-subset-input.cc
+++ b/src/3rdparty/harfbuzz-ng/src/hb-subset-input.cc
@@ -26,39 +26,24 @@
 
 #include "hb-subset.hh"
 #include "hb-set.hh"
+#include "hb-utf.hh"
 
-/**
- * hb_subset_input_create_or_fail:
- *
- * Return value: New subset input.
- *
- * Since: 1.8.0
- **/
-hb_subset_input_t *
-hb_subset_input_create_or_fail ()
+
+hb_subset_input_t::hb_subset_input_t ()
 {
-  hb_subset_input_t *input = hb_object_create<hb_subset_input_t>();
+  for (auto& set : sets_iter ())
+    set = hb::shared_ptr<hb_set_t> (hb_set_create ());
 
-  if (unlikely (!input))
-    return nullptr;
+  if (in_error ())
+    return;
+
+  flags = HB_SUBSET_FLAGS_DEFAULT;
 
-  input->unicodes = hb_set_create ();
-  input->glyphs = hb_set_create ();
-  input->name_ids = hb_set_create ();
-  hb_set_add_range (input->name_ids, 0, 6);
-  input->name_languages = hb_set_create ();
-  hb_set_add (input->name_languages, 0x0409);
-  input->drop_tables = hb_set_create ();
-  input->drop_hints = false;
-  input->desubroutinize = false;
-  input->retain_gids = false;
-  input->name_legacy = false;
+  hb_set_add_range (sets.name_ids, 0, 6);
+  hb_set_add (sets.name_languages, 0x0409);
 
   hb_tag_t default_drop_tables[] = {
     // Layout disabled by default
-    HB_TAG ('G', 'S', 'U', 'B'),
-    HB_TAG ('G', 'P', 'O', 'S'),
-    HB_TAG ('G', 'D', 'E', 'F'),
     HB_TAG ('m', 'o', 'r', 'x'),
     HB_TAG ('m', 'o', 'r', 't'),
     HB_TAG ('k', 'e', 'r', 'x'),
@@ -81,149 +66,612 @@ hb_subset_input_create_or_fail ()
     HB_TAG ('S', 'i', 'l', 'f'),
     HB_TAG ('S', 'i', 'l', 'l'),
   };
+  sets.drop_tables->add_array (default_drop_tables, ARRAY_LENGTH (default_drop_tables));
+
+  hb_tag_t default_no_subset_tables[] = {
+    HB_TAG ('g', 'a', 's', 'p'),
+    HB_TAG ('f', 'p', 'g', 'm'),
+    HB_TAG ('p', 'r', 'e', 'p'),
+    HB_TAG ('V', 'D', 'M', 'X'),
+    HB_TAG ('D', 'S', 'I', 'G'),
+  };
+  sets.no_subset_tables->add_array (default_no_subset_tables,
+					 ARRAY_LENGTH (default_no_subset_tables));
+
+  //copied from _layout_features_groups in fonttools
+  hb_tag_t default_layout_features[] = {
+    // default shaper
+    // common
+    HB_TAG ('r', 'v', 'r', 'n'),
+    HB_TAG ('c', 'c', 'm', 'p'),
+    HB_TAG ('l', 'i', 'g', 'a'),
+    HB_TAG ('l', 'o', 'c', 'l'),
+    HB_TAG ('m', 'a', 'r', 'k'),
+    HB_TAG ('m', 'k', 'm', 'k'),
+    HB_TAG ('r', 'l', 'i', 'g'),
+
+    //fractions
+    HB_TAG ('f', 'r', 'a', 'c'),
+    HB_TAG ('n', 'u', 'm', 'r'),
+    HB_TAG ('d', 'n', 'o', 'm'),
+
+    //horizontal
+    HB_TAG ('c', 'a', 'l', 't'),
+    HB_TAG ('c', 'l', 'i', 'g'),
+    HB_TAG ('c', 'u', 'r', 's'),
+    HB_TAG ('k', 'e', 'r', 'n'),
+    HB_TAG ('r', 'c', 'l', 't'),
+
+    //vertical
+    HB_TAG ('v', 'a', 'l', 't'),
+    HB_TAG ('v', 'e', 'r', 't'),
+    HB_TAG ('v', 'k', 'r', 'n'),
+    HB_TAG ('v', 'p', 'a', 'l'),
+    HB_TAG ('v', 'r', 't', '2'),
+
+    //ltr
+    HB_TAG ('l', 't', 'r', 'a'),
+    HB_TAG ('l', 't', 'r', 'm'),
+
+    //rtl
+    HB_TAG ('r', 't', 'l', 'a'),
+    HB_TAG ('r', 't', 'l', 'm'),
+
+    //random
+    HB_TAG ('r', 'a', 'n', 'd'),
+
+    //justify
+    HB_TAG ('j', 'a', 'l', 't'), // HarfBuzz doesn't use; others might
+
+    //East Asian spacing
+    HB_TAG ('c', 'h', 'w', 's'),
+    HB_TAG ('v', 'c', 'h', 'w'),
+    HB_TAG ('h', 'a', 'l', 't'),
+    HB_TAG ('v', 'h', 'a', 'l'),
+
+    //private
+    HB_TAG ('H', 'a', 'r', 'f'),
+    HB_TAG ('H', 'A', 'R', 'F'),
+    HB_TAG ('B', 'u', 'z', 'z'),
+    HB_TAG ('B', 'U', 'Z', 'Z'),
+
+    //shapers
+
+    //arabic
+    HB_TAG ('i', 'n', 'i', 't'),
+    HB_TAG ('m', 'e', 'd', 'i'),
+    HB_TAG ('f', 'i', 'n', 'a'),
+    HB_TAG ('i', 's', 'o', 'l'),
+    HB_TAG ('m', 'e', 'd', '2'),
+    HB_TAG ('f', 'i', 'n', '2'),
+    HB_TAG ('f', 'i', 'n', '3'),
+    HB_TAG ('c', 's', 'w', 'h'),
+    HB_TAG ('m', 's', 'e', 't'),
+    HB_TAG ('s', 't', 'c', 'h'),
+
+    //hangul
+    HB_TAG ('l', 'j', 'm', 'o'),
+    HB_TAG ('v', 'j', 'm', 'o'),
+    HB_TAG ('t', 'j', 'm', 'o'),
+
+    //tibetan
+    HB_TAG ('a', 'b', 'v', 's'),
+    HB_TAG ('b', 'l', 'w', 's'),
+    HB_TAG ('a', 'b', 'v', 'm'),
+    HB_TAG ('b', 'l', 'w', 'm'),
+
+    //indic
+    HB_TAG ('n', 'u', 'k', 't'),
+    HB_TAG ('a', 'k', 'h', 'n'),
+    HB_TAG ('r', 'p', 'h', 'f'),
+    HB_TAG ('r', 'k', 'r', 'f'),
+    HB_TAG ('p', 'r', 'e', 'f'),
+    HB_TAG ('b', 'l', 'w', 'f'),
+    HB_TAG ('h', 'a', 'l', 'f'),
+    HB_TAG ('a', 'b', 'v', 'f'),
+    HB_TAG ('p', 's', 't', 'f'),
+    HB_TAG ('c', 'f', 'a', 'r'),
+    HB_TAG ('v', 'a', 't', 'u'),
+    HB_TAG ('c', 'j', 'c', 't'),
+    HB_TAG ('i', 'n', 'i', 't'),
+    HB_TAG ('p', 'r', 'e', 's'),
+    HB_TAG ('a', 'b', 'v', 's'),
+    HB_TAG ('b', 'l', 'w', 's'),
+    HB_TAG ('p', 's', 't', 's'),
+    HB_TAG ('h', 'a', 'l', 'n'),
+    HB_TAG ('d', 'i', 's', 't'),
+    HB_TAG ('a', 'b', 'v', 'm'),
+    HB_TAG ('b', 'l', 'w', 'm'),
+  };
 
-  input->drop_tables->add_array (default_drop_tables, ARRAY_LENGTH (default_drop_tables));
+  sets.layout_features->add_array (default_layout_features, ARRAY_LENGTH (default_layout_features));
+
+  sets.layout_scripts->invert (); // Default to all scripts.
+}
+
+/**
+ * hb_subset_input_create_or_fail:
+ *
+ * Creates a new subset input object.
+ *
+ * Return value: (transfer full): New subset input, or `NULL` if failed. Destroy
+ * with hb_subset_input_destroy().
+ *
+ * Since: 1.8.0
+ **/
+hb_subset_input_t *
+hb_subset_input_create_or_fail (void)
+{
+  hb_subset_input_t *input = hb_object_create<hb_subset_input_t>();
+
+  if (unlikely (!input))
+    return nullptr;
+
+  if (input->in_error ())
+  {
+    hb_subset_input_destroy (input);
+    return nullptr;
+  }
 
   return input;
 }
 
 /**
  * hb_subset_input_reference: (skip)
- * @subset_input: a subset_input.
- *
+ * @input: a #hb_subset_input_t object.
  *
+ * Increases the reference count on @input.
  *
- * Return value:
+ * Return value: @input.
  *
  * Since: 1.8.0
  **/
 hb_subset_input_t *
-hb_subset_input_reference (hb_subset_input_t *subset_input)
+hb_subset_input_reference (hb_subset_input_t *input)
 {
-  return hb_object_reference (subset_input);
+  return hb_object_reference (input);
 }
 
 /**
  * hb_subset_input_destroy:
- * @subset_input: a subset_input.
+ * @input: a #hb_subset_input_t object.
+ *
+ * Decreases the reference count on @input, and if it reaches zero, destroys
+ * @input, freeing all memory.
  *
  * Since: 1.8.0
  **/
 void
-hb_subset_input_destroy (hb_subset_input_t *subset_input)
+hb_subset_input_destroy (hb_subset_input_t *input)
 {
-  if (!hb_object_destroy (subset_input)) return;
-
-  hb_set_destroy (subset_input->unicodes);
-  hb_set_destroy (subset_input->glyphs);
-  hb_set_destroy (subset_input->name_ids);
-  hb_set_destroy (subset_input->name_languages);
-  hb_set_destroy (subset_input->drop_tables);
+  if (!hb_object_destroy (input)) return;
 
-  free (subset_input);
+  hb_free (input);
 }
 
 /**
  * hb_subset_input_unicode_set:
- * @subset_input: a subset_input.
+ * @input: a #hb_subset_input_t object.
+ *
+ * Gets the set of Unicode code points to retain, the caller should modify the
+ * set as needed.
+ *
+ * Return value: (transfer none): pointer to the #hb_set_t of Unicode code
+ * points.
  *
  * Since: 1.8.0
  **/
 HB_EXTERN hb_set_t *
-hb_subset_input_unicode_set (hb_subset_input_t *subset_input)
+hb_subset_input_unicode_set (hb_subset_input_t *input)
 {
-  return subset_input->unicodes;
+  return input->sets.unicodes;
 }
 
 /**
  * hb_subset_input_glyph_set:
- * @subset_input: a subset_input.
+ * @input: a #hb_subset_input_t object.
+ *
+ * Gets the set of glyph IDs to retain, the caller should modify the set as
+ * needed.
+ *
+ * Return value: (transfer none): pointer to the #hb_set_t of glyph IDs.
  *
  * Since: 1.8.0
  **/
 HB_EXTERN hb_set_t *
-hb_subset_input_glyph_set (hb_subset_input_t *subset_input)
+hb_subset_input_glyph_set (hb_subset_input_t *input)
 {
-  return subset_input->glyphs;
+  return input->sets.glyphs;
 }
 
+/**
+ * hb_subset_input_set:
+ * @input: a #hb_subset_input_t object.
+ * @set_type: a #hb_subset_sets_t set type.
+ *
+ * Gets the set of the specified type.
+ *
+ * Return value: (transfer none): pointer to the #hb_set_t of the specified type.
+ *
+ * Since: 2.9.1
+ **/
 HB_EXTERN hb_set_t *
-hb_subset_input_nameid_set (hb_subset_input_t *subset_input)
+hb_subset_input_set (hb_subset_input_t *input, hb_subset_sets_t set_type)
 {
-  return subset_input->name_ids;
+  return input->sets_iter () [set_type];
 }
 
-HB_EXTERN hb_set_t *
-hb_subset_input_namelangid_set (hb_subset_input_t *subset_input)
+/**
+ * hb_subset_input_get_flags:
+ * @input: a #hb_subset_input_t object.
+ *
+ * Gets all of the subsetting flags in the input object.
+ *
+ * Return value: the subsetting flags bit field.
+ *
+ * Since: 2.9.0
+ **/
+HB_EXTERN hb_subset_flags_t
+hb_subset_input_get_flags (hb_subset_input_t *input)
 {
-  return subset_input->name_languages;
+  return (hb_subset_flags_t) input->flags;
 }
 
-HB_EXTERN hb_set_t *
-hb_subset_input_drop_tables_set (hb_subset_input_t *subset_input)
+/**
+ * hb_subset_input_set_flags:
+ * @input: a #hb_subset_input_t object.
+ * @value: bit field of flags
+ *
+ * Sets all of the flags in the input object to the values specified by the bit
+ * field.
+ *
+ * Since: 2.9.0
+ **/
+HB_EXTERN void
+hb_subset_input_set_flags (hb_subset_input_t *input,
+			   unsigned value)
 {
-  return subset_input->drop_tables;
+  input->flags = (hb_subset_flags_t) value;
 }
 
-HB_EXTERN void
-hb_subset_input_set_drop_hints (hb_subset_input_t *subset_input,
-				hb_bool_t drop_hints)
+/**
+ * hb_subset_input_set_user_data: (skip)
+ * @input: a #hb_subset_input_t object.
+ * @key: The user-data key to set
+ * @data: A pointer to the user data
+ * @destroy: (nullable): A callback to call when @data is not needed anymore
+ * @replace: Whether to replace an existing data with the same key
+ *
+ * Attaches a user-data key/data pair to the given subset input object.
+ *
+ * Return value: `true` if success, `false` otherwise
+ *
+ * Since: 2.9.0
+ **/
+hb_bool_t
+hb_subset_input_set_user_data (hb_subset_input_t  *input,
+			       hb_user_data_key_t *key,
+			       void *		   data,
+			       hb_destroy_func_t   destroy,
+			       hb_bool_t	   replace)
 {
-  subset_input->drop_hints = drop_hints;
+  return hb_object_set_user_data (input, key, data, destroy, replace);
 }
 
-HB_EXTERN hb_bool_t
-hb_subset_input_get_drop_hints (hb_subset_input_t *subset_input)
+/**
+ * hb_subset_input_get_user_data: (skip)
+ * @input: a #hb_subset_input_t object.
+ * @key: The user-data key to query
+ *
+ * Fetches the user data associated with the specified key,
+ * attached to the specified subset input object.
+ *
+ * Return value: (transfer none): A pointer to the user data
+ *
+ * Since: 2.9.0
+ **/
+void *
+hb_subset_input_get_user_data (const hb_subset_input_t *input,
+			       hb_user_data_key_t     *key)
 {
-  return subset_input->drop_hints;
+  return hb_object_get_user_data (input, key);
 }
 
-HB_EXTERN void
-hb_subset_input_set_desubroutinize (hb_subset_input_t *subset_input,
-				    hb_bool_t desubroutinize)
+/**
+ * hb_subset_input_keep_everything:
+ * @input: a #hb_subset_input_t object
+ *
+ * Configure input object to keep everything in the font face.
+ * That is, all Unicodes, glyphs, names, layout items,
+ * glyph names, etc.
+ *
+ * The input can be tailored afterwards by the caller.
+ *
+ * Since: 7.0.0
+ */
+void
+hb_subset_input_keep_everything (hb_subset_input_t *input)
 {
-  subset_input->desubroutinize = desubroutinize;
+  const hb_subset_sets_t indices[] = {HB_SUBSET_SETS_UNICODE,
+				      HB_SUBSET_SETS_GLYPH_INDEX,
+				      HB_SUBSET_SETS_NAME_ID,
+				      HB_SUBSET_SETS_NAME_LANG_ID,
+				      HB_SUBSET_SETS_LAYOUT_FEATURE_TAG,
+				      HB_SUBSET_SETS_LAYOUT_SCRIPT_TAG};
+
+  for (auto idx : hb_iter (indices))
+  {
+    hb_set_t *set = hb_subset_input_set (input, idx);
+    hb_set_clear (set);
+    hb_set_invert (set);
+  }
+
+  // Don't drop any tables
+  hb_set_clear (hb_subset_input_set (input, HB_SUBSET_SETS_DROP_TABLE_TAG));
+
+  hb_subset_input_set_flags (input,
+			     HB_SUBSET_FLAGS_NOTDEF_OUTLINE |
+			     HB_SUBSET_FLAGS_GLYPH_NAMES |
+			     HB_SUBSET_FLAGS_NO_PRUNE_UNICODE_RANGES |
+                             HB_SUBSET_FLAGS_PASSTHROUGH_UNRECOGNIZED);
 }
 
+#ifndef HB_NO_VAR
+/**
+ * hb_subset_input_pin_axis_to_default: (skip)
+ * @input: a #hb_subset_input_t object.
+ * @face: a #hb_face_t object.
+ * @axis_tag: Tag of the axis to be pinned
+ *
+ * Pin an axis to its default location in the given subset input object.
+ *
+ * All axes in a font must be pinned. Additionally, `CFF2` table, if present,
+ * will be de-subroutinized.
+ *
+ * Return value: `true` if success, `false` otherwise
+ *
+ * Since: 6.0.0
+ **/
 HB_EXTERN hb_bool_t
-hb_subset_input_get_desubroutinize (hb_subset_input_t *subset_input)
+hb_subset_input_pin_axis_to_default (hb_subset_input_t  *input,
+                                     hb_face_t          *face,
+                                     hb_tag_t            axis_tag)
 {
-  return subset_input->desubroutinize;
+  hb_ot_var_axis_info_t axis_info;
+  if (!hb_ot_var_find_axis_info (face, axis_tag, &axis_info))
+    return false;
+
+  float default_val = axis_info.default_value;
+  return input->axes_location.set (axis_tag, Triple (default_val, default_val, default_val));
 }
 
 /**
- * hb_subset_input_set_retain_gids:
- * @subset_input: a subset_input.
- * @retain_gids: If true the subsetter will not renumber glyph ids.
- * Since: 2.4.0
+ * hb_subset_input_pin_axis_location: (skip)
+ * @input: a #hb_subset_input_t object.
+ * @face: a #hb_face_t object.
+ * @axis_tag: Tag of the axis to be pinned
+ * @axis_value: Location on the axis to be pinned at
+ *
+ * Pin an axis to a fixed location in the given subset input object.
+ *
+ * All axes in a font must be pinned. Additionally, `CFF2` table, if present,
+ * will be de-subroutinized.
+ *
+ * Return value: `true` if success, `false` otherwise
+ *
+ * Since: 6.0.0
  **/
-HB_EXTERN void
-hb_subset_input_set_retain_gids (hb_subset_input_t *subset_input,
-				 hb_bool_t retain_gids)
+HB_EXTERN hb_bool_t
+hb_subset_input_pin_axis_location (hb_subset_input_t  *input,
+                                   hb_face_t          *face,
+                                   hb_tag_t            axis_tag,
+                                   float               axis_value)
 {
-  subset_input->retain_gids = retain_gids;
+  hb_ot_var_axis_info_t axis_info;
+  if (!hb_ot_var_find_axis_info (face, axis_tag, &axis_info))
+    return false;
+
+  float val = hb_clamp(axis_value, axis_info.min_value, axis_info.max_value);
+  return input->axes_location.set (axis_tag, Triple (val, val, val));
 }
 
+#ifdef HB_EXPERIMENTAL_API
 /**
- * hb_subset_input_get_retain_gids:
- * Returns: value of retain_gids.
- * Since: 2.4.0
+ * hb_subset_input_set_axis_range: (skip)
+ * @input: a #hb_subset_input_t object.
+ * @face: a #hb_face_t object.
+ * @axis_tag: Tag of the axis
+ * @axis_min_value: Minimum value of the axis variation range to set
+ * @axis_max_value: Maximum value of the axis variation range to set
+ * @axis_def_value: Default value of the axis variation range to set, in case of
+ * null, it'll be determined automatically
+ *
+ * Restricting the range of variation on an axis in the given subset input object.
+ * New min/default/max values will be clamped if they're not within the fvar axis range.
+ * If the new default value is null:
+ * If the fvar axis default value is within the new range, then new default
+ * value is the same as original default value.
+ * If the fvar axis default value is not within the new range, the new default
+ * value will be changed to the new min or max value, whichever is closer to the fvar
+ * axis default.
+ *
+ * Note: input min value can not be bigger than input max value. If the input
+ * default value is not within the new min/max range, it'll be clamped.
+ * Note: currently it supports gvar and cvar tables only.
+ *
+ * Return value: `true` if success, `false` otherwise
+ *
+ * XSince: EXPERIMENTAL
  **/
 HB_EXTERN hb_bool_t
-hb_subset_input_get_retain_gids (hb_subset_input_t *subset_input)
+hb_subset_input_set_axis_range (hb_subset_input_t  *input,
+                                hb_face_t          *face,
+                                hb_tag_t            axis_tag,
+                                float               axis_min_value,
+                                float               axis_max_value,
+                                float              *axis_def_value /* IN, maybe NULL */)
 {
-  return subset_input->retain_gids;
+  if (axis_min_value > axis_max_value)
+    return false;
+
+  hb_ot_var_axis_info_t axis_info;
+  if (!hb_ot_var_find_axis_info (face, axis_tag, &axis_info))
+    return false;
+
+  float new_min_val = hb_clamp(axis_min_value, axis_info.min_value, axis_info.max_value);
+  float new_max_val = hb_clamp(axis_max_value, axis_info.min_value, axis_info.max_value);
+  float new_default_val = axis_def_value ? *axis_def_value : axis_info.default_value;
+  new_default_val = hb_clamp(new_default_val, new_min_val, new_max_val);
+  return input->axes_location.set (axis_tag, Triple (new_min_val, new_default_val, new_max_val));
 }
+#endif
+#endif
 
-HB_EXTERN void
-hb_subset_input_set_name_legacy (hb_subset_input_t *subset_input,
-				 hb_bool_t name_legacy)
+/**
+ * hb_subset_preprocess:
+ * @source: a #hb_face_t object.
+ *
+ * Preprocesses the face and attaches data that will be needed by the
+ * subsetter. Future subsetting operations can then use the precomputed data
+ * to speed up the subsetting operation.
+ *
+ * See [subset-preprocessing](https://github.com/harfbuzz/harfbuzz/blob/main/docs/subset-preprocessing.md)
+ * for more information.
+ *
+ * Note: the preprocessed face may contain sub-blobs that reference the memory
+ * backing the source #hb_face_t. Therefore in the case that this memory is not
+ * owned by the source face you will need to ensure that memory lives
+ * as long as the returned #hb_face_t.
+ *
+ * Returns: a new #hb_face_t.
+ *
+ * Since: 6.0.0
+ **/
+
+HB_EXTERN hb_face_t *
+hb_subset_preprocess (hb_face_t *source)
 {
-  subset_input->name_legacy = name_legacy;
+  hb_subset_input_t* input = hb_subset_input_create_or_fail ();
+  if (!input)
+    return hb_face_reference (source);
+
+  hb_subset_input_keep_everything (input);
+
+  input->attach_accelerator_data = true;
+
+  // Always use long loca in the preprocessed version. This allows
+  // us to store the glyph bytes unpadded which allows the future subset
+  // operation to run faster by skipping the trim padding step.
+  input->force_long_loca = true;
+
+  hb_face_t* new_source = hb_subset_or_fail (source, input);
+  hb_subset_input_destroy (input);
+
+  if (!new_source) {
+    DEBUG_MSG (SUBSET, nullptr, "Preprocessing failed due to subset failure.");
+    return hb_face_reference (source);
+  }
+
+  return new_source;
 }
 
+/**
+ * hb_subset_input_old_to_new_glyph_mapping:
+ * @input: a #hb_subset_input_t object.
+ *
+ * Returns a map which can be used to provide an explicit mapping from old to new glyph
+ * id's in the produced subset. The caller should populate the map as desired.
+ * If this map is left empty then glyph ids will be automatically mapped to new
+ * values by the subsetter. If populated, the mapping must be unique. That
+ * is no two original glyph ids can be mapped to the same new id.
+ * Additionally, if a mapping is provided then the retain gids option cannot
+ * be enabled.
+ *
+ * Any glyphs that are retained in the subset which are not specified
+ * in this mapping will be assigned glyph ids after the highest glyph
+ * id in the mapping.
+ *
+ * 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 unsorted coverage tables). So it's
+ * recommended, if possible, to supply a monotonic mapping.
+ *
+ * Return value: (transfer none): pointer to the #hb_map_t of the custom glyphs ID map.
+ *
+ * Since: 7.3.0
+ **/
+HB_EXTERN hb_map_t*
+hb_subset_input_old_to_new_glyph_mapping (hb_subset_input_t *input)
+{
+  return &input->glyph_map;
+}
+
+#ifdef HB_EXPERIMENTAL_API
+/**
+ * hb_subset_input_override_name_table:
+ * @input: a #hb_subset_input_t object.
+ * @name_id: name_id of a nameRecord
+ * @platform_id: platform ID of a nameRecord
+ * @encoding_id: encoding ID of a nameRecord
+ * @language_id: language ID of a nameRecord
+ * @name_str: pointer to name string new value or null to indicate should remove
+ * @str_len: the size of @name_str, or -1 if it is `NULL`-terminated
+ *
+ * Override the name string of the NameRecord identified by name_id,
+ * platform_id, encoding_id and language_id. If a record with that name_id
+ * doesn't exist, create it and insert to the name table.
+ *
+ * Note: for mac platform, we only support name_str with all ascii characters,
+ * name_str with non-ascii characters will be ignored.
+ *
+ * XSince: EXPERIMENTAL
+ **/
 HB_EXTERN hb_bool_t
-hb_subset_input_get_name_legacy (hb_subset_input_t *subset_input)
+hb_subset_input_override_name_table (hb_subset_input_t  *input,
+                                     hb_ot_name_id_t     name_id,
+                                     unsigned            platform_id,
+                                     unsigned            encoding_id,
+                                     unsigned            language_id,
+                                     const char         *name_str,
+                                     int                 str_len /* -1 means nul-terminated */)
 {
-  return subset_input->name_legacy;
+  if (!name_str)
+  {
+    str_len = 0;
+  }
+  else if (str_len == -1)
+  {
+      str_len = strlen (name_str);
+  }
+
+  hb_bytes_t name_bytes (nullptr, 0);
+  if (str_len)
+  {
+    if (platform_id == 1)
+    {
+      const uint8_t *src = reinterpret_cast<const uint8_t*> (name_str);
+      const uint8_t *src_end = src + str_len;
+
+      hb_codepoint_t unicode;
+      const hb_codepoint_t replacement = HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT;
+      while (src < src_end)
+      {
+        src = hb_utf8_t::next (src, src_end, &unicode, replacement);
+        if (unicode >= 0x0080u)
+        {
+          printf ("Non-ascii character detected, ignored...This API supports acsii characters only for mac platform\n");
+          return false;
+        }
+      }
+    }
+    char *override_name = (char *) hb_malloc (str_len);
+    if (unlikely (!override_name)) return false;
+
+    hb_memcpy (override_name, name_str, str_len);
+    name_bytes = hb_bytes_t (override_name, str_len);
+  }
+  input->name_table_overrides.set (hb_ot_name_record_ids_t (platform_id, encoding_id, language_id, name_id), name_bytes);
+  return true;
 }
+
+#endif