diff --git a/src/hb-subset-plan.cc b/src/hb-subset-plan.cc
index af4fcb813..aca96bf1b 100644
--- a/src/hb-subset-plan.cc
+++ b/src/hb-subset-plan.cc
@@ -111,7 +111,7 @@ static void _collect_layout_indices (hb_face_t		  *face,
       retain_all_features = false;
       continue;
     }
-    
+
     if (visited_features.has (tag))
       continue;
 
@@ -249,9 +249,9 @@ static void _colr_closure (hb_face_t *face,
     hb_set_t glyphset_colrv0;
     for (hb_codepoint_t gid : glyphs_colred->iter ())
       colr.closure_glyphs (gid, &glyphset_colrv0);
-    
+
     glyphs_colred->union_ (glyphset_colrv0);
-    
+
     //closure for COLRv1
     colr.closure_forV1 (glyphs_colred, &layer_indices, &palette_indices);
   } while (iteration_count++ <= HB_CLOSURE_MAX_STAGES &&
@@ -469,7 +469,7 @@ _nameid_closure (hb_face_t *face,
  * Return value: (transfer full): New subset plan. Destroy with
  * hb_subset_plan_destroy().
  *
- * Since: 1.7.5
+ * Since: REPLACEME
  **/
 hb_subset_plan_t *
 hb_subset_plan_create (hb_face_t	 *face,
@@ -542,7 +542,7 @@ hb_subset_plan_create (hb_face_t	 *face,
  * Decreases the reference count on @plan, and if it reaches zero, destroys
  * @plan, freeing all memory.
  *
- * Since: 1.7.5
+ * Since: REPLACEME
  **/
 void
 hb_subset_plan_destroy (hb_subset_plan_t *plan)
@@ -596,3 +596,48 @@ hb_subset_plan_destroy (hb_subset_plan_t *plan)
 
   hb_free (plan);
 }
+
+/**
+ * hb_subset_plan_old_to_new_glyph_mapping:
+ * @plan: a subsetting plan.
+ *
+ * Returns the mapping between glyphs in the original font to glyphs
+ * in the subset that will be produced by @plan.
+ *
+ * Since: REPLACEME
+ **/
+const hb_map_t*
+hb_subset_plan_old_to_new_glyph_mapping (const hb_subset_plan_t *plan)
+{
+  return plan->glyph_map;
+}
+
+/**
+ * hb_subset_plan_old_to_new_glyph_mapping:
+ * @plan: a subsetting plan.
+ *
+ * Returns the mapping between glyphs in the subset that will be produced by
+ * @plan and the glyph in the original font.
+ *
+ * Since: REPLACEME
+ **/
+const hb_map_t*
+hb_subset_plan_new_to_old_glyph_mapping (const hb_subset_plan_t *plan)
+{
+  return plan->reverse_glyph_map;
+}
+
+/**
+ * hb_subset_plan_old_to_new_glyph_mapping:
+ * @plan: a subsetting plan.
+ *
+ * Returns the mapping between codepoints in the original font and the
+ * associated glyph id in the original font.
+ *
+ * Since: REPLACEME
+ **/
+const hb_map_t*
+hb_subset_plan_codepoint_to_old_glyph_mapping (const hb_subset_plan_t *plan)
+{
+  return plan->codepoint_to_glyph;
+}
diff --git a/src/hb-subset-plan.hh b/src/hb-subset-plan.hh
index b9244e5cb..ab2c4c302 100644
--- a/src/hb-subset-plan.hh
+++ b/src/hb-subset-plan.hh
@@ -198,13 +198,4 @@ struct hb_subset_plan_t
   }
 };
 
-typedef struct hb_subset_plan_t hb_subset_plan_t;
-
-HB_INTERNAL hb_subset_plan_t *
-hb_subset_plan_create (hb_face_t           *face,
-		       const hb_subset_input_t   *input);
-
-HB_INTERNAL void
-hb_subset_plan_destroy (hb_subset_plan_t *plan);
-
 #endif /* HB_SUBSET_PLAN_HH */
diff --git a/src/hb-subset.cc b/src/hb-subset.cc
index bb46e5b97..a45e57f17 100644
--- a/src/hb-subset.cc
+++ b/src/hb-subset.cc
@@ -349,11 +349,33 @@ hb_subset_or_fail (hb_face_t *source, const hb_subset_input_t *input)
     return nullptr;
   }
 
+  hb_face_t * result = hb_subset_from_plan_or_fail (plan);
+  hb_subset_plan_destroy (plan);
+  return result;
+}
+
+
+/**
+ * hb_subset_from_plan_or_fail:
+ * @plan: a subsetting plan.
+ *
+ * Subsets a font according to provided plan. Returns nullptr
+ * if the subset operation fails.
+ *
+ * Since: REPLACEME
+ **/
+hb_face_t *
+hb_subset_from_plan_or_fail (hb_subset_plan_t *plan)
+{
+  if (unlikely (plan->in_error ())) {
+    return nullptr;
+  }
+
   hb_set_t tags_set;
   bool success = true;
   hb_tag_t table_tags[32];
   unsigned offset = 0, num_tables = ARRAY_LENGTH (table_tags);
-  while ((hb_face_get_table_tags (source, offset, &num_tables, table_tags), num_tables))
+  while ((hb_face_get_table_tags (plan->source, offset, &num_tables, table_tags), num_tables))
   {
     for (unsigned i = 0; i < num_tables; ++i)
     {
@@ -367,8 +389,5 @@ hb_subset_or_fail (hb_face_t *source, const hb_subset_input_t *input)
   }
 end:
 
-  hb_face_t *result = success ? hb_face_reference (plan->dest) : nullptr;
-
-  hb_subset_plan_destroy (plan);
-  return result;
+  return success ? hb_face_reference (plan->dest) : nullptr;
 }
diff --git a/src/hb-subset.h b/src/hb-subset.h
index 1c65a4da1..919c4e798 100644
--- a/src/hb-subset.h
+++ b/src/hb-subset.h
@@ -39,6 +39,15 @@ HB_BEGIN_DECLS
 
 typedef struct hb_subset_input_t hb_subset_input_t;
 
+/**
+ * hb_subset_plan_t:
+ *
+ * Contains information about how the subset operation will be executed.
+ * Such as mappings from the old glyph ids to the new ones in the subset.
+ */
+
+typedef struct hb_subset_plan_t hb_subset_plan_t;
+
 /**
  * hb_subset_flags_t:
  * @HB_SUBSET_FLAGS_DEFAULT: all flags at their default value of false.
@@ -145,6 +154,25 @@ hb_subset_input_set_flags (hb_subset_input_t *input,
 HB_EXTERN hb_face_t *
 hb_subset_or_fail (hb_face_t *source, const hb_subset_input_t *input);
 
+HB_EXTERN hb_face_t *
+hb_subset_from_plan_or_fail (hb_subset_plan_t *plan);
+
+HB_EXTERN hb_subset_plan_t *
+hb_subset_plan_create (hb_face_t           *face,
+		       const hb_subset_input_t   *input);
+
+HB_EXTERN void
+hb_subset_plan_destroy (hb_subset_plan_t *plan);
+
+HB_EXTERN const hb_map_t*
+hb_subset_plan_old_to_new_glyph_mapping (const hb_subset_plan_t *plan);
+
+HB_EXTERN const hb_map_t*
+hb_subset_plan_new_to_old_glyph_mapping (const hb_subset_plan_t *plan);
+
+HB_EXTERN const hb_map_t*
+hb_subset_plan_codepoint_to_old_glyph_mapping (const hb_subset_plan_t *plan);
+
 HB_END_DECLS
 
 #endif /* HB_SUBSET_H */
diff --git a/test/api/test-subset.c b/test/api/test-subset.c
index 27bf73cc9..a4211dcb5 100644
--- a/test/api/test-subset.c
+++ b/test/api/test-subset.c
@@ -155,6 +155,43 @@ test_subset_sets (void)
   hb_subset_input_destroy (input);
 }
 
+static void
+test_subset_plan (void)
+{
+  hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");
+  hb_face_t *face_ac = hb_test_open_font_file ("fonts/Roboto-Regular.ac.ttf");
+
+  hb_set_t *codepoints = hb_set_create();
+  hb_set_add (codepoints, 97);
+  hb_set_add (codepoints, 99);
+  hb_subset_input_t* input = hb_subset_test_create_input (codepoints);
+  hb_set_destroy (codepoints);
+
+  hb_subset_plan_t* plan = hb_subset_plan_create (face_abc, input);
+
+  const hb_map_t* mapping = hb_subset_plan_old_to_new_glyph_mapping (plan);
+  g_assert (hb_map_get (mapping, 1) == 1);
+  g_assert (hb_map_get (mapping, 3) == 2);
+
+  mapping = hb_subset_plan_new_to_old_glyph_mapping (plan);
+  g_assert (hb_map_get (mapping, 1) == 1);
+  g_assert (hb_map_get (mapping, 2) == 3);
+
+  mapping = hb_subset_plan_codepoint_to_old_glyph_mapping (plan);
+  g_assert (hb_map_get (mapping, 0x63) == 3);
+
+  hb_face_t* face_abc_subset = hb_subset_from_plan_or_fail (plan);
+
+  hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('l','o','c', 'a'));
+  hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('g','l','y','f'));
+
+  hb_subset_input_destroy (input);
+  hb_subset_plan_destroy (plan);
+  hb_face_destroy (face_abc_subset);
+  hb_face_destroy (face_abc);
+  hb_face_destroy (face_ac);
+}
+
 int
 main (int argc, char **argv)
 {
@@ -165,6 +202,7 @@ main (int argc, char **argv)
   hb_test_add (test_subset_crash);
   hb_test_add (test_subset_set_flags);
   hb_test_add (test_subset_sets);
+  hb_test_add (test_subset_plan);
 
   return hb_test_run();
 }