diff --git a/src/dump-emoji.cc b/src/dump-emoji.cc
index 7c7392f20..73305aa77 100644
--- a/src/dump-emoji.cc
+++ b/src/dump-emoji.cc
@@ -58,15 +58,30 @@ cbdt_callback (const uint8_t* data, unsigned int length,
 }
 
 static void
-sbix_callback (hb_blob_t *blob, unsigned int group, unsigned int gid)
+sbix_dump (hb_face_t *face)
 {
-  char output_path[255];
-  sprintf (output_path, "out/sbix-%d-%d.png", group, gid);
-  FILE *f = fopen (output_path, "wb");
-  unsigned int length;
-  const char* data = hb_blob_get_data (blob, &length);
-  fwrite (data, 1, length, f);
-  fclose (f);
+  OT::sbix::accelerator_t sbix;
+  sbix.init (face);
+  unsigned int length = 0;
+  unsigned int *available_ppems = sbix.get_available_ppems (&length);
+  unsigned int num_glyphs = face->num_glyphs;
+  for (unsigned int group = 0; group < length; group++)
+    for (unsigned int glyph_id = 0; glyph_id < num_glyphs; glyph_id++)
+    {
+      hb_blob_t *blob;
+      blob = sbix.reference_blob_for_glyph (glyph_id, 0, available_ppems[group],
+					    HB_TAG('p','n','g',' '), NULL, NULL);
+      if (hb_blob_get_length (blob) == 0) continue;
+
+      char output_path[255];
+      sprintf (output_path, "out/sbix-%d-%d.png", available_ppems[group], glyph_id);
+      FILE *f = fopen (output_path, "wb");
+      unsigned int length;
+      const char* data = hb_blob_get_data (blob, &length);
+      fwrite (data, 1, length, f);
+      fclose (f);
+    }
+  sbix.fini ();
 }
 
 static void
@@ -273,10 +288,7 @@ main (int argc, char **argv)
   cbdt.dump (cbdt_callback);
   cbdt.fini ();
 
-  OT::sbix::accelerator_t sbix;
-  sbix.init (face);
-  sbix.dump (sbix_callback);
-  sbix.fini ();
+  sbix_dump (face);
 
   if (hb_ot_color_has_svg (face))
     svg_dump (face);
diff --git a/src/hb-ot-color-sbix-table.hh b/src/hb-ot-color-sbix-table.hh
index cba62f0cf..b48ea1715 100644
--- a/src/hb-ot-color-sbix-table.hh
+++ b/src/hb-ot-color-sbix-table.hh
@@ -153,23 +153,17 @@ struct sbix
       hb_blob_destroy (sbix_blob);
     }
 
-    inline void dump (void (*callback) (hb_blob_t *data,
-					unsigned int group, unsigned int gid)) const
+    /* only to support dump-emoji, don't use it anywhere else */
+    inline unsigned int *get_available_ppems (unsigned int *length)
     {
-      for (unsigned group = 0; group < sbix_table->strikes.len; group++)
-      {
-	const SBIXStrike &strike = sbix_table+sbix_table->strikes[group];
-	for (unsigned int glyph_id = 0; glyph_id < num_glyphs; glyph_id++)
-	{
-	  hb_tag_t tag;
-	  hb_blob_t *blob;
-	  blob = strike.get_glyph_blob (glyph_id, sbix_blob, sbix_len,
-					sbix_table->strikes[group],
-					nullptr, nullptr,
-					HB_TAG('p','n','g',' '), num_glyphs);
-	  if (hb_blob_get_length (blob)) callback (blob, group, glyph_id);
-	}
-      }
+      if (unlikely (sbix_len == 0 || sbix_table->strikes.len == 0))
+	return nullptr;
+      *length = sbix_table->strikes.len;
+      unsigned int *result;
+      result = (unsigned int *) malloc (sizeof (unsigned int) * sbix_table->strikes.len);
+      for (unsigned int i = 0; i < sbix_table->strikes.len; i++)
+	result[i] = (sbix_table+sbix_table->strikes[i]).get_ppem ();
+      return result;
     }
 
     inline hb_blob_t *reference_blob_for_glyph (hb_codepoint_t  glyph_id,