Merge remote-tracking branch 'upstream/master'
diff --git a/src/hb-ot-cmap-table.hh b/src/hb-ot-cmap-table.hh
index 34416a5..1e48c99 100644
--- a/src/hb-ot-cmap-table.hh
+++ b/src/hb-ot-cmap-table.hh
@@ -1207,10 +1207,9 @@
 		})
     ;
 
-
     if (unlikely (!encodingrec_iter.len ())) return_trace (false);
 
-    const EncodingRecord *unicode_bmp= nullptr, *unicode_ucs4 = nullptr, *ms_bmp = nullptr, *ms_ucs4 = nullptr;
+    const EncodingRecord *unicode_bmp= nullptr, *unicode_ucs4 = nullptr, *unicode_uvs = nullptr, *ms_bmp = nullptr, *ms_ucs4 = nullptr;
     bool has_format12 = false;
 
     for (const EncodingRecord& _ : encodingrec_iter)
@@ -1221,6 +1220,7 @@
       const EncodingRecord *table = hb_addressof (_);
       if      (_.platformID == 0 && _.encodingID ==  3) unicode_bmp = table;
       else if (_.platformID == 0 && _.encodingID ==  4) unicode_ucs4 = table;
+      else if (_.platformID == 0 && _.encodingID ==  5) unicode_uvs = table;
       else if (_.platformID == 3 && _.encodingID ==  1) ms_bmp = table;
       else if (_.platformID == 3 && _.encodingID == 10) ms_ucs4 = table;
     }
diff --git a/src/hb-ot-color-cbdt-table.hh b/src/hb-ot-color-cbdt-table.hh
index 01af6e5..de6be04 100644
--- a/src/hb-ot-color-cbdt-table.hh
+++ b/src/hb-ot-color-cbdt-table.hh
@@ -21,7 +21,7 @@
  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  *
- * Google Author(s): Seigo Nonaka
+ * Google Author(s): Seigo Nonaka, Calder Kitagawa
  */
 
 #ifndef HB_OT_COLOR_CBDT_TABLE_HH
@@ -43,6 +43,35 @@
 
 namespace OT {
 
+struct cblc_bitmap_size_subset_context_t
+{
+  const char *cbdt;
+  unsigned int cbdt_length;
+  hb_vector_t<char> *cbdt_prime;
+  unsigned int size;		/* INOUT
+				 *  Input: old size of IndexSubtable
+				 *  Output: new size of IndexSubtable
+				 */
+  unsigned int num_tables;	/* INOUT
+				 *  Input: old number of subtables.
+				 *  Output: new number of subtables.
+				 */
+  hb_codepoint_t start_glyph;	/* OUT */
+  hb_codepoint_t end_glyph;	/* OUT */
+};
+
+static inline bool
+_copy_data_to_cbdt (hb_vector_t<char> *cbdt_prime,
+		    const void        *data,
+		    unsigned           length)
+{
+  unsigned int new_len = cbdt_prime->length + length;
+  if (unlikely (!cbdt_prime->alloc (new_len))) return false;
+  memcpy (cbdt_prime->arrayZ + cbdt_prime->length, data, length);
+  cbdt_prime->length = new_len;
+  return true;
+}
+
 struct SmallGlyphMetrics
 {
   bool sanitize (hb_sanitize_context_t *c) const
@@ -65,7 +94,7 @@
   HBINT8	bearingY;
   HBUINT8	advance;
   public:
-  DEFINE_SIZE_STATIC(5);
+  DEFINE_SIZE_STATIC (5);
 };
 
 struct BigGlyphMetrics : SmallGlyphMetrics
@@ -74,7 +103,7 @@
   HBINT8	vertBearingY;
   HBUINT8	vertAdvance;
   public:
-  DEFINE_SIZE_STATIC(8);
+  DEFINE_SIZE_STATIC (8);
 };
 
 struct SBitLineMetrics
@@ -98,7 +127,7 @@
   HBINT8	padding1;
   HBINT8	padding2;
   public:
-  DEFINE_SIZE_STATIC(12);
+  DEFINE_SIZE_STATIC (12);
 };
 
 
@@ -118,7 +147,7 @@
   HBUINT16	imageFormat;
   HBUINT32	imageDataOffset;
   public:
-  DEFINE_SIZE_STATIC(8);
+  DEFINE_SIZE_STATIC (8);
 };
 
 template <typename OffsetType>
@@ -143,11 +172,23 @@
     return true;
   }
 
+  bool add_offset (hb_serialize_context_t *c,
+		   unsigned int offset,
+		   unsigned int *size /* OUT (accumulated) */)
+  {
+    TRACE_SERIALIZE (this);
+    Offset<OffsetType> embedded_offset;
+    embedded_offset = offset;
+    *size += sizeof (OffsetType);
+    auto *o = c->embed (embedded_offset);
+    return_trace ((bool) o);
+  }
+
   IndexSubtableHeader	header;
   UnsizedArrayOf<Offset<OffsetType>>
 			offsetArrayZ;
   public:
-  DEFINE_SIZE_ARRAY(8, offsetArrayZ);
+  DEFINE_SIZE_ARRAY (8, offsetArrayZ);
 };
 
 struct IndexSubtableFormat1 : IndexSubtableFormat1Or3<HBUINT32> {};
@@ -159,35 +200,153 @@
   {
     TRACE_SANITIZE (this);
     if (!u.header.sanitize (c)) return_trace (false);
-    switch (u.header.indexFormat) {
+    switch (u.header.indexFormat)
+    {
     case 1: return_trace (u.format1.sanitize (c, glyph_count));
     case 3: return_trace (u.format3.sanitize (c, glyph_count));
     default:return_trace (true);
     }
   }
 
+  bool
+  finish_subtable (hb_serialize_context_t *c,
+		   unsigned int cbdt_prime_len,
+		   unsigned int num_glyphs,
+		   unsigned int *size /* OUT (accumulated) */)
+  {
+    TRACE_SERIALIZE (this);
+
+    unsigned int local_offset = cbdt_prime_len - u.header.imageDataOffset;
+    switch (u.header.indexFormat)
+    {
+    case 1: return_trace (u.format1.add_offset (c, local_offset, size));
+    case 3: {
+      if (!u.format3.add_offset (c, local_offset, size))
+	return_trace (false);
+      if (!(num_glyphs & 0x01))  // Pad to 32-bit alignment if needed.
+	return_trace (u.format3.add_offset (c, 0, size));
+      return_trace (true);
+    }
+    // TODO: implement 2, 4, 5.
+    case 2: case 4:  // No-op.
+    case 5:  // Pad to 32-bit aligned.
+    default: return_trace (false);
+    }
+  }
+
+  bool
+  fill_missing_glyphs (hb_serialize_context_t *c,
+		       unsigned int cbdt_prime_len,
+		       unsigned int num_missing,
+		       unsigned int *size /* OUT (accumulated) */,
+		       unsigned int *num_glyphs /* OUT (accumulated) */)
+  {
+    TRACE_SERIALIZE (this);
+
+    unsigned int local_offset = cbdt_prime_len - u.header.imageDataOffset;
+    switch (u.header.indexFormat)
+    {
+    case 1: {
+      for (unsigned int i = 0; i < num_missing; i++)
+      {
+	if (unlikely (!u.format1.add_offset (c, local_offset, size)))
+	  return_trace (false);
+	*num_glyphs += 1;
+      }
+      return_trace (true);
+    }
+    case 3: {
+      for (unsigned int i = 0; i < num_missing; i++)
+      {
+	if (unlikely (!u.format3.add_offset (c, local_offset, size)))
+	  return_trace (false);
+	*num_glyphs += 1;
+      }
+      return_trace (true);
+    }
+    // TODO: implement 2, 4, 5.
+    case 2:  // Add empty space in cbdt_prime?.
+    case 4: case 5:  // No-op as sparse is supported.
+    default: return_trace (false);
+    }
+  }
+
+  bool
+  copy_glyph_at_idx (hb_serialize_context_t *c, unsigned int idx,
+		     const char *cbdt, unsigned int cbdt_length,
+		     hb_vector_t<char> *cbdt_prime /* INOUT */,
+		     IndexSubtable *subtable_prime /* INOUT */,
+		     unsigned int *size /* OUT (accumulated) */) const
+  {
+    TRACE_SERIALIZE (this);
+
+    unsigned int offset, length, format;
+    if (unlikely (!get_image_data (idx, &offset, &length, &format))) return_trace (false);
+    if (unlikely (offset > cbdt_length || cbdt_length - offset < length)) return_trace (false);
+
+    auto *header_prime = subtable_prime->get_header ();
+    unsigned int new_local_offset = cbdt_prime->length - (unsigned int) header_prime->imageDataOffset;
+    if (unlikely (!_copy_data_to_cbdt (cbdt_prime, cbdt + offset, length))) return_trace (false);
+
+    return_trace (subtable_prime->add_offset (c, new_local_offset, size));
+  }
+
+  bool
+  add_offset (hb_serialize_context_t *c, unsigned int local_offset,
+	      unsigned int *size /* OUT (accumulated) */)
+  {
+    TRACE_SERIALIZE (this);
+    switch (u.header.indexFormat)
+    {
+    case 1: return_trace (u.format1.add_offset (c, local_offset, size));
+    case 3: return_trace (u.format3.add_offset (c, local_offset, size));
+    // TODO: Implement tables 2, 4, 5
+    case 2:  // Should be a no-op.
+    case 4: case 5:  // Handle sparse cases.
+    default: return_trace (false);
+    }
+  }
+
   bool get_extents (hb_glyph_extents_t *extents HB_UNUSED) const
   {
-    switch (u.header.indexFormat) {
+    switch (u.header.indexFormat)
+    {
     case 2: case 5: /* TODO */
     case 1: case 3: case 4: /* Variable-metrics formats do not have metrics here. */
     default:return (false);
     }
   }
 
-  bool get_image_data (unsigned int idx,
-		       unsigned int *offset,
-		       unsigned int *length,
-		       unsigned int *format) const
+  bool
+  get_image_data (unsigned int idx, unsigned int *offset,
+		  unsigned int *length, unsigned int *format) const
   {
     *format = u.header.imageFormat;
-    switch (u.header.indexFormat) {
+    switch (u.header.indexFormat)
+    {
     case 1: return u.format1.get_image_data (idx, offset, length);
     case 3: return u.format3.get_image_data (idx, offset, length);
     default: return false;
     }
   }
 
+  const IndexSubtableHeader* get_header () const { return &u.header; }
+
+  void populate_header (unsigned index_format,
+			unsigned image_format,
+			unsigned int image_data_offset,
+			unsigned int *size)
+  {
+    u.header.indexFormat = index_format;
+    u.header.imageFormat = image_format;
+    u.header.imageDataOffset = image_data_offset;
+    switch (u.header.indexFormat)
+    {
+    case 1: *size += IndexSubtableFormat1::min_size; break;
+    case 3: *size += IndexSubtableFormat3::min_size; break;
+    }
+  }
+
   protected:
   union {
   IndexSubtableHeader	header;
@@ -209,12 +368,133 @@
 		  offsetToSubtable.sanitize (c, base, lastGlyphIndex - firstGlyphIndex + 1));
   }
 
-  bool get_extents (hb_glyph_extents_t *extents,
-		    const void *base) const
+  const IndexSubtable* get_subtable (const void *base) const
   {
-    return (base+offsetToSubtable).get_extents (extents);
+    return &(base+offsetToSubtable);
   }
 
+  bool add_new_subtable (hb_subset_context_t* c,
+			 cblc_bitmap_size_subset_context_t *bitmap_size_context,
+			 IndexSubtableRecord *record,
+			 const hb_vector_t<hb_pair_t<hb_codepoint_t, const IndexSubtableRecord*>> *lookup, /* IN */
+			 const void *base,
+			 unsigned int *start /* INOUT */) const
+  {
+    TRACE_SERIALIZE (this);
+
+    auto *subtable = c->serializer->start_embed<IndexSubtable> ();
+    if (unlikely (!subtable)) return_trace (false);
+    if (unlikely (!c->serializer->extend_min (subtable))) return_trace (false);
+
+    auto *old_subtable = get_subtable (base);
+    auto *old_header = old_subtable->get_header ();
+
+    subtable->populate_header (old_header->indexFormat,
+			       old_header->imageFormat,
+			       bitmap_size_context->cbdt_prime->length,
+			       &bitmap_size_context->size);
+
+    unsigned int num_glyphs = 0;
+    bool early_exit = false;
+    for (unsigned int i = *start; i < lookup->length; i++)
+    {
+      hb_codepoint_t new_gid = (*lookup)[i].first;
+      const IndexSubtableRecord *next_record = (*lookup)[i].second;
+      const IndexSubtable *next_subtable = next_record->get_subtable (base);
+      auto *next_header = next_subtable->get_header ();
+      if (next_header != old_header)
+      {
+	*start = i;
+	early_exit = true;
+	break;
+      }
+      unsigned int num_missing = record->add_glyph_for_subset (new_gid);
+      if (unlikely (!subtable->fill_missing_glyphs (c->serializer,
+						    bitmap_size_context->cbdt_prime->length,
+						    num_missing,
+						    &bitmap_size_context->size,
+						    &num_glyphs)))
+	return_trace (false);
+
+      hb_codepoint_t old_gid = 0;
+      c->plan->old_gid_for_new_gid (new_gid, &old_gid);
+      if (old_gid < next_record->firstGlyphIndex)
+	return_trace (false);
+
+      unsigned int old_idx = (unsigned int) old_gid - next_record->firstGlyphIndex;
+      if (unlikely (!next_subtable->copy_glyph_at_idx (c->serializer,
+						       old_idx,
+						       bitmap_size_context->cbdt,
+						       bitmap_size_context->cbdt_length,
+						       bitmap_size_context->cbdt_prime,
+						       subtable,
+						       &bitmap_size_context->size)))
+	return_trace (false);
+      num_glyphs += 1;
+    }
+    if (!early_exit)
+      *start = lookup->length;
+    if (unlikely (!subtable->finish_subtable (c->serializer,
+					      bitmap_size_context->cbdt_prime->length,
+					      num_glyphs,
+					      &bitmap_size_context->size)))
+      return_trace (false);
+    return_trace (true);
+  }
+
+  bool add_new_record (hb_subset_context_t *c,
+		       cblc_bitmap_size_subset_context_t *bitmap_size_context,
+		       const hb_vector_t<hb_pair_t<hb_codepoint_t, const IndexSubtableRecord*>> *lookup, /* IN */
+		       const void *base,
+		       unsigned int *start, /* INOUT */
+		       hb_vector_t<IndexSubtableRecord>* records /* INOUT */) const
+  {
+    TRACE_SERIALIZE (this);
+    auto snap = c->serializer->snapshot ();
+    unsigned int old_size = bitmap_size_context->size;
+    unsigned int old_cbdt_prime_length = bitmap_size_context->cbdt_prime->length;
+
+    // Set to invalid state to indicate filling glyphs is not yet started.
+    records->resize (records->length + 1);
+    (*records)[records->length - 1].firstGlyphIndex = 1;
+    (*records)[records->length - 1].lastGlyphIndex = 0;
+    bitmap_size_context->size += IndexSubtableRecord::min_size;
+
+    c->serializer->push ();
+
+    if (unlikely (!add_new_subtable (c, bitmap_size_context, &((*records)[records->length - 1]), lookup, base, start)))
+    {
+      c->serializer->pop_discard ();
+      c->serializer->revert (snap);
+      bitmap_size_context->cbdt_prime->shrink (old_cbdt_prime_length);
+      bitmap_size_context->size = old_size;
+      records->resize (records->length - 1);
+      return_trace (false);
+    }
+
+    bitmap_size_context->num_tables += 1;
+    return_trace (true);
+  }
+
+  unsigned int add_glyph_for_subset (hb_codepoint_t gid)
+  {
+    if (firstGlyphIndex > lastGlyphIndex)
+    {
+      firstGlyphIndex = gid;
+      lastGlyphIndex = gid;
+      return 0;
+    }
+    // TODO maybe assert? this shouldn't occur.
+    if (lastGlyphIndex > gid)
+      return 0;
+    unsigned int num_missing = (unsigned int) (gid - lastGlyphIndex - 1);
+    lastGlyphIndex = gid;
+    return num_missing;
+  }
+
+  bool get_extents (hb_glyph_extents_t *extents, const void *base) const
+  { return (base+offsetToSubtable).get_extents (extents); }
+
   bool get_image_data (unsigned int  gid,
 		       const void   *base,
 		       unsigned int *offset,
@@ -230,7 +510,7 @@
   HBGlyphID			lastGlyphIndex;
   LOffsetTo<IndexSubtable>	offsetToSubtable;
   public:
-  DEFINE_SIZE_STATIC(8);
+  DEFINE_SIZE_STATIC (8);
 };
 
 struct IndexSubtableArray
@@ -243,6 +523,72 @@
     return_trace (indexSubtablesZ.sanitize (c, count, this));
   }
 
+  void
+  build_lookup (hb_subset_context_t *c, cblc_bitmap_size_subset_context_t *bitmap_size_context,
+		hb_vector_t<hb_pair_t<hb_codepoint_t,
+		const IndexSubtableRecord*>> *lookup /* OUT */) const
+  {
+    bool start_glyph_is_set = false;
+    for (hb_codepoint_t new_gid = 0; new_gid < c->plan->num_output_glyphs (); new_gid++)
+    {
+      hb_codepoint_t old_gid;
+      if (unlikely (!c->plan->old_gid_for_new_gid (new_gid, &old_gid))) continue;
+
+      const IndexSubtableRecord* record = find_table (old_gid, bitmap_size_context->num_tables);
+      if (unlikely (!record)) continue;
+
+      // Don't add gaps to the lookup. The best way to determine if a glyph is a
+      // gap is that it has no image data.
+      unsigned int offset, length, format;
+      if (unlikely (!record->get_image_data (old_gid, this, &offset, &length, &format))) continue;
+
+      lookup->push (hb_pair_t<hb_codepoint_t, const IndexSubtableRecord*> (new_gid, record));
+
+      if (!start_glyph_is_set)
+      {
+	bitmap_size_context->start_glyph = new_gid;
+	start_glyph_is_set = true;
+      }
+
+      bitmap_size_context->end_glyph = new_gid;
+    }
+  }
+
+  bool
+  subset (hb_subset_context_t *c,
+	  cblc_bitmap_size_subset_context_t *bitmap_size_context) const
+  {
+    TRACE_SUBSET (this);
+
+    auto *dst = c->serializer->start_embed<IndexSubtableArray> ();
+    if (unlikely (!dst)) return_trace (false);
+
+    hb_vector_t<hb_pair_t<hb_codepoint_t, const IndexSubtableRecord*>> lookup;
+    build_lookup (c, bitmap_size_context, &lookup);
+
+    bitmap_size_context->size = 0;
+    bitmap_size_context->num_tables = 0;
+    hb_vector_t<IndexSubtableRecord> records;
+    for (unsigned int start = 0; start < lookup.length;)
+    {
+      if (unlikely (!lookup[start].second->add_new_record (c, bitmap_size_context, &lookup, this, &start, &records)))
+	return_trace (false);
+    }
+
+    // Workaround to ensure offset ordering is from least to greatest when
+    // resolving links.
+    hb_vector_t<hb_serialize_context_t::objidx_t> objidxs;
+    for (unsigned int i = 0; i < records.length; i++)
+      objidxs.push (c->serializer->pop_pack ());
+    for (unsigned int i = 0; i < records.length; i++)
+    {
+      IndexSubtableRecord* record = c->serializer->embed (records[i]);
+      if (unlikely (!record)) return_trace (false);
+      c->serializer->add_link (record->offsetToSubtable, objidxs[records.length - 1 - i], dst);
+    }
+    return_trace (true);
+  }
+
   public:
   const IndexSubtableRecord* find_table (hb_codepoint_t glyph, unsigned int numTables) const
   {
@@ -274,14 +620,49 @@
 		  vertical.sanitize (c));
   }
 
-  const IndexSubtableRecord *find_table (hb_codepoint_t glyph,
-					 const void *base,
-					 const void **out_base) const
+  const IndexSubtableRecord *
+  find_table (hb_codepoint_t glyph, const void *base, const void **out_base) const
   {
     *out_base = &(base+indexSubtableArrayOffset);
     return (base+indexSubtableArrayOffset).find_table (glyph, numberOfIndexSubtables);
   }
 
+  bool
+  subset (hb_subset_context_t *c, const void *src_base, const void *dst_base,
+	  const char *cbdt, unsigned int cbdt_length,
+	  hb_vector_t<char> *cbdt_prime /* INOUT */) const
+  {
+    TRACE_SUBSET (this);
+    auto *out_table = c->serializer->embed (this);
+    if (unlikely (!out_table)) return_trace (false);
+
+    cblc_bitmap_size_subset_context_t bitmap_size_context;
+    bitmap_size_context.cbdt = cbdt;
+    bitmap_size_context.cbdt_length = cbdt_length;
+    bitmap_size_context.cbdt_prime = cbdt_prime;
+    bitmap_size_context.size = indexTablesSize;
+    bitmap_size_context.num_tables = numberOfIndexSubtables;
+    bitmap_size_context.start_glyph = 1;
+    bitmap_size_context.end_glyph = 0;
+
+    if (!out_table->indexSubtableArrayOffset.serialize_subset (c,
+							       indexSubtableArrayOffset,
+							       src_base,
+							       dst_base,
+							       &bitmap_size_context))
+      return_trace (false);
+    if (!bitmap_size_context.size ||
+	!bitmap_size_context.num_tables ||
+	bitmap_size_context.start_glyph > bitmap_size_context.end_glyph)
+      return_trace (false);
+
+    out_table->indexTablesSize = bitmap_size_context.size;
+    out_table->numberOfIndexSubtables = bitmap_size_context.num_tables;
+    out_table->startGlyphIndex = bitmap_size_context.start_glyph;
+    out_table->endGlyphIndex = bitmap_size_context.end_glyph;
+    return_trace (true);
+  }
+
   protected:
   LNNOffsetTo<IndexSubtableArray>
 			indexSubtableArrayOffset;
@@ -297,7 +678,7 @@
   HBUINT8		bitDepth;
   HBINT8		flags;
   public:
-  DEFINE_SIZE_STATIC(48);
+  DEFINE_SIZE_STATIC (48);
 };
 
 
@@ -310,7 +691,7 @@
   SmallGlyphMetrics	glyphMetrics;
   LArrayOf<HBUINT8>	data;
   public:
-  DEFINE_SIZE_ARRAY(9, data);
+  DEFINE_SIZE_ARRAY (9, data);
 };
 
 struct GlyphBitmapDataFormat18
@@ -318,14 +699,14 @@
   BigGlyphMetrics	glyphMetrics;
   LArrayOf<HBUINT8>	data;
   public:
-  DEFINE_SIZE_ARRAY(12, data);
+  DEFINE_SIZE_ARRAY (12, data);
 };
 
 struct GlyphBitmapDataFormat19
 {
   LArrayOf<HBUINT8>	data;
   public:
-  DEFINE_SIZE_ARRAY(4, data);
+  DEFINE_SIZE_ARRAY (4, data);
 };
 
 struct CBLC
@@ -342,12 +723,50 @@
 		  sizeTables.sanitize (c, this));
   }
 
+  static bool
+  sink_cbdt (hb_subset_context_t *c, hb_vector_t<char>* cbdt_prime)
+  {
+    hb_blob_t *cbdt_prime_blob = hb_blob_create (cbdt_prime->arrayZ,
+						 cbdt_prime->length,
+						 HB_MEMORY_MODE_WRITABLE,
+						 cbdt_prime->arrayZ,
+						 free);
+    cbdt_prime->init ();  // Leak arrayZ to the blob.
+    bool ret = c->plan->add_table (HB_OT_TAG_CBDT, cbdt_prime_blob);
+    hb_blob_destroy (cbdt_prime_blob);
+    return ret;
+  }
+
+  bool
+  subset_size_table (hb_subset_context_t *c, const BitmapSizeTable& table,
+		     const char *cbdt /* IN */, unsigned int cbdt_length,
+		     CBLC *cblc_prime /* INOUT */, hb_vector_t<char> *cbdt_prime /* INOUT */) const
+  {
+    TRACE_SUBSET (this);
+    cblc_prime->sizeTables.len++;
+
+    auto snap = c->serializer->snapshot ();
+    auto cbdt_prime_len = cbdt_prime->length;
+
+    if (!table.subset (c, this, cblc_prime, cbdt, cbdt_length, cbdt_prime))
+    {
+      cblc_prime->sizeTables.len--;
+      c->serializer->revert (snap);
+      cbdt_prime->shrink (cbdt_prime_len);
+      return_trace (false);
+    }
+    return_trace (true);
+  }
+
+  // Implemented in cc file as it depends on definition of CBDT.
+  HB_INTERNAL bool subset (hb_subset_context_t *c) const;
+
   protected:
   const BitmapSizeTable &choose_strike (hb_font_t *font) const
   {
     unsigned count = sizeTables.len;
     if (unlikely (!count))
-      return Null(BitmapSizeTable);
+      return Null (BitmapSizeTable);
 
     unsigned int requested_ppem = hb_max (font->x_ppem, font->y_ppem);
     if (!requested_ppem)
@@ -373,7 +792,7 @@
   FixedVersion<>		version;
   LArrayOf<BitmapSizeTable>	sizeTables;
   public:
-  DEFINE_SIZE_ARRAY(8, sizeTables);
+  DEFINE_SIZE_ARRAY (8, sizeTables);
 };
 
 struct CBDT
@@ -384,8 +803,8 @@
   {
     void init (hb_face_t *face)
     {
-      cblc = hb_sanitize_context_t().reference_table<CBLC> (face);
-      cbdt = hb_sanitize_context_t().reference_table<CBDT> (face);
+      cblc = hb_sanitize_context_t ().reference_table<CBLC> (face);
+      cbdt = hb_sanitize_context_t ().reference_table<CBDT> (face);
 
       upem = hb_face_get_upem (face);
     }
@@ -396,8 +815,8 @@
       this->cbdt.destroy ();
     }
 
-    bool get_extents (hb_font_t *font, hb_codepoint_t glyph,
-		      hb_glyph_extents_t *extents) const
+    bool
+    get_extents (hb_font_t *font, hb_codepoint_t glyph, hb_glyph_extents_t *extents) const
     {
       const void *base;
       const BitmapSizeTable &strike = this->cblc->choose_strike (font);
@@ -412,33 +831,27 @@
       if (!subtable_record->get_image_data (glyph, base, &image_offset, &image_length, &image_format))
 	return false;
 
-      {
-	unsigned int cbdt_len = cbdt.get_length ();
-	if (unlikely (image_offset > cbdt_len || cbdt_len - image_offset < image_length))
-	  return false;
+      unsigned int cbdt_len = cbdt.get_length ();
+      if (unlikely (image_offset > cbdt_len || cbdt_len - image_offset < image_length))
+	return false;
 
-	switch (image_format)
-	{
-	  case 17: {
-	    if (unlikely (image_length < GlyphBitmapDataFormat17::min_size))
-	      return false;
-	    const GlyphBitmapDataFormat17& glyphFormat17 =
-		StructAtOffset<GlyphBitmapDataFormat17> (this->cbdt, image_offset);
-	    glyphFormat17.glyphMetrics.get_extents (font, extents);
-	    break;
-	  }
-	  case 18: {
-	    if (unlikely (image_length < GlyphBitmapDataFormat18::min_size))
-	      return false;
-	    const GlyphBitmapDataFormat18& glyphFormat18 =
-		StructAtOffset<GlyphBitmapDataFormat18> (this->cbdt, image_offset);
-	    glyphFormat18.glyphMetrics.get_extents (font, extents);
-	    break;
-	  }
-	  default:
-	    // TODO: Support other image formats.
-	    return false;
-	}
+      switch (image_format)
+      {
+      case 17: {
+	if (unlikely (image_length < GlyphBitmapDataFormat17::min_size))
+	  return false;
+	auto &glyphFormat17 = StructAtOffset<GlyphBitmapDataFormat17> (this->cbdt, image_offset);
+	glyphFormat17.glyphMetrics.get_extents (font, extents);
+	break;
+      }
+      case 18: {
+	if (unlikely (image_length < GlyphBitmapDataFormat18::min_size))
+	  return false;
+	auto &glyphFormat18 = StructAtOffset<GlyphBitmapDataFormat18> (this->cbdt, image_offset);
+	glyphFormat18.glyphMetrics.get_extents (font, extents);
+	break;
+      }
+      default: return false; /* TODO: Support other image formats. */
       }
 
       /* Convert to font units. */
@@ -452,8 +865,8 @@
       return true;
     }
 
-    hb_blob_t* reference_png (hb_font_t      *font,
-			      hb_codepoint_t  glyph) const
+    hb_blob_t*
+    reference_png (hb_font_t *font, hb_codepoint_t glyph) const
     {
       const void *base;
       const BitmapSizeTable &strike = this->cblc->choose_strike (font);
@@ -465,44 +878,41 @@
       if (!subtable_record->get_image_data (glyph, base, &image_offset, &image_length, &image_format))
 	return hb_blob_get_empty ();
 
+      unsigned int cbdt_len = cbdt.get_length ();
+      if (unlikely (image_offset > cbdt_len || cbdt_len - image_offset < image_length))
+	return hb_blob_get_empty ();
+
+      switch (image_format)
       {
-	unsigned int cbdt_len = cbdt.get_length ();
-	if (unlikely (image_offset > cbdt_len || cbdt_len - image_offset < image_length))
+      case 17:
+      {
+	if (unlikely (image_length < GlyphBitmapDataFormat17::min_size))
 	  return hb_blob_get_empty ();
-
-	switch (image_format)
-	{
-	  case 17: {
-	    if (unlikely (image_length < GlyphBitmapDataFormat17::min_size))
-	      return hb_blob_get_empty ();
-	    const GlyphBitmapDataFormat17& glyphFormat17 =
-	      StructAtOffset<GlyphBitmapDataFormat17> (this->cbdt, image_offset);
-	    return hb_blob_create_sub_blob (cbdt.get_blob (),
-					    image_offset + GlyphBitmapDataFormat17::min_size,
-					    glyphFormat17.data.len);
-	  }
-	  case 18: {
-	    if (unlikely (image_length < GlyphBitmapDataFormat18::min_size))
-	      return hb_blob_get_empty ();
-	    const GlyphBitmapDataFormat18& glyphFormat18 =
-	      StructAtOffset<GlyphBitmapDataFormat18> (this->cbdt, image_offset);
-	    return hb_blob_create_sub_blob (cbdt.get_blob (),
-					    image_offset + GlyphBitmapDataFormat18::min_size,
-					    glyphFormat18.data.len);
-	  }
-	  case 19: {
-	    if (unlikely (image_length < GlyphBitmapDataFormat19::min_size))
-	      return hb_blob_get_empty ();
-	    const GlyphBitmapDataFormat19& glyphFormat19 =
-	      StructAtOffset<GlyphBitmapDataFormat19> (this->cbdt, image_offset);
-	    return hb_blob_create_sub_blob (cbdt.get_blob (),
-					    image_offset + GlyphBitmapDataFormat19::min_size,
-					    glyphFormat19.data.len);
-	  }
-	}
+	auto &glyphFormat17 = StructAtOffset<GlyphBitmapDataFormat17> (this->cbdt, image_offset);
+	return hb_blob_create_sub_blob (cbdt.get_blob (),
+					image_offset + GlyphBitmapDataFormat17::min_size,
+					glyphFormat17.data.len);
       }
-
-      return hb_blob_get_empty ();
+      case 18:
+      {
+	if (unlikely (image_length < GlyphBitmapDataFormat18::min_size))
+	  return hb_blob_get_empty ();
+	auto &glyphFormat18 = StructAtOffset<GlyphBitmapDataFormat18> (this->cbdt, image_offset);
+	return hb_blob_create_sub_blob (cbdt.get_blob (),
+					image_offset + GlyphBitmapDataFormat18::min_size,
+					glyphFormat18.data.len);
+      }
+      case 19:
+      {
+	if (unlikely (image_length < GlyphBitmapDataFormat19::min_size))
+	  return hb_blob_get_empty ();
+	auto &glyphFormat19 = StructAtOffset<GlyphBitmapDataFormat19> (this->cbdt, image_offset);
+	return hb_blob_create_sub_blob (cbdt.get_blob (),
+					image_offset + GlyphBitmapDataFormat19::min_size,
+					glyphFormat19.data.len);
+      }
+      default: return hb_blob_get_empty (); /* TODO: Support other image formats. */
+      }
     }
 
     bool has_data () const { return cbdt.get_length (); }
@@ -525,9 +935,37 @@
   FixedVersion<>		version;
   UnsizedArrayOf<HBUINT8>	dataZ;
   public:
-  DEFINE_SIZE_ARRAY(4, dataZ);
+  DEFINE_SIZE_ARRAY (4, dataZ);
 };
 
+inline bool
+CBLC::subset (hb_subset_context_t *c) const
+{
+  TRACE_SUBSET (this);
+
+  auto *cblc_prime = c->serializer->start_embed<CBLC> ();
+
+  // Use a vector as a secondary buffer as the tables need to be built in parallel.
+  hb_vector_t<char> cbdt_prime;
+
+  if (unlikely (!cblc_prime)) return_trace (false);
+  if (unlikely (!c->serializer->extend_min (cblc_prime))) return_trace (false);
+  cblc_prime->version = version;
+
+  hb_blob_t* cbdt_blob = hb_sanitize_context_t ().reference_table<CBDT> (c->plan->source);
+  unsigned int cbdt_length;
+  CBDT* cbdt = (CBDT *) hb_blob_get_data (cbdt_blob, &cbdt_length);
+  if (unlikely (cbdt_length < CBDT::min_size)) return_trace (false);
+  _copy_data_to_cbdt (&cbdt_prime, cbdt, CBDT::min_size);
+
+  for (const BitmapSizeTable& table : + sizeTables.iter ())
+    subset_size_table (c, table, (const char *) cbdt, cbdt_length, cblc_prime, &cbdt_prime);
+
+  hb_blob_destroy (cbdt_blob);
+
+  return_trace (CBLC::sink_cbdt (c, &cbdt_prime));
+}
+
 struct CBDT_accelerator_t : CBDT::accelerator_t {};
 
 } /* namespace OT */
diff --git a/src/hb-subset.cc b/src/hb-subset.cc
index eb054dc..6bcc0b0 100644
--- a/src/hb-subset.cc
+++ b/src/hb-subset.cc
@@ -45,6 +45,7 @@
 #include "hb-ot-cff2-table.hh"
 #include "hb-ot-vorg-table.hh"
 #include "hb-ot-name-table.hh"
+#include "hb-ot-color-cbdt-table.hh"
 #include "hb-ot-layout-gsub-table.hh"
 #include "hb-ot-layout-gpos-table.hh"
 #include "hb-ot-var-gvar-table.hh"
@@ -201,6 +202,8 @@
   case HB_OT_TAG_OS2 : return _subset<const OT::OS2 > (plan);
   case HB_OT_TAG_post: return _subset<const OT::post> (plan);
   case HB_OT_TAG_COLR: return _subset<const OT::COLR> (plan);
+  case HB_OT_TAG_CBLC: return _subset<const OT::CBLC> (plan);
+  case HB_OT_TAG_CBDT: return true; /* skip CBDT, handled by CBLC */
 
 #ifndef HB_NO_SUBSET_CFF
   case HB_OT_TAG_cff1: return _subset<const OT::cff1> (plan);
diff --git a/test/api/Makefile.am b/test/api/Makefile.am
index 96e5eea..6f0bba9 100644
--- a/test/api/Makefile.am
+++ b/test/api/Makefile.am
@@ -59,6 +59,7 @@
 	test-subset-sbix \
 	test-subset-gpos \
 	test-subset-colr \
+	test-subset-cbdt \
 	test-unicode \
 	test-version \
 	test-subset-nameids \
@@ -79,6 +80,7 @@
 test_subset_hvar_LDADD = $(LDADD) $(top_builddir)/src/libharfbuzz-subset.la
 test_subset_vvar_LDADD = $(LDADD) $(top_builddir)/src/libharfbuzz-subset.la
 test_subset_sbix_LDADD = $(LDADD) $(top_builddir)/src/libharfbuzz-subset.la
+test_subset_cbdt_LDADD = $(LDADD) $(top_builddir)/src/libharfbuzz-subset.la
 test_subset_nameids_LDADD = $(LDADD) $(top_builddir)/src/libharfbuzz-subset.la
 test_subset_gpos_LDADD = $(LDADD) $(top_builddir)/src/libharfbuzz-subset.la
 test_subset_colr_LDADD = $(LDADD) $(top_builddir)/src/libharfbuzz-subset.la
diff --git a/test/api/fonts/NotoColorEmoji.subset.default.2049.ttf b/test/api/fonts/NotoColorEmoji.subset.default.2049.ttf
new file mode 100644
index 0000000..b577752
--- /dev/null
+++ b/test/api/fonts/NotoColorEmoji.subset.default.2049.ttf
Binary files differ
diff --git a/test/api/fonts/NotoColorEmoji.subset.default.39.ttf b/test/api/fonts/NotoColorEmoji.subset.default.39.ttf
new file mode 100644
index 0000000..34e878e
--- /dev/null
+++ b/test/api/fonts/NotoColorEmoji.subset.default.39.ttf
Binary files differ
diff --git a/test/api/fonts/NotoColorEmoji.subset.index_format3.default.38,AE,2049.ttf b/test/api/fonts/NotoColorEmoji.subset.index_format3.default.38,AE,2049.ttf
new file mode 100644
index 0000000..e7f361a
--- /dev/null
+++ b/test/api/fonts/NotoColorEmoji.subset.index_format3.default.38,AE,2049.ttf
Binary files differ
diff --git a/test/api/fonts/NotoColorEmoji.subset.index_format3.ttf b/test/api/fonts/NotoColorEmoji.subset.index_format3.ttf
new file mode 100644
index 0000000..df1ff9b
--- /dev/null
+++ b/test/api/fonts/NotoColorEmoji.subset.index_format3.ttf
Binary files differ
diff --git a/test/api/fonts/NotoColorEmoji.subset.multiple_size_tables.default.38,AE,2049.ttf b/test/api/fonts/NotoColorEmoji.subset.multiple_size_tables.default.38,AE,2049.ttf
new file mode 100644
index 0000000..8d2fb18
--- /dev/null
+++ b/test/api/fonts/NotoColorEmoji.subset.multiple_size_tables.default.38,AE,2049.ttf
Binary files differ
diff --git a/test/api/fonts/NotoColorEmoji.subset.multiple_size_tables.ttf b/test/api/fonts/NotoColorEmoji.subset.multiple_size_tables.ttf
new file mode 100644
index 0000000..cdccded
--- /dev/null
+++ b/test/api/fonts/NotoColorEmoji.subset.multiple_size_tables.ttf
Binary files differ
diff --git a/test/api/fonts/NotoColorEmoji.subset.ttf b/test/api/fonts/NotoColorEmoji.subset.ttf
new file mode 100644
index 0000000..14a544a
--- /dev/null
+++ b/test/api/fonts/NotoColorEmoji.subset.ttf
Binary files differ
diff --git a/test/api/test-subset-cbdt.c b/test/api/test-subset-cbdt.c
new file mode 100644
index 0000000..dcc06e1
--- /dev/null
+++ b/test/api/test-subset-cbdt.c
@@ -0,0 +1,158 @@
+/*
+ * Copyright © 2020  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): Calder Kitagawa
+ */
+
+#include "hb-test.h"
+#include "hb-subset-test.h"
+
+/* Unit tests for CBDT/CBLC subsetting */
+
+static void
+test_subset_cbdt_noop (void)
+{
+  hb_face_t *face = hb_test_open_font_file ("fonts/NotoColorEmoji.subset.ttf");
+
+  hb_set_t *codepoints = hb_set_create ();
+  hb_face_t *face_subset;
+  hb_set_add (codepoints, 0x38);
+  hb_set_add (codepoints, 0x39);
+  hb_set_add (codepoints, 0xAE);
+  hb_set_add (codepoints, 0x2049);
+  hb_set_add (codepoints, 0x20E3);
+  face_subset = hb_subset_test_create_subset (face, hb_subset_test_create_input (codepoints));
+  hb_set_destroy (codepoints);
+
+  hb_subset_test_check (face, face_subset, HB_TAG ('C','B','L','C'));
+  hb_subset_test_check (face, face_subset, HB_TAG ('C','B','D','T'));
+
+  hb_face_destroy (face_subset);
+  hb_face_destroy (face);
+}
+
+static void
+test_subset_cbdt_keep_one (void)
+{
+  hb_face_t *face = hb_test_open_font_file ("fonts/NotoColorEmoji.subset.ttf");
+  hb_face_t *face_expected = hb_test_open_font_file ("fonts/NotoColorEmoji.subset.default.39.ttf");
+
+  hb_set_t *codepoints = hb_set_create ();
+  hb_face_t *face_subset;
+  hb_set_add (codepoints, 0x39);
+  face_subset = hb_subset_test_create_subset (face, hb_subset_test_create_input (codepoints));
+  hb_set_destroy (codepoints);
+
+  hb_subset_test_check (face_expected, face_subset, HB_TAG ('C','B','L','C'));
+  hb_subset_test_check (face_expected, face_subset, HB_TAG ('C','B','D','T'));
+
+  hb_face_destroy (face_subset);
+  hb_face_destroy (face_expected);
+  hb_face_destroy (face);
+}
+
+static void
+test_subset_cbdt_keep_one_last_subtable (void)
+{
+  hb_face_t *face = hb_test_open_font_file ("fonts/NotoColorEmoji.subset.ttf");
+  hb_face_t *face_expected = hb_test_open_font_file ("fonts/NotoColorEmoji.subset.default.2049.ttf");
+
+  hb_set_t *codepoints = hb_set_create ();
+  hb_face_t *face_subset;
+  hb_set_add (codepoints, 0x2049);
+  face_subset = hb_subset_test_create_subset (face, hb_subset_test_create_input (codepoints));
+  hb_set_destroy (codepoints);
+
+  hb_subset_test_check (face_expected, face_subset, HB_TAG ('C','B','L','C'));
+  hb_subset_test_check (face_expected, face_subset, HB_TAG ('C','B','D','T'));
+
+  hb_face_destroy (face_subset);
+  hb_face_destroy (face_expected);
+  hb_face_destroy (face);
+}
+
+static void
+test_subset_cbdt_keep_multiple_subtables (void)
+{
+  hb_face_t *face = hb_test_open_font_file ("fonts/NotoColorEmoji.subset.multiple_size_tables.ttf");
+  hb_face_t *face_expected = hb_test_open_font_file ("fonts/NotoColorEmoji.subset.multiple_size_tables.default.38,AE,2049.ttf");
+
+  hb_set_t *codepoints = hb_set_create ();
+  hb_face_t *face_subset;
+  hb_set_add (codepoints, 0x38);
+  hb_set_add (codepoints, 0xAE);
+  hb_set_add (codepoints, 0x2049);
+  face_subset = hb_subset_test_create_subset (face, hb_subset_test_create_input (codepoints));
+  hb_set_destroy (codepoints);
+
+  hb_subset_test_check (face_expected, face_subset, HB_TAG ('C','B','L','C'));
+  hb_subset_test_check (face_expected, face_subset, HB_TAG ('C','B','D','T'));
+
+  hb_face_destroy (face_subset);
+  hb_face_destroy (face_expected);
+  hb_face_destroy (face);
+}
+
+static void
+test_subset_cbdt_index_format_3 (void)
+{
+  hb_face_t *face = hb_test_open_font_file ("fonts/NotoColorEmoji.subset.index_format3.ttf");
+  hb_face_t *face_expected = hb_test_open_font_file ("fonts/NotoColorEmoji.subset.index_format3.default.38,AE,2049.ttf");
+
+  hb_set_t *codepoints = hb_set_create ();
+  hb_face_t *face_subset;
+  hb_set_add (codepoints, 0x38);
+  hb_set_add (codepoints, 0xAE);
+  hb_set_add (codepoints, 0x2049);
+  face_subset = hb_subset_test_create_subset (face, hb_subset_test_create_input (codepoints));
+  hb_set_destroy (codepoints);
+
+  hb_subset_test_check (face_expected, face_subset, HB_TAG ('C','B','L','C'));
+  hb_subset_test_check (face_expected, face_subset, HB_TAG ('C','B','D','T'));
+
+  hb_face_destroy (face_subset);
+  hb_face_destroy (face_expected);
+  hb_face_destroy (face);
+}
+
+// TODO: add support/tests for index formats 2,4,5 (image formats are treated as
+// opaque blobs when subsetting so don't need to be tested separately).
+// TODO: add a test that keeps no codepoints.
+
+int
+main (int argc, char **argv)
+{
+  hb_test_init (&argc, &argv);
+
+  hb_test_add (test_subset_cbdt_noop);
+  hb_test_add (test_subset_cbdt_keep_one);
+  hb_test_add (test_subset_cbdt_keep_one_last_subtable);
+  // The following use manually crafted expectation files as they are not
+  // binary compatible with FontTools.
+  hb_test_add (test_subset_cbdt_keep_multiple_subtables);
+  // Can use FontTools after https://github.com/fonttools/fonttools/issues/1817
+  // is resolved.
+  hb_test_add (test_subset_cbdt_index_format_3);
+
+  return hb_test_run();
+}
diff --git a/test/fuzzing/fonts/NotoColorEmoji.subset.index_format3.ttf b/test/fuzzing/fonts/NotoColorEmoji.subset.index_format3.ttf
new file mode 100644
index 0000000..df1ff9b
--- /dev/null
+++ b/test/fuzzing/fonts/NotoColorEmoji.subset.index_format3.ttf
Binary files differ
diff --git a/test/fuzzing/fonts/NotoColorEmoji.subset.multiple_size_tables.ttf b/test/fuzzing/fonts/NotoColorEmoji.subset.multiple_size_tables.ttf
new file mode 100644
index 0000000..cdccded
--- /dev/null
+++ b/test/fuzzing/fonts/NotoColorEmoji.subset.multiple_size_tables.ttf
Binary files differ
diff --git a/test/fuzzing/fonts/NotoColorEmoji.subset.ttf b/test/fuzzing/fonts/NotoColorEmoji.subset.ttf
new file mode 100644
index 0000000..14a544a
--- /dev/null
+++ b/test/fuzzing/fonts/NotoColorEmoji.subset.ttf
Binary files differ
diff --git a/test/subset/data/Makefile.am b/test/subset/data/Makefile.am
index 45c5bf8..4a5bb30 100644
--- a/test/subset/data/Makefile.am
+++ b/test/subset/data/Makefile.am
@@ -21,6 +21,7 @@
 	expected/cmap14 \
 	expected/sbix \
 	expected/colr \
+	expected/cbdt \
 	fonts \
 	profiles \
 	$(NULL)
diff --git a/test/subset/data/Makefile.sources b/test/subset/data/Makefile.sources
index b22a528..d642db8 100644
--- a/test/subset/data/Makefile.sources
+++ b/test/subset/data/Makefile.sources
@@ -13,6 +13,7 @@
 	tests/cmap14.tests \
 	tests/sbix.tests \
 	tests/colr.tests \
+	tests/cbdt.tests \
 	$(NULL)
 
 XFAIL_TESTS = \
diff --git a/test/subset/data/expected/cbdt/NotoColorEmoji.subset.default.2049.ttf b/test/subset/data/expected/cbdt/NotoColorEmoji.subset.default.2049.ttf
new file mode 100644
index 0000000..b577752
--- /dev/null
+++ b/test/subset/data/expected/cbdt/NotoColorEmoji.subset.default.2049.ttf
Binary files differ
diff --git a/test/subset/data/expected/cbdt/NotoColorEmoji.subset.default.38,2049.ttf b/test/subset/data/expected/cbdt/NotoColorEmoji.subset.default.38,2049.ttf
new file mode 100644
index 0000000..6f4814c
--- /dev/null
+++ b/test/subset/data/expected/cbdt/NotoColorEmoji.subset.default.38,2049.ttf
Binary files differ
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+++ b/test/subset/data/expected/cbdt/NotoColorEmoji.subset.retain-gids.2049.ttf
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diff --git a/test/subset/data/expected/cbdt/NotoColorEmoji.subset.retain-gids.38,2049.ttf b/test/subset/data/expected/cbdt/NotoColorEmoji.subset.retain-gids.38,2049.ttf
new file mode 100644
index 0000000..2f14cad
--- /dev/null
+++ b/test/subset/data/expected/cbdt/NotoColorEmoji.subset.retain-gids.38,2049.ttf
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diff --git a/test/subset/data/expected/cbdt/NotoColorEmoji.subset.retain-gids.38,20E3.ttf b/test/subset/data/expected/cbdt/NotoColorEmoji.subset.retain-gids.38,20E3.ttf
new file mode 100644
index 0000000..8e211fd
--- /dev/null
+++ b/test/subset/data/expected/cbdt/NotoColorEmoji.subset.retain-gids.38,20E3.ttf
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diff --git a/test/subset/data/expected/cbdt/NotoColorEmoji.subset.retain-gids.38,39,AE,2049,38,20E3.ttf b/test/subset/data/expected/cbdt/NotoColorEmoji.subset.retain-gids.38,39,AE,2049,38,20E3.ttf
new file mode 100644
index 0000000..14a544a
--- /dev/null
+++ b/test/subset/data/expected/cbdt/NotoColorEmoji.subset.retain-gids.38,39,AE,2049,38,20E3.ttf
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diff --git a/test/subset/data/expected/cbdt/NotoColorEmoji.subset.retain-gids.38,AE,2049.ttf b/test/subset/data/expected/cbdt/NotoColorEmoji.subset.retain-gids.38,AE,2049.ttf
new file mode 100644
index 0000000..06fbe73
--- /dev/null
+++ b/test/subset/data/expected/cbdt/NotoColorEmoji.subset.retain-gids.38,AE,2049.ttf
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diff --git a/test/subset/data/expected/cbdt/NotoColorEmoji.subset.retain-gids.39.ttf b/test/subset/data/expected/cbdt/NotoColorEmoji.subset.retain-gids.39.ttf
new file mode 100644
index 0000000..dc003fe
--- /dev/null
+++ b/test/subset/data/expected/cbdt/NotoColorEmoji.subset.retain-gids.39.ttf
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diff --git a/test/subset/data/expected/cbdt/NotoColorEmoji.subset.retain-gids.AE.ttf b/test/subset/data/expected/cbdt/NotoColorEmoji.subset.retain-gids.AE.ttf
new file mode 100644
index 0000000..c990eca
--- /dev/null
+++ b/test/subset/data/expected/cbdt/NotoColorEmoji.subset.retain-gids.AE.ttf
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diff --git a/test/subset/data/fonts/NotoColorEmoji.subset.gap.ttf b/test/subset/data/fonts/NotoColorEmoji.subset.gap.ttf
new file mode 100644
index 0000000..885059a
--- /dev/null
+++ b/test/subset/data/fonts/NotoColorEmoji.subset.gap.ttf
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diff --git a/test/subset/data/fonts/NotoColorEmoji.subset.index_format3.ttf b/test/subset/data/fonts/NotoColorEmoji.subset.index_format3.ttf
new file mode 100644
index 0000000..df1ff9b
--- /dev/null
+++ b/test/subset/data/fonts/NotoColorEmoji.subset.index_format3.ttf
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diff --git a/test/subset/data/fonts/NotoColorEmoji.subset.multiple_size_tables.ttf b/test/subset/data/fonts/NotoColorEmoji.subset.multiple_size_tables.ttf
new file mode 100644
index 0000000..cdccded
--- /dev/null
+++ b/test/subset/data/fonts/NotoColorEmoji.subset.multiple_size_tables.ttf
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diff --git a/test/subset/data/fonts/NotoColorEmoji.subset.ttf b/test/subset/data/fonts/NotoColorEmoji.subset.ttf
new file mode 100644
index 0000000..14a544a
--- /dev/null
+++ b/test/subset/data/fonts/NotoColorEmoji.subset.ttf
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diff --git a/test/subset/data/tests/cbdt.tests b/test/subset/data/tests/cbdt.tests
new file mode 100644
index 0000000..5e74fef
--- /dev/null
+++ b/test/subset/data/tests/cbdt.tests
@@ -0,0 +1,20 @@
+FONTS:
+NotoColorEmoji.subset.ttf
+NotoColorEmoji.subset.index_format3.ttf
+NotoColorEmoji.subset.multiple_size_tables.ttf
+NotoColorEmoji.subset.gap.ttf
+
+PROFILES:
+default.txt
+drop-hints.txt
+drop-hints-retain-gids.txt
+retain-gids.txt
+
+SUBSETS:
+89®⁉8⃣
+8®⁉
+8⁉

+9
+⁉
+8⃣