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+/*
+ * Copyright © 2021 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.
+ *
+ */
+
+#ifndef HB_OT_POST_TABLE_V2SUBSET_HH
+#define HB_OT_POST_TABLE_V2SUBSET_HH
+
+#include "hb-open-type.hh"
+#include "hb-ot-post-table.hh"
+
+/*
+ * post -- PostScript
+ * https://docs.microsoft.com/en-us/typography/opentype/spec/post
+ */
+
+namespace OT {
+template<typename Iterator>
+HB_INTERNAL bool postV2Tail::serialize (hb_serialize_context_t *c,
+ Iterator it,
+ const void* _post) const
+{
+ TRACE_SERIALIZE (this);
+ auto *out = c->start_embed (this);
+ if (unlikely (!c->check_success (out))) return_trace (false);
+ if (!out->glyphNameIndex.serialize (c, + it
+ | hb_map (hb_second)))
+ return_trace (false);
+
+ hb_set_t copied_indices;
+ for (const auto& _ : + it )
+ {
+ unsigned glyph_id = _.first;
+ unsigned new_index = _.second;
+
+ if (new_index < 258) continue;
+ if (copied_indices.has (new_index)) continue;
+ copied_indices.add (new_index);
+
+ hb_bytes_t s = reinterpret_cast<const post::accelerator_t*> (_post)->find_glyph_name (glyph_id);
+ HBUINT8 *o = c->allocate_size<HBUINT8> (HBUINT8::static_size * (s.length + 1));
+ if (unlikely (!o)) return_trace (false);
+ if (!c->check_assign (o[0], s.length, HB_SERIALIZE_ERROR_INT_OVERFLOW)) return_trace (false);
+ hb_memcpy (o+1, s.arrayZ, HBUINT8::static_size * s.length);
+ }
+
+ return_trace (true);
+}
+
+HB_INTERNAL bool postV2Tail::subset (hb_subset_context_t *c) const
+{
+ TRACE_SUBSET (this);
+
+ const hb_map_t &reverse_glyph_map = *c->plan->reverse_glyph_map;
+ unsigned num_glyphs = c->plan->num_output_glyphs ();
+ hb_map_t old_new_index_map, old_gid_new_index_map;
+ unsigned i = 0;
+
+ post::accelerator_t _post (c->plan->source);
+
+ hb_hashmap_t<hb_bytes_t, uint32_t, true> glyph_name_to_new_index;
+
+ old_new_index_map.alloc (num_glyphs);
+ old_gid_new_index_map.alloc (num_glyphs);
+ glyph_name_to_new_index.alloc (num_glyphs);
+
+ for (hb_codepoint_t new_gid = 0; new_gid < num_glyphs; new_gid++)
+ {
+ hb_codepoint_t old_gid = reverse_glyph_map.get (new_gid);
+ unsigned old_index = glyphNameIndex[old_gid];
+
+ unsigned new_index;
+ const uint32_t *new_index2;
+ if (old_index <= 257)
+ new_index = old_index;
+ else if (old_new_index_map.has (old_index, &new_index2))
+ new_index = *new_index2;
+ else
+ {
+ hb_bytes_t s = _post.find_glyph_name (old_gid);
+ new_index = glyph_name_to_new_index.get (s);
+ if (new_index == (unsigned)-1)
+ {
+ int standard_glyph_index = -1;
+ for (unsigned i = 0; i < format1_names_length; i++)
+ {
+ if (s == format1_names (i))
+ {
+ standard_glyph_index = i;
+ break;
+ }
+ }
+
+ if (standard_glyph_index == -1)
+ {
+ new_index = 258 + i;
+ i++;
+ }
+ else
+ { new_index = standard_glyph_index; }
+ glyph_name_to_new_index.set (s, new_index);
+ }
+ old_new_index_map.set (old_index, new_index);
+ }
+ old_gid_new_index_map.set (old_gid, new_index);
+ }
+
+ auto index_iter =
+ + hb_range (num_glyphs)
+ | hb_map (reverse_glyph_map)
+ | hb_map_retains_sorting ([&](hb_codepoint_t old_gid)
+ {
+ unsigned new_index = old_gid_new_index_map.get (old_gid);
+ return hb_pair_t<unsigned, unsigned> (old_gid, new_index);
+ })
+ ;
+
+ return_trace (serialize (c->serializer, index_iter, &_post));
+}
+
+} /* namespace OT */
+#endif /* HB_OT_POST_TABLE_V2SUBSET_HH */