--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/harfbuzz/src/hb-ot-post-table-v2subset.hh	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,136 @@
+/*
+ * 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;
+  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 */