--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/harfbuzz/src/hb-shaper.cc	Mon Sep 15 11:44:09 2025 +0200
@@ -0,0 +1,102 @@
+/*
+ * Copyright © 2012  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): Behdad Esfahbod
+ */
+
+#include "hb.hh"
+#include "hb-shaper.hh"
+#include "hb-machinery.hh"
+
+
+static const hb_shaper_entry_t _hb_all_shapers[] = {
+#define HB_SHAPER_IMPLEMENT(name) {#name, _hb_##name##_shape},
+#include "hb-shaper-list.hh"
+#undef HB_SHAPER_IMPLEMENT
+};
+#ifndef HB_NO_SHAPER
+static_assert (0 != ARRAY_LENGTH_CONST (_hb_all_shapers), "No shaper enabled.");
+#endif
+
+static inline void free_static_shapers ();
+
+static struct hb_shapers_lazy_loader_t : hb_lazy_loader_t<hb_shaper_entry_t,
+							  hb_shapers_lazy_loader_t>
+{
+  static hb_shaper_entry_t *create ()
+  {
+    char *env = getenv ("HB_SHAPER_LIST");
+    if (!env || !*env)
+      return nullptr;
+
+    hb_shaper_entry_t *shapers = (hb_shaper_entry_t *) hb_calloc (1, sizeof (_hb_all_shapers));
+    if (unlikely (!shapers))
+      return nullptr;
+
+    hb_memcpy (shapers, _hb_all_shapers, sizeof (_hb_all_shapers));
+
+     /* Reorder shaper list to prefer requested shapers. */
+    unsigned int i = 0;
+    char *end, *p = env;
+    for (;;)
+    {
+      end = strchr (p, ',');
+      if (!end)
+	end = p + strlen (p);
+
+      for (unsigned int j = i; j < ARRAY_LENGTH_CONST (_hb_all_shapers); j++)
+	if (end - p == (int) strlen (shapers[j].name) &&
+	    0 == strncmp (shapers[j].name, p, end - p))
+	{
+	  /* Reorder this shaper to position i */
+	 struct hb_shaper_entry_t t = shapers[j];
+	 memmove (&shapers[i + 1], &shapers[i], sizeof (shapers[i]) * (j - i));
+	 shapers[i] = t;
+	 i++;
+	}
+
+      if (!*end)
+	break;
+      else
+	p = end + 1;
+    }
+
+    hb_atexit (free_static_shapers);
+
+    return shapers;
+  }
+  static void destroy (hb_shaper_entry_t *p) { hb_free (p); }
+  static const hb_shaper_entry_t *get_null ()      { return _hb_all_shapers; }
+} static_shapers;
+
+static inline
+void free_static_shapers ()
+{
+  static_shapers.free_instance ();
+}
+
+const hb_shaper_entry_t *
+_hb_shapers_get ()
+{
+  return static_shapers.get_unconst ();
+}