--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/harfbuzz/util/shape-options.hh	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,329 @@
+/*
+ * Copyright © 2011  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
+ */
+
+#ifndef SHAPE_OPTIONS_HH
+#define SHAPE_OPTIONS_HH
+
+#include "options.hh"
+
+struct shape_options_t
+{
+  ~shape_options_t ()
+  {
+    g_free (direction);
+    g_free (language);
+    g_free (script);
+    free (features);
+    g_strfreev (shapers);
+  }
+
+  void add_options (option_parser_t *parser);
+
+  void setup_buffer (hb_buffer_t *buffer)
+  {
+    hb_buffer_set_direction (buffer, hb_direction_from_string (direction, -1));
+    hb_buffer_set_script (buffer, hb_script_from_string (script, -1));
+    hb_buffer_set_language (buffer, hb_language_from_string (language, -1));
+    hb_buffer_set_flags (buffer, (hb_buffer_flags_t)
+				 (HB_BUFFER_FLAG_DEFAULT |
+				  (bot ? HB_BUFFER_FLAG_BOT : 0) |
+				  (eot ? HB_BUFFER_FLAG_EOT : 0) |
+				  (verify ? HB_BUFFER_FLAG_VERIFY : 0) |
+				  (unsafe_to_concat ? HB_BUFFER_FLAG_PRODUCE_UNSAFE_TO_CONCAT : 0) |
+				  (safe_to_insert_tatweel ? HB_BUFFER_FLAG_PRODUCE_SAFE_TO_INSERT_TATWEEL : 0) |
+				  (preserve_default_ignorables ? HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES : 0) |
+				  (remove_default_ignorables ? HB_BUFFER_FLAG_REMOVE_DEFAULT_IGNORABLES : 0) |
+				  0));
+    hb_buffer_set_invisible_glyph (buffer, invisible_glyph);
+    hb_buffer_set_not_found_glyph (buffer, not_found_glyph);
+    hb_buffer_set_cluster_level (buffer, cluster_level);
+    hb_buffer_guess_segment_properties (buffer);
+  }
+
+  void populate_buffer (hb_buffer_t *buffer, const char *text, int text_len,
+			const char *text_before, const char *text_after)
+  {
+    hb_buffer_clear_contents (buffer);
+    if (text_before) {
+      unsigned int len = strlen (text_before);
+      hb_buffer_add_utf8 (buffer, text_before, len, len, 0);
+    }
+    hb_buffer_add_utf8 (buffer, text, text_len, 0, text_len);
+    if (text_after) {
+      hb_buffer_add_utf8 (buffer, text_after, -1, 0, 0);
+    }
+
+    if (!utf8_clusters) {
+      /* Reset cluster values to refer to Unicode character index
+       * instead of UTF-8 index. */
+      unsigned int num_glyphs = hb_buffer_get_length (buffer);
+      hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, nullptr);
+      for (unsigned int i = 0; i < num_glyphs; i++)
+      {
+	info->cluster = i;
+	info++;
+      }
+    }
+
+    setup_buffer (buffer);
+  }
+
+  hb_bool_t shape (hb_font_t *font, hb_buffer_t *buffer, const char **error=nullptr)
+  {
+    if (!hb_shape_full (font, buffer, features, num_features, shapers))
+    {
+      if (error)
+	*error = "Shaping failed.";
+      goto fail;
+    }
+
+    if (normalize_glyphs)
+      hb_buffer_normalize_glyphs (buffer);
+
+    return true;
+
+  fail:
+    return false;
+  }
+
+  void shape_closure (const char *text, int text_len,
+		      hb_font_t *font, hb_buffer_t *buffer,
+		      hb_set_t *glyphs)
+  {
+    hb_buffer_reset (buffer);
+    hb_buffer_add_utf8 (buffer, text, text_len, 0, text_len);
+    setup_buffer (buffer);
+    hb_ot_shape_glyphs_closure (font, buffer, features, num_features, glyphs);
+  }
+
+  /* Buffer properties */
+  char *direction = nullptr;
+  char *language = nullptr;
+  char *script = nullptr;
+
+  /* Buffer flags */
+  hb_bool_t bot = false;
+  hb_bool_t eot = false;
+  hb_bool_t preserve_default_ignorables = false;
+  hb_bool_t remove_default_ignorables = false;
+
+  hb_feature_t *features = nullptr;
+  unsigned int num_features = 0;
+  char **shapers = nullptr;
+  hb_bool_t utf8_clusters = false;
+  hb_codepoint_t invisible_glyph = 0;
+  hb_codepoint_t not_found_glyph = 0;
+  hb_buffer_cluster_level_t cluster_level = HB_BUFFER_CLUSTER_LEVEL_DEFAULT;
+  hb_bool_t normalize_glyphs = false;
+  hb_bool_t verify = false;
+  hb_bool_t unsafe_to_concat = false;
+  hb_bool_t safe_to_insert_tatweel = false;
+  unsigned int num_iterations = 1;
+};
+
+
+static gboolean
+parse_shapers (const char *name G_GNUC_UNUSED,
+	       const char *arg,
+	       gpointer    data,
+	       GError    **error)
+{
+  shape_options_t *shape_opts = (shape_options_t *) data;
+  char **shapers = g_strsplit (arg, ",", 0);
+
+  for (char **shaper = shapers; *shaper; shaper++)
+  {
+    bool found = false;
+    for (const char **hb_shaper = hb_shape_list_shapers (); *hb_shaper; hb_shaper++) {
+      if (strcmp (*shaper, *hb_shaper) == 0)
+      {
+	found = true;
+	break;
+      }
+    }
+    if (!found)
+    {
+      g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE,
+		   "Unknown or unsupported shaper: %s", *shaper);
+      g_strfreev (shapers);
+      return false;
+    }
+  }
+
+  g_strfreev (shape_opts->shapers);
+  shape_opts->shapers = shapers;
+  return true;
+}
+
+static G_GNUC_NORETURN gboolean
+list_shapers (const char *name G_GNUC_UNUSED,
+	      const char *arg G_GNUC_UNUSED,
+	      gpointer    data G_GNUC_UNUSED,
+	      GError    **error G_GNUC_UNUSED)
+{
+  for (const char **shaper = hb_shape_list_shapers (); *shaper; shaper++)
+    g_printf ("%s\n", *shaper);
+
+  exit(0);
+}
+
+
+static gboolean
+parse_features (const char *name G_GNUC_UNUSED,
+		const char *arg,
+		gpointer    data,
+		GError    **error G_GNUC_UNUSED)
+{
+  shape_options_t *shape_opts = (shape_options_t *) data;
+  char *s = (char *) arg;
+  size_t l = strlen (s);
+  char *p;
+
+  shape_opts->num_features = 0;
+  g_free (shape_opts->features);
+  shape_opts->features = nullptr;
+
+  /* if the string is quoted, strip the quotes */
+  if (s[0] == s[l - 1] && (s[0] == '\"' || s[0] == '\''))
+  {
+    s[l - 1] = '\0';
+    s++;
+  }
+
+  if (!*s)
+    return true;
+
+  /* count the features first, so we can allocate memory */
+  p = s;
+  do {
+    shape_opts->num_features++;
+    p = strpbrk (p, ", ");
+    if (p)
+      p++;
+  } while (p);
+
+  shape_opts->features = (hb_feature_t *) calloc (shape_opts->num_features, sizeof (*shape_opts->features));
+  if (!shape_opts->features)
+    return false;
+
+  /* now do the actual parsing */
+  p = s;
+  shape_opts->num_features = 0;
+  while (p && *p) {
+    char *end = strpbrk (p, ", ");
+    if (hb_feature_from_string (p, end ? end - p : -1, &shape_opts->features[shape_opts->num_features]))
+      shape_opts->num_features++;
+    p = end ? end + 1 : nullptr;
+  }
+
+  return true;
+}
+
+void
+shape_options_t::add_options (option_parser_t *parser)
+{
+  GOptionEntry entries[] =
+  {
+    {"list-shapers",	0, G_OPTION_FLAG_NO_ARG,
+			      G_OPTION_ARG_CALLBACK,	(gpointer) &list_shapers,	"List available shapers and quit",	nullptr},
+    {"shaper",		0, G_OPTION_FLAG_HIDDEN,
+			      G_OPTION_ARG_CALLBACK,	(gpointer) &parse_shapers,	"Hidden duplicate of --shapers",	nullptr},
+    {"shapers",		0, 0, G_OPTION_ARG_CALLBACK,	(gpointer) &parse_shapers,	"Set comma-separated list of shapers to try","list"},
+    {"direction",	0, 0, G_OPTION_ARG_STRING,	&this->direction,		"Set text direction (default: auto)",	"ltr/rtl/ttb/btt"},
+    {"language",	0, 0, G_OPTION_ARG_STRING,	&this->language,		"Set text language (default: $LANG)",	"BCP 47 tag"},
+    {"script",		0, 0, G_OPTION_ARG_STRING,	&this->script,			"Set text script (default: auto)",	"ISO-15924 tag"},
+    {"bot",		0, 0, G_OPTION_ARG_NONE,	&this->bot,			"Treat text as beginning-of-paragraph",	nullptr},
+    {"eot",		0, 0, G_OPTION_ARG_NONE,	&this->eot,			"Treat text as end-of-paragraph",	nullptr},
+    {"preserve-default-ignorables",0, 0, G_OPTION_ARG_NONE,	&this->preserve_default_ignorables,	"Preserve Default-Ignorable characters",	nullptr},
+    {"remove-default-ignorables",0, 0, G_OPTION_ARG_NONE,	&this->remove_default_ignorables,	"Remove Default-Ignorable characters",	nullptr},
+    {"invisible-glyph",	0, 0, G_OPTION_ARG_INT,		&this->invisible_glyph,		"Glyph value to replace Default-Ignorables with",	nullptr},
+    {"not-found-glyph",	0, 0, G_OPTION_ARG_INT,		&this->not_found_glyph,		"Glyph value to replace not-found characters with",	nullptr},
+    {"utf8-clusters",	0, 0, G_OPTION_ARG_NONE,	&this->utf8_clusters,		"Use UTF8 byte indices, not char indices",	nullptr},
+    {"cluster-level",	0, 0, G_OPTION_ARG_INT,		&this->cluster_level,		"Cluster merging level (default: 0)",	"0/1/2"},
+    {"normalize-glyphs",0, 0, G_OPTION_ARG_NONE,	&this->normalize_glyphs,	"Rearrange glyph clusters in nominal order",	nullptr},
+    {"unsafe-to-concat",0, 0, G_OPTION_ARG_NONE,	&this->unsafe_to_concat,	"Produce unsafe-to-concat glyph flag",	nullptr},
+    {"safe-to-insert-tatweel",0, 0, G_OPTION_ARG_NONE,	&this->safe_to_insert_tatweel,	"Produce safe-to-insert-tatweel glyph flag",	nullptr},
+    {"verify",		0, 0, G_OPTION_ARG_NONE,	&this->verify,			"Perform sanity checks on shaping results",	nullptr},
+    {"num-iterations", 'n', G_OPTION_FLAG_IN_MAIN,
+			      G_OPTION_ARG_INT,		&this->num_iterations,		"Run shaper N times (default: 1)",	"N"},
+    {nullptr}
+  };
+  parser->add_group (entries,
+		     "shape",
+		     "Shape options:",
+		     "Options for the shaping process",
+		     this);
+
+  const gchar *features_help = "Comma-separated list of font features\n"
+    "\n"
+    "    Features can be enabled or disabled, either globally or limited to\n"
+    "    specific character ranges.  The format for specifying feature settings\n"
+    "    follows.  All valid CSS font-feature-settings values other than 'normal'\n"
+    "    and the global values are also accepted, though not documented below.\n"
+    "    CSS string escapes are not supported."
+    "\n"
+    "    The range indices refer to the positions between Unicode characters,\n"
+    "    unless the --utf8-clusters is provided, in which case range indices\n"
+    "    refer to UTF-8 byte indices. The position before the first character\n"
+    "    is always 0.\n"
+    "\n"
+    "    The format is Python-esque.  Here is how it all works:\n"
+    "\n"
+    "      Syntax:       Value:    Start:    End:\n"
+    "\n"
+    "    Setting value:\n"
+    "      \"kern\"        1         0         ∞         # Turn feature on\n"
+    "      \"+kern\"       1         0         ∞         # Turn feature on\n"
+    "      \"-kern\"       0         0         ∞         # Turn feature off\n"
+    "      \"kern=0\"      0         0         ∞         # Turn feature off\n"
+    "      \"kern=1\"      1         0         ∞         # Turn feature on\n"
+    "      \"aalt=2\"      2         0         ∞         # Choose 2nd alternate\n"
+    "\n"
+    "    Setting index:\n"
+    "      \"kern[]\"      1         0         ∞         # Turn feature on\n"
+    "      \"kern[:]\"     1         0         ∞         # Turn feature on\n"
+    "      \"kern[5:]\"    1         5         ∞         # Turn feature on, partial\n"
+    "      \"kern[:5]\"    1         0         5         # Turn feature on, partial\n"
+    "      \"kern[3:5]\"   1         3         5         # Turn feature on, range\n"
+    "      \"kern[3]\"     1         3         3+1       # Turn feature on, single char\n"
+    "\n"
+    "    Mixing it all:\n"
+    "\n"
+    "      \"aalt[3:5]=2\" 2         3         5         # Turn 2nd alternate on for range";
+
+  GOptionEntry entries2[] =
+  {
+    {"features",	0, 0, G_OPTION_ARG_CALLBACK,	(gpointer) &parse_features,	features_help,	"list"},
+    {nullptr}
+  };
+  parser->add_group (entries2,
+		     "features",
+		     "Features options:",
+		     "Options for font features used",
+		     this);
+}
+
+#endif