--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/harfbuzz/src/hb-ot-shaper.hh	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,403 @@
+/*
+ * Copyright © 2010,2011,2012  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
+ */
+
+#ifndef HB_OT_SHAPER_HH
+#define HB_OT_SHAPER_HH
+
+#include "hb.hh"
+
+#include "hb-ot-layout.hh"
+#include "hb-ot-shape.hh"
+#include "hb-ot-shape-normalize.hh"
+
+
+/* buffer var allocations, used by all OT shapers */
+#define ot_shaper_var_u8_category()	var2.u8[2]
+#define ot_shaper_var_u8_auxiliary()	var2.u8[3]
+
+
+#define HB_OT_SHAPE_MAX_COMBINING_MARKS 32
+
+enum hb_ot_shape_zero_width_marks_type_t {
+  HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE,
+  HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY,
+  HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE
+};
+
+
+/* Master OT shaper list */
+#define HB_OT_SHAPERS_IMPLEMENT_SHAPERS \
+  HB_OT_SHAPER_IMPLEMENT (arabic) \
+  HB_OT_SHAPER_IMPLEMENT (default) \
+  HB_OT_SHAPER_IMPLEMENT (dumber) \
+  HB_OT_SHAPER_IMPLEMENT (hangul) \
+  HB_OT_SHAPER_IMPLEMENT (hebrew) \
+  HB_OT_SHAPER_IMPLEMENT (indic) \
+  HB_OT_SHAPER_IMPLEMENT (khmer) \
+  HB_OT_SHAPER_IMPLEMENT (myanmar) \
+  HB_OT_SHAPER_IMPLEMENT (myanmar_zawgyi) \
+  HB_OT_SHAPER_IMPLEMENT (thai) \
+  HB_OT_SHAPER_IMPLEMENT (use) \
+  /* ^--- Add new shapers here; keep sorted. */
+
+
+struct hb_ot_shaper_t
+{
+  /* collect_features()
+   * Called during shape_plan().
+   * Shapers should use plan->map to add their features and callbacks.
+   * May be NULL.
+   */
+  void (*collect_features) (hb_ot_shape_planner_t *plan);
+
+  /* override_features()
+   * Called during shape_plan().
+   * Shapers should use plan->map to override features and add callbacks after
+   * common features are added.
+   * May be NULL.
+   */
+  void (*override_features) (hb_ot_shape_planner_t *plan);
+
+
+  /* data_create()
+   * Called at the end of shape_plan().
+   * Whatever shapers return will be accessible through plan->data later.
+   * If nullptr is returned, means a plan failure.
+   */
+  void *(*data_create) (const hb_ot_shape_plan_t *plan);
+
+  /* data_destroy()
+   * Called when the shape_plan is being destroyed.
+   * plan->data is passed here for destruction.
+   * If nullptr is returned, means a plan failure.
+   * May be NULL.
+   */
+  void (*data_destroy) (void *data);
+
+
+  /* preprocess_text()
+   * Called during shape().
+   * Shapers can use to modify text before shaping starts.
+   * May be NULL.
+   */
+  void (*preprocess_text) (const hb_ot_shape_plan_t *plan,
+			   hb_buffer_t              *buffer,
+			   hb_font_t                *font);
+
+  /* postprocess_glyphs()
+   * Called during shape().
+   * Shapers can use to modify glyphs after shaping ends.
+   * May be NULL.
+   */
+  void (*postprocess_glyphs) (const hb_ot_shape_plan_t *plan,
+			      hb_buffer_t              *buffer,
+			      hb_font_t                *font);
+
+
+  /* decompose()
+   * Called during shape()'s normalization.
+   * May be NULL.
+   */
+  bool (*decompose) (const hb_ot_shape_normalize_context_t *c,
+		     hb_codepoint_t  ab,
+		     hb_codepoint_t *a,
+		     hb_codepoint_t *b);
+
+  /* compose()
+   * Called during shape()'s normalization.
+   * May be NULL.
+   */
+  bool (*compose) (const hb_ot_shape_normalize_context_t *c,
+		   hb_codepoint_t  a,
+		   hb_codepoint_t  b,
+		   hb_codepoint_t *ab);
+
+  /* setup_masks()
+   * Called during shape().
+   * Shapers should use map to get feature masks and set on buffer.
+   * Shapers may NOT modify characters.
+   * May be NULL.
+   */
+  void (*setup_masks) (const hb_ot_shape_plan_t *plan,
+		       hb_buffer_t              *buffer,
+		       hb_font_t                *font);
+
+  /* reorder_marks()
+   * Called during shape().
+   * Shapers can use to modify ordering of combining marks.
+   * May be NULL.
+   */
+  void (*reorder_marks) (const hb_ot_shape_plan_t *plan,
+			 hb_buffer_t              *buffer,
+			 unsigned int              start,
+			 unsigned int              end);
+
+  /* gpos_tag()
+   * If not HB_TAG_NONE, then must match found GPOS script tag for
+   * GPOS to be applied.  Otherwise, fallback positioning will be used.
+   */
+  hb_tag_t gpos_tag;
+
+  hb_ot_shape_normalization_mode_t normalization_preference;
+
+  hb_ot_shape_zero_width_marks_type_t zero_width_marks;
+
+  bool fallback_position;
+};
+
+#define HB_OT_SHAPER_IMPLEMENT(name) extern HB_INTERNAL const hb_ot_shaper_t _hb_ot_shaper_##name;
+HB_OT_SHAPERS_IMPLEMENT_SHAPERS
+#undef HB_OT_SHAPER_IMPLEMENT
+
+
+static inline const hb_ot_shaper_t *
+hb_ot_shaper_categorize (const hb_ot_shape_planner_t *planner)
+{
+  switch ((hb_tag_t) planner->props.script)
+  {
+    default:
+      return &_hb_ot_shaper_default;
+
+
+    /* Unicode-1.1 additions */
+    case HB_SCRIPT_ARABIC:
+
+    /* Unicode-3.0 additions */
+    case HB_SCRIPT_SYRIAC:
+
+      /* For Arabic script, use the Arabic shaper even if no OT script tag was found.
+       * This is because we do fallback shaping for Arabic script (and not others).
+       * But note that Arabic shaping is applicable only to horizontal layout; for
+       * vertical text, just use the generic shaper instead. */
+      if ((planner->map.chosen_script[0] != HB_OT_TAG_DEFAULT_SCRIPT ||
+	   planner->props.script == HB_SCRIPT_ARABIC) &&
+	  HB_DIRECTION_IS_HORIZONTAL(planner->props.direction))
+	return &_hb_ot_shaper_arabic;
+      else
+	return &_hb_ot_shaper_default;
+
+
+    /* Unicode-1.1 additions */
+    case HB_SCRIPT_THAI:
+    case HB_SCRIPT_LAO:
+
+      return &_hb_ot_shaper_thai;
+
+
+    /* Unicode-1.1 additions */
+    case HB_SCRIPT_HANGUL:
+
+      return &_hb_ot_shaper_hangul;
+
+
+    /* Unicode-1.1 additions */
+    case HB_SCRIPT_HEBREW:
+
+      return &_hb_ot_shaper_hebrew;
+
+
+    /* Unicode-1.1 additions */
+    case HB_SCRIPT_BENGALI:
+    case HB_SCRIPT_DEVANAGARI:
+    case HB_SCRIPT_GUJARATI:
+    case HB_SCRIPT_GURMUKHI:
+    case HB_SCRIPT_KANNADA:
+    case HB_SCRIPT_MALAYALAM:
+    case HB_SCRIPT_ORIYA:
+    case HB_SCRIPT_TAMIL:
+    case HB_SCRIPT_TELUGU:
+
+      /* If the designer designed the font for the 'DFLT' script,
+       * (or we ended up arbitrarily pick 'latn'), use the default shaper.
+       * Otherwise, use the specific shaper.
+       *
+       * If it's indy3 tag, send to USE. */
+      if (planner->map.chosen_script[0] == HB_TAG ('D','F','L','T') ||
+	  planner->map.chosen_script[0] == HB_TAG ('l','a','t','n'))
+	return &_hb_ot_shaper_default;
+      else if ((planner->map.chosen_script[0] & 0x000000FF) == '3')
+	return &_hb_ot_shaper_use;
+      else
+	return &_hb_ot_shaper_indic;
+
+    case HB_SCRIPT_KHMER:
+	return &_hb_ot_shaper_khmer;
+
+    case HB_SCRIPT_MYANMAR:
+      /* If the designer designed the font for the 'DFLT' script,
+       * (or we ended up arbitrarily pick 'latn'), use the default shaper.
+       * Otherwise, use the specific shaper.
+       *
+       * If designer designed for 'mymr' tag, also send to default
+       * shaper.  That's tag used from before Myanmar shaping spec
+       * was developed.  The shaping spec uses 'mym2' tag. */
+      if (planner->map.chosen_script[0] == HB_TAG ('D','F','L','T') ||
+	  planner->map.chosen_script[0] == HB_TAG ('l','a','t','n') ||
+	  planner->map.chosen_script[0] == HB_TAG ('m','y','m','r'))
+	return &_hb_ot_shaper_default;
+      else
+	return &_hb_ot_shaper_myanmar;
+
+
+#ifndef HB_NO_OT_SHAPER_MYANMAR_ZAWGYI
+#define HB_SCRIPT_MYANMAR_ZAWGYI	((hb_script_t) HB_TAG ('Q','a','a','g'))
+    case HB_SCRIPT_MYANMAR_ZAWGYI:
+    /* https://github.com/harfbuzz/harfbuzz/issues/1162 */
+
+      return &_hb_ot_shaper_myanmar_zawgyi;
+#endif
+
+
+    /* Unicode-2.0 additions */
+    case HB_SCRIPT_TIBETAN:
+
+    /* Unicode-3.0 additions */
+    case HB_SCRIPT_MONGOLIAN:
+    case HB_SCRIPT_SINHALA:
+
+    /* Unicode-3.2 additions */
+    case HB_SCRIPT_BUHID:
+    case HB_SCRIPT_HANUNOO:
+    case HB_SCRIPT_TAGALOG:
+    case HB_SCRIPT_TAGBANWA:
+
+    /* Unicode-4.0 additions */
+    case HB_SCRIPT_LIMBU:
+    case HB_SCRIPT_TAI_LE:
+
+    /* Unicode-4.1 additions */
+    case HB_SCRIPT_BUGINESE:
+    case HB_SCRIPT_KHAROSHTHI:
+    case HB_SCRIPT_SYLOTI_NAGRI:
+    case HB_SCRIPT_TIFINAGH:
+
+    /* Unicode-5.0 additions */
+    case HB_SCRIPT_BALINESE:
+    case HB_SCRIPT_NKO:
+    case HB_SCRIPT_PHAGS_PA:
+
+    /* Unicode-5.1 additions */
+    case HB_SCRIPT_CHAM:
+    case HB_SCRIPT_KAYAH_LI:
+    case HB_SCRIPT_LEPCHA:
+    case HB_SCRIPT_REJANG:
+    case HB_SCRIPT_SAURASHTRA:
+    case HB_SCRIPT_SUNDANESE:
+
+    /* Unicode-5.2 additions */
+    case HB_SCRIPT_EGYPTIAN_HIEROGLYPHS:
+    case HB_SCRIPT_JAVANESE:
+    case HB_SCRIPT_KAITHI:
+    case HB_SCRIPT_MEETEI_MAYEK:
+    case HB_SCRIPT_TAI_THAM:
+    case HB_SCRIPT_TAI_VIET:
+
+    /* Unicode-6.0 additions */
+    case HB_SCRIPT_BATAK:
+    case HB_SCRIPT_BRAHMI:
+    case HB_SCRIPT_MANDAIC:
+
+    /* Unicode-6.1 additions */
+    case HB_SCRIPT_CHAKMA:
+    case HB_SCRIPT_MIAO:
+    case HB_SCRIPT_SHARADA:
+    case HB_SCRIPT_TAKRI:
+
+    /* Unicode-7.0 additions */
+    case HB_SCRIPT_DUPLOYAN:
+    case HB_SCRIPT_GRANTHA:
+    case HB_SCRIPT_KHOJKI:
+    case HB_SCRIPT_KHUDAWADI:
+    case HB_SCRIPT_MAHAJANI:
+    case HB_SCRIPT_MANICHAEAN:
+    case HB_SCRIPT_MODI:
+    case HB_SCRIPT_PAHAWH_HMONG:
+    case HB_SCRIPT_PSALTER_PAHLAVI:
+    case HB_SCRIPT_SIDDHAM:
+    case HB_SCRIPT_TIRHUTA:
+
+    /* Unicode-8.0 additions */
+    case HB_SCRIPT_AHOM:
+    case HB_SCRIPT_MULTANI:
+
+    /* Unicode-9.0 additions */
+    case HB_SCRIPT_ADLAM:
+    case HB_SCRIPT_BHAIKSUKI:
+    case HB_SCRIPT_MARCHEN:
+    case HB_SCRIPT_NEWA:
+
+    /* Unicode-10.0 additions */
+    case HB_SCRIPT_MASARAM_GONDI:
+    case HB_SCRIPT_SOYOMBO:
+    case HB_SCRIPT_ZANABAZAR_SQUARE:
+
+    /* Unicode-11.0 additions */
+    case HB_SCRIPT_DOGRA:
+    case HB_SCRIPT_GUNJALA_GONDI:
+    case HB_SCRIPT_HANIFI_ROHINGYA:
+    case HB_SCRIPT_MAKASAR:
+    case HB_SCRIPT_MEDEFAIDRIN:
+    case HB_SCRIPT_OLD_SOGDIAN:
+    case HB_SCRIPT_SOGDIAN:
+
+    /* Unicode-12.0 additions */
+    case HB_SCRIPT_ELYMAIC:
+    case HB_SCRIPT_NANDINAGARI:
+    case HB_SCRIPT_NYIAKENG_PUACHUE_HMONG:
+    case HB_SCRIPT_WANCHO:
+
+    /* Unicode-13.0 additions */
+    case HB_SCRIPT_CHORASMIAN:
+    case HB_SCRIPT_DIVES_AKURU:
+    case HB_SCRIPT_KHITAN_SMALL_SCRIPT:
+    case HB_SCRIPT_YEZIDI:
+
+    /* Unicode-14.0 additions */
+    case HB_SCRIPT_CYPRO_MINOAN:
+    case HB_SCRIPT_OLD_UYGHUR:
+    case HB_SCRIPT_TANGSA:
+    case HB_SCRIPT_TOTO:
+    case HB_SCRIPT_VITHKUQI:
+
+    /* Unicode-15.0 additions */
+    case HB_SCRIPT_KAWI:
+    case HB_SCRIPT_NAG_MUNDARI:
+
+      /* If the designer designed the font for the 'DFLT' script,
+       * (or we ended up arbitrarily pick 'latn'), use the default shaper.
+       * Otherwise, use the specific shaper.
+       * Note that for some simple scripts, there may not be *any*
+       * GSUB/GPOS needed, so there may be no scripts found! */
+      if (planner->map.chosen_script[0] == HB_TAG ('D','F','L','T') ||
+	  planner->map.chosen_script[0] == HB_TAG ('l','a','t','n'))
+	return &_hb_ot_shaper_default;
+      else
+	return &_hb_ot_shaper_use;
+  }
+}
+
+
+#endif /* HB_OT_SHAPER_HH */