src/hb-ot-shape-complex-myanmar.cc - platform/external/harfbuzz_ng - Git at Google

 /*
  * Copyright © 2011,2012,2013  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-ot-shape-complex-indic-private.hh"

 /* buffer var allocations */
 #define myanmar_category() complex_var_u8_0() /* myanmar_category_t */
 #define myanmar_position() complex_var_u8_1() /* myanmar_position_t */


 /*
  * Myanmar shaper.
  */

 static const hb_tag_t
 myanmar_features[] =
 {
   /*
    * Basic features.
    * These features are applied in order, one at a time, after initial_reordering.
    */
   HB_TAG('r','p','h','f'),
   HB_TAG('p','r','e','f'),
   HB_TAG('b','l','w','f'),
   HB_TAG('p','s','t','f'),
   /*
    * Other features.
    * These features are applied all at once, after final_reordering.
    */
   HB_TAG('p','r','e','s'),
   HB_TAG('a','b','v','s'),
   HB_TAG('b','l','w','s'),
   HB_TAG('p','s','t','s'),
   /* Positioning features, though we don't care about the types. */
   HB_TAG('d','i','s','t'),
 };

 /*
  * Must be in the same order as the myanmar_features array.
  */
 enum {
   _RPHF,
   _PREF,
   _BLWF,
   _PSTF,

   _PRES,
   _ABVS,
   _BLWS,
   _PSTS,
   _DIST,

   MYANMAR_NUM_FEATURES,
   MYANMAR_BASIC_FEATURES = _PRES /* Don't forget to update this! */
 };

 static void
 setup_syllables (const hb_ot_shape_plan_t *plan,
 		 hb_font_t *font,
 		 hb_buffer_t *buffer);
 static void
 initial_reordering (const hb_ot_shape_plan_t *plan,
 		    hb_font_t *font,
 		    hb_buffer_t *buffer);
 static void
 final_reordering (const hb_ot_shape_plan_t *plan,
 		  hb_font_t *font,
 		  hb_buffer_t *buffer);

 static void
 collect_features_myanmar (hb_ot_shape_planner_t *plan)
 {
   hb_ot_map_builder_t *map = &plan->map;

   /* Do this before any lookups have been applied. */
   map->add_gsub_pause (setup_syllables);

   map->add_bool_feature (HB_TAG('l','o','c','l'));
   /* The Indic specs do not require ccmp, but we apply it here since if
    * there is a use of it, it's typically at the beginning. */
   map->add_bool_feature (HB_TAG('c','c','m','p'));


   unsigned int i = 0;
   map->add_gsub_pause (initial_reordering);
   for (; i < MYANMAR_BASIC_FEATURES; i++) {
     map->add_bool_feature (myanmar_features[i]);
     map->add_gsub_pause (NULL);
   }
   map->add_gsub_pause (final_reordering);
   for (; i < MYANMAR_NUM_FEATURES; i++) {
     map->add_bool_feature (myanmar_features[i]);
   }
 }

 static void
 override_features_myanmar (hb_ot_shape_planner_t *plan)
 {
   plan->map.add_feature (HB_TAG('l','i','g','a'), 0, true);

   /*
    * Note:
    *
    * Spec says 'mark' is used, and the mmrtext.ttf font from
    * Windows 8 has lookups for it.  But testing suggests that
    * Windows 8 Uniscribe is NOT applying it.  It *is* applying
    * 'mkmk' however.
    */
   if (hb_options ().uniscribe_bug_compatible)
     plan->map.add_feature (HB_TAG('m','a','r','k'), 0, true);
 }


 enum syllable_type_t {
   consonant_syllable,
   broken_cluster,
   non_myanmar_cluster,
 };

 #include "hb-ot-shape-complex-myanmar-machine.hh"


 /* Note: This enum is duplicated in the -machine.rl source file.
  * Not sure how to avoid duplication. */
 enum myanmar_category_t {
   OT_As  = 18, /* Asat */
   OT_D   = 19, /* Digits except zero */
   OT_D0  = 20, /* Digit zero */
   OT_DB  = OT_N, /* Dot below */
   OT_GB  = OT_DOTTEDCIRCLE,
   OT_MH  = 21, /* Various consonant medial types */
   OT_MR  = 22, /* Various consonant medial types */
   OT_MW  = 23, /* Various consonant medial types */
   OT_MY  = 24, /* Various consonant medial types */
   OT_PT  = 25, /* Pwo and other tones */
   OT_VAbv = 26,
   OT_VBlw = 27,
   OT_VPre = 28,
   OT_VPst = 29,
   OT_VS   = 30 /* Variation selectors */
 };


 static inline bool
 is_one_of (const hb_glyph_info_t &info, unsigned int flags)
 {
   /* If it ligated, all bets are off. */
   if (is_a_ligature (info)) return false;
   return !!(FLAG (info.myanmar_category()) & flags);
 }

 /* Note:
  *
  * We treat Vowels and placeholders as if they were consonants.  This is safe because Vowels
  * cannot happen in a consonant syllable.  The plus side however is, we can call the
  * consonant syllable logic from the vowel syllable function and get it all right! */
 #define CONSONANT_FLAGS (FLAG (OT_C) | FLAG (OT_CM) | FLAG (OT_Ra) | FLAG (OT_V) | FLAG (OT_NBSP) | FLAG (OT_GB))
 static inline bool
 is_consonant (const hb_glyph_info_t &info)
 {
   return is_one_of (info, CONSONANT_FLAGS);
 }


 static inline void
 set_myanmar_properties (hb_glyph_info_t &info)
 {
   hb_codepoint_t u = info.codepoint;
   unsigned int type = hb_indic_get_categories (u);
   indic_category_t cat = (indic_category_t) (type & 0x7F);
   indic_position_t pos = (indic_position_t) (type >> 8);

   /* Myanmar
    * http://www.microsoft.com/typography/OpenTypeDev/myanmar/intro.htm#analyze
    */
   if (unlikely (hb_in_range<hb_codepoint_t> (u, 0xFE00, 0xFE0F)))
     cat = (indic_category_t) OT_VS;
   else if (unlikely (u == 0x200C)) cat = (indic_category_t) OT_ZWNJ;
   else if (unlikely (u == 0x200D)) cat = (indic_category_t) OT_ZWJ;

   switch (u)
   {
     case 0x002D: case 0x00A0: case 0x00D7: case 0x2012:
     case 0x2013: case 0x2014: case 0x2015: case 0x2022:
     case 0x25CC: case 0x25FB: case 0x25FC: case 0x25FD:
     case 0x25FE:
       cat = (indic_category_t) OT_GB;
       break;

     case 0x1004: case 0x101B: case 0x105A:
       cat = (indic_category_t) OT_Ra;
       break;

     case 0x1032: case 0x1036:
       cat = (indic_category_t) OT_A;
       break;

     case 0x103A:
       cat = (indic_category_t) OT_As;
       break;

     case 0x1041: case 0x1042: case 0x1043: case 0x1044:
     case 0x1045: case 0x1046: case 0x1047: case 0x1048:
     case 0x1049: case 0x1090: case 0x1091: case 0x1092:
     case 0x1093: case 0x1094: case 0x1095: case 0x1096:
     case 0x1097: case 0x1098: case 0x1099:
       cat = (indic_category_t) OT_D;
       break;

     case 0x1040:
       cat = (indic_category_t) OT_D; /* XXX The spec says D0, but Uniscribe doesn't seem to do. */
       break;

     case 0x103E: case 0x1060:
       cat = (indic_category_t) OT_MH;
       break;

     case 0x103C:
       cat = (indic_category_t) OT_MR;
       break;

     case 0x103D: case 0x1082:
       cat = (indic_category_t) OT_MW;
       break;

     case 0x103B: case 0x105E: case 0x105F:
       cat = (indic_category_t) OT_MY;
       break;

     case 0x1063: case 0x1064: case 0x1069: case 0x106A:
     case 0x106B: case 0x106C: case 0x106D: case 0xAA7B:
       cat = (indic_category_t) OT_PT;
       break;

     case 0x1038: case 0x1087: case 0x1088: case 0x1089:
     case 0x108A: case 0x108B: case 0x108C: case 0x108D:
     case 0x108F: case 0x109A: case 0x109B: case 0x109C:
       cat = (indic_category_t) OT_SM;
       break;
   }

   if (cat == OT_M)
   {
     switch ((int) pos)
     {
       case POS_PRE_C:	cat = (indic_category_t) OT_VPre;
 			pos = POS_PRE_M;                  break;
       case POS_ABOVE_C:	cat = (indic_category_t) OT_VAbv; break;
       case POS_BELOW_C:	cat = (indic_category_t) OT_VBlw; break;
       case POS_POST_C:	cat = (indic_category_t) OT_VPst; break;
     }
   }

   info.myanmar_category() = (myanmar_category_t) cat;
   info.myanmar_position() = pos;
 }


 static void
 setup_masks_myanmar (const hb_ot_shape_plan_t *plan HB_UNUSED,
 		   hb_buffer_t              *buffer,
 		   hb_font_t                *font HB_UNUSED)
 {
   HB_BUFFER_ALLOCATE_VAR (buffer, myanmar_category);
   HB_BUFFER_ALLOCATE_VAR (buffer, myanmar_position);

   /* We cannot setup masks here.  We save information about characters
    * and setup masks later on in a pause-callback. */

   unsigned int count = buffer->len;
   for (unsigned int i = 0; i < count; i++)
     set_myanmar_properties (buffer->info[i]);
 }

 static void
 setup_syllables (const hb_ot_shape_plan_t *plan HB_UNUSED,
 		 hb_font_t *font HB_UNUSED,
 		 hb_buffer_t *buffer)
 {
   find_syllables (buffer);
 }

 static int
 compare_myanmar_order (const hb_glyph_info_t *pa, const hb_glyph_info_t *pb)
 {
   int a = pa->myanmar_position();
   int b = pb->myanmar_position();

   return a < b ? -1 : a == b ? 0 : +1;
 }


 /* Rules from:
  * http://www.microsoft.com/typography/OpenTypeDev/myanmar/intro.htm */

 static void
 initial_reordering_consonant_syllable (const hb_ot_shape_plan_t *plan,
 				       hb_face_t *face,
 				       hb_buffer_t *buffer,
 				       unsigned int start, unsigned int end)
 {
   hb_glyph_info_t *info = buffer->info;

   unsigned int base = end;
   bool has_reph = false;

   {
     unsigned int limit = start;
     if (start + 3 <= end &&
 	info[start  ].myanmar_category() == OT_Ra &&
 	info[start+1].myanmar_category() == OT_As &&
 	info[start+2].myanmar_category() == OT_H)
     {
       limit += 3;
       base = start;
       has_reph = true;
     }

     {
       if (!has_reph)
 	base = limit;

       for (unsigned int i = limit; i < end; i++)
 	if (is_consonant (info[i]))
 	{
 	  base = i;
 	  break;
 	}
     }
   }

   /* Reorder! */
   {
     unsigned int i = start;
     for (; i < start + (has_reph ? 3 : 0); i++)
       info[i].myanmar_position() = POS_AFTER_MAIN;
     for (; i < base; i++)
       info[i].myanmar_position() = POS_PRE_C;
     if (i < end)
     {
       info[i].myanmar_position() = POS_BASE_C;
       i++;
     }
     indic_position_t pos = POS_AFTER_MAIN;
     /* The following loop may be ugly, but it implements all of
      * Myanmar reordering! */
     for (; i < end; i++)
     {
       if (info[i].myanmar_category() == OT_MR) /* Pre-base reordering */
       {
 	info[i].myanmar_position() = POS_PRE_C;
 	continue;
       }
       if (info[i].myanmar_position() < POS_BASE_C) /* Left matra */
       {
 	continue;
       }

       if (pos == POS_AFTER_MAIN && info[i].myanmar_category() == OT_VBlw)
       {
 	pos = POS_BELOW_C;
 	info[i].myanmar_position() = pos;
 	continue;
       }

       if (pos == POS_BELOW_C && info[i].myanmar_category() == OT_A)
       {
 	info[i].myanmar_position() = POS_BEFORE_SUB;
 	continue;
       }
       if (pos == POS_BELOW_C && info[i].myanmar_category() == OT_VBlw)
       {
 	info[i].myanmar_position() = pos;
 	continue;
       }
       if (pos == POS_BELOW_C && info[i].myanmar_category() != OT_A)
       {
         pos = POS_AFTER_SUB;
 	info[i].myanmar_position() = pos;
 	continue;
       }
       info[i].myanmar_position() = pos;
     }
   }

   buffer->merge_clusters (start, end);
   /* Sit tight, rock 'n roll! */
   hb_bubble_sort (info + start, end - start, compare_myanmar_order);
 }

 static void
 initial_reordering_broken_cluster (const hb_ot_shape_plan_t *plan,
 				   hb_face_t *face,
 				   hb_buffer_t *buffer,
 				   unsigned int start, unsigned int end)
 {
   /* We already inserted dotted-circles, so just call the consonant_syllable. */
   initial_reordering_consonant_syllable (plan, face, buffer, start, end);
 }

 static void
 initial_reordering_non_myanmar_cluster (const hb_ot_shape_plan_t *plan HB_UNUSED,
 					hb_face_t *face HB_UNUSED,
 					hb_buffer_t *buffer HB_UNUSED,
 					unsigned int start HB_UNUSED, unsigned int end HB_UNUSED)
 {
   /* Nothing to do right now.  If we ever switch to using the output
    * buffer in the reordering process, we'd need to next_glyph() here. */
 }


 static void
 initial_reordering_syllable (const hb_ot_shape_plan_t *plan,
 			     hb_face_t *face,
 			     hb_buffer_t *buffer,
 			     unsigned int start, unsigned int end)
 {
   syllable_type_t syllable_type = (syllable_type_t) (buffer->info[start].syllable() & 0x0F);
   switch (syllable_type) {
   case consonant_syllable:	initial_reordering_consonant_syllable  (plan, face, buffer, start, end); return;
   case broken_cluster:		initial_reordering_broken_cluster      (plan, face, buffer, start, end); return;
   case non_myanmar_cluster:	initial_reordering_non_myanmar_cluster (plan, face, buffer, start, end); return;
   }
 }

 static inline void
 insert_dotted_circles (const hb_ot_shape_plan_t *plan HB_UNUSED,
 		       hb_font_t *font,
 		       hb_buffer_t *buffer)
 {
   /* Note: This loop is extra overhead, but should not be measurable. */
   bool has_broken_syllables = false;
   unsigned int count = buffer->len;
   for (unsigned int i = 0; i < count; i++)
     if ((buffer->info[i].syllable() & 0x0F) == broken_cluster) {
       has_broken_syllables = true;
       break;
     }
   if (likely (!has_broken_syllables))
     return;


   hb_codepoint_t dottedcircle_glyph;
   if (!font->get_glyph (0x25CC, 0, &dottedcircle_glyph))
     return;

   hb_glyph_info_t dottedcircle = {0};
   dottedcircle.codepoint = 0x25CC;
   set_myanmar_properties (dottedcircle);
   dottedcircle.codepoint = dottedcircle_glyph;

   buffer->clear_output ();

   buffer->idx = 0;
   unsigned int last_syllable = 0;
   while (buffer->idx < buffer->len)
   {
     unsigned int syllable = buffer->cur().syllable();
     syllable_type_t syllable_type = (syllable_type_t) (syllable & 0x0F);
     if (unlikely (last_syllable != syllable && syllable_type == broken_cluster))
     {
       last_syllable = syllable;

       hb_glyph_info_t info = dottedcircle;
       info.cluster = buffer->cur().cluster;
       info.mask = buffer->cur().mask;
       info.syllable() = buffer->cur().syllable();

       buffer->output_info (info);
     }
     else
       buffer->next_glyph ();
   }

   buffer->swap_buffers ();
 }

 static void
 initial_reordering (const hb_ot_shape_plan_t *plan,
 		    hb_font_t *font,
 		    hb_buffer_t *buffer)
 {
   insert_dotted_circles (plan, font, buffer);

   hb_glyph_info_t *info = buffer->info;
   unsigned int count = buffer->len;
   if (unlikely (!count)) return;
   unsigned int last = 0;
   unsigned int last_syllable = info[0].syllable();
   for (unsigned int i = 1; i < count; i++)
     if (last_syllable != info[i].syllable()) {
       initial_reordering_syllable (plan, font->face, buffer, last, i);
       last = i;
       last_syllable = info[last].syllable();
     }
   initial_reordering_syllable (plan, font->face, buffer, last, count);
 }

 static void
 final_reordering (const hb_ot_shape_plan_t *plan,
 		  hb_font_t *font HB_UNUSED,
 		  hb_buffer_t *buffer)
 {
   hb_glyph_info_t *info = buffer->info;
   unsigned int count = buffer->len;

   /* Zero syllables now... */
   for (unsigned int i = 0; i < count; i++)
     info[i].syllable() = 0;

   HB_BUFFER_DEALLOCATE_VAR (buffer, myanmar_category);
   HB_BUFFER_DEALLOCATE_VAR (buffer, myanmar_position);
 }


 static hb_ot_shape_normalization_mode_t
 normalization_preference_myanmar (const hb_segment_properties_t *props HB_UNUSED)
 {
   return HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT;
 }


 const hb_ot_complex_shaper_t _hb_ot_complex_shaper_myanmar =
 {
   "myanmar",
   collect_features_myanmar,
   override_features_myanmar,
   NULL, /* data_create */
   NULL, /* data_destroy */
   NULL, /* preprocess_text */
   normalization_preference_myanmar,
   NULL, /* decompose */
   NULL, /* compose */
   setup_masks_myanmar,
   HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF,
   false, /* fallback_position */
 };
	/*
	* Copyright © 2011,2012,2013 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-ot-shape-complex-indic-private.hh"

	/* buffer var allocations */
	#define myanmar_category() complex_var_u8_0() /* myanmar_category_t */
	#define myanmar_position() complex_var_u8_1() /* myanmar_position_t */


	/*
	* Myanmar shaper.
	*/

	static const hb_tag_t
	myanmar_features[] =
	{
	/*
	* Basic features.
	* These features are applied in order, one at a time, after initial_reordering.
	*/
	HB_TAG('r','p','h','f'),
	HB_TAG('p','r','e','f'),
	HB_TAG('b','l','w','f'),
	HB_TAG('p','s','t','f'),
	/*
	* Other features.
	* These features are applied all at once, after final_reordering.
	*/
	HB_TAG('p','r','e','s'),
	HB_TAG('a','b','v','s'),
	HB_TAG('b','l','w','s'),
	HB_TAG('p','s','t','s'),
	/* Positioning features, though we don't care about the types. */
	HB_TAG('d','i','s','t'),
	};

	/*
	* Must be in the same order as the myanmar_features array.
	*/
	enum {
	_RPHF,
	_PREF,
	_BLWF,
	_PSTF,

	_PRES,
	_ABVS,
	_BLWS,
	_PSTS,
	_DIST,

	MYANMAR_NUM_FEATURES,
	MYANMAR_BASIC_FEATURES = _PRES /* Don't forget to update this! */
	};

	static void
	setup_syllables (const hb_ot_shape_plan_t *plan,
	hb_font_t *font,
	hb_buffer_t *buffer);
	static void
	initial_reordering (const hb_ot_shape_plan_t *plan,
	hb_font_t *font,
	hb_buffer_t *buffer);
	static void
	final_reordering (const hb_ot_shape_plan_t *plan,
	hb_font_t *font,
	hb_buffer_t *buffer);

	static void
	collect_features_myanmar (hb_ot_shape_planner_t *plan)
	{
	hb_ot_map_builder_t *map = &plan->map;

	/* Do this before any lookups have been applied. */
	map->add_gsub_pause (setup_syllables);

	map->add_bool_feature (HB_TAG('l','o','c','l'));
	/* The Indic specs do not require ccmp, but we apply it here since if
	* there is a use of it, it's typically at the beginning. */
	map->add_bool_feature (HB_TAG('c','c','m','p'));


	unsigned int i = 0;
	map->add_gsub_pause (initial_reordering);
	for (; i < MYANMAR_BASIC_FEATURES; i++) {
	map->add_bool_feature (myanmar_features[i]);
	map->add_gsub_pause (NULL);
	}
	map->add_gsub_pause (final_reordering);
	for (; i < MYANMAR_NUM_FEATURES; i++) {
	map->add_bool_feature (myanmar_features[i]);
	}
	}

	static void
	override_features_myanmar (hb_ot_shape_planner_t *plan)
	{
	plan->map.add_feature (HB_TAG('l','i','g','a'), 0, true);

	/*
	* Note:
	*
	* Spec says 'mark' is used, and the mmrtext.ttf font from
	* Windows 8 has lookups for it. But testing suggests that
	* Windows 8 Uniscribe is NOT applying it. It is applying
	* 'mkmk' however.
	*/
	if (hb_options ().uniscribe_bug_compatible)
	plan->map.add_feature (HB_TAG('m','a','r','k'), 0, true);
	}


	enum syllable_type_t {
	consonant_syllable,
	broken_cluster,
	non_myanmar_cluster,
	};

	#include "hb-ot-shape-complex-myanmar-machine.hh"


	/* Note: This enum is duplicated in the -machine.rl source file.
	* Not sure how to avoid duplication. */
	enum myanmar_category_t {
	OT_As = 18, /* Asat */
	OT_D = 19, /* Digits except zero */
	OT_D0 = 20, /* Digit zero */
	OT_DB = OT_N, /* Dot below */
	OT_GB = OT_DOTTEDCIRCLE,
	OT_MH = 21, /* Various consonant medial types */
	OT_MR = 22, /* Various consonant medial types */
	OT_MW = 23, /* Various consonant medial types */
	OT_MY = 24, /* Various consonant medial types */
	OT_PT = 25, /* Pwo and other tones */
	OT_VAbv = 26,
	OT_VBlw = 27,
	OT_VPre = 28,
	OT_VPst = 29,
	OT_VS = 30 /* Variation selectors */
	};


	static inline bool
	is_one_of (const hb_glyph_info_t &info, unsigned int flags)
	{
	/* If it ligated, all bets are off. */
	if (is_a_ligature (info)) return false;
	return !!(FLAG (info.myanmar_category()) & flags);
	}

	/* Note:
	*
	* We treat Vowels and placeholders as if they were consonants. This is safe because Vowels
	* cannot happen in a consonant syllable. The plus side however is, we can call the
	* consonant syllable logic from the vowel syllable function and get it all right! */
	#define CONSONANT_FLAGS (FLAG (OT_C) \| FLAG (OT_CM) \| FLAG (OT_Ra) \| FLAG (OT_V) \| FLAG (OT_NBSP) \| FLAG (OT_GB))
	static inline bool
	is_consonant (const hb_glyph_info_t &info)
	{
	return is_one_of (info, CONSONANT_FLAGS);
	}


	static inline void
	set_myanmar_properties (hb_glyph_info_t &info)
	{
	hb_codepoint_t u = info.codepoint;
	unsigned int type = hb_indic_get_categories (u);
	indic_category_t cat = (indic_category_t) (type & 0x7F);
	indic_position_t pos = (indic_position_t) (type >> 8);

	/* Myanmar
	* http://www.microsoft.com/typography/OpenTypeDev/myanmar/intro.htm#analyze
	*/
	if (unlikely (hb_in_range<hb_codepoint_t> (u, 0xFE00, 0xFE0F)))
	cat = (indic_category_t) OT_VS;
	else if (unlikely (u == 0x200C)) cat = (indic_category_t) OT_ZWNJ;
	else if (unlikely (u == 0x200D)) cat = (indic_category_t) OT_ZWJ;

	switch (u)
	{
	case 0x002D: case 0x00A0: case 0x00D7: case 0x2012:
	case 0x2013: case 0x2014: case 0x2015: case 0x2022:
	case 0x25CC: case 0x25FB: case 0x25FC: case 0x25FD:
	case 0x25FE:
	cat = (indic_category_t) OT_GB;
	break;

	case 0x1004: case 0x101B: case 0x105A:
	cat = (indic_category_t) OT_Ra;
	break;

	case 0x1032: case 0x1036:
	cat = (indic_category_t) OT_A;
	break;

	case 0x103A:
	cat = (indic_category_t) OT_As;
	break;

	case 0x1041: case 0x1042: case 0x1043: case 0x1044:
	case 0x1045: case 0x1046: case 0x1047: case 0x1048:
	case 0x1049: case 0x1090: case 0x1091: case 0x1092:
	case 0x1093: case 0x1094: case 0x1095: case 0x1096:
	case 0x1097: case 0x1098: case 0x1099:
	cat = (indic_category_t) OT_D;
	break;

	case 0x1040:
	cat = (indic_category_t) OT_D; /* XXX The spec says D0, but Uniscribe doesn't seem to do. */
	break;

	case 0x103E: case 0x1060:
	cat = (indic_category_t) OT_MH;
	break;

	case 0x103C:
	cat = (indic_category_t) OT_MR;
	break;

	case 0x103D: case 0x1082:
	cat = (indic_category_t) OT_MW;
	break;

	case 0x103B: case 0x105E: case 0x105F:
	cat = (indic_category_t) OT_MY;
	break;

	case 0x1063: case 0x1064: case 0x1069: case 0x106A:
	case 0x106B: case 0x106C: case 0x106D: case 0xAA7B:
	cat = (indic_category_t) OT_PT;
	break;

	case 0x1038: case 0x1087: case 0x1088: case 0x1089:
	case 0x108A: case 0x108B: case 0x108C: case 0x108D:
	case 0x108F: case 0x109A: case 0x109B: case 0x109C:
	cat = (indic_category_t) OT_SM;
	break;
	}

	if (cat == OT_M)
	{
	switch ((int) pos)
	{
	case POS_PRE_C: cat = (indic_category_t) OT_VPre;
	pos = POS_PRE_M; break;
	case POS_ABOVE_C: cat = (indic_category_t) OT_VAbv; break;
	case POS_BELOW_C: cat = (indic_category_t) OT_VBlw; break;
	case POS_POST_C: cat = (indic_category_t) OT_VPst; break;
	}
	}

	info.myanmar_category() = (myanmar_category_t) cat;
	info.myanmar_position() = pos;
	}



	static void
	setup_masks_myanmar (const hb_ot_shape_plan_t *plan HB_UNUSED,
	hb_buffer_t *buffer,
	hb_font_t *font HB_UNUSED)
	{
	HB_BUFFER_ALLOCATE_VAR (buffer, myanmar_category);
	HB_BUFFER_ALLOCATE_VAR (buffer, myanmar_position);

	/* We cannot setup masks here. We save information about characters
	* and setup masks later on in a pause-callback. */

	unsigned int count = buffer->len;
	for (unsigned int i = 0; i < count; i++)
	set_myanmar_properties (buffer->info[i]);
	}

	static void
	setup_syllables (const hb_ot_shape_plan_t *plan HB_UNUSED,
	hb_font_t *font HB_UNUSED,
	hb_buffer_t *buffer)
	{
	find_syllables (buffer);
	}

	static int
	compare_myanmar_order (const hb_glyph_info_t pa, const hb_glyph_info_t pb)
	{
	int a = pa->myanmar_position();
	int b = pb->myanmar_position();

	return a < b ? -1 : a == b ? 0 : +1;
	}


	/* Rules from:
	* http://www.microsoft.com/typography/OpenTypeDev/myanmar/intro.htm */

	static void
	initial_reordering_consonant_syllable (const hb_ot_shape_plan_t *plan,
	hb_face_t *face,
	hb_buffer_t *buffer,
	unsigned int start, unsigned int end)
	{
	hb_glyph_info_t *info = buffer->info;

	unsigned int base = end;
	bool has_reph = false;

	{
	unsigned int limit = start;
	if (start + 3 <= end &&
	info[start ].myanmar_category() == OT_Ra &&
	info[start+1].myanmar_category() == OT_As &&
	info[start+2].myanmar_category() == OT_H)
	{
	limit += 3;
	base = start;
	has_reph = true;
	}

	{
	if (!has_reph)
	base = limit;

	for (unsigned int i = limit; i < end; i++)
	if (is_consonant (info[i]))
	{
	base = i;
	break;
	}
	}
	}

	/* Reorder! */
	{
	unsigned int i = start;
	for (; i < start + (has_reph ? 3 : 0); i++)
	info[i].myanmar_position() = POS_AFTER_MAIN;
	for (; i < base; i++)
	info[i].myanmar_position() = POS_PRE_C;
	if (i < end)
	{
	info[i].myanmar_position() = POS_BASE_C;
	i++;
	}
	indic_position_t pos = POS_AFTER_MAIN;
	/* The following loop may be ugly, but it implements all of
	* Myanmar reordering! */
	for (; i < end; i++)
	{
	if (info[i].myanmar_category() == OT_MR) /* Pre-base reordering */
	{
	info[i].myanmar_position() = POS_PRE_C;
	continue;
	}
	if (info[i].myanmar_position() < POS_BASE_C) /* Left matra */
	{
	continue;
	}

	if (pos == POS_AFTER_MAIN && info[i].myanmar_category() == OT_VBlw)
	{
	pos = POS_BELOW_C;
	info[i].myanmar_position() = pos;
	continue;
	}

	if (pos == POS_BELOW_C && info[i].myanmar_category() == OT_A)
	{
	info[i].myanmar_position() = POS_BEFORE_SUB;
	continue;
	}
	if (pos == POS_BELOW_C && info[i].myanmar_category() == OT_VBlw)
	{
	info[i].myanmar_position() = pos;
	continue;
	}
	if (pos == POS_BELOW_C && info[i].myanmar_category() != OT_A)
	{
	pos = POS_AFTER_SUB;
	info[i].myanmar_position() = pos;
	continue;
	}
	info[i].myanmar_position() = pos;
	}
	}

	buffer->merge_clusters (start, end);
	/* Sit tight, rock 'n roll! */
	hb_bubble_sort (info + start, end - start, compare_myanmar_order);
	}

	static void
	initial_reordering_broken_cluster (const hb_ot_shape_plan_t *plan,
	hb_face_t *face,
	hb_buffer_t *buffer,
	unsigned int start, unsigned int end)
	{
	/* We already inserted dotted-circles, so just call the consonant_syllable. */
	initial_reordering_consonant_syllable (plan, face, buffer, start, end);
	}

	static void
	initial_reordering_non_myanmar_cluster (const hb_ot_shape_plan_t *plan HB_UNUSED,
	hb_face_t *face HB_UNUSED,
	hb_buffer_t *buffer HB_UNUSED,
	unsigned int start HB_UNUSED, unsigned int end HB_UNUSED)
	{
	/* Nothing to do right now. If we ever switch to using the output
	* buffer in the reordering process, we'd need to next_glyph() here. */
	}


	static void
	initial_reordering_syllable (const hb_ot_shape_plan_t *plan,
	hb_face_t *face,
	hb_buffer_t *buffer,
	unsigned int start, unsigned int end)
	{
	syllable_type_t syllable_type = (syllable_type_t) (buffer->info[start].syllable() & 0x0F);
	switch (syllable_type) {
	case consonant_syllable: initial_reordering_consonant_syllable (plan, face, buffer, start, end); return;
	case broken_cluster: initial_reordering_broken_cluster (plan, face, buffer, start, end); return;
	case non_myanmar_cluster: initial_reordering_non_myanmar_cluster (plan, face, buffer, start, end); return;
	}
	}

	static inline void
	insert_dotted_circles (const hb_ot_shape_plan_t *plan HB_UNUSED,
	hb_font_t *font,
	hb_buffer_t *buffer)
	{
	/* Note: This loop is extra overhead, but should not be measurable. */
	bool has_broken_syllables = false;
	unsigned int count = buffer->len;
	for (unsigned int i = 0; i < count; i++)
	if ((buffer->info[i].syllable() & 0x0F) == broken_cluster) {
	has_broken_syllables = true;
	break;
	}
	if (likely (!has_broken_syllables))
	return;


	hb_codepoint_t dottedcircle_glyph;
	if (!font->get_glyph (0x25CC, 0, &dottedcircle_glyph))
	return;

	hb_glyph_info_t dottedcircle = {0};
	dottedcircle.codepoint = 0x25CC;
	set_myanmar_properties (dottedcircle);
	dottedcircle.codepoint = dottedcircle_glyph;

	buffer->clear_output ();

	buffer->idx = 0;
	unsigned int last_syllable = 0;
	while (buffer->idx < buffer->len)
	{
	unsigned int syllable = buffer->cur().syllable();
	syllable_type_t syllable_type = (syllable_type_t) (syllable & 0x0F);
	if (unlikely (last_syllable != syllable && syllable_type == broken_cluster))
	{
	last_syllable = syllable;

	hb_glyph_info_t info = dottedcircle;
	info.cluster = buffer->cur().cluster;
	info.mask = buffer->cur().mask;
	info.syllable() = buffer->cur().syllable();

	buffer->output_info (info);
	}
	else
	buffer->next_glyph ();
	}

	buffer->swap_buffers ();
	}

	static void
	initial_reordering (const hb_ot_shape_plan_t *plan,
	hb_font_t *font,
	hb_buffer_t *buffer)
	{
	insert_dotted_circles (plan, font, buffer);

	hb_glyph_info_t *info = buffer->info;
	unsigned int count = buffer->len;
	if (unlikely (!count)) return;
	unsigned int last = 0;
	unsigned int last_syllable = info[0].syllable();
	for (unsigned int i = 1; i < count; i++)
	if (last_syllable != info[i].syllable()) {
	initial_reordering_syllable (plan, font->face, buffer, last, i);
	last = i;
	last_syllable = info[last].syllable();
	}
	initial_reordering_syllable (plan, font->face, buffer, last, count);
	}

	static void
	final_reordering (const hb_ot_shape_plan_t *plan,
	hb_font_t *font HB_UNUSED,
	hb_buffer_t *buffer)
	{
	hb_glyph_info_t *info = buffer->info;
	unsigned int count = buffer->len;

	/* Zero syllables now... */
	for (unsigned int i = 0; i < count; i++)
	info[i].syllable() = 0;

	HB_BUFFER_DEALLOCATE_VAR (buffer, myanmar_category);
	HB_BUFFER_DEALLOCATE_VAR (buffer, myanmar_position);
	}


	static hb_ot_shape_normalization_mode_t
	normalization_preference_myanmar (const hb_segment_properties_t *props HB_UNUSED)
	{
	return HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT;
	}


	const hb_ot_complex_shaper_t _hb_ot_complex_shaper_myanmar =
	{
	"myanmar",
	collect_features_myanmar,
	override_features_myanmar,
	NULL, /* data_create */
	NULL, /* data_destroy */
	NULL, /* preprocess_text */
	normalization_preference_myanmar,
	NULL, /* decompose */
	NULL, /* compose */
	setup_masks_myanmar,
	HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF,
	false, /* fallback_position */
	};