src/hb-ot-shape-complex-sea.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 sea_category() complex_var_u8_0() /* indic_category_t */
 #define sea_position() complex_var_u8_1() /* indic_position_t */


 /*
  * South-East Asian shaper.
  * Loosely based on the Myanmar spec / shaper.
  * There is no OpenType spec for this.
  */

 static const hb_tag_t
 sea_features[] =
 {
   /*
    * Basic features.
    * These features are applied in order, one at a time, after initial_reordering.
    */
   HB_TAG('p','r','e','f'),
   HB_TAG('a','b','v','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 sea_features array.
  */
 enum {
   _PREF,
   _ABVF,
   _BLWF,
   _PSTF,

   _PRES,
   _ABVS,
   _BLWS,
   _PSTS,
   _DIST,

   SEA_NUM_FEATURES,
   SEA_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_sea (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 < SEA_BASIC_FEATURES; i++) {
     map->add_bool_feature (sea_features[i]);
     map->add_gsub_pause (NULL);
   }
   map->add_gsub_pause (final_reordering);
   for (; i < SEA_NUM_FEATURES; i++) {
     map->add_bool_feature (sea_features[i]);
   }
 }

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


 enum syllable_type_t {
   consonant_syllable,
   broken_cluster,
   non_sea_cluster,
 };

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


 /* Note: This enum is duplicated in the -machine.rl source file.
  * Not sure how to avoid duplication. */
 enum sea_category_t {
 //  OT_C    = 1,
   OT_GB   = 12, /* Generic Base XXX DOTTED CIRCLE only for now */
 //  OT_H    = 4,  /* Halant */
   OT_IV   = 2,  /* Independent Vowel */
   OT_MR   = 22, /* Medial Ra */
 //  OT_CM   = 17, /* Consonant Medial */
   OT_VAbv = 26,
   OT_VBlw = 27,
   OT_VPre = 28,
   OT_VPst = 29,
   OT_T    = 3,  /* Tone Marks */
 //  OT_A    = 10, /* Anusvara */
 };

 static inline void
 set_sea_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);

   /* Medial Ra */
   if (u == 0x1A55 || u == 0xAA34)
     cat = (indic_category_t) OT_MR;

   if (cat == OT_M)
   {
     switch ((int) pos)
     {
       case POS_PRE_C:	cat = (indic_category_t) OT_VPre; 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.sea_category() = (sea_category_t) cat;
   info.sea_position() = pos;
 }


 static void
 setup_masks_sea (const hb_ot_shape_plan_t *plan HB_UNUSED,
 		   hb_buffer_t              *buffer,
 		   hb_font_t                *font HB_UNUSED)
 {
   HB_BUFFER_ALLOCATE_VAR (buffer, sea_category);
   HB_BUFFER_ALLOCATE_VAR (buffer, sea_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_sea_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_sea_order (const hb_glyph_info_t *pa, const hb_glyph_info_t *pb)
 {
   int a = pa->sea_position();
   int b = pb->sea_position();

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


 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 = start;

   /* Reorder! */
   unsigned int i = start;
   for (; i < base; i++)
     info[i].sea_position() = POS_PRE_C;
   if (i < end)
   {
     info[i].sea_position() = POS_BASE_C;
     i++;
   }
   for (; i < end; i++)
   {
     if (info[i].sea_category() == OT_MR) /* Pre-base reordering */
     {
       info[i].sea_position() = POS_PRE_C;
       continue;
     }
     if (info[i].sea_position() < POS_BASE_C) /* Left matra */
     {
       continue;
     }

     info[i].sea_position() = POS_AFTER_MAIN;
   }

   buffer->merge_clusters (start, end);
   /* Sit tight, rock 'n roll! */
   hb_bubble_sort (info + start, end - start, compare_sea_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_sea_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_sea_cluster:	initial_reordering_non_sea_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_sea_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, sea_category);
   HB_BUFFER_DEALLOCATE_VAR (buffer, sea_position);
 }


 static hb_ot_shape_normalization_mode_t
 normalization_preference_sea (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_sea =
 {
   "sea",
   collect_features_sea,
   override_features_sea,
   NULL, /* data_create */
   NULL, /* data_destroy */
   NULL, /* preprocess_text */
   normalization_preference_sea,
   NULL, /* decompose */
   NULL, /* compose */
   setup_masks_sea,
   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 sea_category() complex_var_u8_0() /* indic_category_t */
	#define sea_position() complex_var_u8_1() /* indic_position_t */


	/*
	* South-East Asian shaper.
	* Loosely based on the Myanmar spec / shaper.
	* There is no OpenType spec for this.
	*/

	static const hb_tag_t
	sea_features[] =
	{
	/*
	* Basic features.
	* These features are applied in order, one at a time, after initial_reordering.
	*/
	HB_TAG('p','r','e','f'),
	HB_TAG('a','b','v','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 sea_features array.
	*/
	enum {
	_PREF,
	_ABVF,
	_BLWF,
	_PSTF,

	_PRES,
	_ABVS,
	_BLWS,
	_PSTS,
	_DIST,

	SEA_NUM_FEATURES,
	SEA_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_sea (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 < SEA_BASIC_FEATURES; i++) {
	map->add_bool_feature (sea_features[i]);
	map->add_gsub_pause (NULL);
	}
	map->add_gsub_pause (final_reordering);
	for (; i < SEA_NUM_FEATURES; i++) {
	map->add_bool_feature (sea_features[i]);
	}
	}

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


	enum syllable_type_t {
	consonant_syllable,
	broken_cluster,
	non_sea_cluster,
	};

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


	/* Note: This enum is duplicated in the -machine.rl source file.
	* Not sure how to avoid duplication. */
	enum sea_category_t {
	// OT_C = 1,
	OT_GB = 12, /* Generic Base XXX DOTTED CIRCLE only for now */
	// OT_H = 4, /* Halant */
	OT_IV = 2, /* Independent Vowel */
	OT_MR = 22, /* Medial Ra */
	// OT_CM = 17, /* Consonant Medial */
	OT_VAbv = 26,
	OT_VBlw = 27,
	OT_VPre = 28,
	OT_VPst = 29,
	OT_T = 3, /* Tone Marks */
	// OT_A = 10, /* Anusvara */
	};

	static inline void
	set_sea_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);

	/* Medial Ra */
	if (u == 0x1A55 \|\| u == 0xAA34)
	cat = (indic_category_t) OT_MR;

	if (cat == OT_M)
	{
	switch ((int) pos)
	{
	case POS_PRE_C: cat = (indic_category_t) OT_VPre; 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.sea_category() = (sea_category_t) cat;
	info.sea_position() = pos;
	}


	static void
	setup_masks_sea (const hb_ot_shape_plan_t *plan HB_UNUSED,
	hb_buffer_t *buffer,
	hb_font_t *font HB_UNUSED)
	{
	HB_BUFFER_ALLOCATE_VAR (buffer, sea_category);
	HB_BUFFER_ALLOCATE_VAR (buffer, sea_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_sea_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_sea_order (const hb_glyph_info_t pa, const hb_glyph_info_t pb)
	{
	int a = pa->sea_position();
	int b = pb->sea_position();

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


	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 = start;

	/* Reorder! */
	unsigned int i = start;
	for (; i < base; i++)
	info[i].sea_position() = POS_PRE_C;
	if (i < end)
	{
	info[i].sea_position() = POS_BASE_C;
	i++;
	}
	for (; i < end; i++)
	{
	if (info[i].sea_category() == OT_MR) /* Pre-base reordering */
	{
	info[i].sea_position() = POS_PRE_C;
	continue;
	}
	if (info[i].sea_position() < POS_BASE_C) /* Left matra */
	{
	continue;
	}

	info[i].sea_position() = POS_AFTER_MAIN;
	}

	buffer->merge_clusters (start, end);
	/* Sit tight, rock 'n roll! */
	hb_bubble_sort (info + start, end - start, compare_sea_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_sea_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_sea_cluster: initial_reordering_non_sea_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_sea_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, sea_category);
	HB_BUFFER_DEALLOCATE_VAR (buffer, sea_position);
	}


	static hb_ot_shape_normalization_mode_t
	normalization_preference_sea (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_sea =
	{
	"sea",
	collect_features_sea,
	override_features_sea,
	NULL, /* data_create */
	NULL, /* data_destroy */
	NULL, /* preprocess_text */
	normalization_preference_sea,
	NULL, /* decompose */
	NULL, /* compose */
	setup_masks_sea,
	HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF,
	false, /* fallback_position */
	};