src/OT/glyf/Glyph.hh - third_party/harfbuzz - Git at Google

 #ifndef OT_GLYF_GLYPH_HH
 #define OT_GLYF_GLYPH_HH


 #include "../../hb-open-type.hh"

 #include "GlyphHeader.hh"
 #include "SimpleGlyph.hh"
 #include "CompositeGlyph.hh"
 #include "VarCompositeGlyph.hh"
 #include "coord-setter.hh"


 namespace OT {

 struct glyf_accelerator_t;

 namespace glyf_impl {


 enum phantom_point_index_t
 {
   PHANTOM_LEFT   = 0,
   PHANTOM_RIGHT  = 1,
   PHANTOM_TOP    = 2,
   PHANTOM_BOTTOM = 3,
   PHANTOM_COUNT  = 4
 };

 struct Glyph
 {
   enum glyph_type_t {
     EMPTY,
     SIMPLE,
     COMPOSITE,
 #ifndef HB_NO_VAR_COMPOSITES
     VAR_COMPOSITE,
 #endif
   };

   public:
   composite_iter_t get_composite_iterator () const
   {
     if (type != COMPOSITE) return composite_iter_t ();
     return CompositeGlyph (*header, bytes).iter ();
   }
   var_composite_iter_t get_var_composite_iterator () const
   {
 #ifndef HB_NO_VAR_COMPOSITES
     if (type != VAR_COMPOSITE) return var_composite_iter_t ();
     return VarCompositeGlyph (*header, bytes).iter ();
 #else
     return var_composite_iter_t ();
 #endif
   }

   const hb_bytes_t trim_padding () const
   {
     switch (type) {
 #ifndef HB_NO_VAR_COMPOSITES
     case VAR_COMPOSITE: return VarCompositeGlyph (*header, bytes).trim_padding ();
 #endif
     case COMPOSITE: return CompositeGlyph (*header, bytes).trim_padding ();
     case SIMPLE:    return SimpleGlyph (*header, bytes).trim_padding ();
     case EMPTY:     return bytes;
     default:        return bytes;
     }
   }

   void drop_hints ()
   {
     switch (type) {
 #ifndef HB_NO_VAR_COMPOSITES
     case VAR_COMPOSITE: return; // No hinting
 #endif
     case COMPOSITE: CompositeGlyph (*header, bytes).drop_hints (); return;
     case SIMPLE:    SimpleGlyph (*header, bytes).drop_hints (); return;
     case EMPTY:     return;
     }
   }

   void set_overlaps_flag ()
   {
     switch (type) {
 #ifndef HB_NO_VAR_COMPOSITES
     case VAR_COMPOSITE: return; // No overlaps flag
 #endif
     case COMPOSITE: CompositeGlyph (*header, bytes).set_overlaps_flag (); return;
     case SIMPLE:    SimpleGlyph (*header, bytes).set_overlaps_flag (); return;
     case EMPTY:     return;
     }
   }

   void drop_hints_bytes (hb_bytes_t &dest_start, hb_bytes_t &dest_end) const
   {
     switch (type) {
 #ifndef HB_NO_VAR_COMPOSITES
     case VAR_COMPOSITE: return; // No hinting
 #endif
     case COMPOSITE: CompositeGlyph (*header, bytes).drop_hints_bytes (dest_start); return;
     case SIMPLE:    SimpleGlyph (*header, bytes).drop_hints_bytes (dest_start, dest_end); return;
     case EMPTY:     return;
     }
   }

   void update_mtx (const hb_subset_plan_t *plan,
                    int xMin, int xMax,
                    int yMin, int yMax,
                    const contour_point_vector_t &all_points) const
   {
     hb_codepoint_t new_gid = 0;
     if (!plan->new_gid_for_old_gid (gid, &new_gid))
       return;

     if (type != EMPTY)
     {
       plan->bounds_width_vec[new_gid] = xMax - xMin;
       plan->bounds_height_vec[new_gid] = yMax - yMin;
     }

     unsigned len = all_points.length;
     float leftSideX = all_points[len - 4].x;
     float rightSideX = all_points[len - 3].x;
     float topSideY = all_points[len - 2].y;
     float bottomSideY = all_points[len - 1].y;

     uint32_t hash = hb_hash (new_gid);

     signed hori_aw = roundf (rightSideX - leftSideX);
     if (hori_aw < 0) hori_aw = 0;
     int lsb = roundf (xMin - leftSideX);
     plan->hmtx_map.set_with_hash (new_gid, hash, hb_pair ((unsigned) hori_aw, lsb));
     //flag value should be computed using non-empty glyphs
     if (type != EMPTY && lsb != xMin)
       plan->head_maxp_info.allXMinIsLsb = false;

     signed vert_aw = roundf (topSideY - bottomSideY);
     if (vert_aw < 0) vert_aw = 0;
     int tsb = roundf (topSideY - yMax);
     plan->vmtx_map.set_with_hash (new_gid, hash, hb_pair ((unsigned) vert_aw, tsb));
   }

   bool compile_header_bytes (const hb_subset_plan_t *plan,
                              const contour_point_vector_t &all_points,
                              hb_bytes_t &dest_bytes /* OUT */) const
   {
     GlyphHeader *glyph_header = nullptr;
     if (!plan->pinned_at_default && type != EMPTY && all_points.length >= 4)
     {
       glyph_header = (GlyphHeader *) hb_calloc (1, GlyphHeader::static_size);
       if (unlikely (!glyph_header)) return false;
     }

     float xMin = 0, xMax = 0;
     float yMin = 0, yMax = 0;
     if (all_points.length > 4)
     {
       xMin = xMax = all_points[0].x;
       yMin = yMax = all_points[0].y;

       unsigned count = all_points.length - 4;
       for (unsigned i = 1; i < count; i++)
       {
 	float x = all_points[i].x;
 	float y = all_points[i].y;
 	xMin = hb_min (xMin, x);
 	xMax = hb_max (xMax, x);
 	yMin = hb_min (yMin, y);
 	yMax = hb_max (yMax, y);
       }
     }


     // These are destined for storage in a 16 bit field to clamp the values to
     // fit into a 16 bit signed integer.
     int rounded_xMin = hb_clamp (roundf (xMin), -32768.0f, 32767.0f);
     int rounded_xMax = hb_clamp (roundf (xMax), -32768.0f, 32767.0f);
     int rounded_yMin = hb_clamp (roundf (yMin), -32768.0f, 32767.0f);
     int rounded_yMax = hb_clamp (roundf (yMax), -32768.0f, 32767.0f);

     update_mtx (plan, rounded_xMin, rounded_xMax, rounded_yMin, rounded_yMax, all_points);

     if (type != EMPTY)
     {
       plan->head_maxp_info.xMin = hb_min (plan->head_maxp_info.xMin, rounded_xMin);
       plan->head_maxp_info.yMin = hb_min (plan->head_maxp_info.yMin, rounded_yMin);
       plan->head_maxp_info.xMax = hb_max (plan->head_maxp_info.xMax, rounded_xMax);
       plan->head_maxp_info.yMax = hb_max (plan->head_maxp_info.yMax, rounded_yMax);
     }

     /* when pinned at default, no need to compile glyph header
      * and for empty glyphs: all_points only include phantom points.
      * just update metrics and then return */
     if (!glyph_header)
       return true;

     glyph_header->numberOfContours = header->numberOfContours;

     glyph_header->xMin = rounded_xMin;
     glyph_header->yMin = rounded_yMin;
     glyph_header->xMax = rounded_xMax;
     glyph_header->yMax = rounded_yMax;

     dest_bytes = hb_bytes_t ((const char *)glyph_header, GlyphHeader::static_size);
     return true;
   }

   bool compile_bytes_with_deltas (const hb_subset_plan_t *plan,
                                   hb_font_t *font,
                                   const glyf_accelerator_t &glyf,
                                   hb_bytes_t &dest_start,  /* IN/OUT */
                                   hb_bytes_t &dest_end /* OUT */)
   {
     contour_point_vector_t all_points, points_with_deltas;
     unsigned composite_contours = 0;
     head_maxp_info_t *head_maxp_info_p = &plan->head_maxp_info;
     unsigned *composite_contours_p = &composite_contours;

     // don't compute head/maxp values when glyph has no contours(type is EMPTY)
     // also ignore .notdef glyph when --notdef-outline is not enabled
     if (type == EMPTY ||
         (gid == 0 && !(plan->flags & HB_SUBSET_FLAGS_NOTDEF_OUTLINE)))
     {
       head_maxp_info_p = nullptr;
       composite_contours_p = nullptr;
     }

     if (!get_points (font, glyf, all_points, &points_with_deltas, head_maxp_info_p, composite_contours_p, false, false))
       return false;

     // .notdef, set type to empty so we only update metrics and don't compile bytes for
     // it
     if (gid == 0 &&
         !(plan->flags & HB_SUBSET_FLAGS_NOTDEF_OUTLINE))
     {
       type = EMPTY;
       dest_start = hb_bytes_t ();
       dest_end = hb_bytes_t ();
     }

     //dont compile bytes when pinned at default, just recalculate bounds
     if (!plan->pinned_at_default)
     {
       switch (type)
       {
 #ifndef HB_NO_VAR_COMPOSITES
       case VAR_COMPOSITE:
 	// TODO
 	dest_end = hb_bytes_t ();
 	break;
 #endif

       case COMPOSITE:
         if (!CompositeGlyph (*header, bytes).compile_bytes_with_deltas (dest_start,
                                                                         points_with_deltas,
                                                                         dest_end))
           return false;
         break;
       case SIMPLE:
         if (!SimpleGlyph (*header, bytes).compile_bytes_with_deltas (all_points,
                                                                      plan->flags & HB_SUBSET_FLAGS_NO_HINTING,
                                                                      dest_end))
           return false;
         break;
       case EMPTY:
         /* set empty bytes for empty glyph
          * do not use source glyph's pointers */
         dest_start = hb_bytes_t ();
         dest_end = hb_bytes_t ();
         break;
       }
     }

     if (!compile_header_bytes (plan, all_points, dest_start))
     {
       dest_end.fini ();
       return false;
     }
     return true;
   }


   /* Note: Recursively calls itself.
    * all_points includes phantom points
    */
   template <typename accelerator_t>
   bool get_points (hb_font_t *font, const accelerator_t &glyf_accelerator,
 		   contour_point_vector_t &all_points /* OUT */,
 		   contour_point_vector_t *points_with_deltas = nullptr, /* OUT */
 		   head_maxp_info_t * head_maxp_info = nullptr, /* OUT */
 		   unsigned *composite_contours = nullptr, /* OUT */
 		   bool shift_points_hori = true,
 		   bool use_my_metrics = true,
 		   bool phantom_only = false,
 		   hb_array_t<int> coords = hb_array_t<int> (),
 		   hb_set_t *current_glyphs = nullptr,
 		   unsigned int depth = 0,
 		   unsigned *edge_count = nullptr) const
   {
     if (unlikely (depth > HB_MAX_NESTING_LEVEL)) return false;
     unsigned stack_edge_count = 0;
     if (!edge_count) edge_count = &stack_edge_count;
     if (unlikely (*edge_count > HB_GLYF_MAX_EDGE_COUNT)) return false;
     (*edge_count)++;

     hb_set_t current_glyphs_stack;
     if (current_glyphs == nullptr)
       current_glyphs = &current_glyphs_stack;

     if (head_maxp_info)
     {
       head_maxp_info->maxComponentDepth = hb_max (head_maxp_info->maxComponentDepth, depth);
     }

     if (!coords)
       coords = hb_array (font->coords, font->num_coords);

     contour_point_vector_t stack_points;
     contour_point_vector_t &points = type == SIMPLE ? all_points : stack_points;
     unsigned old_length = points.length;

     switch (type) {
     case SIMPLE:
       if (depth == 0 && head_maxp_info)
         head_maxp_info->maxContours = hb_max (head_maxp_info->maxContours, (unsigned) header->numberOfContours);
       if (depth > 0 && composite_contours)
         *composite_contours += (unsigned) header->numberOfContours;
       if (unlikely (!SimpleGlyph (*header, bytes).get_contour_points (all_points, phantom_only)))
 	return false;
       break;
     case COMPOSITE:
     {
       for (auto &item : get_composite_iterator ())
         if (unlikely (!item.get_points (points))) return false;
       break;
     }
 #ifndef HB_NO_VAR_COMPOSITES
     case VAR_COMPOSITE:
     {
       for (auto &item : get_var_composite_iterator ())
         if (unlikely (!item.get_points (points))) return false;
       break;
     }
 #endif
     case EMPTY:
       break;
     }

     /* Init phantom points */
     if (unlikely (!points.resize (points.length + PHANTOM_COUNT))) return false;
     hb_array_t<contour_point_t> phantoms = points.as_array ().sub_array (points.length - PHANTOM_COUNT, PHANTOM_COUNT);
     {
       int lsb = 0;
       int h_delta = glyf_accelerator.hmtx->get_leading_bearing_without_var_unscaled (gid, &lsb) ?
 		    (int) header->xMin - lsb : 0;
       HB_UNUSED int tsb = 0;
       int v_orig  = (int) header->yMax +
 #ifndef HB_NO_VERTICAL
 		    ((void) glyf_accelerator.vmtx->get_leading_bearing_without_var_unscaled (gid, &tsb), tsb)
 #else
 		    0
 #endif
 		    ;
       unsigned h_adv = glyf_accelerator.hmtx->get_advance_without_var_unscaled (gid);
       unsigned v_adv =
 #ifndef HB_NO_VERTICAL
 		       glyf_accelerator.vmtx->get_advance_without_var_unscaled (gid)
 #else
 		       - font->face->get_upem ()
 #endif
 		       ;
       phantoms[PHANTOM_LEFT].x = h_delta;
       phantoms[PHANTOM_RIGHT].x = (int) h_adv + h_delta;
       phantoms[PHANTOM_TOP].y = v_orig;
       phantoms[PHANTOM_BOTTOM].y = v_orig - (int) v_adv;
     }

 #ifndef HB_NO_VAR
     if (coords)
       glyf_accelerator.gvar->apply_deltas_to_points (gid,
 						     coords,
 						     points.as_array ().sub_array (old_length),
 						     phantom_only && type == SIMPLE);
 #endif

     // mainly used by CompositeGlyph calculating new X/Y offset value so no need to extend it
     // with child glyphs' points
     if (points_with_deltas != nullptr && depth == 0 && type == COMPOSITE)
     {
       if (unlikely (!points_with_deltas->resize (points.length))) return false;
       *points_with_deltas = points;
     }

     switch (type) {
     case SIMPLE:
       if (depth == 0 && head_maxp_info)
         head_maxp_info->maxPoints = hb_max (head_maxp_info->maxPoints, all_points.length - old_length - 4);
       break;
     case COMPOSITE:
     {
       unsigned int comp_index = 0;
       for (auto &item : get_composite_iterator ())
       {
 	hb_codepoint_t item_gid = item.get_gid ();

         if (unlikely (current_glyphs->has (item_gid)))
 	  continue;

 	current_glyphs->add (item_gid);

 	unsigned old_count = all_points.length;

 	if (unlikely ((!phantom_only || (use_my_metrics && item.is_use_my_metrics ())) &&
 		      !glyf_accelerator.glyph_for_gid (item_gid)
 				       .get_points (font,
 						    glyf_accelerator,
 						    all_points,
 						    points_with_deltas,
 						    head_maxp_info,
 						    composite_contours,
 						    shift_points_hori,
 						    use_my_metrics,
 						    phantom_only,
 						    coords,
 						    current_glyphs,
 						    depth + 1,
 						    edge_count)))
 	{
 	  current_glyphs->del (item_gid);
 	  return false;
 	}

 	auto comp_points = all_points.as_array ().sub_array (old_count);

 	/* Copy phantom points from component if USE_MY_METRICS flag set */
 	if (use_my_metrics && item.is_use_my_metrics ())
 	  for (unsigned int i = 0; i < PHANTOM_COUNT; i++)
 	    phantoms[i] = comp_points[comp_points.length - PHANTOM_COUNT + i];

 	if (comp_points) // Empty in case of phantom_only
 	{
 	  float matrix[4];
 	  contour_point_t default_trans;
 	  item.get_transformation (matrix, default_trans);

 	  /* Apply component transformation & translation (with deltas applied) */
 	  item.transform_points (comp_points, matrix, points[comp_index]);
 	}

 	if (item.is_anchored () && !phantom_only)
 	{
 	  unsigned int p1, p2;
 	  item.get_anchor_points (p1, p2);
 	  if (likely (p1 < all_points.length && p2 < comp_points.length))
 	  {
 	    contour_point_t delta;
 	    delta.init (all_points[p1].x - comp_points[p2].x,
 			all_points[p1].y - comp_points[p2].y);

 	    item.translate (delta, comp_points);
 	  }
 	}

 	all_points.resize (all_points.length - PHANTOM_COUNT);

 	if (all_points.length > HB_GLYF_MAX_POINTS)
 	{
 	  current_glyphs->del (item_gid);
 	  return false;
 	}

 	comp_index++;
         current_glyphs->del (item_gid);
       }

       if (head_maxp_info && depth == 0)
       {
         if (composite_contours)
           head_maxp_info->maxCompositeContours = hb_max (head_maxp_info->maxCompositeContours, *composite_contours);
         head_maxp_info->maxCompositePoints = hb_max (head_maxp_info->maxCompositePoints, all_points.length);
         head_maxp_info->maxComponentElements = hb_max (head_maxp_info->maxComponentElements, comp_index);
       }
       all_points.extend (phantoms);
     } break;
 #ifndef HB_NO_VAR_COMPOSITES
     case VAR_COMPOSITE:
     {
       hb_array_t<contour_point_t> points_left = points.as_array ();
       for (auto &item : get_var_composite_iterator ())
       {
 	hb_codepoint_t item_gid = item.get_gid ();

         if (unlikely (current_glyphs->has (item_gid)))
 	  continue;

 	current_glyphs->add (item_gid);

 	unsigned item_num_points = item.get_num_points ();
 	hb_array_t<contour_point_t> record_points = points_left.sub_array (0, item_num_points);
 	assert (record_points.length == item_num_points);

 	auto component_coords = coords;
 	/* Copying coords is expensive; so we have put an arbitrary
 	 * limit on the max number of coords for now. */
 	if (item.is_reset_unspecified_axes () ||
 	    coords.length > HB_GLYF_VAR_COMPOSITE_MAX_AXES)
 	  component_coords = hb_array<int> ();

 	coord_setter_t coord_setter (component_coords);
 	item.set_variations (coord_setter, record_points);

 	unsigned old_count = all_points.length;

 	if (unlikely ((!phantom_only || (use_my_metrics && item.is_use_my_metrics ())) &&
 		      !glyf_accelerator.glyph_for_gid (item_gid)
 				       .get_points (font,
 						    glyf_accelerator,
 						    all_points,
 						    points_with_deltas,
 						    head_maxp_info,
 						    nullptr,
 						    shift_points_hori,
 						    use_my_metrics,
 						    phantom_only,
 						    coord_setter.get_coords (),
 						    current_glyphs,
 						    depth + 1,
 						    edge_count)))
 	{
 	  current_glyphs->del (item_gid);
 	  return false;
 	}

 	auto comp_points = all_points.as_array ().sub_array (old_count);

 	/* Apply component transformation */
 	if (comp_points) // Empty in case of phantom_only
 	  item.transform_points (record_points, comp_points);

 	/* Copy phantom points from component if USE_MY_METRICS flag set */
 	if (use_my_metrics && item.is_use_my_metrics ())
 	  for (unsigned int i = 0; i < PHANTOM_COUNT; i++)
 	    phantoms[i] = comp_points[comp_points.length - PHANTOM_COUNT + i];

 	all_points.resize (all_points.length - PHANTOM_COUNT);

 	if (all_points.length > HB_GLYF_MAX_POINTS)
 	{
 	  current_glyphs->del (item_gid);
 	  return false;
 	}

 	points_left += item_num_points;

         current_glyphs->del (item_gid);
       }
       all_points.extend (phantoms);
     } break;
 #endif
     case EMPTY:
       all_points.extend (phantoms);
       break;
     }

     if (depth == 0 && shift_points_hori) /* Apply at top level */
     {
       /* Undocumented rasterizer behavior:
        * Shift points horizontally by the updated left side bearing
        */
       int v = -phantoms[PHANTOM_LEFT].x;
       if (v)
         for (auto &point : all_points)
 	  point.x += v;
     }

     return !all_points.in_error ();
   }

   bool get_extents_without_var_scaled (hb_font_t *font, const glyf_accelerator_t &glyf_accelerator,
 				       hb_glyph_extents_t *extents) const
   {
     if (type == EMPTY) return true; /* Empty glyph; zero extents. */
     return header->get_extents_without_var_scaled (font, glyf_accelerator, gid, extents);
   }

   hb_bytes_t get_bytes () const { return bytes; }
   glyph_type_t get_type () const { return type; }
   const GlyphHeader *get_header () const { return header; }

   Glyph () : bytes (),
              header (bytes.as<GlyphHeader> ()),
              gid (-1),
              type(EMPTY)
   {}

   Glyph (hb_bytes_t bytes_,
 	 hb_codepoint_t gid_ = (unsigned) -1) : bytes (bytes_),
                                                 header (bytes.as<GlyphHeader> ()),
                                                 gid (gid_)
   {
     int num_contours = header->numberOfContours;
     if (unlikely (num_contours == 0)) type = EMPTY;
     else if (num_contours > 0) type = SIMPLE;
     else if (num_contours == -1) type = COMPOSITE;
 #ifndef HB_NO_VAR_COMPOSITES
     else if (num_contours == -2) type = VAR_COMPOSITE;
 #endif
     else type = EMPTY; // Spec deviation; Spec says COMPOSITE, but not seen in the wild.
   }

   protected:
   hb_bytes_t bytes;
   const GlyphHeader *header;
   hb_codepoint_t gid;
   glyph_type_t type;
 };


 } /* namespace glyf_impl */
 } /* namespace OT */


 #endif /* OT_GLYF_GLYPH_HH */
	#ifndef OT_GLYF_GLYPH_HH
	#define OT_GLYF_GLYPH_HH


	#include "../../hb-open-type.hh"

	#include "GlyphHeader.hh"
	#include "SimpleGlyph.hh"
	#include "CompositeGlyph.hh"
	#include "VarCompositeGlyph.hh"
	#include "coord-setter.hh"


	namespace OT {

	struct glyf_accelerator_t;

	namespace glyf_impl {


	enum phantom_point_index_t
	{
	PHANTOM_LEFT = 0,
	PHANTOM_RIGHT = 1,
	PHANTOM_TOP = 2,
	PHANTOM_BOTTOM = 3,
	PHANTOM_COUNT = 4
	};

	struct Glyph
	{
	enum glyph_type_t {
	EMPTY,
	SIMPLE,
	COMPOSITE,
	#ifndef HB_NO_VAR_COMPOSITES
	VAR_COMPOSITE,
	#endif
	};

	public:
	composite_iter_t get_composite_iterator () const
	{
	if (type != COMPOSITE) return composite_iter_t ();
	return CompositeGlyph (*header, bytes).iter ();
	}
	var_composite_iter_t get_var_composite_iterator () const
	{
	#ifndef HB_NO_VAR_COMPOSITES
	if (type != VAR_COMPOSITE) return var_composite_iter_t ();
	return VarCompositeGlyph (*header, bytes).iter ();
	#else
	return var_composite_iter_t ();
	#endif
	}

	const hb_bytes_t trim_padding () const
	{
	switch (type) {
	#ifndef HB_NO_VAR_COMPOSITES
	case VAR_COMPOSITE: return VarCompositeGlyph (*header, bytes).trim_padding ();
	#endif
	case COMPOSITE: return CompositeGlyph (*header, bytes).trim_padding ();
	case SIMPLE: return SimpleGlyph (*header, bytes).trim_padding ();
	case EMPTY: return bytes;
	default: return bytes;
	}
	}

	void drop_hints ()
	{
	switch (type) {
	#ifndef HB_NO_VAR_COMPOSITES
	case VAR_COMPOSITE: return; // No hinting
	#endif
	case COMPOSITE: CompositeGlyph (*header, bytes).drop_hints (); return;
	case SIMPLE: SimpleGlyph (*header, bytes).drop_hints (); return;
	case EMPTY: return;
	}
	}

	void set_overlaps_flag ()
	{
	switch (type) {
	#ifndef HB_NO_VAR_COMPOSITES
	case VAR_COMPOSITE: return; // No overlaps flag
	#endif
	case COMPOSITE: CompositeGlyph (*header, bytes).set_overlaps_flag (); return;
	case SIMPLE: SimpleGlyph (*header, bytes).set_overlaps_flag (); return;
	case EMPTY: return;
	}
	}

	void drop_hints_bytes (hb_bytes_t &dest_start, hb_bytes_t &dest_end) const
	{
	switch (type) {
	#ifndef HB_NO_VAR_COMPOSITES
	case VAR_COMPOSITE: return; // No hinting
	#endif
	case COMPOSITE: CompositeGlyph (*header, bytes).drop_hints_bytes (dest_start); return;
	case SIMPLE: SimpleGlyph (*header, bytes).drop_hints_bytes (dest_start, dest_end); return;
	case EMPTY: return;
	}
	}

	void update_mtx (const hb_subset_plan_t *plan,
	int xMin, int xMax,
	int yMin, int yMax,
	const contour_point_vector_t &all_points) const
	{
	hb_codepoint_t new_gid = 0;
	if (!plan->new_gid_for_old_gid (gid, &new_gid))
	return;

	if (type != EMPTY)
	{
	plan->bounds_width_vec[new_gid] = xMax - xMin;
	plan->bounds_height_vec[new_gid] = yMax - yMin;
	}

	unsigned len = all_points.length;
	float leftSideX = all_points[len - 4].x;
	float rightSideX = all_points[len - 3].x;
	float topSideY = all_points[len - 2].y;
	float bottomSideY = all_points[len - 1].y;

	uint32_t hash = hb_hash (new_gid);

	signed hori_aw = roundf (rightSideX - leftSideX);
	if (hori_aw < 0) hori_aw = 0;
	int lsb = roundf (xMin - leftSideX);
	plan->hmtx_map.set_with_hash (new_gid, hash, hb_pair ((unsigned) hori_aw, lsb));
	//flag value should be computed using non-empty glyphs
	if (type != EMPTY && lsb != xMin)
	plan->head_maxp_info.allXMinIsLsb = false;

	signed vert_aw = roundf (topSideY - bottomSideY);
	if (vert_aw < 0) vert_aw = 0;
	int tsb = roundf (topSideY - yMax);
	plan->vmtx_map.set_with_hash (new_gid, hash, hb_pair ((unsigned) vert_aw, tsb));
	}

	bool compile_header_bytes (const hb_subset_plan_t *plan,
	const contour_point_vector_t &all_points,
	hb_bytes_t &dest_bytes /* OUT */) const
	{
	GlyphHeader *glyph_header = nullptr;
	if (!plan->pinned_at_default && type != EMPTY && all_points.length >= 4)
	{
	glyph_header = (GlyphHeader *) hb_calloc (1, GlyphHeader::static_size);
	if (unlikely (!glyph_header)) return false;
	}

	float xMin = 0, xMax = 0;
	float yMin = 0, yMax = 0;
	if (all_points.length > 4)
	{
	xMin = xMax = all_points[0].x;
	yMin = yMax = all_points[0].y;

	unsigned count = all_points.length - 4;
	for (unsigned i = 1; i < count; i++)
	{
	float x = all_points[i].x;
	float y = all_points[i].y;
	xMin = hb_min (xMin, x);
	xMax = hb_max (xMax, x);
	yMin = hb_min (yMin, y);
	yMax = hb_max (yMax, y);
	}
	}


	// These are destined for storage in a 16 bit field to clamp the values to
	// fit into a 16 bit signed integer.
	int rounded_xMin = hb_clamp (roundf (xMin), -32768.0f, 32767.0f);
	int rounded_xMax = hb_clamp (roundf (xMax), -32768.0f, 32767.0f);
	int rounded_yMin = hb_clamp (roundf (yMin), -32768.0f, 32767.0f);
	int rounded_yMax = hb_clamp (roundf (yMax), -32768.0f, 32767.0f);

	update_mtx (plan, rounded_xMin, rounded_xMax, rounded_yMin, rounded_yMax, all_points);

	if (type != EMPTY)
	{
	plan->head_maxp_info.xMin = hb_min (plan->head_maxp_info.xMin, rounded_xMin);
	plan->head_maxp_info.yMin = hb_min (plan->head_maxp_info.yMin, rounded_yMin);
	plan->head_maxp_info.xMax = hb_max (plan->head_maxp_info.xMax, rounded_xMax);
	plan->head_maxp_info.yMax = hb_max (plan->head_maxp_info.yMax, rounded_yMax);
	}

	/* when pinned at default, no need to compile glyph header
	* and for empty glyphs: all_points only include phantom points.
	* just update metrics and then return */
	if (!glyph_header)
	return true;

	glyph_header->numberOfContours = header->numberOfContours;

	glyph_header->xMin = rounded_xMin;
	glyph_header->yMin = rounded_yMin;
	glyph_header->xMax = rounded_xMax;
	glyph_header->yMax = rounded_yMax;

	dest_bytes = hb_bytes_t ((const char *)glyph_header, GlyphHeader::static_size);
	return true;
	}

	bool compile_bytes_with_deltas (const hb_subset_plan_t *plan,
	hb_font_t *font,
	const glyf_accelerator_t &glyf,
	hb_bytes_t &dest_start, /* IN/OUT */
	hb_bytes_t &dest_end /* OUT */)
	{
	contour_point_vector_t all_points, points_with_deltas;
	unsigned composite_contours = 0;
	head_maxp_info_t *head_maxp_info_p = &plan->head_maxp_info;
	unsigned *composite_contours_p = &composite_contours;

	// don't compute head/maxp values when glyph has no contours(type is EMPTY)
	// also ignore .notdef glyph when --notdef-outline is not enabled
	if (type == EMPTY \|\|
	(gid == 0 && !(plan->flags & HB_SUBSET_FLAGS_NOTDEF_OUTLINE)))
	{
	head_maxp_info_p = nullptr;
	composite_contours_p = nullptr;
	}

	if (!get_points (font, glyf, all_points, &points_with_deltas, head_maxp_info_p, composite_contours_p, false, false))
	return false;

	// .notdef, set type to empty so we only update metrics and don't compile bytes for
	// it
	if (gid == 0 &&
	!(plan->flags & HB_SUBSET_FLAGS_NOTDEF_OUTLINE))
	{
	type = EMPTY;
	dest_start = hb_bytes_t ();
	dest_end = hb_bytes_t ();
	}

	//dont compile bytes when pinned at default, just recalculate bounds
	if (!plan->pinned_at_default)
	{
	switch (type)
	{
	#ifndef HB_NO_VAR_COMPOSITES
	case VAR_COMPOSITE:
	// TODO
	dest_end = hb_bytes_t ();
	break;
	#endif

	case COMPOSITE:
	if (!CompositeGlyph (*header, bytes).compile_bytes_with_deltas (dest_start,
	points_with_deltas,
	dest_end))
	return false;
	break;
	case SIMPLE:
	if (!SimpleGlyph (*header, bytes).compile_bytes_with_deltas (all_points,
	plan->flags & HB_SUBSET_FLAGS_NO_HINTING,
	dest_end))
	return false;
	break;
	case EMPTY:
	/* set empty bytes for empty glyph
	* do not use source glyph's pointers */
	dest_start = hb_bytes_t ();
	dest_end = hb_bytes_t ();
	break;
	}
	}

	if (!compile_header_bytes (plan, all_points, dest_start))
	{
	dest_end.fini ();
	return false;
	}
	return true;
	}


	/* Note: Recursively calls itself.
	* all_points includes phantom points
	*/
	template <typename accelerator_t>
	bool get_points (hb_font_t *font, const accelerator_t &glyf_accelerator,
	contour_point_vector_t &all_points /* OUT */,
	contour_point_vector_t points_with_deltas = nullptr, / OUT */
	head_maxp_info_t * head_maxp_info = nullptr, /* OUT */
	unsigned composite_contours = nullptr, / OUT */
	bool shift_points_hori = true,
	bool use_my_metrics = true,
	bool phantom_only = false,
	hb_array_t<int> coords = hb_array_t<int> (),
	hb_set_t *current_glyphs = nullptr,
	unsigned int depth = 0,
	unsigned *edge_count = nullptr) const
	{
	if (unlikely (depth > HB_MAX_NESTING_LEVEL)) return false;
	unsigned stack_edge_count = 0;
	if (!edge_count) edge_count = &stack_edge_count;
	if (unlikely (*edge_count > HB_GLYF_MAX_EDGE_COUNT)) return false;
	(*edge_count)++;

	hb_set_t current_glyphs_stack;
	if (current_glyphs == nullptr)
	current_glyphs = &current_glyphs_stack;

	if (head_maxp_info)
	{
	head_maxp_info->maxComponentDepth = hb_max (head_maxp_info->maxComponentDepth, depth);
	}

	if (!coords)
	coords = hb_array (font->coords, font->num_coords);

	contour_point_vector_t stack_points;
	contour_point_vector_t &points = type == SIMPLE ? all_points : stack_points;
	unsigned old_length = points.length;

	switch (type) {
	case SIMPLE:
	if (depth == 0 && head_maxp_info)
	head_maxp_info->maxContours = hb_max (head_maxp_info->maxContours, (unsigned) header->numberOfContours);
	if (depth > 0 && composite_contours)
	*composite_contours += (unsigned) header->numberOfContours;
	if (unlikely (!SimpleGlyph (*header, bytes).get_contour_points (all_points, phantom_only)))
	return false;
	break;
	case COMPOSITE:
	{
	for (auto &item : get_composite_iterator ())
	if (unlikely (!item.get_points (points))) return false;
	break;
	}
	#ifndef HB_NO_VAR_COMPOSITES
	case VAR_COMPOSITE:
	{
	for (auto &item : get_var_composite_iterator ())
	if (unlikely (!item.get_points (points))) return false;
	break;
	}
	#endif
	case EMPTY:
	break;
	}

	/* Init phantom points */
	if (unlikely (!points.resize (points.length + PHANTOM_COUNT))) return false;
	hb_array_t<contour_point_t> phantoms = points.as_array ().sub_array (points.length - PHANTOM_COUNT, PHANTOM_COUNT);
	{
	int lsb = 0;
	int h_delta = glyf_accelerator.hmtx->get_leading_bearing_without_var_unscaled (gid, &lsb) ?
	(int) header->xMin - lsb : 0;
	HB_UNUSED int tsb = 0;
	int v_orig = (int) header->yMax +
	#ifndef HB_NO_VERTICAL
	((void) glyf_accelerator.vmtx->get_leading_bearing_without_var_unscaled (gid, &tsb), tsb)
	#else
	0
	#endif
	;
	unsigned h_adv = glyf_accelerator.hmtx->get_advance_without_var_unscaled (gid);
	unsigned v_adv =
	#ifndef HB_NO_VERTICAL
	glyf_accelerator.vmtx->get_advance_without_var_unscaled (gid)
	#else
	- font->face->get_upem ()
	#endif
	;
	phantoms[PHANTOM_LEFT].x = h_delta;
	phantoms[PHANTOM_RIGHT].x = (int) h_adv + h_delta;
	phantoms[PHANTOM_TOP].y = v_orig;
	phantoms[PHANTOM_BOTTOM].y = v_orig - (int) v_adv;
	}

	#ifndef HB_NO_VAR
	if (coords)
	glyf_accelerator.gvar->apply_deltas_to_points (gid,
	coords,
	points.as_array ().sub_array (old_length),
	phantom_only && type == SIMPLE);
	#endif

	// mainly used by CompositeGlyph calculating new X/Y offset value so no need to extend it
	// with child glyphs' points
	if (points_with_deltas != nullptr && depth == 0 && type == COMPOSITE)
	{
	if (unlikely (!points_with_deltas->resize (points.length))) return false;
	*points_with_deltas = points;
	}

	switch (type) {
	case SIMPLE:
	if (depth == 0 && head_maxp_info)
	head_maxp_info->maxPoints = hb_max (head_maxp_info->maxPoints, all_points.length - old_length - 4);
	break;
	case COMPOSITE:
	{
	unsigned int comp_index = 0;
	for (auto &item : get_composite_iterator ())
	{
	hb_codepoint_t item_gid = item.get_gid ();

	if (unlikely (current_glyphs->has (item_gid)))
	continue;

	current_glyphs->add (item_gid);

	unsigned old_count = all_points.length;

	if (unlikely ((!phantom_only \|\| (use_my_metrics && item.is_use_my_metrics ())) &&
	!glyf_accelerator.glyph_for_gid (item_gid)
	.get_points (font,
	glyf_accelerator,
	all_points,
	points_with_deltas,
	head_maxp_info,
	composite_contours,
	shift_points_hori,
	use_my_metrics,
	phantom_only,
	coords,
	current_glyphs,
	depth + 1,
	edge_count)))
	{
	current_glyphs->del (item_gid);
	return false;
	}

	auto comp_points = all_points.as_array ().sub_array (old_count);

	/* Copy phantom points from component if USE_MY_METRICS flag set */
	if (use_my_metrics && item.is_use_my_metrics ())
	for (unsigned int i = 0; i < PHANTOM_COUNT; i++)
	phantoms[i] = comp_points[comp_points.length - PHANTOM_COUNT + i];

	if (comp_points) // Empty in case of phantom_only
	{
	float matrix[4];
	contour_point_t default_trans;
	item.get_transformation (matrix, default_trans);

	/* Apply component transformation & translation (with deltas applied) */
	item.transform_points (comp_points, matrix, points[comp_index]);
	}

	if (item.is_anchored () && !phantom_only)
	{
	unsigned int p1, p2;
	item.get_anchor_points (p1, p2);
	if (likely (p1 < all_points.length && p2 < comp_points.length))
	{
	contour_point_t delta;
	delta.init (all_points[p1].x - comp_points[p2].x,
	all_points[p1].y - comp_points[p2].y);

	item.translate (delta, comp_points);
	}
	}

	all_points.resize (all_points.length - PHANTOM_COUNT);

	if (all_points.length > HB_GLYF_MAX_POINTS)
	{
	current_glyphs->del (item_gid);
	return false;
	}

	comp_index++;
	current_glyphs->del (item_gid);
	}

	if (head_maxp_info && depth == 0)
	{
	if (composite_contours)
	head_maxp_info->maxCompositeContours = hb_max (head_maxp_info->maxCompositeContours, *composite_contours);
	head_maxp_info->maxCompositePoints = hb_max (head_maxp_info->maxCompositePoints, all_points.length);
	head_maxp_info->maxComponentElements = hb_max (head_maxp_info->maxComponentElements, comp_index);
	}
	all_points.extend (phantoms);
	} break;
	#ifndef HB_NO_VAR_COMPOSITES
	case VAR_COMPOSITE:
	{
	hb_array_t<contour_point_t> points_left = points.as_array ();
	for (auto &item : get_var_composite_iterator ())
	{
	hb_codepoint_t item_gid = item.get_gid ();

	if (unlikely (current_glyphs->has (item_gid)))
	continue;

	current_glyphs->add (item_gid);

	unsigned item_num_points = item.get_num_points ();
	hb_array_t<contour_point_t> record_points = points_left.sub_array (0, item_num_points);
	assert (record_points.length == item_num_points);

	auto component_coords = coords;
	/* Copying coords is expensive; so we have put an arbitrary
	* limit on the max number of coords for now. */
	if (item.is_reset_unspecified_axes () \|\|
	coords.length > HB_GLYF_VAR_COMPOSITE_MAX_AXES)
	component_coords = hb_array<int> ();

	coord_setter_t coord_setter (component_coords);
	item.set_variations (coord_setter, record_points);

	unsigned old_count = all_points.length;

	if (unlikely ((!phantom_only \|\| (use_my_metrics && item.is_use_my_metrics ())) &&
	!glyf_accelerator.glyph_for_gid (item_gid)
	.get_points (font,
	glyf_accelerator,
	all_points,
	points_with_deltas,
	head_maxp_info,
	nullptr,
	shift_points_hori,
	use_my_metrics,
	phantom_only,
	coord_setter.get_coords (),
	current_glyphs,
	depth + 1,
	edge_count)))
	{
	current_glyphs->del (item_gid);
	return false;
	}

	auto comp_points = all_points.as_array ().sub_array (old_count);

	/* Apply component transformation */
	if (comp_points) // Empty in case of phantom_only
	item.transform_points (record_points, comp_points);

	/* Copy phantom points from component if USE_MY_METRICS flag set */
	if (use_my_metrics && item.is_use_my_metrics ())
	for (unsigned int i = 0; i < PHANTOM_COUNT; i++)
	phantoms[i] = comp_points[comp_points.length - PHANTOM_COUNT + i];

	all_points.resize (all_points.length - PHANTOM_COUNT);

	if (all_points.length > HB_GLYF_MAX_POINTS)
	{
	current_glyphs->del (item_gid);
	return false;
	}

	points_left += item_num_points;

	current_glyphs->del (item_gid);
	}
	all_points.extend (phantoms);
	} break;
	#endif
	case EMPTY:
	all_points.extend (phantoms);
	break;
	}

	if (depth == 0 && shift_points_hori) /* Apply at top level */
	{
	/* Undocumented rasterizer behavior:
	* Shift points horizontally by the updated left side bearing
	*/
	int v = -phantoms[PHANTOM_LEFT].x;
	if (v)
	for (auto &point : all_points)
	point.x += v;
	}

	return !all_points.in_error ();
	}

	bool get_extents_without_var_scaled (hb_font_t *font, const glyf_accelerator_t &glyf_accelerator,
	hb_glyph_extents_t *extents) const
	{
	if (type == EMPTY) return true; /* Empty glyph; zero extents. */
	return header->get_extents_without_var_scaled (font, glyf_accelerator, gid, extents);
	}

	hb_bytes_t get_bytes () const { return bytes; }
	glyph_type_t get_type () const { return type; }
	const GlyphHeader *get_header () const { return header; }

	Glyph () : bytes (),
	header (bytes.as<GlyphHeader> ()),
	gid (-1),
	type(EMPTY)
	{}

	Glyph (hb_bytes_t bytes_,
	hb_codepoint_t gid_ = (unsigned) -1) : bytes (bytes_),
	header (bytes.as<GlyphHeader> ()),
	gid (gid_)
	{
	int num_contours = header->numberOfContours;
	if (unlikely (num_contours == 0)) type = EMPTY;
	else if (num_contours > 0) type = SIMPLE;
	else if (num_contours == -1) type = COMPOSITE;
	#ifndef HB_NO_VAR_COMPOSITES
	else if (num_contours == -2) type = VAR_COMPOSITE;
	#endif
	else type = EMPTY; // Spec deviation; Spec says COMPOSITE, but not seen in the wild.
	}

	protected:
	hb_bytes_t bytes;
	const GlyphHeader *header;
	hb_codepoint_t gid;
	glyph_type_t type;
	};


	} /* namespace glyf_impl */
	} /* namespace OT */


	#endif /* OT_GLYF_GLYPH_HH */