kc3-lang/harfbuzz/src/OT/glyf/Glyph.hh

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• Hash : 356d135e
  Author :
  Date : 2022-11-23T12:20:51
  

  [subset-glyf] Reduce roundf calls
  
  Saves 7% on MPLUS1-Variable/6000 benchmark.
  

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• src/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"
  
  
  namespace OT {
  
  struct glyf_accelerator_t;
  
  namespace glyf_impl {
  
  
  #ifndef HB_GLYF_MAX_POINTS
  #define HB_GLYF_MAX_POINTS 10000
  #endif
  
  
  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 };
  
    public:
    composite_iter_t get_composite_iterator () const
    {
      if (type != COMPOSITE) return composite_iter_t ();
      return CompositeGlyph (*header, bytes).iter ();
    }
  
    const hb_bytes_t trim_padding () const
    {
      switch (type) {
      case COMPOSITE: return CompositeGlyph (*header, bytes).trim_padding ();
      case SIMPLE:    return SimpleGlyph (*header, bytes).trim_padding ();
      default:        return bytes;
      }
    }
  
    void drop_hints ()
    {
      switch (type) {
      case COMPOSITE: CompositeGlyph (*header, bytes).drop_hints (); return;
      case SIMPLE:    SimpleGlyph (*header, bytes).drop_hints (); return;
      default:        return;
      }
    }
  
    void set_overlaps_flag ()
    {
      switch (type) {
      case COMPOSITE: CompositeGlyph (*header, bytes).set_overlaps_flag (); return;
      case SIMPLE:    SimpleGlyph (*header, bytes).set_overlaps_flag (); return;
      default:        return;
      }
    }
  
    void drop_hints_bytes (hb_bytes_t &dest_start, hb_bytes_t &dest_end) const
    {
      switch (type) {
      case COMPOSITE: CompositeGlyph (*header, bytes).drop_hints_bytes (dest_start); return;
      case SIMPLE:    SimpleGlyph (*header, bytes).drop_hints_bytes (dest_start, dest_end); return;
      default:        return;
      }
    }
  
    void update_mtx (const hb_subset_plan_t *plan,
                     int xMin, 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;
  
      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;
  
      int hori_aw = roundf (rightSideX - leftSideX);
      if (hori_aw < 0) hori_aw = 0;
      int lsb = roundf (xMin - leftSideX);
      plan->hmtx_map->set (new_gid, hb_pair (hori_aw, lsb));
  
      int vert_aw = roundf (topSideY - bottomSideY);
      if (vert_aw < 0) vert_aw = 0;
      int tsb = roundf (topSideY - yMax);
      plan->vmtx_map->set (new_gid, hb_pair (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 (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;
      }
  
      for (unsigned i = 1; i < all_points.length - 4; 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);
      }
  
      update_mtx (plan, roundf (xMin), roundf (yMax), all_points);
  
      /*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 = roundf (xMin);
      glyph_header->yMin = roundf (yMin);
      glyph_header->xMax = roundf (xMax);
      glyph_header->yMax = roundf (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, deltas;
      if (!get_points (font, glyf, all_points, &deltas, 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;
  
      switch (type) {
      case COMPOSITE:
        if (!CompositeGlyph (*header, bytes).compile_bytes_with_deltas (dest_start,
                                                                        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;
      default:
        /* 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 *deltas = nullptr, /* OUT */
  		   bool shift_points_hori = true,
  		   bool use_my_metrics = true,
  		   bool phantom_only = false,
  		   unsigned int depth = 0) const
    {
      if (unlikely (depth > HB_MAX_NESTING_LEVEL)) return false;
      contour_point_vector_t stack_points;
      bool inplace = type == SIMPLE && all_points.length == 0;
      /* Load into all_points if it's empty, as an optimization. */
      contour_point_vector_t &points = inplace ? all_points : stack_points;
  
      switch (type) {
      case COMPOSITE:
      {
        /* pseudo component points for each component in composite glyph */
        unsigned num_points = hb_len (CompositeGlyph (*header, bytes).iter ());
        if (unlikely (!points.resize (num_points))) return false;
        break;
      }
      case SIMPLE:
        if (unlikely (!SimpleGlyph (*header, bytes).get_contour_points (points, phantom_only)))
  	return false;
        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;
        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 = h_adv + h_delta;
        phantoms[PHANTOM_TOP].y = v_orig;
        phantoms[PHANTOM_BOTTOM].y = v_orig - (int) v_adv;
      }
  
      if (deltas != nullptr && depth == 0 && type == COMPOSITE)
      {
        if (unlikely (!deltas->resize (points.length))) return false;
        deltas->copy_vector (points);
      }
  
  #ifndef HB_NO_VAR
      glyf_accelerator.gvar->apply_deltas_to_points (gid, font, points.as_array ());
  #endif
  
      // mainly used by CompositeGlyph calculating new X/Y offset value so no need to extend it
      // with child glyphs' points
      if (deltas != nullptr && depth == 0 && type == COMPOSITE)
      {
        for (unsigned i = 0 ; i < points.length; i++)
        {
          deltas->arrayZ[i].x = points.arrayZ[i].x - deltas->arrayZ[i].x;
          deltas->arrayZ[i].y = points.arrayZ[i].y - deltas->arrayZ[i].y;
        }
      }
  
      switch (type) {
      case SIMPLE:
        if (!inplace)
  	all_points.extend (points.as_array ());
        break;
      case COMPOSITE:
      {
        contour_point_vector_t comp_points;
        unsigned int comp_index = 0;
        for (auto &item : get_composite_iterator ())
        {
          comp_points.reset ();
  	if (unlikely (!glyf_accelerator.glyph_for_gid (item.get_gid ())
  				       .get_points (font, glyf_accelerator, comp_points,
  						    deltas, shift_points_hori, use_my_metrics, phantom_only, depth + 1)))
  	  return false;
  
  	/* Apply component transformation & translation */
  	item.transform_points (comp_points);
  
  	/* Apply translation from gvar */
  	comp_points.translate (points[comp_index]);
  
  	if (item.is_anchored ())
  	{
  	  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);
  
  	    comp_points.translate (delta);
  	  }
  	}
  
  	/* 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 (all_points.length > HB_GLYF_MAX_POINTS)
  	  return false;
  
  	all_points.extend (comp_points.as_array ().sub_array (0, comp_points.length - PHANTOM_COUNT));
  
  	comp_index++;
        }
  
        all_points.extend (phantoms);
      } break;
      default:
        all_points.extend (phantoms);
      }
  
      if (depth == 0 && shift_points_hori) /* Apply at top level */
      {
        /* Undocumented rasterizer behavior:
         * Shift points horizontally by the updated left side bearing
         */
        contour_point_t delta;
        delta.init (-phantoms[PHANTOM_LEFT].x, 0.f);
        if (delta.x) all_points.translate (delta);
      }
  
      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 () : 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 type = COMPOSITE; /* negative numbers */
    }
  
    protected:
    hb_bytes_t bytes;
    const GlyphHeader *header;
    hb_codepoint_t gid;
    unsigned type;
  };
  
  
  } /* namespace glyf_impl */
  } /* namespace OT */
  
  
  #endif /* OT_GLYF_GLYPH_HH */
  

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