kc3-lang/harfbuzz/src/hb-kern.hh

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• Author : Ebrahim Byagowi
  Date : 2018-12-16 22:38:10
  Hash : b2ebaa9a
  Message : Remove redundant 'inline' from methods (#1483)

• src/hb-kern.hh

• /*
   * Copyright © 2017  Google, Inc.
   *
   *  This is part of HarfBuzz, a text shaping library.
   *
   * Permission is hereby granted, without written agreement and without
   * license or royalty fees, to use, copy, modify, and distribute this
   * software and its documentation for any purpose, provided that the
   * above copyright notice and the following two paragraphs appear in
   * all copies of this software.
   *
   * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
   * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
   * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
   * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
   * DAMAGE.
   *
   * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
   * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
   * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
   * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
   * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
   *
   * Google Author(s): Behdad Esfahbod
   */
  
  #ifndef HB_KERN_HH
  #define HB_KERN_HH
  
  #include "hb-open-type.hh"
  #include "hb-aat-layout-common.hh"
  #include "hb-ot-layout-gpos-table.hh"
  
  
  namespace OT {
  
  
  template <typename Driver>
  struct hb_kern_machine_t
  {
    hb_kern_machine_t (const Driver &driver_,
  		     bool crossStream_ = false) :
  		       driver (driver_),
  		       crossStream (crossStream_) {}
  
    HB_NO_SANITIZE_SIGNED_INTEGER_OVERFLOW
    void kern (hb_font_t   *font,
  	     hb_buffer_t *buffer,
  	     hb_mask_t    kern_mask,
  	     bool         scale = true) const
    {
      OT::hb_ot_apply_context_t c (1, font, buffer);
      c.set_lookup_mask (kern_mask);
      c.set_lookup_props (OT::LookupFlag::IgnoreMarks);
      OT::hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c.iter_input;
      skippy_iter.init (&c);
  
      bool horizontal = HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction);
      unsigned int count = buffer->len;
      hb_glyph_info_t *info = buffer->info;
      hb_glyph_position_t *pos = buffer->pos;
      for (unsigned int idx = 0; idx < count;)
      {
        if (!(info[idx].mask & kern_mask))
        {
  	idx++;
  	continue;
        }
  
        skippy_iter.reset (idx, 1);
        if (!skippy_iter.next ())
        {
  	idx++;
  	continue;
        }
  
        unsigned int i = idx;
        unsigned int j = skippy_iter.idx;
  
        hb_position_t kern = driver.get_kerning (info[i].codepoint,
  					       info[j].codepoint);
  
  
        if (likely (!kern))
          goto skip;
  
        if (horizontal)
        {
          if (scale)
  	  kern = font->em_scale_x (kern);
  	if (crossStream)
  	{
  	  pos[j].y_offset = kern;
  	  buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT;
  	}
  	else
  	{
  	  hb_position_t kern1 = kern >> 1;
  	  hb_position_t kern2 = kern - kern1;
  	  pos[i].x_advance += kern1;
  	  pos[j].x_advance += kern2;
  	  pos[j].x_offset += kern2;
  	}
        }
        else
        {
          if (scale)
  	  kern = font->em_scale_y (kern);
  	if (crossStream)
  	{
  	  pos[j].x_offset = kern;
  	  buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT;
  	}
  	else
  	{
  	  hb_position_t kern1 = kern >> 1;
  	  hb_position_t kern2 = kern - kern1;
  	  pos[i].y_advance += kern1;
  	  pos[j].y_advance += kern2;
  	  pos[j].y_offset += kern2;
  	}
        }
  
        buffer->unsafe_to_break (i, j + 1);
  
      skip:
        idx = skippy_iter.idx;
      }
    }
  
    const Driver &driver;
    bool crossStream;
  };
  
  
  } /* namespace OT */
  
  
  #endif /* HB_KERN_HH */