kc3-lang/harfbuzz/src/hb-ot-cff2-table.cc

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• Hash : dc45f225
  Author :
  Date : 2019-10-08T23:27:37
  

  [ot-metrics] Don't use mixed scaled and not scaled for generating extents
  

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• src/hb-ot-cff2-table.cc

• /*
   * Copyright © 2018 Adobe 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.
   *
   * Adobe Author(s): Michiharu Ariza
   */
  
  #include "hb.hh"
  
  #ifndef HB_NO_OT_FONT_CFF
  
  #include "hb-ot-cff2-table.hh"
  #include "hb-cff2-interp-cs.hh"
  
  using namespace CFF;
  
  struct cff2_extents_param_t
  {
    void init ()
    {
      path_open = false;
      min_x.set_int (INT_MAX);
      min_y.set_int (INT_MAX);
      max_x.set_int (INT_MIN);
      max_y.set_int (INT_MIN);
    }
  
    void   start_path ()       { path_open = true; }
    void     end_path ()       { path_open = false; }
    bool is_path_open () const { return path_open; }
  
    void update_bounds (const point_t &pt)
    {
      if (pt.x < min_x) min_x = pt.x;
      if (pt.x > max_x) max_x = pt.x;
      if (pt.y < min_y) min_y = pt.y;
      if (pt.y > max_y) max_y = pt.y;
    }
  
    bool  path_open;
    number_t min_x;
    number_t min_y;
    number_t max_x;
    number_t max_y;
  };
  
  struct cff2_path_procs_extents_t : path_procs_t<cff2_path_procs_extents_t, cff2_cs_interp_env_t, cff2_extents_param_t>
  {
    static void moveto (cff2_cs_interp_env_t &env, cff2_extents_param_t& param, const point_t &pt)
    {
      param.end_path ();
      env.moveto (pt);
    }
  
    static void line (cff2_cs_interp_env_t &env, cff2_extents_param_t& param, const point_t &pt1)
    {
      if (!param.is_path_open ())
      {
        param.start_path ();
        param.update_bounds (env.get_pt ());
      }
      env.moveto (pt1);
      param.update_bounds (env.get_pt ());
    }
  
    static void curve (cff2_cs_interp_env_t &env, cff2_extents_param_t& param, const point_t &pt1, const point_t &pt2, const point_t &pt3)
    {
      if (!param.is_path_open ())
      {
        param.start_path ();
        param.update_bounds (env.get_pt ());
      }
      /* include control points */
      param.update_bounds (pt1);
      param.update_bounds (pt2);
      env.moveto (pt3);
      param.update_bounds (env.get_pt ());
    }
  };
  
  struct cff2_cs_opset_extents_t : cff2_cs_opset_t<cff2_cs_opset_extents_t, cff2_extents_param_t, cff2_path_procs_extents_t> {};
  
  bool OT::cff2::accelerator_t::get_extents (hb_font_t *font,
  					   hb_codepoint_t glyph,
  					   hb_glyph_extents_t *extents) const
  {
  #ifdef HB_NO_OT_FONT_CFF
    /* XXX Remove check when this code moves to .hh file. */
    return true;
  #endif
  
    if (unlikely (!is_valid () || (glyph >= num_glyphs))) return false;
  
    unsigned int fd = fdSelect->get_fd (glyph);
    cff2_cs_interpreter_t<cff2_cs_opset_extents_t, cff2_extents_param_t> interp;
    const byte_str_t str = (*charStrings)[glyph];
    interp.env.init (str, *this, fd, font->coords, font->num_coords);
    cff2_extents_param_t  param;
    param.init ();
    if (unlikely (!interp.interpret (param))) return false;
  
    if (param.min_x >= param.max_x)
    {
      extents->width = 0;
      extents->x_bearing = 0;
    }
    else
    {
      extents->x_bearing = font->em_scalef_x (param.min_x.to_real ());
      extents->width = font->em_scalef_x (param.max_x.to_real () - param.min_x.to_real ());
    }
    if (param.min_y >= param.max_y)
    {
      extents->height = 0;
      extents->y_bearing = 0;
    }
    else
    {
      extents->y_bearing = font->em_scalef_y (param.max_y.to_real ());
      extents->height = font->em_scalef_y (param.min_y.to_real () - param.max_y.to_real ());
    }
  
    return true;
  }
  
  
  #endif
  

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