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

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• Author : Ebrahim Byagowi
  Date : 2020-04-20 14:12:45
  Hash : 2dda6dd7
  Message : minor, tweak spacing turn 8 spaces to tab, add space before Null/Crap

• src/hb-draw.hh

• /*
   * Copyright © 2020  Ebrahim Byagowi
   *
   *  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.
   */
  
  #ifndef HB_DRAW_HH
  #define HB_DRAW_HH
  
  #include "hb.hh"
  
  #ifdef HB_EXPERIMENTAL_API
  struct hb_draw_funcs_t
  {
    hb_object_header_t header;
  
    hb_draw_move_to_func_t move_to;
    hb_draw_line_to_func_t line_to;
    hb_draw_quadratic_to_func_t quadratic_to;
    bool is_quadratic_to_set;
    hb_draw_cubic_to_func_t cubic_to;
    hb_draw_close_path_func_t close_path;
  };
  
  struct draw_helper_t
  {
    draw_helper_t (const hb_draw_funcs_t *funcs_, void *user_data_)
    {
      funcs = funcs_;
      user_data = user_data_;
      path_open = false;
      path_start_x = current_x = path_start_y = current_y = 0;
    }
    ~draw_helper_t () { end_path (); }
  
    void move_to (hb_position_t x, hb_position_t y)
    {
      if (path_open) end_path ();
      current_x = path_start_x = x;
      current_y = path_start_y = y;
    }
  
    void line_to (hb_position_t x, hb_position_t y)
    {
      if (equal_to_current (x, y)) return;
      if (!path_open) start_path ();
      funcs->line_to (x, y, user_data);
      current_x = x;
      current_y = y;
    }
  
    void
    quadratic_to (hb_position_t control_x, hb_position_t control_y,
  		hb_position_t to_x, hb_position_t to_y)
    {
      if (equal_to_current (control_x, control_y) && equal_to_current (to_x, to_y))
        return;
      if (!path_open) start_path ();
      if (funcs->is_quadratic_to_set)
        funcs->quadratic_to (control_x, control_y, to_x, to_y, user_data);
      else
        funcs->cubic_to (roundf ((current_x + 2.f * control_x) / 3.f),
  		       roundf ((current_y + 2.f * control_y) / 3.f),
  		       roundf ((to_x + 2.f * control_x) / 3.f),
  		       roundf ((to_y + 2.f * control_y) / 3.f),
  		       to_x, to_y, user_data);
      current_x = to_x;
      current_y = to_y;
    }
  
    void
    cubic_to (hb_position_t control1_x, hb_position_t control1_y,
  	    hb_position_t control2_x, hb_position_t control2_y,
  	    hb_position_t to_x, hb_position_t to_y)
    {
      if (equal_to_current (control1_x, control1_y) &&
  	equal_to_current (control2_x, control2_y) &&
  	equal_to_current (to_x, to_y))
        return;
      if (!path_open) start_path ();
      funcs->cubic_to (control1_x, control1_y, control2_x, control2_y, to_x, to_y, user_data);
      current_x = to_x;
      current_y = to_y;
    }
  
    void end_path ()
    {
      if (path_open)
      {
        if ((path_start_x != current_x) || (path_start_y != current_y))
  	funcs->line_to (path_start_x, path_start_y, user_data);
        funcs->close_path (user_data);
      }
      path_open = false;
      path_start_x = current_x = path_start_y = current_y = 0;
    }
  
    protected:
    bool equal_to_current (hb_position_t x, hb_position_t y)
    { return current_x == x && current_y == y; }
  
    void start_path ()
    {
      if (path_open) end_path ();
      path_open = true;
      funcs->move_to (path_start_x, path_start_y, user_data);
    }
  
    hb_position_t path_start_x;
    hb_position_t path_start_y;
  
    hb_position_t current_x;
    hb_position_t current_y;
  
    bool path_open;
    const hb_draw_funcs_t *funcs;
    void *user_data;
  };
  #endif
  
  #endif /* HB_DRAW_HH */