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

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• Hash : b4d3bf1d
  Author :
  Date : 2020-02-02T14:32:38
  

  [draw] Add hb_draw_funcs_is_immutable and hb_draw_funcs_make_immutable
  

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• src/hb-draw.cc

• /*
   * Copyright © 2019-2020  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.
   */
  
  #include "hb.hh"
  
  #ifndef HB_NO_DRAW
  
  #include "hb-draw.hh"
  #include "hb-ot.h"
  #include "hb-ot-glyf-table.hh"
  #include "hb-ot-cff1-table.hh"
  #include "hb-ot-cff2-table.hh"
  
  /**
   * hb_draw_funcs_set_move_to_func:
   * @funcs: draw functions object
   * @move_to: move-to callback
   *
   * Sets move-to callback to the draw functions object.
   *
   * Since: REPLACEME
   **/
  void
  hb_draw_funcs_set_move_to_func (hb_draw_funcs_t        *funcs,
  				hb_draw_move_to_func_t  move_to)
  {
    if (unlikely (hb_object_is_immutable (funcs))) return;
    funcs->move_to = move_to;
  }
  
  /**
   * hb_draw_funcs_set_line_to_func:
   * @funcs: draw functions object
   * @line_to: line-to callback
   *
   * Sets line-to callback to the draw functions object.
   *
   * Since: REPLACEME
   **/
  void
  hb_draw_funcs_set_line_to_func (hb_draw_funcs_t        *funcs,
  				hb_draw_line_to_func_t  line_to)
  {
    if (unlikely (hb_object_is_immutable (funcs))) return;
    funcs->line_to = line_to;
  }
  
  /**
   * hb_draw_funcs_set_quadratic_to_func:
   * @funcs: draw functions object
   * @move_to: quadratic-to callback
   *
   * Sets quadratic-to callback to the draw functions object.
   *
   * Since: REPLACEME
   **/
  void
  hb_draw_funcs_set_quadratic_to_func (hb_draw_funcs_t             *funcs,
  				     hb_draw_quadratic_to_func_t  quadratic_to)
  {
    if (unlikely (hb_object_is_immutable (funcs))) return;
    funcs->quadratic_to = quadratic_to;
  }
  
  /**
   * hb_draw_funcs_set_cubic_to_func:
   * @funcs: draw functions
   * @cubic_to: cubic-to callback
   *
   * Sets cubic-to callback to the draw functions object.
   *
   * Since: REPLACEME
   **/
  void
  hb_draw_funcs_set_cubic_to_func (hb_draw_funcs_t         *funcs,
  				 hb_draw_cubic_to_func_t  cubic_to)
  {
    if (unlikely (hb_object_is_immutable (funcs))) return;
    funcs->cubic_to = cubic_to;
  }
  
  /**
   * hb_draw_funcs_set_close_path_func:
   * @funcs: draw functions object
   * @close_path: close-path callback
   *
   * Sets close-path callback to the draw functions object.
   *
   * Since: REPLACEME
   **/
  void
  hb_draw_funcs_set_close_path_func (hb_draw_funcs_t           *funcs,
  				   hb_draw_close_path_func_t  close_path)
  {
    if (unlikely (hb_object_is_immutable (funcs))) return;
    funcs->close_path = close_path;
  }
  
  static void
  _move_to_nil (hb_position_t to_x HB_UNUSED, hb_position_t to_y HB_UNUSED, void *user_data HB_UNUSED) {}
  
  static void
  _line_to_nil (hb_position_t to_x HB_UNUSED, hb_position_t to_y HB_UNUSED, void *user_data HB_UNUSED) {}
  
  static void
  _cubic_to_nil (hb_position_t control1_x HB_UNUSED, hb_position_t control1_y HB_UNUSED,
  	       hb_position_t control2_x HB_UNUSED, hb_position_t control2_y HB_UNUSED,
  	       hb_position_t to_x HB_UNUSED, hb_position_t to_y HB_UNUSED,
  	       void *user_data HB_UNUSED) {}
  
  static void
  _close_path_nil (void *user_data HB_UNUSED) {}
  
  /**
   * hb_draw_funcs_create:
   *
   * Creates a new draw callbacks object.
   *
   * Since: REPLACEME
   **/
  hb_draw_funcs_t *
  hb_draw_funcs_create ()
  {
    hb_draw_funcs_t *funcs;
    if (unlikely (!(funcs = hb_object_create<hb_draw_funcs_t> ())))
      return const_cast<hb_draw_funcs_t *> (&Null (hb_draw_funcs_t));
  
    funcs->move_to = (hb_draw_move_to_func_t) _move_to_nil;
    funcs->line_to = (hb_draw_line_to_func_t) _line_to_nil;
    funcs->quadratic_to = nullptr;
    funcs->cubic_to = (hb_draw_cubic_to_func_t) _cubic_to_nil;
    funcs->close_path = (hb_draw_close_path_func_t) _close_path_nil;
    return funcs;
  }
  
  /**
   * hb_draw_funcs_reference:
   * @funcs: draw functions
   *
   * Add to callbacks object refcount.
   *
   * Returns: The same object.
   * Since: REPLACEME
   **/
  hb_draw_funcs_t *
  hb_draw_funcs_reference (hb_draw_funcs_t *funcs)
  {
    return hb_object_reference (funcs);
  }
  
  /**
   * hb_draw_funcs_destroy:
   * @funcs: draw functions
   *
   * Decreases refcount of callbacks object and deletes the object if it reaches
   * to zero.
   *
   * Since: REPLACEME
   **/
  void
  hb_draw_funcs_destroy (hb_draw_funcs_t *funcs)
  {
    if (!hb_object_destroy (funcs)) return;
  
    free (funcs);
  }
  
  /**
   * hb_draw_funcs_make_immutable:
   * @funcs: draw functions
   *
   * Makes funcs object immutable.
   *
   * Since: REPLACEME
   **/
  void
  hb_draw_funcs_make_immutable (hb_draw_funcs_t *funcs)
  {
    if (hb_object_is_immutable (funcs))
      return;
  
    hb_object_make_immutable (funcs);
  }
  
  /**
   * hb_draw_funcs_is_immutable:
   * @funcs: draw functions
   *
   * Checks whether funcs is immutable.
   *
   * Returns: If is immutable.
   * Since: REPLACEME
   **/
  hb_bool_t
  hb_draw_funcs_is_immutable (hb_draw_funcs_t *funcs)
  {
    return hb_object_is_immutable (funcs);
  }
  
  /**
   * hb_font_draw_glyph:
   * @font: a font object
   * @glyph: a glyph id
   * @funcs: draw callbacks object
   * @user_data: parameter you like be passed to the callbacks when are called
   *
   * Draw a glyph.
   *
   * Returns: Whether the font had the glyph and the operation completed successfully.
   * Since: REPLACEME
   **/
  hb_bool_t
  hb_font_draw_glyph (hb_font_t *font, hb_codepoint_t glyph,
  		    const hb_draw_funcs_t *funcs,
  		    void *user_data)
  {
    if (unlikely (funcs == &Null (hb_draw_funcs_t) ||
  		glyph >= font->face->get_num_glyphs ()))
      return false;
  
    if (font->face->table.glyf->get_path (font, glyph, funcs, user_data)) return true;
  #ifndef HB_NO_CFF
    if (font->face->table.cff1->get_path (font, glyph, funcs, user_data)) return true;
    if (font->face->table.cff2->get_path (font, glyph, funcs, user_data)) return true;
  #endif
  
    return false;
  }
  
  #endif
  

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