kc3-lang/harfbuzz/src/hb-paint-bounded.hh

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• Hash : c62af2c3
  Author :
  Date : 2025-04-20T04:53:33
  

  [paint-unbounded] Minor tweak
  
  I like it better this way.
  

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• src/hb-paint-bounded.hh

• /*
   * Copyright © 2022 Behdad Esfahbod
   *
   *  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_PAINT_BOUNDED_HH
  #define HB_PAINT_BOUNDED_HH
  
  #include "hb.hh"
  #include "hb-paint.h"
  
  #include "hb-geometry.hh"
  
  
  typedef struct  hb_paint_bounded_context_t hb_paint_bounded_context_t;
  
  struct hb_paint_bounded_context_t
  {
    void clear ()
    {
      clips = 0;
      bounded = true;
      groups.clear ();
    }
  
    hb_paint_bounded_context_t ()
    {
      clear ();
    }
  
    bool is_bounded ()
    {
      return bounded;
    }
  
    void push_clip ()
    {
      clips++;
    }
  
    void pop_clip ()
    {
      if (clips == 0) return;
      clips--;
    }
  
    void push_group ()
    {
      groups.push (bounded);
      bounded = true;
    }
  
    void pop_group (hb_paint_composite_mode_t mode)
    {
      const bool src_bounded = bounded;
      bounded = groups.pop ();
      bool &backdrop_bounded = bounded;
  
      // https://learn.microsoft.com/en-us/typography/opentype/spec/colr#format-32-paintcomposite
      switch ((int) mode)
      {
        case HB_PAINT_COMPOSITE_MODE_CLEAR:
  	backdrop_bounded = true;
  	break;
        case HB_PAINT_COMPOSITE_MODE_SRC:
        case HB_PAINT_COMPOSITE_MODE_SRC_OUT:
  	backdrop_bounded = src_bounded;
  	break;
        case HB_PAINT_COMPOSITE_MODE_DEST:
        case HB_PAINT_COMPOSITE_MODE_DEST_OUT:
  	break;
        case HB_PAINT_COMPOSITE_MODE_SRC_IN:
        case HB_PAINT_COMPOSITE_MODE_DEST_IN:
  	backdrop_bounded = backdrop_bounded && src_bounded;
  	break;
        default:
  	backdrop_bounded = backdrop_bounded || src_bounded;
  	break;
       }
    }
  
    void paint ()
    {
      if (!clips)
        bounded = false;
    }
  
    protected:
    bool bounded; // true if current drawing bounded
    unsigned clips; // number of active clips
    hb_vector_t<bool> groups; // true if group bounded
  };
  
  HB_INTERNAL hb_paint_funcs_t *
  hb_paint_bounded_get_funcs ();
  
  
  #endif /* HB_PAINT_BOUNDED_HH */
  

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