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

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• Hash : 47089fe7
  Author :
  Date : 2025-05-28T17:10:22
  

  Big misc changes
  
  - Make geometry types into templates taking float or double.
  - Changes to paint() transform elimination.
  - Add font->has_nonzero_coords and use it across.
  - Extensions to avar processing for otherwise invalid mappings.
  

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• src/hb-paint-extents.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_EXTENTS_HH
  #define HB_PAINT_EXTENTS_HH
  
  #include "hb.hh"
  #include "hb-paint.h"
  
  #include "hb-geometry.hh"
  
  
  typedef struct  hb_paint_extents_context_t hb_paint_extents_context_t;
  
  struct hb_paint_extents_context_t
  {
    void clear ()
    {
      transforms.clear ();
      clips.clear ();
      groups.clear ();
  
      transforms.push (hb_transform_t<>{});
      clips.push (hb_bounds_t<>{hb_bounds_t<>::UNBOUNDED});
      groups.push (hb_bounds_t<>{hb_bounds_t<>::EMPTY});
    }
  
    hb_paint_extents_context_t ()
    {
      clear ();
    }
  
    hb_extents_t<> get_extents ()
    {
      return groups.tail().extents;
    }
  
    bool is_bounded ()
    {
      return groups.tail().status != hb_bounds_t<>::UNBOUNDED;
    }
  
    void push_transform (const hb_transform_t<> &trans)
    {
      hb_transform_t<> t = transforms.tail ();
      t.multiply (trans);
      transforms.push (t);
    }
  
    void pop_transform ()
    {
      transforms.pop ();
    }
  
    void push_clip (hb_extents_t<> extents)
    {
      /* Transform extents and push a new clip. */
      const hb_transform_t<> &t = transforms.tail ();
      t.transform_extents (extents);
  
      auto bounds = hb_bounds_t<> {extents};
      bounds.intersect (clips.tail ());
  
      clips.push (bounds);
    }
  
    void pop_clip ()
    {
      clips.pop ();
    }
  
    void push_group ()
    {
      groups.push (hb_bounds_t<> {hb_bounds_t<>::EMPTY});
    }
  
    void pop_group (hb_paint_composite_mode_t mode)
    {
      const hb_bounds_t<> src_bounds = groups.pop ();
      hb_bounds_t<> &backdrop_bounds = groups.tail ();
  
      // https://learn.microsoft.com/en-us/typography/opentype/spec/colr#format-32-paintcomposite
      switch ((int) mode)
      {
        case HB_PAINT_COMPOSITE_MODE_CLEAR:
  	backdrop_bounds.status = hb_bounds_t<>::EMPTY;
  	break;
        case HB_PAINT_COMPOSITE_MODE_SRC:
        case HB_PAINT_COMPOSITE_MODE_SRC_OUT:
  	backdrop_bounds = src_bounds;
  	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_bounds.intersect (src_bounds);
  	break;
        default:
  	backdrop_bounds.union_ (src_bounds);
  	break;
       }
    }
  
    void paint ()
    {
      const hb_bounds_t<> &clip = clips.tail ();
      hb_bounds_t<> &group = groups.tail ();
  
      group.union_ (clip);
    }
  
    protected:
    hb_vector_t<hb_transform_t<>> transforms;
    hb_vector_t<hb_bounds_t<>> clips;
    hb_vector_t<hb_bounds_t<>> groups;
  };
  
  HB_INTERNAL hb_paint_funcs_t *
  hb_paint_extents_get_funcs ();
  
  
  #endif /* HB_PAINT_EXTENTS_HH */
  

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