kc3-lang/harfbuzz/src/hb-ot-shape.hh

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• Hash : 3b58ce45
  Author :
  Date : 2025-10-13T13:26:23
  

  [shape] Disable `kern` table in most shapers
  
  Only default, Arabic, and Hebrew keep it.
  
  Fixes https://github.com/harfbuzz/harfbuzz/issues/5607
  
  Needs documentation update.
  

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• src/hb-ot-shape.hh

• /*
   * Copyright © 2010  Google, 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.
   *
   * Google Author(s): Behdad Esfahbod
   */
  
  #ifndef HB_OT_SHAPE_HH
  #define HB_OT_SHAPE_HH
  
  #include "hb.hh"
  
  #include "hb-ot-map.hh"
  #include "hb-aat-map.hh"
  
  
  struct hb_ot_shape_plan_key_t
  {
    unsigned int variations_index[2];
  
    void init (hb_face_t *face,
  	     const int *coords,
  	     unsigned   num_coords)
    {
      for (unsigned int table_index = 0; table_index < 2; table_index++)
        hb_ot_layout_table_find_feature_variations (face,
  						  table_tags[table_index],
  						  coords,
  						  num_coords,
  						  &variations_index[table_index]);
    }
  
    bool equal (const hb_ot_shape_plan_key_t *other)
    {
      return variations_index[0] == other->variations_index[0] &&
  	   variations_index[1] == other->variations_index[1];
    }
  };
  
  
  struct hb_shape_plan_key_t;
  
  struct hb_ot_shape_plan_t
  {
    ~hb_ot_shape_plan_t () { fini (); }
  
    hb_segment_properties_t props;
    const struct hb_ot_shaper_t *shaper;
    hb_ot_map_t map;
    hb_aat_map_t aat_map;
    const void *data;
  #ifndef HB_NO_OT_SHAPE_FRACTIONS
    hb_mask_t frac_mask, numr_mask, dnom_mask;
  #else
    static constexpr hb_mask_t frac_mask = 0;
    static constexpr hb_mask_t numr_mask = 0;
    static constexpr hb_mask_t dnom_mask = 0;
  #endif
    hb_mask_t rtlm_mask;
  #ifndef HB_NO_OT_KERN
    hb_mask_t kern_mask;
  #else
    static constexpr hb_mask_t kern_mask = 0;
  #endif
  
  #ifndef HB_NO_OT_KERN
    bool requested_kerning : 1;
  #else
    static constexpr bool requested_kerning = false;
  #endif
  #ifndef HB_NO_OT_SHAPE_FRACTIONS
    bool has_frac : 1;
  #else
    static constexpr bool has_frac = false;
  #endif
    bool has_vert : 1;
    bool has_gpos_mark : 1;
    bool zero_marks : 1;
    bool fallback_glyph_classes : 1;
    bool fallback_mark_positioning : 1;
    bool adjust_mark_positioning_when_zeroing : 1;
  
    bool apply_gpos : 1;
  #ifndef HB_NO_OT_KERN
    bool apply_kern : 1;
  #else
    static constexpr bool apply_kern = false;
  #endif
    bool apply_fallback_kern : 1;
  #ifndef HB_NO_AAT_SHAPE
    bool apply_kerx : 1;
    bool apply_morx : 1;
    bool apply_trak : 1;
  #else
    static constexpr bool apply_kerx = false;
    static constexpr bool apply_morx = false;
    static constexpr bool apply_trak = false;
  #endif
  
    void collect_lookups (hb_tag_t table_tag, hb_set_t *lookups) const
    {
      unsigned int table_index;
      switch (table_tag) {
        case HB_OT_TAG_GSUB: table_index = 0; break;
        case HB_OT_TAG_GPOS: table_index = 1; break;
        default: return;
      }
      map.collect_lookups (table_index, lookups);
    }
  
    HB_INTERNAL bool init0 (hb_face_t                     *face,
  			  const hb_shape_plan_key_t     *key);
    HB_INTERNAL void fini ();
  
    HB_INTERNAL void substitute (hb_font_t *font, hb_buffer_t *buffer) const;
    HB_INTERNAL void position (hb_font_t *font, hb_buffer_t *buffer) const;
  };
  
  struct hb_shape_plan_t;
  
  struct hb_ot_shape_planner_t
  {
    /* In the order that they are filled in. */
    hb_face_t *face;
    hb_segment_properties_t props;
    hb_ot_map_builder_t map;
  #ifndef HB_NO_AAT_SHAPE
    hb_aat_map_builder_t aat_map;
    bool apply_morx : 1;
  #else
    static constexpr bool apply_morx = false;
  #endif
    bool script_zero_marks : 1;
    bool script_fallback_position : 1;
    const struct hb_ot_shaper_t *shaper;
  
    HB_INTERNAL hb_ot_shape_planner_t (hb_face_t                     *face,
  				     const hb_segment_properties_t &props);
  
    HB_INTERNAL void compile (hb_ot_shape_plan_t           &plan,
  			    const hb_ot_shape_plan_key_t &key);
  };
  
  
  #endif /* HB_OT_SHAPE_HH */
  

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