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

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  Date : 2020-04-21T22:19:46
  

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• src/hb-shaper.hh

• /*
   * Copyright © 2012  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_SHAPER_HH
  #define HB_SHAPER_HH
  
  #include "hb.hh"
  #include "hb-machinery.hh"
  
  typedef hb_bool_t hb_shape_func_t (hb_shape_plan_t    *shape_plan,
  				   hb_font_t          *font,
  				   hb_buffer_t        *buffer,
  				   const hb_feature_t *features,
  				   unsigned int        num_features);
  
  #define HB_SHAPER_IMPLEMENT(name) \
  	extern "C" HB_INTERNAL hb_shape_func_t _hb_##name##_shape;
  #include "hb-shaper-list.hh"
  #undef HB_SHAPER_IMPLEMENT
  
  struct hb_shaper_entry_t {
    char name[16];
    hb_shape_func_t *func;
  };
  
  HB_INTERNAL const hb_shaper_entry_t *
  _hb_shapers_get ();
  
  
  template <typename Data, unsigned int WheresData, typename T>
  struct hb_shaper_lazy_loader_t;
  
  #define HB_SHAPER_ORDER(Shaper) \
    HB_PASTE (HB_SHAPER_ORDER_, Shaper)
  enum hb_shaper_order_t
  {
    _HB_SHAPER_ORDER_ORDER_ZERO,
  #define HB_SHAPER_IMPLEMENT(Shaper) \
        HB_SHAPER_ORDER (Shaper),
  #include "hb-shaper-list.hh"
  #undef HB_SHAPER_IMPLEMENT
    _HB_SHAPERS_COUNT_PLUS_ONE,
    HB_SHAPERS_COUNT = _HB_SHAPERS_COUNT_PLUS_ONE - 1,
  };
  
  template <enum hb_shaper_order_t order, typename Object> struct hb_shaper_object_data_type_t;
  
  #define HB_SHAPER_DATA_SUCCEEDED ((void *) +1)
  #define HB_SHAPER_DATA_TYPE(shaper, object)		hb_##shaper##_##object##_data_t
  #define HB_SHAPER_DATA_CREATE_FUNC(shaper, object)	_hb_##shaper##_shaper_##object##_data_create
  #define HB_SHAPER_DATA_DESTROY_FUNC(shaper, object)	_hb_##shaper##_shaper_##object##_data_destroy
  
  #define HB_SHAPER_DATA_INSTANTIATE_SHAPERS(shaper, object) \
  	\
  	struct HB_SHAPER_DATA_TYPE (shaper, object); /* Type forward declaration. */ \
  	extern "C" HB_INTERNAL HB_SHAPER_DATA_TYPE (shaper, object) * \
  	HB_SHAPER_DATA_CREATE_FUNC (shaper, object) (hb_##object##_t *object); \
  	extern "C" HB_INTERNAL void \
  	HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (HB_SHAPER_DATA_TYPE (shaper, object) *shaper##_##object); \
  	\
  	template <> \
  	struct hb_shaper_object_data_type_t<HB_SHAPER_ORDER (shaper), hb_##object##_t> \
  	{ \
  	  typedef HB_SHAPER_DATA_TYPE(shaper, object) value; \
  	}; \
  	\
  	template <unsigned int WheresData> \
  	struct hb_shaper_lazy_loader_t<hb_##object##_t, WheresData, HB_SHAPER_DATA_TYPE(shaper, object)> \
  		: hb_lazy_loader_t<HB_SHAPER_DATA_TYPE(shaper, object), \
  				   hb_shaper_lazy_loader_t<hb_##object##_t, \
  							   WheresData, \
  							   HB_SHAPER_DATA_TYPE(shaper, object)>, \
  				   hb_##object##_t, WheresData> \
  	{ \
  	  typedef HB_SHAPER_DATA_TYPE(shaper, object) Type; \
  	  static Type* create (hb_##object##_t *data) \
  	  { return HB_SHAPER_DATA_CREATE_FUNC (shaper, object) (data); } \
  	  static Type *get_null () { return nullptr; } \
  	  static void destroy (Type *p) { HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (p); } \
  	}; \
  	\
  	static_assert (true, "") /* Require semicolon after. */
  
  
  template <typename Object>
  struct hb_shaper_object_dataset_t
  {
    void init0 (Object *parent_data)
    {
      this->parent_data = parent_data;
  #define HB_SHAPER_IMPLEMENT(shaper) shaper.init0 ();
  #include "hb-shaper-list.hh"
  #undef HB_SHAPER_IMPLEMENT
    }
    void fini ()
    {
  #define HB_SHAPER_IMPLEMENT(shaper) shaper.fini ();
  #include "hb-shaper-list.hh"
  #undef HB_SHAPER_IMPLEMENT
    }
  
    Object *parent_data; /* MUST be JUST before the lazy loaders. */
  #define HB_SHAPER_IMPLEMENT(shaper) \
  	hb_shaper_lazy_loader_t<Object, HB_SHAPER_ORDER(shaper), \
  				typename hb_shaper_object_data_type_t<HB_SHAPER_ORDER(shaper), Object>::value \
  			       > shaper;
  #include "hb-shaper-list.hh"
  #undef HB_SHAPER_IMPLEMENT
  };
  
  #endif /* HB_SHAPER_HH */
  

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