michael@0: /*
michael@0:  * Copyright © 2012  Google, Inc.
michael@0:  *
michael@0:  *  This is part of HarfBuzz, a text shaping library.
michael@0:  *
michael@0:  * Permission is hereby granted, without written agreement and without
michael@0:  * license or royalty fees, to use, copy, modify, and distribute this
michael@0:  * software and its documentation for any purpose, provided that the
michael@0:  * above copyright notice and the following two paragraphs appear in
michael@0:  * all copies of this software.
michael@0:  *
michael@0:  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
michael@0:  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
michael@0:  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
michael@0:  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
michael@0:  * DAMAGE.
michael@0:  *
michael@0:  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
michael@0:  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
michael@0:  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
michael@0:  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
michael@0:  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
michael@0:  *
michael@0:  * Google Author(s): Behdad Esfahbod
michael@0:  */
michael@0: 
michael@0: #ifndef HB_SHAPER_PRIVATE_HH
michael@0: #define HB_SHAPER_PRIVATE_HH
michael@0: 
michael@0: #include "hb-private.hh"
michael@0: 
michael@0: typedef hb_bool_t hb_shape_func_t (hb_shape_plan_t    *shape_plan,
michael@0: 				   hb_font_t          *font,
michael@0: 				   hb_buffer_t        *buffer,
michael@0: 				   const hb_feature_t *features,
michael@0: 				   unsigned int        num_features);
michael@0: 
michael@0: #define HB_SHAPER_IMPLEMENT(name) \
michael@0: 	extern "C" HB_INTERNAL hb_shape_func_t _hb_##name##_shape;
michael@0: #include "hb-shaper-list.hh"
michael@0: #undef HB_SHAPER_IMPLEMENT
michael@0: 
michael@0: struct hb_shaper_pair_t {
michael@0:   char name[16];
michael@0:   hb_shape_func_t *func;
michael@0: };
michael@0: 
michael@0: HB_INTERNAL const hb_shaper_pair_t *
michael@0: _hb_shapers_get (void);
michael@0: 
michael@0: 
michael@0: /* For embedding in face / font / ... */
michael@0: struct hb_shaper_data_t {
michael@0: #define HB_SHAPER_IMPLEMENT(shaper) void *shaper;
michael@0: #include "hb-shaper-list.hh"
michael@0: #undef HB_SHAPER_IMPLEMENT
michael@0: };
michael@0: 
michael@0: #define HB_SHAPERS_COUNT (sizeof (hb_shaper_data_t) / sizeof (void *))
michael@0: 
michael@0: /* Means: succeeded, but don't need to keep any data. */
michael@0: #define HB_SHAPER_DATA_SUCCEEDED ((void *) +1)
michael@0: 
michael@0: /* Means: tried but failed to create. */
michael@0: #define HB_SHAPER_DATA_INVALID ((void *) -1)
michael@0: #define HB_SHAPER_DATA_IS_INVALID(data) ((void *) (data) == HB_SHAPER_DATA_INVALID)
michael@0: 
michael@0: #define HB_SHAPER_DATA_TYPE(shaper, object)		struct hb_##shaper##_shaper_##object##_data_t
michael@0: #define HB_SHAPER_DATA_INSTANCE(shaper, object, instance)	(* (HB_SHAPER_DATA_TYPE(shaper, object) **) &(instance)->shaper_data.shaper)
michael@0: #define HB_SHAPER_DATA(shaper, object)			HB_SHAPER_DATA_INSTANCE (shaper, object, object)
michael@0: #define HB_SHAPER_DATA_CREATE_FUNC(shaper, object)	_hb_##shaper##_shaper_##object##_data_create
michael@0: #define HB_SHAPER_DATA_DESTROY_FUNC(shaper, object)	_hb_##shaper##_shaper_##object##_data_destroy
michael@0: 
michael@0: #define HB_SHAPER_DATA_PROTOTYPE(shaper, object) \
michael@0: 	HB_SHAPER_DATA_TYPE (shaper, object); /* Type forward declaration. */ \
michael@0: 	extern "C" HB_INTERNAL HB_SHAPER_DATA_TYPE (shaper, object) * \
michael@0: 	HB_SHAPER_DATA_CREATE_FUNC (shaper, object) (hb_##object##_t *object HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS); \
michael@0: 	extern "C" HB_INTERNAL void \
michael@0: 	HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (HB_SHAPER_DATA_TYPE (shaper, object) *data)
michael@0: 
michael@0: #define HB_SHAPER_DATA_DESTROY(shaper, object) \
michael@0: 	if (object->shaper_data.shaper && \
michael@0: 	    object->shaper_data.shaper != HB_SHAPER_DATA_INVALID && \
michael@0: 	    object->shaper_data.shaper != HB_SHAPER_DATA_SUCCEEDED) \
michael@0: 	  HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (HB_SHAPER_DATA (shaper, object));
michael@0: 
michael@0: #define HB_SHAPER_DATA_ENSURE_DECLARE(shaper, object) \
michael@0: static inline bool \
michael@0: hb_##shaper##_shaper_##object##_data_ensure (hb_##object##_t *object) \
michael@0: {\
michael@0:   retry: \
michael@0:   HB_SHAPER_DATA_TYPE (shaper, object) *data = (HB_SHAPER_DATA_TYPE (shaper, object) *) hb_atomic_ptr_get (&HB_SHAPER_DATA (shaper, object)); \
michael@0:   if (unlikely (!data)) { \
michael@0:     data = HB_SHAPER_DATA_CREATE_FUNC (shaper, object) (object); \
michael@0:     if (unlikely (!data)) \
michael@0:       data = (HB_SHAPER_DATA_TYPE (shaper, object) *) HB_SHAPER_DATA_INVALID; \
michael@0:     if (!hb_atomic_ptr_cmpexch (&HB_SHAPER_DATA (shaper, object), NULL, data)) { \
michael@0:       if (data && \
michael@0: 	  data != HB_SHAPER_DATA_INVALID && \
michael@0: 	  data != HB_SHAPER_DATA_SUCCEEDED) \
michael@0: 	HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (data); \
michael@0:       goto retry; \
michael@0:     } \
michael@0:   } \
michael@0:   return data != NULL && !HB_SHAPER_DATA_IS_INVALID (data); \
michael@0: }
michael@0: 
michael@0: 
michael@0: #endif /* HB_SHAPER_PRIVATE_HH */