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