135 lines
5.7 KiB
C++
135 lines
5.7 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_HH
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#define HB_SHAPER_HH
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#include "hb.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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/* 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_TYPE_NAME(shaper, object) hb_##shaper##_##object##_data_t
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#define HB_SHAPER_DATA_TYPE(shaper, object) struct HB_SHAPER_DATA_TYPE_NAME(shaper, object)
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#define HB_SHAPER_DATA_INSTANCE(shaper, object, instance) (* reinterpret_cast<hb_atomic_ptr_t<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_ENSURE_FUNC(shaper, object) hb_##shaper##_shaper_##object##_data_ensure
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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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extern "C" HB_INTERNAL bool \
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HB_SHAPER_DATA_ENSURE_FUNC (shaper, object) (hb_##object##_t *object)
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#define HB_SHAPER_DATA_DESTROY(shaper, object) \
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if (HB_SHAPER_DATA_TYPE (shaper, object) *data = HB_SHAPER_DATA (shaper, object).get ()) \
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if (data != HB_SHAPER_DATA_INVALID && data != HB_SHAPER_DATA_SUCCEEDED) \
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HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (data);
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#define HB_SHAPER_DATA_ENSURE_DEFINE(shaper, object) \
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HB_SHAPER_DATA_ENSURE_DEFINE_WITH_CONDITION(shaper, object, true)
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#define HB_SHAPER_DATA_ENSURE_DEFINE_WITH_CONDITION(shaper, object, condition) \
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bool \
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HB_SHAPER_DATA_ENSURE_FUNC(shaper, object) (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 (shaper, object).get (); \
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if (likely (data) && !(condition)) { \
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/* XXX-MT-bug \
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* Note that evaluating condition above can be dangerous if another thread \
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* got here first and destructed data. That's, as always, bad use pattern. \
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* If you modify the font (change font size), other threads must not be \
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* using it at the same time. However, since this check is delayed to \
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* when one actually tries to shape something, this is a XXX race condition \
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* (and the only know we have that I know of) right now. Ie. you modify the \
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* font size in one thread, then (supposedly safely) try to use it from two \
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* or more threads and BOOM! I'm not sure how to fix this. We want RCU. \
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* Maybe when it doesn't matter when we finally implement AAT shaping, as
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* this (condition) is currently only used by hb-coretext. */ \
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/* Drop and recreate. */ \
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/* If someone dropped it in the mean time, throw it away and don't touch it. \
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* Otherwise, destruct it. */ \
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if (likely (HB_SHAPER_DATA (shaper, object).cmpexch (data, nullptr))) \
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{ \
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HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (data); \
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} \
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goto retry; \
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} \
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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 (unlikely (!HB_SHAPER_DATA (shaper, object).cmpexch (nullptr, 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 != nullptr && (void *) data != HB_SHAPER_DATA_INVALID; \
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}
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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) hb_atomic_ptr_t<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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#endif /* HB_SHAPER_HH */
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