Fixes https://github.com/harfbuzz/harfbuzz/issues/2152pull/3627/head
Behdad Esfahbod
3 years ago
parent
98aaecd397
commit
e0f3cab246
7 changed files with 218 additions and 6 deletions
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/*
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* Copyright © 2022 Behdad Esfahbod |
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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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#ifndef HB_CPLUSPLUS_HH |
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#define HB_CPLUSPLUS_HH |
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#include "hb.h" |
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HB_BEGIN_DECLS |
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HB_END_DECLS |
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#ifdef __cplusplus |
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#include <utility> |
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#if 0 |
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#if !(__cplusplus >= 201103L) |
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#error "HarfBuzz C++ helpers require C++11" |
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#endif |
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#endif |
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namespace hb { |
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template <typename T> |
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struct vtable; |
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template <typename T> |
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struct shared_ptr |
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{ |
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using v = vtable<T>; |
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explicit shared_ptr (T *p = nullptr) : p (p) {} |
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shared_ptr (const shared_ptr &o) : p (v::reference (o.p)) {} |
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shared_ptr (shared_ptr &&o) : p (o.p) { o.p = nullptr; } |
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shared_ptr& operator = (const shared_ptr &o) { if (p != o.p) { destroy (); p = o.p; reference (); } return *this; } |
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shared_ptr& operator = (shared_ptr &&o) { destroy (); p = o.p; o.p = nullptr; return *this; } |
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~shared_ptr () { v::destroy (p); } |
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T* get() const { return p; } |
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void swap (shared_ptr &o) { std::swap (p, o.p); } |
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friend void swap (shared_ptr &a, shared_ptr &b) { std::swap (a.p, b.p); } |
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operator T * () const { return p; } |
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T& operator * () const { return *get (); } |
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T* operator -> () const { return get (); } |
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operator bool () { return p; } |
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bool operator == (const shared_ptr &o) { return p == o.p; } |
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bool operator != (const shared_ptr &o) { return p != o.p; } |
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static T* get_empty() { return v::get_empty (); } |
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void reference() { v::reference (p); } |
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void destroy() { v::destroy (p); } |
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void set_user_data (hb_user_data_key_t *key, |
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void *value, |
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hb_destroy_func_t destroy, |
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hb_bool_t replace) { v::set_user_data (p, key, value, destroy, replace); }
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void * get_user_data (hb_user_data_key_t *key) { return v::get_user_data (p, key); } |
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private: |
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T *p; |
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}; |
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template <typename T, |
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T * (*_get_empty) (void), |
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T * (*_reference) (T *), |
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void (*_destroy) (T *), |
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hb_bool_t (*_set_user_data) (T *, |
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hb_user_data_key_t *, |
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void *, |
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hb_destroy_func_t, |
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hb_bool_t), |
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void * (*_get_user_data) (T *, |
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hb_user_data_key_t *)> |
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struct vtable_t |
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{ |
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static constexpr auto get_empty = _get_empty; |
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static constexpr auto reference = _reference; |
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static constexpr auto destroy = _destroy; |
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static constexpr auto set_user_data = _set_user_data; |
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static constexpr auto get_user_data = _get_user_data; |
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}; |
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#define HB_DEFINE_VTABLE(name) \ |
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template<> \
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struct vtable<hb_##name##_t> \
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: vtable_t<hb_##name##_t, \
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&hb_##name##_get_empty, \
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&hb_##name##_reference, \
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&hb_##name##_destroy, \
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&hb_##name##_set_user_data, \
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&hb_##name##_get_user_data> {} |
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HB_DEFINE_VTABLE (buffer); |
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HB_DEFINE_VTABLE (blob); |
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HB_DEFINE_VTABLE (face); |
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HB_DEFINE_VTABLE (font); |
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HB_DEFINE_VTABLE (font_funcs); |
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HB_DEFINE_VTABLE (map); |
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HB_DEFINE_VTABLE (set); |
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HB_DEFINE_VTABLE (shape_plan); |
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HB_DEFINE_VTABLE (unicode_funcs); |
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#undef HB_DEFINE_VTABLE |
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} // namespace hb
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#endif /* __cplusplus */ |
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#endif /* HB_CPLUSPLUS_HH */ |
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