223 lines
6.1 KiB
C++
223 lines
6.1 KiB
C++
/*
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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 <functional>
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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 element_type = T;
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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) { v::destroy (p); p = o.p; o.p = nullptr; return *this; }
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~shared_ptr () { v::destroy (p); p = nullptr; }
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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 () const { return p; }
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bool operator == (const shared_ptr &o) const { return p == o.p; }
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bool operator != (const shared_ptr &o) const { return p != o.p; }
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static T* get_empty() { return v::get_empty (); }
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T* reference() { return 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> struct is_shared_ptr : std::false_type {};
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template<typename T> struct is_shared_ptr<shared_ptr<T>> : std::true_type {};
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template <typename T>
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struct unique_ptr
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{
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using element_type = T;
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using v = vtable<T>;
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explicit unique_ptr (T *p = nullptr) : p (p) {}
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unique_ptr (const unique_ptr &o) = delete;
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unique_ptr (unique_ptr &&o) : p (o.p) { o.p = nullptr; }
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unique_ptr& operator = (const unique_ptr &o) = delete;
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unique_ptr& operator = (unique_ptr &&o) { v::destroy (p); p = o.p; o.p = nullptr; return *this; }
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~unique_ptr () { v::destroy (p); p = nullptr; }
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T* get() const { return p; }
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T* release () { T* v = p; p = nullptr; return v; }
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void swap (unique_ptr &o) { std::swap (p, o.p); }
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friend void swap (unique_ptr &a, unique_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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private:
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T *p;
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};
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template<typename T> struct is_unique_ptr : std::false_type {};
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template<typename T> struct is_unique_ptr<unique_ptr<T>> : std::true_type {};
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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) (const 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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HB_DEFINE_VTABLE (draw_funcs);
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HB_DEFINE_VTABLE (paint_funcs);
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#undef HB_DEFINE_VTABLE
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#ifdef HB_SUBSET_H
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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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nullptr, \
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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 (subset_input);
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HB_DEFINE_VTABLE (subset_plan);
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#undef HB_DEFINE_VTABLE
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#endif
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} // namespace hb
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/* Workaround for GCC < 7, see:
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* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56480
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* https://stackoverflow.com/a/25594741 */
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namespace std {
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template<typename T>
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struct hash<hb::shared_ptr<T>>
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{
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std::size_t operator()(const hb::shared_ptr<T>& v) const noexcept
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{
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std::size_t h = std::hash<decltype (v.get ())>{}(v.get ());
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return h;
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}
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};
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template<typename T>
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struct hash<hb::unique_ptr<T>>
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{
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std::size_t operator()(const hb::unique_ptr<T>& v) const noexcept
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{
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std::size_t h = std::hash<decltype (v.get ())>{}(v.get ());
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return h;
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}
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};
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} // namespace std
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#endif /* __cplusplus */
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#endif /* HB_CPLUSPLUS_HH */
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