1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
|
/*
* Copyright © 2022 Behdad Esfahbod
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
#ifndef HB_CPLUSPLUS_HH
#define HB_CPLUSPLUS_HH
#include "hb.h"
HB_BEGIN_DECLS
HB_END_DECLS
#ifdef __cplusplus
#include <functional>
#include <utility>
#if 0
#if !(__cplusplus >= 201103L)
#error "HarfBuzz C++ helpers require C++11"
#endif
#endif
namespace hb {
template <typename T>
struct vtable;
template <typename T>
struct shared_ptr
{
using element_type = T;
using v = vtable<T>;
explicit shared_ptr (T *p = nullptr) : p (p) {}
shared_ptr (const shared_ptr &o) : p (v::reference (o.p)) {}
shared_ptr (shared_ptr &&o) : p (o.p) { o.p = nullptr; }
shared_ptr& operator = (const shared_ptr &o) { if (p != o.p) { destroy (); p = o.p; reference (); } return *this; }
shared_ptr& operator = (shared_ptr &&o) { v::destroy (p); p = o.p; o.p = nullptr; return *this; }
~shared_ptr () { v::destroy (p); p = nullptr; }
T* get() const { return p; }
void swap (shared_ptr &o) { std::swap (p, o.p); }
friend void swap (shared_ptr &a, shared_ptr &b) { std::swap (a.p, b.p); }
operator T * () const { return p; }
T& operator * () const { return *get (); }
T* operator -> () const { return get (); }
operator bool () { return p; }
bool operator == (const shared_ptr &o) { return p == o.p; }
bool operator != (const shared_ptr &o) { return p != o.p; }
static T* get_empty() { return v::get_empty (); }
T* reference() { return v::reference (p); }
void destroy() { v::destroy (p); }
void set_user_data (hb_user_data_key_t *key,
void *value,
hb_destroy_func_t destroy,
hb_bool_t replace) { v::set_user_data (p, key, value, destroy, replace); }
void * get_user_data (hb_user_data_key_t *key) { return v::get_user_data (p, key); }
private:
T *p;
};
template<typename T> struct is_shared_ptr : std::false_type {};
template<typename T> struct is_shared_ptr<shared_ptr<T>> : std::true_type {};
template <typename T>
struct unique_ptr
{
using element_type = T;
using v = vtable<T>;
explicit unique_ptr (T *p = nullptr) : p (p) {}
unique_ptr (const unique_ptr &o) = delete;
unique_ptr (unique_ptr &&o) : p (o.p) { o.p = nullptr; }
unique_ptr& operator = (const unique_ptr &o) = delete;
unique_ptr& operator = (unique_ptr &&o) { v::destroy (p); p = o.p; o.p = nullptr; return *this; }
~unique_ptr () { v::destroy (p); p = nullptr; }
T* get() const { return p; }
T* release () { T* v = p; p = nullptr; return v; }
void swap (unique_ptr &o) { std::swap (p, o.p); }
friend void swap (unique_ptr &a, unique_ptr &b) { std::swap (a.p, b.p); }
operator T * () const { return p; }
T& operator * () const { return *get (); }
T* operator -> () const { return get (); }
operator bool () { return p; }
private:
T *p;
};
template<typename T> struct is_unique_ptr : std::false_type {};
template<typename T> struct is_unique_ptr<unique_ptr<T>> : std::true_type {};
template <typename T,
T * (*_get_empty) (void),
T * (*_reference) (T *),
void (*_destroy) (T *),
hb_bool_t (*_set_user_data) (T *,
hb_user_data_key_t *,
void *,
hb_destroy_func_t,
hb_bool_t),
void * (*_get_user_data) (const T *,
hb_user_data_key_t *)>
struct vtable_t
{
static constexpr auto get_empty = _get_empty;
static constexpr auto reference = _reference;
static constexpr auto destroy = _destroy;
static constexpr auto set_user_data = _set_user_data;
static constexpr auto get_user_data = _get_user_data;
};
#define HB_DEFINE_VTABLE(name) \
template<> \
struct vtable<hb_##name##_t> \
: vtable_t<hb_##name##_t, \
&hb_##name##_get_empty, \
&hb_##name##_reference, \
&hb_##name##_destroy, \
&hb_##name##_set_user_data, \
&hb_##name##_get_user_data> {}
HB_DEFINE_VTABLE (buffer);
HB_DEFINE_VTABLE (blob);
HB_DEFINE_VTABLE (face);
HB_DEFINE_VTABLE (font);
HB_DEFINE_VTABLE (font_funcs);
HB_DEFINE_VTABLE (map);
HB_DEFINE_VTABLE (set);
HB_DEFINE_VTABLE (shape_plan);
HB_DEFINE_VTABLE (unicode_funcs);
#undef HB_DEFINE_VTABLE
#ifdef HB_SUBSET_H
#define HB_DEFINE_VTABLE(name) \
template<> \
struct vtable<hb_##name##_t> \
: vtable_t<hb_##name##_t, \
nullptr, \
&hb_##name##_reference, \
&hb_##name##_destroy, \
&hb_##name##_set_user_data, \
&hb_##name##_get_user_data> {}
HB_DEFINE_VTABLE (subset_input);
HB_DEFINE_VTABLE (subset_plan);
#undef HB_DEFINE_VTABLE
#endif
} // namespace hb
/* Workaround for GCC < 7, see:
* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56480
* https://stackoverflow.com/a/25594741 */
namespace std {
template<typename T>
struct hash<hb::shared_ptr<T>>
{
std::size_t operator()(const hb::shared_ptr<T>& v) const noexcept
{
std::size_t h = std::hash<decltype (v.get ())>{}(v.get ());
return h;
}
};
template<typename T>
struct hash<hb::unique_ptr<T>>
{
std::size_t operator()(const hb::unique_ptr<T>& v) const noexcept
{
std::size_t h = std::hash<decltype (v.get ())>{}(v.get ());
return h;
}
};
} // namespace std
#endif /* __cplusplus */
#endif /* HB_CPLUSPLUS_HH */
|