1/*
2 * Copyright © 2012 Google, Inc.
3 *
4 * This is part of HarfBuzz, a text shaping library.
5 *
6 * Permission is hereby granted, without written agreement and without
7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
11 *
12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
16 * DAMAGE.
17 *
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
23 *
24 * Google Author(s): Behdad Esfahbod
25 */
26
27#ifndef HB_SHAPER_PRIVATE_HH
28#define HB_SHAPER_PRIVATE_HH
29
30#include "hb-private.hh"
31
32typedef hb_bool_t hb_shape_func_t (hb_shape_plan_t *shape_plan,
33 hb_font_t *font,
34 hb_buffer_t *buffer,
35 const hb_feature_t *features,
36 unsigned int num_features);
37
38#define HB_SHAPER_IMPLEMENT(name) \
39 extern "C" HB_INTERNAL hb_shape_func_t _hb_##name##_shape;
40#include "hb-shaper-list.hh"
41#undef HB_SHAPER_IMPLEMENT
42
43struct hb_shaper_pair_t {
44 char name[16];
45 hb_shape_func_t *func;
46};
47
48HB_INTERNAL const hb_shaper_pair_t *
49_hb_shapers_get (void);
50
51
52/* For embedding in face / font / ... */
53struct hb_shaper_data_t {
54#define HB_SHAPER_IMPLEMENT(shaper) void *shaper;
55#include "hb-shaper-list.hh"
56#undef HB_SHAPER_IMPLEMENT
57};
58
59#define HB_SHAPERS_COUNT (sizeof (hb_shaper_data_t) / sizeof (void *))
60
61/* Means: succeeded, but don't need to keep any data. */
62#define HB_SHAPER_DATA_SUCCEEDED ((void *) +1)
63
64/* Means: tried but failed to create. */
65#define HB_SHAPER_DATA_INVALID ((void *) -1)
66#define HB_SHAPER_DATA_IS_INVALID(data) ((void *) (data) == HB_SHAPER_DATA_INVALID)
67
68#define HB_SHAPER_DATA_TYPE_NAME(shaper, object) hb_##shaper##_shaper_##object##_data_t
69#define HB_SHAPER_DATA_TYPE(shaper, object) struct HB_SHAPER_DATA_TYPE_NAME(shaper, object)
70#define HB_SHAPER_DATA_INSTANCE(shaper, object, instance) (* (HB_SHAPER_DATA_TYPE(shaper, object) **) &(instance)->shaper_data.shaper)
71#define HB_SHAPER_DATA(shaper, object) HB_SHAPER_DATA_INSTANCE(shaper, object, object)
72#define HB_SHAPER_DATA_CREATE_FUNC(shaper, object) _hb_##shaper##_shaper_##object##_data_create
73#define HB_SHAPER_DATA_DESTROY_FUNC(shaper, object) _hb_##shaper##_shaper_##object##_data_destroy
74#define HB_SHAPER_DATA_ENSURE_FUNC(shaper, object) hb_##shaper##_shaper_##object##_data_ensure
75
76#define HB_SHAPER_DATA_PROTOTYPE(shaper, object) \
77 HB_SHAPER_DATA_TYPE (shaper, object); /* Type forward declaration. */ \
78 extern "C" HB_INTERNAL HB_SHAPER_DATA_TYPE (shaper, object) * \
79 HB_SHAPER_DATA_CREATE_FUNC (shaper, object) (hb_##object##_t *object HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS); \
80 extern "C" HB_INTERNAL void \
81 HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (HB_SHAPER_DATA_TYPE (shaper, object) *data); \
82 extern "C" HB_INTERNAL bool \
83 HB_SHAPER_DATA_ENSURE_FUNC (shaper, object) (hb_##object##_t *object)
84
85#define HB_SHAPER_DATA_DESTROY(shaper, object) \
86 if (HB_SHAPER_DATA_TYPE (shaper, object) *data = HB_SHAPER_DATA (shaper, object)) \
87 if (data != HB_SHAPER_DATA_INVALID && data != HB_SHAPER_DATA_SUCCEEDED) \
88 HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (data);
89
90#define HB_SHAPER_DATA_ENSURE_DEFINE(shaper, object) \
91 HB_SHAPER_DATA_ENSURE_DEFINE_WITH_CONDITION(shaper, object, true)
92
93#define HB_SHAPER_DATA_ENSURE_DEFINE_WITH_CONDITION(shaper, object, condition) \
94bool \
95HB_SHAPER_DATA_ENSURE_FUNC(shaper, object) (hb_##object##_t *object) \
96{\
97 retry: \
98 HB_SHAPER_DATA_TYPE (shaper, object) *data = (HB_SHAPER_DATA_TYPE (shaper, object) *) hb_atomic_ptr_get (&HB_SHAPER_DATA (shaper, object)); \
99 if (likely (data) && !(condition)) { \
100 /* Drop and recreate. */ \
101 /* If someone dropped it in the mean time, throw it away and don't touch it. \
102 * Otherwise, destruct it. */ \
103 if (hb_atomic_ptr_cmpexch (&HB_SHAPER_DATA (shaper, object), data, nullptr)) { \
104 HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (data); \
105 } \
106 goto retry; \
107 } \
108 if (unlikely (!data)) { \
109 data = HB_SHAPER_DATA_CREATE_FUNC (shaper, object) (object); \
110 if (unlikely (!data)) \
111 data = (HB_SHAPER_DATA_TYPE (shaper, object) *) HB_SHAPER_DATA_INVALID; \
112 if (!hb_atomic_ptr_cmpexch (&HB_SHAPER_DATA (shaper, object), nullptr, data)) { \
113 if (data && \
114 data != HB_SHAPER_DATA_INVALID && \
115 data != HB_SHAPER_DATA_SUCCEEDED) \
116 HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (data); \
117 goto retry; \
118 } \
119 } \
120 return data != nullptr && !HB_SHAPER_DATA_IS_INVALID (data); \
121}
122
123
124#endif /* HB_SHAPER_PRIVATE_HH */
125

source code of qtbase/src/3rdparty/harfbuzz-ng/src/hb-shaper-private.hh