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 | |
32 | typedef 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 | |
43 | struct hb_shaper_pair_t { |
44 | char name[16]; |
45 | hb_shape_func_t *func; |
46 | }; |
47 | |
48 | HB_INTERNAL const hb_shaper_pair_t * |
49 | _hb_shapers_get (void); |
50 | |
51 | |
52 | /* For embedding in face / font / ... */ |
53 | struct 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) \ |
94 | bool \ |
95 | HB_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 | |