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