1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/harfbuzz/src/hb-object-private.hh Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,227 @@
1.4 +/*
1.5 + * Copyright © 2007 Chris Wilson
1.6 + * Copyright © 2009,2010 Red Hat, Inc.
1.7 + * Copyright © 2011,2012 Google, Inc.
1.8 + *
1.9 + * This is part of HarfBuzz, a text shaping library.
1.10 + *
1.11 + * Permission is hereby granted, without written agreement and without
1.12 + * license or royalty fees, to use, copy, modify, and distribute this
1.13 + * software and its documentation for any purpose, provided that the
1.14 + * above copyright notice and the following two paragraphs appear in
1.15 + * all copies of this software.
1.16 + *
1.17 + * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
1.18 + * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
1.19 + * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
1.20 + * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
1.21 + * DAMAGE.
1.22 + *
1.23 + * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
1.24 + * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
1.25 + * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
1.26 + * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
1.27 + * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
1.28 + *
1.29 + * Contributor(s):
1.30 + * Chris Wilson <chris@chris-wilson.co.uk>
1.31 + * Red Hat Author(s): Behdad Esfahbod
1.32 + * Google Author(s): Behdad Esfahbod
1.33 + */
1.34 +
1.35 +#ifndef HB_OBJECT_PRIVATE_HH
1.36 +#define HB_OBJECT_PRIVATE_HH
1.37 +
1.38 +#include "hb-private.hh"
1.39 +
1.40 +#include "hb-atomic-private.hh"
1.41 +#include "hb-mutex-private.hh"
1.42 +
1.43 +
1.44 +/* Debug */
1.45 +
1.46 +#ifndef HB_DEBUG_OBJECT
1.47 +#define HB_DEBUG_OBJECT (HB_DEBUG+0)
1.48 +#endif
1.49 +
1.50 +
1.51 +/* reference_count */
1.52 +
1.53 +#define HB_REFERENCE_COUNT_INVALID_VALUE ((hb_atomic_int_t) -1)
1.54 +#define HB_REFERENCE_COUNT_INVALID {HB_REFERENCE_COUNT_INVALID_VALUE}
1.55 +struct hb_reference_count_t
1.56 +{
1.57 + hb_atomic_int_t ref_count;
1.58 +
1.59 + inline void init (int v) { ref_count = v; }
1.60 + inline int inc (void) { return hb_atomic_int_add (const_cast<hb_atomic_int_t &> (ref_count), 1); }
1.61 + inline int dec (void) { return hb_atomic_int_add (const_cast<hb_atomic_int_t &> (ref_count), -1); }
1.62 + inline void finish (void) { ref_count = HB_REFERENCE_COUNT_INVALID_VALUE; }
1.63 +
1.64 + inline bool is_invalid (void) const { return ref_count == HB_REFERENCE_COUNT_INVALID_VALUE; }
1.65 +
1.66 +};
1.67 +
1.68 +
1.69 +/* user_data */
1.70 +
1.71 +#define HB_USER_DATA_ARRAY_INIT {HB_MUTEX_INIT, HB_LOCKABLE_SET_INIT}
1.72 +struct hb_user_data_array_t
1.73 +{
1.74 + /* TODO Add tracing. */
1.75 +
1.76 + struct hb_user_data_item_t {
1.77 + hb_user_data_key_t *key;
1.78 + void *data;
1.79 + hb_destroy_func_t destroy;
1.80 +
1.81 + inline bool operator == (hb_user_data_key_t *other_key) const { return key == other_key; }
1.82 + inline bool operator == (hb_user_data_item_t &other) const { return key == other.key; }
1.83 +
1.84 + void finish (void) { if (destroy) destroy (data); }
1.85 + };
1.86 +
1.87 + hb_mutex_t lock;
1.88 + hb_lockable_set_t<hb_user_data_item_t, hb_mutex_t> items;
1.89 +
1.90 + inline void init (void) { lock.init (); items.init (); }
1.91 +
1.92 + HB_INTERNAL bool set (hb_user_data_key_t *key,
1.93 + void * data,
1.94 + hb_destroy_func_t destroy,
1.95 + hb_bool_t replace);
1.96 +
1.97 + HB_INTERNAL void *get (hb_user_data_key_t *key);
1.98 +
1.99 + inline void finish (void) { items.finish (lock); lock.finish (); }
1.100 +};
1.101 +
1.102 +
1.103 +/* object_header */
1.104 +
1.105 +struct hb_object_header_t
1.106 +{
1.107 + hb_reference_count_t ref_count;
1.108 + hb_user_data_array_t user_data;
1.109 +
1.110 +#define HB_OBJECT_HEADER_STATIC {HB_REFERENCE_COUNT_INVALID, HB_USER_DATA_ARRAY_INIT}
1.111 +
1.112 + static inline void *create (unsigned int size) {
1.113 + hb_object_header_t *obj = (hb_object_header_t *) calloc (1, size);
1.114 +
1.115 + if (likely (obj))
1.116 + obj->init ();
1.117 +
1.118 + return obj;
1.119 + }
1.120 +
1.121 + inline void init (void) {
1.122 + ref_count.init (1);
1.123 + user_data.init ();
1.124 + }
1.125 +
1.126 + inline bool is_inert (void) const {
1.127 + return unlikely (ref_count.is_invalid ());
1.128 + }
1.129 +
1.130 + inline void reference (void) {
1.131 + if (unlikely (!this || this->is_inert ()))
1.132 + return;
1.133 + ref_count.inc ();
1.134 + }
1.135 +
1.136 + inline bool destroy (void) {
1.137 + if (unlikely (!this || this->is_inert ()))
1.138 + return false;
1.139 + if (ref_count.dec () != 1)
1.140 + return false;
1.141 +
1.142 + ref_count.finish (); /* Do this before user_data */
1.143 + user_data.finish ();
1.144 +
1.145 + return true;
1.146 + }
1.147 +
1.148 + inline bool set_user_data (hb_user_data_key_t *key,
1.149 + void * data,
1.150 + hb_destroy_func_t destroy_func,
1.151 + hb_bool_t replace) {
1.152 + if (unlikely (!this || this->is_inert ()))
1.153 + return false;
1.154 +
1.155 + return user_data.set (key, data, destroy_func, replace);
1.156 + }
1.157 +
1.158 + inline void *get_user_data (hb_user_data_key_t *key) {
1.159 + if (unlikely (!this || this->is_inert ()))
1.160 + return NULL;
1.161 +
1.162 + return user_data.get (key);
1.163 + }
1.164 +
1.165 + inline void trace (const char *function) const {
1.166 + if (unlikely (!this)) return;
1.167 + /* TODO We cannot use DEBUG_MSG_FUNC here since that one currently only
1.168 + * prints the class name and throws away the template info. */
1.169 + DEBUG_MSG (OBJECT, (void *) this,
1.170 + "%s refcount=%d",
1.171 + function,
1.172 + this ? ref_count.ref_count : 0);
1.173 + }
1.174 +
1.175 + private:
1.176 + ASSERT_POD ();
1.177 +};
1.178 +
1.179 +
1.180 +/* object */
1.181 +
1.182 +template <typename Type>
1.183 +static inline void hb_object_trace (const Type *obj, const char *function)
1.184 +{
1.185 + obj->header.trace (function);
1.186 +}
1.187 +template <typename Type>
1.188 +static inline Type *hb_object_create (void)
1.189 +{
1.190 + Type *obj = (Type *) hb_object_header_t::create (sizeof (Type));
1.191 + hb_object_trace (obj, HB_FUNC);
1.192 + return obj;
1.193 +}
1.194 +template <typename Type>
1.195 +static inline bool hb_object_is_inert (const Type *obj)
1.196 +{
1.197 + return unlikely (obj->header.is_inert ());
1.198 +}
1.199 +template <typename Type>
1.200 +static inline Type *hb_object_reference (Type *obj)
1.201 +{
1.202 + hb_object_trace (obj, HB_FUNC);
1.203 + obj->header.reference ();
1.204 + return obj;
1.205 +}
1.206 +template <typename Type>
1.207 +static inline bool hb_object_destroy (Type *obj)
1.208 +{
1.209 + hb_object_trace (obj, HB_FUNC);
1.210 + return obj->header.destroy ();
1.211 +}
1.212 +template <typename Type>
1.213 +static inline bool hb_object_set_user_data (Type *obj,
1.214 + hb_user_data_key_t *key,
1.215 + void * data,
1.216 + hb_destroy_func_t destroy,
1.217 + hb_bool_t replace)
1.218 +{
1.219 + return obj->header.set_user_data (key, data, destroy, replace);
1.220 +}
1.221 +
1.222 +template <typename Type>
1.223 +static inline void *hb_object_get_user_data (Type *obj,
1.224 + hb_user_data_key_t *key)
1.225 +{
1.226 + return obj->header.get_user_data (key);
1.227 +}
1.228 +
1.229 +
1.230 +#endif /* HB_OBJECT_PRIVATE_HH */
