gfx/harfbuzz/src/hb-map.cc

   1 /*
   2  * Copyright © 2018  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 #include "hb-map.hh"
  28
  29
  30 /**
  31  * SECTION:hb-map
  32  * @title: hb-map
  33  * @short_description: Object representing integer to integer mapping
  34  * @include: hb.h
  35  *
  36  * Map objects are integer-to-integer hash-maps.  Currently they are
  37  * not used in the HarfBuzz public API, but are provided for client's
  38  * use if desired.
  39  **/
  40
  41
  42 /**
  43  * hb_map_create: (Xconstructor)
  44  *
  45  * Creates a new, initially empty map.
  46  *
  47  * Return value: (transfer full): The new #hb_map_t
  48  *
  49  * Since: 1.7.7
  50  **/
  51 hb_map_t *
  52 hb_map_create ()
  53 {
  54   hb_map_t *map;
  55
  56   if (!(map = hb_object_create<hb_map_t> ()))
  57     return hb_map_get_empty ();
  58
  59   map->init_shallow ();
  60
  61   return map;
  62 }
  63
  64 /**
  65  * hb_map_get_empty:
  66  *
  67  * Fetches the singleton empty #hb_map_t.
  68  *
  69  * Return value: (transfer full): The empty #hb_map_t
  70  *
  71  * Since: 1.7.7
  72  **/
  73 hb_map_t *
  74 hb_map_get_empty ()
  75 {
  76   return const_cast<hb_map_t *> (&Null (hb_map_t));
  77 }
  78
  79 /**
  80  * hb_map_reference: (skip)
  81  * @map: A map
  82  *
  83  * Increases the reference count on a map.
  84  *
  85  * Return value: (transfer full): The map
  86  *
  87  * Since: 1.7.7
  88  **/
  89 hb_map_t *
  90 hb_map_reference (hb_map_t *map)
  91 {
  92   return hb_object_reference (map);
  93 }
  94
  95 /**
  96  * hb_map_destroy: (skip)
  97  * @map: A map
  98  *
  99  * Decreases the reference count on a map. When
 100  * the reference count reaches zero, the map is
 101  * destroyed, freeing all memory.
 102  *
 103  * Since: 1.7.7
 104  **/
 105 void
 106 hb_map_destroy (hb_map_t *map)
 107 {
 108   if (!hb_object_destroy (map)) return;
 109
 110   map->fini_shallow ();
 111
 112   hb_free (map);
 113 }
 114
 115 /**
 116  * hb_map_set_user_data: (skip)
 117  * @map: A map
 118  * @key: The user-data key to set
 119  * @data: A pointer to the user data to set
 120  * @destroy: (nullable): A callback to call when @data is not needed anymore
 121  * @replace: Whether to replace an existing data with the same key
 122  *
 123  * Attaches a user-data key/data pair to the specified map.
 124  *
 125  * Return value: %true if success, %false otherwise
 126  *
 127  * Since: 1.7.7
 128  **/
 129 hb_bool_t
 130 hb_map_set_user_data (hb_map_t           *map,
 131                       hb_user_data_key_t *key,
 132                       void *              data,
 133                       hb_destroy_func_t   destroy,
 134                       hb_bool_t           replace)
 135 {
 136   return hb_object_set_user_data (map, key, data, destroy, replace);
 137 }
 138
 139 /**
 140  * hb_map_get_user_data: (skip)
 141  * @map: A map
 142  * @key: The user-data key to query
 143  *
 144  * Fetches the user data associated with the specified key,
 145  * attached to the specified map.
 146  *
 147  * Return value: (transfer none): A pointer to the user data
 148  *
 149  * Since: 1.7.7
 150  **/
 151 void *
 152 hb_map_get_user_data (hb_map_t           *map,
 153                       hb_user_data_key_t *key)
 154 {
 155   return hb_object_get_user_data (map, key);
 156 }
 157
 158
 159 /**
 160  * hb_map_allocation_successful:
 161  * @map: A map
 162  *
 163  * Tests whether memory allocation for a set was successful.
 164  *
 165  * Return value: %true if allocation succeeded, %false otherwise
 166  *
 167  * Since: 1.7.7
 168  **/
 169 hb_bool_t
 170 hb_map_allocation_successful (const hb_map_t  *map)
 171 {
 172   return map->successful;
 173 }
 174
 175
 176 /**
 177  * hb_map_set:
 178  * @map: A map
 179  * @key: The key to store in the map
 180  * @value: The value to store for @key
 181  *
 182  * Stores @key:@value in the map.
 183  *
 184  * Since: 1.7.7
 185  **/
 186 void
 187 hb_map_set (hb_map_t       *map,
 188             hb_codepoint_t  key,
 189             hb_codepoint_t  value)
 190 {
 191   /* Immutable-safe. */
 192   map->set (key, value);
 193 }
 194
 195 /**
 196  * hb_map_get:
 197  * @map: A map
 198  * @key: The key to query
 199  *
 200  * Fetches the value stored for @key in @map.
 201  *
 202  * Since: 1.7.7
 203  **/
 204 hb_codepoint_t
 205 hb_map_get (const hb_map_t *map,
 206             hb_codepoint_t  key)
 207 {
 208   return map->get (key);
 209 }
 210
 211 /**
 212  * hb_map_del:
 213  * @map: A map
 214  * @key: The key to delete
 215  *
 216  * Removes @key and its stored value from @map.
 217  *
 218  * Since: 1.7.7
 219  **/
 220 void
 221 hb_map_del (hb_map_t       *map,
 222             hb_codepoint_t  key)
 223 {
 224   /* Immutable-safe. */
 225   map->del (key);
 226 }
 227
 228 /**
 229  * hb_map_has:
 230  * @map: A map
 231  * @key: The key to query
 232  *
 233  * Tests whether @key is an element of @map.
 234  *
 235  * Return value: %true if @key is found in @map, %false otherwise
 236  *
 237  * Since: 1.7.7
 238  **/
 239 hb_bool_t
 240 hb_map_has (const hb_map_t *map,
 241             hb_codepoint_t  key)
 242 {
 243   return map->has (key);
 244 }
 245
 246
 247 /**
 248  * hb_map_clear:
 249  * @map: A map
 250  *
 251  * Clears out the contents of @map.
 252  *
 253  * Since: 1.7.7
 254  **/
 255 void
 256 hb_map_clear (hb_map_t *map)
 257 {
 258   return map->clear ();
 259 }
 260
 261 /**
 262  * hb_map_is_empty:
 263  * @map: A map
 264  *
 265  * Tests whether @map is empty (contains no elements).
 266  *
 267  * Return value: %true if @map is empty
 268  *
 269  * Since: 1.7.7
 270  **/
 271 hb_bool_t
 272 hb_map_is_empty (const hb_map_t *map)
 273 {
 274   return map->is_empty ();
 275 }
 276
 277 /**
 278  * hb_map_get_population:
 279  * @map: A map
 280  *
 281  * Returns the number of key-value pairs in the map.
 282  *
 283  * Return value: The population of @map
 284  *
 285  * Since: 1.7.7
 286  **/
 287 unsigned int
 288 hb_map_get_population (const hb_map_t *map)
 289 {
 290   return map->get_population ();
 291 }