[map] Track population and occupancy separately
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@ -57,6 +57,7 @@ struct hb_map_t
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hb_object_header_t header;
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ASSERT_POD ();
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bool in_error;
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unsigned int population; /* Not including tombstones. */
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unsigned int occupancy; /* Including tombstones. */
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unsigned int mask;
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unsigned int prime;
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@ -65,6 +66,7 @@ struct hb_map_t
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inline void init_shallow (void)
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{
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in_error = false;
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population = 0;
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occupancy = 0;
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mask = 0;
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prime = 0;
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@ -89,7 +91,7 @@ struct hb_map_t
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{
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if (unlikely (in_error)) return false;
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unsigned int power = _hb_bit_storage (occupancy * 2 + 8) - 1;
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unsigned int power = _hb_bit_storage (population * 2 + 8) - 1;
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unsigned int new_size = 1u << power;
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item_t *new_items = (item_t *) malloc ((size_t) new_size * sizeof (item_t));
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if (unlikely (!new_items))
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@ -103,6 +105,7 @@ struct hb_map_t
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item_t *old_items = items;
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/* Switch to new, empty, array. */
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population = 0;
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occupancy = 0;
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mask = new_size - 1;
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prime = prime_for (power);
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@ -121,14 +124,26 @@ struct hb_map_t
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inline void set (hb_codepoint_t key, hb_codepoint_t value)
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{
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if (unlikely (in_error)) return;
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if (unlikely (key == INVALID)) return;
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if ((occupancy + occupancy / 2) > mask && !resize ()) return;
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unsigned int i = bucket_for (key);
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if (items[i].key != key)
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if (value == INVALID && items[i].key != key)
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return; /* Trying to delete non-existent key. */
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/* Accounting. */
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if (items[i].is_tombstone ())
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occupancy--;
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else if (!items[i].is_unused ())
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{
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if (items[i].key == INVALID && key != INVALID)
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occupancy++;
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items[i].key = key;
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population--;
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occupancy--;
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}
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occupancy++;
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if (value != INVALID)
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population++;
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items[i].key = key;
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items[i].value = value;
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}
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inline hb_codepoint_t get (hb_codepoint_t key) const
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@ -141,10 +156,7 @@ struct hb_map_t
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inline void del (hb_codepoint_t key)
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{
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if (unlikely (in_error)) return;
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if (unlikely (!items)) return;
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unsigned int i = bucket_for (key);
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items[i].value = INVALID;
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set (key, INVALID);
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}
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inline bool has (hb_codepoint_t key) const
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{
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@ -53,6 +53,7 @@ hb_map_create (void)
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static const hb_map_t _hb_map_nil = {
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HB_OBJECT_HEADER_STATIC,
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true, /* in_error */
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0, /* population */
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0, /* occupancy */
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0, /* mask */
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0, /* prime */
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