libpad: add ix2_reset()

This basically amounts to adding a pad_reset() wrapper.

Also incorporated resets into the test, while fixing a stupid
bug there.

1 files changed, 19 insertions, 0 deletions

diff --git a/src/ix2.c b/src/ix2.c
index 3569ae6..9a8fd02 100644
--- a/src/ix2.c
+++ b/src/ix2.c
@@ -150,7 +150,9 @@ static void init_node(ix2_node_t *node, bb2f_t *aabb)
 	assert(node);
 	assert(aabb);
 
+	node->children = NULL;
 	INIT_LIST_HEAD(&node->objects);
+	node->n_objects = 0;
 
 	node->center.x = aabb->min.x;
 	node->center.y = aabb->min.y;
@@ -450,6 +452,23 @@ fail_ix2:
 }
 
 
+/* Reset the index ix2 to its state as-returned by ix2_new()
+ *
+ * Note this doesn't free memory, it just discards the index while keeping all
+ * the memory around in the caches for efficient reuse.
+ */
+void ix2_reset(ix2_t *ix2)
+{
+	assert(ix2);
+
+	pad_reset(ix2->node_pad);
+	pad_reset(ix2->ref_pad);
+	pad_reset(ix2->object_pad);
+
+	init_node(&ix2->root, &ix2->aabb);
+}
+
+
 /* Free the index ix2 and everything associated with it */
 /* Note the external objects which have been indexed are not freed */
 void ix2_free(ix2_t *ix2)