[Bf-blender-cvs] SVN commit: /data/svn/bf-blender [42182] trunk/blender/source/blender/ blenlib: mempool utility function to get the element at an index BLI_mempool_findelem (), not used yet.

[Campbell Barton]

Revision: 42182
          
http://projects.blender.org/scm/viewvc.php?view=rev&root=bf-blender&revision=42182
Author:   campbellbarton
Date:     2011-11-27 01:20:08 +0000 (Sun, 27 Nov 2011)
Log Message:
-----------
mempool utility function to get the element at an index BLI_mempool_findelem(), 
not used yet.

Modified Paths:
--------------
    trunk/blender/source/blender/blenlib/BLI_mempool.h
    trunk/blender/source/blender/blenlib/intern/BLI_mempool.c

Modified: trunk/blender/source/blender/blenlib/BLI_mempool.h
===================================================================
--- trunk/blender/source/blender/blenlib/BLI_mempool.h  2011-11-26 21:42:04 UTC 
(rev 42181)
+++ trunk/blender/source/blender/blenlib/BLI_mempool.h  2011-11-27 01:20:08 UTC 
(rev 42182)
@@ -55,6 +55,7 @@
 void BLI_mempool_free(BLI_mempool *pool, void *addr);
 void BLI_mempool_destroy(BLI_mempool *pool);
 int BLI_mempool_count(BLI_mempool *pool);
+void *BLI_mempool_findelem(BLI_mempool *pool, const int index);
 
 /** iteration stuff.  note: this may easy to produce bugs with **/
 /*private structure*/

Modified: trunk/blender/source/blender/blenlib/intern/BLI_mempool.c
===================================================================
--- trunk/blender/source/blender/blenlib/intern/BLI_mempool.c   2011-11-26 
21:42:04 UTC (rev 42181)
+++ trunk/blender/source/blender/blenlib/intern/BLI_mempool.c   2011-11-27 
01:20:08 UTC (rev 42182)
@@ -68,8 +68,9 @@
 
 struct BLI_mempool {
        struct ListBase chunks;
-       int esize, csize, pchunk;        /* size of elements and chunks in bytes
-                                         * and number of elements per chunk*/
+       int esize;         /* element size in bytes */
+       int csize;         /* chunk size in bytes */
+       int pchunk;        /* number of elements per chunk */
        short use_sysmalloc, allow_iter;
        /* keeps aligned to 16 bits */
 
@@ -240,6 +241,23 @@
        }
 }
 
+void *BLI_mempool_findelem(BLI_mempool *pool, const int index)
+{
+       if ((index >= 0) && (index < pool->totused)) {
+               BLI_mempool_chunk *mpchunk;
+               int i= 0;
+
+               for (mpchunk = pool->chunks.first; mpchunk; mpchunk = 
mpchunk->next) {
+                       if (index < i + pool->pchunk) {
+                               return ((char *)mpchunk->data) + (pool->esize * 
(index - i));
+                       }
+                       i += pool->pchunk;
+               }
+       }
+
+       return NULL;
+}
+
 void BLI_mempool_iternew(BLI_mempool *pool, BLI_mempool_iter *iter)
 {
        if (!pool->allow_iter) {

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