[PATCH] Introduce picture-object pool to avoid malloc/free overhead.

[Jonathan Morton]

---
 render/picture.c |   17 +++++++++++++++--
 1 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/render/picture.c b/render/picture.c
index 5f86c7c..c94add0 100644
--- a/render/picture.c
+++ b/render/picture.c
@@ -703,6 +703,11 @@ SetPictureToDefaults (PicturePtr    pPicture)
     pPicture->pSourcePict = 0;
 }
 
+/* Avoid calling malloc every time one of these is needed */
+#define PICTURE_POOL_SIZE (4)
+static PicturePtr PicturePool[PICTURE_POOL_SIZE] = {NULL};
+static uint32_t PicturePoolTop = 0;
+
 PicturePtr
 CreatePicture (Picture		pid,
 	       DrawablePtr	pDrawable,
@@ -715,7 +720,11 @@ CreatePicture (Picture		pid,
     PicturePtr		pPicture;
     PictureScreenPtr	ps = GetPictureScreen(pDrawable->pScreen);
 
-    pPicture = (PicturePtr)xalloc(sizeof(PictureRec));
+    if(PicturePoolTop)
+        pPicture = PicturePool[--PicturePoolTop];
+    else
+        pPicture = (PicturePtr)xalloc(sizeof(PictureRec));
+
     if (!pPicture)
     {
 	*error = BadAlloc;
@@ -1531,7 +1540,11 @@ FreePicture (pointer	value,
             }
         }
 	dixFreePrivates(pPicture->devPrivates);
-	xfree (pPicture);
+
+        if(PicturePoolTop < PICTURE_POOL_SIZE)
+            PicturePool[PicturePoolTop++] = pPicture;
+        else
+	    xfree (pPicture);
     }
     return Success;
 }
-- 
1.5.6.3


--=-sSulcgRJlPy19NpCTn/b--