These optimizations are for repeated images in a page.

 1.- Every repeated cache-served-image is decoded. The patch adds
an  extra  reference to the dicache entry, so only one of them is
decoded, and the imgbuf deletion is left to a_Dicache_cleanup.
 2.- Every repeated cache-served-image call copyRow for each row.
The patch avoids that.

 This  is  common  with  small  images  (e.g.  bullets),  but the
overhead may be not worth the patch...

1 files changed, 1 insertions, 0 deletions

diff --git a/src/png.c b/src/png.c
index f7e2de8d..10eec6f0 100644
--- a/src/png.c
+++ b/src/png.c
@@ -474,6 +474,7 @@ void *a_Png_image(const char *Type, void *Ptr, CA_Callback_t *Call,
       DicEntry = a_Dicache_add_entry(web->url);
       DicEntry->DecoderData =
          Png_new(web->Image, DicEntry->url, DicEntry->version);
+      a_Dicache_ref(DicEntry->url, DicEntry->version);
    } else {
       /* Repeated image */
       a_Dicache_ref(DicEntry->url, DicEntry->version);