[surface] Pass a separate closure for the mime-type destroy notifier.

A limitation of the current API was that the destroy notifier was called
on the mime-data block. This prevents the user from passing in a pointer
to a managed block, for example a mime-data block belonging to a
ref-counted object. We can overcome this by allowing the user to specify
the closure to be used with the destroy notifier.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/cairo-png.c b/src/cairo-png.c
index a130ba25d..e8f61b5da 100644
--- a/src/cairo-png.c
+++ b/src/cairo-png.c
@@ -662,7 +662,8 @@ read_png (struct png_read_closure_t *png_closure)
 					  CAIRO_MIME_TYPE_PNG,
 					  mime_data,
 					  mime_data_length,
-					  free);
+					  free,
+					  mime_data);
     if (status) {
 	free (mime_data);
 	cairo_surface_destroy (surface);