[cairo] [PATCH] Fix Analysis Surface Memleak

Carl Worth cworth at cworth.org
Thu Apr 27 06:03:20 PDT 2006

On Thu, 27 Apr 2006 08:40:39 -0400, "Dominic Lachowicz" wrote:
> Instead of introducing new API, maybe it would be better to instead
> implement surface_backend->finish_surface for the analysis surface if
> it's leaking memory. It would look something like the attached patch,
> with the "code goes here" part filled in.

Yes. it would be something like if the analysis surface we're leaking
memory on its own. But I don't see that, (I don't see the analysis
surface ever allocating anything on its own for that matter).

> On 4/27/06, Henning Noren <henning.noren.402 at student.lu.se> wrote:
> > Please double check that the second _cairo_analysis_surface_destroy
> > really is needed. All test seems to pass fine but I'm not that familiar
> > with the code.

Within the cairo implementation we generally only have generic
_destroy functions for "objects" with multiple variants. So making an
analysis-surface-specific variant of cairo_surface_destroy doesn't
match the style.

And the only thing you're actually freeing is the surface pointer
itself, which cairo_surface-destroy already does, (at least once it
has already been called enough times to cancel each call to
cairo_surface_reference). What looks obvious to me is that there is
one call to cairo_surface_destroy missing in a spot you've pointed

So I've gone ahead and committed what's below. Does that help with the
specific problem you were looking at, or is there some other
reference-counting problem here?


commit e1be80b02080955e29d17c50118471158593b86f
Author: Carl Worth <cworth at cworth.org>
Date:   Thu Apr 27 06:02:46 2006 -0700

    paginated: Remove memory leak of analysis surface from _paint_page
    Thanks to Henning Noren <henning.noren.402 at student.lu.se> for pointing this out.

diff --git a/src/cairo-paginated-surface.c b/src/cairo-paginated-surface.c
index b839556..da6a60b 100644
--- a/src/cairo-paginated-surface.c
+++ b/src/cairo-paginated-surface.c
@@ -241,6 +241,8 @@ _paint_page (cairo_paginated_surface_t *
 	_cairo_meta_surface_replay (surface->meta, surface->target);
+    cairo_surface_destroy (analysis);
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