[cairo] How to free the memory allocated by cairo_image_surface_create_for_png?

[Owen Taylor]

On Tue, 2005-04-05 at 15:02 +0800, Charles Wang wrote:
> Hi Carl:
> 
> Thanks for you quickly reply, got your idea. :)
> 
> I think you let me to do the following things:
> d = malloc(...);
> sr = cairo_image_surface_create_for_data(d, CAIRO_FORMAT_XXX, w, h,
> stride);
> cairo_surface_set_user_data(sr, "IMG", d, free);
> 
> It should be complex than just call
> 'caior_image_surface_assume_ownershipt_of_data' and might encounter key
> conflict problem, The prototype of user data destroy callback must also
> compatible with 'free' in libc, otherwise we have to define a callback
> for this common simple position.

(cairo_destroy_func_t)free will always work.  No cast is necessary.

						Owen

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