+ /** @param log Log to write to, or 0.
+ * @param size Size that the returned image will be scaled to, in case this
+ * can be used as an optimisation.
+ */
+ virtual Result image (
+ Image::Alignment alignment,
+ boost::optional<dcp::Size> size = boost::optional<dcp::Size> ()
+ ) const = 0;
+
+ virtual void add_metadata (xmlpp::Node *) const = 0;
+ virtual void write_to_socket (std::shared_ptr<Socket>) const = 0;
+ /** @return true if our image is definitely the same as another, false if it is probably not */
+ virtual bool same (std::shared_ptr<const ImageProxy>) const = 0;
+ /** Do any useful work that would speed up a subsequent call to ::image().
+ * This method may be called in a different thread to image().
+ * @return log2 of any scaling down that will be applied to the image.
+ */
+ virtual int prepare (Image::Alignment, boost::optional<dcp::Size> = boost::optional<dcp::Size>()) const { return 0; }
+ virtual size_t memory_used () const = 0;