+ /** Image (which will be aligned) */
+ std::shared_ptr<Image> image;
+ /** log2 of any scaling down that has already been applied to the image;
+ * e.g. if the image is already half the size of the original, this value
+ * will be 1.
+ */
+ int log2_scaling;
+ /** true if there was an error during image decoding, otherwise false */
+ bool error;
+ };
+
+ /** @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 (
+ 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 (boost::optional<dcp::Size> = boost::optional<dcp::Size>()) const { return 0; }
+ virtual size_t memory_used () const = 0;