public:
virtual ~ImageProxy () {}
- /** @param note Handler for any notes that occur.
+ struct Result {
+ Result (boost::shared_ptr<Image> image_, int log2_scaling_)
+ : image (image_)
+ , log2_scaling (log2_scaling_)
+ , error (false)
+ {}
+
+ Result (boost::shared_ptr<Image> image_, int log2_scaling_, bool error_)
+ : image (image_)
+ , log2_scaling (log2_scaling_)
+ , error (error_)
+ {}
+
+ /** Image (which will be aligned) */
+ boost::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.
- * @return Image (which must be aligned)
*/
- virtual boost::shared_ptr<Image> image (
- boost::optional<dcp::NoteHandler> note = boost::optional<dcp::NoteHandler> (),
+ virtual Result image (
boost::optional<dcp::Size> size = boost::optional<dcp::Size> ()
) const = 0;
virtual bool same (boost::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 void prepare (boost::optional<dcp::Size> = boost::optional<dcp::Size>()) const {}
- virtual AVPixelFormat pixel_format () const = 0;
+ virtual int prepare (boost::optional<dcp::Size> = boost::optional<dcp::Size>()) const { return 0; }
virtual size_t memory_used () const = 0;
};