/*
 * Copyright (c) 2009, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package com.sun.javafx.iio;

import java.io.IOException;

/**
 * A loader for images stored in a given format.
 */
public interface ImageLoader {
    /**
     * Gets a description of the image format supported by this loader.
     *
     * @return a description of the image format handled by this loader.
     */
    ImageFormatDescription getFormatDescription();

//    String getInput();

//    void abort();
    /**
     * Disposes of any resources (such as native libraries) held by this loader.
     * Any further invocation of any methods on this object are undefined.
     */
    void dispose();

    /**
     * Adds a listener to monitor this loader.
     *
     * @param listener the listener to add.
     */
    void addListener(ImageLoadListener listener);

    /**
     * Removes a listener from the list of those monitoring this loader.
     * @param listener the listener to remove.
     */
    void removeListener(ImageLoadListener listener);

    /**
     * Loads the image at a given index in an image stream. If no image exists
     * at that index <code>null</code> will be returned.
     *
     * @param imageIndex the zero-relative index of the image to load.
     * @param width the desired image width. If non-positive,
     * an <code>IllegalArgumentException</code> will be thrown.
     * @param height the desired image height. If non-positive,
     * an <code>IllegalArgumentException</code> will be thrown.
     * @param preserveAspectRatio whether to preserve the width-to-height ratio
     * of the image.
     * @param smooth whether to use a smooth downscaling algorithm.
     * @return the image at the specified index or <code>null</code> on error.
     */
    public ImageFrame load(int imageIndex, int width, int height,
            boolean preserveAspectRatio, boolean smooth) throws IOException;
}