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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

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package java.awt.image;

import java.util.Hashtable;

/**

 * The interface for objects expressing interest in image data through

 * the ImageProducer interfaces.  When a consumer is added to an image

 * producer, the producer delivers all of the data about the image

 * using the method calls defined in this interface.

 *

 * @see ImageProducer

 *

 * @author      Jim Graham

 */

public interface ImageConsumer {

    /**

     * The dimensions of the source image are reported using the

     * setDimensions method call.

     * @param width the width of the source image

     * @param height the height of the source image

     */

    void setDimensions(int width, int height);

    /**

     * Sets the extensible list of properties associated with this image.

     * @param props the list of properties to be associated with this

     *        image

     */

    void setProperties(Hashtable<?,?> props);

    /**

     * Sets the ColorModel object used for the majority of

     * the pixels reported using the setPixels method

     * calls.  Note that each set of pixels delivered using setPixels

     * contains its own ColorModel object, so no assumption should

     * be made that this model will be the only one used in delivering

     * pixel values.  A notable case where multiple ColorModel objects

     * may be seen is a filtered image when for each set of pixels

     * that it filters, the filter

     * determines  whether the

     * pixels can be sent on untouched, using the original ColorModel,

     * or whether the pixels should be modified (filtered) and passed

     * on using a ColorModel more convenient for the filtering process.

     * @param model the specified <code>ColorModel</code>

     * @see ColorModel

     */

    void setColorModel(ColorModel model);

    /**

     * Sets the hints that the ImageConsumer uses to process the

     * pixels delivered by the ImageProducer.

     * The ImageProducer can deliver the pixels in any order, but

     * the ImageConsumer may be able to scale or convert the pixels

     * to the destination ColorModel more efficiently or with higher

     * quality if it knows some information about how the pixels will

     * be delivered up front.  The setHints method should be called

     * before any calls to any of the setPixels methods with a bit mask

     * of hints about the manner in which the pixels will be delivered.

     * If the ImageProducer does not follow the guidelines for the

     * indicated hint, the results are undefined.

     * @param hintflags a set of hints that the ImageConsumer uses to

     *        process the pixels

     */

    void setHints(int hintflags);

    /**

     * The pixels will be delivered in a random order.  This tells the

     * ImageConsumer not to use any optimizations that depend on the

     * order of pixel delivery, which should be the default assumption

     * in the absence of any call to the setHints method.

     * @see #setHints

     */

    int RANDOMPIXELORDER = 1;

    /**

     * The pixels will be delivered in top-down, left-to-right order.

     * @see #setHints

     */

    int TOPDOWNLEFTRIGHT = 2;

    /**

     * The pixels will be delivered in (multiples of) complete scanlines

     * at a time.

     * @see #setHints

     */

    int COMPLETESCANLINES = 4;

    /**

     * The pixels will be delivered in a single pass.  Each pixel will

     * appear in only one call to any of the setPixels methods.  An

     * example of an image format which does not meet this criterion

     * is a progressive JPEG image which defines pixels in multiple

     * passes, each more refined than the previous.

     * @see #setHints

     */

    int SINGLEPASS = 8;

    /**

     * The image contain a single static image.  The pixels will be defined

     * in calls to the setPixels methods and then the imageComplete method

     * will be called with the STATICIMAGEDONE flag after which no more

     * image data will be delivered.  An example of an image type which

     * would not meet these criteria would be the output of a video feed,

     * or the representation of a 3D rendering being manipulated

     * by the user.  The end of each frame in those types of images will

     * be indicated by calling imageComplete with the SINGLEFRAMEDONE flag.

     * @see #setHints

     * @see #imageComplete

     */

    int SINGLEFRAME = 16;

    /**

     * Delivers the pixels of the image with one or more calls

     * to this method.  Each call specifies the location and

     * size of the rectangle of source pixels that are contained in

     * the array of pixels.  The specified ColorModel object should

     * be used to convert the pixels into their corresponding color

     * and alpha components.  Pixel (m,n) is stored in the pixels array

     * at index (n * scansize + m + off).  The pixels delivered using

     * this method are all stored as bytes.

     * @param x the X coordinate of the upper-left corner of the

     *        area of pixels to be set

     * @param y the Y coordinate of the upper-left corner of the

     *        area of pixels to be set

     * @param w the width of the area of pixels

     * @param h the height of the area of pixels

     * @param model the specified <code>ColorModel</code>

     * @param pixels the array of pixels

     * @param off the offset into the <code>pixels</code> array

     * @param scansize the distance from one row of pixels to the next in

     * the <code>pixels</code> array

     * @see ColorModel

     */

    void setPixels(int x, int y, int w, int h,

                   ColorModel model, byte pixels[], int off, int scansize);

    /**

     * The pixels of the image are delivered using one or more calls

     * to the setPixels method.  Each call specifies the location and

     * size of the rectangle of source pixels that are contained in

     * the array of pixels.  The specified ColorModel object should

     * be used to convert the pixels into their corresponding color

     * and alpha components.  Pixel (m,n) is stored in the pixels array

     * at index (n * scansize + m + off).  The pixels delivered using

     * this method are all stored as ints.

     * this method are all stored as ints.

     * @param x the X coordinate of the upper-left corner of the

     *        area of pixels to be set

     * @param y the Y coordinate of the upper-left corner of the

     *        area of pixels to be set

     * @param w the width of the area of pixels

     * @param h the height of the area of pixels

     * @param model the specified <code>ColorModel</code>

     * @param pixels the array of pixels

     * @param off the offset into the <code>pixels</code> array

     * @param scansize the distance from one row of pixels to the next in

     * the <code>pixels</code> array

     * @see ColorModel

     */

    void setPixels(int x, int y, int w, int h,

                   ColorModel model, int pixels[], int off, int scansize);

    /**

     * The imageComplete method is called when the ImageProducer is

     * finished delivering all of the pixels that the source image

     * contains, or when a single frame of a multi-frame animation has

     * been completed, or when an error in loading or producing the

     * image has occured.  The ImageConsumer should remove itself from the

     * list of consumers registered with the ImageProducer at this time,

     * unless it is interested in successive frames.

     * @param status the status of image loading

     * @see ImageProducer#removeConsumer

     */

    void imageComplete(int status);

    /**

     * An error was encountered while producing the image.

     * @see #imageComplete

     */

    int IMAGEERROR = 1;

    /**

     * One frame of the image is complete but there are more frames

     * to be delivered.

     * @see #imageComplete

     */

    int SINGLEFRAMEDONE = 2;

    /**

     * The image is complete and there are no more pixels or frames

     * to be delivered.

     * @see #imageComplete

     */

    int STATICIMAGEDONE = 3;

    /**

     * The image creation process was deliberately aborted.

     * @see #imageComplete

     */

    int IMAGEABORTED = 4;

}