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Class Acme.JPM.Decoders.ImageDecoder

java.lang.Object
   |
   +----Acme.JPM.Decoders.ImageDecoder

public abstract class ImageDecoder

extends Object

implements ImageProducer

A framework for classes that read in and decode an image in a particular file format.

This provides a very simplified rendition of the ImageProducer interface. It requires the decoder to read the image a row at a time. It requires use of the RGBdefault color model. If you want more flexibility you can always implement ImageProducer directly.

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See Also:

PpmDecoder, ImageEncoder

ImageDecoder(InputStream)

Constructor.

addConsumer(ImageConsumer)

This method is used to register an ImageConsumer with the ImageProducer for access to the image data during a later reconstruction of the Image.

isConsumer(ImageConsumer)

This method determines if a given ImageConsumer object is currently registered with this ImageProducer as one of its consumers.

removeConsumer(ImageConsumer)

This method removes the given ImageConsumer object from the list of consumers currently registered to receive image data.

requestTopDownLeftRightResend(ImageConsumer)

This method is used by an ImageConsumer to request that the ImageProducer attempt to resend the image data one more time in TOPDOWNLEFTRIGHT order so that higher quality conversion algorithms which depend on receiving pixels in order can be used to produce a better output version of the image.

startProduction(ImageConsumer)

This method both registers the given ImageConsumer object as a consumer and starts an immediate reconstruction of the image data which will then be delivered to this consumer and any other consumer which may have already been registered with the producer.

 public ImageDecoder(InputStream in)

Constructor.

Parameters:

in - The stream to read the bytes from.

 public void addConsumer(ImageConsumer ic)

This method is used to register an ImageConsumer with the ImageProducer for access to the image data during a later reconstruction of the Image. The ImageProducer may, at its discretion, start delivering the image data to the consumer using the ImageConsumer interface immediately, or when the next available image reconstruction is triggered by a call to the startProduction method.

See Also:

startProduction

 public boolean isConsumer(ImageConsumer ic)

This method determines if a given ImageConsumer object is currently registered with this ImageProducer as one of its consumers.

 public void removeConsumer(ImageConsumer ic)

This method removes the given ImageConsumer object from the list of consumers currently registered to receive image data. It is not considered an error to remove a consumer that is not currently registered. The ImageProducer should stop sending data to this consumer as soon as is feasible.

 public void startProduction(ImageConsumer ic)

This method both registers the given ImageConsumer object as a consumer and starts an immediate reconstruction of the image data which will then be delivered to this consumer and any other consumer which may have already been registered with the producer. This method differs from the addConsumer method in that a reproduction of the image data should be triggered as soon as possible.

See Also:

addConsumer

 public void requestTopDownLeftRightResend(ImageConsumer ic)

This method is used by an ImageConsumer to request that the ImageProducer attempt to resend the image data one more time in TOPDOWNLEFTRIGHT order so that higher quality conversion algorithms which depend on receiving pixels in order can be used to produce a better output version of the image. The ImageProducer is free to ignore this call if it cannot resend the data in that order. If the data can be resent, then the ImageProducer should respond by executing the following minimum set of ImageConsumer method calls:

     ic.setHints( TOPDOWNLEFTRIGHT | [otherhints] );
     ic.setPixels( [...] );    // as many times as needed
     ic.imageComplete( [status] );
 

See Also:

setHints

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