java.awt.image.renderable
Class RenderableImageProducer

java.lang.Object
  java.awt.image.renderable.RenderableImageProducer

All Implemented Interfaces:

ImageProducer, Runnable

public class RenderableImageProducer

extends Object

implements ImageProducer, Runnable

An adapter class that implements ImageProducer to allow the asynchronous production of a RenderableImage. The size of the ImageConsumer is determined by the scale factor of the usr2dev transform in the RenderContext. If the RenderContext is null, the default rendering of the RenderableImage is used. This class implements an asynchronous production that produces the image in one thread at one resolution. This class may be subclassed to implement versions that will render the image using several threads. These threads could render either the same image at progressively better quality, or different sections of the image at a single resolution.

Field Summary

(package private) Vector	ics A Vector of image consumers.
(package private) RenderContext	rc The RenderContext to use for producing the image.
(package private) RenderableImage	rdblImage The RenderableImage source for the producer.

Constructor Summary

RenderableImageProducer(RenderableImage rdblImage, RenderContext rc)
Constructs a new RenderableImageProducer from a RenderableImage and a RenderContext.

Method Summary

void	addConsumer(ImageConsumer ic) Adds an ImageConsumer to the list of consumers interested in data for this image.
boolean	isConsumer(ImageConsumer ic) Determine if an ImageConsumer is on the list of consumers currently interested in data for this image.
void	removeConsumer(ImageConsumer ic) Remove an ImageConsumer from the list of consumers interested in data for this image.
void	requestTopDownLeftRightResend(ImageConsumer ic) Requests that a given ImageConsumer have the image data delivered one more time in top-down, left-right order.
void	run() The runnable method for this class.
void	setRenderContext(RenderContext rc) Sets a new RenderContext to use for the next startProduction() call.
void	startProduction(ImageConsumer ic) Adds an ImageConsumer to the list of consumers interested in data for this image, and immediately starts delivery of the image data through the ImageConsumer interface.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

rdblImage

RenderableImage rdblImage

The RenderableImage source for the producer.

rc

RenderContext rc

The RenderContext to use for producing the image.

ics

Vector ics

A Vector of image consumers.

Constructor Detail

RenderableImageProducer

public RenderableImageProducer(RenderableImage rdblImage,
                               RenderContext rc)

Constructs a new RenderableImageProducer from a RenderableImage and a RenderContext.

Parameters:

rdblImage - the RenderableImage to be rendered.

rc - the RenderContext to use for producing the pixels.

Method Detail

setRenderContext

public void setRenderContext(RenderContext rc)

Sets a new RenderContext to use for the next startProduction() call.

Parameters:

rc - the new RenderContext.

addConsumer

public void addConsumer(ImageConsumer ic)

Adds an ImageConsumer to the list of consumers interested in data for this image.

Specified by:

addConsumer in interface ImageProducer

Parameters:

ic - an ImageConsumer to be added to the interest list.

See Also:

ImageProducer.startProduction(java.awt.image.ImageConsumer)

isConsumer

public boolean isConsumer(ImageConsumer ic)

Determine if an ImageConsumer is on the list of consumers currently interested in data for this image.

Specified by:

isConsumer in interface ImageProducer

Parameters:

ic - the ImageConsumer to be checked.

Returns:

true if the ImageConsumer is on the list; false otherwise.

removeConsumer

public void removeConsumer(ImageConsumer ic)

Remove an ImageConsumer from the list of consumers interested in data for this image.

Specified by:

removeConsumer in interface ImageProducer

Parameters:

ic - the ImageConsumer to be removed.

startProduction

public void startProduction(ImageConsumer ic)

Adds an ImageConsumer to the list of consumers interested in data for this image, and immediately starts delivery of the image data through the ImageConsumer interface.

Specified by:

startProduction in interface ImageProducer

Parameters:

ic - the ImageConsumer to be added to the list of consumers.

See Also:

ImageProducer.addConsumer(java.awt.image.ImageConsumer)

requestTopDownLeftRightResend

public void requestTopDownLeftRightResend(ImageConsumer ic)

Requests that a given ImageConsumer have the image data delivered one more time in top-down, left-right order.

Specified by:

requestTopDownLeftRightResend in interface ImageProducer

Parameters:

ic - the ImageConsumer requesting the resend.

See Also:

ImageConsumer.setHints(int)

run

public void run()

The runnable method for this class. This will produce an image using the current RenderableImage and RenderContext and send it to all the ImageConsumer currently registered with this class.

Specified by:

run in interface Runnable

See Also:

Thread.run()