All Known Implementing Classes:
FilteredImageSource, MemoryImageSource, RenderableImageProducer
public interface ImageProducer
The interface for objects which can produce the image data for Images. Each image contains an ImageProducer which is used to reconstruct the image whenever it is needed, for example, when a new size of the Image is scaled, or when the width or height of the Image is being requested.
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public void addConsumer(ImageConsumer ic)
Registers 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.
Parameters:
ic - the specified ImageConsumer
See Also:
startProduction(java.awt.image.ImageConsumer)
public boolean isConsumer(ImageConsumer ic)
Determines if a
specified ImageConsumer object is currently registered with this ImageProducer as one of its consumers.
Parameters:
ic - the specified ImageConsumer
Returns:
true if the specified ImageConsumer is registered with this ImageProducer; false
otherwise.
public void removeConsumer(ImageConsumer ic)
Removes the
specified 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.
Parameters:
ic - the specified ImageConsumer
public void startProduction(ImageConsumer ic)
Registers the
specified 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 might 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.
Parameters:
ic - the specified ImageConsumer
See Also:
addConsumer(java.awt.image.ImageConsumer)
public void requestTopDownLeftRightResend(ImageConsumer ic)
Requests, on
behalf of the ImageConsumer, 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, 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();
Parameters:
ic - the specified ImageConsumer
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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more
detailed, developer-targeted descriptions, with conceptual overviews,
definitions of terms, workarounds, and working code examples.
Copyright 2003 Sun Microsystems