Interface ImageProducer
- 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.
- See Also:
ImageConsumer
Method Summary
Modifier and Type | Method | Description |
---|---|---|
void | addConsumer(ImageConsumer ic) | Registers an |
boolean | isConsumer(ImageConsumer ic) | Determines if a specified |
void | removeConsumer(ImageConsumer ic) | Removes the specified |
void | requestTopDownLeftRightResend(ImageConsumer ic) | Requests, on behalf of the |
void | startProduction(ImageConsumer ic) | Registers the specified |
Method Detail
addConsumer
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 specifiedImageConsumer
- See Also:
startProduction(java.awt.image.ImageConsumer)
isConsumer
boolean isConsumer(ImageConsumer ic)
Determines if a specified ImageConsumer
object is currently registered with this ImageProducer
as one of its consumers.
- Parameters:
-
ic
- the specifiedImageConsumer
- Returns:
-
true
if the specifiedImageConsumer
is registered with thisImageProducer
;false
otherwise.
removeConsumer
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 specifiedImageConsumer
startProduction
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 specifiedImageConsumer
- See Also:
addConsumer(java.awt.image.ImageConsumer)
requestTopDownLeftRightResend
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 specifiedImageConsumer
- See Also:
ImageConsumer.setHints(int)