IIOReadUpdateListenerpublic interface IIOReadUpdateListener implements EventListenerAn interface used by ImageReader implementations to
notify callers of their image and thumbnail reading methods of
pixel updates. |
| Methods Summary |
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| public void | imageUpdate(javax.imageio.ImageReader source, java.awt.image.BufferedImage theImage, int minX, int minY, int width, int height, int periodX, int periodY, int[] bands)Reports that a given region of the image has been updated.
The application might choose to redisplay the specified area,
for example, in order to provide a progressive display effect,
or perform other incremental processing.
Note that different image format readers may produce
decoded pixels in a variety of different orders. Many readers
will produce pixels in a simple top-to-bottom,
left-to-right-order, but others may use multiple passes of
interlacing, tiling, etc. The sequence of updates may even
differ from call to call depending on network speeds, for
example. A call to this method does not guarantee that all the
specified pixels have actually been updated, only that some
activity has taken place within some subregion of the one
specified.
The particular ImageReader implementation may
choose how often to provide updates. Each update specifies
that a given region of the image has been updated since the
last update. A region is described by its spatial bounding box
(minX, minY, width, and
height); X and Y subsampling factors
(periodX and periodY); and a set of
updated bands (bands). For example, the update:
minX = 10
minY = 20
width = 3
height = 4
periodX = 2
periodY = 3
bands = { 1, 3 }
would indicate that bands 1 and 3 of the following pixels were
updated:
(10, 20) (12, 20) (14, 20)
(10, 23) (12, 23) (14, 23)
(10, 26) (12, 26) (14, 26)
(10, 29) (12, 29) (14, 29)
| | public void | passComplete(javax.imageio.ImageReader source, java.awt.image.BufferedImage theImage)Reports that the current read operation has completed a
progressive pass. Readers of formats that support
progressive encoding should use this to notify clients when
each pass is completed when reading a progressively
encoded image.
| | public void | passStarted(javax.imageio.ImageReader source, java.awt.image.BufferedImage theImage, int pass, int minPass, int maxPass, int minX, int minY, int periodX, int periodY, int[] bands)Reports that the current read operation is about to begin a
progressive pass. Readers of formats that support progressive
encoding should use this to notify clients when each pass is
completed when reading a progressively encoded image.
An estimate of the area that will be updated by the pass is
indicated by the minX, minY,
width, and height parameters. If the
pass is interlaced, that is, it only updates selected rows or
columns, the periodX and periodY
parameters will indicate the degree of subsampling. The set of
bands that may be affected is indicated by the value of
bands.
| | public void | thumbnailPassComplete(javax.imageio.ImageReader source, java.awt.image.BufferedImage theThumbnail)Reports that the current thumbnail read operation has completed
a progressive pass. Readers of formats that support
progressive encoding should use this to notify clients when
each pass is completed when reading a progressively encoded
thumbnail image.
| | public void | thumbnailPassStarted(javax.imageio.ImageReader source, java.awt.image.BufferedImage theThumbnail, int pass, int minPass, int maxPass, int minX, int minY, int periodX, int periodY, int[] bands)Reports that the current thumbnail read operation is about to
begin a progressive pass. Readers of formats that support
progressive encoding should use this to notify clients when
each pass is completed when reading a progressively encoded
thumbnail image.
| | public void | thumbnailUpdate(javax.imageio.ImageReader source, java.awt.image.BufferedImage theThumbnail, int minX, int minY, int width, int height, int periodX, int periodY, int[] bands)Reports that a given region of a thumbnail image has been updated.
The application might choose to redisplay the specified area,
for example, in order to provide a progressive display effect,
or perform other incremental processing.
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