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Java™ Platform Standard Ed. 6 |
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public interface IIOReadUpdateListener
An interface used by ImageReader implementations to
notify callers of their image and thumbnail reading methods of
pixel updates.
ImageReader.addIIOReadUpdateListener(javax.imageio.event.IIOReadUpdateListener),
ImageReader.removeIIOReadUpdateListener(javax.imageio.event.IIOReadUpdateListener)| Method Summary | |
|---|---|
void |
imageUpdate(ImageReader source,
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. |
void |
passComplete(ImageReader source,
BufferedImage theImage)
Reports that the current read operation has completed a progressive pass. |
void |
passStarted(ImageReader source,
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. |
void |
thumbnailPassComplete(ImageReader source,
BufferedImage theThumbnail)
Reports that the current thumbnail read operation has completed a progressive pass. |
void |
thumbnailPassStarted(ImageReader source,
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. |
void |
thumbnailUpdate(ImageReader source,
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. |
| Method Detail |
|---|
void passStarted(ImageReader source,
BufferedImage theImage,
int pass,
int minPass,
int maxPass,
int minX,
int minY,
int periodX,
int periodY,
int[] bands)
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.
source - the ImageReader object calling this
method.theImage - the BufferedImage being updated.pass - the numer of the pass that is about to begin,
starting with 0.minPass - the index of the first pass that will be decoded.maxPass - the index of the last pass that will be decoded.minX - the X coordinate of the leftmost updated column
of pixels.minY - the Y coordinate of the uppermost updated row
of pixels.periodX - the horizontal spacing between updated pixels;
a value of 1 means no gaps.periodY - the vertical spacing between updated pixels;
a value of 1 means no gaps.bands - an array of ints indicating the the
set bands that may be updated.
void imageUpdate(ImageReader source,
BufferedImage theImage,
int minX,
int minY,
int width,
int height,
int periodX,
int periodY,
int[] bands)
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)
source - the ImageReader object calling this method.theImage - the BufferedImage being updated.minX - the X coordinate of the leftmost updated column
of pixels.minY - the Y coordinate of the uppermost updated row
of pixels.width - the number of updated pixels horizontally.height - the number of updated pixels vertically.periodX - the horizontal spacing between updated pixels;
a value of 1 means no gaps.periodY - the vertical spacing between updated pixels;
a value of 1 means no gaps.bands - an array of ints indicating which
bands are being updated.
void passComplete(ImageReader source,
BufferedImage theImage)
source - the ImageReader object calling this
method.theImage - the BufferedImage being updated.ImageReadParam.setSourceProgressivePasses(int, int)
void thumbnailPassStarted(ImageReader source,
BufferedImage theThumbnail,
int pass,
int minPass,
int maxPass,
int minX,
int minY,
int periodX,
int periodY,
int[] bands)
source - the ImageReader object calling this
method.theThumbnail - the BufferedImage thumbnail
being updated.pass - the numer of the pass that is about to begin,
starting with 0.minPass - the index of the first pass that will be decoded.maxPass - the index of the last pass that will be decoded.minX - the X coordinate of the leftmost updated column
of pixels.minY - the Y coordinate of the uppermost updated row
of pixels.periodX - the horizontal spacing between updated pixels;
a value of 1 means no gaps.periodY - the vertical spacing between updated pixels;
a value of 1 means no gaps.bands - an array of ints indicating the the
set bands that may be updated.passStarted(javax.imageio.ImageReader, java.awt.image.BufferedImage, int, int, int, int, int, int, int, int[])
void thumbnailUpdate(ImageReader source,
BufferedImage theThumbnail,
int minX,
int minY,
int width,
int height,
int periodX,
int periodY,
int[] bands)
source - the ImageReader object calling this method.theThumbnail - the BufferedImage thumbnail
being updated.minX - the X coordinate of the leftmost updated column
of pixels.minY - the Y coordinate of the uppermost updated row
of pixels.width - the number of updated pixels horizontally.height - the number of updated pixels vertically.periodX - the horizontal spacing between updated pixels;
a value of 1 means no gaps.periodY - the vertical spacing between updated pixels;
a value of 1 means no gaps.bands - an array of ints indicating which
bands are being updated.imageUpdate(javax.imageio.ImageReader, java.awt.image.BufferedImage, int, int, int, int, int, int, int[])
void thumbnailPassComplete(ImageReader source,
BufferedImage theThumbnail)
source - the ImageReader object calling this
method.theThumbnail - the BufferedImage thumbnail
being updated.passComplete(javax.imageio.ImageReader, java.awt.image.BufferedImage)
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Java™ Platform Standard Ed. 6 |
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