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package javax.imageio;

import java.awt.Point;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.awt.image.Raster;
import java.awt.image.RenderedImage;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
import java.util.Set;
import javax.imageio.spi.ImageReaderSpi;
import javax.imageio.event.IIOReadWarningListener;
import javax.imageio.event.IIOReadProgressListener;
import javax.imageio.event.IIOReadUpdateListener;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.metadata.IIOMetadataFormatImpl;
import javax.imageio.stream.ImageInputStream;

An abstract superclass for parsing and decoding of images. This class must be subclassed by classes that read in images in the context of the Java Image I/O framework.

ImageReader objects are normally instantiated by the service provider interface (SPI) class for the specific format. Service provider classes (e.g., instances of ImageReaderSpi) are registered with the IIORegistry, which uses them for format recognition and presentation of available format readers and writers.

When an input source is set (using the setInput method), it may be marked as "seek forward only". This setting means that images contained within the input source will only be read in order, possibly allowing the reader to avoid caching portions of the input containing data associated with images that have been read previously.

See Also:
/** * An abstract superclass for parsing and decoding of images. This * class must be subclassed by classes that read in images in the * context of the Java Image I/O framework. * * <p> <code>ImageReader</code> objects are normally instantiated by * the service provider interface (SPI) class for the specific format. * Service provider classes (e.g., instances of * <code>ImageReaderSpi</code>) are registered with the * <code>IIORegistry</code>, which uses them for format recognition * and presentation of available format readers and writers. * * <p> When an input source is set (using the <code>setInput</code> * method), it may be marked as "seek forward only". This setting * means that images contained within the input source will only be * read in order, possibly allowing the reader to avoid caching * portions of the input containing data associated with images that * have been read previously. * * @see ImageWriter * @see javax.imageio.spi.IIORegistry * @see javax.imageio.spi.ImageReaderSpi * */
public abstract class ImageReader {
The ImageReaderSpi that instantiated this object, or null if its identity is not known or none exists. By default it is initialized to null.
/** * The <code>ImageReaderSpi</code> that instantiated this object, * or <code>null</code> if its identity is not known or none * exists. By default it is initialized to <code>null</code>. */
protected ImageReaderSpi originatingProvider;
The ImageInputStream or other Object by setInput and retrieved by getInput. By default it is initialized to null.
/** * The <code>ImageInputStream</code> or other * <code>Object</code> by <code>setInput</code> and retrieved * by <code>getInput</code>. By default it is initialized to * <code>null</code>. */
protected Object input = null;
true if the current input source has been marked as allowing only forward seeking by setInput. By default, the value is false.
See Also:
/** * <code>true</code> if the current input source has been marked * as allowing only forward seeking by <code>setInput</code>. By * default, the value is <code>false</code>. * * @see #minIndex * @see #setInput */
protected boolean seekForwardOnly = false;
true if the current input source has been marked as allowing metadata to be ignored by setInput. By default, the value is false.
See Also:
  • setInput
/** * <code>true</code> if the current input source has been marked * as allowing metadata to be ignored by <code>setInput</code>. * By default, the value is <code>false</code>. * * @see #setInput */
protected boolean ignoreMetadata = false;
The smallest valid index for reading, initially 0. When seekForwardOnly is true, various methods may throw an IndexOutOfBoundsException on an attempt to access data associate with an image having a lower index.
See Also:
/** * The smallest valid index for reading, initially 0. When * <code>seekForwardOnly</code> is <code>true</code>, various methods * may throw an <code>IndexOutOfBoundsException</code> on an * attempt to access data associate with an image having a lower * index. * * @see #seekForwardOnly * @see #setInput */
protected int minIndex = 0;
An array of Locales which may be used to localize warning messages, or null if localization is not supported.
/** * An array of <code>Locale</code>s which may be used to localize * warning messages, or <code>null</code> if localization is not * supported. */
protected Locale[] availableLocales = null;
The current Locale to be used for localization, or null if none has been set.
/** * The current <code>Locale</code> to be used for localization, or * <code>null</code> if none has been set. */
protected Locale locale = null;
A List of currently registered IIOReadWarningListeners, initialized by default to null, which is synonymous with an empty List.
/** * A <code>List</code> of currently registered * <code>IIOReadWarningListener</code>s, initialized by default to * <code>null</code>, which is synonymous with an empty * <code>List</code>. */
protected List<IIOReadWarningListener> warningListeners = null;
A List of the Locales associated with each currently registered IIOReadWarningListener, initialized by default to null, which is synonymous with an empty List.
/** * A <code>List</code> of the <code>Locale</code>s associated with * each currently registered <code>IIOReadWarningListener</code>, * initialized by default to <code>null</code>, which is * synonymous with an empty <code>List</code>. */
protected List<Locale> warningLocales = null;
A List of currently registered IIOReadProgressListeners, initialized by default to null, which is synonymous with an empty List.
/** * A <code>List</code> of currently registered * <code>IIOReadProgressListener</code>s, initialized by default * to <code>null</code>, which is synonymous with an empty * <code>List</code>. */
protected List<IIOReadProgressListener> progressListeners = null;
A List of currently registered IIOReadUpdateListeners, initialized by default to null, which is synonymous with an empty List.
/** * A <code>List</code> of currently registered * <code>IIOReadUpdateListener</code>s, initialized by default to * <code>null</code>, which is synonymous with an empty * <code>List</code>. */
protected List<IIOReadUpdateListener> updateListeners = null;
If true, the current read operation should be aborted.
/** * If <code>true</code>, the current read operation should be * aborted. */
private boolean abortFlag = false;
Constructs an ImageReader and sets its originatingProvider field to the supplied value.

Subclasses that make use of extensions should provide a constructor with signature (ImageReaderSpi, Object) in order to retrieve the extension object. If the extension object is unsuitable, an IllegalArgumentException should be thrown.

Params:
  • originatingProvider – the ImageReaderSpi that is invoking this constructor, or null.
/** * Constructs an <code>ImageReader</code> and sets its * <code>originatingProvider</code> field to the supplied value. * * <p> Subclasses that make use of extensions should provide a * constructor with signature <code>(ImageReaderSpi, * Object)</code> in order to retrieve the extension object. If * the extension object is unsuitable, an * <code>IllegalArgumentException</code> should be thrown. * * @param originatingProvider the <code>ImageReaderSpi</code> that is * invoking this constructor, or <code>null</code>. */
protected ImageReader(ImageReaderSpi originatingProvider) { this.originatingProvider = originatingProvider; }
Returns a String identifying the format of the input source.

The default implementation returns originatingProvider.getFormatNames()[0]. Implementations that may not have an originating service provider, or which desire a different naming policy should override this method.

Throws:
  • IOException – if an error occurs reading the information from the input source.
Returns:the format name, as a String.
/** * Returns a <code>String</code> identifying the format of the * input source. * * <p> The default implementation returns * <code>originatingProvider.getFormatNames()[0]</code>. * Implementations that may not have an originating service * provider, or which desire a different naming policy should * override this method. * * @exception IOException if an error occurs reading the * information from the input source. * * @return the format name, as a <code>String</code>. */
public String getFormatName() throws IOException { return originatingProvider.getFormatNames()[0]; }
Returns the ImageReaderSpi that was passed in on the constructor. Note that this value may be null.
See Also:
Returns:an ImageReaderSpi, or null.
/** * Returns the <code>ImageReaderSpi</code> that was passed in on * the constructor. Note that this value may be <code>null</code>. * * @return an <code>ImageReaderSpi</code>, or <code>null</code>. * * @see ImageReaderSpi */
public ImageReaderSpi getOriginatingProvider() { return originatingProvider; }
Sets the input source to use to the given ImageInputStream or other Object. The input source must be set before any of the query or read methods are used. If input is null, any currently set input source will be removed. In any case, the value of minIndex will be initialized to 0.

The seekForwardOnly parameter controls whether the value returned by getMinIndex will be increased as each image (or thumbnail, or image metadata) is read. If seekForwardOnly is true, then a call to read(index) will throw an IndexOutOfBoundsException if index < this.minIndex; otherwise, the value of minIndex will be set to index. If seekForwardOnly is false, the value of minIndex will remain 0 regardless of any read operations.

The ignoreMetadata parameter, if set to true, allows the reader to disregard any metadata encountered during the read. Subsequent calls to the getStreamMetadata and getImageMetadata methods may return null, and an IIOImage returned from readAll may return null from their getMetadata method. Setting this parameter may allow the reader to work more efficiently. The reader may choose to disregard this setting and return metadata normally.

Subclasses should take care to remove any cached information based on the previous stream, such as header information or partially decoded image data.

Use of a general Object other than an ImageInputStream is intended for readers that interact directly with a capture device or imaging protocol. The set of legal classes is advertised by the reader's service provider's getInputTypes method; most readers will return a single-element array containing only ImageInputStream.class to indicate that they accept only an ImageInputStream.

The default implementation checks the input argument against the list returned by originatingProvider.getInputTypes() and fails if the argument is not an instance of one of the classes in the list. If the originating provider is set to null, the input is accepted only if it is an ImageInputStream.

Params:
  • input – the ImageInputStream or other Object to use for future decoding.
  • seekForwardOnly – if true, images and metadata may only be read in ascending order from this input source.
  • ignoreMetadata – if true, metadata may be ignored during reads.
Throws:
  • IllegalArgumentException – if input is not an instance of one of the classes returned by the originating service provider's getInputTypes method, or is not an ImageInputStream.
See Also:
/** * Sets the input source to use to the given * <code>ImageInputStream</code> or other <code>Object</code>. * The input source must be set before any of the query or read * methods are used. If <code>input</code> is <code>null</code>, * any currently set input source will be removed. In any case, * the value of <code>minIndex</code> will be initialized to 0. * * <p> The <code>seekForwardOnly</code> parameter controls whether * the value returned by <code>getMinIndex</code> will be * increased as each image (or thumbnail, or image metadata) is * read. If <code>seekForwardOnly</code> is true, then a call to * <code>read(index)</code> will throw an * <code>IndexOutOfBoundsException</code> if <code>index &lt * this.minIndex</code>; otherwise, the value of * <code>minIndex</code> will be set to <code>index</code>. If * <code>seekForwardOnly</code> is <code>false</code>, the value of * <code>minIndex</code> will remain 0 regardless of any read * operations. * * <p> The <code>ignoreMetadata</code> parameter, if set to * <code>true</code>, allows the reader to disregard any metadata * encountered during the read. Subsequent calls to the * <code>getStreamMetadata</code> and * <code>getImageMetadata</code> methods may return * <code>null</code>, and an <code>IIOImage</code> returned from * <code>readAll</code> may return <code>null</code> from their * <code>getMetadata</code> method. Setting this parameter may * allow the reader to work more efficiently. The reader may * choose to disregard this setting and return metadata normally. * * <p> Subclasses should take care to remove any cached * information based on the previous stream, such as header * information or partially decoded image data. * * <p> Use of a general <code>Object</code> other than an * <code>ImageInputStream</code> is intended for readers that * interact directly with a capture device or imaging protocol. * The set of legal classes is advertised by the reader's service * provider's <code>getInputTypes</code> method; most readers * will return a single-element array containing only * <code>ImageInputStream.class</code> to indicate that they * accept only an <code>ImageInputStream</code>. * * <p> The default implementation checks the <code>input</code> * argument against the list returned by * <code>originatingProvider.getInputTypes()</code> and fails * if the argument is not an instance of one of the classes * in the list. If the originating provider is set to * <code>null</code>, the input is accepted only if it is an * <code>ImageInputStream</code>. * * @param input the <code>ImageInputStream</code> or other * <code>Object</code> to use for future decoding. * @param seekForwardOnly if <code>true</code>, images and metadata * may only be read in ascending order from this input source. * @param ignoreMetadata if <code>true</code>, metadata * may be ignored during reads. * * @exception IllegalArgumentException if <code>input</code> is * not an instance of one of the classes returned by the * originating service provider's <code>getInputTypes</code> * method, or is not an <code>ImageInputStream</code>. * * @see ImageInputStream * @see #getInput * @see javax.imageio.spi.ImageReaderSpi#getInputTypes */
public void setInput(Object input, boolean seekForwardOnly, boolean ignoreMetadata) { if (input != null) { boolean found = false; if (originatingProvider != null) { Class[] classes = originatingProvider.getInputTypes(); for (int i = 0; i < classes.length; i++) { if (classes[i].isInstance(input)) { found = true; break; } } } else { if (input instanceof ImageInputStream) { found = true; } } if (!found) { throw new IllegalArgumentException("Incorrect input type!"); } this.seekForwardOnly = seekForwardOnly; this.ignoreMetadata = ignoreMetadata; this.minIndex = 0; } this.input = input; }
Sets the input source to use to the given ImageInputStream or other Object. The input source must be set before any of the query or read methods are used. If input is null, any currently set input source will be removed. In any case, the value of minIndex will be initialized to 0.

The seekForwardOnly parameter controls whether the value returned by getMinIndex will be increased as each image (or thumbnail, or image metadata) is read. If seekForwardOnly is true, then a call to read(index) will throw an IndexOutOfBoundsException if index < this.minIndex; otherwise, the value of minIndex will be set to index. If seekForwardOnly is false, the value of minIndex will remain 0 regardless of any read operations.

This method is equivalent to setInput(input, seekForwardOnly, false).

Params:
  • input – the ImageInputStream or other Object to use for future decoding.
  • seekForwardOnly – if true, images and metadata may only be read in ascending order from this input source.
Throws:
  • IllegalArgumentException – if input is not an instance of one of the classes returned by the originating service provider's getInputTypes method, or is not an ImageInputStream.
See Also:
/** * Sets the input source to use to the given * <code>ImageInputStream</code> or other <code>Object</code>. * The input source must be set before any of the query or read * methods are used. If <code>input</code> is <code>null</code>, * any currently set input source will be removed. In any case, * the value of <code>minIndex</code> will be initialized to 0. * * <p> The <code>seekForwardOnly</code> parameter controls whether * the value returned by <code>getMinIndex</code> will be * increased as each image (or thumbnail, or image metadata) is * read. If <code>seekForwardOnly</code> is true, then a call to * <code>read(index)</code> will throw an * <code>IndexOutOfBoundsException</code> if <code>index &lt * this.minIndex</code>; otherwise, the value of * <code>minIndex</code> will be set to <code>index</code>. If * <code>seekForwardOnly</code> is <code>false</code>, the value of * <code>minIndex</code> will remain 0 regardless of any read * operations. * * <p> This method is equivalent to <code>setInput(input, * seekForwardOnly, false)</code>. * * @param input the <code>ImageInputStream</code> or other * <code>Object</code> to use for future decoding. * @param seekForwardOnly if <code>true</code>, images and metadata * may only be read in ascending order from this input source. * * @exception IllegalArgumentException if <code>input</code> is * not an instance of one of the classes returned by the * originating service provider's <code>getInputTypes</code> * method, or is not an <code>ImageInputStream</code>. * * @see #getInput */
public void setInput(Object input, boolean seekForwardOnly) { setInput(input, seekForwardOnly, false); }
Sets the input source to use to the given ImageInputStream or other Object. The input source must be set before any of the query or read methods are used. If input is null, any currently set input source will be removed. In any case, the value of minIndex will be initialized to 0.

This method is equivalent to setInput(input, false, false).

Params:
  • input – the ImageInputStream or other Object to use for future decoding.
Throws:
  • IllegalArgumentException – if input is not an instance of one of the classes returned by the originating service provider's getInputTypes method, or is not an ImageInputStream.
See Also:
/** * Sets the input source to use to the given * <code>ImageInputStream</code> or other <code>Object</code>. * The input source must be set before any of the query or read * methods are used. If <code>input</code> is <code>null</code>, * any currently set input source will be removed. In any case, * the value of <code>minIndex</code> will be initialized to 0. * * <p> This method is equivalent to <code>setInput(input, false, * false)</code>. * * @param input the <code>ImageInputStream</code> or other * <code>Object</code> to use for future decoding. * * @exception IllegalArgumentException if <code>input</code> is * not an instance of one of the classes returned by the * originating service provider's <code>getInputTypes</code> * method, or is not an <code>ImageInputStream</code>. * * @see #getInput */
public void setInput(Object input) { setInput(input, false, false); }
Returns the ImageInputStream or other Object previously set as the input source. If the input source has not been set, null is returned.
See Also:
Returns:the Object that will be used for future decoding, or null.
/** * Returns the <code>ImageInputStream</code> or other * <code>Object</code> previously set as the input source. If the * input source has not been set, <code>null</code> is returned. * * @return the <code>Object</code> that will be used for future * decoding, or <code>null</code>. * * @see ImageInputStream * @see #setInput */
public Object getInput() { return input; }
Returns true if the current input source has been marked as seek forward only by passing true as the seekForwardOnly argument to the setInput method.
See Also:
Returns:true if the input source is seek forward only.
/** * Returns <code>true</code> if the current input source has been * marked as seek forward only by passing <code>true</code> as the * <code>seekForwardOnly</code> argument to the * <code>setInput</code> method. * * @return <code>true</code> if the input source is seek forward * only. * * @see #setInput */
public boolean isSeekForwardOnly() { return seekForwardOnly; }
Returns true if the current input source has been marked as allowing metadata to be ignored by passing true as the ignoreMetadata argument to the setInput method.
See Also:
Returns:true if the metadata may be ignored.
/** * Returns <code>true</code> if the current input source has been * marked as allowing metadata to be ignored by passing * <code>true</code> as the <code>ignoreMetadata</code> argument * to the <code>setInput</code> method. * * @return <code>true</code> if the metadata may be ignored. * * @see #setInput */
public boolean isIgnoringMetadata() { return ignoreMetadata; }
Returns the lowest valid index for reading an image, thumbnail, or image metadata. If seekForwardOnly() is false, this value will typically remain 0, indicating that random access is possible. Otherwise, it will contain the value of the most recently accessed index, and increase in a monotonic fashion.
Returns:the minimum legal index for reading.
/** * Returns the lowest valid index for reading an image, thumbnail, * or image metadata. If <code>seekForwardOnly()</code> is * <code>false</code>, this value will typically remain 0, * indicating that random access is possible. Otherwise, it will * contain the value of the most recently accessed index, and * increase in a monotonic fashion. * * @return the minimum legal index for reading. */
public int getMinIndex() { return minIndex; } // Localization
Returns an array of Locales that may be used to localize warning listeners and compression settings. A return value of null indicates that localization is not supported.

The default implementation returns a clone of the availableLocales instance variable if it is non-null, or else returns null.

Returns:an array of Locales that may be used as arguments to setLocale, or null.
/** * Returns an array of <code>Locale</code>s that may be used to * localize warning listeners and compression settings. A return * value of <code>null</code> indicates that localization is not * supported. * * <p> The default implementation returns a clone of the * <code>availableLocales</code> instance variable if it is * non-<code>null</code>, or else returns <code>null</code>. * * @return an array of <code>Locale</code>s that may be used as * arguments to <code>setLocale</code>, or <code>null</code>. */
public Locale[] getAvailableLocales() { if (availableLocales == null) { return null; } else { return (Locale[])availableLocales.clone(); } }
Sets the current Locale of this ImageReader to the given value. A value of null removes any previous setting, and indicates that the reader should localize as it sees fit.
Params:
  • locale – the desired Locale, or null.
Throws:
See Also:
/** * Sets the current <code>Locale</code> of this * <code>ImageReader</code> to the given value. A value of * <code>null</code> removes any previous setting, and indicates * that the reader should localize as it sees fit. * * @param locale the desired <code>Locale</code>, or * <code>null</code>. * * @exception IllegalArgumentException if <code>locale</code> is * non-<code>null</code> but is not one of the values returned by * <code>getAvailableLocales</code>. * * @see #getLocale */
public void setLocale(Locale locale) { if (locale != null) { Locale[] locales = getAvailableLocales(); boolean found = false; if (locales != null) { for (int i = 0; i < locales.length; i++) { if (locale.equals(locales[i])) { found = true; break; } } } if (!found) { throw new IllegalArgumentException("Invalid locale!"); } } this.locale = locale; }
Returns the currently set Locale, or null if none has been set.
See Also:
Returns:the current Locale, or null.
/** * Returns the currently set <code>Locale</code>, or * <code>null</code> if none has been set. * * @return the current <code>Locale</code>, or <code>null</code>. * * @see #setLocale */
public Locale getLocale() { return locale; } // Image queries
Returns the number of images, not including thumbnails, available from the current input source.

Note that some image formats (such as animated GIF) do not specify how many images are present in the stream. Thus determining the number of images will require the entire stream to be scanned and may require memory for buffering. If images are to be processed in order, it may be more efficient to simply call read with increasing indices until an IndexOutOfBoundsException is thrown to indicate that no more images are available. The allowSearch parameter may be set to false to indicate that an exhaustive search is not desired; the return value will be -1 to indicate that a search is necessary. If the input has been specified with seekForwardOnly set to true, this method throws an IllegalStateException if allowSearch is set to true.

Params:
  • allowSearch – if true, the true number of images will be returned even if a search is required. If false, the reader may return -1 without performing the search.
Throws:
  • IllegalStateException – if the input source has not been set, or if the input has been specified with seekForwardOnly set to true.
  • IOException – if an error occurs reading the information from the input source.
See Also:
Returns:the number of images, as an int, or -1 if allowSearch is false and a search would be required.
/** * Returns the number of images, not including thumbnails, available * from the current input source. * * <p> Note that some image formats (such as animated GIF) do not * specify how many images are present in the stream. Thus * determining the number of images will require the entire stream * to be scanned and may require memory for buffering. If images * are to be processed in order, it may be more efficient to * simply call <code>read</code> with increasing indices until an * <code>IndexOutOfBoundsException</code> is thrown to indicate * that no more images are available. The * <code>allowSearch</code> parameter may be set to * <code>false</code> to indicate that an exhaustive search is not * desired; the return value will be <code>-1</code> to indicate * that a search is necessary. If the input has been specified * with <code>seekForwardOnly</code> set to <code>true</code>, * this method throws an <code>IllegalStateException</code> if * <code>allowSearch</code> is set to <code>true</code>. * * @param allowSearch if <code>true</code>, the true number of * images will be returned even if a search is required. If * <code>false</code>, the reader may return <code>-1</code> * without performing the search. * * @return the number of images, as an <code>int</code>, or * <code>-1</code> if <code>allowSearch</code> is * <code>false</code> and a search would be required. * * @exception IllegalStateException if the input source has not been set, * or if the input has been specified with <code>seekForwardOnly</code> * set to <code>true</code>. * @exception IOException if an error occurs reading the * information from the input source. * * @see #setInput */
public abstract int getNumImages(boolean allowSearch) throws IOException;
Returns the width in pixels of the given image within the input source.

If the image can be rendered to a user-specified size, then this method returns the default width.

Params:
  • imageIndex – the index of the image to be queried.
Throws:
Returns:the width of the image, as an int.
/** * Returns the width in pixels of the given image within the input * source. * * <p> If the image can be rendered to a user-specified size, then * this method returns the default width. * * @param imageIndex the index of the image to be queried. * * @return the width of the image, as an <code>int</code>. * * @exception IllegalStateException if the input source has not been set. * @exception IndexOutOfBoundsException if the supplied index is * out of bounds. * @exception IOException if an error occurs reading the width * information from the input source. */
public abstract int getWidth(int imageIndex) throws IOException;
Returns the height in pixels of the given image within the input source.

If the image can be rendered to a user-specified size, then this method returns the default height.

Params:
  • imageIndex – the index of the image to be queried.
Throws:
Returns:the height of the image, as an int.
/** * Returns the height in pixels of the given image within the * input source. * * <p> If the image can be rendered to a user-specified size, then * this method returns the default height. * * @param imageIndex the index of the image to be queried. * * @return the height of the image, as an <code>int</code>. * * @exception IllegalStateException if the input source has not been set. * @exception IndexOutOfBoundsException if the supplied index is * out of bounds. * @exception IOException if an error occurs reading the height * information from the input source. */
public abstract int getHeight(int imageIndex) throws IOException;
Returns true if the storage format of the given image places no inherent impediment on random access to pixels. For most compressed formats, such as JPEG, this method should return false, as a large section of the image in addition to the region of interest may need to be decoded.

This is merely a hint for programs that wish to be efficient; all readers must be able to read arbitrary regions as specified in an ImageReadParam.

Note that formats that return false from this method may nonetheless allow tiling (e.g. Restart Markers in JPEG), and random access will likely be reasonably efficient on tiles. See isImageTiled.

A reader for which all images are guaranteed to support easy random access, or are guaranteed not to support easy random access, may return true or false respectively without accessing any image data. In such cases, it is not necessary to throw an exception even if no input source has been set or the image index is out of bounds.

The default implementation returns false.

Params:
  • imageIndex – the index of the image to be queried.
Throws:
  • IllegalStateException – if an input source is required to determine the return value, but none has been set.
  • IndexOutOfBoundsException – if an image must be accessed to determine the return value, but the supplied index is out of bounds.
  • IOException – if an error occurs during reading.
Returns:true if reading a region of interest of the given image is likely to be efficient.
/** * Returns <code>true</code> if the storage format of the given * image places no inherent impediment on random access to pixels. * For most compressed formats, such as JPEG, this method should * return <code>false</code>, as a large section of the image in * addition to the region of interest may need to be decoded. * * <p> This is merely a hint for programs that wish to be * efficient; all readers must be able to read arbitrary regions * as specified in an <code>ImageReadParam</code>. * * <p> Note that formats that return <code>false</code> from * this method may nonetheless allow tiling (<i>e.g.</i> Restart * Markers in JPEG), and random access will likely be reasonably * efficient on tiles. See {@link #isImageTiled * <code>isImageTiled</code>}. * * <p> A reader for which all images are guaranteed to support * easy random access, or are guaranteed not to support easy * random access, may return <code>true</code> or * <code>false</code> respectively without accessing any image * data. In such cases, it is not necessary to throw an exception * even if no input source has been set or the image index is out * of bounds. * * <p> The default implementation returns <code>false</code>. * * @param imageIndex the index of the image to be queried. * * @return <code>true</code> if reading a region of interest of * the given image is likely to be efficient. * * @exception IllegalStateException if an input source is required * to determine the return value, but none has been set. * @exception IndexOutOfBoundsException if an image must be * accessed to determine the return value, but the supplied index * is out of bounds. * @exception IOException if an error occurs during reading. */
public boolean isRandomAccessEasy(int imageIndex) throws IOException { return false; }
Returns the aspect ratio of the given image (that is, its width divided by its height) as a float. For images that are inherently resizable, this method provides a way to determine the appropriate width given a desired height, or vice versa. For non-resizable images, the true width and height are used.

The default implementation simply returns (float)getWidth(imageIndex)/getHeight(imageIndex).

Params:
  • imageIndex – the index of the image to be queried.
Throws:
Returns:a float indicating the aspect ratio of the given image.
/** * Returns the aspect ratio of the given image (that is, its width * divided by its height) as a <code>float</code>. For images * that are inherently resizable, this method provides a way to * determine the appropriate width given a desired height, or vice * versa. For non-resizable images, the true width and height * are used. * * <p> The default implementation simply returns * <code>(float)getWidth(imageIndex)/getHeight(imageIndex)</code>. * * @param imageIndex the index of the image to be queried. * * @return a <code>float</code> indicating the aspect ratio of the * given image. * * @exception IllegalStateException if the input source has not been set. * @exception IndexOutOfBoundsException if the supplied index is * out of bounds. * @exception IOException if an error occurs during reading. */
public float getAspectRatio(int imageIndex) throws IOException { return (float)getWidth(imageIndex)/getHeight(imageIndex); }
Returns an ImageTypeSpecifier indicating the SampleModel and ColorModel which most closely represents the "raw" internal format of the image. For example, for a JPEG image the raw type might have a YCbCr color space even though the image would conventionally be transformed into an RGB color space prior to display. The returned value should also be included in the list of values returned by getImageTypes.

The default implementation simply returns the first entry from the list provided by getImageType.

Params:
  • imageIndex – the index of the image to be queried.
Throws:
Returns:an ImageTypeSpecifier.
/** * Returns an <code>ImageTypeSpecifier</code> indicating the * <code>SampleModel</code> and <code>ColorModel</code> which most * closely represents the "raw" internal format of the image. For * example, for a JPEG image the raw type might have a YCbCr color * space even though the image would conventionally be transformed * into an RGB color space prior to display. The returned value * should also be included in the list of values returned by * <code>getImageTypes</code>. * * <p> The default implementation simply returns the first entry * from the list provided by <code>getImageType</code>. * * @param imageIndex the index of the image to be queried. * * @return an <code>ImageTypeSpecifier</code>. * * @exception IllegalStateException if the input source has not been set. * @exception IndexOutOfBoundsException if the supplied index is * out of bounds. * @exception IOException if an error occurs reading the format * information from the input source. */
public ImageTypeSpecifier getRawImageType(int imageIndex) throws IOException { return (ImageTypeSpecifier)getImageTypes(imageIndex).next(); }
Returns an Iterator containing possible image types to which the given image may be decoded, in the form of ImageTypeSpecifierss. At least one legal image type will be returned.

The first element of the iterator should be the most "natural" type for decoding the image with as little loss as possible. For example, for a JPEG image the first entry should be an RGB image, even though the image data is stored internally in a YCbCr color space.

Params:
  • imageIndex – the index of the image to be retrieved.
Throws:
See Also:
Returns:an Iterator containing at least one ImageTypeSpecifier representing suggested image types for decoding the current given image.
/** * Returns an <code>Iterator</code> containing possible image * types to which the given image may be decoded, in the form of * <code>ImageTypeSpecifiers</code>s. At least one legal image * type will be returned. * * <p> The first element of the iterator should be the most * "natural" type for decoding the image with as little loss as * possible. For example, for a JPEG image the first entry should * be an RGB image, even though the image data is stored * internally in a YCbCr color space. * * @param imageIndex the index of the image to be * <code>retrieved</code>. * * @return an <code>Iterator</code> containing at least one * <code>ImageTypeSpecifier</code> representing suggested image * types for decoding the current given image. * * @exception IllegalStateException if the input source has not been set. * @exception IndexOutOfBoundsException if the supplied index is * out of bounds. * @exception IOException if an error occurs reading the format * information from the input source. * * @see ImageReadParam#setDestination(BufferedImage) * @see ImageReadParam#setDestinationType(ImageTypeSpecifier) */
public abstract Iterator<ImageTypeSpecifier> getImageTypes(int imageIndex) throws IOException;
Returns a default ImageReadParam object appropriate for this format. All subclasses should define a set of default values for all parameters and return them with this call. This method may be called before the input source is set.

The default implementation constructs and returns a new ImageReadParam object that does not allow source scaling (i.e., it returns new ImageReadParam().

Returns:an ImageReadParam object which may be used to control the decoding process using a set of default settings.
/** * Returns a default <code>ImageReadParam</code> object * appropriate for this format. All subclasses should define a * set of default values for all parameters and return them with * this call. This method may be called before the input source * is set. * * <p> The default implementation constructs and returns a new * <code>ImageReadParam</code> object that does not allow source * scaling (<i>i.e.</i>, it returns <code>new * ImageReadParam()</code>. * * @return an <code>ImageReadParam</code> object which may be used * to control the decoding process using a set of default settings. */
public ImageReadParam getDefaultReadParam() { return new ImageReadParam(); }
Returns an IIOMetadata object representing the metadata associated with the input source as a whole (i.e., not associated with any particular image), or null if the reader does not support reading metadata, is set to ignore metadata, or if no metadata is available.
Throws:
Returns:an IIOMetadata object, or null.
/** * Returns an <code>IIOMetadata</code> object representing the * metadata associated with the input source as a whole (i.e., not * associated with any particular image), or <code>null</code> if * the reader does not support reading metadata, is set to ignore * metadata, or if no metadata is available. * * @return an <code>IIOMetadata</code> object, or <code>null</code>. * * @exception IOException if an error occurs during reading. */
public abstract IIOMetadata getStreamMetadata() throws IOException;
Returns an IIOMetadata object representing the metadata associated with the input source as a whole (i.e., not associated with any particular image). If no such data exists, null is returned.

The resulting metadata object is only responsible for returning documents in the format named by formatName. Within any documents that are returned, only nodes whose names are members of nodeNames are required to be returned. In this way, the amount of metadata processing done by the reader may be kept to a minimum, based on what information is actually needed.

If formatName is not the name of a supported metadata format, null is returned.

In all cases, it is legal to return a more capable metadata object than strictly necessary. The format name and node names are merely hints that may be used to reduce the reader's workload.

The default implementation simply returns the result of calling getStreamMetadata(), after checking that the format name is supported. If it is not, null is returned.

Params:
  • formatName – a metadata format name that may be used to retrieve a document from the returned IIOMetadata object.
  • nodeNames – a Set containing the names of nodes that may be contained in a retrieved document.
Throws:
Returns:an IIOMetadata object, or null.
/** * Returns an <code>IIOMetadata</code> object representing the * metadata associated with the input source as a whole (i.e., * not associated with any particular image). If no such data * exists, <code>null</code> is returned. * * <p> The resulting metadata object is only responsible for * returning documents in the format named by * <code>formatName</code>. Within any documents that are * returned, only nodes whose names are members of * <code>nodeNames</code> are required to be returned. In this * way, the amount of metadata processing done by the reader may * be kept to a minimum, based on what information is actually * needed. * * <p> If <code>formatName</code> is not the name of a supported * metadata format, <code>null</code> is returned. * * <p> In all cases, it is legal to return a more capable metadata * object than strictly necessary. The format name and node names * are merely hints that may be used to reduce the reader's * workload. * * <p> The default implementation simply returns the result of * calling <code>getStreamMetadata()</code>, after checking that * the format name is supported. If it is not, * <code>null</code> is returned. * * @param formatName a metadata format name that may be used to retrieve * a document from the returned <code>IIOMetadata</code> object. * @param nodeNames a <code>Set</code> containing the names of * nodes that may be contained in a retrieved document. * * @return an <code>IIOMetadata</code> object, or <code>null</code>. * * @exception IllegalArgumentException if <code>formatName</code> * is <code>null</code>. * @exception IllegalArgumentException if <code>nodeNames</code> * is <code>null</code>. * @exception IOException if an error occurs during reading. */
public IIOMetadata getStreamMetadata(String formatName, Set<String> nodeNames) throws IOException { return getMetadata(formatName, nodeNames, true, 0); } private IIOMetadata getMetadata(String formatName, Set nodeNames, boolean wantStream, int imageIndex) throws IOException { if (formatName == null) { throw new IllegalArgumentException("formatName == null!"); } if (nodeNames == null) { throw new IllegalArgumentException("nodeNames == null!"); } IIOMetadata metadata = wantStream ? getStreamMetadata() : getImageMetadata(imageIndex); if (metadata != null) { if (metadata.isStandardMetadataFormatSupported() && formatName.equals (IIOMetadataFormatImpl.standardMetadataFormatName)) { return metadata; } String nativeName = metadata.getNativeMetadataFormatName(); if (nativeName != null && formatName.equals(nativeName)) { return metadata; } String[] extraNames = metadata.getExtraMetadataFormatNames(); if (extraNames != null) { for (int i = 0; i < extraNames.length; i++) { if (formatName.equals(extraNames[i])) { return metadata; } } } } return null; }
Returns an IIOMetadata object containing metadata associated with the given image, or null if the reader does not support reading metadata, is set to ignore metadata, or if no metadata is available.
Params:
  • imageIndex – the index of the image whose metadata is to be retrieved.
Throws:
Returns:an IIOMetadata object, or null.
/** * Returns an <code>IIOMetadata</code> object containing metadata * associated with the given image, or <code>null</code> if the * reader does not support reading metadata, is set to ignore * metadata, or if no metadata is available. * * @param imageIndex the index of the image whose metadata is to * be retrieved. * * @return an <code>IIOMetadata</code> object, or * <code>null</code>. * * @exception IllegalStateException if the input source has not been * set. * @exception IndexOutOfBoundsException if the supplied index is * out of bounds. * @exception IOException if an error occurs during reading. */
public abstract IIOMetadata getImageMetadata(int imageIndex) throws IOException;
Returns an IIOMetadata object representing the metadata associated with the given image, or null if the reader does not support reading metadata or none is available.

The resulting metadata object is only responsible for returning documents in the format named by formatName. Within any documents that are returned, only nodes whose names are members of nodeNames are required to be returned. In this way, the amount of metadata processing done by the reader may be kept to a minimum, based on what information is actually needed.

If formatName is not the name of a supported metadata format, null may be returned.

In all cases, it is legal to return a more capable metadata object than strictly necessary. The format name and node names are merely hints that may be used to reduce the reader's workload.

The default implementation simply returns the result of calling getImageMetadata(imageIndex), after checking that the format name is supported. If it is not, null is returned.

Params:
  • imageIndex – the index of the image whose metadata is to be retrieved.
  • formatName – a metadata format name that may be used to retrieve a document from the returned IIOMetadata object.
  • nodeNames – a Set containing the names of nodes that may be contained in a retrieved document.
Throws:
Returns:an IIOMetadata object, or null.
/** * Returns an <code>IIOMetadata</code> object representing the * metadata associated with the given image, or <code>null</code> * if the reader does not support reading metadata or none * is available. * * <p> The resulting metadata object is only responsible for * returning documents in the format named by * <code>formatName</code>. Within any documents that are * returned, only nodes whose names are members of * <code>nodeNames</code> are required to be returned. In this * way, the amount of metadata processing done by the reader may * be kept to a minimum, based on what information is actually * needed. * * <p> If <code>formatName</code> is not the name of a supported * metadata format, <code>null</code> may be returned. * * <p> In all cases, it is legal to return a more capable metadata * object than strictly necessary. The format name and node names * are merely hints that may be used to reduce the reader's * workload. * * <p> The default implementation simply returns the result of * calling <code>getImageMetadata(imageIndex)</code>, after * checking that the format name is supported. If it is not, * <code>null</code> is returned. * * @param imageIndex the index of the image whose metadata is to * be retrieved. * @param formatName a metadata format name that may be used to retrieve * a document from the returned <code>IIOMetadata</code> object. * @param nodeNames a <code>Set</code> containing the names of * nodes that may be contained in a retrieved document. * * @return an <code>IIOMetadata</code> object, or <code>null</code>. * * @exception IllegalStateException if the input source has not been * set. * @exception IndexOutOfBoundsException if the supplied index is * out of bounds. * @exception IllegalArgumentException if <code>formatName</code> * is <code>null</code>. * @exception IllegalArgumentException if <code>nodeNames</code> * is <code>null</code>. * @exception IOException if an error occurs during reading. */
public IIOMetadata getImageMetadata(int imageIndex, String formatName, Set<String> nodeNames) throws IOException { return getMetadata(formatName, nodeNames, false, imageIndex); }
Reads the image indexed by imageIndex and returns it as a complete BufferedImage, using a default ImageReadParam. This is a convenience method that calls read(imageIndex, null).

The image returned will be formatted according to the first ImageTypeSpecifier returned from getImageTypes.

Any registered IIOReadProgressListener objects will be notified by calling their imageStarted method, followed by calls to their imageProgress method as the read progresses. Finally their imageComplete method will be called. IIOReadUpdateListener objects may be updated at other times during the read as pixels are decoded. Finally, IIOReadWarningListener objects will receive notification of any non-fatal warnings that occur during decoding.

Params:
  • imageIndex – the index of the image to be retrieved.
Throws:
Returns:the desired portion of the image as a BufferedImage.
/** * Reads the image indexed by <code>imageIndex</code> and returns * it as a complete <code>BufferedImage</code>, using a default * <code>ImageReadParam</code>. This is a convenience method * that calls <code>read(imageIndex, null)</code>. * * <p> The image returned will be formatted according to the first * <code>ImageTypeSpecifier</code> returned from * <code>getImageTypes</code>. * * <p> Any registered <code>IIOReadProgressListener</code> objects * will be notified by calling their <code>imageStarted</code> * method, followed by calls to their <code>imageProgress</code> * method as the read progresses. Finally their * <code>imageComplete</code> method will be called. * <code>IIOReadUpdateListener</code> objects may be updated at * other times during the read as pixels are decoded. Finally, * <code>IIOReadWarningListener</code> objects will receive * notification of any non-fatal warnings that occur during * decoding. * * @param imageIndex the index of the image to be retrieved. * * @return the desired portion of the image as a * <code>BufferedImage</code>. * * @exception IllegalStateException if the input source has not been * set. * @exception IndexOutOfBoundsException if the supplied index is * out of bounds. * @exception IOException if an error occurs during reading. */
public BufferedImage read(int imageIndex) throws IOException { return read(imageIndex, null); }
Reads the image indexed by imageIndex and returns it as a complete BufferedImage, using a supplied ImageReadParam.

The actual BufferedImage returned will be chosen using the algorithm defined by the getDestination method.

Any registered IIOReadProgressListener objects will be notified by calling their imageStarted method, followed by calls to their imageProgress method as the read progresses. Finally their imageComplete method will be called. IIOReadUpdateListener objects may be updated at other times during the read as pixels are decoded. Finally, IIOReadWarningListener objects will receive notification of any non-fatal warnings that occur during decoding.

The set of source bands to be read and destination bands to be written is determined by calling getSourceBands and getDestinationBands on the supplied ImageReadParam. If the lengths of the arrays returned by these methods differ, the set of source bands contains an index larger that the largest available source index, or the set of destination bands contains an index larger than the largest legal destination index, an IllegalArgumentException is thrown.

If the supplied ImageReadParam contains optional setting values not supported by this reader (e.g. source render size or any format-specific settings), they will be ignored.

Params:
  • imageIndex – the index of the image to be retrieved.
  • param – an ImageReadParam used to control the reading process, or null.
Throws:
Returns:the desired portion of the image as a BufferedImage.
/** * Reads the image indexed by <code>imageIndex</code> and returns * it as a complete <code>BufferedImage</code>, using a supplied * <code>ImageReadParam</code>. * * <p> The actual <code>BufferedImage</code> returned will be * chosen using the algorithm defined by the * <code>getDestination</code> method. * * <p> Any registered <code>IIOReadProgressListener</code> objects * will be notified by calling their <code>imageStarted</code> * method, followed by calls to their <code>imageProgress</code> * method as the read progresses. Finally their * <code>imageComplete</code> method will be called. * <code>IIOReadUpdateListener</code> objects may be updated at * other times during the read as pixels are decoded. Finally, * <code>IIOReadWarningListener</code> objects will receive * notification of any non-fatal warnings that occur during * decoding. * * <p> The set of source bands to be read and destination bands to * be written is determined by calling <code>getSourceBands</code> * and <code>getDestinationBands</code> on the supplied * <code>ImageReadParam</code>. If the lengths of the arrays * returned by these methods differ, the set of source bands * contains an index larger that the largest available source * index, or the set of destination bands contains an index larger * than the largest legal destination index, an * <code>IllegalArgumentException</code> is thrown. * * <p> If the supplied <code>ImageReadParam</code> contains * optional setting values not supported by this reader (<i>e.g.</i> * source render size or any format-specific settings), they will * be ignored. * * @param imageIndex the index of the image to be retrieved. * @param param an <code>ImageReadParam</code> used to control * the reading process, or <code>null</code>. * * @return the desired portion of the image as a * <code>BufferedImage</code>. * * @exception IllegalStateException if the input source has not been * set. * @exception IndexOutOfBoundsException if the supplied index is * out of bounds. * @exception IllegalArgumentException if the set of source and * destination bands specified by * <code>param.getSourceBands</code> and * <code>param.getDestinationBands</code> differ in length or * include indices that are out of bounds. * @exception IllegalArgumentException if the resulting image would * have a width or height less than 1. * @exception IOException if an error occurs during reading. */
public abstract BufferedImage read(int imageIndex, ImageReadParam param) throws IOException;
Reads the image indexed by imageIndex and returns an IIOImage containing the image, thumbnails, and associated image metadata, using a supplied ImageReadParam.

The actual BufferedImage referenced by the returned IIOImage will be chosen using the algorithm defined by the getDestination method.

Any registered IIOReadProgressListener objects will be notified by calling their imageStarted method, followed by calls to their imageProgress method as the read progresses. Finally their imageComplete method will be called. IIOReadUpdateListener objects may be updated at other times during the read as pixels are decoded. Finally, IIOReadWarningListener objects will receive notification of any non-fatal warnings that occur during decoding.

The set of source bands to be read and destination bands to be written is determined by calling getSourceBands and getDestinationBands on the supplied ImageReadParam. If the lengths of the arrays returned by these methods differ, the set of source bands contains an index larger that the largest available source index, or the set of destination bands contains an index larger than the largest legal destination index, an IllegalArgumentException is thrown.

Thumbnails will be returned in their entirety regardless of the region settings.

If the supplied ImageReadParam contains optional setting values not supported by this reader (e.g. source render size or any format-specific settings), those values will be ignored.

Params:
  • imageIndex – the index of the image to be retrieved.
  • param – an ImageReadParam used to control the reading process, or null.
Throws:
Returns:an IIOImage containing the desired portion of the image, a set of thumbnails, and associated image metadata.
/** * Reads the image indexed by <code>imageIndex</code> and returns * an <code>IIOImage</code> containing the image, thumbnails, and * associated image metadata, using a supplied * <code>ImageReadParam</code>. * * <p> The actual <code>BufferedImage</code> referenced by the * returned <code>IIOImage</code> will be chosen using the * algorithm defined by the <code>getDestination</code> method. * * <p> Any registered <code>IIOReadProgressListener</code> objects * will be notified by calling their <code>imageStarted</code> * method, followed by calls to their <code>imageProgress</code> * method as the read progresses. Finally their * <code>imageComplete</code> method will be called. * <code>IIOReadUpdateListener</code> objects may be updated at * other times during the read as pixels are decoded. Finally, * <code>IIOReadWarningListener</code> objects will receive * notification of any non-fatal warnings that occur during * decoding. * * <p> The set of source bands to be read and destination bands to * be written is determined by calling <code>getSourceBands</code> * and <code>getDestinationBands</code> on the supplied * <code>ImageReadParam</code>. If the lengths of the arrays * returned by these methods differ, the set of source bands * contains an index larger that the largest available source * index, or the set of destination bands contains an index larger * than the largest legal destination index, an * <code>IllegalArgumentException</code> is thrown. * * <p> Thumbnails will be returned in their entirety regardless of * the region settings. * * <p> If the supplied <code>ImageReadParam</code> contains * optional setting values not supported by this reader (<i>e.g.</i> * source render size or any format-specific settings), those * values will be ignored. * * @param imageIndex the index of the image to be retrieved. * @param param an <code>ImageReadParam</code> used to control * the reading process, or <code>null</code>. * * @return an <code>IIOImage</code> containing the desired portion * of the image, a set of thumbnails, and associated image * metadata. * * @exception IllegalStateException if the input source has not been * set. * @exception IndexOutOfBoundsException if the supplied index is * out of bounds. * @exception IllegalArgumentException if the set of source and * destination bands specified by * <code>param.getSourceBands</code> and * <code>param.getDestinationBands</code> differ in length or * include indices that are out of bounds. * @exception IllegalArgumentException if the resulting image * would have a width or height less than 1. * @exception IOException if an error occurs during reading. */
public IIOImage readAll(int imageIndex, ImageReadParam param) throws IOException { if (imageIndex < getMinIndex()) { throw new IndexOutOfBoundsException("imageIndex < getMinIndex()!"); } BufferedImage im = read(imageIndex, param); ArrayList thumbnails = null; int numThumbnails = getNumThumbnails(imageIndex); if (numThumbnails > 0) { thumbnails = new ArrayList(); for (int j = 0; j < numThumbnails; j++) { thumbnails.add(readThumbnail(imageIndex, j)); } } IIOMetadata metadata = getImageMetadata(imageIndex); return new IIOImage(im, thumbnails, metadata); }
Returns an Iterator containing all the images, thumbnails, and metadata, starting at the index given by getMinIndex, from the input source in the form of IIOImage objects. An Iterator containing ImageReadParam objects is supplied; one element is consumed for each image read from the input source until no more images are available. If the read param Iterator runs out of elements, but there are still more images available from the input source, default read params are used for the remaining images.

If params is null, a default read param will be used for all images.

The actual BufferedImage referenced by the returned IIOImage will be chosen using the algorithm defined by the getDestination method.

Any registered IIOReadProgressListener objects will be notified by calling their sequenceStarted method once. Then, for each image decoded, there will be a call to imageStarted, followed by calls to imageProgress as the read progresses, and finally to imageComplete. The sequenceComplete method will be called after the last image has been decoded. IIOReadUpdateListener objects may be updated at other times during the read as pixels are decoded. Finally, IIOReadWarningListener objects will receive notification of any non-fatal warnings that occur during decoding.

The set of source bands to be read and destination bands to be written is determined by calling getSourceBands and getDestinationBands on the supplied ImageReadParam. If the lengths of the arrays returned by these methods differ, the set of source bands contains an index larger that the largest available source index, or the set of destination bands contains an index larger than the largest legal destination index, an IllegalArgumentException is thrown.

Thumbnails will be returned in their entirety regardless of the region settings.

If any of the supplied ImageReadParams contain optional setting values not supported by this reader (e.g. source render size or any format-specific settings), they will be ignored.

Params:
  • params – an Iterator containing ImageReadParam objects.
Throws:
See Also:
Returns:an Iterator representing the contents of the input source as IIOImages.
/** * Returns an <code>Iterator</code> containing all the images, * thumbnails, and metadata, starting at the index given by * <code>getMinIndex</code>, from the input source in the form of * <code>IIOImage</code> objects. An <code>Iterator</code> * containing <code>ImageReadParam</code> objects is supplied; one * element is consumed for each image read from the input source * until no more images are available. If the read param * <code>Iterator</code> runs out of elements, but there are still * more images available from the input source, default read * params are used for the remaining images. * * <p> If <code>params</code> is <code>null</code>, a default read * param will be used for all images. * * <p> The actual <code>BufferedImage</code> referenced by the * returned <code>IIOImage</code> will be chosen using the * algorithm defined by the <code>getDestination</code> method. * * <p> Any registered <code>IIOReadProgressListener</code> objects * will be notified by calling their <code>sequenceStarted</code> * method once. Then, for each image decoded, there will be a * call to <code>imageStarted</code>, followed by calls to * <code>imageProgress</code> as the read progresses, and finally * to <code>imageComplete</code>. The * <code>sequenceComplete</code> method will be called after the * last image has been decoded. * <code>IIOReadUpdateListener</code> objects may be updated at * other times during the read as pixels are decoded. Finally, * <code>IIOReadWarningListener</code> objects will receive * notification of any non-fatal warnings that occur during * decoding. * * <p> The set of source bands to be read and destination bands to * be written is determined by calling <code>getSourceBands</code> * and <code>getDestinationBands</code> on the supplied * <code>ImageReadParam</code>. If the lengths of the arrays * returned by these methods differ, the set of source bands * contains an index larger that the largest available source * index, or the set of destination bands contains an index larger * than the largest legal destination index, an * <code>IllegalArgumentException</code> is thrown. * * <p> Thumbnails will be returned in their entirety regardless of the * region settings. * * <p> If any of the supplied <code>ImageReadParam</code>s contain * optional setting values not supported by this reader (<i>e.g.</i> * source render size or any format-specific settings), they will * be ignored. * * @param params an <code>Iterator</code> containing * <code>ImageReadParam</code> objects. * * @return an <code>Iterator</code> representing the * contents of the input source as <code>IIOImage</code>s. * * @exception IllegalStateException if the input source has not been * set. * @exception IllegalArgumentException if any * non-<code>null</code> element of <code>params</code> is not an * <code>ImageReadParam</code>. * @exception IllegalArgumentException if the set of source and * destination bands specified by * <code>param.getSourceBands</code> and * <code>param.getDestinationBands</code> differ in length or * include indices that are out of bounds. * @exception IllegalArgumentException if a resulting image would * have a width or height less than 1. * @exception IOException if an error occurs during reading. * * @see ImageReadParam * @see IIOImage */
public Iterator<IIOImage> readAll(Iterator<? extends ImageReadParam> params) throws IOException { List output = new ArrayList(); int imageIndex = getMinIndex(); // Inform IIOReadProgressListeners we're starting a sequence processSequenceStarted(imageIndex); while (true) { // Inform IIOReadProgressListeners and IIOReadUpdateListeners // that we're starting a new image ImageReadParam param = null; if (params != null && params.hasNext()) { Object o = params.next(); if (o != null) { if (o instanceof ImageReadParam) { param = (ImageReadParam)o; } else { throw new IllegalArgumentException ("Non-ImageReadParam supplied as part of params!"); } } } BufferedImage bi = null; try { bi = read(imageIndex, param); } catch (IndexOutOfBoundsException e) { break; } ArrayList thumbnails = null; int numThumbnails = getNumThumbnails(imageIndex); if (numThumbnails > 0) { thumbnails = new ArrayList(); for (int j = 0; j < numThumbnails; j++) { thumbnails.add(readThumbnail(imageIndex, j)); } } IIOMetadata metadata = getImageMetadata(imageIndex); IIOImage im = new IIOImage(bi, thumbnails, metadata); output.add(im); ++imageIndex; } // Inform IIOReadProgressListeners we're ending a sequence processSequenceComplete(); return output.iterator(); }
Returns true if this plug-in supports reading just a Raster of pixel data. If this method returns false, calls to readRaster or readTileRaster will throw an UnsupportedOperationException.

The default implementation returns false.

See Also:
Returns:true if this plug-in supports reading raw Rasters.
/** * Returns <code>true</code> if this plug-in supports reading * just a {@link java.awt.image.Raster <code>Raster</code>} of pixel data. * If this method returns <code>false</code>, calls to * {@link #readRaster <code>readRaster</code>} or {@link #readTileRaster * <code>readTileRaster</code>} will throw an * <code>UnsupportedOperationException</code>. * * <p> The default implementation returns <code>false</code>. * * @return <code>true</code> if this plug-in supports reading raw * <code>Raster</code>s. * * @see #readRaster * @see #readTileRaster */
public boolean canReadRaster() { return false; }
Returns a new Raster object containing the raw pixel data from the image stream, without any color conversion applied. The application must determine how to interpret the pixel data by other means. Any destination or image-type parameters in the supplied ImageReadParam object are ignored, but all other parameters are used exactly as in the read method, except that any destination offset is used as a logical rather than a physical offset. The size of the returned Raster will always be that of the source region clipped to the actual image. Logical offsets in the stream itself are ignored.

This method allows formats that normally apply a color conversion, such as JPEG, and formats that do not normally have an associated colorspace, such as remote sensing or medical imaging data, to provide access to raw pixel data.

Any registered readUpdateListeners are ignored, as there is no BufferedImage, but all other listeners are called exactly as they are for the read method.

If canReadRaster() returns false, this method throws an UnsupportedOperationException.

If the supplied ImageReadParam contains optional setting values not supported by this reader (e.g. source render size or any format-specific settings), they will be ignored.

The default implementation throws an UnsupportedOperationException.

Params:
  • imageIndex – the index of the image to be read.
  • param – an ImageReadParam used to control the reading process, or null.
Throws:
See Also:
Returns:the desired portion of the image as a Raster.
/** * Returns a new <code>Raster</code> object containing the raw pixel data * from the image stream, without any color conversion applied. The * application must determine how to interpret the pixel data by other * means. Any destination or image-type parameters in the supplied * <code>ImageReadParam</code> object are ignored, but all other * parameters are used exactly as in the {@link #read <code>read</code>} * method, except that any destination offset is used as a logical rather * than a physical offset. The size of the returned <code>Raster</code> * will always be that of the source region clipped to the actual image. * Logical offsets in the stream itself are ignored. * * <p> This method allows formats that normally apply a color * conversion, such as JPEG, and formats that do not normally have an * associated colorspace, such as remote sensing or medical imaging data, * to provide access to raw pixel data. * * <p> Any registered <code>readUpdateListener</code>s are ignored, as * there is no <code>BufferedImage</code>, but all other listeners are * called exactly as they are for the {@link #read <code>read</code>} * method. * * <p> If {@link #canReadRaster <code>canReadRaster()</code>} returns * <code>false</code>, this method throws an * <code>UnsupportedOperationException</code>. * * <p> If the supplied <code>ImageReadParam</code> contains * optional setting values not supported by this reader (<i>e.g.</i> * source render size or any format-specific settings), they will * be ignored. * * <p> The default implementation throws an * <code>UnsupportedOperationException</code>. * * @param imageIndex the index of the image to be read. * @param param an <code>ImageReadParam</code> used to control * the reading process, or <code>null</code>. * * @return the desired portion of the image as a * <code>Raster</code>. * * @exception UnsupportedOperationException if this plug-in does not * support reading raw <code>Raster</code>s. * @exception IllegalStateException if the input source has not been * set. * @exception IndexOutOfBoundsException if the supplied index is * out of bounds. * @exception IOException if an error occurs during reading. * * @see #canReadRaster * @see #read * @see java.awt.image.Raster */
public Raster readRaster(int imageIndex, ImageReadParam param) throws IOException { throw new UnsupportedOperationException("readRaster not supported!"); }
Returns true if the image is organized into tiles, that is, equal-sized non-overlapping rectangles.

A reader plug-in may choose whether or not to expose tiling that is present in the image as it is stored. It may even choose to advertise tiling when none is explicitly present. In general, tiling should only be advertised if there is some advantage (in speed or space) to accessing individual tiles. Regardless of whether the reader advertises tiling, it must be capable of reading an arbitrary rectangular region specified in an ImageReadParam.

A reader for which all images are guaranteed to be tiled, or are guaranteed not to be tiled, may return true or false respectively without accessing any image data. In such cases, it is not necessary to throw an exception even if no input source has been set or the image index is out of bounds.

The default implementation just returns false.

Params:
  • imageIndex – the index of the image to be queried.
Throws:
  • IllegalStateException – if an input source is required to determine the return value, but none has been set.
  • IndexOutOfBoundsException – if an image must be accessed to determine the return value, but the supplied index is out of bounds.
  • IOException – if an error occurs during reading.
Returns:true if the image is tiled.
/** * Returns <code>true</code> if the image is organized into * <i>tiles</i>, that is, equal-sized non-overlapping rectangles. * * <p> A reader plug-in may choose whether or not to expose tiling * that is present in the image as it is stored. It may even * choose to advertise tiling when none is explicitly present. In * general, tiling should only be advertised if there is some * advantage (in speed or space) to accessing individual tiles. * Regardless of whether the reader advertises tiling, it must be * capable of reading an arbitrary rectangular region specified in * an <code>ImageReadParam</code>. * * <p> A reader for which all images are guaranteed to be tiled, * or are guaranteed not to be tiled, may return <code>true</code> * or <code>false</code> respectively without accessing any image * data. In such cases, it is not necessary to throw an exception * even if no input source has been set or the image index is out * of bounds. * * <p> The default implementation just returns <code>false</code>. * * @param imageIndex the index of the image to be queried. * * @return <code>true</code> if the image is tiled. * * @exception IllegalStateException if an input source is required * to determine the return value, but none has been set. * @exception IndexOutOfBoundsException if an image must be * accessed to determine the return value, but the supplied index * is out of bounds. * @exception IOException if an error occurs during reading. */
public boolean isImageTiled(int imageIndex) throws IOException { return false; }
Returns the width of a tile in the given image.

The default implementation simply returns getWidth(imageIndex), which is correct for non-tiled images. Readers that support tiling should override this method.

Params:
  • imageIndex – the index of the image to be queried.
Throws:
Returns:the width of a tile.
/** * Returns the width of a tile in the given image. * * <p> The default implementation simply returns * <code>getWidth(imageIndex)</code>, which is correct for * non-tiled images. Readers that support tiling should override * this method. * * @return the width of a tile. * * @param imageIndex the index of the image to be queried. * * @exception IllegalStateException if the input source has not been set. * @exception IndexOutOfBoundsException if the supplied index is * out of bounds. * @exception IOException if an error occurs during reading. */
public int getTileWidth(int imageIndex) throws IOException { return getWidth(imageIndex); }
Returns the height of a tile in the given image.

The default implementation simply returns getHeight(imageIndex), which is correct for non-tiled images. Readers that support tiling should override this method.

Params:
  • imageIndex – the index of the image to be queried.
Throws:
Returns:the height of a tile.
/** * Returns the height of a tile in the given image. * * <p> The default implementation simply returns * <code>getHeight(imageIndex)</code>, which is correct for * non-tiled images. Readers that support tiling should override * this method. * * @return the height of a tile. * * @param imageIndex the index of the image to be queried. * * @exception IllegalStateException if the input source has not been set. * @exception IndexOutOfBoundsException if the supplied index is * out of bounds. * @exception IOException if an error occurs during reading. */
public int getTileHeight(int imageIndex) throws IOException { return getHeight(imageIndex); }
Returns the X coordinate of the upper-left corner of tile (0, 0) in the given image.

A reader for which the tile grid X offset always has the same value (usually 0), may return the value without accessing any image data. In such cases, it is not necessary to throw an exception even if no input source has been set or the image index is out of bounds.

The default implementation simply returns 0, which is correct for non-tiled images and tiled images in most formats. Readers that support tiling with non-(0, 0) offsets should override this method.

Params:
  • imageIndex – the index of the image to be queried.
Throws:
  • IllegalStateException – if an input source is required to determine the return value, but none has been set.
  • IndexOutOfBoundsException – if an image must be accessed to determine the return value, but the supplied index is out of bounds.
  • IOException – if an error occurs during reading.
Returns:the X offset of the tile grid.
/** * Returns the X coordinate of the upper-left corner of tile (0, * 0) in the given image. * * <p> A reader for which the tile grid X offset always has the * same value (usually 0), may return the value without accessing * any image data. In such cases, it is not necessary to throw an * exception even if no input source has been set or the image * index is out of bounds. * * <p> The default implementation simply returns 0, which is * correct for non-tiled images and tiled images in most formats. * Readers that support tiling with non-(0, 0) offsets should * override this method. * * @return the X offset of the tile grid. * * @param imageIndex the index of the image to be queried. * * @exception IllegalStateException if an input source is required * to determine the return value, but none has been set. * @exception IndexOutOfBoundsException if an image must be * accessed to determine the return value, but the supplied index * is out of bounds. * @exception IOException if an error occurs during reading. */
public int getTileGridXOffset(int imageIndex) throws IOException { return 0; }
Returns the Y coordinate of the upper-left corner of tile (0, 0) in the given image.

A reader for which the tile grid Y offset always has the same value (usually 0), may return the value without accessing any image data. In such cases, it is not necessary to throw an exception even if no input source has been set or the image index is out of bounds.

The default implementation simply returns 0, which is correct for non-tiled images and tiled images in most formats. Readers that support tiling with non-(0, 0) offsets should override this method.

Params:
  • imageIndex – the index of the image to be queried.
Throws:
  • IllegalStateException – if an input source is required to determine the return value, but none has been set.
  • IndexOutOfBoundsException – if an image must be accessed to determine the return value, but the supplied index is out of bounds.
  • IOException – if an error occurs during reading.
Returns:the Y offset of the tile grid.
/** * Returns the Y coordinate of the upper-left corner of tile (0, * 0) in the given image. * * <p> A reader for which the tile grid Y offset always has the * same value (usually 0), may return the value without accessing * any image data. In such cases, it is not necessary to throw an * exception even if no input source has been set or the image * index is out of bounds. * * <p> The default implementation simply returns 0, which is * correct for non-tiled images and tiled images in most formats. * Readers that support tiling with non-(0, 0) offsets should * override this method. * * @return the Y offset of the tile grid. * * @param imageIndex the index of the image to be queried. * * @exception IllegalStateException if an input source is required * to determine the return value, but none has been set. * @exception IndexOutOfBoundsException if an image must be * accessed to determine the return value, but the supplied index * is out of bounds. * @exception IOException if an error occurs during reading. */
public int getTileGridYOffset(int imageIndex) throws IOException { return 0; }
Reads the tile indicated by the tileX and tileY arguments, returning it as a BufferedImage. If the arguments are out of range, an IllegalArgumentException is thrown. If the image is not tiled, the values 0, 0 will return the entire image; any other values will cause an IllegalArgumentException to be thrown.

This method is merely a convenience equivalent to calling read(int, ImageReadParam) with a read param specifying a source region having offsets of tileX*getTileWidth(imageIndex), tileY*getTileHeight(imageIndex) and width and height of getTileWidth(imageIndex), getTileHeight(imageIndex); and subsampling factors of 1 and offsets of 0. To subsample a tile, call read with a read param specifying this region and different subsampling parameters.

The default implementation returns the entire image if tileX and tileY are 0, or throws an IllegalArgumentException otherwise.

Params:
  • imageIndex – the index of the image to be retrieved.
  • tileX – the column index (starting with 0) of the tile to be retrieved.
  • tileY – the row index (starting with 0) of the tile to be retrieved.
Throws:
Returns:the tile as a BufferedImage.
/** * Reads the tile indicated by the <code>tileX</code> and * <code>tileY</code> arguments, returning it as a * <code>BufferedImage</code>. If the arguments are out of range, * an <code>IllegalArgumentException</code> is thrown. If the * image is not tiled, the values 0, 0 will return the entire * image; any other values will cause an * <code>IllegalArgumentException</code> to be thrown. * * <p> This method is merely a convenience equivalent to calling * <code>read(int, ImageReadParam)</code> with a read param * specifying a source region having offsets of * <code>tileX*getTileWidth(imageIndex)</code>, * <code>tileY*getTileHeight(imageIndex)</code> and width and * height of <code>getTileWidth(imageIndex)</code>, * <code>getTileHeight(imageIndex)</code>; and subsampling * factors of 1 and offsets of 0. To subsample a tile, call * <code>read</code> with a read param specifying this region * and different subsampling parameters. * * <p> The default implementation returns the entire image if * <code>tileX</code> and <code>tileY</code> are 0, or throws * an <code>IllegalArgumentException</code> otherwise. * * @param imageIndex the index of the image to be retrieved. * @param tileX the column index (starting with 0) of the tile * to be retrieved. * @param tileY the row index (starting with 0) of the tile * to be retrieved. * * @return the tile as a <code>BufferedImage</code>. * * @exception IllegalStateException if the input source has not been * set. * @exception IndexOutOfBoundsException if <code>imageIndex</code> * is out of bounds. * @exception IllegalArgumentException if the tile indices are * out of bounds. * @exception IOException if an error occurs during reading. */
public BufferedImage readTile(int imageIndex, int tileX, int tileY) throws IOException { if ((tileX != 0) || (tileY != 0)) { throw new IllegalArgumentException("Invalid tile indices"); } return read(imageIndex); }
Returns a new Raster object containing the raw pixel data from the tile, without any color conversion applied. The application must determine how to interpret the pixel data by other means.

If canReadRaster() returns false, this method throws an UnsupportedOperationException.

The default implementation checks if reading Rasters is supported, and if so calls readRaster(imageIndex, null) if tileX and tileY are 0, or throws an IllegalArgumentException otherwise.

Params:
  • imageIndex – the index of the image to be retrieved.
  • tileX – the column index (starting with 0) of the tile to be retrieved.
  • tileY – the row index (starting with 0) of the tile to be retrieved.
Throws:
See Also:
Returns:the tile as a Raster.
/** * Returns a new <code>Raster</code> object containing the raw * pixel data from the tile, without any color conversion applied. * The application must determine how to interpret the pixel data by other * means. * * <p> If {@link #canReadRaster <code>canReadRaster()</code>} returns * <code>false</code>, this method throws an * <code>UnsupportedOperationException</code>. * * <p> The default implementation checks if reading * <code>Raster</code>s is supported, and if so calls {@link * #readRaster <code>readRaster(imageIndex, null)</code>} if * <code>tileX</code> and <code>tileY</code> are 0, or throws an * <code>IllegalArgumentException</code> otherwise. * * @param imageIndex the index of the image to be retrieved. * @param tileX the column index (starting with 0) of the tile * to be retrieved. * @param tileY the row index (starting with 0) of the tile * to be retrieved. * * @return the tile as a <code>Raster</code>. * * @exception UnsupportedOperationException if this plug-in does not * support reading raw <code>Raster</code>s. * @exception IllegalArgumentException if the tile indices are * out of bounds. * @exception IllegalStateException if the input source has not been * set. * @exception IndexOutOfBoundsException if <code>imageIndex</code> * is out of bounds. * @exception IOException if an error occurs during reading. * * @see #readTile * @see #readRaster * @see java.awt.image.Raster */
public Raster readTileRaster(int imageIndex, int tileX, int tileY) throws IOException { if (!canReadRaster()) { throw new UnsupportedOperationException ("readTileRaster not supported!"); } if ((tileX != 0) || (tileY != 0)) { throw new IllegalArgumentException("Invalid tile indices"); } return readRaster(imageIndex, null); } // RenderedImages
Returns a RenderedImage object that contains the contents of the image indexed by imageIndex. By default, the returned image is simply the BufferedImage returned by read(imageIndex, param).

The semantics of this method may differ from those of the other read methods in several ways. First, any destination image and/or image type set in the ImageReadParam may be ignored. Second, the usual listener calls are not guaranteed to be made, or to be meaningful if they are. This is because the returned image may not be fully populated with pixel data at the time it is returned, or indeed at any time.

If the supplied ImageReadParam contains optional setting values not supported by this reader (e.g. source render size or any format-specific settings), they will be ignored.

The default implementation just calls read(imageIndex, param).

Params:
  • imageIndex – the index of the image to be retrieved.
  • param – an ImageReadParam used to control the reading process, or null.
Throws:
Returns:a RenderedImage object providing a view of the image.
/** * Returns a <code>RenderedImage</code> object that contains the * contents of the image indexed by <code>imageIndex</code>. By * default, the returned image is simply the * <code>BufferedImage</code> returned by <code>read(imageIndex, * param)</code>. * * <p> The semantics of this method may differ from those of the * other <code>read</code> methods in several ways. First, any * destination image and/or image type set in the * <code>ImageReadParam</code> may be ignored. Second, the usual * listener calls are not guaranteed to be made, or to be * meaningful if they are. This is because the returned image may * not be fully populated with pixel data at the time it is * returned, or indeed at any time. * * <p> If the supplied <code>ImageReadParam</code> contains * optional setting values not supported by this reader (<i>e.g.</i> * source render size or any format-specific settings), they will * be ignored. * * <p> The default implementation just calls {@link #read * <code>read(imageIndex, param)</code>}. * * @param imageIndex the index of the image to be retrieved. * @param param an <code>ImageReadParam</code> used to control * the reading process, or <code>null</code>. * * @return a <code>RenderedImage</code> object providing a view of * the image. * * @exception IllegalStateException if the input source has not been * set. * @exception IndexOutOfBoundsException if the supplied index is * out of bounds. * @exception IllegalArgumentException if the set of source and * destination bands specified by * <code>param.getSourceBands</code> and * <code>param.getDestinationBands</code> differ in length or * include indices that are out of bounds. * @exception IllegalArgumentException if the resulting image * would have a width or height less than 1. * @exception IOException if an error occurs during reading. */
public RenderedImage readAsRenderedImage(int imageIndex, ImageReadParam param) throws IOException { return read(imageIndex, param); } // Thumbnails
Returns true if the image format understood by this reader supports thumbnail preview images associated with it. The default implementation returns false.

If this method returns false, hasThumbnails and getNumThumbnails will return false and 0, respectively, and readThumbnail will throw an UnsupportedOperationException, regardless of their arguments.

A reader that does not support thumbnails need not implement any of the thumbnail-related methods.

Returns:true if thumbnails are supported.
/** * Returns <code>true</code> if the image format understood by * this reader supports thumbnail preview images associated with * it. The default implementation returns <code>false</code>. * * <p> If this method returns <code>false</code>, * <code>hasThumbnails</code> and <code>getNumThumbnails</code> * will return <code>false</code> and <code>0</code>, * respectively, and <code>readThumbnail</code> will throw an * <code>UnsupportedOperationException</code>, regardless of their * arguments. * * <p> A reader that does not support thumbnails need not * implement any of the thumbnail-related methods. * * @return <code>true</code> if thumbnails are supported. */
public boolean readerSupportsThumbnails() { return false; }
Returns true if the given image has thumbnail preview images associated with it. If the format does not support thumbnails (readerSupportsThumbnails returns false), false will be returned regardless of whether an input source has been set or whether imageIndex is in bounds.

The default implementation returns true if getNumThumbnails returns a value greater than 0.

Params:
  • imageIndex – the index of the image being queried.
Throws:
Returns:true if the given image has thumbnails.
/** * Returns <code>true</code> if the given image has thumbnail * preview images associated with it. If the format does not * support thumbnails (<code>readerSupportsThumbnails</code> * returns <code>false</code>), <code>false</code> will be * returned regardless of whether an input source has been set or * whether <code>imageIndex</code> is in bounds. * * <p> The default implementation returns <code>true</code> if * <code>getNumThumbnails</code> returns a value greater than 0. * * @param imageIndex the index of the image being queried. * * @return <code>true</code> if the given image has thumbnails. * * @exception IllegalStateException if the reader supports * thumbnails but the input source has not been set. * @exception IndexOutOfBoundsException if the reader supports * thumbnails but <code>imageIndex</code> is out of bounds. * @exception IOException if an error occurs during reading. */
public boolean hasThumbnails(int imageIndex) throws IOException { return getNumThumbnails(imageIndex) > 0; }
Returns the number of thumbnail preview images associated with the given image. If the format does not support thumbnails, (readerSupportsThumbnails returns false), 0 will be returned regardless of whether an input source has been set or whether imageIndex is in bounds.

The default implementation returns 0 without checking its argument.

Params:
  • imageIndex – the index of the image being queried.
Throws:
Returns:the number of thumbnails associated with the given image.
/** * Returns the number of thumbnail preview images associated with * the given image. If the format does not support thumbnails, * (<code>readerSupportsThumbnails</code> returns * <code>false</code>), <code>0</code> will be returned regardless * of whether an input source has been set or whether * <code>imageIndex</code> is in bounds. * * <p> The default implementation returns 0 without checking its * argument. * * @param imageIndex the index of the image being queried. * * @return the number of thumbnails associated with the given * image. * * @exception IllegalStateException if the reader supports * thumbnails but the input source has not been set. * @exception IndexOutOfBoundsException if the reader supports * thumbnails but <code>imageIndex</code> is out of bounds. * @exception IOException if an error occurs during reading. */
public int getNumThumbnails(int imageIndex) throws IOException { return 0; }
Returns the width of the thumbnail preview image indexed by thumbnailIndex, associated with the image indexed by ImageIndex.

If the reader does not support thumbnails, (readerSupportsThumbnails returns false), an UnsupportedOperationException will be thrown.

The default implementation simply returns readThumbnail(imageindex, thumbnailIndex).getWidth(). Subclasses should therefore override this method if possible in order to avoid forcing the thumbnail to be read.

Params:
  • imageIndex – the index of the image to be retrieved.
  • thumbnailIndex – the index of the thumbnail to be retrieved.
Throws:
Returns:the width of the desired thumbnail as an int.
/** * Returns the width of the thumbnail preview image indexed by * <code>thumbnailIndex</code>, associated with the image indexed * by <code>ImageIndex</code>. * * <p> If the reader does not support thumbnails, * (<code>readerSupportsThumbnails</code> returns * <code>false</code>), an <code>UnsupportedOperationException</code> * will be thrown. * * <p> The default implementation simply returns * <code>readThumbnail(imageindex, * thumbnailIndex).getWidth()</code>. Subclasses should therefore * override this method if possible in order to avoid forcing the * thumbnail to be read. * * @param imageIndex the index of the image to be retrieved. * @param thumbnailIndex the index of the thumbnail to be retrieved. * * @return the width of the desired thumbnail as an <code>int</code>. * * @exception UnsupportedOperationException if thumbnails are not * supported. * @exception IllegalStateException if the input source has not been set. * @exception IndexOutOfBoundsException if either of the supplied * indices are out of bounds. * @exception IOException if an error occurs during reading. */
public int getThumbnailWidth(int imageIndex, int thumbnailIndex) throws IOException { return readThumbnail(imageIndex, thumbnailIndex).getWidth(); }
Returns the height of the thumbnail preview image indexed by thumbnailIndex, associated with the image indexed by ImageIndex.

If the reader does not support thumbnails, (readerSupportsThumbnails returns false), an UnsupportedOperationException will be thrown.

The default implementation simply returns readThumbnail(imageindex, thumbnailIndex).getHeight(). Subclasses should therefore override this method if possible in order to avoid forcing the thumbnail to be read.

Params:
  • imageIndex – the index of the image to be retrieved.
  • thumbnailIndex – the index of the thumbnail to be retrieved.
Throws:
Returns:the height of the desired thumbnail as an int.
/** * Returns the height of the thumbnail preview image indexed by * <code>thumbnailIndex</code>, associated with the image indexed * by <code>ImageIndex</code>. * * <p> If the reader does not support thumbnails, * (<code>readerSupportsThumbnails</code> returns * <code>false</code>), an <code>UnsupportedOperationException</code> * will be thrown. * * <p> The default implementation simply returns * <code>readThumbnail(imageindex, * thumbnailIndex).getHeight()</code>. Subclasses should * therefore override this method if possible in order to avoid * forcing the thumbnail to be read. * * @param imageIndex the index of the image to be retrieved. * @param thumbnailIndex the index of the thumbnail to be retrieved. * * @return the height of the desired thumbnail as an <code>int</code>. * * @exception UnsupportedOperationException if thumbnails are not * supported. * @exception IllegalStateException if the input source has not been set. * @exception IndexOutOfBoundsException if either of the supplied * indices are out of bounds. * @exception IOException if an error occurs during reading. */
public int getThumbnailHeight(int imageIndex, int thumbnailIndex) throws IOException { return readThumbnail(imageIndex, thumbnailIndex).getHeight(); }
Returns the thumbnail preview image indexed by thumbnailIndex, associated with the image indexed by ImageIndex as a BufferedImage.

Any registered IIOReadProgressListener objects will be notified by calling their thumbnailStarted, thumbnailProgress, and thumbnailComplete methods.

If the reader does not support thumbnails, (readerSupportsThumbnails returns false), an UnsupportedOperationException will be thrown regardless of whether an input source has been set or whether the indices are in bounds.

The default implementation throws an UnsupportedOperationException.

Params:
  • imageIndex – the index of the image to be retrieved.
  • thumbnailIndex – the index of the thumbnail to be retrieved.
Throws:
Returns:the desired thumbnail as a BufferedImage.
/** * Returns the thumbnail preview image indexed by * <code>thumbnailIndex</code>, associated with the image indexed * by <code>ImageIndex</code> as a <code>BufferedImage</code>. * * <p> Any registered <code>IIOReadProgressListener</code> objects * will be notified by calling their * <code>thumbnailStarted</code>, <code>thumbnailProgress</code>, * and <code>thumbnailComplete</code> methods. * * <p> If the reader does not support thumbnails, * (<code>readerSupportsThumbnails</code> returns * <code>false</code>), an <code>UnsupportedOperationException</code> * will be thrown regardless of whether an input source has been * set or whether the indices are in bounds. * * <p> The default implementation throws an * <code>UnsupportedOperationException</code>. * * @param imageIndex the index of the image to be retrieved. * @param thumbnailIndex the index of the thumbnail to be retrieved. * * @return the desired thumbnail as a <code>BufferedImage</code>. * * @exception UnsupportedOperationException if thumbnails are not * supported. * @exception IllegalStateException if the input source has not been set. * @exception IndexOutOfBoundsException if either of the supplied * indices are out of bounds. * @exception IOException if an error occurs during reading. */
public BufferedImage readThumbnail(int imageIndex, int thumbnailIndex) throws IOException { throw new UnsupportedOperationException("Thumbnails not supported!"); } // Abort
Requests that any current read operation be aborted. The contents of the image following the abort will be undefined.

Readers should call clearAbortRequest at the beginning of each read operation, and poll the value of abortRequested regularly during the read.

/** * Requests that any current read operation be aborted. The * contents of the image following the abort will be undefined. * * <p> Readers should call <code>clearAbortRequest</code> at the * beginning of each read operation, and poll the value of * <code>abortRequested</code> regularly during the read. */
public synchronized void abort() { this.abortFlag = true; }
Returns true if a request to abort the current read operation has been made since the reader was instantiated or clearAbortRequest was called.
See Also:
Returns:true if the current read operation should be aborted.
/** * Returns <code>true</code> if a request to abort the current * read operation has been made since the reader was instantiated or * <code>clearAbortRequest</code> was called. * * @return <code>true</code> if the current read operation should * be aborted. * * @see #abort * @see #clearAbortRequest */
protected synchronized boolean abortRequested() { return this.abortFlag; }
Clears any previous abort request. After this method has been called, abortRequested will return false.
See Also:
/** * Clears any previous abort request. After this method has been * called, <code>abortRequested</code> will return * <code>false</code>. * * @see #abort * @see #abortRequested */
protected synchronized void clearAbortRequest() { this.abortFlag = false; } // Listeners // Add an element to a list, creating a new list if the // existing list is null, and return the list. static List addToList(List l, Object elt) { if (l == null) { l = new ArrayList(); } l.add(elt); return l; } // Remove an element from a list, discarding the list if the // resulting list is empty, and return the list or null. static List removeFromList(List l, Object elt) { if (l == null) { return l; } l.remove(elt); if (l.size() == 0) { l = null; } return l; }
Adds an IIOReadWarningListener to the list of registered warning listeners. If listener is null, no exception will be thrown and no action will be taken. Messages sent to the given listener will be localized, if possible, to match the current Locale. If no Locale has been set, warning messages may be localized as the reader sees fit.
Params:
  • listener – an IIOReadWarningListener to be registered.
See Also:
/** * Adds an <code>IIOReadWarningListener</code> to the list of * registered warning listeners. If <code>listener</code> is * <code>null</code>, no exception will be thrown and no action * will be taken. Messages sent to the given listener will be * localized, if possible, to match the current * <code>Locale</code>. If no <code>Locale</code> has been set, * warning messages may be localized as the reader sees fit. * * @param listener an <code>IIOReadWarningListener</code> to be registered. * * @see #removeIIOReadWarningListener */
public void addIIOReadWarningListener(IIOReadWarningListener listener) { if (listener == null) { return; } warningListeners = addToList(warningListeners, listener); warningLocales = addToList(warningLocales, getLocale()); }
Removes an IIOReadWarningListener from the list of registered error listeners. If the listener was not previously registered, or if listener is null, no exception will be thrown and no action will be taken.
Params:
  • listener – an IIOReadWarningListener to be unregistered.
See Also:
/** * Removes an <code>IIOReadWarningListener</code> from the list of * registered error listeners. If the listener was not previously * registered, or if <code>listener</code> is <code>null</code>, * no exception will be thrown and no action will be taken. * * @param listener an IIOReadWarningListener to be unregistered. * * @see #addIIOReadWarningListener */
public void removeIIOReadWarningListener(IIOReadWarningListener listener) { if (listener == null || warningListeners == null) { return; } int index = warningListeners.indexOf(listener); if (index != -1) { warningListeners.remove(index); warningLocales.remove(index); if (warningListeners.size() == 0) { warningListeners = null; warningLocales = null; } } }
Removes all currently registered IIOReadWarningListener objects.

The default implementation sets the warningListeners and warningLocales instance variables to null.

/** * Removes all currently registered * <code>IIOReadWarningListener</code> objects. * * <p> The default implementation sets the * <code>warningListeners</code> and <code>warningLocales</code> * instance variables to <code>null</code>. */
public void removeAllIIOReadWarningListeners() { warningListeners = null; warningLocales = null; }
Adds an IIOReadProgressListener to the list of registered progress listeners. If listener is null, no exception will be thrown and no action will be taken.
Params:
  • listener – an IIOReadProgressListener to be registered.
See Also:
/** * Adds an <code>IIOReadProgressListener</code> to the list of * registered progress listeners. If <code>listener</code> is * <code>null</code>, no exception will be thrown and no action * will be taken. * * @param listener an IIOReadProgressListener to be registered. * * @see #removeIIOReadProgressListener */
public void addIIOReadProgressListener(IIOReadProgressListener listener) { if (listener == null) { return; } progressListeners = addToList(progressListeners, listener); }
Removes an IIOReadProgressListener from the list of registered progress listeners. If the listener was not previously registered, or if listener is null, no exception will be thrown and no action will be taken.
Params:
  • listener – an IIOReadProgressListener to be unregistered.
See Also:
/** * Removes an <code>IIOReadProgressListener</code> from the list * of registered progress listeners. If the listener was not * previously registered, or if <code>listener</code> is * <code>null</code>, no exception will be thrown and no action * will be taken. * * @param listener an IIOReadProgressListener to be unregistered. * * @see #addIIOReadProgressListener */
public void removeIIOReadProgressListener (IIOReadProgressListener listener) { if (listener == null || progressListeners == null) { return; } progressListeners = removeFromList(progressListeners, listener); }
Removes all currently registered IIOReadProgressListener objects.

The default implementation sets the progressListeners instance variable to null.

/** * Removes all currently registered * <code>IIOReadProgressListener</code> objects. * * <p> The default implementation sets the * <code>progressListeners</code> instance variable to * <code>null</code>. */
public void removeAllIIOReadProgressListeners() { progressListeners = null; }
Adds an IIOReadUpdateListener to the list of registered update listeners. If listener is null, no exception will be thrown and no action will be taken. The listener will receive notification of pixel updates as images and thumbnails are decoded, including the starts and ends of progressive passes.

If no update listeners are present, the reader may choose to perform fewer updates to the pixels of the destination images and/or thumbnails, which may result in more efficient decoding.

For example, in progressive JPEG decoding each pass contains updates to a set of coefficients, which would have to be transformed into pixel values and converted to an RGB color space for each pass if listeners are present. If no listeners are present, the coefficients may simply be accumulated and the final results transformed and color converted one time only.

The final results of decoding will be the same whether or not intermediate updates are performed. Thus if only the final image is desired it may be preferable not to register any IIOReadUpdateListeners. In general, progressive updating is most effective when fetching images over a network connection that is very slow compared to local CPU processing; over a fast connection, progressive updates may actually slow down the presentation of the image.

Params:
  • listener – an IIOReadUpdateListener to be registered.
See Also:
/** * Adds an <code>IIOReadUpdateListener</code> to the list of * registered update listeners. If <code>listener</code> is * <code>null</code>, no exception will be thrown and no action * will be taken. The listener will receive notification of pixel * updates as images and thumbnails are decoded, including the * starts and ends of progressive passes. * * <p> If no update listeners are present, the reader may choose * to perform fewer updates to the pixels of the destination * images and/or thumbnails, which may result in more efficient * decoding. * * <p> For example, in progressive JPEG decoding each pass * contains updates to a set of coefficients, which would have to * be transformed into pixel values and converted to an RGB color * space for each pass if listeners are present. If no listeners * are present, the coefficients may simply be accumulated and the * final results transformed and color converted one time only. * * <p> The final results of decoding will be the same whether or * not intermediate updates are performed. Thus if only the final * image is desired it may be preferable not to register any * <code>IIOReadUpdateListener</code>s. In general, progressive * updating is most effective when fetching images over a network * connection that is very slow compared to local CPU processing; * over a fast connection, progressive updates may actually slow * down the presentation of the image. * * @param listener an IIOReadUpdateListener to be registered. * * @see #removeIIOReadUpdateListener */
public void addIIOReadUpdateListener(IIOReadUpdateListener listener) { if (listener == null) { return; } updateListeners = addToList(updateListeners, listener); }
Removes an IIOReadUpdateListener from the list of registered update listeners. If the listener was not previously registered, or if listener is null, no exception will be thrown and no action will be taken.
Params:
  • listener – an IIOReadUpdateListener to be unregistered.
See Also:
/** * Removes an <code>IIOReadUpdateListener</code> from the list of * registered update listeners. If the listener was not * previously registered, or if <code>listener</code> is * <code>null</code>, no exception will be thrown and no action * will be taken. * * @param listener an IIOReadUpdateListener to be unregistered. * * @see #addIIOReadUpdateListener */
public void removeIIOReadUpdateListener(IIOReadUpdateListener listener) { if (listener == null || updateListeners == null) { return; } updateListeners = removeFromList(updateListeners, listener); }
Removes all currently registered IIOReadUpdateListener objects.

The default implementation sets the updateListeners instance variable to null.

/** * Removes all currently registered * <code>IIOReadUpdateListener</code> objects. * * <p> The default implementation sets the * <code>updateListeners</code> instance variable to * <code>null</code>. */
public void removeAllIIOReadUpdateListeners() { updateListeners = null; }
Broadcasts the start of an sequence of image reads to all registered IIOReadProgressListeners by calling their sequenceStarted method. Subclasses may use this method as a convenience.
Params:
  • minIndex – the lowest index being read.
/** * Broadcasts the start of an sequence of image reads to all * registered <code>IIOReadProgressListener</code>s by calling * their <code>sequenceStarted</code> method. Subclasses may use * this method as a convenience. * * @param minIndex the lowest index being read. */
protected void processSequenceStarted(int minIndex) { if (progressListeners == null) { return; } int numListeners = progressListeners.size(); for (int i = 0; i < numListeners; i++) { IIOReadProgressListener listener = (IIOReadProgressListener)progressListeners.get(i); listener.sequenceStarted(this, minIndex); } }
Broadcasts the completion of an sequence of image reads to all registered IIOReadProgressListeners by calling their sequenceComplete method. Subclasses may use this method as a convenience.
/** * Broadcasts the completion of an sequence of image reads to all * registered <code>IIOReadProgressListener</code>s by calling * their <code>sequenceComplete</code> method. Subclasses may use * this method as a convenience. */
protected void processSequenceComplete() { if (progressListeners == null) { return; } int numListeners = progressListeners.size(); for (int i = 0; i < numListeners; i++) { IIOReadProgressListener listener = (IIOReadProgressListener)progressListeners.get(i); listener.sequenceComplete(this); } }
Broadcasts the start of an image read to all registered IIOReadProgressListeners by calling their imageStarted method. Subclasses may use this method as a convenience.
Params:
  • imageIndex – the index of the image about to be read.
/** * Broadcasts the start of an image read to all registered * <code>IIOReadProgressListener</code>s by calling their * <code>imageStarted</code> method. Subclasses may use this * method as a convenience. * * @param imageIndex the index of the image about to be read. */
protected void processImageStarted(int imageIndex) { if (progressListeners == null) { return; } int numListeners = progressListeners.size(); for (int i = 0; i < numListeners; i++) { IIOReadProgressListener listener = (IIOReadProgressListener)progressListeners.get(i); listener.imageStarted(this, imageIndex); } }
Broadcasts the current percentage of image completion to all registered IIOReadProgressListeners by calling their imageProgress method. Subclasses may use this method as a convenience.
Params:
  • percentageDone – the current percentage of completion, as a float.
/** * Broadcasts the current percentage of image completion to all * registered <code>IIOReadProgressListener</code>s by calling * their <code>imageProgress</code> method. Subclasses may use * this method as a convenience. * * @param percentageDone the current percentage of completion, * as a <code>float</code>. */
protected void processImageProgress(float percentageDone) { if (progressListeners == null) { return; } int numListeners = progressListeners.size(); for (int i = 0; i < numListeners; i++) { IIOReadProgressListener listener = (IIOReadProgressListener)progressListeners.get(i); listener.imageProgress(this, percentageDone); } }
Broadcasts the completion of an image read to all registered IIOReadProgressListeners by calling their imageComplete method. Subclasses may use this method as a convenience.
/** * Broadcasts the completion of an image read to all registered * <code>IIOReadProgressListener</code>s by calling their * <code>imageComplete</code> method. Subclasses may use this * method as a convenience. */
protected void processImageComplete() { if (progressListeners == null) { return; } int numListeners = progressListeners.size(); for (int i = 0; i < numListeners; i++) { IIOReadProgressListener listener = (IIOReadProgressListener)progressListeners.get(i); listener.imageComplete(this); } }
Broadcasts the start of a thumbnail read to all registered IIOReadProgressListeners by calling their thumbnailStarted method. Subclasses may use this method as a convenience.
Params:
  • imageIndex – the index of the image associated with the thumbnail.
  • thumbnailIndex – the index of the thumbnail.
/** * Broadcasts the start of a thumbnail read to all registered * <code>IIOReadProgressListener</code>s by calling their * <code>thumbnailStarted</code> method. Subclasses may use this * method as a convenience. * * @param imageIndex the index of the image associated with the * thumbnail. * @param thumbnailIndex the index of the thumbnail. */
protected void processThumbnailStarted(int imageIndex, int thumbnailIndex) { if (progressListeners == null) { return; } int numListeners = progressListeners.size(); for (int i = 0; i < numListeners; i++) { IIOReadProgressListener listener = (IIOReadProgressListener)progressListeners.get(i); listener.thumbnailStarted(this, imageIndex, thumbnailIndex); } }
Broadcasts the current percentage of thumbnail completion to all registered IIOReadProgressListeners by calling their thumbnailProgress method. Subclasses may use this method as a convenience.
Params:
  • percentageDone – the current percentage of completion, as a float.
/** * Broadcasts the current percentage of thumbnail completion to * all registered <code>IIOReadProgressListener</code>s by calling * their <code>thumbnailProgress</code> method. Subclasses may * use this method as a convenience. * * @param percentageDone the current percentage of completion, * as a <code>float</code>. */
protected void processThumbnailProgress(float percentageDone) { if (progressListeners == null) { return; } int numListeners = progressListeners.size(); for (int i = 0; i < numListeners; i++) { IIOReadProgressListener listener = (IIOReadProgressListener)progressListeners.get(i); listener.thumbnailProgress(this, percentageDone); } }
Broadcasts the completion of a thumbnail read to all registered IIOReadProgressListeners by calling their thumbnailComplete method. Subclasses may use this method as a convenience.
/** * Broadcasts the completion of a thumbnail read to all registered * <code>IIOReadProgressListener</code>s by calling their * <code>thumbnailComplete</code> method. Subclasses may use this * method as a convenience. */
protected void processThumbnailComplete() { if (progressListeners == null) { return; } int numListeners = progressListeners.size(); for (int i = 0; i < numListeners; i++) { IIOReadProgressListener listener = (IIOReadProgressListener)progressListeners.get(i); listener.thumbnailComplete(this); } }
Broadcasts that the read has been aborted to all registered IIOReadProgressListeners by calling their readAborted method. Subclasses may use this method as a convenience.
/** * Broadcasts that the read has been aborted to all registered * <code>IIOReadProgressListener</code>s by calling their * <code>readAborted</code> method. Subclasses may use this * method as a convenience. */
protected void processReadAborted() { if (progressListeners == null) { return; } int numListeners = progressListeners.size(); for (int i = 0; i < numListeners; i++) { IIOReadProgressListener listener = (IIOReadProgressListener)progressListeners.get(i); listener.readAborted(this); } }
Broadcasts the beginning of a progressive pass to all registered IIOReadUpdateListeners by calling their passStarted method. Subclasses may use this method as a convenience.
Params:
  • theImage – the BufferedImage being updated.
  • pass – the index of the current pass, 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 upper-left pixel included in the pass.
  • minY – the X coordinate of the upper-left pixel included in the pass.
  • periodX – the horizontal separation between pixels.
  • periodY – the vertical separation between pixels.
  • bands – an array of ints indicating the set of affected bands of the destination.
/** * Broadcasts the beginning of a progressive pass to all * registered <code>IIOReadUpdateListener</code>s by calling their * <code>passStarted</code> method. Subclasses may use this * method as a convenience. * * @param theImage the <code>BufferedImage</code> being updated. * @param pass the index of the current pass, starting with 0. * @param minPass the index of the first pass that will be decoded. * @param maxPass the index of the last pass that will be decoded. * @param minX the X coordinate of the upper-left pixel included * in the pass. * @param minY the X coordinate of the upper-left pixel included * in the pass. * @param periodX the horizontal separation between pixels. * @param periodY the vertical separation between pixels. * @param bands an array of <code>int</code>s indicating the * set of affected bands of the destination. */
protected void processPassStarted(BufferedImage theImage, int pass, int minPass, int maxPass, int minX, int minY, int periodX, int periodY, int[] bands) { if (updateListeners == null) { return; } int numListeners = updateListeners.size(); for (int i = 0; i < numListeners; i++) { IIOReadUpdateListener listener = (IIOReadUpdateListener)updateListeners.get(i); listener.passStarted(this, theImage, pass, minPass, maxPass, minX, minY, periodX, periodY, bands); } }
Broadcasts the update of a set of samples to all registered IIOReadUpdateListeners by calling their imageUpdate method. Subclasses may use this method as a convenience.
Params:
  • theImage – the BufferedImage being updated.
  • minX – the X coordinate of the upper-left pixel included in the pass.
  • minY – the X coordinate of the upper-left pixel included in the pass.
  • width – the total width of the area being updated, including pixels being skipped if periodX > 1.
  • height – the total height of the area being updated, including pixels being skipped if periodY > 1.
  • periodX – the horizontal separation between pixels.
  • periodY – the vertical separation between pixels.
  • bands – an array of ints indicating the set of affected bands of the destination.
/** * Broadcasts the update of a set of samples to all registered * <code>IIOReadUpdateListener</code>s by calling their * <code>imageUpdate</code> method. Subclasses may use this * method as a convenience. * * @param theImage the <code>BufferedImage</code> being updated. * @param minX the X coordinate of the upper-left pixel included * in the pass. * @param minY the X coordinate of the upper-left pixel included * in the pass. * @param width the total width of the area being updated, including * pixels being skipped if <code>periodX &gt; 1</code>. * @param height the total height of the area being updated, * including pixels being skipped if <code>periodY &gt; 1</code>. * @param periodX the horizontal separation between pixels. * @param periodY the vertical separation between pixels. * @param bands an array of <code>int</code>s indicating the * set of affected bands of the destination. */
protected void processImageUpdate(BufferedImage theImage, int minX, int minY, int width, int height, int periodX, int periodY, int[] bands) { if (updateListeners == null) { return; } int numListeners = updateListeners.size(); for (int i = 0; i < numListeners; i++) { IIOReadUpdateListener listener = (IIOReadUpdateListener)updateListeners.get(i); listener.imageUpdate(this, theImage, minX, minY, width, height, periodX, periodY, bands); } }
Broadcasts the end of a progressive pass to all registered IIOReadUpdateListeners by calling their passComplete method. Subclasses may use this method as a convenience.
Params:
  • theImage – the BufferedImage being updated.
/** * Broadcasts the end of a progressive pass to all * registered <code>IIOReadUpdateListener</code>s by calling their * <code>passComplete</code> method. Subclasses may use this * method as a convenience. * * @param theImage the <code>BufferedImage</code> being updated. */
protected void processPassComplete(BufferedImage theImage) { if (updateListeners == null) { return; } int numListeners = updateListeners.size(); for (int i = 0; i < numListeners; i++) { IIOReadUpdateListener listener = (IIOReadUpdateListener)updateListeners.get(i); listener.passComplete(this, theImage); } }
Broadcasts the beginning of a thumbnail progressive pass to all registered IIOReadUpdateListeners by calling their thumbnailPassStarted method. Subclasses may use this method as a convenience.
Params:
  • theThumbnail – the BufferedImage thumbnail being updated.
  • pass – the index of the current pass, 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 upper-left pixel included in the pass.
  • minY – the X coordinate of the upper-left pixel included in the pass.
  • periodX – the horizontal separation between pixels.
  • periodY – the vertical separation between pixels.
  • bands – an array of ints indicating the set of affected bands of the destination.
/** * Broadcasts the beginning of a thumbnail progressive pass to all * registered <code>IIOReadUpdateListener</code>s by calling their * <code>thumbnailPassStarted</code> method. Subclasses may use this * method as a convenience. * * @param theThumbnail the <code>BufferedImage</code> thumbnail * being updated. * @param pass the index of the current pass, starting with 0. * @param minPass the index of the first pass that will be decoded. * @param maxPass the index of the last pass that will be decoded. * @param minX the X coordinate of the upper-left pixel included * in the pass. * @param minY the X coordinate of the upper-left pixel included * in the pass. * @param periodX the horizontal separation between pixels. * @param periodY the vertical separation between pixels. * @param bands an array of <code>int</code>s indicating the * set of affected bands of the destination. */
protected void processThumbnailPassStarted(BufferedImage theThumbnail, int pass, int minPass, int maxPass, int minX, int minY, int periodX, int periodY, int[] bands) { if (updateListeners == null) { return; } int numListeners = updateListeners.size(); for (int i = 0; i < numListeners; i++) { IIOReadUpdateListener listener = (IIOReadUpdateListener)updateListeners.get(i); listener.thumbnailPassStarted(this, theThumbnail, pass, minPass, maxPass, minX, minY, periodX, periodY, bands); } }
Broadcasts the update of a set of samples in a thumbnail image to all registered IIOReadUpdateListeners by calling their thumbnailUpdate method. Subclasses may use this method as a convenience.
Params:
  • theThumbnail – the BufferedImage thumbnail being updated.
  • minX – the X coordinate of the upper-left pixel included in the pass.
  • minY – the X coordinate of the upper-left pixel included in the pass.
  • width – the total width of the area being updated, including pixels being skipped if periodX > 1.
  • height – the total height of the area being updated, including pixels being skipped if periodY > 1.
  • periodX – the horizontal separation between pixels.
  • periodY – the vertical separation between pixels.
  • bands – an array of ints indicating the set of affected bands of the destination.
/** * Broadcasts the update of a set of samples in a thumbnail image * to all registered <code>IIOReadUpdateListener</code>s by * calling their <code>thumbnailUpdate</code> method. Subclasses may * use this method as a convenience. * * @param theThumbnail the <code>BufferedImage</code> thumbnail * being updated. * @param minX the X coordinate of the upper-left pixel included * in the pass. * @param minY the X coordinate of the upper-left pixel included * in the pass. * @param width the total width of the area being updated, including * pixels being skipped if <code>periodX &gt; 1</code>. * @param height the total height of the area being updated, * including pixels being skipped if <code>periodY &gt; 1</code>. * @param periodX the horizontal separation between pixels. * @param periodY the vertical separation between pixels. * @param bands an array of <code>int</code>s indicating the * set of affected bands of the destination. */
protected void processThumbnailUpdate(BufferedImage theThumbnail, int minX, int minY, int width, int height, int periodX, int periodY, int[] bands) { if (updateListeners == null) { return; } int numListeners = updateListeners.size(); for (int i = 0; i < numListeners; i++) { IIOReadUpdateListener listener = (IIOReadUpdateListener)updateListeners.get(i); listener.thumbnailUpdate(this, theThumbnail, minX, minY, width, height, periodX, periodY, bands); } }
Broadcasts the end of a thumbnail progressive pass to all registered IIOReadUpdateListeners by calling their thumbnailPassComplete method. Subclasses may use this method as a convenience.
Params:
  • theThumbnail – the BufferedImage thumbnail being updated.
/** * Broadcasts the end of a thumbnail progressive pass to all * registered <code>IIOReadUpdateListener</code>s by calling their * <code>thumbnailPassComplete</code> method. Subclasses may use this * method as a convenience. * * @param theThumbnail the <code>BufferedImage</code> thumbnail * being updated. */
protected void processThumbnailPassComplete(BufferedImage theThumbnail) { if (updateListeners == null) { return; } int numListeners = updateListeners.size(); for (int i = 0; i < numListeners; i++) { IIOReadUpdateListener listener = (IIOReadUpdateListener)updateListeners.get(i); listener.thumbnailPassComplete(this, theThumbnail); } }
Broadcasts a warning message to all registered IIOReadWarningListeners by calling their warningOccurred method. Subclasses may use this method as a convenience.
Params:
  • warning – the warning message to send.
Throws:
/** * Broadcasts a warning message to all registered * <code>IIOReadWarningListener</code>s by calling their * <code>warningOccurred</code> method. Subclasses may use this * method as a convenience. * * @param warning the warning message to send. * * @exception IllegalArgumentException if <code>warning</code> * is <code>null</code>. */
protected void processWarningOccurred(String warning) { if (warningListeners == null) { return; } if (warning == null) { throw new IllegalArgumentException("warning == null!"); } int numListeners = warningListeners.size(); for (int i = 0; i < numListeners; i++) { IIOReadWarningListener listener = (IIOReadWarningListener)warningListeners.get(i); listener.warningOccurred(this, warning); } }
Broadcasts a localized warning message to all registered IIOReadWarningListeners by calling their warningOccurred method with a string taken from a ResourceBundle. Subclasses may use this method as a convenience.
Params:
  • baseName – the base name of a set of ResourceBundles containing localized warning messages.
  • keyword – the keyword used to index the warning message within the set of ResourceBundles.
Throws:
/** * Broadcasts a localized warning message to all registered * <code>IIOReadWarningListener</code>s by calling their * <code>warningOccurred</code> method with a string taken * from a <code>ResourceBundle</code>. Subclasses may use this * method as a convenience. * * @param baseName the base name of a set of * <code>ResourceBundle</code>s containing localized warning * messages. * @param keyword the keyword used to index the warning message * within the set of <code>ResourceBundle</code>s. * * @exception IllegalArgumentException if <code>baseName</code> * is <code>null</code>. * @exception IllegalArgumentException if <code>keyword</code> * is <code>null</code>. * @exception IllegalArgumentException if no appropriate * <code>ResourceBundle</code> may be located. * @exception IllegalArgumentException if the named resource is * not found in the located <code>ResourceBundle</code>. * @exception IllegalArgumentException if the object retrieved * from the <code>ResourceBundle</code> is not a * <code>String</code>. */
protected void processWarningOccurred(String baseName, String keyword) { if (warningListeners == null) { return; } if (baseName == null) { throw new IllegalArgumentException("baseName == null!"); } if (keyword == null) { throw new IllegalArgumentException("keyword == null!"); } int numListeners = warningListeners.size(); for (int i = 0; i < numListeners; i++) { IIOReadWarningListener listener = (IIOReadWarningListener)warningListeners.get(i); Locale locale = (Locale)warningLocales.get(i); if (locale == null) { locale = Locale.getDefault(); } /** * If an applet supplies an implementation of ImageReader and * resource bundles, then the resource bundle will need to be * accessed via the applet class loader. So first try the context * class loader to locate the resource bundle. * If that throws MissingResourceException, then try the * system class loader. */ ClassLoader loader = (ClassLoader) java.security.AccessController.doPrivileged( new java.security.PrivilegedAction() { public Object run() { return Thread.currentThread().getContextClassLoader(); } }); ResourceBundle bundle = null; try { bundle = ResourceBundle.getBundle(baseName, locale, loader); } catch (MissingResourceException mre) { try { bundle = ResourceBundle.getBundle(baseName, locale); } catch (MissingResourceException mre1) { throw new IllegalArgumentException("Bundle not found!"); } } String warning = null; try { warning = bundle.getString(keyword); } catch (ClassCastException cce) { throw new IllegalArgumentException("Resource is not a String!"); } catch (MissingResourceException mre) { throw new IllegalArgumentException("Resource is missing!"); } listener.warningOccurred(this, warning); } } // State management
Restores the ImageReader to its initial state.

The default implementation calls setInput(null, false), setLocale(null), removeAllIIOReadUpdateListeners(), removeAllIIOReadWarningListeners(), removeAllIIOReadProgressListeners(), and clearAbortRequest.

/** * Restores the <code>ImageReader</code> to its initial state. * * <p> The default implementation calls <code>setInput(null, * false)</code>, <code>setLocale(null)</code>, * <code>removeAllIIOReadUpdateListeners()</code>, * <code>removeAllIIOReadWarningListeners()</code>, * <code>removeAllIIOReadProgressListeners()</code>, and * <code>clearAbortRequest</code>. */
public void reset() { setInput(null, false, false); setLocale(null); removeAllIIOReadUpdateListeners(); removeAllIIOReadProgressListeners(); removeAllIIOReadWarningListeners(); clearAbortRequest(); }
Allows any resources held by this object to be released. The result of calling any other method (other than finalize) subsequent to a call to this method is undefined.

It is important for applications to call this method when they know they will no longer be using this ImageReader. Otherwise, the reader may continue to hold on to resources indefinitely.

The default implementation of this method in the superclass does nothing. Subclass implementations should ensure that all resources, especially native resources, are released.

/** * Allows any resources held by this object to be released. The * result of calling any other method (other than * <code>finalize</code>) subsequent to a call to this method * is undefined. * * <p>It is important for applications to call this method when they * know they will no longer be using this <code>ImageReader</code>. * Otherwise, the reader may continue to hold on to resources * indefinitely. * * <p>The default implementation of this method in the superclass does * nothing. Subclass implementations should ensure that all resources, * especially native resources, are released. */
public void dispose() { } // Utility methods
A utility method that may be used by readers to compute the region of the source image that should be read, taking into account any source region and subsampling offset settings in the supplied ImageReadParam. The actual subsampling factors, destination size, and destination offset are not taken into consideration, thus further clipping must take place. The computeRegions method performs all necessary clipping.
Params:
  • param – the ImageReadParam being used, or null.
  • srcWidth – the width of the source image.
  • srcHeight – the height of the source image.
Returns:the source region as a Rectangle.
/** * A utility method that may be used by readers to compute the * region of the source image that should be read, taking into * account any source region and subsampling offset settings in * the supplied <code>ImageReadParam</code>. The actual * subsampling factors, destination size, and destination offset * are <em>not</em> taken into consideration, thus further * clipping must take place. The {@link #computeRegions * <code>computeRegions</code>} method performs all necessary * clipping. * * @param param the <code>ImageReadParam</code> being used, or * <code>null</code>. * @param srcWidth the width of the source image. * @param srcHeight the height of the source image. * * @return the source region as a <code>Rectangle</code>. */
protected static Rectangle getSourceRegion(ImageReadParam param, int srcWidth, int srcHeight) { Rectangle sourceRegion = new Rectangle(0, 0, srcWidth, srcHeight); if (param != null) { Rectangle region = param.getSourceRegion(); if (region != null) { sourceRegion = sourceRegion.intersection(region); } int subsampleXOffset = param.getSubsamplingXOffset(); int subsampleYOffset = param.getSubsamplingYOffset(); sourceRegion.x += subsampleXOffset; sourceRegion.y += subsampleYOffset; sourceRegion.width -= subsampleXOffset; sourceRegion.height -= subsampleYOffset; } return sourceRegion; }
Computes the source region of interest and the destination region of interest, taking the width and height of the source image, an optional destination image, and an optional ImageReadParam into account. The source region begins with the entire source image. Then that is clipped to the source region specified in the ImageReadParam, if one is specified.

If either of the destination offsets are negative, the source region is clipped so that its top left will coincide with the top left of the destination image, taking subsampling into account. Then the result is clipped to the destination image on the right and bottom, if one is specified, taking subsampling and destination offsets into account.

Similarly, the destination region begins with the source image, is translated to the destination offset given in the ImageReadParam if there is one, and finally is clipped to the destination image, if there is one.

If either the source or destination regions end up having a width or height of 0, an IllegalArgumentException is thrown.

The getSourceRegion method may be used if only source clipping is desired.

Params:
  • param – an ImageReadParam, or null.
  • srcWidth – the width of the source image.
  • srcHeight – the height of the source image.
  • image – a BufferedImage that will be the destination image, or null.
  • srcRegion – a Rectangle that will be filled with the source region of interest.
  • destRegion – a Rectangle that will be filled with the destination region of interest.
Throws:
/** * Computes the source region of interest and the destination * region of interest, taking the width and height of the source * image, an optional destination image, and an optional * <code>ImageReadParam</code> into account. The source region * begins with the entire source image. Then that is clipped to * the source region specified in the <code>ImageReadParam</code>, * if one is specified. * * <p> If either of the destination offsets are negative, the * source region is clipped so that its top left will coincide * with the top left of the destination image, taking subsampling * into account. Then the result is clipped to the destination * image on the right and bottom, if one is specified, taking * subsampling and destination offsets into account. * * <p> Similarly, the destination region begins with the source * image, is translated to the destination offset given in the * <code>ImageReadParam</code> if there is one, and finally is * clipped to the destination image, if there is one. * * <p> If either the source or destination regions end up having a * width or height of 0, an <code>IllegalArgumentException</code> * is thrown. * * <p> The {@link #getSourceRegion <code>getSourceRegion</code>} * method may be used if only source clipping is desired. * * @param param an <code>ImageReadParam</code>, or <code>null</code>. * @param srcWidth the width of the source image. * @param srcHeight the height of the source image. * @param image a <code>BufferedImage</code> that will be the * destination image, or <code>null</code>. * @param srcRegion a <code>Rectangle</code> that will be filled with * the source region of interest. * @param destRegion a <code>Rectangle</code> that will be filled with * the destination region of interest. * @exception IllegalArgumentException if <code>srcRegion</code> * is <code>null</code>. * @exception IllegalArgumentException if <code>dstRegion</code> * is <code>null</code>. * @exception IllegalArgumentException if the resulting source or * destination region is empty. */
protected static void computeRegions(ImageReadParam param, int srcWidth, int srcHeight, BufferedImage image, Rectangle srcRegion, Rectangle destRegion) { if (srcRegion == null) { throw new IllegalArgumentException("srcRegion == null!"); } if (destRegion == null) { throw new IllegalArgumentException("destRegion == null!"); } // Start with the entire source image srcRegion.setBounds(0, 0, srcWidth, srcHeight); // Destination also starts with source image, as that is the // maximum extent if there is no subsampling destRegion.setBounds(0, 0, srcWidth, srcHeight); // Clip that to the param region, if there is one int periodX = 1; int periodY = 1; int gridX = 0; int gridY = 0; if (param != null) { Rectangle paramSrcRegion = param.getSourceRegion(); if (paramSrcRegion != null) { srcRegion.setBounds(srcRegion.intersection(paramSrcRegion)); } periodX = param.getSourceXSubsampling(); periodY = param.getSourceYSubsampling(); gridX = param.getSubsamplingXOffset(); gridY = param.getSubsamplingYOffset(); srcRegion.translate(gridX, gridY); srcRegion.width -= gridX; srcRegion.height -= gridY; destRegion.setLocation(param.getDestinationOffset()); } // Now clip any negative destination offsets, i.e. clip // to the top and left of the destination image if (destRegion.x < 0) { int delta = -destRegion.x*periodX; srcRegion.x += delta; srcRegion.width -= delta; destRegion.x = 0; } if (destRegion.y < 0) { int delta = -destRegion.y*periodY; srcRegion.y += delta; srcRegion.height -= delta; destRegion.y = 0; } // Now clip the destination Region to the subsampled width and height int subsampledWidth = (srcRegion.width + periodX - 1)/periodX; int subsampledHeight = (srcRegion.height + periodY - 1)/periodY; destRegion.width = subsampledWidth; destRegion.height = subsampledHeight; // Now clip that to right and bottom of the destination image, // if there is one, taking subsampling into account if (image != null) { Rectangle destImageRect = new Rectangle(0, 0, image.getWidth(), image.getHeight()); destRegion.setBounds(destRegion.intersection(destImageRect)); if (destRegion.isEmpty()) { throw new IllegalArgumentException ("Empty destination region!"); } int deltaX = destRegion.x + subsampledWidth - image.getWidth(); if (deltaX > 0) { srcRegion.width -= deltaX*periodX; } int deltaY = destRegion.y + subsampledHeight - image.getHeight(); if (deltaY > 0) { srcRegion.height -= deltaY*periodY; } } if (srcRegion.isEmpty() || destRegion.isEmpty()) { throw new IllegalArgumentException("Empty region!"); } }
A utility method that may be used by readers to test the validity of the source and destination band settings of an ImageReadParam. This method may be called as soon as the reader knows both the number of bands of the source image as it exists in the input stream, and the number of bands of the destination image that being written.

The method retrieves the source and destination band setting arrays from param using the getSourceBands and getDestinationBandsmethods (or considers them to be null if param is null). If the source band setting array is null, it is considered to be equal to the array { 0, 1, ..., numSrcBands - 1 }, and similarly for the destination band setting array.

The method then tests that both arrays are equal in length, and that neither array contains a value larger than the largest available band index.

Any failure results in an IllegalArgumentException being thrown; success results in the method returning silently.

Params:
  • param – the ImageReadParam being used to read the image.
  • numSrcBands – the number of bands of the image as it exists int the input source.
  • numDstBands – the number of bands in the destination image being written.
Throws:
/** * A utility method that may be used by readers to test the * validity of the source and destination band settings of an * <code>ImageReadParam</code>. This method may be called as soon * as the reader knows both the number of bands of the source * image as it exists in the input stream, and the number of bands * of the destination image that being written. * * <p> The method retrieves the source and destination band * setting arrays from param using the <code>getSourceBands</code> * and <code>getDestinationBands</code>methods (or considers them * to be <code>null</code> if <code>param</code> is * <code>null</code>). If the source band setting array is * <code>null</code>, it is considered to be equal to the array * <code>{ 0, 1, ..., numSrcBands - 1 }</code>, and similarly for * the destination band setting array. * * <p> The method then tests that both arrays are equal in length, * and that neither array contains a value larger than the largest * available band index. * * <p> Any failure results in an * <code>IllegalArgumentException</code> being thrown; success * results in the method returning silently. * * @param param the <code>ImageReadParam</code> being used to read * the image. * @param numSrcBands the number of bands of the image as it exists * int the input source. * @param numDstBands the number of bands in the destination image * being written. * * @exception IllegalArgumentException if <code>param</code> * contains an invalid specification of a source and/or * destination band subset. */
protected static void checkReadParamBandSettings(ImageReadParam param, int numSrcBands, int numDstBands) { // A null param is equivalent to srcBands == dstBands == null. int[] srcBands = null; int[] dstBands = null; if (param != null) { srcBands = param.getSourceBands(); dstBands = param.getDestinationBands(); } int paramSrcBandLength = (srcBands == null) ? numSrcBands : srcBands.length; int paramDstBandLength = (dstBands == null) ? numDstBands : dstBands.length; if (paramSrcBandLength != paramDstBandLength) { throw new IllegalArgumentException("ImageReadParam num source & dest bands differ!"); } if (srcBands != null) { for (int i = 0; i < srcBands.length; i++) { if (srcBands[i] >= numSrcBands) { throw new IllegalArgumentException("ImageReadParam source bands contains a value >= the number of source bands!"); } } } if (dstBands != null) { for (int i = 0; i < dstBands.length; i++) { if (dstBands[i] >= numDstBands) { throw new IllegalArgumentException("ImageReadParam dest bands contains a value >= the number of dest bands!"); } } } }
Returns the BufferedImage to which decoded pixel data should be written. The image is determined by inspecting the supplied ImageReadParam if it is non-null; if its getDestination method returns a non-null value, that image is simply returned. Otherwise, param.getDestinationType method is called to determine if a particular image type has been specified. If so, the returned ImageTypeSpecifier is used after checking that it is equal to one of those included in imageTypes.

If param is null or the above steps have not yielded an image or an ImageTypeSpecifier, the first value obtained from the imageTypes parameter is used. Typically, the caller will set imageTypes to the value of getImageTypes(imageIndex).

Next, the dimensions of the image are determined by a call to computeRegions. The actual width and height of the image being decoded are passed in as the width and height parameters.

Params:
  • param – an ImageReadParam to be used to get the destination image or image type, or null.
  • imageTypes – an Iterator of ImageTypeSpecifiers indicating the legal image types, with the default first.
  • width – the true width of the image or tile begin decoded.
  • height – the true width of the image or tile being decoded.
Throws:
  • IIOException – if the ImageTypeSpecifier specified by param does not match any of the legal ones from imageTypes.
  • IllegalArgumentException – if imageTypes is null or empty, or if an object not of type ImageTypeSpecifier is retrieved from it.
  • IllegalArgumentException – if the resulting image would have a width or height less than 1.
  • IllegalArgumentException – if the product of width and height is greater than Integer.MAX_VALUE.
Returns:the BufferedImage to which decoded pixel data should be written.
/** * Returns the <code>BufferedImage</code> to which decoded pixel * data should be written. The image is determined by inspecting * the supplied <code>ImageReadParam</code> if it is * non-<code>null</code>; if its <code>getDestination</code> * method returns a non-<code>null</code> value, that image is * simply returned. Otherwise, * <code>param.getDestinationType</code> method is called to * determine if a particular image type has been specified. If * so, the returned <code>ImageTypeSpecifier</code> is used after * checking that it is equal to one of those included in * <code>imageTypes</code>. * * <p> If <code>param</code> is <code>null</code> or the above * steps have not yielded an image or an * <code>ImageTypeSpecifier</code>, the first value obtained from * the <code>imageTypes</code> parameter is used. Typically, the * caller will set <code>imageTypes</code> to the value of * <code>getImageTypes(imageIndex)</code>. * * <p> Next, the dimensions of the image are determined by a call * to <code>computeRegions</code>. The actual width and height of * the image being decoded are passed in as the <code>width</code> * and <code>height</code> parameters. * * @param param an <code>ImageReadParam</code> to be used to get * the destination image or image type, or <code>null</code>. * @param imageTypes an <code>Iterator</code> of * <code>ImageTypeSpecifier</code>s indicating the legal image * types, with the default first. * @param width the true width of the image or tile begin decoded. * @param height the true width of the image or tile being decoded. * * @return the <code>BufferedImage</code> to which decoded pixel * data should be written. * * @exception IIOException if the <code>ImageTypeSpecifier</code> * specified by <code>param</code> does not match any of the legal * ones from <code>imageTypes</code>. * @exception IllegalArgumentException if <code>imageTypes</code> * is <code>null</code> or empty, or if an object not of type * <code>ImageTypeSpecifier</code> is retrieved from it. * @exception IllegalArgumentException if the resulting image would * have a width or height less than 1. * @exception IllegalArgumentException if the product of * <code>width</code> and <code>height</code> is greater than * <code>Integer.MAX_VALUE</code>. */
protected static BufferedImage getDestination(ImageReadParam param, Iterator<ImageTypeSpecifier> imageTypes, int width, int height) throws IIOException { if (imageTypes == null || !imageTypes.hasNext()) { throw new IllegalArgumentException("imageTypes null or empty!"); } if ((long)width*height > Integer.MAX_VALUE) { throw new IllegalArgumentException ("width*height > Integer.MAX_VALUE!"); } BufferedImage dest = null; ImageTypeSpecifier imageType = null; // If param is non-null, use it if (param != null) { // Try to get the image itself dest = param.getDestination(); if (dest != null) { return dest; } // No image, get the image type imageType = param.getDestinationType(); } // No info from param, use fallback image type if (imageType == null) { Object o = imageTypes.next(); if (!(o instanceof ImageTypeSpecifier)) { throw new IllegalArgumentException ("Non-ImageTypeSpecifier retrieved from imageTypes!"); } imageType = (ImageTypeSpecifier)o; } else { boolean foundIt = false; while (imageTypes.hasNext()) { ImageTypeSpecifier type = (ImageTypeSpecifier)imageTypes.next(); if (type.equals(imageType)) { foundIt = true; break; } } if (!foundIt) { throw new IIOException ("Destination type from ImageReadParam does not match!"); } } Rectangle srcRegion = new Rectangle(0,0,0,0); Rectangle destRegion = new Rectangle(0,0,0,0); computeRegions(param, width, height, null, srcRegion, destRegion); int destWidth = destRegion.x + destRegion.width; int destHeight = destRegion.y + destRegion.height; // Create a new image based on the type specifier return imageType.createBufferedImage(destWidth, destHeight); } }