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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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package javax.imageio;

import java.awt.Dimension;
import java.util.Locale;


A class describing how a stream is to be encoded. Instances of this class or its subclasses are used to supply prescriptive "how-to" information to instances of ImageWriter. 
 A plug-in for a specific image format may define a subclass of this class, and return objects of that class from the getDefaultWriteParam method of its ImageWriter implementation. For example, the built-in JPEG writer plug-in will return instances of javax.imageio.plugins.jpeg.JPEGImageWriteParam. 
 The region of the image to be written is determined by first intersecting the actual bounds of the image with the rectangle specified by IIOParam.setSourceRegion, if any. If the resulting rectangle has a width or height of zero, the writer will throw an IIOException. If the intersection is non-empty, writing will commence with the first subsampled pixel and include additional pixels within the intersected bounds according to the horizontal and vertical subsampling factors specified by 
IIOParam.setSourceSubsampling. 
 Individual features such as tiling, progressive encoding, and compression may be set in one of four modes. MODE_DISABLED disables the features; MODE_DEFAULT enables the feature with writer-controlled parameter values; MODE_EXPLICIT enables the feature and allows the use of a set method to provide additional parameters; and MODE_COPY_FROM_METADATA copies relevant parameter values from the stream and image metadata objects passed to the writer. The default for all features is MODE_COPY_FROM_METADATA. Non-standard features supplied in subclasses are encouraged, but not required to use a similar scheme. 
 Plug-in writers may extend the functionality of ImageWriteParam by providing a subclass that implements additional, plug-in specific interfaces. It is up to the plug-in to document what interfaces are available and how they are to be used. Writers will silently ignore any extended features of an ImageWriteParam subclass of which they are not aware. Also, they may ignore any optional features that they normally disable when creating their own ImageWriteParam instances via getDefaultWriteParam. 
 Note that unless a query method exists for a capability, it must be supported by all ImageWriter implementations (e.g. progressive encoding is optional, but subsampling must be
supported).

See Also:
/**
 * A class describing how a stream is to be encoded.  Instances of
 * this class or its subclasses are used to supply prescriptive
 * "how-to" information to instances of {@code ImageWriter}.
 *
 * <p> A plug-in for a specific image format may define a subclass of
 * this class, and return objects of that class from the
 * {@code getDefaultWriteParam} method of its
 * {@code ImageWriter} implementation.  For example, the built-in
 * JPEG writer plug-in will return instances of
 * {@code javax.imageio.plugins.jpeg.JPEGImageWriteParam}.
 *
 * <p> The region of the image to be written is determined by first
 * intersecting the actual bounds of the image with the rectangle
 * specified by {@code IIOParam.setSourceRegion}, if any.  If the
 * resulting rectangle has a width or height of zero, the writer will
 * throw an {@code IIOException}. If the intersection is
 * non-empty, writing will commence with the first subsampled pixel
 * and include additional pixels within the intersected bounds
 * according to the horizontal and vertical subsampling factors
 * specified by {@link IIOParam#setSourceSubsampling
 * IIOParam.setSourceSubsampling}.
 *
 * <p> Individual features such as tiling, progressive encoding, and
 * compression may be set in one of four modes.
 * {@code MODE_DISABLED} disables the features;
 * {@code MODE_DEFAULT} enables the feature with
 * writer-controlled parameter values; {@code MODE_EXPLICIT}
 * enables the feature and allows the use of a {@code set} method
 * to provide additional parameters; and
 * {@code MODE_COPY_FROM_METADATA} copies relevant parameter
 * values from the stream and image metadata objects passed to the
 * writer.  The default for all features is
 * {@code MODE_COPY_FROM_METADATA}.  Non-standard features
 * supplied in subclasses are encouraged, but not required to use a
 * similar scheme.
 *
 * <p> Plug-in writers may extend the functionality of
 * {@code ImageWriteParam} by providing a subclass that implements
 * additional, plug-in specific interfaces.  It is up to the plug-in
 * to document what interfaces are available and how they are to be
 * used.  Writers will silently ignore any extended features of an
 * {@code ImageWriteParam} subclass of which they are not aware.
 * Also, they may ignore any optional features that they normally
 * disable when creating their own {@code ImageWriteParam}
 * instances via {@code getDefaultWriteParam}.
 *
 * <p> Note that unless a query method exists for a capability, it must
 * be supported by all {@code ImageWriter} implementations
 * (<i>e.g.</i> progressive encoding is optional, but subsampling must be
 * supported).
 *
 *
 * @see ImageReadParam
 */
public class ImageWriteParam extends IIOParam {

    
A constant value that may be passed into methods such as setTilingMode, setProgressiveMode, and setCompressionMode to disable a feature for future writes. That is, when this mode is set the stream will not be tiled, progressive, or compressed, and the relevant accessor methods will throw an IllegalStateException. 
See Also:
/**
     * A constant value that may be passed into methods such as
     * {@code setTilingMode}, {@code setProgressiveMode},
     * and {@code setCompressionMode} to disable a feature for
     * future writes.  That is, when this mode is set the stream will
     * <b>not</b> be tiled, progressive, or compressed, and the
     * relevant accessor methods will throw an
     * {@code IllegalStateException}.
     *
     * @see #MODE_EXPLICIT
     * @see #MODE_COPY_FROM_METADATA
     * @see #MODE_DEFAULT
     * @see #setProgressiveMode
     * @see #getProgressiveMode
     * @see #setTilingMode
     * @see #getTilingMode
     * @see #setCompressionMode
     * @see #getCompressionMode
     */
    public static final int MODE_DISABLED = 0;

    
A constant value that may be passed into methods such as setTilingMode, setProgressiveMode, and setCompressionMode to enable that feature for future writes. That is, when this mode is enabled the stream will be tiled, progressive, or compressed according to a sensible default chosen internally by the writer in a plug-in dependent way, and the relevant accessor methods will throw an IllegalStateException. 
See Also:
/**
     * A constant value that may be passed into methods such as
     * {@code setTilingMode},
     * {@code setProgressiveMode}, and
     * {@code setCompressionMode} to enable that feature for
     * future writes.  That is, when this mode is enabled the stream
     * will be tiled, progressive, or compressed according to a
     * sensible default chosen internally by the writer in a plug-in
     * dependent way, and the relevant accessor methods will
     * throw an {@code IllegalStateException}.
     *
     * @see #MODE_DISABLED
     * @see #MODE_EXPLICIT
     * @see #MODE_COPY_FROM_METADATA
     * @see #setProgressiveMode
     * @see #getProgressiveMode
     * @see #setTilingMode
     * @see #getTilingMode
     * @see #setCompressionMode
     * @see #getCompressionMode
     */
    public static final int MODE_DEFAULT = 1;

    
A constant value that may be passed into methods such as setTilingMode or setCompressionMode to enable a feature for future writes. That is, when this mode is set the stream will be tiled or compressed according to additional information supplied to the corresponding set methods in this class and retrievable from the corresponding get methods. Note that this mode is not supported for progressive output. 
See Also:
/**
     * A constant value that may be passed into methods such as
     * {@code setTilingMode} or {@code setCompressionMode}
     * to enable a feature for future writes. That is, when this mode
     * is set the stream will be tiled or compressed according to
     * additional information supplied to the corresponding
     * {@code set} methods in this class and retrievable from the
     * corresponding {@code get} methods.  Note that this mode is
     * not supported for progressive output.
     *
     * @see #MODE_DISABLED
     * @see #MODE_COPY_FROM_METADATA
     * @see #MODE_DEFAULT
     * @see #setProgressiveMode
     * @see #getProgressiveMode
     * @see #setTilingMode
     * @see #getTilingMode
     * @see #setCompressionMode
     * @see #getCompressionMode
     */
    public static final int MODE_EXPLICIT = 2;

    
A constant value that may be passed into methods such as setTilingMode, setProgressiveMode, or setCompressionMode to enable that feature for future writes. That is, when this mode is enabled the stream will be tiled, progressive, or compressed based on the contents of stream and/or image metadata passed into the write operation, and any relevant accessor methods will throw an IllegalStateException. 
 This is the default mode for all features, so that a read
including metadata followed by a write including metadata will
preserve as much information as possible.

See Also:
/**
     * A constant value that may be passed into methods such as
     * {@code setTilingMode}, {@code setProgressiveMode}, or
     * {@code setCompressionMode} to enable that feature for
     * future writes.  That is, when this mode is enabled the stream
     * will be tiled, progressive, or compressed based on the contents
     * of stream and/or image metadata passed into the write
     * operation, and any relevant accessor methods will throw an
     * {@code IllegalStateException}.
     *
     * <p> This is the default mode for all features, so that a read
     * including metadata followed by a write including metadata will
     * preserve as much information as possible.
     *
     * @see #MODE_DISABLED
     * @see #MODE_EXPLICIT
     * @see #MODE_DEFAULT
     * @see #setProgressiveMode
     * @see #getProgressiveMode
     * @see #setTilingMode
     * @see #getTilingMode
     * @see #setCompressionMode
     * @see #getCompressionMode
     */
    public static final int MODE_COPY_FROM_METADATA = 3;

    // If more modes are added, this should be updated.
    private static final int MAX_MODE = MODE_COPY_FROM_METADATA;

    
A boolean that is true if this ImageWriteParam allows tile width and tile height parameters to be set. By default, the value is false. Subclasses must set the value manually. 
 Subclasses that do not support writing tiles should ensure that this value is set to false. 
/**
     * A {@code boolean} that is {@code true} if this
     * {@code ImageWriteParam} allows tile width and tile height
     * parameters to be set.  By default, the value is
     * {@code false}.  Subclasses must set the value manually.
     *
     * <p> Subclasses that do not support writing tiles should ensure
     * that this value is set to {@code false}.
     */
    protected boolean canWriteTiles = false;

    
The mode controlling tiling settings, which Must be set to one of the four MODE_* values. The default is MODE_COPY_FROM_METADATA. 
 Subclasses that do not writing tiles may ignore this value.

See Also:
/**
     * The mode controlling tiling settings, which Must be
     * set to one of the four {@code MODE_*} values.  The default
     * is {@code MODE_COPY_FROM_METADATA}.
     *
     * <p> Subclasses that do not writing tiles may ignore this value.
     *
     * @see #MODE_DISABLED
     * @see #MODE_EXPLICIT
     * @see #MODE_COPY_FROM_METADATA
     * @see #MODE_DEFAULT
     * @see #setTilingMode
     * @see #getTilingMode
     */
    protected int tilingMode = MODE_COPY_FROM_METADATA;

    
An array of preferred tile size range pairs. The default value is null, which indicates that there are no preferred sizes. If the value is non-null, it must have an even length of at least two. 
 Subclasses that do not support writing tiles may ignore
this value.

See Also:
/**
     * An array of preferred tile size range pairs.  The default value
     * is {@code null}, which indicates that there are no
     * preferred sizes.  If the value is non-{@code null}, it
     * must have an even length of at least two.
     *
     * <p> Subclasses that do not support writing tiles may ignore
     * this value.
     *
     * @see #getPreferredTileSizes
     */
    protected Dimension[] preferredTileSizes = null;

    
A boolean that is true if tiling parameters have been specified. 
 Subclasses that do not support writing tiles may ignore
this value.

/**
     * A {@code boolean} that is {@code true} if tiling
     * parameters have been specified.
     *
     * <p> Subclasses that do not support writing tiles may ignore
     * this value.
     */
    protected boolean tilingSet = false;

    
The width of each tile if tiling has been set, or 0 otherwise.

 Subclasses that do not support tiling may ignore this
value.

/**
     * The width of each tile if tiling has been set, or 0 otherwise.
     *
     * <p> Subclasses that do not support tiling may ignore this
     * value.
     */
    protected int tileWidth = 0;

    
The height of each tile if tiling has been set, or 0 otherwise. The initial value is 0. 
 Subclasses that do not support tiling may ignore this
value.

/**
     * The height of each tile if tiling has been set, or 0 otherwise.
     * The initial value is {@code 0}.
     *
     * <p> Subclasses that do not support tiling may ignore this
     * value.
     */
    protected int tileHeight = 0;

    
A boolean that is true if this ImageWriteParam allows tiling grid offset parameters to be set. By default, the value is false. Subclasses must set the value manually. 
 Subclasses that do not support writing tiles, or that support writing but not offsetting tiles must ensure that this value is set to false. 
/**
     * A {@code boolean} that is {@code true} if this
     * {@code ImageWriteParam} allows tiling grid offset
     * parameters to be set.  By default, the value is
     * {@code false}.  Subclasses must set the value manually.
     *
     * <p> Subclasses that do not support writing tiles, or that
     * support writing but not offsetting tiles must ensure that this
     * value is set to {@code false}.
     */
    protected boolean canOffsetTiles = false;

    
The amount by which the tile grid origin should be offset horizontally from the image origin if tiling has been set, or 0 otherwise. The initial value is 0. 
 Subclasses that do not support offsetting tiles may ignore
this value.

/**
     * The amount by which the tile grid origin should be offset
     * horizontally from the image origin if tiling has been set,
     * or 0 otherwise.  The initial value is {@code 0}.
     *
     * <p> Subclasses that do not support offsetting tiles may ignore
     * this value.
     */
    protected int tileGridXOffset = 0;

    
The amount by which the tile grid origin should be offset vertically from the image origin if tiling has been set, or 0 otherwise. The initial value is 0. 
 Subclasses that do not support offsetting tiles may ignore
this value.

/**
     * The amount by which the tile grid origin should be offset
     * vertically from the image origin if tiling has been set,
     * or 0 otherwise.  The initial value is {@code 0}.
     *
     * <p> Subclasses that do not support offsetting tiles may ignore
     * this value.
     */
    protected int tileGridYOffset = 0;

    
A boolean that is true if this ImageWriteParam allows images to be written as a progressive sequence of increasing quality passes. By default, the value is false. Subclasses must set the value manually. 
 Subclasses that do not support progressive encoding must ensure that this value is set to false. 
/**
     * A {@code boolean} that is {@code true} if this
     * {@code ImageWriteParam} allows images to be written as a
     * progressive sequence of increasing quality passes.  By default,
     * the value is {@code false}.  Subclasses must set the value
     * manually.
     *
     * <p> Subclasses that do not support progressive encoding must
     * ensure that this value is set to {@code false}.
     */
    protected boolean canWriteProgressive = false;

    
The mode controlling progressive encoding, which must be set to one of the four MODE_* values, except MODE_EXPLICIT. The default is MODE_COPY_FROM_METADATA. 
 Subclasses that do not support progressive encoding may
ignore this value.

See Also:
/**
     * The mode controlling progressive encoding, which must be set to
     * one of the four {@code MODE_*} values, except
     * {@code MODE_EXPLICIT}.  The default is
     * {@code MODE_COPY_FROM_METADATA}.
     *
     * <p> Subclasses that do not support progressive encoding may
     * ignore this value.
     *
     * @see #MODE_DISABLED
     * @see #MODE_EXPLICIT
     * @see #MODE_COPY_FROM_METADATA
     * @see #MODE_DEFAULT
     * @see #setProgressiveMode
     * @see #getProgressiveMode
     */
    protected int progressiveMode = MODE_COPY_FROM_METADATA;

    
A boolean that is true if this writer can write images using compression. By default, the value is false. Subclasses must set the value manually. 
 Subclasses that do not support compression must ensure that this value is set to false. 
/**
     * A {@code boolean} that is {@code true} if this writer
     * can write images using compression. By default, the value is
     * {@code false}.  Subclasses must set the value manually.
     *
     * <p> Subclasses that do not support compression must ensure that
     * this value is set to {@code false}.
     */
    protected boolean canWriteCompressed = false;

    
The mode controlling compression settings, which must be set to one of the four MODE_* values. The default is MODE_COPY_FROM_METADATA. 
 Subclasses that do not support compression may ignore this
value.

See Also:
/**
     * The mode controlling compression settings, which must be set to
     * one of the four {@code MODE_*} values.  The default is
     * {@code MODE_COPY_FROM_METADATA}.
     *
     * <p> Subclasses that do not support compression may ignore this
     * value.
     *
     * @see #MODE_DISABLED
     * @see #MODE_EXPLICIT
     * @see #MODE_COPY_FROM_METADATA
     * @see #MODE_DEFAULT
     * @see #setCompressionMode
     * @see #getCompressionMode
     */
    protected int compressionMode = MODE_COPY_FROM_METADATA;

    
An array of Strings containing the names of the available compression types. Subclasses must set the value manually. 
 Subclasses that do not support compression may ignore this
value.

/**
     * An array of {@code String}s containing the names of the
     * available compression types.  Subclasses must set the value
     * manually.
     *
     * <p> Subclasses that do not support compression may ignore this
     * value.
     */
    protected String[] compressionTypes = null;

    
A String containing the name of the current compression type, or null if none is set. 
 Subclasses that do not support compression may ignore this
value.

/**
     * A {@code String} containing the name of the current
     * compression type, or {@code null} if none is set.
     *
     * <p> Subclasses that do not support compression may ignore this
     * value.
     */
    protected String compressionType = null;

    
A float containing the current compression quality setting. The initial value is 1.0F. 
 Subclasses that do not support compression may ignore this
value.

/**
     * A {@code float} containing the current compression quality
     * setting.  The initial value is {@code 1.0F}.
     *
     * <p> Subclasses that do not support compression may ignore this
     * value.
     */
    protected float compressionQuality = 1.0F;

    
A Locale to be used to localize compression type names and quality descriptions, or null to use a default Locale. Subclasses must set the value manually. 
/**
     * A {@code Locale} to be used to localize compression type
     * names and quality descriptions, or {@code null} to use a
     * default {@code Locale}.  Subclasses must set the value
     * manually.
     */
    protected Locale locale = null;

    
Constructs an empty ImageWriteParam. It is up to the subclass to set up the instance variables properly. 
/**
     * Constructs an empty {@code ImageWriteParam}.  It is up to
     * the subclass to set up the instance variables properly.
     */
    protected ImageWriteParam() {}

    
Constructs an ImageWriteParam set to use a given Locale. 
Params:
  • locale – a Locale to be used to localize compression type names and quality descriptions, or null.
/**
     * Constructs an {@code ImageWriteParam} set to use a
     * given {@code Locale}.
     *
     * @param locale a {@code Locale} to be used to localize
     * compression type names and quality descriptions, or
     * {@code null}.
     */
    public ImageWriteParam(Locale locale) {
        this.locale = locale;
    }

    // Return a deep copy of the array
    private static Dimension[] clonePreferredTileSizes(Dimension[] sizes) {
        if (sizes == null) {
            return null;
        }
        Dimension[] temp = new Dimension[sizes.length];
        for (int i = 0; i < sizes.length; i++) {
            temp[i] = new Dimension(sizes[i]);
        }
        return temp;
    }

    
Returns the currently set Locale, or null if only a default Locale is supported. 
Returns:the current Locale, or null.
/**
     * Returns the currently set {@code Locale}, or
     * {@code null} if only a default {@code Locale} is
     * supported.
     *
     * @return the current {@code Locale}, or {@code null}.
     */
    public Locale getLocale() {
        return locale;
    }

    
Returns true if the writer can perform tiling while writing. If this method returns false, then setTiling will throw an UnsupportedOperationException. 
See Also:
Returns:true if the writer supports tiling.
/**
     * Returns {@code true} if the writer can perform tiling
     * while writing.  If this method returns {@code false}, then
     * {@code setTiling} will throw an
     * {@code UnsupportedOperationException}.
     *
     * @return {@code true} if the writer supports tiling.
     *
     * @see #canOffsetTiles()
     * @see #setTiling(int, int, int, int)
     */
    public boolean canWriteTiles() {
        return canWriteTiles;
    }

    
Returns true if the writer can perform tiling with non-zero grid offsets while writing. If this method returns false, then setTiling will throw an UnsupportedOperationException if the grid offset arguments are not both zero. If canWriteTiles returns false, this method will return false as well. 
See Also:
Returns:true if the writer supports non-zero tile offsets.
/**
     * Returns {@code true} if the writer can perform tiling with
     * non-zero grid offsets while writing.  If this method returns
     * {@code false}, then {@code setTiling} will throw an
     * {@code UnsupportedOperationException} if the grid offset
     * arguments are not both zero.  If {@code canWriteTiles}
     * returns {@code false}, this method will return
     * {@code false} as well.
     *
     * @return {@code true} if the writer supports non-zero tile
     * offsets.
     *
     * @see #canWriteTiles()
     * @see #setTiling(int, int, int, int)
     */
    public boolean canOffsetTiles() {
        return canOffsetTiles;
    }

    
Determines whether the image will be tiled in the output
stream and, if it will, how the tiling parameters will be
determined.  The modes are interpreted as follows:

    

  • MODE_DISABLED - The image will not be tiled. setTiling will throw an IllegalStateException. 
  • MODE_DEFAULT - The image will be tiled using default parameters. setTiling will throw an IllegalStateException. 
  • MODE_EXPLICIT - The image will be tiled according to parameters given in the setTiling method. Any previously set tiling parameters are discarded. 
  • MODE_COPY_FROM_METADATA - The image will conform to the metadata object passed in to a write. setTiling will throw an IllegalStateException. 


Params:
  • mode – The mode to use for tiling.
Throws:
See Also:
/**
     * Determines whether the image will be tiled in the output
     * stream and, if it will, how the tiling parameters will be
     * determined.  The modes are interpreted as follows:
     *
     * <ul>
     *
     * <li>{@code MODE_DISABLED} - The image will not be tiled.
     * {@code setTiling} will throw an
     * {@code IllegalStateException}.
     *
     * <li>{@code MODE_DEFAULT} - The image will be tiled using
     * default parameters.  {@code setTiling} will throw an
     * {@code IllegalStateException}.
     *
     * <li>{@code MODE_EXPLICIT} - The image will be tiled
     * according to parameters given in the {@link #setTiling setTiling}
     * method.  Any previously set tiling parameters are discarded.
     *
     * <li>{@code MODE_COPY_FROM_METADATA} - The image will
     * conform to the metadata object passed in to a write.
     * {@code setTiling} will throw an
     * {@code IllegalStateException}.
     *
     * </ul>
     *
     * @param mode The mode to use for tiling.
     *
     * @exception UnsupportedOperationException if
     * {@code canWriteTiles} returns {@code false}.
     * @exception IllegalArgumentException if {@code mode} is not
     * one of the modes listed above.
     *
     * @see #setTiling
     * @see #getTilingMode
     */
    public void setTilingMode(int mode) {
        if (canWriteTiles() == false) {
            throw new UnsupportedOperationException("Tiling not supported!");
        }
        if (mode < MODE_DISABLED || mode > MAX_MODE) {
            throw new IllegalArgumentException("Illegal value for mode!");
        }
        this.tilingMode = mode;
        if (mode == MODE_EXPLICIT) {
            unsetTiling();
        }
    }

    
Returns the current tiling mode, if tiling is supported. Otherwise throws an UnsupportedOperationException. 
Throws:
See Also:
Returns:the current tiling mode.
/**
     * Returns the current tiling mode, if tiling is supported.
     * Otherwise throws an {@code UnsupportedOperationException}.
     *
     * @return the current tiling mode.
     *
     * @exception UnsupportedOperationException if
     * {@code canWriteTiles} returns {@code false}.
     *
     * @see #setTilingMode
     */
    public int getTilingMode() {
        if (!canWriteTiles()) {
            throw new UnsupportedOperationException("Tiling not supported");
        }
        return tilingMode;
    }

    
Returns an array of Dimensions indicating the legal size ranges for tiles as they will be encoded in the output file or stream. The returned array is a copy. 
 The information is returned as a set of pairs; the first element of a pair contains an (inclusive) minimum width and height, and the second element contains an (inclusive) maximum width and height. Together, each pair defines a valid range of sizes. To specify a fixed size, use the same width and height for both elements. To specify an arbitrary range, a value of null is used in place of an actual array of Dimensions. 
 If no array is specified on the constructor, but tiling is allowed, then this method returns null. 
Throws:
Returns:an array of Dimensions with an even length of at least two, or null.
/**
     * Returns an array of {@code Dimension}s indicating the
     * legal size ranges for tiles as they will be encoded in the
     * output file or stream.  The returned array is a copy.
     *
     * <p> The information is returned as a set of pairs; the first
     * element of a pair contains an (inclusive) minimum width and
     * height, and the second element contains an (inclusive) maximum
     * width and height.  Together, each pair defines a valid range of
     * sizes.  To specify a fixed size, use the same width and height
     * for both elements.  To specify an arbitrary range, a value of
     * {@code null} is used in place of an actual array of
     * {@code Dimension}s.
     *
     * <p> If no array is specified on the constructor, but tiling is
     * allowed, then this method returns {@code null}.
     *
     * @exception UnsupportedOperationException if the plug-in does
     * not support tiling.
     *
     * @return an array of {@code Dimension}s with an even length
     * of at least two, or {@code null}.
     */
    public Dimension[] getPreferredTileSizes() {
        if (!canWriteTiles()) {
            throw new UnsupportedOperationException("Tiling not supported");
        }
        return clonePreferredTileSizes(preferredTileSizes);
    }

    
Specifies that the image should be tiled in the output stream. The tileWidth and tileHeight parameters specify the width and height of the tiles in the file. If the tile width or height is greater than the width or height of the image, the image is not tiled in that dimension. 
 If canOffsetTiles returns false, then the tileGridXOffset and tileGridYOffset parameters must be zero. 
Params:
  • tileWidth – the width of each tile.
  • tileHeight – the height of each tile.
  • tileGridXOffset – the horizontal offset of the tile grid.
  • tileGridYOffset – the vertical offset of the tile grid.
Throws:
See Also:
/**
     * Specifies that the image should be tiled in the output stream.
     * The {@code tileWidth} and {@code tileHeight}
     * parameters specify the width and height of the tiles in the
     * file.  If the tile width or height is greater than the width or
     * height of the image, the image is not tiled in that dimension.
     *
     * <p> If {@code canOffsetTiles} returns {@code false},
     * then the {@code tileGridXOffset} and
     * {@code tileGridYOffset} parameters must be zero.
     *
     * @param tileWidth the width of each tile.
     * @param tileHeight the height of each tile.
     * @param tileGridXOffset the horizontal offset of the tile grid.
     * @param tileGridYOffset the vertical offset of the tile grid.
     *
     * @exception UnsupportedOperationException if the plug-in does not
     * support tiling.
     * @exception IllegalStateException if the tiling mode is not
     * {@code MODE_EXPLICIT}.
     * @exception UnsupportedOperationException if the plug-in does not
     * support grid offsets, and the grid offsets are not both zero.
     * @exception IllegalArgumentException if the tile size is not
     * within one of the allowable ranges returned by
     * {@code getPreferredTileSizes}.
     * @exception IllegalArgumentException if {@code tileWidth}
     * or {@code tileHeight} is less than or equal to 0.
     *
     * @see #canWriteTiles
     * @see #canOffsetTiles
     * @see #getTileWidth()
     * @see #getTileHeight()
     * @see #getTileGridXOffset()
     * @see #getTileGridYOffset()
     */
    public void setTiling(int tileWidth,
                          int tileHeight,
                          int tileGridXOffset,
                          int tileGridYOffset) {
        if (!canWriteTiles()) {
            throw new UnsupportedOperationException("Tiling not supported!");
        }
        if (getTilingMode() != MODE_EXPLICIT) {
            throw new IllegalStateException("Tiling mode not MODE_EXPLICIT!");
        }
        if (tileWidth <= 0 || tileHeight <= 0) {
            throw new IllegalArgumentException
                ("tile dimensions are non-positive!");
        }
        boolean tilesOffset = (tileGridXOffset != 0) || (tileGridYOffset != 0);
        if (!canOffsetTiles() && tilesOffset) {
            throw new UnsupportedOperationException("Can't offset tiles!");
        }
        if (preferredTileSizes != null) {
            boolean ok = true;
            for (int i = 0; i < preferredTileSizes.length; i += 2) {
                Dimension min = preferredTileSizes[i];
                Dimension max = preferredTileSizes[i+1];
                if ((tileWidth < min.width) ||
                    (tileWidth > max.width) ||
                    (tileHeight < min.height) ||
                    (tileHeight > max.height)) {
                    ok = false;
                    break;
                }
            }
            if (!ok) {
                throw new IllegalArgumentException("Illegal tile size!");
            }
        }

        this.tilingSet = true;
        this.tileWidth = tileWidth;
        this.tileHeight = tileHeight;
        this.tileGridXOffset = tileGridXOffset;
        this.tileGridYOffset = tileGridYOffset;
    }

    
Removes any previous tile grid parameters specified by calls to setTiling. 
 The default implementation sets the instance variables tileWidth, tileHeight, tileGridXOffset, and tileGridYOffset to 0. 
Throws:
See Also:
/**
     * Removes any previous tile grid parameters specified by calls to
     * {@code setTiling}.
     *
     * <p> The default implementation sets the instance variables
     * {@code tileWidth}, {@code tileHeight},
     * {@code tileGridXOffset}, and
     * {@code tileGridYOffset} to {@code 0}.
     *
     * @exception UnsupportedOperationException if the plug-in does not
     * support tiling.
     * @exception IllegalStateException if the tiling mode is not
     * {@code MODE_EXPLICIT}.
     *
     * @see #setTiling(int, int, int, int)
     */
    public void unsetTiling() {
        if (!canWriteTiles()) {
            throw new UnsupportedOperationException("Tiling not supported!");
        }
        if (getTilingMode() != MODE_EXPLICIT) {
            throw new IllegalStateException("Tiling mode not MODE_EXPLICIT!");
        }
        this.tilingSet = false;
        this.tileWidth = 0;
        this.tileHeight = 0;
        this.tileGridXOffset = 0;
        this.tileGridYOffset = 0;
    }

    
Returns the width of each tile in an image as it will be written to the output stream. If tiling parameters have not been set, an IllegalStateException is thrown. 
Throws:
See Also:
Returns:the tile width to be used for encoding.
/**
     * Returns the width of each tile in an image as it will be
     * written to the output stream.  If tiling parameters have not
     * been set, an {@code IllegalStateException} is thrown.
     *
     * @return the tile width to be used for encoding.
     *
     * @exception UnsupportedOperationException if the plug-in does not
     * support tiling.
     * @exception IllegalStateException if the tiling mode is not
     * {@code MODE_EXPLICIT}.
     * @exception IllegalStateException if the tiling parameters have
     * not been set.
     *
     * @see #setTiling(int, int, int, int)
     * @see #getTileHeight()
     */
    public int getTileWidth() {
        if (!canWriteTiles()) {
            throw new UnsupportedOperationException("Tiling not supported!");
        }
        if (getTilingMode() != MODE_EXPLICIT) {
            throw new IllegalStateException("Tiling mode not MODE_EXPLICIT!");
        }
        if (!tilingSet) {
            throw new IllegalStateException("Tiling parameters not set!");
        }
        return tileWidth;
    }

    
Returns the height of each tile in an image as it will be written to the output stream. If tiling parameters have not been set, an IllegalStateException is thrown. 
Throws:
See Also:
Returns:the tile height to be used for encoding.
/**
     * Returns the height of each tile in an image as it will be written to
     * the output stream.  If tiling parameters have not
     * been set, an {@code IllegalStateException} is thrown.
     *
     * @return the tile height to be used for encoding.
     *
     * @exception UnsupportedOperationException if the plug-in does not
     * support tiling.
     * @exception IllegalStateException if the tiling mode is not
     * {@code MODE_EXPLICIT}.
     * @exception IllegalStateException if the tiling parameters have
     * not been set.
     *
     * @see #setTiling(int, int, int, int)
     * @see #getTileWidth()
     */
    public int getTileHeight() {
        if (!canWriteTiles()) {
            throw new UnsupportedOperationException("Tiling not supported!");
        }
        if (getTilingMode() != MODE_EXPLICIT) {
            throw new IllegalStateException("Tiling mode not MODE_EXPLICIT!");
        }
        if (!tilingSet) {
            throw new IllegalStateException("Tiling parameters not set!");
        }
        return tileHeight;
    }

    
Returns the horizontal tile grid offset of an image as it will be written to the output stream. If tiling parameters have not been set, an IllegalStateException is thrown. 
Throws:
See Also:
Returns:the tile grid X offset to be used for encoding.
/**
     * Returns the horizontal tile grid offset of an image as it will
     * be written to the output stream.  If tiling parameters have not
     * been set, an {@code IllegalStateException} is thrown.
     *
     * @return the tile grid X offset to be used for encoding.
     *
     * @exception UnsupportedOperationException if the plug-in does not
     * support tiling.
     * @exception IllegalStateException if the tiling mode is not
     * {@code MODE_EXPLICIT}.
     * @exception IllegalStateException if the tiling parameters have
     * not been set.
     *
     * @see #setTiling(int, int, int, int)
     * @see #getTileGridYOffset()
     */
    public int getTileGridXOffset() {
        if (!canWriteTiles()) {
            throw new UnsupportedOperationException("Tiling not supported!");
        }
        if (getTilingMode() != MODE_EXPLICIT) {
            throw new IllegalStateException("Tiling mode not MODE_EXPLICIT!");
        }
        if (!tilingSet) {
            throw new IllegalStateException("Tiling parameters not set!");
        }
        return tileGridXOffset;
    }

    
Returns the vertical tile grid offset of an image as it will be written to the output stream. If tiling parameters have not been set, an IllegalStateException is thrown. 
Throws:
See Also:
Returns:the tile grid Y offset to be used for encoding.
/**
     * Returns the vertical tile grid offset of an image as it will
     * be written to the output stream.  If tiling parameters have not
     * been set, an {@code IllegalStateException} is thrown.
     *
     * @return the tile grid Y offset to be used for encoding.
     *
     * @exception UnsupportedOperationException if the plug-in does not
     * support tiling.
     * @exception IllegalStateException if the tiling mode is not
     * {@code MODE_EXPLICIT}.
     * @exception IllegalStateException if the tiling parameters have
     * not been set.
     *
     * @see #setTiling(int, int, int, int)
     * @see #getTileGridXOffset()
     */
    public int getTileGridYOffset() {
        if (!canWriteTiles()) {
            throw new UnsupportedOperationException("Tiling not supported!");
        }
        if (getTilingMode() != MODE_EXPLICIT) {
            throw new IllegalStateException("Tiling mode not MODE_EXPLICIT!");
        }
        if (!tilingSet) {
            throw new IllegalStateException("Tiling parameters not set!");
        }
        return tileGridYOffset;
    }

    
Returns true if the writer can write out images as a series of passes of progressively increasing quality. 
See Also:
Returns:true if the writer supports progressive encoding.
/**
     * Returns {@code true} if the writer can write out images
     * as a series of passes of progressively increasing quality.
     *
     * @return {@code true} if the writer supports progressive
     * encoding.
     *
     * @see #setProgressiveMode
     * @see #getProgressiveMode
     */
    public boolean canWriteProgressive() {
        return canWriteProgressive;
    }

    
Specifies that the writer is to write the image out in a progressive mode such that the stream will contain a series of scans of increasing quality. If progressive encoding is not supported, an UnsupportedOperationException will be thrown. 
 The mode argument determines how the progression parameters are chosen, and must be either MODE_DISABLED, MODE_COPY_FROM_METADATA, or MODE_DEFAULT. Otherwise an IllegalArgumentException is thrown. 
 The modes are interpreted as follows:

    
  
  • MODE_DISABLED - No progression. Use this to turn off progression. 
  • MODE_COPY_FROM_METADATA - The output image will use whatever progression parameters are found in the metadata objects passed into the writer. 
  • MODE_DEFAULT - The image will be written progressively, with parameters chosen by the writer. 


 The default is MODE_COPY_FROM_METADATA. 
Params:
  • mode – The mode for setting progression in the output
stream.
Throws:
See Also:
/**
     * Specifies that the writer is to write the image out in a
     * progressive mode such that the stream will contain a series of
     * scans of increasing quality.  If progressive encoding is not
     * supported, an {@code UnsupportedOperationException} will
     * be thrown.
     *
     * <p>  The mode argument determines how
     * the progression parameters are chosen, and must be either
     * {@code MODE_DISABLED},
     * {@code MODE_COPY_FROM_METADATA}, or
     * {@code MODE_DEFAULT}.  Otherwise an
     * {@code IllegalArgumentException} is thrown.
     *
     * <p> The modes are interpreted as follows:
     *
     * <ul>
     *   <li>{@code MODE_DISABLED} - No progression.  Use this to
     *   turn off progression.
     *
     *   <li>{@code MODE_COPY_FROM_METADATA} - The output image
     *   will use whatever progression parameters are found in the
     *   metadata objects passed into the writer.
     *
     *   <li>{@code MODE_DEFAULT} - The image will be written
     *   progressively, with parameters chosen by the writer.
     * </ul>
     *
     * <p> The default is {@code MODE_COPY_FROM_METADATA}.
     *
     * @param mode The mode for setting progression in the output
     * stream.
     *
     * @exception UnsupportedOperationException if the writer does not
     * support progressive encoding.
     * @exception IllegalArgumentException if {@code mode} is not
     * one of the modes listed above.
     *
     * @see #getProgressiveMode
     */
    public void setProgressiveMode(int mode) {
        if (!canWriteProgressive()) {
            throw new UnsupportedOperationException(
                "Progressive output not supported");
        }
        if (mode < MODE_DISABLED || mode > MAX_MODE) {
            throw new IllegalArgumentException("Illegal value for mode!");
        }
        if (mode == MODE_EXPLICIT) {
            throw new IllegalArgumentException(
                "MODE_EXPLICIT not supported for progressive output");
        }
        this.progressiveMode = mode;
    }

    
Returns the current mode for writing the stream in a
progressive manner.

Throws:
See Also:
Returns:the current mode for progressive encoding.
/**
     * Returns the current mode for writing the stream in a
     * progressive manner.
     *
     * @return the current mode for progressive encoding.
     *
     * @exception UnsupportedOperationException if the writer does not
     * support progressive encoding.
     *
     * @see #setProgressiveMode
     */
    public int getProgressiveMode() {
        if (!canWriteProgressive()) {
            throw new UnsupportedOperationException
                ("Progressive output not supported");
        }
        return progressiveMode;
    }

    
Returns true if this writer supports compression. 
Returns:true if the writer supports compression.
/**
     * Returns {@code true} if this writer supports compression.
     *
     * @return {@code true} if the writer supports compression.
     */
    public boolean canWriteCompressed() {
        return canWriteCompressed;
    }

    
Specifies whether compression is to be performed, and if so how compression parameters are to be determined. The mode argument must be one of the four modes, interpreted as follows: 
    
  
  • MODE_DISABLED - If the mode is set to MODE_DISABLED, methods that query or modify the compression type or parameters will throw an IllegalStateException (if compression is normally supported by the plug-in). Some writers, such as JPEG, do not normally offer uncompressed output. In this case, attempting to set the mode to MODE_DISABLED will throw an UnsupportedOperationException and the mode will not be changed. 
  • MODE_EXPLICIT - Compress using the compression type and quality settings specified in this ImageWriteParam. Any previously set compression parameters are discarded. 
  • MODE_COPY_FROM_METADATA - Use whatever compression parameters are specified in metadata objects passed in to the writer. 
  • MODE_DEFAULT - Use default compression parameters. 


 The default is MODE_COPY_FROM_METADATA. 
Params:
  • mode – The mode for setting compression in the output
stream.
Throws:
See Also:
/**
     * Specifies whether compression is to be performed, and if so how
     * compression parameters are to be determined.  The {@code mode}
     * argument must be one of the four modes, interpreted as follows:
     *
     * <ul>
     *   <li>{@code MODE_DISABLED} - If the mode is set to
     *   {@code MODE_DISABLED}, methods that query or modify the
     *   compression type or parameters will throw an
     *   {@code IllegalStateException} (if compression is
     *   normally supported by the plug-in). Some writers, such as JPEG,
     *   do not normally offer uncompressed output. In this case, attempting
     *   to set the mode to {@code MODE_DISABLED} will throw an
     *   {@code UnsupportedOperationException} and the mode will not be
     *   changed.
     *
     *   <li>{@code MODE_EXPLICIT} - Compress using the
     *   compression type and quality settings specified in this
     *   {@code ImageWriteParam}.  Any previously set compression
     *   parameters are discarded.
     *
     *   <li>{@code MODE_COPY_FROM_METADATA} - Use whatever
     *   compression parameters are specified in metadata objects
     *   passed in to the writer.
     *
     *   <li>{@code MODE_DEFAULT} - Use default compression
     *   parameters.
     * </ul>
     *
     * <p> The default is {@code MODE_COPY_FROM_METADATA}.
     *
     * @param mode The mode for setting compression in the output
     * stream.
     *
     * @exception UnsupportedOperationException if the writer does not
     * support compression, or does not support the requested mode.
     * @exception IllegalArgumentException if {@code mode} is not
     * one of the modes listed above.
     *
     * @see #getCompressionMode
     */
    public void setCompressionMode(int mode) {
        if (!canWriteCompressed()) {
            throw new UnsupportedOperationException(
                "Compression not supported.");
        }
        if (mode < MODE_DISABLED || mode > MAX_MODE) {
            throw new IllegalArgumentException("Illegal value for mode!");
        }
        this.compressionMode = mode;
        if (mode == MODE_EXPLICIT) {
            unsetCompression();
        }
    }

    
Returns the current compression mode, if compression is
supported.

Throws:
See Also:
Returns:the current compression mode.
/**
     * Returns the current compression mode, if compression is
     * supported.
     *
     * @return the current compression mode.
     *
     * @exception UnsupportedOperationException if the writer does not
     * support compression.
     *
     * @see #setCompressionMode
     */
    public int getCompressionMode() {
        if (!canWriteCompressed()) {
            throw new UnsupportedOperationException(
                "Compression not supported.");
        }
        return compressionMode;
    }

    
Returns a list of available compression types, as an array or Strings, or null if a compression type may not be chosen using these interfaces. The array returned is a copy. 
 If the writer only offers a single, mandatory form of
compression, it is not necessary to provide any named
compression types.  Named compression types should only be
used where the user is able to make a meaningful choice
between different schemes.

 The default implementation checks if compression is supported and throws an UnsupportedOperationException if not. Otherwise, it returns a clone of the compressionTypes instance variable if it is non-null, or else returns null. 
Throws:
Returns:an array of Strings containing the (non-localized) names of available compression types, or null.
/**
     * Returns a list of available compression types, as an array or
     * {@code String}s, or {@code null} if a compression
     * type may not be chosen using these interfaces.  The array
     * returned is a copy.
     *
     * <p> If the writer only offers a single, mandatory form of
     * compression, it is not necessary to provide any named
     * compression types.  Named compression types should only be
     * used where the user is able to make a meaningful choice
     * between different schemes.
     *
     * <p> The default implementation checks if compression is
     * supported and throws an
     * {@code UnsupportedOperationException} if not.  Otherwise,
     * it returns a clone of the {@code compressionTypes}
     * instance variable if it is non-{@code null}, or else
     * returns {@code null}.
     *
     * @return an array of {@code String}s containing the
     * (non-localized) names of available compression types, or
     * {@code null}.
     *
     * @exception UnsupportedOperationException if the writer does not
     * support compression.
     */
    public String[] getCompressionTypes() {
        if (!canWriteCompressed()) {
            throw new UnsupportedOperationException(
                "Compression not supported");
        }
        if (compressionTypes == null) {
            return null;
        }
        return compressionTypes.clone();
    }

    
Sets the compression type to one of the values indicated by getCompressionTypes. If a value of null is passed in, any previous setting is removed. 
 The default implementation checks whether compression is supported and the compression mode is MODE_EXPLICIT. If so, it calls getCompressionTypes and checks if compressionType is one of the legal values. If it is, the compressionType instance variable is set. If compressionType is null, the instance variable is set without performing any checking. 
Params:
  • compressionType – one of the Strings returned by getCompressionTypes, or null to remove any previous setting.
Throws:
See Also:
/**
     * Sets the compression type to one of the values indicated by
     * {@code getCompressionTypes}.  If a value of
     * {@code null} is passed in, any previous setting is
     * removed.
     *
     * <p> The default implementation checks whether compression is
     * supported and the compression mode is
     * {@code MODE_EXPLICIT}.  If so, it calls
     * {@code getCompressionTypes} and checks if
     * {@code compressionType} is one of the legal values.  If it
     * is, the {@code compressionType} instance variable is set.
     * If {@code compressionType} is {@code null}, the
     * instance variable is set without performing any checking.
     *
     * @param compressionType one of the {@code String}s returned
     * by {@code getCompressionTypes}, or {@code null} to
     * remove any previous setting.
     *
     * @exception UnsupportedOperationException if the writer does not
     * support compression.
     * @exception IllegalStateException if the compression mode is not
     * {@code MODE_EXPLICIT}.
     * @exception UnsupportedOperationException if there are no
     * settable compression types.
     * @exception IllegalArgumentException if
     * {@code compressionType} is non-{@code null} but is not
     * one of the values returned by {@code getCompressionTypes}.
     *
     * @see #getCompressionTypes
     * @see #getCompressionType
     * @see #unsetCompression
     */
    public void setCompressionType(String compressionType) {
        if (!canWriteCompressed()) {
            throw new UnsupportedOperationException(
                "Compression not supported");
        }
        if (getCompressionMode() != MODE_EXPLICIT) {
            throw new IllegalStateException
                ("Compression mode not MODE_EXPLICIT!");
        }
        String[] legalTypes = getCompressionTypes();
        if (legalTypes == null) {
            throw new UnsupportedOperationException(
                "No settable compression types");
        }
        if (compressionType != null) {
            boolean found = false;
            if (legalTypes != null) {
                for (int i = 0; i < legalTypes.length; i++) {
                    if (compressionType.equals(legalTypes[i])) {
                        found = true;
                        break;
                    }
                }
            }
            if (!found) {
                throw new IllegalArgumentException("Unknown compression type!");
            }
        }
        this.compressionType = compressionType;
    }

    
Returns the currently set compression type, or null if none has been set. The type is returned as a String from among those returned by getCompressionTypes. If no compression type has been set, null is returned. 
 The default implementation checks whether compression is supported and the compression mode is MODE_EXPLICIT. If so, it returns the value of the compressionType instance variable. 
Throws:
See Also:
Returns:the current compression type as a String, or null if no type is set.
/**
     * Returns the currently set compression type, or
     * {@code null} if none has been set.  The type is returned
     * as a {@code String} from among those returned by
     * {@code getCompressionTypes}.
     * If no compression type has been set, {@code null} is
     * returned.
     *
     * <p> The default implementation checks whether compression is
     * supported and the compression mode is
     * {@code MODE_EXPLICIT}.  If so, it returns the value of the
     * {@code compressionType} instance variable.
     *
     * @return the current compression type as a {@code String},
     * or {@code null} if no type is set.
     *
     * @exception UnsupportedOperationException if the writer does not
     * support compression.
     * @exception IllegalStateException if the compression mode is not
     * {@code MODE_EXPLICIT}.
     *
     * @see #setCompressionType
     */
    public String getCompressionType() {
        if (!canWriteCompressed()) {
            throw new UnsupportedOperationException(
                "Compression not supported.");
        }
        if (getCompressionMode() != MODE_EXPLICIT) {
            throw new IllegalStateException
                ("Compression mode not MODE_EXPLICIT!");
        }
        return compressionType;
    }

    
Removes any previous compression type and quality settings.

 The default implementation sets the instance variable compressionType to null, and the instance variable compressionQuality to 1.0F. 
Throws:
See Also:
/**
     * Removes any previous compression type and quality settings.
     *
     * <p> The default implementation sets the instance variable
     * {@code compressionType} to {@code null}, and the
     * instance variable {@code compressionQuality} to
     * {@code 1.0F}.
     *
     * @exception UnsupportedOperationException if the plug-in does not
     * support compression.
     * @exception IllegalStateException if the compression mode is not
     * {@code MODE_EXPLICIT}.
     *
     * @see #setCompressionType
     * @see #setCompressionQuality
     */
    public void unsetCompression() {
        if (!canWriteCompressed()) {
            throw new UnsupportedOperationException(
                "Compression not supported");
        }
        if (getCompressionMode() != MODE_EXPLICIT) {
            throw new IllegalStateException
                ("Compression mode not MODE_EXPLICIT!");
        }
        this.compressionType = null;
        this.compressionQuality = 1.0F;
    }

    
Returns a localized version of the name of the current compression type, using the Locale returned by getLocale. 
 The default implementation checks whether compression is supported and the compression mode is MODE_EXPLICIT. If so, if compressionType is non-null the value of getCompressionType is returned as a convenience. 
Throws:
Returns:a String containing a localized version of the name of the current compression type.
/**
     * Returns a localized version of the name of the current
     * compression type, using the {@code Locale} returned by
     * {@code getLocale}.
     *
     * <p> The default implementation checks whether compression is
     * supported and the compression mode is
     * {@code MODE_EXPLICIT}.  If so, if
     * {@code compressionType} is {@code non-null} the value
     * of {@code getCompressionType} is returned as a
     * convenience.
     *
     * @return a {@code String} containing a localized version of
     * the name of the current compression type.
     *
     * @exception UnsupportedOperationException if the writer does not
     * support compression.
     * @exception IllegalStateException if the compression mode is not
     * {@code MODE_EXPLICIT}.
     * @exception IllegalStateException if no compression type is set.
     */
    public String getLocalizedCompressionTypeName() {
        if (!canWriteCompressed()) {
            throw new UnsupportedOperationException(
                "Compression not supported.");
        }
        if (getCompressionMode() != MODE_EXPLICIT) {
            throw new IllegalStateException
                ("Compression mode not MODE_EXPLICIT!");
        }
        if (getCompressionType() == null) {
            throw new IllegalStateException("No compression type set!");
        }
        return getCompressionType();
    }

    
Returns true if the current compression type provides lossless compression. If a plug-in provides only one mandatory compression type, then this method may be called without calling setCompressionType first. 
 If there are multiple compression types but none has been set, an IllegalStateException is thrown. 
 The default implementation checks whether compression is supported and the compression mode is MODE_EXPLICIT. If so, if getCompressionTypes() is null or getCompressionType() is non-null true is returned as a convenience. 
Throws:
Returns:true if the current compression type is lossless.
/**
     * Returns {@code true} if the current compression type
     * provides lossless compression.  If a plug-in provides only
     * one mandatory compression type, then this method may be
     * called without calling {@code setCompressionType} first.
     *
     * <p> If there are multiple compression types but none has
     * been set, an {@code IllegalStateException} is thrown.
     *
     * <p> The default implementation checks whether compression is
     * supported and the compression mode is
     * {@code MODE_EXPLICIT}.  If so, if
     * {@code getCompressionTypes()} is {@code null} or
     * {@code getCompressionType()} is non-{@code null}
     * {@code true} is returned as a convenience.
     *
     * @return {@code true} if the current compression type is
     * lossless.
     *
     * @exception UnsupportedOperationException if the writer does not
     * support compression.
     * @exception IllegalStateException if the compression mode is not
     * {@code MODE_EXPLICIT}.
     * @exception IllegalStateException if the set of legal
     * compression types is non-{@code null} and the current
     * compression type is {@code null}.
     */
    public boolean isCompressionLossless() {
        if (!canWriteCompressed()) {
            throw new UnsupportedOperationException(
                "Compression not supported");
        }
        if (getCompressionMode() != MODE_EXPLICIT) {
            throw new IllegalStateException
                ("Compression mode not MODE_EXPLICIT!");
        }
        if ((getCompressionTypes() != null) &&
            (getCompressionType() == null)) {
            throw new IllegalStateException("No compression type set!");
        }
        return true;
    }

    
Sets the compression quality to a value between 0 and 1. Only a single compression quality setting is supported by default; writers can provide extended versions of ImageWriteParam that offer more control. For lossy compression schemes, the compression quality should control the tradeoff between file size and image quality (for example, by choosing quantization tables when writing JPEG images). For lossless schemes, the compression quality may be used to control the tradeoff between file size and time taken to perform the compression (for example, by optimizing row filters and setting the ZLIB compression level when writing PNG images). 
 A compression quality setting of 0.0 is most generically
interpreted as "high compression is important," while a setting of
1.0 is most generically interpreted as "high image quality is
important."

 If there are multiple compression types but none has been set, an IllegalStateException is thrown. 
 The default implementation checks that compression is supported, and that the compression mode is MODE_EXPLICIT. If so, if getCompressionTypes() returns null or compressionType is non-null it sets the compressionQuality instance variable. 
Params:
  • quality – a float between 0 and 1 indicating the desired quality level.
Throws:
See Also:
/**
     * Sets the compression quality to a value between {@code 0}
     * and {@code 1}.  Only a single compression quality setting
     * is supported by default; writers can provide extended versions
     * of {@code ImageWriteParam} that offer more control.  For
     * lossy compression schemes, the compression quality should
     * control the tradeoff between file size and image quality (for
     * example, by choosing quantization tables when writing JPEG
     * images).  For lossless schemes, the compression quality may be
     * used to control the tradeoff between file size and time taken
     * to perform the compression (for example, by optimizing row
     * filters and setting the ZLIB compression level when writing
     * PNG images).
     *
     * <p> A compression quality setting of 0.0 is most generically
     * interpreted as "high compression is important," while a setting of
     * 1.0 is most generically interpreted as "high image quality is
     * important."
     *
     * <p> If there are multiple compression types but none has been
     * set, an {@code IllegalStateException} is thrown.
     *
     * <p> The default implementation checks that compression is
     * supported, and that the compression mode is
     * {@code MODE_EXPLICIT}.  If so, if
     * {@code getCompressionTypes()} returns {@code null} or
     * {@code compressionType} is non-{@code null} it sets
     * the {@code compressionQuality} instance variable.
     *
     * @param quality a {@code float} between {@code 0} and
     * {@code 1} indicating the desired quality level.
     *
     * @exception UnsupportedOperationException if the writer does not
     * support compression.
     * @exception IllegalStateException if the compression mode is not
     * {@code MODE_EXPLICIT}.
     * @exception IllegalStateException if the set of legal
     * compression types is non-{@code null} and the current
     * compression type is {@code null}.
     * @exception IllegalArgumentException if {@code quality} is
     * not between {@code 0} and {@code 1}, inclusive.
     *
     * @see #getCompressionQuality
     */
    public void setCompressionQuality(float quality) {
        if (!canWriteCompressed()) {
            throw new UnsupportedOperationException(
                "Compression not supported");
        }
        if (getCompressionMode() != MODE_EXPLICIT) {
            throw new IllegalStateException
                ("Compression mode not MODE_EXPLICIT!");
        }
        if (getCompressionTypes() != null && getCompressionType() == null) {
            throw new IllegalStateException("No compression type set!");
        }
        if (quality < 0.0F || quality > 1.0F) {
            throw new IllegalArgumentException("Quality out-of-bounds!");
        }
        this.compressionQuality = quality;
    }

    
Returns the current compression quality setting.

 If there are multiple compression types but none has been set, an IllegalStateException is thrown. 
 The default implementation checks that compression is supported and that the compression mode is MODE_EXPLICIT. If so, if getCompressionTypes() is null or getCompressionType() is non-null, it returns the value of the compressionQuality instance variable. 
Throws:
See Also:
Returns:the current compression quality setting.
/**
     * Returns the current compression quality setting.
     *
     * <p> If there are multiple compression types but none has been
     * set, an {@code IllegalStateException} is thrown.
     *
     * <p> The default implementation checks that compression is
     * supported and that the compression mode is
     * {@code MODE_EXPLICIT}.  If so, if
     * {@code getCompressionTypes()} is {@code null} or
     * {@code getCompressionType()} is non-{@code null}, it
     * returns the value of the {@code compressionQuality}
     * instance variable.
     *
     * @return the current compression quality setting.
     *
     * @exception UnsupportedOperationException if the writer does not
     * support compression.
     * @exception IllegalStateException if the compression mode is not
     * {@code MODE_EXPLICIT}.
     * @exception IllegalStateException if the set of legal
     * compression types is non-{@code null} and the current
     * compression type is {@code null}.
     *
     * @see #setCompressionQuality
     */
    public float getCompressionQuality() {
        if (!canWriteCompressed()) {
            throw new UnsupportedOperationException(
                "Compression not supported.");
        }
        if (getCompressionMode() != MODE_EXPLICIT) {
            throw new IllegalStateException
                ("Compression mode not MODE_EXPLICIT!");
        }
        if ((getCompressionTypes() != null) &&
            (getCompressionType() == null)) {
            throw new IllegalStateException("No compression type set!");
        }
        return compressionQuality;
    }


    
Returns a float indicating an estimate of the number of bits of output data for each bit of input image data at the given quality level. The value will typically lie between 0 and 1, with smaller values indicating more compression. A special value of -1.0F is used to indicate that no estimate is available. 
 If there are multiple compression types but none has been set, an IllegalStateException is thrown. 
 The default implementation checks that compression is supported and the compression mode is MODE_EXPLICIT. If so, if getCompressionTypes() is null or getCompressionType() is non-null, and quality is within bounds, it returns -1.0. 
Params:
  • quality – the quality setting whose bit rate is to be
queried.
Throws:
Returns:an estimate of the compressed bit rate, or -1.0F if no estimate is available.
/**
     * Returns a {@code float} indicating an estimate of the
     * number of bits of output data for each bit of input image data
     * at the given quality level.  The value will typically lie
     * between {@code 0} and {@code 1}, with smaller values
     * indicating more compression.  A special value of
     * {@code -1.0F} is used to indicate that no estimate is
     * available.
     *
     * <p> If there are multiple compression types but none has been set,
     * an {@code IllegalStateException} is thrown.
     *
     * <p> The default implementation checks that compression is
     * supported and the compression mode is
     * {@code MODE_EXPLICIT}.  If so, if
     * {@code getCompressionTypes()} is {@code null} or
     * {@code getCompressionType()} is non-{@code null}, and
     * {@code quality} is within bounds, it returns
     * {@code -1.0}.
     *
     * @param quality the quality setting whose bit rate is to be
     * queried.
     *
     * @return an estimate of the compressed bit rate, or
     * {@code -1.0F} if no estimate is available.
     *
     * @exception UnsupportedOperationException if the writer does not
     * support compression.
     * @exception IllegalStateException if the compression mode is not
     * {@code MODE_EXPLICIT}.
     * @exception IllegalStateException if the set of legal
     * compression types is non-{@code null} and the current
     * compression type is {@code null}.
     * @exception IllegalArgumentException if {@code quality} is
     * not between {@code 0} and {@code 1}, inclusive.
     */
    public float getBitRate(float quality) {
        if (!canWriteCompressed()) {
            throw new UnsupportedOperationException(
                "Compression not supported.");
        }
        if (getCompressionMode() != MODE_EXPLICIT) {
            throw new IllegalStateException
                ("Compression mode not MODE_EXPLICIT!");
        }
        if ((getCompressionTypes() != null) &&
            (getCompressionType() == null)) {
            throw new IllegalStateException("No compression type set!");
        }
        if (quality < 0.0F || quality > 1.0F) {
            throw new IllegalArgumentException("Quality out-of-bounds!");
        }
        return -1.0F;
    }

    
Returns an array of Strings that may be used along with getCompressionQualityValues as part of a user interface for setting or displaying the compression quality level. The String with index i provides a description of the range of quality levels between getCompressionQualityValues[i] and getCompressionQualityValues[i + 1]. Note that the length of the array returned from getCompressionQualityValues will always be one greater than that returned from getCompressionQualityDescriptions. 
 As an example, the strings "Good", "Better", and "Best" could be associated with the ranges [0, .33), [.33, .66), and [.66, 1.0]. In this case, getCompressionQualityDescriptions would return { "Good", "Better", "Best" } and getCompressionQualityValues would return { 0.0F, .33F, .66F, 1.0F }. 
 If no descriptions are available, null is returned. If null is returned from getCompressionQualityValues, this method must also return null. 
 The descriptions should be localized for the Locale returned by getLocale, if it is non-null. 
 If there are multiple compression types but none has been set, an IllegalStateException is thrown. 
 The default implementation checks that compression is supported and that the compression mode is MODE_EXPLICIT. If so, if getCompressionTypes() is null or getCompressionType() is non-null, it returns null. 
Throws:
See Also:
Returns:an array of Strings containing localized descriptions of the compression quality levels.
/**
     * Returns an array of {@code String}s that may be used along
     * with {@code getCompressionQualityValues} as part of a user
     * interface for setting or displaying the compression quality
     * level.  The {@code String} with index {@code i}
     * provides a description of the range of quality levels between
     * {@code getCompressionQualityValues[i]} and
     * {@code getCompressionQualityValues[i + 1]}.  Note that the
     * length of the array returned from
     * {@code getCompressionQualityValues} will always be one
     * greater than that returned from
     * {@code getCompressionQualityDescriptions}.
     *
     * <p> As an example, the strings "Good", "Better", and "Best"
     * could be associated with the ranges {@code [0, .33)},
     * {@code [.33, .66)}, and {@code [.66, 1.0]}.  In this
     * case, {@code getCompressionQualityDescriptions} would
     * return {@code { "Good", "Better", "Best" }} and
     * {@code getCompressionQualityValues} would return
     * {@code { 0.0F, .33F, .66F, 1.0F }}.
     *
     * <p> If no descriptions are available, {@code null} is
     * returned.  If {@code null} is returned from
     * {@code getCompressionQualityValues}, this method must also
     * return {@code null}.
     *
     * <p> The descriptions should be localized for the
     * {@code Locale} returned by {@code getLocale}, if it
     * is non-{@code null}.
     *
     * <p> If there are multiple compression types but none has been set,
     * an {@code IllegalStateException} is thrown.
     *
     * <p> The default implementation checks that compression is
     * supported and that the compression mode is
     * {@code MODE_EXPLICIT}.  If so, if
     * {@code getCompressionTypes()} is {@code null} or
     * {@code getCompressionType()} is non-{@code null}, it
     * returns {@code null}.
     *
     * @return an array of {@code String}s containing localized
     * descriptions of the compression quality levels.
     *
     * @exception UnsupportedOperationException if the writer does not
     * support compression.
     * @exception IllegalStateException if the compression mode is not
     * {@code MODE_EXPLICIT}.
     * @exception IllegalStateException if the set of legal
     * compression types is non-{@code null} and the current
     * compression type is {@code null}.
     *
     * @see #getCompressionQualityValues
     */
    public String[] getCompressionQualityDescriptions() {
        if (!canWriteCompressed()) {
            throw new UnsupportedOperationException(
                "Compression not supported.");
        }
        if (getCompressionMode() != MODE_EXPLICIT) {
            throw new IllegalStateException
                ("Compression mode not MODE_EXPLICIT!");
        }
        if ((getCompressionTypes() != null) &&
            (getCompressionType() == null)) {
            throw new IllegalStateException("No compression type set!");
        }
        return null;
    }

    
Returns an array of floats that may be used along with getCompressionQualityDescriptions as part of a user interface for setting or displaying the compression quality level. See 
getCompressionQualityDescriptions for more information. 
 If no descriptions are available, null is returned. If null is returned from getCompressionQualityDescriptions, this method must also return null. 
 If there are multiple compression types but none has been set, an IllegalStateException is thrown. 
 The default implementation checks that compression is supported and that the compression mode is MODE_EXPLICIT. If so, if getCompressionTypes() is null or getCompressionType() is non-null, it returns null. 
Throws:
See Also:
Returns:an array of floats indicating the boundaries between the compression quality levels as described by the Strings from getCompressionQualityDescriptions.
/**
     * Returns an array of {@code float}s that may be used along
     * with {@code getCompressionQualityDescriptions} as part of a user
     * interface for setting or displaying the compression quality
     * level.  See {@link #getCompressionQualityDescriptions
     * getCompressionQualityDescriptions} for more information.
     *
     * <p> If no descriptions are available, {@code null} is
     * returned.  If {@code null} is returned from
     * {@code getCompressionQualityDescriptions}, this method
     * must also return {@code null}.
     *
     * <p> If there are multiple compression types but none has been set,
     * an {@code IllegalStateException} is thrown.
     *
     * <p> The default implementation checks that compression is
     * supported and that the compression mode is
     * {@code MODE_EXPLICIT}.  If so, if
     * {@code getCompressionTypes()} is {@code null} or
     * {@code getCompressionType()} is non-{@code null}, it
     * returns {@code null}.
     *
     * @return an array of {@code float}s indicating the
     * boundaries between the compression quality levels as described
     * by the {@code String}s from
     * {@code getCompressionQualityDescriptions}.
     *
     * @exception UnsupportedOperationException if the writer does not
     * support compression.
     * @exception IllegalStateException if the compression mode is not
     * {@code MODE_EXPLICIT}.
     * @exception IllegalStateException if the set of legal
     * compression types is non-{@code null} and the current
     * compression type is {@code null}.
     *
     * @see #getCompressionQualityDescriptions
     */
    public float[] getCompressionQualityValues() {
        if (!canWriteCompressed()) {
            throw new UnsupportedOperationException(
                "Compression not supported.");
        }
        if (getCompressionMode() != MODE_EXPLICIT) {
            throw new IllegalStateException
                ("Compression mode not MODE_EXPLICIT!");
        }
        if ((getCompressionTypes() != null) &&
            (getCompressionType() == null)) {
            throw new IllegalStateException("No compression type set!");
        }
        return null;
    }
}