| /* |
| * Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| 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 {@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 |
| * {@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 |
| * {@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 |
| * {@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 |
| * {@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 {@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 {@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 {@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 {@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. |
| * |
| * <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 {@code 0}. |
| * |
| * <p> Subclasses that do not support tiling may ignore this |
| * value. |
| */ |
| protected int tileHeight = 0; |
| |
| /** |
| * 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 {@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 {@code 0}. |
| * |
| * <p> Subclasses that do not support offsetting tiles may ignore |
| * this value. |
| */ |
| protected int tileGridYOffset = 0; |
| |
| /** |
| * 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 {@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 {@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 {@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 {@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 {@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 {@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 {@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 {@code ImageWriteParam}. It is up to |
| * the subclass to set up the instance variables properly. |
| */ |
| protected ImageWriteParam() {} |
| |
| /** |
| * 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 {@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 {@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 {@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: |
| * |
| * <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 {@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 {@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 {@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 |
| * {@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 {@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 {@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 {@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 {@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 {@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 {@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. |
| * |
| * @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 {@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 {@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. |
| * |
| * @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 |
| * {@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 |
| * {@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 |
| * {@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. |
| * |
| * <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 {@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 {@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 {@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. |
| * |
| * <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 {@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 {@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 {@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; |
| } |
| } |
