/*
* @(#)JPEGDecodeParam.java 1.10 06/06/29
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
/**********************************************************************
**********************************************************************
**********************************************************************
*** COPYRIGHT (c) 1997-1998 Eastman Kodak Company. ***
*** As an unpublished work pursuant to Title 17 of the United ***
*** States Code. All rights reserved. ***
**********************************************************************
**********************************************************************
**********************************************************************/
package com.sun.image.codec.jpeg;
/**
* JPEGDecodeParam encapsulates tables and options necessary to
* control decoding JPEG datastreams. Parameters are either set explicitly
* by the application for encoding, or read from the JPEG header for
* decoding. In the case of decoding abbreviated data streams the
* application may need to set some/all of the values it's self. <p>
* When working with BufferedImages ({@link
* com.sun.image.codec.jpeg.JPEGImageDecoder#decodeAsBufferedImage}),
* the codec will attempt to
* generate an appropriate ColorModel for the JPEG COLOR_ID. This is
* not always possible (example mappings are listed below) . In cases
* where unsupported conversions are required, or unknown encoded
* COLOR_ID's are in use, the user must request the data as a Raster
* and perform the transformations themselves. When decoding into a
* raster ({@link com.sun.image.codec.jpeg.JPEGImageDecoder#decodeAsRaster})
* no ColorSpace adjustments are made.
* Note: The color ids described herein are simply enumerated values
* that influence data processing by the JPEG codec. JPEG compression
* is by definition color blind. These values are used as hints when
* decompressing JPEG data. Of particular interest is the default
* conversion from YCbCr to sRGB when decoding buffered Images.<P>
* Note: because JPEG is mostly color-blind color fidelity can not be
* garunteed. This will hopefully be rectified in the near future by
* the wide spread inclusion of ICC-profiles in the JPEG data stream
* (as a special marker).
* The following is an example of the conversions that take place.
* This is only a guide to the types of conversions that are allowed.
* This list is likely to change in the future so it is
* <B>strongly</B> recommended that you check for thrown
* ImageFormatExceptions and check the actual ColorModel associated
* with the BufferedImage returned rather than make assumtions.
* <pre>
DECODING:
JPEG (Encoded) Color ID BufferedImage ColorSpace
======================= ========================
COLOR_ID_UNKNOWN ** Invalid **
COLOR_ID_GRAY CS_GRAY
COLOR_ID_RGB CS_sRGB
COLOR_ID_YCbCr CS_sRGB
COLOR_ID_CMYK ** Invalid **
COLOR_ID_PYCC CS_PYCC
COLOR_ID_RGBA CS_sRGB (w/ alpha)
COLOR_ID_YCbCrA CS_sRGB (w/ alpha)
COLOR_ID_RGBA_INVERTED ** Invalid **
COLOR_ID_YCbCrA_INVERTED ** Invalid **
COLOR_ID_PYCCA CS_PYCC (w/ alpha)
COLOR_ID_YCCK ** Invalid **
</pre>
* If the user needs better control over conversion, the user must
* request the data as a Raster and handle the conversion of the image
* data themselves.<p>
* When decoding JFIF files the encoded COLOR_ID will always be one
* of: COLOR_ID_UNKNOWN, COLOR_ID_GRAY, COLOR_ID_RGB, COLOR_ID_YCbCr,
* COLOR_ID_CMYK, or COLOR_ID_YCCK
* <p>
* Note that the classes in the com.sun.image.codec.jpeg package are not
* part of the core Java APIs. They are a part of Sun's JDK and JRE
* distributions. Although other licensees may choose to distribute these
* classes, developers cannot depend on their availability in non-Sun
* implementations. We expect that equivalent functionality will eventually
* be available in a core API or standard extension.
* <p>
*/
public interface JPEGDecodeParam extends Cloneable {
/** Unknown or Undefined Color ID */
public final static int COLOR_ID_UNKNOWN = 0;
/** Monochrome */
public final static int COLOR_ID_GRAY = 1;
/** Red, Green, and Blue */
public final static int COLOR_ID_RGB = 2;
/** YCbCr */
public final static int COLOR_ID_YCbCr = 3;
/** CMYK */
public final static int COLOR_ID_CMYK = 4;
/** PhotoYCC */
public final static int COLOR_ID_PYCC = 5;
/** RGB-Alpha */
public final static int COLOR_ID_RGBA = 6;
/** YCbCr-Alpha */
public final static int COLOR_ID_YCbCrA = 7;
/** RGB-Alpha with R, G, and B inverted.*/
public final static int COLOR_ID_RGBA_INVERTED = 8;
/** YCbCr-Alpha with Y, Cb, and Cr inverted.*/
public final static int COLOR_ID_YCbCrA_INVERTED = 9;
/** PhotoYCC-Alpha */
public final static int COLOR_ID_PYCCA = 10;
/** YCbCrK */
public final static int COLOR_ID_YCCK = 11;
/** Number of color ids defined. */
final static int NUM_COLOR_ID = 12;
/** Number of allowed Huffman and Quantization Tables */
final static int NUM_TABLES = 4;
/** The X and Y units simply indicate the aspect ratio of the pixels. */
public final static int DENSITY_UNIT_ASPECT_RATIO = 0;
/** Pixel density is in pixels per inch. */
public final static int DENSITY_UNIT_DOTS_INCH = 1;
/** Pixel density is in pixels per centemeter. */
public final static int DENSITY_UNIT_DOTS_CM = 2;
/** The max known value for DENSITY_UNIT */
final static int NUM_DENSITY_UNIT = 3;
/** APP0 marker - JFIF info */
public final static int APP0_MARKER = 0xE0;
/** APP1 marker */
public final static int APP1_MARKER = 0xE1;
/** APP2 marker */
public final static int APP2_MARKER = 0xE2;
/** APP3 marker */
public final static int APP3_MARKER = 0xE3;
/** APP4 marker */
public final static int APP4_MARKER = 0xE4;
/** APP5 marker */
public final static int APP5_MARKER = 0xE5;
/** APP6 marker */
public final static int APP6_MARKER = 0xE6;
/** APP7 marker */
public final static int APP7_MARKER = 0xE7;
/** APP8 marker */
public final static int APP8_MARKER = 0xE8;
/** APP9 marker */
public final static int APP9_MARKER = 0xE9;
/** APPA marker */
public final static int APPA_MARKER = 0xEA;
/** APPB marker */
public final static int APPB_MARKER = 0xEB;
/** APPC marker */
public final static int APPC_MARKER = 0xEC;
/** APPD marker */
public final static int APPD_MARKER = 0xED;
/** APPE marker - Adobe info */
public final static int APPE_MARKER = 0xEE;
/** APPF marker */
public final static int APPF_MARKER = 0xEF;
/** Adobe marker indicates presence/need for Adobe marker. */
public final static int COMMENT_MARKER = 0XFE;
public Object clone();
/**
* Get the image width
* @return int the width of the image data in pixels.
*/
public int getWidth();
/** Get the image height
* @return The height of the image data in pixels.
*/
public int getHeight();
/**
* Return the Horizontal subsampling factor for requested
* Component. The Subsample factor is the number of input pixels
* that contribute to each output pixel. This is distinct from
* the way the JPEG to each output pixel. This is distinct from
* the way the JPEG standard defines this quantity, because
* fractional subsampling factors are not allowed, and it was felt
* @param component The component of the encoded image to return
* the subsampling factor for.
* @return The subsample factor.
*/
public int getHorizontalSubsampling(int component);
/**
* Return the Vertical subsampling factor for requested
* Component. The Subsample factor is the number of input pixels
* that contribute to each output pixel. This is distinct from
* the way the JPEG to each output pixel. This is distinct from
* the way the JPEG standard defines this quantity, because
* fractional subsampling factors are not allowed, and it was felt
* @param component The component of the encoded image to return
* the subsampling factor for.
* @return The subsample factor.
*/
public int getVerticalSubsampling(int component);
/**
* Returns the coefficient quantization tables or NULL if not
* defined. tableNum must range in value from 0 - 3.
* @param tableNum the index of the table to be returned.
* @return Quantization table stored at index tableNum.
*/
public JPEGQTable getQTable(int tableNum );
/**
* Returns the Quantization table for the requested component.
* @param component the image component of interest.
* @return Quantization table associated with component
*/
public JPEGQTable getQTableForComponent(int component);
/**
* Returns the DC Huffman coding table requested or null if
* not defined
* @param tableNum the index of the table to be returned.
* @return Huffman table stored at index tableNum.
*/
public JPEGHuffmanTable getDCHuffmanTable( int tableNum );
/**
* Returns the DC Huffman coding table for the requested component.
* @param component the image component of interest.
* @return Huffman table associated with component
*/
public JPEGHuffmanTable getDCHuffmanTableForComponent(int component);
/**
* Returns the AC Huffman coding table requested or null if
* not defined
* @param tableNum the index of the table to be returned.
* @return Huffman table stored at index tableNum.
*/
public JPEGHuffmanTable getACHuffmanTable( int tableNum );
/**
* Returns the AC Huffman coding table for the requested component.
* @param component the image component of interest.
* @return Huffman table associated with component
*/
public JPEGHuffmanTable getACHuffmanTableForComponent(int component);
/**
* Get the number of the DC Huffman table that will be used for
* a particular component.
* @param component The Component of interest.
* @return The table number of the DC Huffman table for component.
*/
public int getDCHuffmanComponentMapping(int component);
/**
* Get the number of the AC Huffman table that will be used for
* a particular component.
* @param component The Component of interest.
* @return The table number of the AC Huffman table for component.
*/
public int getACHuffmanComponentMapping(int component);
/**
* Get the number of the quantization table that will be used for
* a particular component.
* @param component The Component of interest.
* @return The table number of the Quantization table for component.
*/
public int getQTableComponentMapping(int component);
/**
* Returns true if the image information in the ParamBlock is
* currently valid. This indicates if image data was read from
* the stream for decoding and weather image data should be
* written when encoding.
*/
public boolean isImageInfoValid();
/**
* Returns true if the tables in the ParamBlock are currently
* valid. This indicates that tables were read from the stream
* for decoding. When encoding this indicates wether tables should
* be written to the stream.
*/
public boolean isTableInfoValid();
/**
* Returns true if at least one instance of the marker is present
* in the Parameter object. For encoding returns true if there
* is at least one instance of the marker to be written.
* @param marker The marker of interest.
*/
public boolean getMarker(int marker);
/**
* Returns a 'byte[][]' associated with the requested marker in
* the parameter object. Each entry in the 'byte[][]' is the data
* associated with one instance of the marker (each marker can
* theoretically appear any number of times in a stream).
* @param marker The marker of interest.
* @return The 'byte[][]' for this marker or null if none
* available.
*/
public byte[][] getMarkerData(int marker);
/**
* Returns the JPEG Encoded color id. This is generally
* speaking only used if you are decoding into Rasters. Note
* that when decoding into a Raster no color conversion is
* performed.
* @return The value of the JPEG encoded data's color id.
*/
public int getEncodedColorID();
/**
* Returns the number of components for the current encoding
* COLOR_ID.
* @return the number of Components
*/
public int getNumComponents();
/**
* Get the MCUs per restart marker.
* @return The number of MCUs between restart markers.
*/
public int getRestartInterval();
/**
* Get the code for pixel size units This value is copied from the
* APP0 marker. It isn't used by the JPEG codec. If the APP0
* marker wasn't present then you can not rely on this value.
* @return Value indicating the density unit one of the
* DENSITY_UNIT_* constants.
*/
public int getDensityUnit();
/**
* Get the horizontal pixel density This value is copied from the
* APP0 marker. It isn't used by the JPEG code. If the APP0
* marker wasn't present then you can not rely on this value.
* @return The horizontal pixel density, in units described by
* @see #getDensityUnit()
*/
public int getXDensity();
/**
* Get the vertical pixel density This value is copied into the
* APP0 marker. It isn't used by the JPEG code. If the APP0 marker
* wasn't present then you can not rely on this value.
* @return The verticle pixel density, in units described by
* @see #getDensityUnit()
*/
public int getYDensity();
}
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