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fine-third/fine-jai/src/main/java/com/fr/third/JAI/TIFFImage.java

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/*
* Copyright (c) 2001 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* -Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* -Redistribution in binary form must reproduct the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
* NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
* LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
* OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
* LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
* INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
* CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
* OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that Software is not designed,licensed or intended for use in
* the design, construction, operation or maintenance of any nuclear facility.
*/
package com.fr.third.JAI;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Transparency;
import java.awt.color.ColorSpace;
import java.awt.image.ColorModel;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferByte;
import java.awt.image.DataBufferShort;
import java.awt.image.DataBufferUShort;
import java.awt.image.DataBufferInt;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import java.awt.image.RenderedImage;
import java.awt.image.SampleModel;
import java.awt.image.IndexColorModel;
import java.awt.image.MultiPixelPackedSampleModel;
import java.awt.image.PixelInterleavedSampleModel;
import java.awt.image.ComponentColorModel;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.InputStream;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.text.MessageFormat;
import java.util.Locale;
import java.util.zip.DataFormatException;
import java.util.zip.Inflater;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGDecodeParam;
import com.sun.image.codec.jpeg.JPEGImageDecoder;
public class TIFFImage extends SimpleRenderedImage {
// Compression types
public static final int COMP_NONE = 1;
public static final int COMP_FAX_G3_1D = 2;
public static final int COMP_FAX_G3_2D = 3;
public static final int COMP_FAX_G4_2D = 4;
public static final int COMP_LZW = 5;
public static final int COMP_JPEG_OLD = 6;
public static final int COMP_JPEG_TTN2 = 7;
public static final int COMP_PACKBITS = 32773;
public static final int COMP_DEFLATE = 32946;
// Image types
private static final int TYPE_UNSUPPORTED = -1;
private static final int TYPE_BILEVEL = 0;
private static final int TYPE_GRAY_4BIT = 1;
private static final int TYPE_GRAY = 2;
private static final int TYPE_GRAY_ALPHA = 3;
private static final int TYPE_PALETTE = 4;
private static final int TYPE_RGB = 5;
private static final int TYPE_RGB_ALPHA = 6;
private static final int TYPE_YCBCR_SUB = 7;
private static final int TYPE_GENERIC = 8;
// Incidental tags
private static final int TIFF_JPEG_TABLES = 347;
private static final int TIFF_YCBCR_SUBSAMPLING = 530;
SeekableStream stream;
private boolean isTiled;
int tileSize;
int tilesX, tilesY;
long[] tileOffsets;
long[] tileByteCounts;
char[] colormap;
int sampleSize;
int compression;
byte[] palette;
int numBands;
int chromaSubH;
int chromaSubV;
// Fax compression related variables
long tiffT4Options;
long tiffT6Options;
int fillOrder;
// LZW compression related variable
int predictor;
// TTN2 JPEG related variables
JPEGDecodeParam decodeParam = null;
boolean colorConvertJPEG = false;
// DEFLATE variables
Inflater inflater = null;
// Endian-ness indicator
boolean isBigEndian;
int imageType;
boolean isWhiteZero = false;
int dataType;
boolean decodePaletteAsShorts;
// Decoders
private TIFFFaxDecoder decoder = null;
private TIFFLZWDecoder lzwDecoder = null;
/**
* Decode a buffer of data into a Raster with the specified location.
*
* @param data buffer contain an interchange or abbreviated datastream.
* @param decodeParam decoding parameters; may be null unless the
* data buffer contains an abbreviated datastream in which case
* it may not be null or an error will occur.
* @param colorConvert whether to perform color conversion; in this
* case that would be limited to YCbCr-to-RGB.
* @param minX the X position of the returned Raster.
* @param minY the Y position of the returned Raster.
*/
private static final Raster decodeJPEG(byte[] data,
JPEGDecodeParam decodeParam,
boolean colorConvert,
int minX,
int minY) {
// Create an InputStream from the compressed data array.
ByteArrayInputStream jpegStream = new ByteArrayInputStream(data);
// Create a decoder.
JPEGImageDecoder decoder = decodeParam == null ?
JPEGCodec.createJPEGDecoder(jpegStream) :
JPEGCodec.createJPEGDecoder(jpegStream,
decodeParam);
// Decode the compressed data into a Raster.
Raster jpegRaster;
try {
jpegRaster = colorConvert ?
decoder.decodeAsBufferedImage().getWritableTile(0, 0) :
decoder.decodeAsRaster();
} catch (IOException ioe) {
throw new RuntimeException(JaiI18N.getString("TIFFImage13"));
}
// Translate the decoded Raster to the specified location and return.
return jpegRaster.createTranslatedChild(minX, minY);
}
/**
* Inflates <code>deflated</code> into <code>inflated</code> using the
* <code>Inflater</code> constructed during class instantiation.
*/
private final void inflate(byte[] deflated, byte[] inflated) {
inflater.setInput(deflated);
try {
inflater.inflate(inflated);
} catch(DataFormatException dfe) {
throw new RuntimeException(JaiI18N.getString("TIFFImage17")+": "+
dfe.getMessage());
}
inflater.reset();
}
/**
* Creates a pixel-interleaved <code>SampleModel</code>. This is a hack
* to work around a cast exception when using JAI with float data.
*/
private final static SampleModel
createPixelInterleavedSampleModel(int dataType,
int tileWidth,
int tileHeight,
int pixelStride,
int scanlineStride,
int bandOffsets[]) {
SampleModel sampleModel = null;
if(dataType == DataBuffer.TYPE_FLOAT) {
// This is a hack to make this work with JAI which in some
// cases downcasts the DataBuffer to a type-specific class.
// In the case of float data this current means the JAI class
// javax.media.jai.DataBufferFloat.
try {
Class rfClass =
Class.forName("javax.media.jai.RasterFactory");
Class[] paramTypes = new Class[] {int.class, int.class,
int.class, int.class,
int.class, int[].class};
Method rfMthd =
rfClass.getMethod("createPixelInterleavedSampleModel",
paramTypes);
Object[] params =
new Object[] {new Integer(dataType),
new Integer(tileWidth),
new Integer(tileHeight),
new Integer(pixelStride),
new Integer(scanlineStride),
bandOffsets};
sampleModel = (SampleModel)rfMthd.invoke(null, params);
} catch(Exception e) {
// Deliberately ignore the Exception.
}
}
// Create a SampleModel for non-float data or, in the case of
// float data, if it is still null. This latter case should occur
// if and only if the decoder is being used without JAI.
if(dataType != DataBuffer.TYPE_FLOAT || sampleModel == null) {
sampleModel =
RasterFactory.createPixelInterleavedSampleModel(dataType,
tileWidth,
tileHeight,
pixelStride,
scanlineStride,
bandOffsets);
}
return sampleModel;
}
/**
* Return as a long[] the value of a TIFF_LONG or TIFF_SHORT field.
*/
private final long[] getFieldAsLongs(TIFFField field) {
long[] value = null;
if(field.getType() == TIFFField.TIFF_SHORT) {
char[] charValue = field.getAsChars();
value = new long[charValue.length];
for(int i = 0; i < charValue.length; i++) {
value[i] = charValue[i] & 0xffff;
}
} else if(field.getType() == TIFFField.TIFF_LONG) {
value = field.getAsLongs();
} else {
throw new RuntimeException();
}
return value;
}
/*
* Check whether the specified tag exists in the specified
* TIFFDirectory. If not, throw an error message. Otherwise
* return the TIFFField.
*/
private TIFFField getField(TIFFDirectory dir, int tagID, String tagName) {
TIFFField field = dir.getField(tagID);
if (field == null) {
MessageFormat mf =
new MessageFormat(JaiI18N.getString("TIFFImage5"));
mf.setLocale(Locale.getDefault());
throw new RuntimeException(mf.format(new Object[] {tagName}));
} else {
return field;
}
}
/**
* Constructs a TIFFImage that acquires its data from a given
* SeekableStream and reads from a particular IFD of the stream.
* The index of the first IFD is 0.
*
* @param stream the SeekableStream to read from.
* @param param an instance of TIFFDecodeParam, or null.
* @param directory the index of the IFD to read from.
*/
public TIFFImage(SeekableStream stream,
TIFFDecodeParam param,
int directory)
throws IOException {
this.stream = stream;
if (param == null) {
param = new TIFFDecodeParam();
}
decodePaletteAsShorts = param.getDecodePaletteAsShorts();
// Read the specified directory.
TIFFDirectory dir = param.getIFDOffset() == null ?
new TIFFDirectory(stream, directory) :
new TIFFDirectory(stream, param.getIFDOffset().longValue(),
directory);
// Set a property "tiff_directory".
properties.put("tiff_directory", dir);
// Get the number of samples per pixel
TIFFField sfield =
dir.getField(TIFFImageDecoder.TIFF_SAMPLES_PER_PIXEL);
int samplesPerPixel = sfield == null ? 1 : (int)sfield.getAsLong(0);
// Read the TIFF_PLANAR_CONFIGURATION field
TIFFField planarConfigurationField =
dir.getField(TIFFImageDecoder.TIFF_PLANAR_CONFIGURATION);
char[] planarConfiguration = planarConfigurationField == null ?
new char[] {1} :
planarConfigurationField.getAsChars();
// Support planar format (band sequential) only for 1 sample/pixel.
if (planarConfiguration[0] != 1 && samplesPerPixel != 1) {
throw new RuntimeException(JaiI18N.getString("TIFFImage0"));
}
// Read the TIFF_BITS_PER_SAMPLE field
TIFFField bitsField =
dir.getField(TIFFImageDecoder.TIFF_BITS_PER_SAMPLE);
char[] bitsPerSample = null;
if(bitsField != null) {
bitsPerSample = bitsField.getAsChars();
} else {
bitsPerSample = new char[] {1};
// Ensure that all samples have the same bit depth.
for (int i = 1; i < bitsPerSample.length; i++) {
if (bitsPerSample[i] != bitsPerSample[0]) {
throw new RuntimeException(
JaiI18N.getString("TIFFImage1"));
}
}
}
sampleSize = (int)bitsPerSample[0];
// Read the TIFF_SAMPLE_FORMAT tag to see whether the data might be
// signed or floating point
TIFFField sampleFormatField =
dir.getField(TIFFImageDecoder.TIFF_SAMPLE_FORMAT);
char[] sampleFormat = null;
if (sampleFormatField != null) {
sampleFormat = sampleFormatField.getAsChars();
// Check that all the samples have the same format
for (int l=1; l<sampleFormat.length; l++) {
if (sampleFormat[l] != sampleFormat[0]) {
throw new RuntimeException(
JaiI18N.getString("TIFFImage2"));
}
}
} else {
sampleFormat = new char[] {1};
}
// Set the data type based on the sample size and format.
boolean isValidDataFormat = false;
switch(sampleSize) {
case 1:
case 4:
case 8:
if(sampleFormat[0] != 3) {
// Ignore whether signed or unsigned: treat all as unsigned.
dataType = DataBuffer.TYPE_BYTE;
isValidDataFormat = true;
}
break;
case 16:
if(sampleFormat[0] != 3) {
dataType = sampleFormat[0] == 2 ?
DataBuffer.TYPE_SHORT : DataBuffer.TYPE_USHORT;
isValidDataFormat = true;
}
break;
case 32:
dataType = sampleFormat[0] == 3 ?
DataBuffer.TYPE_FLOAT : DataBuffer.TYPE_INT;
isValidDataFormat = true;
break;
}
if(!isValidDataFormat) {
throw new RuntimeException(JaiI18N.getString("TIFFImage3"));
}
// Figure out what compression if any, is being used.
TIFFField compField = dir.getField(TIFFImageDecoder.TIFF_COMPRESSION);
compression = compField == null ? COMP_NONE : compField.getAsInt(0);
// Get the photometric interpretation.
TIFFField photoInterpField =
getField(dir,
TIFFImageDecoder.TIFF_PHOTOMETRIC_INTERPRETATION,
"Photometric Interpretation");
int photometricType = (int)photoInterpField.getAsLong(0);
// Determine which kind of image we are dealing with.
imageType = TYPE_UNSUPPORTED;
switch(photometricType) {
case 0: // WhiteIsZero
isWhiteZero = true;
case 1: // BlackIsZero
if(sampleSize == 1 && samplesPerPixel == 1) {
imageType = TYPE_BILEVEL;
} else if(sampleSize == 4 && samplesPerPixel == 1) {
imageType = TYPE_GRAY_4BIT;
} else if(sampleSize % 8 == 0) {
if(samplesPerPixel == 1) {
imageType = TYPE_GRAY;
} else if(samplesPerPixel == 2) {
imageType = TYPE_GRAY_ALPHA;
} else {
imageType = TYPE_GENERIC;
}
}
break;
case 2: // RGB
if(sampleSize % 8 == 0) {
if(samplesPerPixel == 3) {
imageType = TYPE_RGB;
} else if(samplesPerPixel == 4) {
imageType = TYPE_RGB_ALPHA;
} else {
imageType = TYPE_GENERIC;
}
}
break;
case 3: // RGB Palette
if(samplesPerPixel == 1 &&
(sampleSize == 4 || sampleSize == 8 || sampleSize == 16)) {
imageType = TYPE_PALETTE;
}
break;
case 4: // Transparency mask
if(sampleSize == 1 && samplesPerPixel == 1) {
imageType = TYPE_BILEVEL;
}
break;
case 6: // YCbCr
if(compression == COMP_JPEG_TTN2 &&
sampleSize == 8 && samplesPerPixel == 3) {
// Set color conversion flag.
colorConvertJPEG = param.getJPEGDecompressYCbCrToRGB();
// Set type to RGB if color converting.
imageType = colorConvertJPEG ? TYPE_RGB : TYPE_GENERIC;
} else {
TIFFField chromaField = dir.getField(TIFF_YCBCR_SUBSAMPLING);
if(chromaField != null) {
chromaSubH = chromaField.getAsInt(0);
chromaSubV = chromaField.getAsInt(1);
} else {
chromaSubH = chromaSubV = 2;
}
if(chromaSubH*chromaSubV == 1) {
imageType = TYPE_GENERIC;
} else if(sampleSize == 8 && samplesPerPixel == 3) {
imageType = TYPE_YCBCR_SUB;
}
}
break;
default: // Other including CMYK, CIE L*a*b*, unknown.
if(sampleSize % 8 == 0) {
imageType = TYPE_GENERIC;
}
}
// Bail out if not one of the supported types.
if(imageType == TYPE_UNSUPPORTED) {
throw new RuntimeException(JaiI18N.getString("TIFFImage4"));
}
// Set basic image layout
minX = minY = 0;
width = (int)(getField(dir,
TIFFImageDecoder.TIFF_IMAGE_WIDTH,
"Image Width").getAsLong(0));
height = (int)(getField(dir,
TIFFImageDecoder.TIFF_IMAGE_LENGTH,
"Image Length").getAsLong(0));
// Set a preliminary band count. This may be changed later as needed.
numBands = samplesPerPixel;
// Figure out if any extra samples are present.
TIFFField efield = dir.getField(TIFFImageDecoder.TIFF_EXTRA_SAMPLES);
int extraSamples = efield == null ? 0 : (int)efield.getAsLong(0);
if (dir.getField(TIFFImageDecoder.TIFF_TILE_OFFSETS) != null) {
// Image is in tiled format
isTiled = true;
tileWidth = (int)(getField(dir,
TIFFImageDecoder.TIFF_TILE_WIDTH,
"Tile Width").getAsLong(0));
tileHeight = (int)(getField(dir,
TIFFImageDecoder.TIFF_TILE_LENGTH,
"Tile Length").getAsLong(0));
tileOffsets =
(getField(dir,
TIFFImageDecoder.TIFF_TILE_OFFSETS,
"Tile Offsets")).getAsLongs();
tileByteCounts = getFieldAsLongs(
getField(dir,
TIFFImageDecoder.TIFF_TILE_BYTE_COUNTS,
"Tile Byte Counts"));
} else {
// Image is in stripped format, looks like tiles to us
isTiled = false;
// Note: Some legacy files may have tile width and height
// written but use the strip offsets and byte counts fields
// instead of the tile offsets and byte counts. Therefore
// we default here to the tile dimensions if they are written.
tileWidth =
dir.getField(TIFFImageDecoder.TIFF_TILE_WIDTH) != null ?
(int)dir.getFieldAsLong(TIFFImageDecoder.TIFF_TILE_WIDTH) :
width;
TIFFField field =
dir.getField(TIFFImageDecoder.TIFF_ROWS_PER_STRIP);
if (field == null) {
// Default is infinity (2^32 -1), basically the entire image
tileHeight =
dir.getField(TIFFImageDecoder.TIFF_TILE_LENGTH) != null ?
(int)dir.getFieldAsLong(TIFFImageDecoder.TIFF_TILE_LENGTH):
height;
} else {
long l = field.getAsLong(0);
long infinity = 1;
infinity = (infinity << 32) - 1;
if (l == infinity) {
// 2^32 - 1 (effectively infinity, entire image is 1 strip)
tileHeight = height;
} else {
tileHeight = (int)l;
}
}
TIFFField tileOffsetsField =
getField(dir,
TIFFImageDecoder.TIFF_STRIP_OFFSETS,
"Strip Offsets");
tileOffsets = getFieldAsLongs(tileOffsetsField);
TIFFField tileByteCountsField =
getField(dir,
TIFFImageDecoder.TIFF_STRIP_BYTE_COUNTS,
"Strip Byte Counts");
tileByteCounts = getFieldAsLongs(tileByteCountsField);
// Uncompressed image provided in a single tile: clamp to max bytes.
int maxBytes = width*height*numBands*((sampleSize + 7)/8);
if(tileByteCounts.length == 1 &&
compression == COMP_NONE &&
tileByteCounts[0] > maxBytes) {
tileByteCounts[0] = maxBytes;
}
}
// Calculate number of tiles and the tileSize in bytes
tilesX = (width + tileWidth - 1)/tileWidth;
tilesY = (height + tileHeight - 1)/tileHeight;
tileSize = tileWidth * tileHeight * numBands;
// Check whether big endian or little endian format is used.
isBigEndian = dir.isBigEndian();
TIFFField fillOrderField =
dir.getField(TIFFImageDecoder.TIFF_FILL_ORDER);
if (fillOrderField != null) {
fillOrder = fillOrderField.getAsInt(0);
} else {
// Default Fill Order
fillOrder = 1;
}
switch(compression) {
case COMP_NONE:
case COMP_PACKBITS:
// Do nothing.
break;
case COMP_DEFLATE:
inflater = new Inflater();
break;
case COMP_FAX_G3_1D:
case COMP_FAX_G3_2D:
case COMP_FAX_G4_2D:
if(sampleSize != 1) {
throw new RuntimeException(JaiI18N.getString("TIFFImage7"));
}
// Fax T.4 compression options
if (compression == 3) {
TIFFField t4OptionsField =
dir.getField(TIFFImageDecoder.TIFF_T4_OPTIONS);
if (t4OptionsField != null) {
tiffT4Options = t4OptionsField.getAsLong(0);
} else {
// Use default value
tiffT4Options = 0;
}
}
// Fax T.6 compression options
if (compression == 4) {
TIFFField t6OptionsField =
dir.getField(TIFFImageDecoder.TIFF_T6_OPTIONS);
if (t6OptionsField != null) {
tiffT6Options = t6OptionsField.getAsLong(0);
} else {
// Use default value
tiffT6Options = 0;
}
}
// Fax encoding, need to create the Fax decoder.
decoder = new TIFFFaxDecoder(fillOrder,
tileWidth, tileHeight);
break;
case COMP_LZW:
// LZW compression used, need to create the LZW decoder.
TIFFField predictorField =
dir.getField(TIFFImageDecoder.TIFF_PREDICTOR);
if (predictorField == null) {
predictor = 1;
} else {
predictor = predictorField.getAsInt(0);
if (predictor != 1 && predictor != 2) {
throw new RuntimeException(JaiI18N.getString("TIFFImage8"));
}
if (predictor == 2 && sampleSize != 8) {
throw new RuntimeException(sampleSize +
JaiI18N.getString("TIFFImage9"));
}
}
lzwDecoder = new TIFFLZWDecoder(tileWidth, predictor,
samplesPerPixel);
break;
case COMP_JPEG_OLD:
throw new RuntimeException(JaiI18N.getString("TIFFImage15"));
case COMP_JPEG_TTN2:
if(!(sampleSize == 8 &&
((imageType == TYPE_GRAY && samplesPerPixel == 1) ||
(imageType == TYPE_PALETTE && samplesPerPixel == 1) ||
(imageType == TYPE_RGB && samplesPerPixel == 3)))) {
throw new RuntimeException(JaiI18N.getString("TIFFImage16"));
}
// Create decodeParam from JPEGTables field if present.
if(dir.isTagPresent(TIFF_JPEG_TABLES)) {
TIFFField jpegTableField = dir.getField(TIFF_JPEG_TABLES);
byte[] jpegTable = jpegTableField.getAsBytes();
ByteArrayInputStream tableStream =
new ByteArrayInputStream(jpegTable);
JPEGImageDecoder decoder =
JPEGCodec.createJPEGDecoder(tableStream);
decoder.decodeAsRaster();
decodeParam = decoder.getJPEGDecodeParam();
}
break;
default:
throw new RuntimeException(JaiI18N.getString("TIFFImage10"));
}
switch(imageType) {
case TYPE_BILEVEL:
case TYPE_GRAY_4BIT:
sampleModel =
new MultiPixelPackedSampleModel(dataType,
tileWidth,
tileHeight,
sampleSize);
if(imageType == TYPE_BILEVEL) {
byte[] map = new byte[] {(byte)(isWhiteZero ? 255 : 0),
(byte)(isWhiteZero ? 0 : 255)};
colorModel = new IndexColorModel(1, 2, map, map, map);
} else {
colorModel =
ImageCodec.createGrayIndexColorModel(sampleModel,
!isWhiteZero);
}
break;
case TYPE_GRAY:
case TYPE_GRAY_ALPHA:
case TYPE_RGB:
case TYPE_RGB_ALPHA:
// Create a pixel interleaved SampleModel with decreasing
// band offsets.
int[] RGBOffsets = new int[numBands];
if(compression == COMP_JPEG_TTN2) {
for (int i=0; i<numBands; i++) {
RGBOffsets[i] = numBands - 1 - i;
}
} else {
for (int i=0; i<numBands; i++) {
RGBOffsets[i] = i;
}
}
sampleModel = createPixelInterleavedSampleModel(dataType,
tileWidth,
tileHeight,
numBands,
numBands*tileWidth,
RGBOffsets);
if(imageType == TYPE_GRAY || imageType == TYPE_RGB) {
colorModel =
ImageCodec.createComponentColorModel(sampleModel);
} else { // hasAlpha
// Transparency.OPAQUE signifies image data that is
// completely opaque, meaning that all pixels have an alpha
// value of 1.0. So the extra band gets ignored, which is
// what we want.
int transparency = Transparency.OPAQUE;
if(extraSamples == 1) { // associated (premultiplied) alpha
transparency = Transparency.TRANSLUCENT;
} else if(extraSamples == 2) { // unassociated alpha
transparency = Transparency.BITMASK;
}
colorModel =
createAlphaComponentColorModel(dataType,
numBands,
extraSamples == 1,
transparency);
}
break;
case TYPE_GENERIC:
case TYPE_YCBCR_SUB:
// For this case we can't display the image, so we create a
// SampleModel with increasing bandOffsets, and keep the
// ColorModel as null, as there is no appropriate ColorModel.
int[] bandOffsets = new int[numBands];
for (int i=0; i<numBands; i++) {
bandOffsets[i] = i;
}
sampleModel =
createPixelInterleavedSampleModel(dataType,
tileWidth, tileHeight,
numBands, numBands * tileWidth,
bandOffsets);
colorModel = null;
break;
case TYPE_PALETTE:
// Get the colormap
TIFFField cfield = getField(dir, TIFFImageDecoder.TIFF_COLORMAP,
"Colormap");
colormap = cfield.getAsChars();
// Could be either 1 or 3 bands depending on whether we use
// IndexColorModel or not.
if (decodePaletteAsShorts) {
numBands = 3;
// If no SampleFormat tag was specified and if the
// sampleSize is less than or equal to 8, then the
// dataType was initially set to byte, but now we want to
// expand the palette as shorts, so the dataType should
// be ushort.
if (dataType == DataBuffer.TYPE_BYTE) {
dataType = DataBuffer.TYPE_USHORT;
}
// Data will have to be unpacked into a 3 band short image
// as we do not have a IndexColorModel that can deal with
// a colormodel whose entries are of short data type.
sampleModel =
RasterFactory.createPixelInterleavedSampleModel(dataType,
tileWidth,
tileHeight,
numBands);
colorModel = ImageCodec.createComponentColorModel(sampleModel);
} else {
numBands = 1;
if (sampleSize == 4) {
// Pixel data will not be unpacked, will use MPPSM to store
// packed data and IndexColorModel to do the unpacking.
sampleModel =
new MultiPixelPackedSampleModel(DataBuffer.TYPE_BYTE,
tileWidth,
tileHeight,
sampleSize);
} else if (sampleSize == 8) {
sampleModel =
RasterFactory.createPixelInterleavedSampleModel(
DataBuffer.TYPE_BYTE,
tileWidth,
tileHeight,
numBands);
} else if (sampleSize == 16) {
// Here datatype has to be unsigned since we are storing
// indices into the IndexColorModel palette. Ofcourse
// the actual palette entries are allowed to be negative.
dataType = DataBuffer.TYPE_USHORT;
sampleModel =
RasterFactory.createPixelInterleavedSampleModel(
DataBuffer.TYPE_USHORT,
tileWidth,
tileHeight,
numBands);
}
int bandLength = colormap.length/3;
byte r[] = new byte[bandLength];
byte g[] = new byte[bandLength];
byte b[] = new byte[bandLength];
int gIndex = bandLength;
int bIndex = bandLength * 2;
if (dataType == DataBuffer.TYPE_SHORT) {
for (int i=0; i<bandLength; i++) {
r[i] = param.decodeSigned16BitsTo8Bits(
(short)colormap[i]);
g[i] = param.decodeSigned16BitsTo8Bits(
(short)colormap[gIndex+i]);
b[i] = param.decodeSigned16BitsTo8Bits(
(short)colormap[bIndex+i]);
}
} else {
for (int i=0; i<bandLength; i++) {
r[i] = param.decode16BitsTo8Bits(colormap[i] & 0xffff);
g[i] = param.decode16BitsTo8Bits(colormap[gIndex+i] &
0xffff);
b[i] = param.decode16BitsTo8Bits(colormap[bIndex+i] &
0xffff);
}
}
colorModel = new IndexColorModel(sampleSize,
bandLength, r, g, b);
}
break;
default:
throw new RuntimeException("TIFFImage4");
}
}
/**
* Reads a private IFD from a given offset in the stream. This
* method may be used to obtain IFDs that are referenced
* only by private tag values.
*/
public TIFFDirectory getPrivateIFD(long offset) throws IOException {
return new TIFFDirectory(stream, offset, 0);
}
/**
* Returns tile (tileX, tileY) as a Raster.
*/
public synchronized Raster getTile(int tileX, int tileY) {
if ((tileX < 0) || (tileX >= tilesX) ||
(tileY < 0) || (tileY >= tilesY)) {
throw new IllegalArgumentException(JaiI18N.getString("TIFFImage12"));
}
// Get the data array out of the DataBuffer
byte bdata[] = null;
short sdata[] = null;
int idata[] = null;
float fdata[] = null;
DataBuffer buffer = sampleModel.createDataBuffer();
int dataType = sampleModel.getDataType();
if (dataType == DataBuffer.TYPE_BYTE) {
bdata = ((DataBufferByte)buffer).getData();
} else if (dataType == DataBuffer.TYPE_USHORT) {
sdata = ((DataBufferUShort)buffer).getData();
} else if (dataType == DataBuffer.TYPE_SHORT) {
sdata = ((DataBufferShort)buffer).getData();
} else if (dataType == DataBuffer.TYPE_INT) {
idata = ((DataBufferInt)buffer).getData();
} else if (dataType == DataBuffer.TYPE_FLOAT) {
if(buffer instanceof DataBufferFloat) {
fdata = ((DataBufferFloat)buffer).getData();
} else {
// This is a hack to make this work with JAI which in some
// cases downcasts the DataBuffer to a type-specific class.
// In the case of float data this current means the JAI class
// javax.media.jai.DataBufferFloat.
try {
Method getDataMethod =
buffer.getClass().getMethod("getData", null);
fdata = (float[])getDataMethod.invoke(buffer, null);
} catch(Exception e) {
throw new RuntimeException(JaiI18N.getString("TIFFImage18"));
}
}
}
WritableRaster tile =
(WritableRaster)RasterFactory.createWritableRaster(sampleModel,
buffer,
new Point(tileXToX(tileX),
tileYToY(tileY)));
// Save original file pointer position and seek to tile data location.
long save_offset = 0;
try {
save_offset = stream.getFilePointer();
stream.seek(tileOffsets[tileY*tilesX + tileX]);
} catch (IOException ioe) {
throw new RuntimeException(JaiI18N.getString("TIFFImage13"));
}
// Number of bytes in this tile (strip) after compression.
int byteCount = (int)tileByteCounts[tileY*tilesX + tileX];
// Find out the number of bytes in the current tile. If the image is
// tiled this may include pixels which are outside of the image bounds
// if the image width and height are not multiples of the tile width
// and height respectively.
Rectangle tileRect = new Rectangle(tileXToX(tileX), tileYToY(tileY),
tileWidth, tileHeight);
Rectangle newRect = isTiled ?
tileRect : tileRect.intersection(getBounds());
int unitsInThisTile = newRect.width * newRect.height * numBands;
// Allocate read buffer if needed.
byte data[] = compression != COMP_NONE || imageType == TYPE_PALETTE ?
new byte[byteCount] : null;
// Read the data, uncompressing as needed. There are four cases:
// bilevel, palette-RGB, 4-bit grayscale, and everything else.
if(imageType == TYPE_BILEVEL) { // bilevel
try {
if (compression == COMP_PACKBITS) {
stream.readFully(data, 0, byteCount);
// Since the decompressed data will still be packed
// 8 pixels into 1 byte, calculate bytesInThisTile
int bytesInThisTile;
if ((newRect.width % 8) == 0) {
bytesInThisTile = (newRect.width/8) * newRect.height;
} else {
bytesInThisTile =
(newRect.width/8 + 1) * newRect.height;
}
decodePackbits(data, bytesInThisTile, bdata);
} else if (compression == COMP_LZW) {
stream.readFully(data, 0, byteCount);
lzwDecoder.decode(data, bdata, newRect.height);
} else if (compression == COMP_FAX_G3_1D) {
stream.readFully(data, 0, byteCount);
decoder.decode1D(bdata, data, 0, newRect.height);
} else if (compression == COMP_FAX_G3_2D) {
stream.readFully(data, 0, byteCount);
decoder.decode2D(bdata, data, 0, newRect.height,
tiffT4Options);
} else if (compression == COMP_FAX_G4_2D) {
stream.readFully(data, 0, byteCount);
decoder.decodeT6(bdata, data, 0, newRect.height,
tiffT6Options);
} else if (compression == COMP_DEFLATE) {
stream.readFully(data, 0, byteCount);
inflate(data, bdata);
} else if (compression == COMP_NONE) {
stream.readFully(bdata, 0, byteCount);
}
stream.seek(save_offset);
} catch (IOException ioe) {
throw new RuntimeException(JaiI18N.getString("TIFFImage13"));
}
} else if(imageType == TYPE_PALETTE) { // palette-RGB
if (sampleSize == 16) {
if (decodePaletteAsShorts) {
short tempData[]= null;
// At this point the data is 1 banded and will
// become 3 banded only after we've done the palette
// lookup, since unitsInThisTile was calculated with
// 3 bands, we need to divide this by 3.
int unitsBeforeLookup = unitsInThisTile / 3;
// Since unitsBeforeLookup is the number of shorts,
// but we do our decompression in terms of bytes, we
// need to multiply it by 2 in order to figure out
// how many bytes we'll get after decompression.
int entries = unitsBeforeLookup * 2;
// Read the data, if compressed, decode it, reset the pointer
try {
if (compression == COMP_PACKBITS) {
stream.readFully(data, 0, byteCount);
byte byteArray[] = new byte[entries];
decodePackbits(data, entries, byteArray);
tempData = new short[unitsBeforeLookup];
interpretBytesAsShorts(byteArray, tempData,
unitsBeforeLookup);
} else if (compression == COMP_LZW) {
// Read in all the compressed data for this tile
stream.readFully(data, 0, byteCount);
byte byteArray[] = new byte[entries];
lzwDecoder.decode(data, byteArray, newRect.height);
tempData = new short[unitsBeforeLookup];
interpretBytesAsShorts(byteArray, tempData,
unitsBeforeLookup);
} else if (compression == COMP_DEFLATE) {
stream.readFully(data, 0, byteCount);
byte byteArray[] = new byte[entries];
inflate(data, byteArray);
tempData = new short[unitsBeforeLookup];
interpretBytesAsShorts(byteArray, tempData,
unitsBeforeLookup);
} else if (compression == COMP_NONE) {
// byteCount tells us how many bytes are there
// in this tile, but we need to read in shorts,
// which will take half the space, so while
// allocating we divide byteCount by 2.
tempData = new short[byteCount/2];
readShorts(byteCount/2, tempData);
}
stream.seek(save_offset);
} catch (IOException ioe) {
throw new RuntimeException(
JaiI18N.getString("TIFFImage13"));
}
if (dataType == DataBuffer.TYPE_USHORT) {
// Expand the palette image into an rgb image with ushort
// data type.
int cmapValue;
int count = 0, lookup, len = colormap.length/3;
int len2 = len * 2;
for (int i=0; i<unitsBeforeLookup; i++) {
// Get the index into the colormap
lookup = tempData[i] & 0xffff;
// Get the blue value
cmapValue = colormap[lookup+len2];
sdata[count++] = (short)(cmapValue & 0xffff);
// Get the green value
cmapValue = colormap[lookup+len];
sdata[count++] = (short)(cmapValue & 0xffff);
// Get the red value
cmapValue = colormap[lookup];
sdata[count++] = (short)(cmapValue & 0xffff);
}
} else if (dataType == DataBuffer.TYPE_SHORT) {
// Expand the palette image into an rgb image with
// short data type.
int cmapValue;
int count = 0, lookup, len = colormap.length/3;
int len2 = len * 2;
for (int i=0; i<unitsBeforeLookup; i++) {
// Get the index into the colormap
lookup = tempData[i] & 0xffff;
// Get the blue value
cmapValue = colormap[lookup+len2];
sdata[count++] = (short)cmapValue;
// Get the green value
cmapValue = colormap[lookup+len];
sdata[count++] = (short)cmapValue;
// Get the red value
cmapValue = colormap[lookup];
sdata[count++] = (short)cmapValue;
}
}
} else {
// No lookup being done here, when RGB values are needed,
// the associated IndexColorModel can be used to get them.
try {
if (compression == COMP_PACKBITS) {
stream.readFully(data, 0, byteCount);
// Since unitsInThisTile is the number of shorts,
// but we do our decompression in terms of bytes, we
// need to multiply unitsInThisTile by 2 in order to
// figure out how many bytes we'll get after
// decompression.
int bytesInThisTile = unitsInThisTile * 2;
byte byteArray[] = new byte[bytesInThisTile];
decodePackbits(data, bytesInThisTile, byteArray);
interpretBytesAsShorts(byteArray, sdata,
unitsInThisTile);
} else if (compression == COMP_LZW) {
stream.readFully(data, 0, byteCount);
// Since unitsInThisTile is the number of shorts,
// but we do our decompression in terms of bytes, we
// need to multiply unitsInThisTile by 2 in order to
// figure out how many bytes we'll get after
// decompression.
byte byteArray[] = new byte[unitsInThisTile * 2];
lzwDecoder.decode(data, byteArray, newRect.height);
interpretBytesAsShorts(byteArray, sdata,
unitsInThisTile);
} else if (compression == COMP_DEFLATE) {
stream.readFully(data, 0, byteCount);
byte byteArray[] = new byte[unitsInThisTile * 2];
inflate(data, byteArray);
interpretBytesAsShorts(byteArray, sdata,
unitsInThisTile);
} else if (compression == COMP_NONE) {
readShorts(byteCount/2, sdata);
}
stream.seek(save_offset);
} catch (IOException ioe) {
throw new RuntimeException(
JaiI18N.getString("TIFFImage13"));
}
}
} else if (sampleSize == 8) {
if (decodePaletteAsShorts) {
byte tempData[]= null;
// At this point the data is 1 banded and will
// become 3 banded only after we've done the palette
// lookup, since unitsInThisTile was calculated with
// 3 bands, we need to divide this by 3.
int unitsBeforeLookup = unitsInThisTile / 3;
// Read the data, if compressed, decode it, reset the pointer
try {
if (compression == COMP_PACKBITS) {
stream.readFully(data, 0, byteCount);
tempData = new byte[unitsBeforeLookup];
decodePackbits(data, unitsBeforeLookup, tempData);
} else if (compression == COMP_LZW) {
stream.readFully(data, 0, byteCount);
tempData = new byte[unitsBeforeLookup];
lzwDecoder.decode(data, tempData, newRect.height);
} else if (compression == COMP_JPEG_TTN2) {
stream.readFully(data, 0, byteCount);
Raster tempTile = decodeJPEG(data,
decodeParam,
colorConvertJPEG,
tile.getMinX(),
tile.getMinY());
int[] tempPixels = new int[unitsBeforeLookup];
tempTile.getPixels(tile.getMinX(),
tile.getMinY(),
tile.getWidth(),
tile.getHeight(),
tempPixels);
tempData = new byte[unitsBeforeLookup];
for(int i = 0; i < unitsBeforeLookup; i++) {
tempData[i] = (byte)tempPixels[i];
}
} else if (compression == COMP_DEFLATE) {
stream.readFully(data, 0, byteCount);
tempData = new byte[unitsBeforeLookup];
inflate(data, tempData);
} else if (compression == COMP_NONE) {
tempData = new byte[byteCount];
stream.readFully(tempData, 0, byteCount);
}
stream.seek(save_offset);
} catch (IOException ioe) {
throw new RuntimeException(
JaiI18N.getString("TIFFImage13"));
}
// Expand the palette image into an rgb image with ushort
// data type.
int cmapValue;
int count = 0, lookup, len = colormap.length/3;
int len2 = len * 2;
for (int i=0; i<unitsBeforeLookup; i++) {
// Get the index into the colormap
lookup = tempData[i] & 0xff;
// Get the blue value
cmapValue = colormap[lookup+len2];
sdata[count++] = (short)(cmapValue & 0xffff);
// Get the green value
cmapValue = colormap[lookup+len];
sdata[count++] = (short)(cmapValue & 0xffff);
// Get the red value
cmapValue = colormap[lookup];
sdata[count++] = (short)(cmapValue & 0xffff);
}
} else {
// No lookup being done here, when RGB values are needed,
// the associated IndexColorModel can be used to get them.
try {
if (compression == COMP_PACKBITS) {
stream.readFully(data, 0, byteCount);
decodePackbits(data, unitsInThisTile, bdata);
} else if (compression == COMP_LZW) {
stream.readFully(data, 0, byteCount);
lzwDecoder.decode(data, bdata, newRect.height);
} else if (compression == COMP_JPEG_TTN2) {
stream.readFully(data, 0, byteCount);
tile.setRect(decodeJPEG(data,
decodeParam,
colorConvertJPEG,
tile.getMinX(),
tile.getMinY()));
} else if (compression == COMP_DEFLATE) {
stream.readFully(data, 0, byteCount);
inflate(data, bdata);
} else if (compression == COMP_NONE) {
stream.readFully(bdata, 0, byteCount);
}
stream.seek(save_offset);
} catch (IOException ioe) {
throw new RuntimeException(
JaiI18N.getString("TIFFImage13"));
}
}
} else if (sampleSize == 4) {
int padding = (newRect.width % 2 == 0) ? 0 : 1;
int bytesPostDecoding = ((newRect.width/2 + padding) *
newRect.height);
// Output short images
if (decodePaletteAsShorts) {
byte tempData[] = null;
try {
stream.readFully(data, 0, byteCount);
stream.seek(save_offset);
} catch (IOException ioe) {
throw new RuntimeException(
JaiI18N.getString("TIFFImage13"));
}
// If compressed, decode the data.
if (compression == COMP_PACKBITS) {
tempData = new byte[bytesPostDecoding];
decodePackbits(data, bytesPostDecoding, tempData);
} else if (compression == COMP_LZW) {
tempData = new byte[bytesPostDecoding];
lzwDecoder.decode(data, tempData, newRect.height);
} else if (compression == COMP_DEFLATE) {
tempData = new byte[bytesPostDecoding];
inflate(data, tempData);
} else if (compression == COMP_NONE) {
tempData = data;
}
int bytes = unitsInThisTile / 3;
// Unpack the 2 pixels packed into each byte.
data = new byte[bytes];
int srcCount = 0, dstCount = 0;
for (int j=0; j<newRect.height; j++) {
for (int i=0; i<newRect.width/2; i++) {
data[dstCount++] =
(byte)((tempData[srcCount] & 0xf0) >> 4);
data[dstCount++] =
(byte)(tempData[srcCount++] & 0x0f);
}
if (padding == 1) {
data[dstCount++] =
(byte)((tempData[srcCount++] & 0xf0) >> 4);
}
}
int len = colormap.length/3;
int len2 = len*2;
int cmapValue, lookup;
int count = 0;
for (int i=0; i<bytes; i++) {
lookup = data[i] & 0xff;
cmapValue = colormap[lookup+len2];
sdata[count++] = (short)(cmapValue & 0xffff);
cmapValue = colormap[lookup+len];
sdata[count++] = (short)(cmapValue & 0xffff);
cmapValue = colormap[lookup];
sdata[count++] = (short)(cmapValue & 0xffff);
}
} else {
// Output byte values, use IndexColorModel for unpacking
try {
// If compressed, decode the data.
if (compression == COMP_PACKBITS) {
stream.readFully(data, 0, byteCount);
decodePackbits(data, bytesPostDecoding, bdata);
} else if (compression == COMP_LZW) {
stream.readFully(data, 0, byteCount);
lzwDecoder.decode(data, bdata, newRect.height);
} else if (compression == COMP_DEFLATE) {
stream.readFully(data, 0, byteCount);
inflate(data, bdata);
} else if (compression == COMP_NONE) {
stream.readFully(bdata, 0, byteCount);
}
stream.seek(save_offset);
} catch (IOException ioe) {
throw new RuntimeException(
JaiI18N.getString("TIFFImage13"));
}
}
}
} else if(imageType == TYPE_GRAY_4BIT) { // 4-bit gray
try {
if (compression == COMP_PACKBITS) {
stream.readFully(data, 0, byteCount);
// Since the decompressed data will still be packed
// 2 pixels into 1 byte, calculate bytesInThisTile
int bytesInThisTile;
if ((newRect.width % 8) == 0) {
bytesInThisTile = (newRect.width/2) * newRect.height;
} else {
bytesInThisTile = (newRect.width/2 + 1) *
newRect.height;
}
decodePackbits(data, bytesInThisTile, bdata);
} else if (compression == COMP_LZW) {
stream.readFully(data, 0, byteCount);
lzwDecoder.decode(data, bdata, newRect.height);
} else if (compression == COMP_DEFLATE) {
stream.readFully(data, 0, byteCount);
inflate(data, bdata);
} else {
stream.readFully(bdata, 0, byteCount);
}
stream.seek(save_offset);
} catch (IOException ioe) {
throw new RuntimeException(JaiI18N.getString("TIFFImage13"));
}
} else { // everything else
try {
if (sampleSize == 8) {
if (compression == COMP_NONE) {
stream.readFully(bdata, 0, byteCount);
} else if (compression == COMP_LZW) {
stream.readFully(data, 0, byteCount);
lzwDecoder.decode(data, bdata, newRect.height);
} else if (compression == COMP_PACKBITS) {
stream.readFully(data, 0, byteCount);
decodePackbits(data, unitsInThisTile, bdata);
} else if (compression == COMP_JPEG_TTN2) {
stream.readFully(data, 0, byteCount);
tile.setRect(decodeJPEG(data,
decodeParam,
colorConvertJPEG,
tile.getMinX(),
tile.getMinY()));
} else if (compression == COMP_DEFLATE) {
stream.readFully(data, 0, byteCount);
inflate(data, bdata);
}
} else if (sampleSize == 16) {
if (compression == COMP_NONE) {
readShorts(byteCount/2, sdata);
} else if (compression == COMP_LZW) {
stream.readFully(data, 0, byteCount);
// Since unitsInThisTile is the number of shorts,
// but we do our decompression in terms of bytes, we
// need to multiply unitsInThisTile by 2 in order to
// figure out how many bytes we'll get after
// decompression.
byte byteArray[] = new byte[unitsInThisTile * 2];
lzwDecoder.decode(data, byteArray, newRect.height);
interpretBytesAsShorts(byteArray, sdata,
unitsInThisTile);
} else if (compression == COMP_PACKBITS) {
stream.readFully(data, 0, byteCount);
// Since unitsInThisTile is the number of shorts,
// but we do our decompression in terms of bytes, we
// need to multiply unitsInThisTile by 2 in order to
// figure out how many bytes we'll get after
// decompression.
int bytesInThisTile = unitsInThisTile * 2;
byte byteArray[] = new byte[bytesInThisTile];
decodePackbits(data, bytesInThisTile, byteArray);
interpretBytesAsShorts(byteArray, sdata,
unitsInThisTile);
} else if (compression == COMP_DEFLATE) {
stream.readFully(data, 0, byteCount);
byte byteArray[] = new byte[unitsInThisTile * 2];
inflate(data, byteArray);
interpretBytesAsShorts(byteArray, sdata,
unitsInThisTile);
}
} else if (sampleSize == 32 &&
dataType == DataBuffer.TYPE_INT) { // redundant
if (compression == COMP_NONE) {
readInts(byteCount/4, idata);
} else if (compression == COMP_LZW) {
stream.readFully(data, 0, byteCount);
// Since unitsInThisTile is the number of ints,
// but we do our decompression in terms of bytes, we
// need to multiply unitsInThisTile by 4 in order to
// figure out how many bytes we'll get after
// decompression.
byte byteArray[] = new byte[unitsInThisTile * 4];
lzwDecoder.decode(data, byteArray, newRect.height);
interpretBytesAsInts(byteArray, idata,
unitsInThisTile);
} else if (compression == COMP_PACKBITS) {
stream.readFully(data, 0, byteCount);
// Since unitsInThisTile is the number of ints,
// but we do our decompression in terms of bytes, we
// need to multiply unitsInThisTile by 4 in order to
// figure out how many bytes we'll get after
// decompression.
int bytesInThisTile = unitsInThisTile * 4;
byte byteArray[] = new byte[bytesInThisTile];
decodePackbits(data, bytesInThisTile, byteArray);
interpretBytesAsInts(byteArray, idata,
unitsInThisTile);
} else if (compression == COMP_DEFLATE) {
stream.readFully(data, 0, byteCount);
byte byteArray[] = new byte[unitsInThisTile * 4];
inflate(data, byteArray);
interpretBytesAsInts(byteArray, idata,
unitsInThisTile);
}
} else if (sampleSize == 32 &&
dataType == DataBuffer.TYPE_FLOAT) { // redundant
if (compression == COMP_NONE) {
readFloats(byteCount/4, fdata);
} else if (compression == COMP_LZW) {
stream.readFully(data, 0, byteCount);
// Since unitsInThisTile is the number of floats,
// but we do our decompression in terms of bytes, we
// need to multiply unitsInThisTile by 4 in order to
// figure out how many bytes we'll get after
// decompression.
byte byteArray[] = new byte[unitsInThisTile * 4];
lzwDecoder.decode(data, byteArray, newRect.height);
interpretBytesAsFloats(byteArray, fdata,
unitsInThisTile);
} else if (compression == COMP_PACKBITS) {
stream.readFully(data, 0, byteCount);
// Since unitsInThisTile is the number of floats,
// but we do our decompression in terms of bytes, we
// need to multiply unitsInThisTile by 4 in order to
// figure out how many bytes we'll get after
// decompression.
int bytesInThisTile = unitsInThisTile * 4;
byte byteArray[] = new byte[bytesInThisTile];
decodePackbits(data, bytesInThisTile, byteArray);
interpretBytesAsFloats(byteArray, fdata,
unitsInThisTile);
} else if (compression == COMP_DEFLATE) {
stream.readFully(data, 0, byteCount);
byte byteArray[] = new byte[unitsInThisTile * 4];
inflate(data, byteArray);
interpretBytesAsFloats(byteArray, fdata,
unitsInThisTile);
}
}
stream.seek(save_offset);
} catch (IOException ioe) {
throw new RuntimeException(JaiI18N.getString("TIFFImage13"));
}
// Modify the data for certain special cases.
switch(imageType) {
case TYPE_GRAY:
case TYPE_GRAY_ALPHA:
if(isWhiteZero) {
// Since we are using a ComponentColorModel with this
// image, we need to change the WhiteIsZero data to
// BlackIsZero data so it will display properly.
if (dataType == DataBuffer.TYPE_BYTE &&
!(colorModel instanceof IndexColorModel)) {
for (int l = 0; l < bdata.length; l += numBands) {
bdata[l] = (byte)(255 - bdata[l]);
}
} else if (dataType == DataBuffer.TYPE_USHORT) {
int ushortMax = Short.MAX_VALUE - Short.MIN_VALUE;
for (int l = 0; l < sdata.length; l += numBands) {
sdata[l] = (short)(ushortMax - sdata[l]);
}
} else if (dataType == DataBuffer.TYPE_SHORT) {
for (int l = 0; l < sdata.length; l += numBands) {
sdata[l] = (short)(~sdata[l]);
}
} else if (dataType == DataBuffer.TYPE_INT) {
long uintMax = Integer.MAX_VALUE - Integer.MIN_VALUE;
for (int l = 0; l < idata.length; l += numBands) {
idata[l] = (int)(uintMax - (long)idata[l]);
}
}
}
break;
case TYPE_YCBCR_SUB:
// Post-processing for YCbCr with subsampled chrominance:
// simply replicate the chroma channels for displayability.
int pixelsPerDataUnit = chromaSubH*chromaSubV;
int numH = newRect.width/chromaSubH;
int numV = newRect.height/chromaSubV;
byte[] tempData = new byte[numH*numV*(pixelsPerDataUnit + 2)];
System.arraycopy(bdata, 0, tempData, 0, tempData.length);
int samplesPerDataUnit = pixelsPerDataUnit*3;
int[] pixels = new int[samplesPerDataUnit];
int bOffset = 0;
int offsetCb = pixelsPerDataUnit;
int offsetCr = offsetCb + 1;
int y = newRect.y;
for(int j = 0; j < numV; j++) {
int x = newRect.x;
for(int i = 0; i < numH; i++) {
int Cb = tempData[bOffset + offsetCb];
int Cr = tempData[bOffset + offsetCr];
int k = 0;
while(k < samplesPerDataUnit) {
pixels[k++] = tempData[bOffset++];
pixels[k++] = Cb;
pixels[k++] = Cr;
}
bOffset += 2;
tile.setPixels(x, y, chromaSubH, chromaSubV, pixels);
x += chromaSubH;
}
y += chromaSubV;
}
break;
}
}
return tile;
}
private void readShorts(int shortCount, short shortArray[]) {
// Since each short consists of 2 bytes, we need a
// byte array of double size
int byteCount = 2 * shortCount;
byte byteArray[] = new byte[byteCount];
try {
stream.readFully(byteArray, 0, byteCount);
} catch (IOException ioe) {
throw new RuntimeException(JaiI18N.getString("TIFFImage13"));
}
interpretBytesAsShorts(byteArray, shortArray, shortCount);
}
private void readInts(int intCount, int intArray[]) {
// Since each int consists of 4 bytes, we need a
// byte array of quadruple size
int byteCount = 4 * intCount;
byte byteArray[] = new byte[byteCount];
try {
stream.readFully(byteArray, 0, byteCount);
} catch (IOException ioe) {
throw new RuntimeException(JaiI18N.getString("TIFFImage13"));
}
interpretBytesAsInts(byteArray, intArray, intCount);
}
private void readFloats(int floatCount, float floatArray[]) {
// Since each float consists of 4 bytes, we need a
// byte array of quadruple size
int byteCount = 4 * floatCount;
byte byteArray[] = new byte[byteCount];
try {
stream.readFully(byteArray, 0, byteCount);
} catch (IOException ioe) {
throw new RuntimeException(JaiI18N.getString("TIFFImage13"));
}
interpretBytesAsFloats(byteArray, floatArray, floatCount);
}
// Method to interpret a byte array to a short array, depending on
// whether the bytes are stored in a big endian or little endian format.
private void interpretBytesAsShorts(byte byteArray[],
short shortArray[],
int shortCount) {
int j = 0;
int firstByte, secondByte;
if (isBigEndian) {
for (int i=0; i<shortCount; i++) {
firstByte = byteArray[j++] & 0xff;
secondByte = byteArray[j++] & 0xff;
shortArray[i] = (short)((firstByte << 8) + secondByte);
}
} else {
for (int i=0; i<shortCount; i++) {
firstByte = byteArray[j++] & 0xff;
secondByte = byteArray[j++] & 0xff;
shortArray[i] = (short)((secondByte << 8) + firstByte);
}
}
}
// Method to interpret a byte array to a int array, depending on
// whether the bytes are stored in a big endian or little endian format.
private void interpretBytesAsInts(byte byteArray[],
int intArray[],
int intCount) {
int j = 0;
if (isBigEndian) {
for (int i=0; i<intCount; i++) {
intArray[i] =
(int)(((byteArray[j++] & 0xff) << 24) |
((byteArray[j++] & 0xff) << 16) |
((byteArray[j++] & 0xff) << 8) |
(byteArray[j++] & 0xff));
}
} else {
for (int i=0; i<intCount; i++) {
intArray[i] =
(int)((byteArray[j++] & 0xff) |
((byteArray[j++] & 0xff) << 8) |
((byteArray[j++] & 0xff) << 16) |
((byteArray[j++] & 0xff) << 24));
}
}
}
// Method to interpret a byte array to a float array, depending on
// whether the bytes are stored in a big endian or little endian format.
private void interpretBytesAsFloats(byte byteArray[],
float floatArray[],
int floatCount) {
int j = 0;
if (isBigEndian) {
for (int i=0; i<floatCount; i++) {
int value = (int)(((byteArray[j++] & 0xff) << 24) |
((byteArray[j++] & 0xff) << 16) |
((byteArray[j++] & 0xff) << 8) |
(byteArray[j++] & 0xff));
floatArray[i] = Float.intBitsToFloat(value);
}
} else {
for (int i=0; i<floatCount; i++) {
int value = (int)((byteArray[j++] & 0xff) |
((byteArray[j++] & 0xff) << 8) |
((byteArray[j++] & 0xff) << 16) |
((byteArray[j++] & 0xff) << 24));
floatArray[i] = Float.intBitsToFloat(value);
}
}
}
// Uncompress packbits compressed image data.
private byte[] decodePackbits(byte data[], int arraySize, byte[] dst) {
if (dst == null) {
dst = new byte[arraySize];
}
int srcCount = 0, dstCount = 0;
byte repeat, b;
try {
while (dstCount < arraySize) {
b = data[srcCount++];
if (b >= 0 && b <= 127) {
// literal run packet
for (int i=0; i<(b + 1); i++) {
dst[dstCount++] = data[srcCount++];
}
} else if (b <= -1 && b >= -127) {
// 2 byte encoded run packet
repeat = data[srcCount++];
for (int i=0; i<(-b + 1); i++) {
dst[dstCount++] = repeat;
}
} else {
// no-op packet. Do nothing
srcCount++;
}
}
} catch (java.lang.ArrayIndexOutOfBoundsException ae) {
throw new RuntimeException(JaiI18N.getString("TIFFImage14"));
}
return dst;
}
// Need a createColorModel().
// Create ComponentColorModel for TYPE_RGB images
private ComponentColorModel createAlphaComponentColorModel(
int dataType,
int numBands,
boolean isAlphaPremultiplied,
int transparency) {
ComponentColorModel ccm = null;
int RGBBits[] = null;
ColorSpace cs = null;
switch(numBands) {
case 2: // gray+alpha
cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);
break;
case 4: // RGB+alpha
cs = ColorSpace.getInstance(ColorSpace.CS_sRGB);
break;
default:
throw new IllegalArgumentException();
}
if(dataType == DataBuffer.TYPE_FLOAT) {
ccm = new FloatDoubleColorModel(cs,
true,
isAlphaPremultiplied,
transparency,
dataType);
} else { // all other types
int componentSize = 0;
switch(dataType) {
case DataBuffer.TYPE_BYTE:
componentSize = 8;
break;
case DataBuffer.TYPE_USHORT:
case DataBuffer.TYPE_SHORT:
componentSize = 16;
break;
case DataBuffer.TYPE_INT:
componentSize = 32;
break;
default:
throw new IllegalArgumentException();
}
RGBBits = new int[numBands];
for(int i = 0; i < numBands; i++) {
RGBBits[i] = componentSize;
}
ccm = new ComponentColorModel(cs,
RGBBits,
true,
isAlphaPremultiplied,
transparency,
dataType);
}
return ccm;
}
}