public BufferedImage read(int imageIndex, ImageReadParam param) throws IOException {
prepareRead(imageIndex, param);
this.theImage = getDestination(param, getImageTypes(imageIndex), width, height);
srcXSubsampling = imageReadParam.getSourceXSubsampling();
srcYSubsampling = imageReadParam.getSourceYSubsampling();
Point p = imageReadParam.getDestinationOffset();
dstXOffset = p.x;
dstYOffset = p.y;
// This could probably be made more efficient...
Rectangle srcRegion = new Rectangle(0, 0, 0, 0);
Rectangle destRegion = new Rectangle(0, 0, 0, 0);
computeRegions(imageReadParam, width, height, theImage, srcRegion, destRegion);
// Initial source pixel, taking source region and source
// subsamplimg offsets into account
sourceXOffset = srcRegion.x;
sourceYOffset = srcRegion.y;
pixelsToRead = destRegion.width * destRegion.height;
pixelsRead = 0;
processImageStarted(imageIndex);
processImageProgress(0.0f);
tilesAcross = (width + tileOrStripWidth - 1) / tileOrStripWidth;
tilesDown = (height + tileOrStripHeight - 1) / tileOrStripHeight;
int compression = getCompression();
// Attempt to get decompressor and color converted from the read param
TIFFColorConverter colorConverter = null;
if (imageReadParam instanceof TIFFImageReadParam) {
TIFFImageReadParam tparam = (TIFFImageReadParam) imageReadParam;
this.decompressor = tparam.getTIFFDecompressor();
colorConverter = tparam.getColorConverter();
}
// If we didn't find one, use a standard decompressor
if (this.decompressor == null) {
if (compression == BaselineTIFFTagSet.COMPRESSION_NONE) {
// Get the fillOrder field.
TIFFField fillOrderField = imageMetadata.getTIFFField(BaselineTIFFTagSet.TAG_FILL_ORDER);
// Set the decompressor based on the fill order.
if (fillOrderField != null && fillOrderField.getAsInt(0) == 2) {
this.decompressor = new TIFFLSBDecompressor();
} else {
this.decompressor = new TIFFNullDecompressor();
}
} else if (compression == BaselineTIFFTagSet.COMPRESSION_CCITT_T_6) {
this.decompressor = new TIFFFaxDecompressor();
} else if (compression == BaselineTIFFTagSet.COMPRESSION_CCITT_T_4) {
this.decompressor = new TIFFFaxDecompressor();
} else if (compression == BaselineTIFFTagSet.COMPRESSION_CCITT_RLE) {
this.decompressor = new TIFFFaxDecompressor();
} else if (compression == BaselineTIFFTagSet.COMPRESSION_PACKBITS) {
if (DEBUG) {
System.out.println("Using TIFFPackBitsDecompressor");
}
this.decompressor = new TIFFPackBitsDecompressor();
} else if (compression == BaselineTIFFTagSet.COMPRESSION_LZW) {
if (DEBUG) {
System.out.println("Using TIFFLZWDecompressor");
}
TIFFField predictorField = imageMetadata.getTIFFField(BaselineTIFFTagSet.TAG_PREDICTOR);
int predictor =
((predictorField == null)
? BaselineTIFFTagSet.PREDICTOR_NONE
: predictorField.getAsInt(0));
this.decompressor = new TIFFLZWDecompressor(predictor);
} else if (compression == BaselineTIFFTagSet.COMPRESSION_JPEG) {
this.decompressor = new TIFFJPEGDecompressor();
} else if (compression == BaselineTIFFTagSet.COMPRESSION_ZLIB
|| compression == BaselineTIFFTagSet.COMPRESSION_DEFLATE) {
TIFFField predictorField = imageMetadata.getTIFFField(BaselineTIFFTagSet.TAG_PREDICTOR);
int predictor =
((predictorField == null)
? BaselineTIFFTagSet.PREDICTOR_NONE
: predictorField.getAsInt(0));
this.decompressor = new TIFFDeflateDecompressor(predictor);
} else if (compression == BaselineTIFFTagSet.COMPRESSION_OLD_JPEG) {
TIFFField JPEGProcField = imageMetadata.getTIFFField(BaselineTIFFTagSet.TAG_JPEG_PROC);
if (JPEGProcField == null) {
processWarningOccurred(
"JPEGProc field missing; assuming baseline sequential JPEG process.");
} else if (JPEGProcField.getAsInt(0) != BaselineTIFFTagSet.JPEG_PROC_BASELINE) {
throw new IIOException(
"Old-style JPEG supported for baseline sequential JPEG process only!");
}
this.decompressor = new TIFFOldJPEGDecompressor();
// throw new IIOException("Old-style JPEG not supported!");
} else {
throw new IIOException("Unsupported compression type (tag number = " + compression + ")!");
}
if (photometricInterpretation == BaselineTIFFTagSet.PHOTOMETRIC_INTERPRETATION_Y_CB_CR
&& compression != BaselineTIFFTagSet.COMPRESSION_JPEG
&& compression != BaselineTIFFTagSet.COMPRESSION_OLD_JPEG) {
boolean convertYCbCrToRGB =
theImage.getColorModel().getColorSpace().getType() == ColorSpace.TYPE_RGB;
TIFFDecompressor wrappedDecompressor =
this.decompressor instanceof TIFFNullDecompressor ? null : this.decompressor;
this.decompressor = new TIFFYCbCrDecompressor(wrappedDecompressor, convertYCbCrToRGB);
}
}
if (DEBUG) {
System.out.println("\nDecompressor class = " + decompressor.getClass().getName() + "\n");
}
if (colorConverter == null) {
if (photometricInterpretation == BaselineTIFFTagSet.PHOTOMETRIC_INTERPRETATION_CIELAB
&& theImage.getColorModel().getColorSpace().getType() == ColorSpace.TYPE_RGB) {
colorConverter = new TIFFCIELabColorConverter();
} else if (photometricInterpretation == BaselineTIFFTagSet.PHOTOMETRIC_INTERPRETATION_Y_CB_CR
&& !(this.decompressor instanceof TIFFYCbCrDecompressor)
&& compression != BaselineTIFFTagSet.COMPRESSION_JPEG
&& compression != BaselineTIFFTagSet.COMPRESSION_OLD_JPEG) {
colorConverter = new TIFFYCbCrColorConverter(imageMetadata);
}
}
decompressor.setReader(this);
decompressor.setMetadata(imageMetadata);
decompressor.setImage(theImage);
decompressor.setPhotometricInterpretation(photometricInterpretation);
decompressor.setCompression(compression);
decompressor.setSamplesPerPixel(samplesPerPixel);
decompressor.setBitsPerSample(bitsPerSample);
decompressor.setSampleFormat(sampleFormat);
decompressor.setExtraSamples(extraSamples);
decompressor.setColorMap(colorMap);
decompressor.setColorConverter(colorConverter);
decompressor.setSourceXOffset(sourceXOffset);
decompressor.setSourceYOffset(sourceYOffset);
decompressor.setSubsampleX(srcXSubsampling);
decompressor.setSubsampleY(srcYSubsampling);
decompressor.setDstXOffset(dstXOffset);
decompressor.setDstYOffset(dstYOffset);
decompressor.setSourceBands(sourceBands);
decompressor.setDestinationBands(destinationBands);
// Compute bounds on the tile indices for this source region.
int minTileX = TIFFImageWriter.XToTileX(srcRegion.x, 0, tileOrStripWidth);
int minTileY = TIFFImageWriter.YToTileY(srcRegion.y, 0, tileOrStripHeight);
int maxTileX = TIFFImageWriter.XToTileX(srcRegion.x + srcRegion.width - 1, 0, tileOrStripWidth);
int maxTileY =
TIFFImageWriter.YToTileY(srcRegion.y + srcRegion.height - 1, 0, tileOrStripHeight);
boolean isAbortRequested = false;
if (planarConfiguration == BaselineTIFFTagSet.PLANAR_CONFIGURATION_PLANAR) {
decompressor.setPlanar(true);
int[] sb = new int[1];
int[] db = new int[1];
for (int tj = minTileY; tj <= maxTileY; tj++) {
for (int ti = minTileX; ti <= maxTileX; ti++) {
for (int band = 0; band < numBands; band++) {
sb[0] = sourceBands[band];
decompressor.setSourceBands(sb);
db[0] = destinationBands[band];
decompressor.setDestinationBands(db);
// XXX decompressor.beginDecoding();
// The method abortRequested() is synchronized
// so check it only once per loop just before
// doing any actual decoding.
if (abortRequested()) {
isAbortRequested = true;
break;
}
decodeTile(ti, tj, band);
}
if (isAbortRequested) break;
reportProgress();
}
if (isAbortRequested) break;
}
} else {
// XXX decompressor.beginDecoding();
for (int tj = minTileY; tj <= maxTileY; tj++) {
for (int ti = minTileX; ti <= maxTileX; ti++) {
// The method abortRequested() is synchronized
// so check it only once per loop just before
// doing any actual decoding.
if (abortRequested()) {
isAbortRequested = true;
break;
}
decodeTile(ti, tj, -1);
reportProgress();
}
if (isAbortRequested) break;
}
}
if (isAbortRequested) {
processReadAborted();
} else {
processImageComplete();
}
return theImage;
}
