public Iterator getImageTypes(int imageIndex) throws IIOException {
List l; // List of ImageTypeSpecifiers
Integer imageIndexInteger = new Integer(imageIndex);
if (imageTypeMap.containsKey(imageIndexInteger)) {
// Return the cached ITS List.
l = (List) imageTypeMap.get(imageIndexInteger);
} else {
// Create a new ITS List.
l = new ArrayList(1);
// Create the ITS and cache if for later use so that this method
// always returns an Iterator containing the same ITS objects.
seekToImage(imageIndex);
ImageTypeSpecifier itsRaw =
TIFFDecompressor.getRawImageTypeSpecifier(
photometricInterpretation,
compression,
samplesPerPixel,
bitsPerSample,
sampleFormat,
extraSamples,
colorMap);
// Check for an ICCProfile field.
TIFFField iccProfileField = imageMetadata.getTIFFField(BaselineTIFFTagSet.TAG_ICC_PROFILE);
// If an ICCProfile field is present change the ImageTypeSpecifier
// to use it if the data layout is component type.
if (iccProfileField != null && itsRaw.getColorModel() instanceof ComponentColorModel) {
// Create a ColorSpace from the profile.
byte[] iccProfileValue = iccProfileField.getAsBytes();
ICC_Profile iccProfile = ICC_Profile.getInstance(iccProfileValue);
ICC_ColorSpace iccColorSpace = new ICC_ColorSpace(iccProfile);
// Get the raw sample and color information.
ColorModel cmRaw = itsRaw.getColorModel();
ColorSpace csRaw = cmRaw.getColorSpace();
SampleModel smRaw = itsRaw.getSampleModel();
// Get the number of samples per pixel and the number
// of color components.
int numBands = smRaw.getNumBands();
int numComponents = iccColorSpace.getNumComponents();
// Replace the ColorModel with the ICC ColorModel if the
// numbers of samples and color components are amenable.
if (numBands == numComponents || numBands == numComponents + 1) {
// Set alpha flags.
boolean hasAlpha = numComponents != numBands;
boolean isAlphaPre = hasAlpha && cmRaw.isAlphaPremultiplied();
// Create a ColorModel of the same class and with
// the same transfer type.
ColorModel iccColorModel =
new ComponentColorModel(
iccColorSpace,
cmRaw.getComponentSize(),
hasAlpha,
isAlphaPre,
cmRaw.getTransparency(),
cmRaw.getTransferType());
// Prepend the ICC profile-based ITS to the List. The
// ColorModel and SampleModel are guaranteed to be
// compatible as the old and new ColorModels are both
// ComponentColorModels with the same transfer type
// and the same number of components.
l.add(new ImageTypeSpecifier(iccColorModel, smRaw));
// Append the raw ITS to the List if and only if its
// ColorSpace has the same type and number of components
// as the ICC ColorSpace.
if (csRaw.getType() == iccColorSpace.getType()
&& csRaw.getNumComponents() == iccColorSpace.getNumComponents()) {
l.add(itsRaw);
}
} else { // ICCProfile not compatible with SampleModel.
// Append the raw ITS to the List.
l.add(itsRaw);
}
} else { // No ICCProfile field or raw ColorModel not component.
// Append the raw ITS to the List.
l.add(itsRaw);
}
// Cache the ITS List.
imageTypeMap.put(imageIndexInteger, l);
}
return l.iterator();
}
